CN104005982B - Pump - Google Patents

Abstract

A kind of pump, impeller (16) is located at rotary shaft (7) and above and is contained in the enclosure, this impeller has the entrance (17) connected with suction chamber (6) and the outlet connected with discharge chamber (5), this pump has the axle envelope portion sealed between rotary shaft (7) and shell, entrance (17) in impeller (7) is formed with the 1st gap (25) connected by suction chamber (6) with discharge chamber (5) between side with shell, be provided with axle water shutoff (W) from axle water shutoff feed path (45) of the 1st gap (25) supply to axle envelope portion.Use the present invention, the number of the decompressing unit making the pressure of axle water shutoff drop to required for being most suitable for the pressure of axle envelope can be reduced, can be by the simple structure of axle water shutoff feed path.

Description

Pump

Technical field

The present invention relates to a kind of as axle water shutoff, the water in discharge chamber is supplied in the pump in axle envelope portion.

Background technology

In the past, this pump as shown in figure 19, was provided with mechanical sealing member 101 and as axle envelope portion, in the outlet of impeller 102 103 peripheries are formed with altitude chamber 104.It is formed with gap between sliding part and the sliding part of shell 105 after impeller 102 106, the close axle 107 after impeller 102 be formed in part with balance cylinder 108, impeller 102 is formed balance pipe 109 (balance hole).Balance pipe 108 is in the face of mechanical sealing member 101, and connects with gap 106.It addition, balance pipe 109 makes balance pipe 108 connect with the entrance 110 of impeller 102.

So, in pump operation, the water flowed in shell 105 from pump intake flows into from the entrance 110 of impeller 102, In impeller 102, flow out to altitude chamber 104 from outlet 103, flow to outlet from altitude chamber 104.In pump operation, altitude chamber A part of water in 104 is fed into balance cylinder 108 through gap 106, with mechanical sealing member 101 in balance cylinder 108 Contact, while flowing, returns to the entrance 110 of impeller 102 by balance pipe 109.Thus, the axial thrust of impeller 102 is subtracted Gently, mechanical sealing member 101 is cooled down.

Pump as described above is such as documented in following patent documentation 1

Prior art literature

Patent documentation

Patent documentation 1: Japanese Patent Publication 5-12696

Patent documentation 2: Japanese Unexamined Patent Publication 2010-216470

But, in above-mentioned conventional form, owing to a part of water in altitude chamber 104 is supplied to as axle water shutoff Mechanical sealing member 101, therefore, the pressure of axle water shutoff sometimes is too high compared with the pressure being suitable to axle envelope.In such occasion, there is this The problem of sample: be difficult to the pressure of axle water shutoff drops to the pressure being most suitable for axle envelope.It addition, there is also the problem that due to Forming balance cylinder 108 and balance pipe 109 on impeller 102, therefore, the processing for impeller 102 spends the time, the structure of impeller 102 Make and become complicated.

It addition, as other conventional form, patent document 2 discloses that such a pump: be formed with on shell and will arrange The a part of water going out side room is supplied to axle envelope portion and countershaft envelope portion carries out the water shutoff passage of water seal, is provided with little on water shutoff passage Hole.So, in pump operation, a part of water flowing out to discharge side room from the outlet of impeller is just supplied to through water shutoff passage Axle envelope portion.It is now, also above the pressure sucked in side room and higher than the pressure being suitable to axle envelope owing to discharging the pressure in side room, Therefore, utilize aperture and by the pressure of the water of flowing in water shutoff passage to being most suitable for the pressure that axle seals.

But, in the invention described in above-mentioned patent documentation 2, have problems that: the pressure in discharge side indoor is relatively High occasion, the number of aperture (decompressing unit) will increase.

Summary of the invention

Invent problem to be solved

It is an object of the invention to, it is provided that a kind of pump, can reduce and make the pressure of axle water shutoff drop to the pressure being most suitable for axle envelope The number of the decompressing unit (such as aperture etc.) required for power, and can be by the simple structure of axle water shutoff feed path (water shutoff passage) Change.

For solving the means of problem

To achieve these goals, this 1st invention is such a pump: impeller sets on the rotary shaft and is incorporated in shell In, this impeller has entrance connect with suction chamber and the outlet connected with discharge chamber, this pump have to rotary shaft and shell it Between the axle envelope portion that sealed, in this pump,

Shell is formed as surrounding around impeller, is formed suction chamber and discharge between the entrance side and shell of impeller 1st gap of room connection, is provided with axle water shutoff from the axle water shutoff feed path of the 1st gap supply to axle envelope portion.

So, in pump operation, from suction inlet flow into suction chamber water from the entrance of impeller through impeller from impeller Outlet flows out to discharge chamber, discharges from outlet through discharge chamber.Now, a part of water in discharge chamber is as axle water shutoff By the 1st gap, it is supplied to axle envelope portion through axle water shutoff feed path.

Owing to above-mentioned 1st gap is formed between the entrance side of impeller and shell, accordingly, it is capable to will be near entrance side The water of the low-pressure in the 1st gap is supplied to axle envelope portion as axle water shutoff.Thus, can reduce and make the pressure of axle water shutoff drop to It is most suitable for the number of decompressing unit required for the pressure of axle envelope.

Pump in this 2nd invention is, shell has the housing main body of storage impeller and by the entrance side outside of impeller The outer girdle lived,

1st gap is formed between the entrance side periphery of impeller and the inner circumferential of outer girdle.

Pump in this 3rd invention is, outer girdle embeds housing main body, is formed with the 2nd outside between girdle and housing main body Gap,

It is formed with the axle water shutoff connected with the 1st gap and the 2nd gap outside on girdle and takes out runner,

Runner and a part for the 2nd gap composition axle water shutoff feed path are taken out in axle water shutoff.

So, a part of water in discharge chamber takes out runner, the conduct through the 2nd gap from the 1st gap by axle water shutoff Axle water shutoff is supplied to axle envelope portion.

Pump in this 4th invention is, outside a part or all-round for the circumference between periphery and the housing main body of girdle, shape Cheng You 2 gap.

So, though axle water shutoff take out runner girdle outside circumference produce slightly deviation, as long as with the 1st gap and the 2nd Gap connects, and thus can reduce and make and the time of assembling.Especially between periphery and the housing main body of girdle outside Circumference all-round when being formed with 2 gap, the 1st gap is connected, with outer girdle by axle water shutoff taking-up runner with the 2nd gap The position that runner is taken out in the axle water shutoff of circumference is unrelated.Thus, even if axle water shutoff taking-up runner is located at any of the circumference of outer girdle Position, it is possible to form the axle water shutoff feed path in the 1st gap to axle envelope portion.Therefore, do not consider that the position of runner is taken out in axle water shutoff Just outer girdle can be arranged on housing main body, can reduce and make and the time of assembling.

Pump in this 5th invention is, multiple positions of the circumference of girdle are formed with axle water shutoff and take out runner outside.

So, axle water shutoff is taken out runner from the 1st gap by each axle water shutoff and is fed into the 2nd gap.Now, it is flowed into Even if the flow that the axle water shutoff of runner is taken out in arbitrary axle water shutoff reduces, axle water shutoff is also taken out in flow other axle water shutoff nondecreasing Runner flows, therefore axle water shutoff reliably can be supplied to the 2nd gap from the 1st gap.

Pump in this 6th invention is, the row discharged by the remainder of the axle water shutoff by axle water shutoff feed path Put and from axle water shutoff feed path difference and connect with suction chamber with path.

So, axle water shutoff feed path remains the occasion of a part of axle water shutoff, the axle water shutoff of this remainder just from Axle water shutoff feed path returns to suction chamber by discharge path.Thus, impeller is formed without balance cylinder and balance pipe The axle water shutoff of remainder just can be returned to suction chamber side, therefore can be by the simple structure of impeller, the time of Impeller Machining Just reduce.

Pump in this 7th invention is to be provided with decompressing unit on axle water shutoff feed path.

So, axle water shutoff, when flowing in axle water shutoff feed path, is depressurized to be most suitable for the pressure of axle envelope by decompressing unit Power.

Pump in this 8th invention is that shell is divided into multiple segmentation shell bodies with composition surface, respectively splits shell body By connecting engaging between composition surface,

It is formed with axle water shutoff feed trough on the composition surface of arbitrary segmentation shell body,

Axle water shutoff feed trough constitutes a part for axle water shutoff feed path.

So, the composition surface to segmentation shell body is implemented groove processing and is formed axle water shutoff feed trough.Thus, can easily be formed A part for axle water shutoff feed path.

Pump in this 9th invention is that shell is divided into multiple segmentation shell bodies with composition surface, respectively splits shell body By connecting combining between composition surface,

Axle water shutoff feed path has: the axle water shutoff feed trough being formed on the composition surface of arbitrary segmentation shell body；And Runner is taken out in the axle water shutoff being formed on outer girdle,

The cross section of fluid channel of axle water shutoff taking-up runner amasss the cross section of fluid channel of the end being different from axle water shutoff feed trough and amasss.

So, a part of liquid in discharge chamber, take out runner as axle water shutoff from the 1st gap by axle water shutoff, from Axle water shutoff is taken out runner and is supplied to axle envelope portion through axle water shutoff feed trough.Now, cut due to the runner of axle water shutoff taking-up runner Area is different from the cross section of fluid channel of the end of axle water shutoff feed trough and amasss, and therefore, axle water shutoff is when flowing to axle from axle water shutoff taking-up runner It is depressurized during water shutoff feed trough.Thus can reduce the number of decompressing unit further.

Pump in this 10th invention is that impeller sets on the rotary shaft and is contained in the enclosure, this impeller by liquid from suction Entering the room and deliver to discharge chamber, this pump has the axle envelope portion that will be sealed between rotary shaft and shell, in this pump,

Shell has the housing main body of storage impeller and the outer girdle relative with impeller,

Outer girdle embeds in housing main body,

The gap connected with discharge chamber it is formed with outside between girdle with housing main body,

It is provided with axle water shutoff from the axle water shutoff feed path of gap supply to axle envelope portion.

So, a part of water in discharge chamber is supplied to axle through axle water shutoff feed path as axle water shutoff by gap Envelope portion.Owing to axle water shutoff is depressurized when flowing in gap, therefore, can reduce making the pressure of axle water shutoff drop to be most suitable for axle The number of the decompressing unit required for the pressure of envelope.

Pump in this 11st invention is double suction centrifugal pump.

Invention effect

As it has been described above, the employing present invention, can reduce and make the pressure of axle water shutoff drop to required for the pressure being most suitable for axle envelope The number of decompressing unit (such as aperture etc.), can be by the simple structure of axle water shutoff feed path.

Accompanying drawing explanation

Fig. 1 is the side view of the pump of first embodiment of the present invention.

Fig. 2 is the X-X arrow view in Fig. 1.

Fig. 3 is the Y-Y arrow view in Fig. 1.

Fig. 4 is the top view of the segmentation shell body of the bottom of this pump, represents impeller, rotary shaft, outer girdle and axle envelope portion State after being removed.

Fig. 5 is the sectional view in the axle envelope portion of this pump.

Fig. 6 is the amplification plan view of an axle water shutoff feed path part for this pump.

Fig. 7 is the diagram of the component with small hole of this pump, and Fig. 7 (a) is axonometric chart, and Fig. 7 (b) is to insert in axle water shutoff feed trough Diagram.

Fig. 8 is the sectional view of the scope being formed with the 1st and the 2nd gap representing the pump in second embodiment of the present invention.

Fig. 9 is the X-X arrow view in Fig. 8.

Figure 10 is the sectional view of the scope being formed with the 1st and the 2nd gap representing the pump in third embodiment of the present invention.

Figure 11 is the sectional view of the forming part representing that runner is taken out in the axle water shutoff of the pump in fourth embodiment of the present invention.

Figure 12 is the enlarged drawing of the axle water shutoff feed path part representing the pump in fourth embodiment of the present invention.

Figure 13 is the enlarged drawing of an axle water shutoff feed path part for the pump in fifth embodiment of the present invention.

Figure 14 is the enlarged drawing of an axle water shutoff feed path part for the pump in sixth embodiment of the present invention.

Figure 15 is the side view of the pump in seventh embodiment of the present invention.

Figure 16 is the X-X arrow view in Figure 15.

Figure 17 is the top view of the segmentation shell body of the bottom of the pump in eighth embodiment of the present invention.

Figure 18 is the close-up top view of the segmentation shell body of the bottom of Figure 17.

Figure 19 is the sectional view of the axle water shutoff feed path representing conventional pump.

Symbol description

1 double suction centrifugal pump

2 shells

5 discharge chambers

6 suction chambers

7 rotary shafts

9 axle envelope portions

16,70 impeller

17 entrances

18 outlets

21 housing main bodies

22,71 outer girdle

25 the 1st gaps

30 the 2nd gaps

Runner is taken out in 31 axle water shutoffs

35,36 segmentation shell body

38,40 composition surface

45,60 axle water shutoff feed path

46 axle water shutoff feed troughs (axle water shutoff feed path)

50 discharge grooves (discharge path)

52 component with small hole (decompressing unit)

73 gaps

W axle water shutoff

Detailed description of the invention

Below, it is explained with reference to embodiments of the present invention.

(the 1st embodiment)

First, the 1st embodiment of the present invention is described with reference to Fig. 1～Fig. 7.

As shown in Figure 1 to 4,1 is double suction centrifugal pump, is formed with suction inlet 3 and outlet 4 on shell 2.At shell 2 Inside it is formed with the discharge chamber 5 (volute room) connected with outlet 4 and the suction chamber 6 connected with suction inlet 3.It addition, suction chamber 6 are positioned at the both sides of discharge chamber 5 at axis direction C.

Shell 2 is formed the pair of right and left axle through hole 8 of through rotary shaft 7 (main shaft).It is provided with in axle through hole 8 The axle envelope portion 9 of sealing will be given between rotary shaft 7 and shell 2.As it is shown in figure 5, axle envelope portion 9 has the inner circumferential of axle through hole 8 Circular multiple gland liners 10 that the outer peripheral face of face and rotary shaft 7 is sealed and circular ring for the sealing liquid 11.Gland Liner 10 utilizes liner thrust piece (diagram is omitted) to be pushed to the inboard of axle through hole 8.

It addition, the all-round of inner peripheral surface at ring for the sealing liquid 11 is formed with internal circle groove 12.Outer peripheral face all-round at ring for the sealing liquid 11 It is formed with circumferential groove 13.It addition, be formed with the company of multiple radial direction connected with circumferential groove 13 by internal circle groove 12 on ring for the sealing liquid 11 Through hole 14.

It addition, as in figure 2 it is shown, be provided with impeller 16 in rotary shaft 7.Rotary shaft 7 and impeller 16 are incorporated in shell 2. Drive it addition, rotary shaft 7 is rotated by the driving means such as motor (diagram is omitted).

Impeller 16 is entrance 17 (inflow part) and the double suction of outlet 18 (outflow portions) at axis direction C with two positions Type.It addition, impeller 16 is centrifugal and is enclosed shape.The entrance 17 of impeller 16 connects with suction chamber 6, outlet 18 and discharge chamber 5 Connection.Additionally, impeller 16 has vane rings 19 in the periphery of entrance 17.

Shell 2 has: the housing main body 21 of storage impeller 16；And surround the periphery (entrance side of impeller of vane rings 19 One example of periphery) outer girdle 22.It addition, housing main body 21 has the separating part 23 separating discharge chamber 5 with suction chamber 6, outward Girdle 22 is embedded on separating part 23.

As shown in Fig. 2, Fig. 6, vane rings 19 is the most relative at radial direction A and the axis direction C of impeller 16 with outer girdle 22.? The 1st ring-type gap 25 it is formed with between vane rings 19 and outer girdle 22.1st gap 25 connects with discharge chamber 5 and suction chamber 6, In the way of discharge chamber 5 to suction chamber 6, there is the expansion section 25a that sectional area expands with axis direction C in radial direction A.

The protuberance 26 that the oriented radial outside of all-round formation of the periphery of girdle 22 is prominent outside.It addition, at housing main body 21 Separating part 23 all-round be formed with recess 27 (with reference to Fig. 4, Fig. 6), protuberance 26 embeds in recess 27.It addition, outer girdle 22 A part of outer peripheral face is practised physiognomy mutually with a part for separating part 23 and is contacted and all-round composition sealing surface 28, a part of appearance of protuberance 26 Practise physiognomy mutually with a part of inner surface of recess 27 and contact and all-round composition sealing surface 29 in face.

Sealing surface 28 radially will sealed between housing main body 21 and outer girdle 22, and sealing surface 29 is at axis direction C To be sealed between housing main body 21 and outer girdle 22.Utilize these to seal, prevent the water of discharge chamber 5 from housing main body 21 And leak into suction chamber 6 between outer girdle 22.

As shown in Figure 6, inside the inner circumferential of the outer peripheral face of the protuberance 26 of outer girdle 22 and the recess 27 of separating part 23 between, All-round it is formed with the 2nd circular gap 30.Being formed with axle water shutoff outside on girdle 22 and take out runner 31, stream is taken out in this axle water shutoff The one end open in road 31 is in the 1st gap 25 and other end opening is in the 2nd gap 30.It addition, in the present embodiment, axle seals Although water takes out runner 31 and is formed on a position of outer girdle 22, but also may be formed on multiple positions of circumference.

As shown in FIG. 1 to 3, the shell 2 horizontal plane in the axle center 33 comprising rotary shaft 7 is divided into two parts: The segmentation shell body 35 of bottom and the segmentation shell body 36 on top.The segmentation shell body 35 of bottom has the convex of bottom in upper end The composition surface 38 of edge 37 and bottom.It addition, the segmentation shell body 36 on top bottom have top flange part 39 and on The composition surface 40 in portion.Shown in solid such as Fig. 1, the segmentation shell body 35 of bottom and the segmentation shell body 36 on top, by composition surface 38, engage each other between 40 and utilize multiple bolt 41 to connect.As shown in Figure 2, Figure 4 shows, difference on the composition surface 38 of bottom Being formed with multiple seal groove, these seal grooves are embedded in the rubber system sealed between two composition surfaces 38,40 and rope form Seal member 43a～43e of multiple differences.

As shown in Fig. 2, Fig. 5, Fig. 6, shell 2 is provided with the axle that axle water shutoff W is supplied to axle envelope portion 9 from the 1st gap 25 Water shutoff feed path 45.Axle water shutoff feed path 45 has described axle water shutoff and takes out runner 31, described 2nd gap 30 and axle water shutoff Feed trough 46.

Axle water shutoff feed trough 46 be formed at bottom segmentation shell body 35 bottom composition surface 38 on, and its one end with 2nd gap 30 connects, and the other end connects with the circumferential groove 13 of ring for the sealing liquid 11.It addition, axle water shutoff feed trough 46 is being split two It it is the groove that cross section is tetragon of upper surface open under state after shell body 35,36 separation.By two segmentation shell bodies 35,36 Under state after connection, the upper surface of axle water shutoff feed trough 46 is closed by the composition surface 40 on top.It addition, axle water shutoff feed trough 46 Take out runner 31 by the 2nd gap 30 with axle water shutoff to connect.The cross section of fluid channel of the one end of axle water shutoff feed trough 46 is long-pending to be set Must be long-pending bigger than the cross section of fluid channel of axle water shutoff taking-up runner 31.

As shown in Figure 6, the periphery of girdle 22 outside, it is provided with the bolt that external girdle 22 is stoped to the rotation of circumference Deng the spline parts 47 constituted.It addition, be formed with depressed part 48 on the composition surface 38 of bottom, the head of spline parts 47 embeds In depressed part 48, prevent outer girdle 22 to rotating in a circumferential direction.Outer girdle 22 utilizes spline parts 47 and depressed part 48 to be positioned Become: take out runner 31 in circumferential axis water shutoff consistent with the one end of axle water shutoff feed trough 46.

As shown in Figure 2, Figure 4 shows, on the composition surface 38 of bottom, the remainder of the axle water shutoff W being fed into axle envelope portion 9 gives The discharge groove 50 (example in discharge path) of discharge from axle water shutoff feed trough 46 difference and connects with suction chamber 6.It addition, Discharge groove 50 has the shape identical with axle water shutoff feed trough 46.

As shown in Fig. 2, Fig. 4, Fig. 6, Fig. 7, axle water shutoff feed trough 46 and discharge groove 50 are respectively equipped with detachable Component with small hole 52 (example of decompressing unit).Component with small hole 52 has the main part 52a of tetragon and runs through main part The opening 52b of 52a both ends of the surface.

It addition, as in figure 2 it is shown, owing to two positions on double suction centrifugal pump 1 are provided with axle envelope portion 9, therefore axle water shutoff supplies It also is provided with two to path 45.

Below, the effect of above-mentioned composition is described.

In pump 1 runs, the water flowing into suction chamber 6 from suction inlet 3 flows in impeller 16 from the entrance 17 of impeller 16, passes through In impeller 16, flow out to discharge chamber 5 from the outlet 18 of impeller 16, be discharged to the outside of pump 1 from outlet 4 through discharge chamber 5. Now, as shown in Figure 6, a part of water of discharge chamber 5 passes through the 1st gap 25 from the discharge chamber 5 that pressure is high, flows to pressure ratio and discharges The suction chamber 6 that room 5 is low.In the 1st gap 25, the some or all of water of flowing leads to from the 1st gap 25 as axle water shutoff Cross axle water shutoff and take out runner 31, flow in axle water shutoff feed trough 46 through the 2nd gap 30, and as shown in Fig. 2, Fig. 5, pass through axle Water shutoff feed trough 46 and arrive the circumferential groove 13 of ring for the sealing liquid 11, then be supplied to internal circle groove 12 by intercommunicating pore 14.

Thus, axle water shutoff W is fed into axle envelope portion 9, and axle envelope portion 9 is by water seal.The axle water shutoff W of trace is at gland liner 10 Flow to axis direction C between the outer peripheral face of inner peripheral surface and rotary shaft 7, somewhat leak into outside and the inside in axle envelope portion 9.Utilize this Plant leakage, can prevent extraneous air from entering in shell 2 from axle envelope portion 9, or the water in shell 2 can be suppressed to leak from axle envelope portion 9 To the amount outside shell 2.Further, since axle envelope portion 9 is cooled down by axle water shutoff W, therefore can prevent because of rotary shaft 7 and gland liner 10 Between frictional heat and make axle envelope portion 9 become high temperature, prevent gland liner 10 from sintering and being fixed in rotary shaft 7, simultaneously energy Extend the life-span of gland liner 10.

Further, since axle water shutoff W is subtracted by being located at the opening 52b of the component with small hole 52 in axle water shutoff feed trough 46 Pressure, therefore drops to the pressure being most suitable for axle envelope.

As shown in Figure 6, between vane rings 19 and the outer girdle 22 of the entrance 17 that the 1st gap 25 is formed at impeller 16.Therefore, Water near the periphery of the entrance 17 of impeller 16 is close to suction inlet 3, therefore has the low pressure lower than the outlet 18 of impeller 16, recycling By crushing during 1 gap 25, pressure is made to decline further.Owing to the water that can be declined by such pressure is as axle water shutoff W It is supplied to axle envelope portion 9, therefore, the aperture portion making the pressure of axle water shutoff W drop to required for being most suitable for the pressure of axle envelope to be reduced The number of part 52.

Even if it addition, being most suitable for, not using component with small hole 52 also can be dropped to by the pressure of axle water shutoff W, the pressure that axle seals Occasion, cancel component with small hole 52.

It addition, in pump 1 runs, when the part S1 (reference by the radial outside of the outlet 18 of the impeller 16 in discharge chamber 5 Static pressure Fig. 2) is provided as P1, static pressure by part S2 of the radially inner side of the described outlet 18 in discharge chamber 5 (with reference to Fig. 2, Fig. 6) It is provided as P2, the static pressure in suction chamber 6 is provided as P3, time the static pressure in the 1st gap 25 is provided as P4, it is ensured that static pressure P1 ＞ static pressure P2 ＞ The relation of static pressure P4 ＞ static pressure P3.

It addition, as shown in Figure 6, stream is taken out owing to the cross section of fluid channel of the one end of axle water shutoff feed trough 46 is long-pending more than axle water shutoff The cross section of fluid channel in road 31 amasss, therefore, when axle water shutoff W flows to axle water shutoff feed trough 46 from axle water shutoff taking-up runner 31, because of runner The expansion of sectional area and produce crushing and be depressurized.Thus, the aperture being located on axle water shutoff feed path 45 can be reduced further The number of parts 52.

It addition, as in figure 2 it is shown, remaining the occasion of a part of axle water shutoff W, the axle water shutoff W of this remainder is from axle water shutoff Feed trough 46 returns to suction chamber 6 by discharge groove 50.Thus, impeller 16 is formed without balance cylinder or balance pipe just may be used The axle water shutoff W of remainder being returned to suction chamber 6, therefore the structure of impeller 16 is simplified, the time of impeller 16 processing reduces.

It addition, the axle water shutoff W of excess will not be supplied to axle envelope portion 9, can reduce and leak into outside shell 2 from axle envelope portion 9 The leakage rate of axle water shutoff W and become suitable amount.Thus, it is not necessary to be located at the row of the outside of shell 2 in the occasion that leakage rate is many Water pipe arrangement.

It addition, the composition surface 38 that bottom is split the bottom of shell body 35 is implemented groove processing and is formed axle water shutoff feed trough 46, thus can be readily formed a part for axle water shutoff feed path 45.

Further, since the diameter that the interval in the 1st gap 25 is less than the opening 52b of component with small hole 52, therefore, even if passing through 1st gap 25 and containing impurity in the axle water shutoff W of flowing in the opening 52b of component with small hole 52, the size of impurity again smaller than The opening 52b of component with small hole 52.The impurity in axle water shutoff W is this prevents to block the opening 52b of component with small hole 52.

In above-mentioned 1st embodiment, as shown in Figure 6, outer girdle 22 is oriented to axle water shutoff taking-up by spline parts 47 Runner 31 is consistent with the one end of axle water shutoff feed trough 46, but also can cancel rotation prevention portion part 47.In this occasion, even outer girdle 22 to circumferentially rotating, axle water shutoff take out outside the position of runner 31 is partial to relative to the position of the one end of axle water shutoff feed trough 46 Girdle 22 circumference occasion, due to axle water shutoff take out runner 31 by the 2nd gap 30 with one end of axle water shutoff feed trough 46 Portion connects, and therefore, axle water shutoff W takes out runner 31 from the 1st gap 25 by axle water shutoff, securely feeds through the 2nd gap 30 One end to axle water shutoff feed trough 46.Therefore, even cancelling spline parts 47 or just in case forgetting to install spline parts 47 Occasion, it is possible to axle water shutoff W is supplied to axle envelope portion 9.Additionally, cancelling the occasion of spline parts 47, owing to can not consider that axle seals Water takes out the position of runner 31 and is arranged on housing main body 21 by outer girdle 22, makes and the time of assembling accordingly, it is capable to reduce.

In above-mentioned 1st embodiment, as shown in Figure 2, although axle water shutoff feed trough 46 and discharge groove 50 are formed at down On the composition surface 38 of the segmentation shell body 35 in portion, but also may be formed on the composition surface 40 of segmentation shell body 36 on top.

In above-mentioned 1st embodiment, as shown in Figure 4, will be formed on the composition surface 38 of segmentation shell body 35 of bottom Axle water shutoff feed trough 46 be made the part of axle water shutoff feed path 45.However, it is possible to be formed without axle water shutoff feed trough 46, and Gap between composition surface 38 and the composition surface 40 on top of the bottom in the region B that will be impaled by seal member 43a～43c is made A part for axle water shutoff feed path 45.

(the 2nd embodiment)

In the 2nd embodiment, as shown in Figure 8, Figure 9, the 2nd gap 30 is formed at the outer peripheral face of protuberance 26 of outer girdle 22 And scope 55 (the one of a part of 180 ° of the latter half in the circumferential D between inside the inner circumferential of the recess 27 of separating part 23 Example) on.It addition, axle water shutoff is taken out in the other end opening of runner 31 central lower in the circumferential D in the 2nd gap 30.

So, all-round it is formed without the 2nd gap 30, it is possible to obtain the functions and effects identical with the 1st embodiment.

(the 3rd embodiment)

In the 3rd embodiment, as shown in Figure 10, the 2nd gap 30 be formed at outer girdle 22 protuberance 26 outer peripheral face with In the part in circumferential D between inside the inner circumferential of the recess 27 of separating part 23.It addition, the forming range 56 in the 2nd gap 30 Narrower than 180 ° of above-mentioned 2nd embodiment, axle water shutoff takes out runner 31 with axle water shutoff feed trough 46 by the 2nd gap 30 Connection.

So, if the 2nd gap 30 is formed at circumference D in slightly scope, so that it may obtain identical with the 1st embodiment Functions and effects.

It addition, as better form, if the 2nd gap 30 is relative to axle center 33 balanced configuration, then owing to acting on outside The power of girdle 22 is also the most symmetrical, and the position of outer girdle 22 will not offset.It addition, as optimal form, by the 2nd gap 30 Be formed as circular all-round, thus, owing to, in power stepless action outside girdle 22, outer girdle 22 therefore can be reliably prevented Position produces the situation of skew, and axle water shutoff is taken out runner 31 and also be may be formed at any position.

(the 4th embodiment)

In the 4th embodiment, as shown in Figure 11, Figure 12, the circumference of runner 31 girdle 22 outside is taken out in multiple axle water shutoffs Formed with separating predetermined angular.

So, axle water shutoff W takes out runner 31 from the 1st gap 25 by each axle water shutoff and is fed into the 2nd gap 30.Now, Even if producing the interval occasion less than the narrow positions at the interval of defined in the 1st gap 25 because of fabrication error etc., from the 1st The narrow positions in gap 25 flows into the flow of the axle water shutoff W that runner 31 is taken out in axle water shutoff and reduces, owing to axle water shutoff W is also between the 1st Gap 25 flows to the axle water shutoff at position in addition to narrow positions and takes out runner 31, accordingly, it is capable to by axle water shutoff W reliably between the 1st Gap 25 is supplied to the 2nd gap 30.

Even if it addition, arbitrary axle water shutoff taking-up runner 31 blocks, due to axle water shutoff W also at other axle water shutoff taking-up runner 31 flowings, accordingly, it is capable to be reliably supplied to the 2nd gap 30 from the 1st gap 25 by axle water shutoff W.

(the 5th embodiment)

In the 5th embodiment, as shown in figure 13, one end of the outer girdle 22 that the 2nd gap 30 is formed in axis direction C Between face 22a and separating part 23.The runner 31 axis direction C-shaped one-tenth along outer girdle 22 is taken out in axle water shutoff, and runner is taken out in axle water shutoff The one end open of 31 to the 1st gap 25, in the other end opening of axle water shutoff taking-up runner 31 to the 2nd gap 30.

So, the functions and effects identical with the 1st embodiment can be obtained.

(the 6th embodiment)

In the 6th embodiment, as shown in figure 14, impeller 16 has vane rings 19, but shell 2 does not has outer girdle 22.1st Gap 25 is formed between the separating part 23 of vane rings 19 and shell 2.It addition, axle water shutoff feed trough 46 is formed at the segmentation of bottom On the composition surface 38 of the bottom of shell body 35, and its one end and the 1st gap 25 connect, the other end and the periphery of ring for the sealing liquid 11 Groove 13 connects.

So, a part of water of discharge chamber 5 passes through the 1st gap 25 from the discharge chamber 5 that pressure is high, flows to pressure ratio discharge chamber 5 low suction chambers 6.Part or all of water in the 1st gap 25 flowing flows into axle as axle water shutoff W from the 1st gap 25 In water shutoff feed trough 46, arrive the circumferential groove 13 of ring for the sealing liquid 11 by axle water shutoff feed trough 46, then supplied by intercommunicating pore 14 It is given to internal circle groove 12.

(the 7th embodiment)

In the 1st embodiment previously described, as shown in Figure 6, axle water shutoff feed path 45 has axle water shutoff taking-up stream Gap 30, road the 31, the 2nd and axle water shutoff feed trough 46.As being different from the mode of this mode, the 7th embodiment party of explanation below In formula, as shown in Figure 15,16, axle water shutoff feed path 60 has axle water shutoff taking-up runner the 31, the 2nd gap the 30, the 1st and the 2nd axle Water shutoff supply hole 61,62 and outside pipe arrangement 63.It addition, Figure 16 represent two sides segmentation shell body 35,36 with composition surface 38,40 The cross section (i.e. Section X-X in Figure 15) of orthogonal vertical (above-below direction).

It is identical with the 1st embodiment that runner 31 is taken out in axle water shutoff, is formed on outer girdle 22, and the 2nd gap the 30 and the 1st is implemented Mode is identical, between being formed at inside the inner circumferential of the outer peripheral face of the protuberance 26 of outer girdle 22 and the recess 27 of separating part 23.

On the segmentation shell body 36 on the top that the 1st and the 2nd axle water shutoff supply hole 61,62 is formed at shell 2.Wherein, the 1st axle One end and the 2nd gap 30 of water shutoff supply hole 61 connect, other end opening top in the axis direction C of rotary shaft 7 On the end face 36a of segmentation shell body 36.

The one end opening of the 2nd axle water shutoff supply hole 62 described top segmentation shell body 36 end face 36a on, another End connects with the circumferential groove 13 of ring for the sealing liquid 11.

The one end of outside pipe arrangement 63 and the other end of the 1st axle water shutoff supply hole 61 connect, the other end and the 2nd axle envelope The one end of water-supplying hole 62 connects.

It addition, be inserted with the component with small hole 52 of cylinder type in the inside of outside pipe arrangement 63.It addition, the aperture of so-called cylinder type Parts 52, are that the square main part 52a of the component with small hole 52 shown in Fig. 7 (a) is formed as cylindrical shape.It addition, the 1st and the 2nd Axle water shutoff supply hole 61,62 is formed at the portion that the segmentation shell body 36 with top sets the strengthening part 64 of all-in-one-piece above-below direction On position.

It addition, component with small hole 52 also may be formed so that arranges insert port on outside pipe arrangement 63, insert outside from insert port Pipe arrangement 63, or before processing component with small hole 52 is inserted outside pipe arrangement 63, then outside pipe arrangement 63 is curved processing.

Below, the effect of said structure is described.

In pump 1 runs, a part of water in discharge chamber 5 passes through the 1st gap 25 as axle water shutoff W, and from the 1st gap 25 take out runner 31 by axle water shutoff and arrive the 2nd gap 30.The axle water shutoff W arriving the 2nd gap 30 flows into from the 2nd gap 30 again In 1st axle water shutoff supply hole 61, in the 1st axle water shutoff supply hole 61, flow into the 2nd axle water shutoff supply hole by outside pipe arrangement 63 62.The axle water shutoff W flowing into the 2nd axle water shutoff supply hole 62 arrives the circumferential groove 13 of ring for the sealing liquid 11 again from the 2nd axle water shutoff supply hole 62, It is supplied to internal circle groove 12 by intercommunicating pore 14 from circumferential groove 13.

In above-mentioned 1st and the 7th embodiment, the 1st gap 25 is formed at the periphery of vane rings 19 and the interior of outer girdle 22 Between week.But, in the occasion of the pump 1 being not provided with vane rings 19, it is possible to the 1st gap 25 is formed at impeller 16 entrance 17 side with Between outer girdle 22.It addition, in the occasion of the pump 1 being not provided with outer girdle 22, it is possible to the 1st gap 25 is formed at vane rings 19 with Between the separating part 23 of housing main body 21.Additionally, in the occasion being not provided with vane rings 19 and the pump 1 of outer girdle 22, it is possible to by the 1st Gap 25 is formed between entrance 17 side of impeller 16 and the separating part 23 of housing main body 21.

In above-mentioned 7th embodiment, as shown in figure 16, although by the 1st and the 2nd axle water shutoff supply hole 61,62 and outside Pipe arrangement 63 is located on the segmentation shell body 36 on top, but may be alternatively provided on the segmentation shell body 35 of bottom.

If it addition, the outside of outside pipe arrangement 63 shell 2, then may be alternatively provided on any position.Such as, it is possible on top On the top of segmentation shell body 36 etc., outside pipe arrangement 63 is set.

(the 8th embodiment)

Below, with reference to Figure 17, Figure 18, the 8th embodiment is described.

In the 8th embodiment, impeller 70 is open shape, and outer girdle 71 surrounds impeller 70 ground and is embedded in housing main body 21 On separating part 23.

Outer girdle 71 has: the 1st ring portion 71a in suction chamber 6；The 2nd ring portion 71b in discharge chamber 5；And 3rd ring portion 71c relative with the periphery of impeller 70.1st and the 2nd ring portion 71a, 71b are utilized respectively multiple screw 72 and and shell The separating part 23 of main body 21 connects fixing.Outside between the 2nd ring portion 71b and the separating part 23 of housing main body 21 of girdle 71, The all-round circular gap 73 being formed and connect in discharge chamber 5.

The composition surface 38 of the bottom of the segmentation shell body 35 in bottom, is formed and from gap 73, axle water shutoff W is supplied to axle The axle water shutoff feed trough 46 (example of axle water shutoff feed path) in envelope portion 9.The one end of axle water shutoff feed trough 46 and gap 73 Connection, the other end connects with the circumferential groove 13 of ring for the sealing liquid 11.It addition, axle water shutoff feed trough 46 is by two segmentation shell bodies 35, under the state after 36 separation, the cross section of upper surface open is tetragonal groove.Two segmentation shell bodies 35,36 are being coupled together State under, the upper surface of axle water shutoff feed trough 46 is closed by the composition surface 40 on top.It addition, set in axle water shutoff feed trough 46 There is square component with small hole 52.

Below, the effect of said structure is described.

In pump 1 runs, a part of water in discharge chamber 5 passes through gap 73, from gap 73 through axle as axle water shutoff W Water shutoff feed trough 46 and arrive the circumferential groove 13 of ring for the sealing liquid 11, be supplied to internal circle groove 12 from circumferential groove 13 by intercommunicating pore 14. Due to axle water shutoff W because of in gap 73 flowing time produce crushing and be depressurized, therefore, can reduce under the pressure making axle water shutoff W Drop to be most suitable for the number of the component with small hole 52 required for the pressure that axle seals.

In above-mentioned 8th embodiment, as shown in figure 17, although axle water shutoff feed trough 46 is formed at the segmentation shell of bottom On the composition surface 38 of body 35, but also may be formed on the composition surface 40 of segmentation shell body 36 on top.

In the respective embodiments described above, as shown in Figure 5, although be made up of axle envelope portion 9 gland liner 10 and ring for the sealing liquid 11, but It is not limited to this structure, the most also can be made up of axle envelope portion 9 mechanical sealing member etc..

In the respective embodiments described above, enumerate the double suction centrifugal pump 1 example as pump, but may also be the most multistage list Inhale the pump of other form of centrifugal pump etc..

In the respective embodiments described above, enumerate a water example as the use fluid to double suction centrifugal pump 1, but may also be Liquid than water.

In the respective embodiments described above, as shown in Figure 1, although shell 2 is divided into the bottom of two parts and dividing of top Cut shell body, but also may be partitioned into the multiple of more than three parts.

In the respective embodiments described above, although the cross sectional shape of axle water shutoff feed trough 46 is made to the other end from one end Identical shape, but also can on the way change cross sectional shape.Such as, it is possible to a part of shape of axle water shutoff feed trough 46 is done greatly And form aperture Embedded Division, embed fixing component with small hole 52 at aperture Embedded Division, so that component with small hole 52 does not supplies to axle water shutoff The length direction of groove 46 moves.

In the respective embodiments described above, although implement perforate processing by external girdle 22 and runner 31 is taken out in axle water shutoff It is formed on outer girdle 22, but outer girdle 22 also can be made the partition type structure being made up of multiple partition type rings, at partition type Gap is set between ring, this gap is used as axle water shutoff and takes out runner.Such as, it is possible to outer girdle 22 is divided at axis direction C Be slit into two parts: the partition type ring of a side and the partition type ring of the opposing party, and will be formed in these a side partition type ring with Runner is taken out as axle water shutoff in gap between the partition type ring of the opposing party.

In above-mentioned 1st～the 7th embodiment, as shown in Fig. 6, Figure 16, although the 1st gap 25 is formed at as far as possible close to inhaling Enter the room 6 position, but the 1st gap 25 also can be made to be formed at slightly near the position of discharge chamber 5 side.It addition, the 8th shown in Figure 18 The gap 73 of embodiment also can be likewise formed at slightly near the position of discharge chamber 5 side.

Claims (14)

1. a pump, impeller sets on the rotary shaft and is contained in the enclosure, this impeller have the entrance connected with suction chamber and The outlet connected with discharge chamber, this pump has the axle envelope portion sealed between rotary shaft and shell, and this pump is characterised by,

Shell is formed as surrounding around impeller,

It is formed with, between the entrance side and shell of impeller, the 1st gap connected by suction chamber with discharge chamber,

It is provided with axle water shutoff from the axle water shutoff feed path of the 1st gap supply to axle envelope portion.

2. pump as claimed in claim 1, it is characterised in that shell has the housing main body of storage impeller and by impeller The outer girdle that entrance side periphery surrounds,

1st gap is formed between the entrance side periphery of impeller and the inner circumferential of outer girdle.

3. pump as claimed in claim 2, it is characterised in that outer girdle embeds housing main body,

The 2nd gap it is formed with outside between girdle and housing main body,

It is formed with the axle water shutoff connected with the 1st gap and the 2nd gap outside on girdle and takes out runner,

Runner and a part for the 2nd gap composition axle water shutoff feed path are taken out in axle water shutoff.

4. pump as claimed in claim 3, it is characterised in that of the circumference between periphery and the housing main body of girdle outside Divide or all-round, be formed with the 2nd gap.

5. pump as claimed in claim 3, it is characterised in that multiple positions of the circumference of girdle are formed with axle water shutoff taking-up outside Runner.

6. pump as claimed in claim 4, it is characterised in that multiple positions of the circumference of girdle are formed with axle water shutoff taking-up outside Runner.

7. the pump as according to any one of claim 1 to claim 6, it is characterised in that will be by axle water shutoff feed path The discharge path discharged of the remainder of axle water shutoff from axle water shutoff feed path difference and connect with suction chamber.

8. the pump as according to any one of claim 1 to claim 6, it is characterised in that set on axle water shutoff feed path There is decompressing unit.

9. pump as claimed in claim 7, it is characterised in that be provided with decompressing unit on axle water shutoff feed path.

10. the pump as according to any one of claim 1 to claim 6, it is characterised in that shell is divided into and has joint Multiple segmentation shell bodies in face,

Respectively segmentation shell body is by connecting engaging between composition surface,

It is formed with axle water shutoff feed trough on the composition surface of arbitrary segmentation shell body,

Axle water shutoff feed trough constitutes a part for axle water shutoff feed path.

11. pumps as according to any one of claim 2 to claim 6, it is characterised in that shell is divided into and has joint Multiple segmentation shell bodies in face,

Respectively segmentation shell body is by connecting engaging between composition surface,

Axle water shutoff feed path has: the axle water shutoff feed trough being formed on the composition surface of arbitrary segmentation shell body；And formed Runner is taken out in axle water shutoff on girdle outside,

The cross section of fluid channel of axle water shutoff taking-up runner amasss the cross section of fluid channel of the end being different from axle water shutoff feed trough and amasss.

12. pumps as according to any one of claim 1 to claim 6, it is characterised in that this pump is double suction centrifugal pump.

13. 1 kinds of pumps, impeller sets on the rotary shaft and is contained in the enclosure, and liquid is delivered to discharge by this impeller from suction chamber Room, this pump has the axle envelope portion that will be sealed between rotary shaft and shell, and this pump is characterised by,

Shell has the housing main body of storage impeller and the outer girdle relative with impeller,

Outer girdle embeds in housing main body,

The gap connected with discharge chamber it is formed with outside between girdle with housing main body,

It is provided with axle water shutoff from the axle water shutoff feed path of gap supply to axle envelope portion.

14. pumps as claimed in claim 13, it is characterised in that this pump is double suction centrifugal pump.