Pump body and multi-stage centrifugal pump
By employing a locking structure with a concave-convex fit between the final stage guide vane and the pump cover, the problem of insufficient friction is solved, enabling a static connection under high flow conditions and extending the service life of the multistage centrifugal pump.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ANHUI SHINHOO CANNED MOTOR PUMP CO LTD
- Filing Date
- 2025-05-15
- Publication Date
- 2026-04-24
AI Technical Summary
Insufficient friction between the final stage guide vane and the pump cover prevents rotation, leading to increased wear and noise, especially under high flow conditions.
By employing a concave-convex fit, a circumferential locking mechanism is achieved by setting protrusions and grooves between the final stage guide vane and the pump cover, thereby enhancing the anti-rotation capability.
It effectively prevents relative rotation between the final stage guide vane and the pump cover, avoiding wear and increased noise, and extending service life.
Smart Images
Figure CN224161838U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of centrifugal pump technology, and more particularly to pump bodies and multistage centrifugal pumps. Background Technology
[0002] Unlike single-stage centrifugal pumps, which have only one impeller, multistage centrifugal pumps consist of multiple impellers arranged sequentially along the axial direction. By using multiple impellers, the pump's head can be increased. Specifically, multistage centrifugal pumps also include multiple guide vanes, which are stationary components positioned one-to-one around the outer circumference of each impeller, guiding the fluid from the impeller outlet to the inlet of the next stage impeller.
[0003] CN220081781U relates to a multistage centrifugal pump, wherein the front end of the first-stage guide vane abuts against the inner wall of the pump casing along the axial direction, and the rear end of the last-stage guide vane abuts against the pump cover, thereby fixing multiple guide vanes axially to the pump casing and the pump cover. Furthermore, the friction between the first-stage guide vane and the pump casing, and the friction between the last-stage guide vane and the pump cover, prevent the guide vanes from rotating.
[0004] However, the last stage guide vane is usually made of plastic or metal, while the pump cover is usually made of metal. The friction between the last stage guide vane and the pump cover is relatively small. When the multistage centrifugal pump is at a high flow rate, the friction between the last stage guide vane and the pump cover may be insufficient to prevent rotation between the last stage guide vane and the pump cover. Utility Model Content
[0005] The purpose of this application is to provide a pump body and a multistage centrifugal pump to avoid relative rotation between the final stage guide vane and the pump cover.
[0006] In a first aspect, this application provides a pump body, comprising: a final stage guide vane and a pump cover, wherein the rear surface of the final stage guide vane abuts against the front surface of the pump cover.
[0007] The rear surface of the final stage guide vane and the front surface of the pump cover are locked in the circumferential direction through a concave-convex fit.
[0008] Secondly, this application provides a multi-stage centrifugal pump, including the pump body described above.
[0009] Compared with the prior art, this application includes at least the following beneficial effects:
[0010] The rear surface of the final stage guide vane and the front surface of the pump cover are locked in the circumferential direction through a concave-convex fit. Therefore, the final stage guide vane and the pump cover prevent relative rotation not only through friction but also through the blocking force generated by the concave-convex fit, thereby further enhancing the anti-rotation capability between the final stage guide vane and the pump cover. According to the pump body of this application, even when the multi-stage centrifugal pump is at high flow rates, the final stage guide vane and the pump cover can remain relatively stationary, avoiding wear and increased noise caused by rotation of the final stage guide vane, effectively extending its service life. Attached Figure Description
[0011] Figure 1 A schematic diagram of the pump body of a multistage centrifugal pump according to an embodiment of this application is shown.
[0012] Figure 2 A cross-sectional view of the pump body according to an embodiment of this application is shown.
[0013] Figure 3 A schematic diagram of the final stage guide vane and pump cover according to an embodiment of this application is shown.
[0014] Figure 4 An exploded view of the final stage guide vane and pump cover according to an embodiment of this application is shown.
[0015] Figure 5 An exploded view of the final stage guide vane and pump cover according to an embodiment of this application is shown.
[0016] Figure label:
[0017] 10. Pump body; 11. Pump casing; 111. Inlet; 112. Outlet; 12. Impeller; 121. First stage impeller; 122. Second stage impeller; 123. Third stage impeller; 124. Last stage impeller; 13. Guide vane; 131. First stage guide vane; 132. Second stage guide vane; 133. Third stage guide vane; 134. Last stage guide vane; 14. Pump cover; 15. Protrusion; 16. Groove; 17. Side opening; 18. First positioning part; 181. First ring body; 19. Second positioning part; 191. Second ring body. Detailed Implementation
[0018] The technical solution of this application will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this application and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not all of them.
[0019] This application defines certain directional terms. Unless otherwise stated, the directional terms used, such as "up," "down," "left," "right," "inner," and "outer," are used for ease of understanding and therefore do not constitute a limitation on the scope of protection of this application.
[0020] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0021] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0022] This application relates to centrifugal pumps, and more particularly to multistage centrifugal pumps.
[0023] like Figure 1 and Figure 2 As shown, the multistage centrifugal pump includes a pump body 10 and a motor (not shown) connected to the pump body 10. The pump body 10 is used to pump fluids, such as water. Specifically, the pump body 10 includes a pump casing 11 and an impeller 12 disposed in the inner cavity of the pump casing 11. The pump casing 11 has an inlet 111 and an outlet 112 communicating with the inner cavity. The motor is used to drive the impeller 12 to rotate, so that fluid enters the inner cavity from the inlet 111 and is thrown towards the outlet 112 by the impeller 12.
[0024] like Figure 2 As shown, there are multiple impellers 12, for example... Figure 2 The four shown in the image can also be two, three, or more than five. Multiple impellers 12 are arranged sequentially along the axial direction, and each impeller 12 is mounted to the motor shaft (not shown) of the motor and rotates synchronously with the motor shaft.
[0025] Along the flow direction of the fluid, the impeller 12 located at the upstream end of the flow direction can be called the first-stage impeller 121, the impeller 12 located at the downstream end of the flow direction can be called the last-stage impeller 124, and the impeller 12 located between the first-stage impeller 121 and the last-stage impeller 124 can be called the intermediate impeller. For example, in... Figure 2 In the middle, the four impellers 12 are, from left to right, the first-stage impeller 121, the second-stage impeller 122 (intermediate impeller), the third-stage impeller 123 (intermediate impeller), and the final-stage impeller 124.
[0026] like Figure 2 As shown, the pump body 10 also includes a plurality of guide vanes 13 disposed in the inner cavity. The number of guide vanes 13 matches the number of impellers 12, and the plurality of guide vanes 13 are disposed one-to-one on the outer periphery of the plurality of impellers 12. The plurality of guide vanes 13 are arranged sequentially along the axial direction. Unlike the rotatable impellers 12, the guide vanes 13 are stationary components and cannot rotate; they are fixed relative to the pump casing 11.
[0027] Along the flow direction of the fluid, the guide vane 13 located at the upstream end of the flow direction can be called the first-stage guide vane 131, the guide vane 13 located at the downstream end of the flow direction can be called the last-stage guide vane 134, and the guide vane 13 located between the first-stage guide vane 131 and the last-stage guide vane 134 can be called the intermediate guide vane. For example, in... Figure 2 In the middle, the four guide vanes 13 are, from left to right, the first-stage guide vane 131, the second-stage guide vane 132 (intermediate guide vane), the third-stage guide vane 133 (intermediate guide vane), and the last-stage guide vane 134.
[0028] In this embodiment, the first-stage guide vane 131 guides the fluid discharged from the first-stage impeller 121 to the second-stage impeller 122, the second-stage guide vane 132 guides the fluid discharged from the second-stage impeller 122 to the third-stage impeller 123, the third-stage guide vane 133 guides the fluid discharged from the third-stage impeller 123 to the last-stage guide vane 134, and the last-stage guide vane 134 guides the fluid discharged from the last-stage impeller 124 to the outlet 112.
[0029] like Figure 2 As shown, the pump body 10 also includes a pump cover 14, which is located on the side of the pump body 10 facing the motor. Figure 2 The right side of the pump body 10. The pump cover 14 will... Figure 2 The right end of the inner cavity is closed to prevent fluid from entering the motor.
[0030] like Figure 2 As shown, the left end of the first-stage guide vane 131 abuts against the pump casing 11, and the right end of the last-stage guide vane 134 abuts against the pump cover 14, thereby fixing multiple guide vanes 13 axially inside the pump casing 11.
[0031] To prevent relative rotation between the final stage guide vane 134 and the pump cover 14, this application embodiment provides a pump body 10.
[0032] like Figure 3 As shown, the pump body 10 includes a final stage guide vane 134 and a pump cover 14. The rear surface of the final stage guide vane 134 (i.e. the surface facing the pump cover 14) abuts against the front surface of the pump cover 14 (the surface facing the final stage guide vane 134).
[0033] In addition, such as Figure 3 As shown, the rear surface of the final stage guide vane 134 and the front surface of the pump cover 14 are locked in the circumferential direction through a concave-convex fit. The concave-convex fit is achieved by the insertion between the groove 16 and the protrusion 15.
[0034] Therefore, the final stage guide vane 134 and the pump cover 14 not only prevent relative rotation between them through friction, but also prevent relative rotation between them through the blocking force generated by the convex-concave fit, thereby further enhancing the anti-rotation capability between the final stage guide vane 134 and the pump cover 14.
[0035] According to the pump body 10 of the present application embodiment, even when the multi-stage centrifugal pump is at a high flow rate, the final stage guide vane 134 and the pump cover 14 can remain relatively stationary, avoiding wear and noise increase of the final stage guide vane 134 due to rotation, and effectively extending the service life.
[0036] like Figure 4 and Figure 5 As shown, as an example, the rear surface of the final stage guide vane 134 is provided with a groove 16, and the front surface of the pump cover 14 is provided with a protrusion 15, which is inserted into the groove 16. Thus, the anti-rotation between the final stage guide vane 134 and the pump cover 14 is achieved through the interlocking fit between the protrusion 15 and the groove 16.
[0037] However, in an example not shown, the rear surface of the final stage guide vane 134 may have a protrusion 15, and the front surface of the pump cover 14 may have a groove 16, with the protrusion 15 inserted into the groove 16. Alternatively, the rear surface of the final stage guide vane 134 may have both a protrusion 15 and a groove 16, and the front surface of the pump cover 14 may also have both a protrusion 15 and a groove 16, with the protrusion 15 on the pump cover 14 inserted into the groove 16 on the final stage guide vane 134.
[0038] There is no limit to the number of protrusions 15 and grooves 16. For example, there may be one, two, three, four, or five protrusions 15 and grooves 16.
[0039] It should be noted that the positions of the protrusion 15 and the groove 16 are related to the materials of the final stage guide vane 134 and the pump cover 14. For example, when the final stage guide vane 134 is made of plastic and the pump cover 14 is made of metal, the protrusion 15 is generally located on the pump cover 14, and the groove 16 is generally located on the final stage guide vane 134. This ensures that the protrusion 15 has sufficient strength and will not break when the multistage centrifugal pump is operating at high flow rates. However, when both the final stage guide vane 134 and the pump cover 14 are made of metal, the protrusion 15 and the groove 16 can be located on the final stage guide vane 134 and / or the pump cover 14.
[0040] As an example, the pump cover 14 can be made of stainless steel, and the protrusions 15 and / or grooves 16 can be integrally formed on the pump cover 14 by stamping.
[0041] In some embodiments, the protrusion 15 and the groove 16 may be clearance fit. When the multistage centrifugal pump is at a high flow rate, there is significant stress between the final stage guide vane 134 and the pump cover 14. With the influence of fluid temperature and pressure, the interference fit between the protrusion 15 and the groove 16 may be at risk of breakage.
[0042] In some embodiments, such as Figure 3 and Figure 4 As shown, a side opening 17 can be formed on the side of the groove 16 facing the radially outer side of the final stage guide vane 134. Thus, when assembling the final stage guide vane 134 and the pump cover 14, the assembler can clearly observe from the outside whether the protrusion 15 is inserted into the groove 16.
[0043] In some embodiments, such as Figure 5 As shown, the rear surface of the final stage guide vane 134 is provided with a first positioning part 18, and the front surface of the pump cover 14 is provided with a second positioning part 19. The first positioning part 18 and the second positioning part 19 are engaged with each other.
[0044] For example, the first positioning part 18 can be a first ring body 181, and the second positioning part 19 can be a second ring body 191. The inner diameter of the first ring body 181 is equal to the outer diameter of the second ring body 191, so that the inner circumferential surface of the first ring body 181 can engage with the outer circumferential surface of the second ring body 191.
[0045] Although this application has been described in detail above with general descriptions, specific embodiments, and experiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of this application fall within the scope of protection claimed in this application.
Claims
1. A pump body, characterized in that, include: The final stage guide vane (134) and the pump cover (14) are provided, with the rear surface of the final stage guide vane (134) abutting the front surface of the pump cover (14). The rear surface of the final stage guide vane (134) and the front surface of the pump cover (14) are locked in the circumferential direction through a concave-convex fit.
2. The pump body according to claim 1, characterized in that, The rear surface of the final stage guide vane (134) is provided with a groove (16), and the front surface of the pump cover (14) is provided with a protrusion (15), which is inserted into the groove (16).
3. The pump body according to claim 1, characterized in that, The rear surface of the final stage guide vane (134) is provided with a protrusion (15), and the front surface of the pump cover (14) is provided with a groove (16), and the protrusion (15) is inserted into the groove (16).
4. The pump body according to claim 1, characterized in that, The rear surface of the final stage guide vane (134) is provided with a protrusion (15) and a groove (16), and the front surface of the pump cover (14) is provided with a protrusion (15) and a groove (16). The protrusion (15) on the pump cover (14) is inserted into the groove (16) on the final stage guide vane (134).
5. The pump body according to any one of claims 2 to 4, characterized in that, The protrusion (15) and the groove (16) are in a clearance fit.
6. The pump body according to any one of claims 2 to 4, characterized in that, The groove (16) has a side opening (17) on the side facing the radially outer side of the final stage guide vane (134).
7. The pump body according to claim 2 or 4, characterized in that, The pump cover (14) is made of stainless steel, and the protrusion (15) on the pump cover (14) is integrally formed by stamping.
8. The pump body according to claim 2, characterized in that, The final stage guide vane (134) is made of plastic, and the pump cover (14) is made of metal.
9. The pump body according to any one of claims 1 to 4, characterized in that, The rear surface of the final stage guide vane (134) is provided with a first positioning part (18), and the front surface of the pump cover (14) is provided with a second positioning part (19). The first positioning part (18) and the second positioning part (19) engage with each other.
10. A multistage centrifugal pump, characterized in that, The pump body includes any one of claims 1 to 9.