CN212250476U - Vertical back flush water pump for nuclear power - Google Patents
Vertical back flush water pump for nuclear power Download PDFInfo
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- CN212250476U CN212250476U CN202020793499.7U CN202020793499U CN212250476U CN 212250476 U CN212250476 U CN 212250476U CN 202020793499 U CN202020793499 U CN 202020793499U CN 212250476 U CN212250476 U CN 212250476U
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Abstract
The utility model relates to the technical field of vertical pumps, and discloses a vertical back-flushing water pump for nuclear power, which comprises a pump cover and a pump body which are fixed with each other, wherein the pump body is hollow to form a pump cavity, the pump cover is rotatably connected with a pump shaft, the bottom of the pump body is provided with a pump inlet, and the pump inlet is communicated with the pump cavity; the upper end of the pump shaft is rotatably connected with the pump cover, and the lower end of the pump shaft is restrained at the pump inlet through a friction pair. This scheme of adoption can solve prior art's vertical pump poor stability, the not good technical problem of anti-seismic performance.
Description
Technical Field
The utility model relates to a technical field of vertical pump, concretely relates to vertical back flush water pump for nuclear power.
Background
The vertical volute pump generally has two structures, one is a vertical double-suction open-in-the-middle structure, and comprises a pump body, a pump cover, an impeller, a shaft, a sealing body, a shaft sleeve, a bearing body part, a sealing part and the like, wherein the pump body and the pump cover form a vertically symmetrical shape by taking the center line of the impeller as a reference, a water outlet volute is double-layer, and an inlet and an outlet of the pump are arranged on the same side of the open surface in the pump; the impeller is single-stage double-suction type, the bearings are lubricated by grease, and the centrifugal pump is mainly used in the fields of water plants, petroleum, chemical industry and the like; the second is vertical single-suction type, vertical suction and horizontal discharge, at present, a bearing is generally arranged at the upper end and the middle part of a pump shaft to connect and limit the pump shaft and a pump shell, but the main load of the pump shaft is at the lower end part of the pump shaft, so the arrangement mode causes the lower end of the pump shaft to easily generate radial run-out, the running stability of the pump shaft is reduced, and the problems of poor running stability and insufficient anti-seismic performance of the pump are caused; moreover, the bearing located in the middle of the pump shaft is in a middle sealing environment, heat dissipation of the bearing is not facilitated, the pump shell needs to be manually disassembled regularly to lubricate the bearing, and therefore production efficiency can be reduced.
SUMMERY OF THE UTILITY MODEL
The utility model provides a vertical back flush water pump for nuclear power to solve prior art's vertical pump poor stability, the not good technical problem of anti-seismic performance.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a vertical backwashing water pump for nuclear power comprises a pump cover and a pump body, wherein the pump body is hollow to form a pump cavity, a pump shaft is rotatably arranged on the pump body, a pump inlet is formed in the bottom of the pump body, and the pump inlet is communicated with the pump cavity; the upper end of the pump shaft is rotatably connected with the pump cover, and the lower end of the pump shaft is restrained at the pump inlet through a friction pair.
The principle and the advantages of the scheme are as follows: the pump inlet of the scheme is arranged at the bottom of the pump body, so that the lower end part of the pump shaft can be directly accommodated in the pump inlet, and meanwhile, the lower end of the pump shaft is restrained at the pump inlet through the friction pair, so that firstly, the height of the pump body is shortened, the overall operation of the pump is more stable, secondly, the lower end of the pump shaft is limited through the pump body and the friction pair, the radial run-out of the lower end of the pump shaft is reduced, and the operation of the pump shaft is more stable; moreover, the main load of the pump shaft is located in the middle of the pump shaft, the two ends of the pump shaft are limited by the pump cover and the pump body respectively, the radial runout of the pump shaft is further reduced, the rotation stability of the pump shaft is improved, and the operation stability and the anti-seismic performance of the pump are further improved.
Preferably, as an improvement, a sealing member is provided between the pump shaft and the pump cover.
Because pump shaft and pump cover rotate to be connected and pass the pump cover and extend to the pump body outside, make to have certain clearance between axle and the pump cover, lead to the leakproofness of pump to reduce, the sealing member of this scheme can not only fill the gap between pump shaft and the pump cover and seal, can also further prescribe a limit to the radial of pump shaft to reduce the beating of pump shaft, further improve equipment's anti-seismic performance.
Preferably, as an improvement, the sealing member is a key-driven mechanical sealing member.
The existing machine seal shaft sleeve generally adopts a clamp locking and screw locking mode, and when corrosive media such as seawater are pumped, the clamp and the screw are easily corroded by the seawater to cause the locking failure; this scheme adopts key driven mode to carry out mechanical seal, can effectively avoid being corroded by the medium because of clamp and screw and lead to the condition of locking inefficacy, so this scheme life is longer under the environment of pump sending corrosive medium.
Preferably, as an improvement, the friction pair comprises a dynamic friction piece and a static friction piece which are sleeved with each other in a sliding manner, the dynamic friction piece and the pump shaft are coaxially fixed, the static friction piece is fixed with the pump body, and a gap is reserved between the dynamic friction piece and the static friction piece.
When the pump shaft rotates, water flow can enter a gap between the dynamic friction piece and the static friction piece to form a water film, so that the effect of water lubrication is achieved, and the dynamic friction piece and the static friction piece are protected; and the water flow can also take away the heat energy generated when the friction pair rotates relatively, so that the dynamic friction piece and the static friction piece are cooled, and the condition that the pump shaft runs because the dynamic friction piece and the static friction piece rub with each other to generate heat is avoided.
Preferably, as an improvement, a plurality of water conservancy diversion muscle are fixed to be equipped with on the pump body, and the water conservancy diversion muscle is located pump inlet department, and a plurality of water conservancy diversion muscle are evenly located the pump shaft all around, and the water conservancy diversion muscle is fixed with the static friction piece.
In the scheme, the guide ribs support the static friction piece, so that the static friction piece and the dynamic friction piece form a friction pair together, the condition that the lower end of the pump shaft is in radial run-out relative to the pump shell is avoided, and the running stability of the pump shaft is improved; and the guide ribs are positioned at the inlet of the pump, so that the condition that fluid forms vortex at the position can be avoided.
Preferably, as an improvement, the flow guiding ribs are of a streamline structure.
This scheme more is favorable to leading rivers, improves water conservancy efficiency.
Preferably, as an improvement, a suspension separator is fixedly arranged on the pump body, the suspension separator comprises a cone body and a gland which are mutually fixed, the interior of the cone body is hollow, and the cone body is communicated with the pump cavity through a water inlet; a water return port for discharging impurities is arranged at the bottom of the cone; the top of centrum is equipped with the cross bore, is equipped with the overflow mouth on the pump body, and the one end of overflow mouth is passed through cross bore and centrum and is communicate in inside, and the other end of overflow mouth sets up towards seal part.
The suspension separator of this scheme can be with the partial rivers drainage in the pump chamber to the centrum in, carry out the suspension separation, make the impurity in the medium flow through the return water mouth, then make the pure medium after the separation rush to sealing member through the overflow mouth, cool off sealing member, avoid the condition that sealing member rotational friction generates heat.
Preferably, as an improvement, the pump body is fixedly provided with a plurality of reinforcing ribs, and the reinforcing ribs are provided with lifting holes.
The lifting operation of the whole pump is convenient to carry out, and the installation of the whole pump is facilitated.
Preferably, as an improvement, the fixed boss that is equipped with of lower extreme of static friction spare, the lower extreme of water conservancy diversion muscle be equipped with boss complex breach.
The boss can be matched with the notch on the flow guide rib, so that the static friction piece and the flow guide rib are fixed more stably; meanwhile, when workers maintain the pump conveniently, the static friction piece is detached from the pump shell.
Preferably, as an improvement, the upper end sleeve of the pump shaft is provided with a bearing, and an outer ring of the bearing is fixed with the pump cover.
The bearing of this scheme can carry on spacingly to the upper end of pump shaft, reduces the pump shaft and produces the condition of run-out when rotating.
Drawings
Fig. 1 is a front sectional view of a first embodiment of a vertical backwashing water pump for nuclear power of the present invention.
Fig. 2 is a partial enlarged view of a portion B in fig. 1, and mainly shows a specific structure of a sealing member between the pump shaft and the pump cover.
Fig. 3 is a partial enlarged view of a portion a in fig. 1, and mainly shows the positional relationship of the dynamic friction member, the static friction member, and the pump shaft.
Fig. 4 is a sectional view of the air guide rib of fig. 3 along the direction a-a.
Fig. 5 is a front sectional view of a second embodiment of the present invention.
Fig. 6 is a top view of the second embodiment of the present invention.
Fig. 7 is a front sectional view of a third embodiment of the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the pump cover comprises a pump cover 1, a pump body 2, a pump cavity 3, a pump inlet 4, a pump outlet 5, a pump shaft 6, a machine seal shaft sleeve 7, a bearing part 8, a bearing 9, a bearing gland 10, a dynamic friction piece 11, a static friction piece 12, a flow guide rib 13, a boss 14, an impeller 15, a reinforcing rib 16, a reinforcing rib plate 17, a lifting hole 18, a cone 19, a gland 20, a water inlet 21, a water return port 22, an overflow port 23, a key groove 24, an impeller key 25, a sealing sleeve 26, a sealing piece 27, a pressing sealing piece 28, a pressing sleeve 29, a blind hole 30, a plug pin 31 and an elastic buffer piece 32.
Example one
As shown in figure 1: the utility model provides a vertical back flush water pump for nuclear power, includes pump cover 1 and the pump body 2 through bolt reciprocal anchorage, the inside cavity of the pump body 2 forms pump chamber 3, rotates on the pump body 2 and is connected with pump shaft 6, and the bottom of the pump body 2 is equipped with pump inlet 4, and the left side of the pump body 2 is equipped with pump outlet 5, and pump inlet 4, pump chamber 3 and pump outlet 5 are linked together.
As shown in fig. 1, the upper end of the pump cover 1 is fixedly connected with a bearing part 8 through a bolt, a bearing 9 is fixedly clamped in the bearing part 8, the bearing 9 is a pair of ball bearings 9, the upper end of the pump shaft 6 passes through the inner ring of the bearing 9 and is connected with the output end of the motor through a coupler, and the pump shaft 6 is in interference fit with the inner ring of the bearing 9; the bearing part 8 is fixedly connected with a bearing gland 10 through bolts, and is used for preventing the bearing 9 from axially jumping.
As shown in fig. 2, the pump shaft 6 is fixedly provided with an impeller 15 in a clamping manner, specifically, the pump shaft 6 is provided with a key groove 24, the impeller 15 is integrally formed with an impeller key 25 matched with the key groove 24, and the pump shaft 6 and the impeller 15 are fixed by clamping and matching the impeller key 25 and the key groove 24; a sealing component is arranged between the pump shaft 6 and the pump cover 1, and here, taking key transmission type mechanical sealing as an example, as shown in fig. 2 specifically, a sealing sleeve 26 is further arranged on the upper side of the impeller 15, the sealing sleeve 26 is sleeved on the pump shaft 6, a convex key matched with the key groove 24 is integrally formed on the sealing sleeve 26, and the impeller key 25 and the convex key are simultaneously in clamping fit with the key groove 24. The upper end of the sealing sleeve 26 is fixedly provided with a sealing element 27 in a clamping manner, the upper side of the sealing element 27 is provided with a abutting sealing element 28 for abutting and sealing with the sealing element 27, the upper side of the sealing element 27 is also provided with a pressing sleeve 29 for installing the abutting sealing element 28, the pressing sleeve 29 is sleeved on the periphery of the pump shaft 6 and is coaxially arranged with the pump shaft 6, and the abutting sealing element 28 is fixedly arranged on the lower end face of the pressing sleeve 29 in a clamping manner; the upper side of the pressing external member 29 is provided with a machine seal shaft sleeve 7, the machine seal shaft sleeve 7 is fixed with the pump cover 1 through a bolt, a blind hole 30 is formed in the machine seal shaft sleeve 7, a bolt 31 is fixedly clamped on the pressing external member 29, and the upper end of the bolt 31 is inserted into the blind hole 30 and is in sliding fit with the blind hole 30 along the axial direction. An elastic buffer 32 is further welded and fixed on the mechanical seal shaft sleeve 7, and a compression spring is taken as an example for explanation here, the lower end of the compression spring abuts against the compression sleeve 29 to provide a downward extrusion effect for the compression sleeve 29, so that the compression sleeve 29 pushes the abutting sealing element 28 downward, and the abutting sealing element 28 and the sealing element 27 abut against each other to achieve the purpose of sealing.
As shown in fig. 3, the lower end of the pump shaft 6 is constrained at the pump inlet 4 through a friction pair, specifically, the friction pair includes a dynamic friction member 11 and a static friction member 12, the dynamic friction member 11 is located at the pump inlet 4, the dynamic friction member 11 is sleeved on the periphery of the pump shaft 6 and is in interference fit with the outer peripheral wall of the pump shaft 6, the static friction member 12 is fixedly clamped on the pump body 2, specifically, a plurality of flow guide ribs 13 are fixedly clamped on the position, close to the pump inlet 4, on the pump body 2, four flow guide ribs 13 are taken as an example, the four flow guide ribs 13 are circumferentially distributed around the pump shaft 6 with the pump shaft 6 as a center, and the longitudinal section of the flow guide ribs 13 is in a streamline shape shown in fig. 4; the static friction piece 12 is arranged among the four flow guide ribs 13, and the outer peripheral wall of the static friction piece 12 is in interference fit with the flow guide ribs 13; the static friction piece 12 is in sliding fit with the dynamic friction piece 11, and a gap is reserved between the dynamic friction piece 11 and the static friction piece 12. As shown in fig. 3, a boss 14 is integrally formed at the lower end of the static friction member 12, and a notch having the same size and shape as the boss 14 is formed at the lower end of the flow guide rib 13, so that the boss 14 is in interference fit with the notch.
As shown in fig. 1, the pump body 2 is further welded and fixed with a plurality of reinforcing ribs 16, here eight reinforcing ribs are taken as an example, and the eight reinforcing ribs 16 are uniformly located around the pump body 2.
The specific implementation process is as follows: the pump shaft 6 rotates to drive the impeller 15 to rotate, negative pressure is formed at the position of the pump inlet 4, medium is sucked into the pump cavity 3, and then the medium is pumped away along the direction of the pump outlet 5, so that the purposes of providing unidirectional power for the medium and pumping the medium to a required position are achieved.
The pump inlet 4 of the scheme is arranged at the bottom of the pump body 2, so that the lower end part of the pump shaft 6 can be directly accommodated at the position of the pump inlet 4, the height of the pump body 2 is shortened, and the overall operation of the pump is more stable; meanwhile, the lower end of the pump shaft 6 is restrained at the pump inlet 4 through a friction pair, so that the lower end of the pump shaft 6 is limited by the friction pair and the pump body 2, the radial run-out of the lower end of the pump shaft 6 is reduced, and the operation of the pump shaft 6 is more stable; moreover, the main load of the pump shaft 6 is located in the middle of the pump shaft 6, the two ends of the pump shaft 6 are limited by the pump cover 1 and the pump body 2 respectively, the radial runout of the pump shaft 6 is further reduced, the rotation stability of the pump shaft 6 is improved, and the operation stability and the anti-seismic performance of the pump are further improved.
When the pump shaft 6 rotates, water flow can enter a gap between the dynamic friction piece 11 and the static friction piece 12 to form a water film, so that the water lubrication effect is achieved, and the dynamic friction piece 11 and the static friction piece 12 are protected; moreover, the water flow can also take away the heat energy generated when the dynamic friction piece 11 and the static friction piece 12 rotate relatively, so that the dynamic friction piece 11 and the static friction piece 12 are cooled, and the condition that the pump shaft 6 is influenced by the mutual friction and heat generation of the dynamic friction piece 11 and the static friction piece 12 is avoided.
The flow guide ribs 13 can support the static friction piece 12, so that the static friction piece 12 and the dynamic friction piece 11 form a friction pair together, a supporting and limiting effect is provided for the pump shaft 6, the condition that the lower end of the pump shaft 6 is in radial jumping relative to a pump shell is avoided, and the operation stability of the pump shaft 6 is improved; the water conservancy diversion muscle 13 is located the position of pump import 4, can also carry out the refluence to fluid medium's flow direction, avoids the fluid to rotate because of the negative pressure in pump import 4 department to avoided the fluid to form the condition of vortex in this department, the water conservancy diversion muscle 13 of this scheme adopts streamlined structure moreover, more is favorable to leading rivers, improves water conservancy efficiency.
When the pump shaft 6 rotates, the sealing sleeve 26 is driven to rotate together, and the sealing sleeve 26 drives the sealing element 27 to rotate together; meanwhile, the pressing sleeve member 29 is fixed with the pump cover 1 through the mechanical seal shaft sleeve 7, so that the pressing sleeve member 29 cannot rotate along with the pump shaft 6, the abutting sealing member 28 fixed on the pressing sleeve member 29 cannot rotate along with the pump shaft 6, however, the abutting sealing member 28 and the sealing member 27 always keep abutting states, the sealing performance of the connecting part of the pump shaft 6 and the pump cover 1 is improved, and the normal operation of the pump is guaranteed.
Mechanical seal is realized between pump shaft 6 of this scheme and pump cover 1 by adopting key drive's mode, can not appear traditional mechanical seal structure, and clamp and screw are corroded by the sea water and lead to the condition of locking inefficacy, so the life of this scheme is longer.
Example two
As shown in fig. 5, the difference between the present embodiment and the first embodiment is that a plurality of reinforcing rib plates 17 are integrally formed on the pump body 2, and lifting holes 18 are formed on the reinforcing rib plates 17; taking ten reinforcing rib plates 17 as an example, the distribution of ten reinforcing rib plates 17 is shown in fig. 6. In the use process, the reinforcing ribs 16 and the lifting holes 18 are convenient for fixing and lifting the whole pump, so that the whole pump can be conveniently disassembled and assembled.
EXAMPLE III
As shown in fig. 7, the difference between the present embodiment and the first embodiment is that a suspension separator is fixedly arranged on the pump body 2, the suspension separator includes a cone 19 and a gland 20 which are fixed to each other, specifically, a chamber for accommodating the cone 19 is arranged on the pump body 2, a tapered hole with the same shape and size as the lower end of the cone 19 is arranged at the bottom of the chamber, and the lower end of the cone 19 is in transition fit with the tapered hole; the gland 20 is located on the upper side of the cone 19 and tightly abuts against the upper end of the cone 19, and the gland 20 is fixed with the pump body 2 through bolts, so that the cone 19 is tightly pressed and fixed in the pump body 2. A water inlet 21 is arranged on the pump body 2, the left end of the water inlet 21 is communicated with the pump cavity 3, and the water inlet 21 is positioned on the left side of the cone 19; the interior of the vertebral body 19 is hollow, an opening is arranged on the left side wall of the vertebral body 19, and the right end of the water inlet 21 is communicated with the interior of the vertebral body 19 through the opening; the bottom of the cone 19 is provided with a water return port 22 for discharging impurities, and the water return port 22 is communicated with the outside; the gland 20 is provided with a transverse hole, the pump body 2 is provided with an overflow port 23, the right end of the overflow port 23 is communicated with the inside of the cone 19 through the transverse hole, and the left end of the overflow port 23 is arranged towards the mechanical seal shaft sleeve 7.
The specific implementation process is as follows: after entering the pump cavity 3 from the pump inlet 4, the medium enters the cone 19 through the water inlet 21 in the tangential direction, rotates to generate centrifugal force, and rotates more violently after descending to the conical part; the solid particles or the liquid with larger density in the medium are thrown to the wall of the device under the action of centrifugal force and flow down to the water return port 22 along the wall of the device according to a spiral line; the clarified medium rises and flows to the overflow port 23 through a channel in the center of the gland 20, so that the mechanical seal shaft sleeve 7 is washed and cooled, and the influence on normal operation caused by frictional heat generation in the rotation process of the mechanical seal shaft sleeve 7 is avoided. After cooling the mechanical seal shaft sleeve 7, the medium flows back into the pump cavity 3 again under the action of gravity and is pumped out along the pump outlet 5 under the action of the impeller 15.
The above description is only an example of the present invention, and the detailed technical solutions and/or characteristics known in the solutions are not described too much here. It should be noted that, for those skilled in the art, without departing from the technical solution of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. The utility model provides a vertical back flush water pump for nuclear power, includes pump cover and pump body, the inside cavity of pump body forms the pump chamber, rotates on the pump body to be equipped with pump shaft, its characterized in that: the bottom of the pump body is provided with a pump inlet which is communicated with the pump cavity; the upper end of the pump shaft is rotatably connected with the pump cover, and the lower end of the pump shaft is restrained at the pump inlet through a friction pair.
2. The vertical backwashing water pump for nuclear power of claim 1, characterized in that: and a sealing part is arranged between the pump shaft and the pump cover.
3. The vertical backwashing water pump for nuclear power of claim 2, characterized in that: the sealing component adopts a key transmission type mechanical sealing component.
4. The vertical backwashing water pump for nuclear power of claim 1, characterized in that: the friction pair comprises a dynamic friction piece and a static friction piece which are sleeved with each other in a sliding mode, the dynamic friction piece and the pump shaft are coaxially fixed, the static friction piece and the pump body are fixed, and a gap is reserved between the dynamic friction piece and the static friction piece.
5. The vertical backwashing water pump for nuclear power of claim 4, characterized in that: the pump body is fixedly provided with a plurality of flow guide ribs, the flow guide ribs are positioned at the inlet of the pump, the flow guide ribs are uniformly arranged on the periphery of the pump shaft, and the flow guide ribs are fixed with the static friction piece.
6. The vertical backwashing water pump for nuclear power of claim 5, characterized in that: the flow guide ribs are of a streamline structure.
7. The vertical backwashing water pump for nuclear power of claim 2, characterized in that: the pump body is fixedly provided with a suspension separator, the suspension separator comprises a cone body and a gland which are mutually fixed, the interior of the cone body is hollow, and the cone body is communicated with the pump cavity through a water inlet; a water return port for discharging impurities is arranged at the bottom of the cone; the top of centrum is equipped with the cross bore, is equipped with the overflow mouth on the pump body, and the one end of overflow mouth is passed through cross bore and centrum and is communicate in inside, and the other end of overflow mouth sets up towards seal part.
8. The vertical backwashing water pump for nuclear power of claim 1, characterized in that: the pump body is fixedly provided with a plurality of reinforcing ribs, and the reinforcing ribs are provided with lifting holes.
9. The vertical backwashing water pump for nuclear power of claim 5, characterized in that: the lower extreme of static friction spare is fixed and is equipped with the boss, and the lower extreme of water conservancy diversion muscle is equipped with the breach with boss complex.
10. The vertical backwashing water pump for nuclear power of claim 1, characterized in that: the upper end cover of pump shaft is equipped with the bearing, and the outer lane of bearing is fixed with the pump cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020793499.7U CN212250476U (en) | 2020-05-13 | 2020-05-13 | Vertical back flush water pump for nuclear power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020793499.7U CN212250476U (en) | 2020-05-13 | 2020-05-13 | Vertical back flush water pump for nuclear power |
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| Publication Number | Publication Date |
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| CN212250476U true CN212250476U (en) | 2020-12-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020793499.7U Active CN212250476U (en) | 2020-05-13 | 2020-05-13 | Vertical back flush water pump for nuclear power |
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| CN (1) | CN212250476U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022189489A1 (en) * | 2021-03-10 | 2022-09-15 | KSB SE & Co. KGaA | Centrifugal pump having inlet fins |
-
2020
- 2020-05-13 CN CN202020793499.7U patent/CN212250476U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022189489A1 (en) * | 2021-03-10 | 2022-09-15 | KSB SE & Co. KGaA | Centrifugal pump having inlet fins |
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