CN103269986A - Clarification tank, glass melting furnace, molten glass production method, glassware production method and glassware production device - Google Patents

Abstract

The purpose of the present invention is to provide a clarification tank provided with a first clarification tank, a second clarification tank and a cooling tank. The present invention pertains to a clarification tank provided with: a first clarification tank provided with a first molten glass flow channel partitioned off by a first bottom wall and first side walls disposed on both sides of the first bottom wall, a drain section provided in the bottom wall on the downstream side of the first molten glass flow channel, and a molten glass heating means, wherein the length of the first molten glass flow channel is greater than the height of the first side walls; a second clarification tank which is contiguous with the first clarification tank and is provided with a second molten glass flow channel partitioned off by a second bottom wall and second side walls disposed on both sides of the second bottom wall, wherein the shape of the flow channel is such that the molten glass achieves a uniflow state; and a cooling tank which is contiguous with the second clarification tank and is provided with a third molten glass flow channel partitioned off by a third bottom wall and third side walls disposed on both sides of the third bottom wall.

Description

The manufacturing installation of the manufacture method of clarifying tank, glass melting furnace, melten glass, the manufacture method of glasswork and glasswork

Technical field

The present invention relates to the manufacturing installation of the clarifying tank that possesses first clarifying tank, second clarifying tank and cooling tank for the manufacture of melten glass, the glass melting furnace that possesses this clarifying tank, glasswork, the manufacture method of melten glass of utilizing this clarifying tank and the manufacture method of glasswork.

Background technology

An example as the method for making sheet glass, known have a following described float glass process: use the glass manufacturing apparatus that possesses fusion tank, clarifying tank and building mortion, make frit fusion in fusion tank, with melten glass de-bubble in clarifying tank of gained, will bubble less and the melten glass of homogenization is sent to the building mortion that possesses float tin groove and forms sheet glass.

Be formed with the stream of melten glass in the clarifying tank that uses in this float glass process, this stream is made of the assembling of refractory materialss such as polylith refractory brick usually.

In addition, when in fusion tank, carrying out the fusion of frit, certainly lead to the gas that can in melten glass, form bubble during the material composition reaction, therefore must in clarifying tank, carry out the deaeration of melten glass, obtain steeping few high-quality melten glass, again this melten glass is sent to the building mortion of subsequent handling.

The clarification of the routine of melten glass is undertaken by chemical clarification, and the finings of Shi Yonging is added in the frit and in the introducing melten glass in advance for this reason.This finings is the multivalence oxide compound of reduction (being the finings oxygen loss) at high temperature etc., oxidized at low temperatures (being combined with oxygen).If the oxygen of being emitted by finings makes the bubble after bubble increases, grows up float molten glass level in melten glass, then broken bubble and deaeration.

In such background, as glass melting equipment, known have a glass melting apparatus that possesses clarifying tank and the structure of the groove that homogenizes that is connected with this clarifying tank, and this clarifying tank possesses the structure (with reference to patent documentation 1 and patent documentation 2) of the more shallow melten glass stream that batch raw materials melt is formed the fusion tank of melten glass, be connected with this fusion tank.

The prior art document

Patent documentation

Patent documentation 1: the Japanese Patent spy opens clear 61-132565 communique

Patent documentation 2: No. 6085551, U.S. Patent bulletin

Summary of the invention

Invent technical problem to be solved

In the glass melting furnace that possesses fusion tank and clarifying tank in the past, enter clarifying tank by the glass of melting furnace fusion, its part is returned fusion tank because of convection current.Carry out the clarification of glass during the circulation between this fusion tank and the clarifying tank is carried out, melten glass is clarified.Glass after this clarification flows into dirty forming process.

In this clarifying tank, the known clarifying tank that is called as the high temperature clear.In the clarifying tank of this high temperature clear, for efficient is carried out de-bubble well, operation in the following manner: will flow through temperature highland setting as far as possible under the condition that can not take place to foam again of the melten glass of clarifying tank, thereby reduce the viscosity of melten glass, accelerate the growth rate of bubble and bubble diameter is increased, improve the ascent rate of bubble thus, can realize de-bubble.

But in the ever-increasing glass of demand in recent years, the glass that demand is more high-quality wishes to develop the clarifying tank structure that can more effectively carry out the de-bubble of melten glass in the glass melting furnace that possesses fusion tank and clarifying tank.

In addition, carry out at the clarifying tank that uses the high temperature clear under the occasion of production of melten glass, the temperature that flows through the melten glass of clarifying tank is set in high temperature as far as possible, therefore naturally can the mass consumption energy.Require from current energy saving, wish to develop and not only satisfy de-bubble performance but also clarifying tank that can energy-conservation operation.

Moreover for carrying out the high temperature clarification, the resistivity against fire metal that common most of glass flows route platinum or platinum alloy etc. have the rare metal formation of resistivity against fire constitutes.Therefore, think about 20～50 tons of the maximum daily outputs of the clarifying tank that carries out high temperature clarification.Known to the inventor, the independent clarifying tank that surpasses the high temperature clarification usefulness of 100 tons of daily outputs does not at least still exist.Therefore, wish to develop the advantage that to develop the high temperature clarification, the technology that realizes low-cost or large-scale glass melting furnace.

In the high-melting-point melten glass manufacturing installation of patent documentation 2, in the zone of the clarification after frit is carried out fusion, be formed with the structure that is called as " refining groove (refining bank) ".Moreover in this " refining groove ", melten glass is heated by superposed burner.Therefore, think to be difficult to make jumbo melten glass, and energy saving is not high.

But the purpose of this invention is to provide for the efficient de-bubble well that realizes the demand, energy saving height, can be with the clarifying tank of low cost or Large scale construction.

In addition, the purpose of this invention is to provide the melten glass manufacture method that high-quality melten glass and glasswork can be provided and the manufacturing installation that possesses above-mentioned clarifying tank, the manufacture method that reaches glasswork.

The technical scheme that the technical solution problem adopts

The inventor furthers investigate, and the result has expected the clarifying tank structure that can achieve the above object, although this clarifying tank mainly utilizes refractory brick, high temperature clarification of still producing with the quality that can keep melten glass as described below is feature.Thus, can realize low cost or large-scale clarifying tank.

The invention provides a kind of clarifying tank, possess: first clarifying tank, this first clarifying tank possesses the first melten glass stream that is marked off by the first side wall portion of first bottom wall portion and both sides thereof, the discharge portion of being located at the bottom wall portion of this first melten glass stream downstream side, reaches the heating unit of melten glass, and the length of this first melten glass stream is greater than the height of this first side wall portion; Described first clarifying tank continuity that continues of second clarifying tank, this second clarifying tank arranges, and possesses the second melten glass stream that is marked off by second side wall portion of second bottom wall portion and both sides thereof, and has the stream shape that melten glass becomes the way flow state; And cooling tank, described second clarifying tank continuity that continues of this cooling tank arranges, and possesses the 3rd melten glass stream that is marked off by the 3rd side wall portion of the 3rd bottom wall portion and both sides thereof.

In the clarifying tank of the present invention, in the described second melten glass stream, with the width of the path direction quadrature of second bottom wall portion can be greater than the height of second side wall portion.

In the clarifying tank of the present invention, being preferably the described second melten glass stream shape sets in the mode that meets the following conditions: the Grashof number (Glashof number) of establishing the melten glass that flows through this stream is that Gr, Reynolds number (Reynolds number) are Re, then Gr/Re ²＜11420.

In the clarifying tank of the present invention, the heating unit that is preferably described first clarifying tank is many electrodes, in described second clarifying tank, described second bottom wall portion and two second interior melten glass streams of second side wall portion are refractory brick system, and are provided with face shield in the heating resisting metal system that coats this stream side refractory brick.

In the clarifying tank of the present invention, the heating unit that is preferably described first clarifying tank is burner, in described first and second clarifying tanks, described bottom wall portion and two interior melten glass streams of side wall portion are refractory brick system, and are provided with face shield in the heating resisting metal system that coats this stream side refractory brick.

In the clarifying tank of the present invention, the length of the described first melten glass stream can be 10～15m, and the length of the described second melten glass stream can be 4～14m, and the flow that flows through the melten glass stream can be 100～1000 tons/day.

In the clarifying tank of the present invention, at the upper reaches of described first melten glass stream end, can be formed with the first step portion higher than this first bottom wall portion.

In the clarifying tank of the present invention, at the upper reaches of described second melten glass stream end, can be formed with the second step portion higher than this second bottom wall portion.

In the clarifying tank of the present invention, at the downstream side of the described second melten glass stream, can be formed with first protuberance outstanding from the bight between second side wall portion and second bottom wall portion.

In the clarifying tank of the present invention, more by the position of upstream side, also can be formed with second protuberance of giving prominence to from the bight between second side wall portion and second bottom wall portion in the formation position of described first protuberance of ratio of the described second melten glass stream.

In the clarifying tank of the present invention, face shield can be made of a plurality of cover assemblies in described, these cover assemblies cover the molten glass flow trackside of described bottom wall portion and side wall portion, along described melten glass stream direction configuration, described cover assembly possesses the base wall panel that covers described bottom wall portion, the sidewall that covers described side wall portion and covering along first wrapper plate in the butt joint zone between the cover assembly of described flow arrangement.

In the clarifying tank of the present invention, can be provided with face shield in the heating resisting metal system that coats described the 3rd bottom wall portion and two interior molten glass flow tracksides of the 3rd side wall portion in the described cooling tank.

In the clarifying tank of the present invention, the described heating unit of being located in first clarifying tank can be made of the many electrodes that setting is arranged in described first clarifying tank, these electrodes dispose with the interval that the array mode separates regulation in length and breadth along melten glass stream direction, are the polyphase ac electrode listing many electrodes arranged side by side along one of described melten glass stream direction.

The present invention also provides a kind of glass melting furnace, has previous each described clarifying tank, possesses fusion tank at the flow upstream side of direction of the melten glass of this clarifying tank.

The present invention also provides a kind of manufacture method of melten glass, comprises following operation: use previous described glass melting furnace, made the operation of frit fusion by fusion tank; In first clarifying tank, the melten glass from this fusion tank is carried out hot defecation, discharge the operation of the heterogeneous base that produces first clarifying tank simultaneously from the bottom of the downstream side of this first clarifying tank; The operation of clarifying in the mode that flows into the way flow state of the melten glass of second clarifying tank; With the operation of the melten glass of deriving from second clarifying tank being cooled off by cooling tank.

In the manufacture method of melten glass of the present invention, the mode that described way flow state can meet the following conditions set the melten glass in the ingress of flow velocity, melten glass stream of melten glass and exit temperature variation, melten glass the degree of depth and get: the Grashof number of establishing melten glass is that Gr, Reynolds number are Re, then Gr/Re ²＜11420.

In the manufacture method of melten glass of the present invention, can be not the melten glass of described second clarifying tank not be heated.This means, as the OK range of second clarifying tank of the present invention, can not establish heater means.

In the manufacture method of melten glass of the present invention, the heating in described first clarifying tank is to flow through the mode that the temperature of the melten glass of described first clarifying tank meets the following conditions to carry out: the dirty distolateral temperature of described first clarifying tank reaches the highest.

The present invention also provides a kind of manufacture method of glasswork, comprising: the operation of previous described manufacturing melten glass, melten glass is cooled to the operation that melten glass is formed after its forming of glass temperature province and the operation that the glass after being shaped is annealed.

The present invention also provides a kind of manufacturing installation of glasswork, possesses: previous described glass melting furnace, the building mortion that the melten glass by this glass melting furnace manufacturing is formed and the annealing device that the glass after being shaped is annealed.

The invention effect

The present invention is by possessing the clarifying tank of first clarifying tank, second clarifying tank and cooling tank, bubble residual in first clarifying tank can be removed in second clarifying tank, can will use under the occasion of refractory brick stream processed the incidental heterogeneous base that enters the melten glass from the refractory brick stripping effectively discharge from the bottom of the downstream side of first clarifying tank under the clarification of the high temperature that in first clarifying tank, carries out, further de-bubble and keep the quality of melten glass.Wherein, first clarifying tank possesses the first melten glass stream that is marked off by the first side wall portion of first bottom wall portion and both sides thereof, the discharge portion of being located at the bottom wall portion of this first melten glass stream downstream side, reaches the heating unit of melten glass, and the length of this first melten glass stream is greater than the height of this first side wall portion; Described first clarifying tank continuity that continues of second clarifying tank arranges, and possesses the second melten glass stream that is marked off by second side wall portion of second bottom wall portion and both sides thereof, and has the stream shape that melten glass becomes the way flow state; Cooling tank described second clarifying tank continuity that continues arranges, and possesses the 3rd melten glass stream that is marked off by the 3rd side wall portion of the 3rd bottom wall portion and both sides thereof.In addition, by the present invention, clarifying tank is changed on a large scale, can be increased the heat of being brought into by melten glass, even it is also passable therefore heater means not to be set in second clarifying tank.Moreover, can not carry out clarifying treatment heatedly in second clarifying tank, therefore energy-conservation operation becomes possibility, can operate than the structure that second clarifying tank also possesses heater means more energy-conservationly.

Therefore the melten glass that flows through stream in second clarifying tank can be conducive to further de-bubble under the condition of de-bubble in the way flow state current downflow of the single direction from upstream side to downstream side.Specifically, because can be in way flow state current downflow, therefore do not have cycling stream, prevented that thus the melten glass of low temperature from returning the upstream side of high temperature, can avoid first clarifying tank is carried out reheat and the calorific loss that produces.

Heating unit with respect to first clarifying tank, second clarifying tank only arranges the melten glass stream, the melten glass stream of first and second clarifying tanks is refractory brick system, its refractory brick covers with the thermotolerance metal, by this, need not most of melten glass stream of first clarifying tank and second clarifying tank is mainly constituted with platinum or platinum alloy, therefore can realize low cost or large-scale glass melting furnace.

In being used in second clarifying tank, arrange under the occasion of the structure of face shield in the heating resisting metal system, even the melten glass of high temperature imports second clarifying tank and tries hard to realize under the occasion of high clarifying effect as far as possible in first clarifying tank, also the influence to the stove material that constitutes second clarifying tank is few, can evade the damage of stove material in second clarifying tank or the problems such as stripping of heterogeneous composition.

Use first clarifying tank of the present invention and second clarifying tank, in first clarifying tank, as far as possible carry out convective heating by heater means with reaching a high temperature, the discharge of the heterogeneous base that carries out de-bubble simultaneously and spill from refractory brick, in second clarifying tank, clarify down in flowing of single direction, owing to handle with this two-stage and to carry out the clarification of melten glass, energy-conservation operation that therefore can implementation efficiency de-bubble well.Therefore, few high-quality melten glass and the glasswork of the bubble that can provide inclusion-free to sneak into.

Description of drawings

Fig. 1 is the structure iron of an example of manufacturing installation that shows the glasswork of the clarifying tank possess first embodiment of the invention.

Fig. 2 is the diagrammatic top view that shows identical manufacturing installation major portion.

Fig. 3 shows the cross-section structure of second clarifying tank shown in Figure 1, so Fig. 3 (a) is drawing in side sectional elevation, and Fig. 3 (b) is that the part of identical clarifying tank enlarges sectional view.

Fig. 4 is the structure iron of an example that shows the interior face shield of the inside be disposed at identical clarifying tank.

Fig. 5 is the vertical view of an example that shows the interior face shield of the inside be disposed at identical clarifying tank.

Fig. 6 is the fragmentary cross-sectional view of an example that shows the interior face shield of the inside be disposed at identical clarifying tank.

Fig. 7 is the exploded perspective view of an example that shows the interior face shield of the inside be disposed at identical clarifying tank.

Fig. 8 is the schema of an example that shows the manufacturing process of glasswork of the present invention.

Fig. 9 is the structure iron of an example of manufacturing installation that shows the glasswork of the clarifying tank possess second embodiment of the invention.

Figure 10 is the diagrammatic top view that shows the manufacturing installation major portion of glasswork shown in Figure 9.

Figure 11 shows the example of the protuberance that the bottom wall portion of second clarifying tank in the manufacturing installation of glasswork shown in Figure 9 forms, therefore Figure 11 (A) is the stereographic map of first example of demonstration first protuberance, Figure 11 (B) is the stereographic map of second example of demonstration first protuberance, Figure 11 (C) is the stereographic map of the 3rd example of demonstration first protuberance, Figure 11 (D) is the stereographic map of the 4th example of demonstration first protuberance, Figure 11 (E) is the stereographic map of the example of demonstration first protuberance and second protuberance for the stereographic map of the 5th example of demonstration first protuberance, Figure 11 (F).

Figure 12 is the fragmentary cross-sectional view of second example that shows the interior face shield of the inside be disposed at identical clarifying tank.

Figure 13 is the front view of the 3rd example that shows the interior face shield of the inside be disposed at identical clarifying tank.

Figure 14 is the stereographic map of the 4th example that shows the interior face shield of the inside be disposed at identical clarifying tank.

Figure 15 is the structure iron of an example of manufacturing installation that shows the glasswork of the clarifying tank possess third embodiment of the invention.

Embodiment

Below, based on accompanying drawing the manufacture method of clarifying tank of the present invention, the glass melting furnace that possesses this clarifying tank and melten glass, the making method that reaches glasswork and an embodiment of manufacturing installation are described, but the present invention is not limit by following embodiment.In addition, the scale of each integrant is simply represented in the mode of easy grasp in the illustrated case among each figure shown below.

Fig. 1 is the structure iron of an embodiment of the medelling ground manufacturing installation that shows the melten glass that possesses clarifying tank of the present invention.Fig. 2 is the major portion vertical view of same apparatus.

First clarifying tank 3, second clarifying tank 4, cooling tank 5 and building mortion 6 that the manufacturing installation 1 of the glasswork of present embodiment possesses the fusion tank 2 that generates melten glass be used to making the frit fusion, sets gradually at the downstream side of this fusion tank 2.In the present embodiment, constitute the clarifying tank 7 of melten glass by first clarifying tank 3, second clarifying tank 4 and cooling tank 5, in addition, constitute glass melting furnace 14 by fusion tank 2 and fusion tank 7.

The fusion tank 2 of present embodiment is as arranging for the groove of making melten glass, the one side is provided with the throw-in part (not shown) of frit, its opposition side is provided with the connection section with first clarifying tank 3, and heating units such as use burner make the frit fusion that drops into from throw-in part and make melten glass.In addition, be located at fusion tank 2 burners and can be the burner that is horizontally installed in the sidewall of fusion tank 2 and sprays the form of combustion flame, also can be to be installed on the roof of fusion tank 2 downwards and the burner that sprays the form of combustion flame, also can use the granulation body and function burner for aerial scorification, this aerial scorification is the method that the mixed powder raw material that the frit powder forms with the mixed of stipulating is formed melten glass with the direct ejection of burner in high temperature gas phase atmosphere.Moreover, the device that fusion tank 2 can be to use electrode to switch on and heat.

First clarifying tank 3 that the fusion tank 2 of present embodiment connects is elongated overlooking down, the width almost fixed, have the length of the path direction of first clarifying tank 3 as shown in Figure 1 and Figure 2, namely the length of the first melten glass stream is greater than the structure of the height of the side wall portion of fusion tank, constituted by the 3b of the first side wall portion and the top 3c of the first bottom wall portion 3a and both sides thereof.That is to say that the clarifying tank of the what is called rising type (rising type) of the groove structure that the clarification that first clarifying tank of the present invention carries out is profound with possessing the bottom is different.The zone that is marked off by the 3b of the first side wall portion of the first bottom wall portion 3a of first clarifying tank 3 and both sides thereof is melten glass stream R1, in the mode that the two dot chain line GH of Fig. 1 becomes the liquid level position of melten glass, supplies with melten glass in first clarifying tank 3.On the first bottom wall portion 3a of first clarifying tank 3, erect with the interval of regulation many electrodes 8 are set, by to these electrodes 8,8 ... control energising amount can be heated to target temperature with melten glass.

In first clarifying tank 3, polylith refractory brick (refractory materials) is situated between by the convergence part connection and constitutes bottom wall portion 3a, side wall portion 3b and top 3c, constitutes the general shape of the groove of Fig. 1, shape shown in Figure 2 as a whole.Among Fig. 1 and Fig. 2, omit the thickness of having put down in writing the refractory brick that constitutes first clarifying tank 3, the profile of groove only is shown.Make the melten glass stream be mainly refractory brick system like this, can cut down the related cost of formation of melten glass stream.

Upper reaches at first clarifying tank 3 is distolateral, be the part of fusion tank 2 sides, be formed with the inlet side stage portion (being the 3d of first step portion) that exceeds a step than bottom wall portion 3a, in dirty distolateral, i.e. second clarifying tank, 4 sides of first clarifying tank 3, be formed with a plurality of discharge discharge portion 3e than the low step of bottom wall portion 3a at the width of first clarifying tank 3.First clarifying tank 3 is owing to be provided with this discharge portion 3e, become to melten glass under the occasion of heterogeneous base of melten glass even exist because of the moiety stripping that is warming up to high temperature refractory brick when processed for refractory brick, also can discharge this heterogeneous base, make and use this refractory brick to become possibility.

The introducing port of first clarifying tank 3 (being inlet portion) 3f forms than the other parts with corresponding first clarifying tank 3 of part that is formed with inlet side stage portion 3d shallowly.In addition, dirty distolateral Jie of first clarifying tank 3 is connected with second clarifying tank 4 by export mouth 3h, and this export mouth 3h is than by the part of the depth as shallow of the melten glass stream R of the upper end side that spaced walls 3g marked off, this spaced walls 3g of vertical uplift.

Described second clarifying tank 4 is elongated down overlooking, and the width almost fixed has the structure of the shallow groove of the ratio transverse width that becomes as shown in Figure 1 and Figure 2, is made of the second side wall portion 4b and the top 4c of the second bottom wall portion 4a and both sides thereof.The zone that is marked off by the second side wall portion 4b of the second bottom wall portion 4a of second clarifying tank 4 and both sides thereof is melten glass stream R2, in the mode that the two dot chain line GH of Fig. 1 becomes the liquid level position of melten glass, supplies with melten glass G in second clarifying tank 4.The stream of this second clarifying tank 3, namely in the first melten glass stream, with the width of the path direction quadrature of second bottom wall portion height greater than the side wall portion of fusion tank.

In addition, among Fig. 2, though the width of second clarifying tank fix, wideer than the width of first clarifying tank by the width that makes second clarifying tank, the degree of depth is more shallow, also can improve clarifying effect sometimes.

In second clarifying tank 4, polylith refractory brick is situated between and is connected and constituted bottom wall portion 4a, side wall portion 4b and top 4c by the convergence part, constitutes the general shape of Fig. 1, Fig. 2, groove shown in Figure 3 as a whole.Among Fig. 1 and Fig. 2, omit the thickness of having put down in writing the refractory brick (refractory materials) that constitutes second clarifying tank 4, the profile of groove only is shown, Fig. 3 has then depicted bottom wall portion 4a and side wall portion 4b as an example and has constituted the thickness of their refractory brick.

In addition, the size of refractory brick that constitutes bottom wall portion 4a and side wall portion 4b is random, can freely select corresponding to piece number and the size of the employed refractory brick of size of bottom wall portion 4a and side wall portion 4b.For example, can be the multilayered structure that the bottom wall portion 4a shown in Fig. 3 (a) and side wall portion 4b use polylith refractory brick.The refractory brick 4d of formation bottom wall portion 4a only is shown for simplified illustration in the structure shown in Figure 3, and the refractory brick 2 stacked examples on the short transverse of side wall portion 4b that constitute side wall portion 4b are shown.For example illustrated among Fig. 3 that bottom side at side wall portion 4b disposes the first refractory brick 4e, the structure of the stacked second refractory brick 4f on it.In addition, the outside (being dorsal part) of the refractory brick 4f of the upper end of formation side wall portion 4b is provided with water cold sleeve 50 among Fig. 3.The structure of water cold sleeve 50 is known features, so detailed, also omits detailed construction among Fig. 3 simultaneously.In addition, as an example of water cold sleeve 50, can adopt by constituting the structure that stream has water coolant to cool off in circulation stream, this circulation stream toward managing and returning pipe.

Upper reaches in second clarifying tank 4 is distolateral, i.e. the part of first clarifying tank, 3 sides, be formed with inlet side stage portion (the being second step portion) 4g than the high step of bottom wall portion 4a, the introducing port of second clarifying tank 4 (being inlet portion) 4h forms than the other parts of second clarifying tank 4 shallowly, and dirty distolateral bottom wall portion 4b Jie is linked to each other with cooling tank 5 by export mouth (the being export department) 4i that keeps constant depth in second clarifying tank 4.

Cooling tank 5 is elongated down overlooking, and the width almost fixed has the structure of the dark groove of the ratio that becomes as shown in Figure 1 second clarifying tank 4, is made of the 3rd side wall portion 5b and the top 5c of the 3rd bottom wall portion 5a and both sides thereof.The zone that the 3rd side wall portion 5b of the 3rd bottom wall portion 5a of groove 5 and both sides thereof of being cooled marks off is melten glass stream R3, in the mode that the two dot chain line GH of Fig. 1 becomes the liquid level position of melten glass, supplies with melten glass G in cooling tank 5.

The distolateral introducing port as melten glass in the upper reaches of cooling tank 5 (inlet portion) 5e is connected with the export mouth 4i of described second clarifying tank 4, dirty distolateral being formed with of cooling tank 5 discharged side stage portion 5d, its downstream side is connected with building mortion 6, melten glass G supplies with to building mortion 6 from export mouth (export department) 5f of the dirty end of stream R3, and wherein stream R3 is to form than discharging the shallow mode of side stage portion 5d.In addition, the whipping appts of cooling tank 5 private sides is located in 9 expressions of the symbol shown in Fig. 1.

In the cooling tank 5, polylith refractory brick (refractory materials) is situated between and is connected and constituted bottom wall portion 5a, side wall portion 5b and top 5c by the convergence part, constitutes the general shape of Fig. 1, groove shown in Figure 2 as a whole.Omit among Fig. 1 and Fig. 2 and put down in writing the thickness that constitutes the refractory brick of cooling tank 5, the profile of groove only is shown.

Be provided with interior face shield in second clarifying tank 4 and the cooling tank 5 in the clarifying tank 7 of present embodiment.The interior face shield 15 of being located at second clarifying tank 4 forms its height and width in the mode that can almost surround the stream R2 that is marked off by the bottom wall portion 4a of second clarifying tank 4 and side wall portion 4b, 4b, along the almost whole length setting of second clarifying tank 4.In addition, the interior face shield 15 of being located at cooling tank 5 forms its height and width in the mode of the stream R3 that the bottom wall portion 5a that can almost surround the groove 5 that is cooled and side wall portion 5b, 5b are marked off, along the almost whole length setting of cooling tank 5.By the refractory brick at the molten glass flow trackside of second clarifying tank 4 and cooling tank 5 interior face shield is set, can prevents from distributing from the one-tenth that becomes heterogeneous base of the refractory brick of second clarifying tank or cooling tank by move the higher melten glass of temperature that comes from first clarifying tank.

The interior face shield 15 of present embodiment constitutes a plurality of butts of length direction of a plurality of cover assembly 16 longshore current road R2, R3 specifically shown in the accompanying drawing after Fig. 4, is applicable to second clarifying tank 4 and cooling tank 5.In addition, the interior face shield 15 that is applicable to cooling tank 5 in the present embodiment has the structure identical with the interior face shield 15 that is applicable to second clarifying tank 4, therefore for the explanation of face shield 15 in described later, describe the interior face shield 15 of being located at second clarifying tank 4 in detail, and the interior face shield 15 of being located at cooling tank 5 is omitted its explanation.

Under the occasion of float glass board fabrication method, building mortion 6 bed 10(that the pond portion that is marked off by diapire 6a and perisporium 6b is provided with molten tin namely, hold the float glass bath (Japanese: フ ロ ー ト bath) of molten tin in the float glass manufacturing installation), melten glass G flow on this bed 10 and extend in the mode that can form tabular sheet glass.In addition, as building mortion, be not limited to float glass process, also can adopt the shaping of the plate glass that is undertaken by roll-in method, glass tube down-drawing etc., other the blow molding method etc. of manufacturing process, vial etc. of plate glass.

In the manufacturing installation 1 of present embodiment, in second clarifying tank 4, be provided with the interior face shield 15 for the protection of the internal surface of bottom wall portion 4a, side wall portion 4b, 4c as shown in Figure 3.The structure of face shield 15 specifically is shown in Fig. 4～Fig. 7 in being somebody's turn to do.For the interior face shield 15 of tackling aftermentioned when heating and the thermal dilation difference between the stove material, plate cut apart and the gap is set.In addition, in order to prevent that the out-of-date heterogeneous melten glass from the stove material of molten glass flow from from this Clearance Flow, arranging the structure that covers gap portion as described below.

The interior face shield 15 of present embodiment forms its height and width in the mode that can almost surround the stream R2 that is marked off by the bottom wall portion 4a of second clarifying tank 4 and side wall portion 4b, 4b, along the almost whole length setting of second clarifying tank 4.

Cover more than 16 butt of assembly and in constituting the state of face shield 15 be shown in Fig. 4, the vertical view structure of equal state is shown in Fig. 5, the Facad structure of equal state is shown in Fig. 6, the part decomposing state of the cover assembly 16 of a plurality of butts is shown in Fig. 7.

The cover assembly 16 of present embodiment based on go up at the width of second clarifying tank 4 direction of the flow direction quadrature of stream R2 (namely, with) in abutting connection with the first plate assembly 17 of configuration and the second plate assembly 18, and be disposed at their first cover plate 22 and second cover plates 23 and constituting on every side.

In the first plate assembly 17 and the second plate assembly 18, first cover plate 22 and second cover plate 23 any one is all whole by the Mo(molybdenum), Mo alloy, W(tungsten), the sheet material of the heating resisting metal system of W alloy etc. or Pt, PtRh alloy, other Pt alloy etc. constitutes.Particularly, by using Mo, W etc. as the comparatively cheap metal of heating resisting metal, can realize more low-cost or more massive glass melting furnace.The glass melting furnace of present embodiment is by using the heating resisting metal of the cheapness beyond Pt or the Pt alloy, can realize unprecedented daily output more than 50 tons, better more than 100 tons, glass melting furnace that also will be more than 500 tons.Among the present invention, can realize the glass melting furnace of at least 1000 tons of upper limits.Under the occasion of daily output more than 100 tons, the heat that melten glass is carried secretly is many, therefore can not use heating unit in second clarifying tank.For this day output, the length of the first melten glass stream (i.e. the length of the melten glass stream of first clarifying tank 3) is preferably 4～15m, more preferably 10～15m.In addition, the length of the second melten glass stream (i.e. the length of the melten glass stream of second clarifying tank 4) is preferably 2～15m, more preferably 4～14m.Moreover the length of cooling tank is preferably 4～20m, more preferably 10～20m.

In the clarifying tank of the present invention, by in first clarifying tank, the heterogeneous base that produces being discharged, is used the interior face shield of heating resisting metal system, even do not use the heating resisting metal of high price, also can realize the melten glass stove of the large-scale high temperature clear of scale different from the past as mentioned above.

The first plate assembly 17 is erect the first side wall plate 21 that arranges based on first base wall panel 20 with along the long limit of its width one side and is constituted, wherein first base wall panel 20 has the width of half left and right sides width (namely with about half of the width of the bottom wall portion 4a of the flow direction quadrature of stream R) of the bottom wall portion 4a that can cover second clarifying tank 4, is elongated rectangle at the flow direction of stream R2.

The second plate assembly 18 is erect second sidewall 26 that arranges based on second base wall panel 25 with along the long limit of width one side of this second base wall panel 25 and is constituted, wherein second base wall panel 25 has the width of half left and right sides width of the bottom wall portion 4a that can cover second clarifying tank 4, is elongated rectangle at the flow direction of stream R2.In addition, under the bigger occasion of the width of clarifying tank, can use the tabular base wall panel of appending.Under this occasion, also the gap between base wall panel arranges the plate that covers this gap.

In addition, also be provided with the covering first plate assembly 17,17 butt joint zone and the second plate assembly 18 of longshore current road R2 configuration, first cover plate 22 in 18 butt joint zone.This first cover plate 22 is made of the 3rd cover plate 22A of the L type that covers first base wall panel, 20 ends and the first side wall plate 21 ends, the 3rd cover plate 22B of L type that covers second base wall panel, 25 ends and second sidewall, 26 ends and the 4th cover plate 24 that covers described the 3rd cover plate 22A end.

Erect the part that arranges at the first side wall plate 21 of the upper surface long side of described first base wall panel 20 and add bar-shaped joint component 28, being situated between fixes base wall panel 20 and sidewall 21 by the shank 28 usefulness screws of opening cock.The material of this joint component 28 and screw can exemplify the Mo system.In addition, joint component 28 can the mode shorter slightly than the total length of the long side of first base wall panel 20 form, and the outside, two ends at the joint component 28 of first base wall panel 20 is formed with the bight 29 that joint component no longer extends.Joint component 28 then can be realized by the mode that step is set by bending machining or machining if form the structure in the gap between can wrapper plate.

In described the first side wall plate 21 and second sidewall 26 any one all forms with identical height.These sidewalls 21,26 modes that are positioned at the position lower than the liquid level position GH of the melten glass that flows through stream R2 with its upper end form.In other words, when melten glass G longshore current road R2 flowed, any one in the first side wall plate 21 and second sidewall 26 all formed their integral body and is melted the height that glass G covers.This be because, these sidewalls 21,26 are under situation about for example being formed by Mo, Mo is 500～600 ℃ of danger that have burning during time with the air state of contact, forming this structure is in order to prevent the generation of this situation.

Moreover, in the end side of the first side wall plate 21 that is positioned at downstream side along described stream R2 be positioned at the end side of second sidewall 26 of downstream side along described stream R2, be formed with the 21a of ear, the 26a that stretch out to the outside of stream R2 respectively, the 21a of this ear, 26a form the right angle with each sidewall 21,26 respectively.

Described the 3rd cover plate 22A is made of base plate 22a and the side plate 22b that a sheet bending forms, and forms the L font.The boundary member of the 3rd cover plate 22A and base plate 22a and side plate 22b matches and is situated between along 21 ends of the first side wall plate and is installed on the bight 29 that described joint component 28 end side form by setting tools such as rivet 30.In addition, the number of rivet, size can suitably determine according to the thickness of slab of cover plate etc.

Described setting tool 30 by with constitute plate assembly 17,18 heating resisting metal material identical materials constitutes.The position of being installed by setting tool can be the optional position, among Fig. 5 is 1 position only to be installed making on side plate 22b and the first side wall plate 21 position in opposite directions.For the installation site of setting tool 30, can connect and install the setting tool 30 of necessary number in the optional position of base plate 22a and side plate 22b according to each plate assembly 17,18 required assembling intensity etc.

The 3rd cover plate 22A is installed on the end side of the first side wall plate 21 in the following manner: the width of base plate 22a and side plate 22b is about half (namely, each plate width of the flow direction of longshore current road R2 half about) covers the ora terminalis part of first base wall panel 20 and the ora terminalis part of the first side wall plate 21, half remaining left and right sides width from the ora terminalis of first base wall panel 20 partly and the ora terminalis of the first side wall plate 21 partly stretch out.

Among the 3rd cover plate 22A, the length of the base plate 22a of longshore current road R2 width is longer slightly than the width along first base wall panel 20 of equidirectional, and the height of the side plate 22b of longshore current road R2 depth direction is identical with height along the first side wall plate 21 of same depth direction.

Described the 3rd cover plate 22B is made of base plate 22c and side plate 22d, forms the L font.The boundary member of the 3rd cover plate 22B and base plate 22c and side plate 22d matches and is arranged on the bonding part of second base wall panel 25 and second sidewall 26.

The words that are described in more detail, the 3rd cover plate 22B is situated between in the following manner and is installed on second sidewall 26 by setting tools such as rivet 30: its width covers the ora terminalis part of second base wall panel 25 and the ora terminalis part of second sidewall 26 about half, half remaining left and right sides width from the ora terminalis of second base wall panel 25 partly and the ora terminalis of second sidewall 26 partly stretch out.

The length of the base plate 22c of longshore current road R2 width is shorter slightly than the width along second base wall panel 25 of equidirectional, and the height of the side plate 22d of longshore current road R2 depth direction is identical with height along second sidewall 26 of same depth direction.

Described second cover plate 23 forms the elongated rectangle with the 3rd cover plate 22A, 22B same widths, its width covers the long side of first base wall panel 20 about half, stretches out and is situated between and is installed on first base wall panel 20 by setting tools such as rivet 31 from the long side of first base wall panel 20 about remaining half.The total length of the long side of second cover plate 23 is shorter slightly than the total length of the long side of first base wall panel 20, under the occasion that the 23a of a square end portion side that makes second cover plate 23 and described base plate 22a lateral margin match, the opposing party end 23a is configured in the position slightly to the inside, end than first base wall panel 20.Therefore, the end 20a that exposes not first base wall panel 20 that is covered by this second cover plate 23 in the outside of the end 23a of second cover plate 23.

Described the 4th cover plate 24 possesses down the tabular body 24a of square and is adjacent protuberance 24b, the 24c that formation is stretched out on both sides overlooking, and is made of the sheet material of L font.The 4th cover plate 24 is by constituting with described cover plate 22A, 22B, 23 identical heating resisting metal materials.The 4th cover plate 24 is with the bight that covers rectangular first base wall panel 20, namely the mode of the bonding part between the 3rd cover plate 22A and second cover plate 23 is situated between and is installed by setting tools such as rivets.The installation direction of the 4th cover plate 24 is: protuberance 24b is towards the width of stream R2 and leave the end of the 3rd cover plate 22A, and protuberance 24c is towards the flow direction downstream side of stream R2 and leave second cover plate 23.

Engaged and under the occasion of configuration configuration in the following manner as illustrated in fig. 5 by 4 plate assemblies 17,17,18,18 at the 4th cover plate 24: can be with engaging zones between the bight of to a certain degree width overlay masking base wall panel 20,20 and base wall panel 25,25 the bight.

More than Shuo Ming the first plate assembly 17 and the first plate assembly 18 dispose in the mode of adjacency about on the width of stream R2.The first plate assembly 17 and the first plate assembly 18 as shown in Figure 5 so that the long limit of the long limit of first base wall panel 20 and second base wall panel 25 is arranged on the bottom wall portion 4a of stream R2 in abutting connection with, the mode that separates clearance D 1 between them.

The major part of the clearance D 1 between the first plate assembly 17 and the first plate assembly 18 is covered by second cover plate 23 under overlooking.Further, make the protuberance 24b lift-launch of the 4th cover plate of installing on the first plate assembly 17 24 on the end of the base plate 22c of the 3rd cover plate 22B that is adjacent, the end of this base plate 22b is covered under overlooking.

Described clearance D 1 arranges in order to absorb dilation corresponding to the temperature of the melten glass G that flows through stream R2 in first base wall panel 20 and second base wall panel 25 under the occasion of thermal expansion on the width of stream R2.

Dispose the first plate assembly 17 and the second plate assembly 18 as described above and can constitute cover assembly 16, but also can overlook down gapless mode is covered the cover assembly 16 that is positioned at stream R2 downstream side by first cover plate 22 whole ora terminalis side, in other words, can overlook down gapless mode is covered the cover assembly 16 that is positioned at stream R2 downstream side by the 3rd cover plate 22A, 22B and the 4th cover plate 24 whole ora terminalis side.

Then, the flow direction of polylith cover assembly 16 longshore current road R2 such as Fig. 4 or as shown in Figure 5 with equidirectional configuration and connect face shield 15 in constituting.

More specifically, longshore current road R2 arranges the 3rd cover plate 22A, 22B and the 4th cover plate 24 in the ora terminalis part of any one cover assembly 16 downstream side, be arranged on than this cover assembly 16 and more also dispose with equidirectional by another piece cover assembly 16 of downstream side, the upstream side end edge portion that is configured in the cover assembly 16 of downstream side embeds the downstream side end edge portion of the cover assembly 16 that is configured in upstream side, thereby engages polylith cover assembly 16 configuration successively on the flow direction of stream R2 in this way.

Downstream side end edge portion at the cover assembly 16 of upstream side exists the 3rd cover plate 22A, 22B and the 4th cover plate 24, but between the bottom wall portion 4a of the 3rd cover plate 22A or 22B and stream R2, and the 4th cover plate 24 and side wall portion 4b between, be respectively equipped with the gap that is equivalent to a plate, therefore utilize these gaps and the downstream side end edge portion of the cover assembly 16 of upstream side is embedded the upstream side end edge portion of the cover assembly 16 of downstream side, both can be engaged and dispose.When cover assembly 16,16 engagings, form some clearance D 2 as shown in Figure 5 between the cover assembly 16 of upstream side and the cover assembly 16 of downstream side.That is to say, form clearance D 2 between first base wall panel 20 of first base wall panel 20 of the cover assembly 16 of upstream side and the cover assembly 16 of downstream side, form clearance D 2 between second base wall panel 25 of second base wall panel 25 of the cover assembly 16 of upstream side and the cover assembly 16 of downstream side.

These clearance D 2 are set are for absorbing first base wall panel 20 and the second base wall panel 25 thermal expansion part when flowing through the melten glass G thermal expansion of stream R2.

Below, in 16 tippings of a plurality of cover assemblies and in constituting under the occasion of face shield 15 in position between the side wall portion 4b of face shield 15 and formation stream R2 describe.

In constituting under the occasion of face shield 15, the base wall panel 20 of cover assembly 16,25 modes with the bottom wall portion 4a that covers stream R2 are arranged on the bottom wall portion 4a, and the sidewall 21 of cover assembly 16,26 modes with the side wall portion 4b that covers stream R2 arrange along side wall portion 4b.The 21a of ear, the 26a that stretch out cover assembly 16 outsides then insert the convergence part 4B of the seam of the refractory brick 4e that constitutes stream R2.

By this structure, can provide stable support by the first side wall plate 21 of side wall portion 4b and second sidewall 26.In addition, as the on position of the 21a of ear, 26a, also can not adopt the convergence part 4B of refractory brick 4e, slit 4s is set and the 21a of ear, 26a be inserted this slit 4s and the structure that supported but adopt in the stream R2 of refractory brick 4e side.

In addition, side wall portion 21,26 for support cover assembly 16, also can adopt following structure for example shown in Figure 5: the bolt shape setting tool (supporting tool) 35 that heating resisting metal systems such as Mo or W are set in the mode that connects refractory brick 4e, make this setting tool 35 connect sidewalls 21,26 necessary part and fix, thus the sidewall 21 of support cover assembly 16,26 structure separately.

The moulding product such as vial that the glasswork that uses the glass manufacturing apparatus 1 of present embodiment and make be the sheet glass made by float glass process, roll-in method, glass tube down-drawing etc., made by blow moulding etc. etc. get final product, and are unrestricted on composition.Therefore, can be soda-lime glass, mix in alkali-containing glass, pyrex or the non-alkali glass any.In addition, the purposes of the glasswork of manufacturing is not limited to for building or vehicle usefulness, can enumerate the various uses that flat-panel monitor is used, reached other.

Under the occasion of the soda-lime glass that is used for for building or for motor vehicle sheet glass, represent preferably have following composition: SiO with the quality percentage of oxide compound benchmark ₂: 65～75%, Al ₂O ₃: 0～3%, CaO:5～15%, MgO:0～15%, Na ₂O:10～20%, K ₂O:0～3%, Li ₂O:0～5%, Fe ₂O ₃: 0～3%, TiO ₂: 0～5%, CeO ₂: 0～3%, BaO:0～5%, SrO:0～5%, B ₂O ₃: 0～5%, ZnO:0～5%, ZrO ₂: 0～5%, SnO ₂: 0～3%, SO ₃: 0～0.5%.

Under the occasion of the non-alkali glass that is used for the substrate that liquid-crystal display or OLED display use, represent preferably have following composition: SiO with the quality percentage of oxide compound benchmark ₂: 39～75%, Al ₂O ₃: 3～27%, B ₂O ₃: 0～20%, MgO:0～13%, CaO:0～17%, SrO:0～20%, BaO:0～30%.

Under the occasion of the mixing alkali-containing glass that is used for the substrate that plasma display uses, represent preferably have following composition: SiO with the quality percentage of oxide compound benchmark ₂: 50～75%, Al ₂O ₃: 0～15%, MgO+CaO+SrO+BaO+ZnO:6～24%, Na ₂O+K ₂O:6～24%.

Under the occasion that is used for learning as the thermally resistant container of other purposes or physics and chemistry with the pyrex of utensil etc., represent preferably have following composition: SiO with the quality percentage of oxide compound benchmark ₂: 60～85%, Al ₂O ₃: 0～5%, B ₂O ₃: 5～20%, Na ₂O+K ₂O:2～10%.

The example of stream R2 of the interior face shield 15 of said structure being located at second clarifying tank 4 is as follows: earlier as shown in Figure 7 with first base wall panel 20, the first side wall plate 21, the 3rd cover plate 22A and the 4th cover plate 24 riveted and fixed, assemble as the first plate assembly 17 under state shown in Figure 7 again.In addition, second base wall panel 25, second sidewall 26 and the 3rd cover plate 22B riveted and fixed are assembled as the second plate assembly 18 under the state shown in Figure 7.

These first plate assemblies 17 and the second plate assembly 18 are prepared a plurality of, according to direction alignment shown in Figure 7, they are close to as shown in Figure 4 and Figure 5 along the stream R2 of second clarifying tank 4 lay and overlapping, by this can enough cover assemblies 16 cover successively to flow R2.

In addition, thereby refractory brick 4e Jie who is used for the side wall portion 4b of formation second clarifying tank at polylith is engaged by convergence part 4B under the occasion that makes up side wall portion 4b, each 21a of ear, 26a that covers assembly 16 makes up second clarifying tank 4 when inserting convergence part 4B, can carry out the structure of second clarifying tank 4 and the structure of interior face shield 15 simultaneously by this.

In addition, also identical in cooling tank 5, the first plate assembly 17 and the second plate assembly 18 are prepared a plurality of, according to direction alignment shown in Figure 7, they are close to as shown in Figure 4 and Figure 5 along the stream R3 of cooling tank 5 successively lay and overlapping, can cover stream R3 by enough inner face covers 15 by this.

Above-mentioned explanation all is to be close to successively towards cover plate 22 and to lay and be disposed at the explanation that the structure of the downstream side of stream R2, R3 is carried out at covering assembly 16,16, is close to laying successively and to be disposed at the structure of upstream side of stream R2, R3 also passable but will cover assembly 16,16 towards cover plate 22.The configuration direction of cover assembly 16 is not limited among the present invention.

Below, the manufacture method of the glasswork of the manufacturing installation 1 that uses glasswork is described, the manufacturing installation 1 of this glasswork comprise possess previously described in second clarifying tank 4 and the cooling tank 5 of face shield 15.

In the manufacturing installation 1 of present embodiment, frit fusion in fusion tank 2 and generate melten glass G, adopt the method that this melten glass G is circulated in fusion tank 2 etc. to carry out to a certain degree de-bubble after, it is moved to first clarifying tank 3.The operation that makes the frit fusion in the fusion tank 2 and form melten glass is called glass melting operation S1 as shown in Figure 8.

In first clarifying tank 3, by using electrode 8 heating of switching on, the temperature of melten glass is adjusted to the high temperature of 1420～1510 ℃ of left and right sides scopes, clarify.By remaining on the high-temperature area of this scope, the effect of contained finings waits to make bubble growth to carry out de-bubble in the composition by melten glass G.In addition, by being heated to the high temperature of this scope, the viscosity degradation of melten glass G, therefore bubble is also grown up easily, also come-up and removing easily.

Under the occasion to above-mentioned many electrodes 8 energising heating, as an example, as shown in Figure 2, overlook following 12 electrodes 8 and be disposed at first clarifying tank 3 with 6 * 2 mode proper alignment that are listed as, under this occasion, three-phase alternating current energising can followingly be carried out: to select R phase, T phase mutually three-phase to be switched on successively with S in pairs to (pair) shown in the arrow between the electrode 8 of the adjacency of oblique line shown in the arrow.In addition, other example of the energising heating carried out of these electrodes 8 is described in detail in the aftermentioned embodiment.

Under the occasion to above-mentioned many electrodes 8 energisings, be present in around the electrode 8 and heated melten glass G is heated to than the higher high temperature of melten glass G around it, the melten glass that is heated to higher temperature upwards flows along electrode 8, the convection current that produces melten glass G around electrode 8, therefore the inside of first clarifying tank 3 generates the semiconvection of melten glass G.Generate the part cycling stream of melten glass G thus at the private side of first clarifying tank 3.So, be in the position of the export mouth 3h side of first clarifying tank 3 in these cycling streams, become near the melten glass G of liquid level GH side centered by and be sent to second clarifying tank, 4 sides.In addition, efficient is carried out de-bubble well as described later in order not heat in second clarifying tank 4, and the preferred so that mode of the temperature the highest (namely, being up to Da Wendu) of the melten glass G of the export mouth 3h side of first clarifying tank 3 heats successively with many electrodes 8.

Here, for example, the temperature of melten glass G is set under 1420～1510 ℃ the occasion of scope in first clarifying tank 3, and the mode that the preferred so that temperature of the melten glass G of export mouth 3h side reaches 1510 ℃ of top temperatures is to the control of switching on of each electrode 8.

In addition, in the present embodiment, it is to contain SO about 0.2 quality % as finings in soda-lime glass that the ceiling temperature (being up to Da Wendu) of the export mouth 3h side of melten glass G in first clarifying tank 3 is set at 1510 ℃ ₃The occasion of melten glass G under an example, containing the SO that is less than 0.2 quality % ₃Occasion under, can to set ground higher with the Da Wendu that is up to of export mouth 3h side, at the SO that contains more than 0.2 quality % ₃Occasion under, can to set ground lower with the Da Wendu that is up to of export mouth 3h side.So, being up to of export mouth 3h side reaches temperature and can suitably set according to the composition of employed melten glass G in first clarifying tank 3, but under any circumstance, all preferred temperature high as far as possible under the temperature that can not take place to foam again.Carry out so temperature controlled reason and be for after second clarifying tank 4 in melten glass G is not actively heated, but when melten glass G being produced flow from it effluent to carry out de-bubble to the way flow state of downstream side, carry out de-bubble as far as possible swimmingly.

After in first clarifying tank 3, having carried out de-bubble to a certain degree, in second clarifying tank 4, import melten glass and carry out further clarifying treatment de-bubble.

When melten glass moves to second clarifying tank 4 from first clarifying tank 3, has the degree of depth to a certain degree in first clarifying tank 3, and with many electrifying electrodes 8 heating, therefore the convection current that partly produces melten glass G, but second clarifying tank 4 is more shallow, and melten glass G is not heated basically, therefore the backflow that does not produce melten glass basically, but produce the fixing mobile (way flow state namely) and making melten glass be moved to cooling tank 5 sides to export mouth 4i side (downstream side) along second clarifying tank 4 from its introducing port 4h side (upstream side).

Below the way flow state is described.As the reason that in the stream of second clarifying tank, hinders way flow, can enumerate the generation of the natural convection that the temperature head by upstream side and downstream side produces.Specifically, the upstream side of high temperature generates upwelling, and the downstream side of low temperature generates katabatic drainage, therefore can produce the natural convection of Return-ing direction in the bottom.In the intensity of this natural convection of strength ratio of melten glass main flow enough under the big situation, produce the different but way flow that flow towards single direction of flow velocity along the depth direction of melten glass.And in the intensity of melten glass main flow unlike the intensity of natural convection enough under the big situation, can produce in the bottom and main flow is reverse flows.

Usually, the strength ratio of the intensity of natural convection and forced convection is with the ratio Gr/Re of Grashof number Gr and reynolds number Re square ², be buoyancy and mass force recently the expression.Therefore, the way flow parameter that adopts this ratio to produce as way flow.In design during second clarifying tank, set the temperature variation of the melten glass in the ingress of the flow velocity of melten glass, melten glass stream and exit, the degree of depth of melten glass by utilizing this way flow parameter, can realize the way flow state.

By generating into flowing of this way flow state, bubble residual in first clarifying tank 3 can be not produce the effectively de-bubble of mode quilt of the molten glass flow that returns first clarifying tank 3 in second clarifying tank 4.

In addition, the ratio Gr/Re of the Grashof number Gr that produces this way flow state and reynolds number Re square ²Scope below 11420 for well, can form strong way flow below 6500, therefore better.

For this scope, following trying to achieve: because the simple shape of second clarifying tank, it is considered as hexahedral 3D shape, utilize the rerum natura of soda-lime glass commonly used, by carrying out conventional three-dimensional thermal convection analysis, 51 calculating that single stream parameter is changed with poor, the mean flow rate of melten glass of the medial temperature of the melten glass of the medial temperature of the melten glass of clarifying tank entrance and outlet, this three of the degree of depth of clarifying tank as parameter in 370 to 40148 scope.

In addition, for the kinetic viscosity of melten glass, calculate as the function with the temperature variation of melten glass.In addition, realize that the way flow state is not limited to aforesaid method, also available other method is set.

The temperature of second clarifying tank 4 is about 1510 ℃ in introducing port 4h side, is about 1500 ℃ at outlet side, can promote the clarification of melten glass by this pyroprocessing.That is, make bubble in the melten glass G grow up swimmingly and float, the broken bubble at liquid level position GH place and by de-bubble.

Be provided with in this second clarifying tank 4 described in face shield 15, the action effect that face shield 15 produces in therefore can obtaining, action effect after elaborate.

Melten glass in second clarifying tank 4 after the de-bubble in cooling tank 5 so that the mode that this melten glass can be shaped is cooled to its forming temperature zone.More specifically, described melten glass is cooled to the temperature of about 1200 ℃ of outlet sides from the temperature of about 1500 ℃ of its inlet sides in described cooling tank 5.Be provided with whipping appts 9 in the cooling tank 5, by when stir promoting cooling, refrigerating unit such as water cooling tube be set as required can promote cooling.

The operation of in the present embodiment, clarifying in first clarifying tank 3 and second clarifying tank 4, melten glass being cooled off in the mode that can make its shaping and adjust to its forming temperature zone is called clarification operation S2 as shown in Figure 8.

For example, under the occasion of float glass board fabrication method, the melten glass that is cooled in cooling tank 5 about 1200 ℃ can extend by the bed 10 in molten tin in the building mortion 6 of subsequent handling, becomes plate glass through cooling again.The operation of using building mortion 6 in the present embodiment and plate glass being shaped is called forming process S3 as shown in Figure 8.

Then, carry out as shown in Figure 8 plate glass is annealed to annealing operation S4 near the temperature of normal temperature, by implementing to cut into the cutting action S5 of target size, can obtain target glass goods G6 as shown in Figure 8.

In the manufacturing process of above glasswork G6, in the present embodiment, the temperature of the melten glass G that the energising heating of being undertaken by many electrodes 8 in first clarifying tank 3 produces is temperature high as far as possible under the temperature of the degree that can not take place to foam again, for example, the outlet side of first clarifying tank 3 is heated to about 1510 ℃.As an example of temperature distribution in first clarifying tank 3, can be that the mode that reaches 1420 ℃ of inlet sides, 1510 ℃ of outlet sides slowly to rise to high temperature from inlet side to outlet side is come with electrode 8 heating.

In second clarifying tank 4, melten glass G mobile in second clarifying tank 4 is in the way flow state that longshore current road R2 flows towards single direction, the melten glass G that moves to second clarifying tank 4 is 1500～1510 ℃ high temperature, therefore, the melten glass G of high temperature can efficient carry out de-bubble more well under the way flow state, as a result, the melten glass G after the efficient de-bubble can be delivered to cooling tank 5 afterwards.

In addition, in the present embodiment, be provided with the interior face shield 15 of heating resisting metal system in second clarifying tank 4 and the cooling tank 5.

Face shield 15 covers the bottom wall portion 4a of the stream R2 that constitutes melten glass G and the inner face side of side wall portion 4b in second clarifying tank 4, therefore it is few that direct between the refractory brick that constitutes bottom wall portion 4a and side wall portion 4b and the melten glass G contacts, and can suppress heterogeneous composition from refractory brick in the stripping of melten glass G side.

Face shield 15 covers the bottom wall portion 5a of the stream R3 that constitutes melten glass G and the inner face side of side wall portion 5b in the cooling tank 5, therefore it is few that direct between the refractory brick that constitutes bottom wall portion 5a and side wall portion 5b and the melten glass G contacts, and can suppress heterogeneous composition from refractory brick in the stripping of melten glass G side.

Therefore, even carry out in long-time continuous under the occasion of clarification of melten glass G, also can be in the manufacturing of carrying out melten glass G from the not stripping of heterogeneous composition of refractory brick under the situation of the melten glass G that flows through stream R2, R3.Thereby, the high-quality melten glass G that forms homogeneous can be delivered to next operation, be shaped and obtain high quality glass products G6 through building mortion 6.

In addition, as required, the operation that the melten glass after being shaped is ground can be set, make the glasswork of surface through grinding.

But, for the stream R2, the R3 that possess face shield 15 in the Mo system in second clarifying tank 4 and the cooling tank 5, when the production of melten glass begins, flow through under the occasion of melten glass G for the first time, there is air in these grooves, when face shield 15 is heated to more than 500～600 ℃ therefore, face shield 15 burnings in must preventing.

The burning of face shield 15 preferably is formed with the coating that prevents that Mo from contacting with air on the whole surface of interior face shield 15 in when preventing this production beginning.As this coating, for example can adopt silicon oxide to film.Silicon oxide film if when melten glass production begins in melten glass G covers till face shield 15 integral body during in prevent the reaction of Mo and air, so be covered with the thickness that has the degree of enough weather resistance during till face shield 15 integral body in melten glass G covering.After face shield 15 integral body, silicon oxide is filmed and is passed through and consume in time in melten glass G covers, therefore, the melten glass G that covers interior face shield 15 afterwards with interior face shield 15 from air insulated.

Action effect to the interior face shield 15 of present embodiment is described further below.

Cover as mentioned above in the interior face shield 15 of stream R2, R3 inner face, between first base wall panel 20 and second base wall panel 25, be formed with clearance D 1, between the cover assembly 16,16 of adjacency before and after the flow direction of stream R2, be formed with clearance D 2.

The coefficient of thermal expansion of the interior face shields 15 of heating resisting metal system such as coefficient of thermal expansion and Mo of refractory brick 4e that constitutes the base wall panel 4a of stream R2 and side wall portion 4b is different.Flow through at melten glass G under the occasion of stream R2, R3, each plate of face shield 15 refractory brick 4e more less than coefficient of thermal expansion ground that expands is more in constituting.Here, because the private side of interior face shield 15 is provided with clearance D 1, D2, the thermal expansion part of each plate of face shield 15 can be absorbed by clearance D 1, D2 in therefore constituting, and can make the interior face shield 15 that is in heated condition because of melten glass G not be applied in useless thermal stresses.Therefore, even use continuously second clarifying tank 4, the cooling tank 5 that possess interior face shield 15 to make melten glass, interior face shield 15 is not subjected to the effect of useless load such as thermal stresses yet.

In addition, convergence part 4B or slit 4s by the 21a of ear, 26a with the cover assembly 16 of present embodiment insert refractory brick 4e around it can obtain following action effect.

When melten glass G longshore current road R flows, in flowing through, melten glass G in the stream R2 of face shield 15 inner face side, also have a small amount of melten glass G to flow into the bottom wall portion 4a of stream R2 and the gap portion between side wall portion 4b and interior face shield 15 rear side.

Here, face shield 15 in constituting, the surface of bottom wall portion 4a that covers stream R2 and the surface of side wall portion 4b even a plurality of cover assembly 16 engages, the bottom surface of the interior face shield 15 on the stream R2 internal surface and side driving fit fully.Moreover the sidewall 21 of interior face shield 15,26 upper end are positioned at the position lower than the liquid level GH of melten glass, and have clearance D 1, D2 in the interior face shield 15, therefore also have some melten glass G to return the dorsal part that flows into interior face shield 15.

Flow into the bottom wall portion 4a of stream R2 and side wall portion 4b and directly contact bottom wall portion 4a and side wall portion with melten glass G between the interior face shield 15, therefore contact with the refractory brick that constitutes bottom wall portion 4a and side wall portion 4b, corrode refractory brick through long-time running, a part that constitutes the composition of refractory brick might be polluted melten glass in the stripping of melten glass side.But, the amount that flows into the melten glass G between bottom wall portion 4a and side wall portion 4b and interior face shield 15 rear side is few for the main flow of the melten glass that flows through stream R2 private side, and, the melten glass of face shield 15 rear side is difficult for returning in stream R2 side in flowing into, and the contaminated melten glass of face shield 15 dorsal parts reduces the possibility that the melten glass G of the stream R2 that flows through inner face cover 15 inboards exerts an influence in therefore existing only in.

In addition, according to occasion, the flow direction that flows into the melten glass G meeting longshore current road R2 between bottom wall portion 4a and side wall portion 4b and interior face shield 15 rear side moves.But, on the length direction of interior face shield 15, have the 21a of many places ear, 26a off and on, so the liquid of melten glass G when moving to stream R2 downstream side from interior face shield 15 rear side fails to be convened for lack of a quorum and is blocked by the 21a of ear, 26a.As a result, the melten glass G of interior face shield 15 rear side that contact side wall portion 4b and contaminated possibility is high can not be sent to the downstream side of stream R2.

Therefore, contaminated melten glass can not be sent in the building mortion 6 that is located at second clarifying tank 4 and cooling tank 5 downstream sides, has that the high-quality melten glass of few bubble that the homogeneous that inclusion-free can be entered forms is delivered to building mortion 6 and the effect that makes it to be shaped.

In addition, considering in temperature following about 1200 ℃ in view of the zone of face shield 15 in the arranging of explanation hereto never produces from the angle of the stripping of the heterogeneous material of refractory brick, better is that the zone that the melten glass temperature reaches more than 1200 ℃ is arranged interior face shield 15.By coating this zone with interior face shield 15, can prevent the heterogeneous composition stripping from refractory brick.

Fig. 9 shows is the example of manufacturing installation of glasswork that possesses the clarifying tank of second embodiment of the invention, and Figure 10 shows is to possess the manufacturing installation major portion of glasswork of identical clarifying tank from overlooking down an example of the state of seeing.

The manufacturing installation 55 of the glasswork of present embodiment possesses the glass melting furnace 56 with fusion tank 2 and clarifying tank 57.Clarifying tank 57 in the glass melting furnace 56 has and the roughly the same structure of clarifying tank 7 of first embodiment before.In the clarifying tank 57 of present embodiment, with respect to the first previous embodiment, be disposed at the configuration of electrode 8 of first clarifying tank 3 with different to the switch-on regime of these many electrodes 8, be provided with on the second discharge portion 3i this point also differently at the bottom wall portion 3a of first clarifying tank 3, also be provided with on the first protuberance 4j this point also different in the export mouth 4i of second clarifying tank 4 side.

In first clarifying tank 3 of present embodiment, increase the discharge portion 3e that is located at stream R1 export mouth 3h side (dirty distolateral) bottom, also formed discharge portion 3i in introducing port 3f side (upstream side) in addition.This discharge portion 3i is identical with before discharge portion 3e, and interval a plurality of (under the state shown in Figure 10 the being four) proper alignment that separates regulation at the width of first clarifying tank 3 forms.

In the structure of present embodiment, the electrode 8 that is arranged in first clarifying tank 3 amounts to 12 configurations with 43 row.Wherein, arranged 3 * 3 row between introducing port 3f and the discharge portion 3i and amounted to 9 electrode 8, remaining 3 electrodes 8 are disposed between discharge portion 3i and the discharge portion 3e.In addition, the radical of electrode changes according to the melten glass amount of fusion or the width of clarifying tank etc., can suitably set.

In second embodiment, as shown in figure 10, overlook down with in 4 12 electrodes 8 that totally 3 row are arranged of every row, 4 electrodes 8 of each row of longshore current road R1 length direction proper alignment are followed successively by from introducing port 3f side: first electrode 8 is R phase electrode for T phase electrode, the 3rd electrode 8 for S phase electrode, the 4th electrode 8 for R phase electrode, second electrode 8.

In addition, in the present embodiment, as shown in figure 10, overlook down with in 4 12 electrodes 8 that totally 3 row are arranged of every row, 4 electrodes 8 of each row of longshore current road R1 length direction proper alignment also can be followed successively by from introducing port 3f side: first electrode 8 is R phase electrode for S phase electrode, the 3rd electrode 8 for T phase electrode, the 4th electrode 8 for R phase electrode, second electrode 8.

Figure 10 is up and down in the configuration of the three-phase electrode of 2 demonstrations, with the phase differential between adjacent electrode be 120 the degree the mode combining and configuring, specifically be so that (first clarifying tank, 3 upstream sides namely) are followed successively by the three-phase electrode distributing style of the arranged in order of R phase, S/T phase, S/T phase, R phase from the left side, this configuration is compared with the three-phase electrode configuration that is followed successively by R phase, S phase, T phase, R phase configuration from the left side, can reduce the current density that is applied to melten glass G surface and make it homogenization.

In addition, if shown in Figure 10 with from the left side so that the phase differential between adjacent electrode is the modes three-phase electrode configuration of the arranged in order of combining and configuring R phase, S/T phase, S/T phase, R phase successively of 120 degree, then compare with the three-phase electrode configuration that is followed successively by R phase, S phase, T phase, R phase configuration from the left side, can make the current density that is applied to melten glass G surface in the electrode 8 is than low value.For current density, can suitably determine according to the melten glass temperature in the amount of the melten glass of manufacturing or the required fusion tank.

For how disposing R phase, S phase, T in the configuration of electrode shown in Figure 10 8 could under the few state of electrode 8 consumption, the energising heating study mutually, found that, shown in Figure 10 from the three phase diagram left side successively with electrode between under the occasion of phase place with the three-phase electrode configuration of the arranged in order of R-S phase, T-S phase, T-R phase, can reduce the current density of the 2nd electrode surface area that is listed as.Can reduce current density and mean, under the occasion of the glass melting furnace of long-time continuous running, the consumption of electrode tails off being assumed to be the production melten glass.

In addition, calculated current densities for 6 * 2 electrode array that are listed as of structure shown in Figure 2.Consequently, the averaging circuit density under the occasion of switching on as the X type arrow of 4 paired electrodes of first clarifying tank, 3 upstream sides is, with arrow S ₁Be expressed as 0.69A/cm between electrode ², with arrow S ₂Be expressed as 0.62A/cm between electrode ², with arrow S ₃Be expressed as 0.66A/cm between electrode ², with arrow S ₄Be expressed as 0.64A/cm between electrode ², being expressed as between electrode with arrow S5 is 0.92A/cm ², with arrow S ₆Be expressed as 0.67A/cm between electrode ²

From this result as can be known, under the electrode array of Fig. 2, produced 0.92A/cm ²The electrode of high current density, therefore for the structure of the electrode array of Figure 10 comparatively unfavorable aspect the current densities.

In the said structure, be provided with discharge portion 3e, 3i in electrode 8 front and back of the export mouth 3h of first clarifying tank 3 side, if in electrode 8 front and back discharge portion 3e, 3i are set, then can suppress to result from the upwelling of these electrodes 8 melten glass on every side.By this, be stranded at the low melten glass G of temperature under the occasion of export mouth 3h bottom side of first clarifying tank 3 and have following effect: even the melten glass G of this delay comprises the heterogeneous composition from the stove material, this contaminated melten glass G can not delivered to second clarifying tank, 4 sides yet, but it can be discharged from discharge portion 3e, 3i.

Below, in the clarifying tank 57 of second embodiment, in the width both end sides of the export mouth 4i side (dirty distolateral) of the bottom wall portion 4a of second clarifying tank 4, form the first protuberance 4j in the mode of joining with side wall portion 4b.

As first example, longshore current road R2 is elongated rectangular shape (bulk) in this first protuberance 4j such as Figure 11 (A) bottom wall portion 4a that is shown in dirty distolateral, with the width about the part of the width that accounts for stream R2, account for the height formation about the part of the degree of depth (the liquid level GH of melten glass namely) of the melten glass G that flows through stream R2.In addition, Figure 11 (A) is the three-dimensional sketch in longitudinal section that the stream R3 of the stream R2 of second clarifying tank 4 and cooling tank 5 is cut along its flow path width direction central authorities, has shown the zone of stream R2, the only about half of width of R3.The position of following Figure 11 (B)～(F) midship section observation is also identical.

For the first protuberance 4j, also can be the first protuberance 4k with the rectangular shape shown in the Figure 11 (B) that forms than the wide slightly mode of shape shown in Figure 11 (A), can be the first protuberance 4l of the wideer rectangular shape of width shown in Figure 11 (C), can also be the first block protuberance 4m of roughly square shown in Figure 11 (D).In addition, can also be the first protuberance 4n that the derivation oral-lateral at bottom wall portion 4a (dirty distolateral) longshore current road R2 shown in Figure 11 (E) accounts for its whole width.Perhaps, it can also be the structure shown in Figure 11 (F), namely, except the first protuberance 4p of the width both end sides of the export mouth 4i side of being located at bottom wall portion 4a of rectangular shape, at the second protuberance 4r that rectangular shape more is set in the mode of joining with side wall portion 4b by the position of introducing port 4h side (upstream side) than the formation position of the first protuberance 4p.

For above-mentioned first protuberance 4j～4p and the second protuberance 4r, contain the growth and float and the mode that suppresses to steep the bottom side that moves to melten glass G arranges easily of this bubble under the occasion of bubble with melten glass G inside mobile in the stream R2 of second clarifying tank 4,

That is, the melten glass G that is heated to top temperature in first clarifying tank 3 of the export mouth 3h side of first clarifying tank 3 is keeping inflow second clarifying tank 4 under the situation of this temperature.In second clarifying tank 4, melten glass G is without heating but flow with the direction shown in the arrow F of Figure 11 (A) to relief outlet 4i side with way flow state longshore current road R3.At this moment, flow through the area side that contacts with the side wall portion 4b of second clarifying tank 4, be that the melten glass G of the width both end sides of stream R2 has been captured more heats by side wall portion 4b that therefore the melten glass G than the central part side that flows through stream R2 lowers the temperature quickly.That is to say, the melten glass G of the width both end sides of the stream R2 temperature that becomes is lower, the result, the melten glass G that produces low temperature in the width both end sides of stream R2 sinks to the downwelling of lower side from this zone upper side, by this downward flowing, move to the bottom side of melten glass G steeping oneself-meeting of being removed of liquid level side.

Produce sinking as mentioned above if flow through the melten glass G of the width both end sides of stream R2, then should floating, the bubble of disappearance might be moved to cooling tank 5 sides in situation about not disappearing to liquid level and through breaking bubble.In order to suppress this phenomenon, above-mentioned first protuberance 4j～4p and the second protuberance 4r are set.

If at dirty distolateral these first protuberance 4j～4p and the second protuberance 4r of arranging of bottom wall portion 4a, then contact with these protuberances and flow along forming liquid upwards in the liquid stream of the liquid stream of protuberance side face circuitous direction in the encirclement mode and a part of melten glass G at the melten glass G of way flow state.The result, even the melten glass G that sinks can be drawn onto bubble its bottom side, this bubble also can move to the liquid level side along the liquid stream that makes progress, therefore can produce and make bubble move near the liquid stream of cooling tank 5 liquid levels, can make bubble emersion liquid level by this and broken bubble, so can reduce the contained bubble of melten glass G of cooling tank 5.In addition, low at the flow velocity of the liquid stream that produces around the circuitous direction of protuberance, thereby produce the opportunity that bubble rises thus, and bubble becomes and rises and the emersion liquid level easily, and the result can de-bubble.

In addition, the second protuberance 4r role shown in Figure 11 (F) is to make the liquid stream of the melten glass G in the stream R2 way circuitous, suppresses the sinking of bubble.Therefore, can combine with the effect that the first protuberance 4p is set to promote the come-up of steeping to prevent the sinking of steeping.For this reason, also can adopt optional position in stream R2 way that the structure of the second protuberance 4r beyond first protuberance 4j～4p is set.

As shown in the above, for described first protuberance 4j～4r, sinking for the bubble of the width both end sides that in second clarifying tank 4, effectively prevents its stream R2, make liquid stream circuitous and reduce flow velocity, bottom wall portion 4a dirty distolateral, form in the mode of joining with side wall portion 4b in the width both end sides of bottom wall portion 4a at least.Therefore, whole width at bottom wall portion 4a can the first protuberance 4n shown in Figure 11 (E) forms protuberance, in addition, though not shown, first protuberance 4j～4m of shape shown in Figure 11 (A)～Figure 11 (D) also can form a plurality of on the width of the dirty distolateral bottom wall portion 4a of second clarifying tank 4 off and on.

Figure 12 is the sectional view that shows the structure of an example under the occasion that the mode that stretches out upward with the liquid level position GH from melten glass G the upper end of the Mo sidewall 21 processed of cover assembly in the interior face shield be applicable to clarifying tank of the present invention disposes.

Under the occasion that the mode that the sidewall 21 processed of Mo as this embodiment stretches out upward with the liquid level position GH from melten glass G disposes, so that the mode that sidewall 21 does not contact with air is first cover plate 51 in the outside of inverted u-shaped and the upper end that the second inboard cover plate 52 covers sidewalls 21 by the transverse section.

First cover plate 51 in the outside is made of heating resisting metal materials such as Pt alloy, iridium such as Pt, PtRh, and the second inboard cover plate 52 is by aluminum oxide (Al ₂O ₃), heat-stable ceramic such as zirconium white constitutes.

Even first cover plate 51 in the outside is not to be subject to melten glass G erosion to contact heating resisting metal system also out of question with air, and the reason of second cover plate 52 of the heat-stable ceramic system of setting is, form under the occasion of silica coatings at cover assembly 16 when melten glass G begins to flow after clarifying tank 4 makes up, Pt can be impaired if silica coating contacts with Pt, therefore second cover plate 52 is set to prevent this damage.In addition, consider from this viewpoint, wish that the position of lower edge 51a of first cover plate 51 in the outside more forms by the position of top with the bottom 52a than second cover plate 52 of inboard, and the bottom 51a of first cover plate 51 leaves about sidewall 21 surperficial tens mm.

By adopting structure shown in Figure 12, Mo sidewall 21 processed, 26 upper end position can be arranged on than the liquid level position GH of melten glass G more by the position of top.Adopt this structure, can coat the side wall portion 4b that constitutes stream R2 with bigger scope by enough inner face covers 15.By this, can till above the liquid level position GH of melten glass G, all dispose the first side wall plate 21, so near the liquid level GH of melten glass G, can realize direct contacting structure of melten glass G and refractory brick 4f.In addition, though the mode that changes up and down with the liquid level position GH of melten glass G operate glass manufacturing installation 1, use clarifying tank 4, the not structure of easy damaged of sidewall 21,26 also can be provided.Therefore that is to say that even the liquid level position GH change of the height level of first cover plate 51, melten glass G, sidewall 21,26 does not contact with air yet, even if sidewall 21,26 does not hinder for Mo system liquid level position GH change yet.

In addition, can prevent impurity from refractory brick 4e, the stripping of 4f side near the melten glass G the liquid level position GH, so impurity can not sneaked among near the liquid level position GH the melten glass G yet.

Figure 13 has shown and has been applicable to that the end side of first base wall panel 20 and second base wall panel 25 in the cover assembly 16 of the present invention also is provided with the example of the 20c of ear, 25c.Other structure is identical with the structure of before first embodiment.

End side in first base wall panel 20 as this embodiment arranges the 20c of ear downwards, end side in second base wall panel 25 arranges the 25c of ear downwards, they all insert convergence part or the slit 4s of the refractory brick 4c that constitutes bottom wall portion 4a, by this first base wall panel 20 and second base wall panel 25 are arranged on the bottom wall portion 4a of clarifying tank 4.

In the structure of this example, the end side of first base wall panel 20 and second base wall panel 25 is formed with the 20c of ear, 25c, therefore the liquid stream that can longshore current road R2 flows through the melten glass G of the gap area between first base wall panel 20 and second base wall panel 25 and the stream R2 bottom wall portion 4a is blocked by the 20c of ear, 25c, can stop melten glass G mobile from described gap area to stream R2 downstream side.

Form the 20c of ear, 25c by the end side in first base wall panel 20 and second base wall panel 25, can not make contaminated melten glass G flow to the downstream side of clarifying tank 4.

Therefore, identical with the structure of before first embodiment, adopt the structure of this example can provide the contaminated melten glass G of the gap portion between the side wall portion 4b and cover assembly 16 not only not flow to the structure that downstream side but also bottom wall portion 4a and the contaminated melten glass G that covers the gap portion between the assembly 16 do not flow to downstream side yet.

Figure 14 has shown the example of the cover assembly 16A that is applicable to interior face shield 15 involved in the present invention, this example is with the difference of the structure of first embodiment before, with first base wall panel 20 and second base wall panel, 25 integrated and shared base wall panel 60 of separating in first embodiment before.In addition, with the first plate assembly 17 and the second plate assembly, the 18 integrated and shared plate assemblies 61 that separate in first embodiment before.Moreover, with the 3rd cover plate 22A that separates in first embodiment before, the cover plate 62 that the integrated and shared section shape of 22B is the U font, omit the 4th cover plate 24.Described cover plate 62 forms the U font that is made of base plate 62a and side plate 62b.

In the structure of this example, cover with half left and right sides width in the end edge portion side of base wall panel 60 at the base plate 62a of cover plate 62 and under the state that half remaining left and right sides width stretches out, cover plate 62 to be fixed on the ora terminalis part of covering assembly 16A with omitting the setting tools such as rivet that show among the figure.In addition, cover the first side wall plate 21 with half left and right sides width and the remaining end edge portion side that half left and right sides width stretches out, the other side side plate 62b covers second sidewall 26 with half left and right sides width and under the state that half remaining left and right sides width stretches out, cover plate 62 is fixed on the ora terminalis part of covering assembly 16A with omitting the setting tools such as rivet that show among the figure at one side of cover plate 62 side plate 62b.In addition, base wall panel 60 and sidewall 21,26 are formed by a heating resisting metal panel bending.

Interior face shield 15A by this example also can be from bottom wall portion 4a and side wall portion 4b, the 4b protection melten glass G of stream R2.So the assimilation effect of cover assembly 16A, the 16A thermal expansion part when the length direction of stream R2 expands can be identical with the structure of before first embodiment.That is to say, utilization in the gap between the base wall panel 60,60 of adjacency on the flow direction of stream R2 and the gap between the sidewall 21,21, the gap between the sidewall 26,26, can access the assimilation effect of cover assembly 16A, the 16A thermal expansion part during thermal expansion on the length direction of stream R2.

In addition, the interior face shield 15A of this example shares a plate with the first plate assembly 17 of adjacency on the width of stream R2 and the second plate assembly 18, therefore can't obtain covering the assimilation effect of assembly 16A when the width of stream R2 expands, but sidewall 21,26 is not the side wall portion 4b driving fit with stream R2, but separate the certain interval configuration, therefore under the occasion of making the structure that need not to consider the thermal expansion that takes place to the width of stream R2, can use structure shown in Figure 14.

For example, as shown in Figure 6, coming under the occasion of support-side wallboard 26 with the mode that the connects refractory brick 4e bolt shape setting tool (supporting tool) 35 with heating resisting metal systems such as Mo, can easily between sidewall 26 and refractory brick 4e, 4f, the gap be set, therefore can utilize this gap to absorb the thermal expansion part.In addition, under this occasion, need not setting tool 35 is securely fixed on the sidewall 26, but so that sidewall 26 can setting tool 35 axially on mobile a little mode engage for well.Certainly, if the convergence part 4B that the 26a of ear of sidewall 26 is supported in refractory brick 4e then can not have problems on the structural strength of sidewall 26 yet.

Figure 15 is the structure iron of an example of manufacturing installation that shows the glasswork of the clarifying tank possess third embodiment of the invention.

The manufacturing installation 80 of the glasswork of present embodiment possesses the glass melting furnace 90 with fusion tank 2 and clarifying tank 97.Clarifying tank 97 in the glass melting furnace 90 has the structure identical with the clarifying tank 7 of first embodiment before.

The clarifying tank 97 of present embodiment is with respect to the difference of the clarifying tank 7 of first embodiment before, as the heating unit of being located at first clarifying tank 3, adopt a plurality of oxygen burners 91 of the side wall portion 3b that is horizontally set at first clarifying tank 3 to replace electrode 8.Under this occasion, the refractory metal metal sheet processed of covering stream side refractory brick can be set to the stream of refractory brick system.As the setting of the interior face shield of this metal sheet with aforementioned identical.

In first clarifying tank 3, for the temperature that makes melten glass G for obtaining the temperature of clarifying effect, replace electrode 8 that a plurality of oxygen burners 91 are set and produce combustion flame 92, by their radiant heat melten glass G is heated to target temperature.

In order in first clarifying tank 3, to produce the convection current of melten glass G, also can adopt the structure that many electrodes 8 also are set beyond oxygen burner 91.

In the glass melting furnace 90 of the 3rd embodiment, also can carry out the two-stage de-bubble by first clarifying tank 3 and second clarifying tank 4 in the same manner with the clarifying tank 7 of first embodiment before, the few melten glass G of bubble can be delivered to building mortion 6 and makes glasswork.

The present invention is not particularly limited fusion tank, but also can be by adopting aerial scorification (as a reference, for example the Japanese Patent spy opens 2006-199549 number) fusion tank make the melten glass fusion, this aerial scorification be with the frit powder with the mixed powder raw material that forms of mixed of regulation from directly ejection and the gas phase atmosphere of high temperature, become the method for melten glass of burner.

This is because adopt aerial scorification, frit powder fusion under gas phase atmosphere, so the amount of moisture in the melten glass is more than employing electrofuse or the common fusion of carrying out with burner, can improve the clarifying effect under the high temperature of the present invention.

In addition, adopt the words of aerial scorification, though the difference that the amount of moisture in the melten glass is formed according to glass, the manufacture method of frit particle change, by (Japanese: red outer light splitting シ Application グ Le バ Application De method) mensuration is obtained amount of moisture at least more than 600ppm to the absorbancy of the light of wavelength 2.75～2.95 μ m by infrared spectroscopy single band method.Under the occasion of this amount of moisture and electrofuse under the occasion of 400～600ppm or the common fusion of carrying out with burner 300ppm compare and obviously want high.The higher limit of amount of moisture for example can exemplify about 20000ppm in may be as the scope that contains water in conjunction with water in the melten glass.In order further to improve clarifying effect of the present invention, amount of moisture is better more than 900ppm.

Among the present invention, the amount of moisture in the glass is tried to achieve by infrared spectroscopy single band method, and the β that the maximum value β max of its absorbancy obtains divided by the thickness (mm) of sample-OH value is 0.33mm under the occasion of 600ppm ^-1About, be 0.165mm under the occasion of 300ppm ^-1About.

Utilize possibility on the industry

Technology of the present invention can be widely used in the manufacturing of glass for building purposes, vehicle glass, optics glass, medical glass, display unit glass, solar power generation or solar thermal power generation cover glass, other conventional glasswork.

In addition, quote the full content of Japanese patent application 2010-293999 specification sheets, claims, accompanying drawing and the summary of filing an application on December 28th, 2010 here as announcement of the present invention.

Nomenclature

R1, R2, R3 ... stream, G ... melten glass, GH ... the liquid level position of melten glass, 1 ... manufacturing installation, 2 ... fusion tank, 3 ... first clarifying tank, 3a ... first bottom wall portion, 3b ... the first side wall portion, 3d ... inlet side stage portion (first step portion), 3e ... discharge portion, 3f ... introducing port, 3h ... export mouth, 3i ... discharge portion, 4 ... second clarifying tank, 4a ... second bottom wall portion, 4b ... second side wall portion, 4d, 4e, 4f ... refractory brick (refractory materials), 4g ... inlet side stage portion (second step portion), 4h ... introducing port, 4i ... export mouth, 4j, 4k, 4l, 4m, 4n, 4p ... first protuberance, 4r ... second protuberance, 4s ... slit, 5 ... cooling tank, 5a ... the 3rd bottom wall portion, 5b ... the 3rd side wall portion, 5e ... introducing port, 5f ... export mouth, 6 ... building mortion, 7,57,97 ... clarifying tank, 8 ... electrode, 14,56,90 ... glass melting furnace, 15 ... interior face shield, 16 ... the cover assembly, 17 ... the first plate assembly, 18 ... the second plate assembly, 20 ... first base wall panel, 20c ... ear, 21 ... the first side wall plate, 21a ... ear, 22 ... first cover plate, 22A, 22B ... the 3rd cover plate, 23 ... second cover plate, 24 ... the 4th cover plate, 25 ... second base wall panel, 25c ... ear, 26 ... second sidewall, 26a ... ear, 30,31,32 ... slit, S1 ... the glass melting operation, S2 ... the clarification operation, S3 ... forming process, S4 ... annealing operation, S5 ... cutting action, G6 ... glasswork, 51 ... first cover plate, 52 ... second cover plate, 15A ... interior face shield, 16A ... the cover assembly, 60 ... base wall panel, 62 ... cover plate, 91 ... the oxygen burner.

Claims (20)

1. clarifying tank possesses:

First clarifying tank, this first clarifying tank possesses the first melten glass stream that is marked off by the first side wall portion of first bottom wall portion and both sides thereof, the discharge portion of being located at the bottom wall portion of this first melten glass stream downstream side, reaches the heating unit of melten glass, and the length of this first melten glass stream is greater than the height of this first side wall portion;

Described first clarifying tank continuity that continues of second clarifying tank, this second clarifying tank arranges, and possesses the second melten glass stream that is marked off by second side wall portion of second bottom wall portion and both sides thereof, and has the stream shape that melten glass becomes the way flow state; With

Described second clarifying tank continuity that continues of cooling tank, this cooling tank arranges, and possesses the 3rd melten glass stream that is marked off by the 3rd side wall portion of the 3rd bottom wall portion and both sides thereof.

2. clarifying tank as claimed in claim 1 is characterized in that, in the described second melten glass stream, with the width of the path direction quadrature of second bottom wall portion height greater than second side wall portion.

3. clarifying tank as claimed in claim 1 or 2 is characterized in that, the described second melten glass stream shape is set in the mode that meets the following conditions: the Grashof number of establishing the melten glass that flows through this stream is that Gr, Reynolds number are Re, then Gr/Re ²＜11420.

4. as each described clarifying tank in the claim 1～3, it is characterized in that, the heating unit of described first clarifying tank is many electrodes, in described second clarifying tank, described second bottom wall portion and two second interior melten glass streams of second side wall portion are refractory brick system, and are provided with face shield in the heating resisting metal system that coats this stream side refractory brick.

5. as each described clarifying tank in the claim 1～3, it is characterized in that, the heating unit of described first clarifying tank is burner, in described first and second clarifying tanks, described bottom wall portion and two interior melten glass streams of side wall portion are refractory brick system, and are provided with face shield in the heating resisting metal system that coats this stream side refractory brick.

6. as each described clarifying tank in the claim 1～5, it is characterized in that the length of the described first melten glass stream is 10～15m, the length of the described second melten glass stream is 4～14m, and the flow that flows through the melten glass stream is 100～1000 tons/day.

7. as each described clarifying tank in the claim 1～6, it is characterized in that, at the upper reaches of described first melten glass stream end, be formed with the first step portion higher than this first bottom wall portion.

8. as each described clarifying tank in the claim 1～7, it is characterized in that, at the upper reaches of described second melten glass stream end, be formed with the second step portion higher than this second bottom wall portion.

9. as each described clarifying tank in the claim 1～8, it is characterized in that, at the downstream side of the described second melten glass stream, be formed with first protuberance outstanding from the bight between second side wall portion and second bottom wall portion.

10. clarifying tank as claimed in claim 9, it is characterized in that, more by the position of upstream side, also be formed with second protuberance of giving prominence to from the bight between second side wall portion and second bottom wall portion in the formation position of described first protuberance of ratio of the described second melten glass stream.

11. as claim 4 or 5 described clarifying tanks, it is characterized in that, face shield is made of a plurality of cover assemblies in described, these cover assemblies cover the molten glass flow trackside of described bottom wall portion and side wall portion, along described melten glass stream direction configuration, described cover assembly possesses the base wall panel that covers described bottom wall portion, the sidewall that covers described side wall portion and covering along first wrapper plate in the butt joint zone between the cover assembly of described flow arrangement.

12. as each described clarifying tank in the claim 1～11, it is characterized in that, be provided with face shield in the heating resisting metal system that coats described the 3rd bottom wall portion and two interior molten glass flow tracksides of the 3rd side wall portion in the described cooling tank.

13. as each described clarifying tank in the claim 1～12, it is characterized in that, the described heating unit of being located in first clarifying tank is made of the many electrodes that setting is arranged in described first clarifying tank, these electrodes dispose with the interval that the array mode separates regulation in length and breadth along melten glass stream direction, are the polyphase ac electrode listing many electrodes arranged side by side along one of described melten glass stream direction.

14. glass melting furnace has each described clarifying tank in the claim 1～13, possesses fusion tank at the flow upstream side of direction of the melten glass of this clarifying tank.

15. the manufacture method of melten glass comprises following operation:

Right to use requires 14 described glass melting furnaces, is made the operation of frit fusion by fusion tank;

In first clarifying tank, the melten glass from described fusion tank is carried out hot defecation, discharge the operation of the heterogeneous base that produces first clarifying tank simultaneously from the bottom of the downstream side of this first clarifying tank;

The operation of clarifying in the mode that flows into the way flow state of the melten glass of second clarifying tank; With

The operation of the melten glass of deriving from second clarifying tank being cooled off by cooling tank.

16. the manufacture method of melten glass as claimed in claim 15, it is characterized in that, described way flow state set in the mode that meets the following conditions the melten glass in the ingress of flow velocity, melten glass stream of melten glass and exit temperature variation, melten glass the degree of depth and get: the Grashof number of establishing melten glass is that Gr, Reynolds number are Re, then Gr/Re ²＜11420.

17. the manufacture method as claim 15 or 16 described melten glass is characterized in that the melten glass to described second clarifying tank does not heat.

18. the manufacture method as each described melten glass in the claim 15～17, it is characterized in that the heating in described first clarifying tank is to flow through the mode that the temperature of the melten glass of described first clarifying tank meets the following conditions to carry out: the dirty distolateral temperature of described first clarifying tank is than the distolateral temperature height in the upper reaches of this first clarifying tank.

19. the manufacture method of glasswork comprises: the operation of each described manufacturing melten glass in the claim 15～18, melten glass is cooled to the operation that melten glass is formed after its forming of glass temperature province and the operation that the glass after being shaped is annealed.

20. the manufacturing installation of glasswork possesses: the described glass melting furnace of claim 14, the building mortion that the melten glass by this glass melting furnace manufacturing is formed and the annealing device that the glass after being shaped is annealed.

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