ES2854279T3 - Improved gas burner - Google Patents

Abstract

Gas burner with at least two flame rings, consisting of: - an injector holder (6) provided with a single vertical injector (22) centrally located at the base of said injector holder (6), - a flame divider ( 4) with an outer chamber (26) of generally annular development, and an inner chamber (28) of generally circular development, between which an annular cavity (29) is interposed, - a cover (8), and in said burner of gas: - said flame divider (4) comprises in its lower part supporting means (30, 23) of said flame divider on said nozzle holder (6, 12) and its connection with it, - the inner circular chamber (28) of said flame divider (4) comprises a single substantially vertical channel (46) facing said single vertical injector (22) of said injector holder (6), said substantially vertical conduit (46) opening into a radial effect chamber (47) Venturi defined in said inner chamber (28) of the flame divider (4) and limited by a r above the central discoidal portion (54) of said cover (8), - said flame divider (4) comprises at least one substantially radial channel (36) for fluid connection between said inner circular chamber (28) and said annular chamber exterior (26), said radial channel (36) being closed at the top by a corresponding radial part (56) of said cover (8), - said at least two rings of flames comprising a first ring of flames, generated in the holes ( 42, 43) provided in the outer wall (32) of said outer annular chamber (26) of the flame divider (4) and at least one second ring of flames that can be generated in the holes (42, 43) provided in the wall inside (34) of said outer annular chamber (26) of the flame divider (4), or in the holes (42, 43) provided in the side wall (35) of said inner chamber (28) of the flame divider (4 ) or in the holes (42, 43) provided both in the inner wall (34) of said outer annular chamber (26) and on said side wall (35) of said inner circular chamber (28). - said cover (8) is made of a single piece and comprises a central discoidal portion (54), which closes above said inner circular chamber (28), and an annular portion (52) which closes above said outer annular chamber ( 26), - said substantially vertical channel (46) facing said single vertical injector (22) is defined within a tubular conduit (30) extending downwardly from the inner chamber (28) of the flame divider (4), and characterized in that: - said injector holder (6, 12) has the shape of a plate and is provided with openings (13) for the entry of primary air below a cooking plate (10) in which said burner is to be installed , and because said support means (30, 23) comprise said tubular conduit (30), which is hermetically inserted into said plate-shaped injector holder (6, 12).

Description

DESCRIPTION

Improved gas burner

[0001] The present invention relates to an improved gas burner.

[0002] Single control gas burners with multiple concentric flame rings are known, that is, burners in which the gas supply is controlled by a single tap. These generally comprise an injector holder cup, a flame divider supported on the injector holder cup and formed by two parts joined together to define an inner central chamber and an outer annular chamber, a discoidal cover that borders on the upper part with the central chamber of the flame divider, and an annular cover that borders the annular chamber of the flame divider at the top.

[0003] Therefore, known gas burners with multiple concentric rings are made up of a total of five elements assembled together, their production cost being, therefore, quite high.

[0004] One of these known burners is described, for example, in document EP 797048, comprising five elements: a lower cup-shaped support, an intermediate cylindrical element, a head comprising an inner circular chamber and an annular chamber exterior, and two closing covers for said chambers.

[0005] In order to reduce the cost of production and reduce their assembly complexity, gas burners with multiple flame rings, made up of four or three elements, have been proposed.

[0006] For example, document EP 2572141 describes a gas burner with multiple flame rings comprising an injector holder and a flame divider defining an outer annular chamber and an inner circular chamber, both closed at the top by means of a single deck. The injector holder comprises two cup-shaped supports and two vertical injectors located in a diametrical plane and facing two vertical ducts, which are defined within the flame divider and open from the top into respective radial arcuate Venturi effect chambers defined in the outer annular chamber. Furthermore, each arcuate chamber is fluidly connected to the interior chamber of the burner through two radial channels.

[0007] In greater detail, in this burner, the gas supply conduit extends horizontally below the bottom of the two cups along their alignment direction, engaging the two vertical injectors that feed gas to the two chambers. arched. However, the fact that one injector is closer to the gas inlet than the other means that most of the gas comes out of that injector, which is the first to find the gas. It follows that a greater quantity of gas reaches the arcuate chamber fed by the injector closest to the gas inlet, so that the corresponding flames that come out of the holes in said chamber are more consistent than those that come out of the holes. of the other arched chamber. Essentially, in this burner, the flames generated are not equal or evenly distributed along the entire circumference.

[0008] Furthermore, in this known burner, the primary air is always and exclusively obtained above the hob.

[0009] Document EP1459012 discloses a burner comprising a cup part and a flame divider element that rests on said cup part and consisting of two parts (that is, a Venturi tube and a hollow body) joined by means of connecting elements. The hollow body of the flame divider has a central inner chamber closed by a circular plate, a first annular chamber closed by a first annular plate and a second annular chamber closed by a second annular plate. These three plates are made up of separate pieces. Furthermore, the radial channels connecting the inner chamber to the first and second annular chambers are closed in their upper part by a wall of the body of the flame divider.

[0010] Document EP0797048 discloses a gas burner with a central portion and an annular portion that are closed at the top by two separate covers, respectively a first cover and a second cover that are located at different heights; in fact, the central portion rises above the annular portion.

[0011] Document EP0903538 discloses a gas burner for gas cookers comprising: a concentric central flame ring with two concentric circumferential rings; radial ducts for feeding the primary air-gas mixture to the circumferential crown and a substantially horizontal Venturi effect chamber defined by surfaces facing and equidistant from the burner body and from the cover of the central flame crown respectively. In the gas burner according to document EP0903538, the primary air inlet always and only occurs from above the hob.

[0012] Document EP0676591 refers to domestic cooktops in which generic burners can take in primary air from above or below the cooktop.

[0013] An object of the invention is to provide a gas burner with only three components, and / or in any case a reduced number of components.

Another object of the invention is to provide a gas burner obtainable at a very low production cost.

[0015] Another object of the invention is to provide a gas burner that can be installed extremely easily, quickly and safely.

[0016] Another object of the invention is to provide a gas burner in which the flame distribution is uniform throughout its entire extension.

[0017] Another objective of the invention is to provide a gas burner using nozzle holders in which the primary air is sucked under the cooking plate (such as those extended in certain countries, such as Brazil).

[0018] These and other objects that will be apparent from the description that follows are achieved according to the invention by means of a gas burner with the features of claim 1.

The present invention is made clearer below by means of some preferred embodiments thereof described by way of non-limiting example with reference to the attached drawings, in which:

Figure 1 is an exploded perspective view of a burner installation according to the invention, seen from above,

Figure 2 is an exploded perspective view of the same view from below,

Figure 3 is a vertical section through it in the assembled configuration,

Figure 4 shows the flame divider of the burner of Figures 1-3 in plan view,

Figure 5 is a plan view showing a cover applicable to the flame divider of Figure 4,

Figure 6 is a plan view showing a different embodiment of the burner flame divider according to the invention,

Figure 7 is a plan view showing a cover applicable to the flame divider of both Figure 4 and Figure 6.

As can be seen from the figures, the burner 2 according to the invention comprises a flame divider 4, which can be installed in an injector holder 6, and a cover 8.

In particular, the injector holder 6 is of the traditional type and adheres from below to the metal sheet of a cooking plate 10 to which it is intended to fix the burner by means of screws. Advantageously, the injector holder 6 can also belong to a different burner that had previously been mounted on the cooking plate 10, so that its installation is particularly easy for the user.

[0022] According to the installation represented in Figures 1-3, the injector holder 6 comprises a plate 12 provided with lateral openings 13 for the inlet of primary air obtained from below the cooking plate. In greater detail, the side wall of the plate 12 is provided with an outwardly projecting flange 14 to adhere to the sheet metal of the cooktop 10 from below. Furthermore, said side wall extends above flange 14 to define a collar 15 on which flame divider 4 rests and is supported.

[0023] The injector holder 6 with plate 12 is particularly advantageous since it is small and compact and, furthermore, by obtaining the primary air below the cooking plate 10, it does not require large dimensions to increase the power of the burner.

[0024] In the described installation, the injector holder 6 comprises a gas supply conduit 20. This extends horizontally below the bottom of the plate 12 of the injector holder 6, is open at one end 21 for the inlet of air and communicates with a vertical injector 22 bolted centrally to the injector holder base.

[0025] The installation represented in Figures 1-3 is configured to receive the flame divider 4 at rest.

The flame divider 4 comprises an outer chamber 26 of generally annular shape, and an inner chamber 28 of generally circular shape, between which at least one cavity 29 is defined.

[0027] A tubular conduit 30 extends downwardly from the inner chamber 28 of the flame divider 4 and is inserted into the collar 15 of the plate 12 until the upper edge of said collar 15 abuts against the lower surface 27 of the flange. that surrounds the tubular conduit 30. In more detail, this contact between the upper edge of the collar 15 and the lower surface of the flange 27 that surrounds the tubular conduit 30 of the flame divider 4 defines a hermetic seal that prevents the primary air from entering on plate 12 above the hob. In the case of the installation of the flame divider 4 on an injector holder 6 with the plate 12, the centering is suitably ensured by inserting the tubular part 30 of the flame divider 4 into the collar 15 of the injector holder 6.

Furthermore, shaped projections 23 extending downward are provided on the lower surface of the flange 27 of the flame divider 4.

[0029] The way in which the flame divider 4 rests on the nozzle holder 6 is such that the flame divider is separated from the metal plate 10 of the cooking plate to the point where it determines steps with it to the secondary air 25 provided for the flames arising from the cavity 29 of the flame divider 4.

More particularly, the outer annular chamber 26 of the flame divider 4 has an outer wall 32 that extends along a cylindrical surface, and an inner wall 34, a certain part of which extends concentrically to the wall. outer 32, but is then connected to substantially radial portions to the cylindrical wall 35 ^{of the inner chamber} 28 ^.

[0031] Advantageously, second shaped projections 39 are provided on the lower surface of the outer annular chamber 26 to prevent decompensation, imbalance or incorrect positioning of the flame divider 4 in the event of inadvertent contacts thereof.

[0032] In a first embodiment of the flame divider 4 (see Figures 1 and 4), the outer annular chamber 26 of the flame divider 4 is fluidly connected to the inner chamber 28 through two substantially radial channels 36 (diametrically aligned) dividing the space between the outer annular chamber 26 and the inner circular chamber 28 into two symmetrical cavities 29. Furthermore, the outer annular chamber 26 is divided into two arcuate sectors 39 separated from each other by two diametrically opposed passages 41 which form two interignition channels between the interior cavities 29 of the flame divider 4 and the exterior.

In a second embodiment of the flame splitter 4 (see Figure 6), the outer annular chamber 26 is fluidly connected to the inner circular chamber 28 through four substantially radial channels 36 (arranged substantially spaced apart). 90 o), which divide the space between the outer annular chamber 26 and the inner circular chamber 28 into four equal cavities 29.

Furthermore, the outer annular chamber 26 is divided into four sectors 39 separated from each other by four passages 41 that form four interignition channels.

In an embodiment not shown here, the outer annular chamber 26 and the inner circular chamber 28 of the flame divider 4 are fluidly connected to each other by a single channel 36. In this case, there is a a single cavity 29, which surrounds the inner circular chamber 28, and a single interignition channel 41.

In more detail, in the two depicted embodiments of the flame divider 4, the outer annular chamber 26 and the inner circular chamber 28 are bounded by a single continuous wall which is provided, along its entire extension with the exception of the parts related to the radial channel or channels (s) 36, of a plurality of orifices for the exit of the air / primary gas mixture and the generation of at least two rings of flames. Said holes suitably comprise main holes 42 and secondary holes 43 (see Figures 1 and 2).

[0037] Preferably, said holes 42 and 43 are defined in the outer wall 32 of the outer annular chamber 26, to generate a first ring of flames directed outwardly, in the inner wall 34 of the outer annular chamber 26, to generate a second intermediate ring of flames that open in the cavity 29 and in the side wall 35 of the inner chamber 28, to generate a third inner ring of flames that also open in the cavity 29.

In further embodiments of the present invention, not shown herein, only two flame rings may be provided, one fed through holes 42, 43 provided in outer wall 32 of outer annular chamber 26 and the other fed through the holes 42, 43 provided in the inner wall 34 of the outer annular chamber or, alternatively, provided in the side wall 35 of the inner circular chamber 28 of the flame divider 4.

The tubular conduit 30 of the flame divider 4 defines a vertical channel 46 whose bottom faces the injector 22 mounted on the injector holder 6 and opens at the top into a radial chamber 47 with a Venturi effect, circumferentially limited by the wall. 35 of the inner chamber 28, bounded at the bottom by a base 49, and bounded at the top by a cover 8, the position of which with respect to the flame divider 4 is defined by four centering pins 50 provided therein.

[0040] Preferably, curved partitions 37 are provided which carry a central passage opening between the circumferential wall 35 of the inner chamber 28 and the upper end of the tubular conduit 30, to define arcuate lower chambers in cooperation with the circumferential wall 35. In In particular, the mixture exiting the tubular conduit 30 enters the lower arched chambers through the passage opening defined in the curved partitions 37 and emerges therefrom through the holes 42, 43 provided in the side wall 35 of the chamber. inner circular 28 of the flame divider 4. In this way, the mixture exiting the tubular conduit 30 is slowed down to prevent the detachment of the flame and to provide greater stability to the main flame ring fed through the holes 42, 43 provided in the circumferential wall 35 of the inner circular chamber 28.

The cover 8 is composed of a single piece and comprises an outer annular portion 52, an inner discoidal portion 54 and four shaped radial portions 56 whose purpose is to connect the outer portion 52 and the inner portion 54 to each other and close at the top channels 36 and / or passageways 41. In particular, in the cover shown in Figure 8, which is adapted to rest on the flame splitter of Figures 1 and 4, two radial connection portions 56 are provided diametrically aligned to closing the two channels 36 of the flame divider 4. On the contrary, in the cover of Figure 7, four shaped radial connection portions 56 arranged at 90 ° to each other are provided to top closing the four channels 36; this cover 8 is particularly adapted to rest on the four-channel flame splitter of figure 6, although it can also be used in a suitable way in combination with the two-channel flame splitter of figure 4 (see figures 1-2) .

If a flame divider 4 is provided with a single radial channel 36, the cover 8 may comprise a single radial portion 56 for connecting the inner discoidal portion 52 to the outer annular portion 56, to close said radial channel 36 from above. .

The burner according to the invention works in the following way.

The gas that enters through the inlet opening 21 from the conduit 20 emerges from the injector 22 and enters the vertical conduit 46 of the flame divider 4, drawing with it the primary air extracted under the cooktop 10 (see Figures 1-3).

The gas and primary air stream that begins to mix within the vertical duct 46 then completes its mixing in the corresponding radial Venturi chamber 47, limited above by the inner discoidal portion 54 of the cover 8.

[0046] Therefore, the mixture obtained in this way can feed the inner ring of flames emerging from the holes 42 of the inner circular chamber 28. Furthermore, the mixture spreads along the channels 36, closed from above through the connecting portions 56 of the cover 8, to reach the outer annular chamber 26 of the flame divider 4 to feed the outer flame ring and, if provided, also the intermediate flame ring.

The injector holder 6 suitably comprises a support arm 60 for a spark plug 62.

[0048] From the foregoing, it can be seen that the burner according to the invention is much more advantageous than traditional burners with multiple flame rings, and in particular:

- it is made up of only three parts and, by virtue of the flame splitter's one-piece injection-cast construction, without secondary machining operations, it is extremely simple and economical to produce,

- although it is designed for a burner with two or three flame rings, the cover is also built in one piece, which also makes the production of the burner extremely simple and economical, - it has a radial mixing chamber of the Venturi type, which contributes to a reduction in the overall vertical height of the burner,

- it has a single injector located in the center of the injector holder, and this, combined with the fact that the radial Venturi effect chamber is defined in the inner circular portion of the flame divider, facing directly the injector, implies that a single mixture that is evenly distributed also within the outer annular chamber of the flame divider, to obtain the formation of uniform flame rings along the respective circumferences,

- the assembly of the three components (nozzle holder, flame divider and cover) is particularly easy, fast and intuitive.

In particular, the burner according to the invention is different and more advantageous than traditional burners by the fact that, in addition to consisting only of three components (the nozzle holder, the flame divider and the cover), it presents the at the same time a flame distribution that is uniform and homogeneous throughout its circumferential development.

Claims (10)

1. Gas burner with at least two flame rings, consisting of: - an injector holder (6) provided with a single vertical injector (22) located centrally at the base of said injector holder (6), - a flame divider (4) with an outer chamber (26) of generally annular development, and an inner chamber (28) of generally circular development, between which an annular cavity (29) is interposed, - a cover (8), and in said gas burner: - said flame divider (4) comprises in its lower part supporting means (30, 23) of said flame divider on said nozzle holder (6, 12) and its connection with it, - the inner circular chamber (28) of said flame divider (4) comprises a single substantially vertical channel (46) facing said single vertical injector (22) of said injector holder (6), said substantially vertical conduit (46) opening in a radial chamber (47) of Venturi effect defined in said inner chamber (28) of the flame divider (4) and limited above by the central discoidal portion (54) of said cover (8), - said flame divider (4) comprises at least one substantially radial channel (36) for fluid connection between said inner circular chamber (28) and said outer annular chamber (26), said radial channel (36) being closed from above by a corresponding radial part (56) of said cover (8), - said at least two flame rings comprising a first flame ring, generated in the holes (42, 43) provided in the outer wall (32) of said outer annular chamber (26) of the flame divider (4) and at least a second ring of flames that can be generated in the holes (42, 43) provided in the inner wall (34) of said outer annular chamber (26) of the flame divider (4), or in the holes (42, 43) provided in the side wall (35) of said inner chamber (28) of the flame divider (4) or in the holes (42, 43) provided both in the inner wall (34) of said outer annular chamber (26) and in said side wall (35) of said inner circular chamber (28). - said cover (8) is made of a single piece and comprises a central discoidal portion (54), which closes above said inner circular chamber (28), and an annular portion (52) which closes above said outer annular chamber ( 26), - said substantially vertical channel (46) facing said single vertical injector (22) is defined within a tubular conduit (30) extending downward from the inner chamber (28) of the flame divider (4), and characterized by that: - said injector holder (6, 12) is dish-shaped and is provided with openings (13) for the inlet of primary air below a cooking plate (10) in which said burner is to be installed, and because said Support means (30, 23) comprise said tubular conduit (30), which is hermetically inserted into said plate-shaped injector holder (6, 12). 2. Burner according to claim 1, characterized in that: - said openings (13) for the inlet of primary air below the cooking plate (10) are provided laterally in the plate of said injector holder (6), the side wall of the plate (12) being provided with a first flange ( 14) protruding outward to adhere underneath to the metal plate of the cooking plate (10), said side wall of the plate (12) extending above said first flange (14) to define a collar (15) on the supporting and holding the flame divider (4), - said tubular conduit (30) is inserted into the collar (15) of the plate (12) of the injector holder (6) until the upper edge of said collar (15) abuts the lower surface (27) of a second flange that surrounds the tubular duct (30), thus defining by means of this contact a hermetic closure that prevents the primary air from entering the plate (12) of the injector holder (6) above the cooking plate. Burner according to claim 1 or 2, characterized in that said tubular conduit (30) is dimensioned so that it adheres to the inner wall of an upper collar (15) provided in said plate-shaped injector holder (6, 12), thereby defining a hermetic seal that prevents primary air from entering the dish-shaped nozzle holder (6, 12) above the cooking plate. 4. Burner according to one or more of the preceding claims, characterized in that said support means comprise: - a tubular conduit (30), which extends downwardly from the inner chamber (28) of the flame divider (4), and is hermetically inserted into said injector holder (6, 12) in the case in which said injector holder (6, 12) has the shape of a plate provided with openings (13) for the entry of primary air below a cooking plate (10) in which it is intended to install said burner, - shaped projections (23) projecting downwardly from the base of the flame divider (4), and engaging with said injector holder (6, 16) in the case where said injector holder (6, 16) is in the shape of a closed cup laterally and at its base, in such a way as to define openings for entry into the primary air injector holder (19), extracted above the cooking plate (10) in which said burner is to be installed. Burner according to one or more of the preceding claims, characterized in that said flame divider (4) is supported on said injector holder (6) by means of said support means (30, 23) in such a way that it is separated of a cooking plate (10) at a distance such as to define, with it, openings for the entry, into said annular cavity (29), of secondary air (25) destined for said second ring of flames. Burner according to one or more of the preceding claims, characterized in that at least one opening (41) forming an interignition channel is provided in said outer annular chamber (26). Burner according to one or more of the preceding claims, characterized in that said holes provided in the outer wall (32) of said outer annular chamber (26) of the flame divider (4) and / or in the inner wall ( 34) of said outer annular chamber (26) of the flame divider (4) and / or on the side wall (35) of said inner circular chamber (28) comprise main holes (42) and secondary holes (43). Burner according to one or more of the preceding claims, characterized in that said flame divider (4) comprises two radial channels (36) for fluid connection between its inner circular chamber (28) and its outer annular chamber (26) . Burner according to claim 8, characterized in that the walls that limit said radial channels (36) of the flame divider (4) comprise secondary interignition holes to spread the flames between said ring of flames generated in the holes (42 , 43) provided in the inner wall (34) of said outer annular chamber (26) of the flame divider (4) and said ring of flames generated in the holes (42, 43) provided in the side wall (35) of said inner circular chamber (28) of the flame divider (4). Burner according to one or more of the preceding claims, characterized in that said injector holder (6) comprises an arm (60) for supporting a spark plug (62) located in said annular cavity (29).