CN220600060U - Single-stage centrifugal pump capable of balancing axial force - Google Patents
Single-stage centrifugal pump capable of balancing axial force Download PDFInfo
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- CN220600060U CN220600060U CN202320725938.4U CN202320725938U CN220600060U CN 220600060 U CN220600060 U CN 220600060U CN 202320725938 U CN202320725938 U CN 202320725938U CN 220600060 U CN220600060 U CN 220600060U
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- impeller
- pump
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- axial force
- stage centrifugal
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- 230000000149 penetrating effect Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 19
- 239000007788 liquid Substances 0.000 abstract description 17
- 238000000034 method Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Abstract
The utility model discloses a single-stage centrifugal pump capable of balancing axial force, and relates to the technical field of water pumps. The utility model comprises a pump body, an impeller assembly and a pump shaft, wherein the impeller assembly comprises an impeller; the pump shaft is rotatably arranged in the pump body, and the impeller assembly is arranged on the pump shaft; and the balance cavities are arranged between the impeller assembly and the pump shaft. The balance cavity comprises a first runner, a second runner and a third runner which are sequentially connected, so that the high-pressure area on the back surface of the impeller rear cover plate is communicated with the inlet of the impeller blade; the utility model provides a centrifugal pump with high cavitation resistance, which changes the flow mode of high-pressure liquid with balanced axial force by changing the position of a balancing cavity, prevents bubbles from being generated at the inlet of an impeller blade, and further improves the cavitation resistance of the water pump.
Description
Technical Field
The utility model relates to the technical field of water pumps, in particular to a single-stage centrifugal pump capable of balancing axial force.
Background
In the prior art, a single-stage centrifugal pump is often configured on an impeller to balance axial force by using a balance hole, the flow direction at the balance hole is greatly different from the flow direction at the inlet of an impeller blade, so that the normal flow state is damaged, and the cavitation resistance of the water pump is reduced, wherein cavitation refers to the process that if the water pump is in operation, if the absolute pressure of liquid in a local area of an overflow part (usually a part at a later position of the inlet of the impeller blade) is lower than the vaporization pressure, vapor bubbles are generated by vaporization, and the vapor bubbles break and condense to damage an overflow part after entering a high-pressure area.
Chinese patent publication No. CN105134666A, publication No. 2015, 12-month 09, discloses an anti-cavitation centrifugal pump, which mainly solves the problems of larger volume and higher installation requirement of the existing anti-cavitation centrifugal pump. The anti-cavitation centrifugal pump comprises a centrifugal impeller, a shell, an inlet pipe and a main shaft, wherein the centrifugal impeller is arranged on the main shaft and is positioned in the shell, an axial flow impeller is arranged in front of the centrifugal impeller and is arranged on the main shaft, the axial flow impeller comprises at least two blades and a hub, and the blades are arranged on the hub, are positioned at the same axial position and are uniformly distributed along the circumference of the hub. It has the disadvantage of low cavitation resistance.
Disclosure of Invention
The utility model overcomes the defect that the cavitation resistance of the water pump is reduced due to the balance axial force of the single-stage centrifugal pump in the prior art, and provides the single-stage centrifugal pump capable of balancing the axial force.
In order to solve the technical problems, the utility model adopts the following technical scheme: a single-stage centrifugal pump capable of balancing axial force comprises a pump body and an impeller assembly arranged in the pump body; the pump shaft is rotationally arranged in the pump body, and the impeller assembly is arranged on the pump shaft; and the balance cavities are arranged between the impeller assembly and the pump shaft.
The utility model provides a single-stage centrifugal pump capable of balancing axial force, which changes the flow mode of high-pressure liquid with balanced axial force by changing the position of a balancing cavity, prevents bubbles from being generated at the inlet of impeller blades on an impeller assembly, improves the cavitation resistance of a water pump, and further improves the overall performance of the water pump.
Preferably, the balance cavity comprises a first runner, a second runner and a third runner which are sequentially connected.
The design of the flow channel can lead the high-pressure liquid on the back surface of the impeller back cover plate to reach the inlet edge of the impeller blade through the balance cavity when the water pump works, thereby achieving the purpose of balancing the axial force of the impeller assembly (transferred to the pump shaft).
Preferably, the impeller assembly comprises an impeller hub with an annular structure, the impeller hub is connected to the pump shaft, the second runner is arranged between the pump shaft and the impeller hub, and the first runner is arranged on the impeller hub in a penetrating mode.
The impeller hub is welded with the impeller, and the impeller hub is connected with the pump shaft through a key; the impeller hub is internally provided with a shaft hole for connecting the pump shaft, a plurality of first runner grooves are circumferentially distributed on the inner wall of the shaft hole at equal intervals, and the second runner is formed by matching the first runner grooves with the pump shaft. The design of the second flow passage can balance the axial force generated by the impeller assembly when the water pump operates.
Preferably, the impeller assembly further comprises an impeller, wherein the impeller comprises an impeller rear cover plate, an impeller front cover plate and a plurality of impeller blades, and the impeller rear cover plate is connected with the impeller front cover plate through the impeller blades. The impeller is arranged on the impeller hub, and the impeller rear cover plate is arranged on the impeller hub; the impeller blades can form an impeller runner between the impeller rear cover plate and the impeller front cover plate.
Preferably, an inlet is formed in the pump body, an impeller inlet is formed between the impeller front cover plate and the pump shaft, the inlet is communicated with the impeller inlet, and the first runner is communicated with the impeller inlet. The impeller inlet is communicated with the impeller runner, the impeller outer edge is provided with an impeller outlet, and liquid can be communicated with the impeller inlet through the inlet, the impeller runner and the impeller inlet in sequence.
Preferably, the pump further comprises a motor, a connecting frame is arranged between the motor and the pump body, and one end of the pump shaft is connected to an output shaft of the motor. When the centrifugal pump needs to be started, the motor is started firstly, the output shaft of the motor rotates to drive the pump shaft to rotate, and the pump shaft rotates to drive the impeller hub and the impeller to rotate, so that the rapid operation of the water pump is realized.
Preferably, a pump cover is arranged in the pump body, and a high-pressure area is formed between the pump cover and the back surface of the impeller back cover plate. The high-pressure area is respectively communicated with the impeller flow channel and the balance cavity, so that the axial force generated when the impeller operates is balanced.
Preferably, a shaft seal assembly is arranged between the pump cover and the pump shaft, the third flow passage is arranged between the shaft seal assembly and the impeller hub, and the third flow passage is communicated with the high-pressure area; so that the liquid in the high-pressure area can enter the balance cavity through the third flow channel.
Preferably, a lock nut assembly is arranged at the other end of the pump shaft, which is far away from the motor, and the impeller is arranged between the lock nut assembly and the shaft seal assembly. Plays an axial limiting role on the impeller assembly, and improves the connection strength of the impeller assembly.
Compared with the prior art, the utility model has the beneficial effects that: (1) By changing the position of the balance cavity, the flow mode of the high-pressure water with balanced axial force is changed, so that the generation of bubbles at the inlet of the impeller is prevented, the cavitation resistance of the water pump is improved, and the overall performance of the water pump is improved; (2) The high-pressure liquid on the back of the impeller back cover plate can reach the inlet edge of the impeller through the balance cavity, so that the purpose of balancing the axial force on the impeller (transmitted to the shaft) is achieved.
Drawings
FIG. 1 is a schematic illustration of a single stage centrifugal pump capable of balancing axial forces in accordance with the present utility model;
FIG. 2 is a cross-sectional view of a single stage centrifugal pump of the present utility model;
FIG. 3 is a partial cross-sectional view of a single stage centrifugal pump of the present utility model with aqueous flow direction;
FIG. 4 is a schematic illustration of the impeller assembly and pump shaft combination of the present utility model;
FIG. 5 is a schematic view of a bearing of the impeller assembly of the present utility model;
FIG. 6 is a second schematic bearing view of the impeller assembly of the present utility model;
in the figure: a motor 1; a pump body 2; an impeller assembly 3; a pump shaft 4; a connecting frame 5; a balancing chamber 6; flow channel one 6.1; 6.2 of a second runner; 6.2.1 parts of runner groove I; flow passage III 6.3; 6.3.1 parts of runner groove II; an impeller hub 7; an impeller 8; a shaft hole 10; an impeller back cover plate 11; an impeller front cover plate 12; impeller blades 13; an impeller runner 14; an inlet 15; an impeller inlet 16; an impeller outlet 17; a pump cover 18; a high pressure region 19; a shaft seal assembly 20; a lock nut assembly 21.
Detailed Description
The following further describes the technical scheme of the utility model in detail through specific embodiments and with reference to the accompanying drawings:
example 1: referring to fig. 1 to 6, a single-stage centrifugal pump capable of balancing axial force comprises a motor 1, a pump body 2, an impeller assembly 3 and a pump shaft 4; set up link 5 between motor 1 and the pump body 2, pump shaft 4 rotates and sets up in pump body 2, and the one end of pump shaft 2 is connected on the output shaft of motor 1, and impeller subassembly 3 sets up on pump shaft 4 in pump body 2, and the position is equipped with a plurality of balance chamber 6 between impeller subassembly 3 and the pump shaft 4, and balance chamber 6 is including runner one 6.1, runner two 6.2 and runner three 6.3 that link to each other in proper order.
Referring to fig. 2, 4-6, the impeller assembly 3 comprises an impeller hub 7 with an annular structure and an impeller 8 arranged on the impeller hub 7, wherein the impeller hub 7 is assembled on the pump shaft 4 through a key, a second flow channel 6.2 is arranged between the pump shaft 4 and the impeller hub 7, and a first flow channel 6.1 is arranged on the impeller hub 7 in a penetrating way.
Referring to fig. 2, 4-6, a shaft hole 10 for connecting the pump shaft 4 is arranged in the impeller hub 7, a plurality of first runner grooves 6.2.1 are circumferentially and equidistantly distributed on the inner wall of the shaft hole 10, the second runner 6.2 is formed by matching the first runner grooves 6.2.1 with the pump shaft 4, and the structural design of the second runner 6.2 can balance the axial force generated by the impeller assembly when the water pump operates.
Referring to fig. 4 and 5, the impeller 8 includes a rear impeller cover plate 11, a front impeller cover plate 12 and a plurality of impeller blades 13, which are disposed on the impeller hub 7, the rear impeller cover plate 11 and the front impeller cover plate 12 are connected by the impeller blades 13, and an impeller runner 14 is formed between the rear impeller cover plate 11 and the front impeller cover plate 12 by the impeller blades 13. The impeller flow passage 14 may be used to increase the efficiency of the flow of liquid within the pump body 2.
Referring to fig. 2 and 3, an inlet 15 is formed in the pump body 2, an impeller inlet 16 is formed between the impeller front cover plate 12 and the pump shaft 4, the inlet 15 is communicated with the impeller inlet 16, a first runner 6.1 is communicated with the impeller inlet 16, the impeller inlet 16 is communicated with an impeller runner 14, and an impeller outlet 17 is formed in the outer edge of the impeller 8; a pump cover 18 is arranged in the pump body 2, a high-pressure area 19 is formed between the pump cover 18 and the back surface of the impeller rear cover plate 11, and the high-pressure area 19 is respectively communicated with the impeller runner 14 and the balance cavity 6; a shaft seal assembly 20 is arranged between the pump cover 18 and the pump shaft 4, a plurality of second runner grooves 6.3.1 are formed in the side wall of the impeller hub 7, the third runner 6.3 is formed by combining the second runner grooves 6.3.1 with the shaft seal assembly 20, and the third runner 6.3 is communicated with the high-pressure area 19. The liquid can sequentially pass through the inlet 15, the impeller inlet 16, the impeller runner 14, the impeller outlet 17 and the high-pressure area 19 on the back surface of the impeller rear cover plate 11, and then flows back into the impeller inlet 16 through the balance cavity 6, so that the internal circulation of the pump body 2 of the liquid is realized.
Referring to fig. 2, 3 and 4, the other end of the pump shaft 4, which is far from the motor 1, is provided with a lock nut assembly 21, and the impeller 8 is arranged between the lock nut assembly 21 and the shaft seal assembly 20. Plays an axial limiting role on the impeller assembly 3, and improves the connection strength of the impeller assembly 3.
The working flow is as follows:
referring to fig. 2 and 3, the utility model provides a single-stage centrifugal pump capable of balancing axial force, when a water pump operates, a motor 1 is started, an output shaft of the motor 1 rotates to drive a pump shaft 4 to rotate, and the pump shaft 4 rotates to drive an impeller hub 7 and an impeller 8 to rotate, so that the operation of the water pump is realized; in the running process of the water pump, liquid sequentially passes through the inlet 15, the impeller inlet 16, the impeller runner 14, the impeller outlet 17 and the high-pressure area 19 on the back side of the impeller back cover plate 11 under the action of the rotating impeller 8, and then flows back to the impeller inlet 16 through the balance cavity 6, so that liquid circulation is realized, wherein the high-pressure liquid on the back side of the impeller back cover plate 11 reaches the edge of the impeller inlet 16 through the balance cavity 6, and the purpose of balancing the axial force of the impeller 8 (transmitted to the pump shaft 4) is achieved. Under the action of the balance cavity 6, the outflow direction of the high-pressure liquid on the back surface of the impeller back cover plate 11 is smaller than that of the liquid flow at the impeller inlet 15, and the hydraulic loss caused by the high-pressure liquid is greatly reduced. And the pressure of liquid at the inlet of the impeller 8 is improved, the generation of bubbles is avoided, and the cavitation resistance of the water pump is improved.
The above-described embodiments are merely preferred embodiments of the present utility model, and the present utility model is not limited in any way, and other variations and modifications may be made without departing from the technical aspects set forth in the claims.
Claims (10)
1. A single-stage centrifugal pump capable of balancing axial force is characterized by comprising a pump body and an impeller assembly arranged in the pump body; the pump shaft is rotationally arranged in the pump body, and the impeller assembly is arranged on the pump shaft; and the balance cavities are arranged between the impeller assembly and the pump shaft.
2. The single stage centrifugal pump of claim 1 wherein said balancing chamber comprises a first flow path, a second flow path and a third flow path connected in sequence.
3. The single-stage centrifugal pump capable of balancing axial force according to claim 2, wherein the impeller assembly comprises an impeller hub with an annular structure and an impeller arranged on the impeller hub, the impeller hub is connected to the pump shaft, the second runner is arranged between the pump shaft and the impeller hub, and the first runner is arranged on the impeller hub in a penetrating manner.
4. A single stage centrifugal pump according to claim 2 or 3 wherein said impeller assembly further comprises an impeller comprising an impeller back cover plate, an impeller front cover plate and a plurality of impeller blades, said impeller back cover plate and impeller front cover plate being connected by said impeller blades.
5. The balanced axial force single stage centrifugal pump of claim 4 wherein the pump body has an inlet, an impeller inlet is formed between the impeller front cover plate and the pump shaft, the inlet is in communication with the impeller inlet, and the first flow passage is in communication with the impeller inlet.
6. The single-stage centrifugal pump capable of balancing axial force according to claim 5, further comprising a motor, wherein a connecting frame is arranged between the motor and the pump body, and one end of the pump shaft is connected to an output shaft of the motor.
7. The balanced axial force single stage centrifugal pump of claim 4 wherein a pump cover is disposed within the pump body, a high pressure region being defined between the pump cover and the back of the impeller back cover plate.
8. The balanced axial force single stage centrifugal pump of claim 6 wherein a pump cover is disposed within the pump body, a high pressure region being defined between the pump cover and the back of the impeller back cover plate.
9. The single-stage centrifugal pump capable of balancing axial force according to claim 8, wherein a shaft seal assembly is arranged between the pump cover and the pump shaft, the third flow passage is arranged between the shaft seal assembly and the impeller hub, and the third flow passage is communicated with the high pressure area.
10. The balanced axial force single stage centrifugal pump of claim 9 wherein the pump shaft has a lock nut assembly at the other end remote from the motor, the impeller being disposed between the lock nut assembly and the shaft seal assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320725938.4U CN220600060U (en) | 2023-04-04 | 2023-04-04 | Single-stage centrifugal pump capable of balancing axial force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320725938.4U CN220600060U (en) | 2023-04-04 | 2023-04-04 | Single-stage centrifugal pump capable of balancing axial force |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220600060U true CN220600060U (en) | 2024-03-15 |
Family
ID=90181989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320725938.4U Active CN220600060U (en) | 2023-04-04 | 2023-04-04 | Single-stage centrifugal pump capable of balancing axial force |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220600060U (en) |
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2023
- 2023-04-04 CN CN202320725938.4U patent/CN220600060U/en active Active
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