A multi-stage pump axial cushioning system
By incorporating guide vanes and a spring-loaded buffer system on the pump shaft in a multistage pump, the problem of axial movement during changes in operating conditions is solved, ensuring the safe operation of the multistage pump.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGZHOU XINHENG PUMP MFG
- Filing Date
- 2025-07-14
- Publication Date
- 2026-07-10
AI Technical Summary
When the operating conditions of a multistage pump change, the change in axial force can cause axial movement of the rotor components, posing a safety hazard.
A multi-stage pump axial buffer system is designed by setting first and second springs on the guide vanes and pump shaft, which are connected to the friction ring and bearing respectively, to form elastic buffers in opposite directions and eliminate axial movement.
It effectively eliminates axial movement of rotor components, ensures safe operation of multi-stage pumps, and avoids safety hazards caused by pressure fluctuations.
Smart Images
Figure CN224479095U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of multistage pump technology, and in particular to a multistage pump axial buffer system. Background Technology
[0002] When the operating flow rate of a multistage pump is less than or greater than the design rated flow rate, for example, due to changes in the operating pressure of the pipeline system, changes in the demand flow rate at the output end, changes in the frequency of the power grid system, changes in the head of the pump inlet pipeline system, or stalling or overspeeding of the drive system, pressure fluctuations will occur, causing changes in axial force. Changes in axial force will cause axial movement of the rotor components of the multistage pump, posing a safety hazard to the operation of the multistage pump. Therefore, the technical solution of this application is urgently needed to solve the above problems. Utility Model Content
[0003] The purpose of this invention is to provide an axial buffer system for a multi-stage pump, which can eliminate axial movement of the rotor components and ensure the safe operation of the multi-stage pump.
[0004] To achieve the above objectives, this utility model provides a multi-stage pump axial buffer system, comprising:
[0005] The middle section has guide vanes, and the sidewalls of the guide vanes have first mounting grooves;
[0006] A pump shaft is located in the middle section, and an impeller is provided on the pump shaft. The side wall of the impeller near the guide vane has a friction surface.
[0007] A first spring is disposed in the first mounting slot;
[0008] A friction ring, one side of which is disposed in the first mounting groove and connected to the spring, and the other side of the friction ring extending out of the first mounting groove and abutting against the friction surface; and
[0009] The bearing housing has a second mounting groove on its inner wall, a bearing disposed in the second mounting groove, and a second spring. The bearing is mounted on the outer peripheral wall of the pump shaft, and one end of the second spring abuts against the bearing.
[0010] The first spring exerts a spring force on the friction ring in the opposite direction to the spring force exerted by the second spring on the bearing.
[0011] In some embodiments, the middle section, the first spring, and the impeller are each provided with a plurality of first mounting slots in the plurality of middle sections, friction surfaces of the plurality of first springs, and friction surfaces of the plurality of impellers are provided in a one-to-one correspondence.
[0012] In some embodiments, both the first spring and the second spring are corrugated springs.
[0013] In some embodiments, the bearing is an angular contact ball bearing.
[0014] In some embodiments, the sidewall of the guide vane has two first mounting grooves, which are located at the upper and lower parts of the friction ring, respectively.
[0015] In some embodiments, the axial direction of the friction ring coincides with the axial direction of the impeller.
[0016] In some embodiments, a flow-blocking ring is included, which is mounted on the guide vane and located between the guide vane and the impeller.
[0017] In some embodiments, the flow-blocking ring has a first flow channel arc surface, the guide vane has a second flow channel arc surface, and the first flow channel arc surface and the second flow channel arc surface abut to form a smooth flow channel arc surface.
[0018] In some embodiments, the depth of the first mounting groove is less than the thickness of the friction ring.
[0019] In some embodiments, the compression stroke of the first spring is a, and when the first spring is not under force, the thickness of the friction ring extending out of the first mounting groove is b, then a < b.
[0020] This utility model provides a multi-stage pump axial buffer system, which has the following advantages compared with the prior art:
[0021] The pump has a guide vane in the middle section, and the side wall of the guide vane has a first mounting groove. The pump shaft is located in the middle section and has an impeller on the pump shaft. The side wall of the impeller near the guide vane has a friction surface. A first spring is located in the first mounting groove. One side of the friction ring is located in the first mounting groove and connected to the spring. The other side of the friction ring extends out of the first mounting groove and abuts against the friction surface. The inner wall of the bearing housing has a second mounting groove, a bearing and a second spring located in the second mounting groove. The bearing is installed on the outer peripheral wall of the pump shaft. One end of the second spring abuts against the bearing. The first spring exerts a spring force on the friction ring in the opposite direction to the spring force exerted by the second spring on the bearing. In this way, when the axial force changes during the operation of the multi-stage pump, the first spring and the second spring work together to achieve a buffering effect, which can eliminate the axial movement of the rotor components and ensure the safe operation of the multi-stage pump. Attached Figure Description
[0022] Figure 1 A cross-sectional structural schematic diagram of a multi-stage pump axial buffer system provided in an embodiment of this utility model.
[0023] Figure 2 for Figure 1 A magnified schematic diagram of the structure at point A in the middle.
[0024] Figure 3for Figure 1 A magnified schematic diagram of the structure at point B in the middle.
[0025] In the diagram: 1. Middle section; 11. Guide vane; 111. First mounting groove; 112. Second flow channel arc surface; 2. Pump shaft; 21. Impeller; 211. Friction surface; 3. First spring; 4. Friction ring; 5. Bearing housing; 51. Second mounting groove; 52. Bearing; 53. Second spring; 6. Flow-blocking ring; 61. First flow channel arc surface. Detailed Implementation
[0026] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.
[0027] It should be understood that in the description of this application, the terms "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. That is, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Furthermore, unless otherwise stated, "a plurality of" means two or more.
[0028] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.
[0029] like Figures 1-3 As shown, the multi-stage pump axial buffer system of this utility model embodiment includes: a middle section 1, a pump shaft 2, a first spring 3, a friction ring 4, and a bearing housing 5.
[0030] The middle section 1 has a guide vane 11, and the side wall of the guide vane 11 has a first mounting groove 111.
[0031] Pump shaft 2 is located in the middle section 1, and impeller 21 is provided on pump shaft 2. The side wall of impeller 21 near guide vane 11 has friction surface 211. Specifically, friction surface 211 is annular and protrudes from the side wall of guide vane 11.
[0032] The first spring 3 is disposed in the first mounting groove 111. Specifically, one end of the first spring 3 is fixed to the guide vane 11, and the first spring 3 is entirely located within the first mounting groove 111 when not in use.
[0033] One side of the friction ring 4 is located in the first mounting groove 111 and connected to the spring 3, while the other side of the friction ring 4 extends out of the first mounting groove 111 and abuts against the friction surface 211. In this way, the friction ring 4 can abut against the friction surface 211 to transmit the elastic force of the first spring 3 without affecting the normal rotation of the impeller 21.
[0034] The inner wall of the bearing housing 5 has a second mounting groove 51, a bearing 52 disposed in the second mounting groove 51, and a second spring 53. The bearing 52 is mounted on the outer peripheral wall of the pump shaft 2, and one end of the second spring 53 abuts against the bearing 52. It should be noted that the inner ring of the bearing 52 rotates with the pump shaft 2, and the installation position of the second spring 53 needs to ensure that it does not affect the rotation of the inner ring of the bearing 52. Therefore, one end of the second spring 53 can abut against the outer ring of the bearing 52.
[0035] In this embodiment, the elastic force generated by the first spring 3 on the friction ring 4 is opposite in direction to the elastic force generated by the second spring 53 on the bearing 52. This effectively buffers axial movement in both directions.
[0036] When a multistage pump is running, changes in the operating pressure of the pipeline system, changes in the demand flow at the output terminal, changes in the frequency of the power grid system, changes in the head of the pump inlet pipeline system, and stalling or overspeeding of the drive system can occur. These conditions can cause pressure fluctuations, which in turn can lead to changes in axial force. Changes in axial force can cause axial movement of the rotor components (pump shaft 2 and impeller 21) of the multistage pump. At this time, the impeller 21 moves towards the guide vane 11, causing the friction ring 4 to squeeze the first spring 3. The elastic force generated by the first spring 3 can buffer the axial force. Alternatively, the axial movement of the pump shaft 2 can cause the bearing 52 to move towards the second spring 53, causing the bearing 52 to squeeze the second spring 53. The elastic force generated by the second spring 53 can buffer the axial force.
[0037] Based on the above structural design, when the axial force changes during the operation of the multistage pump, the first spring 3 and the second spring 53 work together to achieve a buffering effect, which can eliminate the axial movement of the rotor components and ensure the safe operation of the multistage pump.
[0038] like Figure 1 and 2 As shown, in some embodiments, multiple first springs 3 and impellers 21 are provided, and the multiple first mounting grooves 111 of the multiple first springs 3 and the multiple friction surfaces 211 of the impellers 21 are arranged in a one-to-one correspondence. In this way, the multiple first springs 3 can better play a buffering role.
[0039] In some embodiments, both the first spring 3 and the second spring 53 are corrugated springs. The advantages of corrugated springs are: space saving, light weight, good elasticity, strong fatigue resistance, easy installation, high customizability, and good sealing performance.
[0040] In some embodiments, bearing 52 is an angular contact ball bearing. The advantages of angular contact ball bearings include: high load capacity, high-speed performance, high rotational accuracy, good rigidity, and long service life.
[0041] like Figure 1 and 2 As shown, in some embodiments, the sidewall of the guide vane 11 has two first mounting grooves 111, which are located at the upper and lower parts of the friction ring 4, respectively. The two first springs 3 corresponding to the two first mounting grooves 111 can apply elastic force to the friction ring 4 evenly. In other embodiments, the sidewall of the guide vane 11 has four first mounting grooves 111, which are distributed around the four sides of the friction ring 4, thus making the elastic force on the friction ring 4 more even.
[0042] In some embodiments, the axial direction of the friction ring 4 coincides with the axial direction of the impeller 21. This ensures smooth contact between the friction ring 4 and the friction surface 211 of the impeller 21.
[0043] like Figure 2 As shown, in some embodiments, a flow-blocking ring 6 is included, which is mounted on the guide vane 11 and located between the guide vane 11 and the impeller 21. A flow channel is formed between the guide vane 11 and the impeller 21.
[0044] like Figure 2 As shown, in some embodiments, the flow-blocking ring 6 has a first flow channel arc surface 61, and the guide vane 11 has a second flow channel arc surface 112. The first flow channel arc surface 61 and the second flow channel arc surface 112 abut against each other to form a smooth flow channel arc surface. In this way, the pressure medium flowing in the flow channel is prevented from directly contacting the pump shaft 2, eliminating the radial force exerted by the pressure medium on the pump shaft 2, and avoiding multiple bending deformations of the rotor components.
[0045] like Figure 2 As shown, in some embodiments, the depth of the first mounting groove 111 is less than the thickness of the friction ring 4. Thus, even if the friction ring 4 is pressed by the friction surface 211, a portion of the friction ring 4 can still protrude from the first mounting groove 111, preventing the friction surface 211 from directly contacting the sidewall of the guide vane 11 and ensuring operational safety.
[0046] like Figure 2 As shown, in some embodiments, the compression stroke of the first spring 3 is a, and when the first spring 3 is not under force, the thickness of the friction ring 4 extending out of the first mounting groove 111 is b, then a < b. Thus, when the first spring 3 is fully compressed to act as a buffer, a portion of the friction ring 4 can still protrude out of the first mounting groove 111, preventing the friction surface 211 from directly contacting the side wall of the guide vane 11, ensuring safe operation.
[0047] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.
Claims
1. A multi-stage pump axial buffer system, characterized in that, include: The middle section has guide vanes, and the sidewalls of the guide vanes have first mounting grooves; A pump shaft is located in the middle section, and an impeller is provided on the pump shaft. The side wall of the impeller near the guide vane has a friction surface. A first spring is disposed in the first mounting slot; A friction ring, one side of which is disposed in the first mounting groove and connected to the spring, and the other side of the friction ring extending out of the first mounting groove and abutting against the friction surface; and The bearing housing has a second mounting groove on its inner wall, a bearing disposed in the second mounting groove, and a second spring. The bearing is mounted on the outer peripheral wall of the pump shaft, and one end of the second spring abuts against the bearing. The first spring exerts a spring force on the friction ring in the opposite direction to the spring force exerted by the second spring on the bearing.
2. The multi-stage pump axial buffer system according to claim 1, characterized in that, The middle section, the first spring, and the impeller are each provided with multiple, and the friction surfaces of the multiple middle sections, the multiple first springs, and the multiple impellers are arranged in a one-to-one correspondence.
3. The multi-stage pump axial buffer system according to claim 1, characterized in that, Both the first spring and the second spring are corrugated springs.
4. The multi-stage pump axial buffer system according to claim 1, characterized in that, The bearing is an angular contact ball bearing.
5. The multi-stage pump axial buffer system according to claim 1, characterized in that, The sidewall of the guide vane has two first mounting grooves, which are located at the upper and lower parts of the friction ring, respectively.
6. The multi-stage pump axial buffer system according to claim 1, characterized in that, The axial direction of the friction ring coincides with the axial direction of the impeller.
7. The multi-stage pump axial buffer system according to claim 1, characterized in that, It includes a flow-blocking ring, which is installed on the guide vane and located between the guide vane and the impeller.
8. The multi-stage pump axial buffer system according to claim 7, characterized in that, The flow-blocking ring has a first flow channel arc surface, and the guide vane has a second flow channel arc surface. The first flow channel arc surface and the second flow channel arc surface abut each other to form a smooth flow channel arc surface.
9. The multi-stage pump axial buffer system according to claim 1, characterized in that, The depth of the first mounting groove is less than the thickness of the friction ring.
10. The multi-stage pump axial buffer system according to claim 1, characterized in that, The compression stroke of the first spring is a, and when the first spring is not under force, the thickness of the friction ring extending out of the first mounting groove is b, then a < b.