Anti-clogging multistage centrifugal pump middle section structure
By creating grooves and setting gaps on the guide vane inlet ring, the problem of impurity clogging in multi-stage centrifugal pumps is solved, achieving efficient cleaning and stable operation, extending service life and improving performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HONGZE DALIAN PUMPS CO LTD
- Filing Date
- 2025-07-28
- Publication Date
- 2026-07-07
AI Technical Summary
The impeller, guide vanes, and intermediate casing flow channels of multistage centrifugal pumps are easily clogged by impurities such as solid particles, fibers, or crystals, resulting in decreased flow rate, increased mechanical losses, vibration, and shortened service life, as well as time-consuming and labor-intensive maintenance.
Multiple grooves are evenly opened in the circumferential direction of the guide vane inlet ring, and the gap between the guide vane inlet ring and the impeller hub is designed. Impurities are cut and ground by the grooves, and a liquid film is generated to suppress vibration and reduce friction and blockage.
It effectively removes impurities, reduces maintenance frequency, extends service life, improves operational stability and efficiency, reduces noise and mechanical loss, and protects mechanical seals and bearings.
Smart Images
Figure CN224469320U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of multistage centrifugal pump technology, and in particular to a mid-section structure of a multistage centrifugal pump that prevents jamming. Background Technology
[0002] The development of multistage centrifugal pumps has been rapid in recent years. Multistage centrifugal pumps have wide applications in industrial fields, such as water supply, drainage, circulating cooling, and boiler feedwater. Their high head and stable performance make them ideal for long-distance and high-flow-rate applications. Multistage centrifugal pumps also have important applications in agricultural irrigation, such as farmland irrigation, sprinkler irrigation, and drip irrigation, improving water resource utilization efficiency. In addition, multistage centrifugal pumps are also used in mine drainage, industrial circulating water systems, fire protection systems, cleaning systems, and machine tool accessories, meeting the needs of different industrial scenarios. The core advantage of multistage centrifugal pumps is that they achieve high head through series impellers, making them particularly suitable for high-head applications such as mine drainage and water supply in high-altitude areas. The head can be flexibly adjusted by increasing or decreasing the number of impeller stages to meet different operating conditions.
[0003] However, the impeller, guide vanes, and intermediate casing of multistage centrifugal pumps have narrow flow channels. The liquids they pump often contain impurities such as solid particles, fibers, or crystals, which accumulate in the gap between the inlet and outlet rings over time, causing obstruction of the flow channels. If the impeller flow channels become blocked, it will directly lead to a decrease in flow rate. Blockage will increase the resistance of the suction pipe, forcing the pump to operate under high load, increasing mechanical losses, and significantly reducing efficiency. After blockage, the pump body needs to be disassembled to clean the impeller, guide vanes, and intermediate flow channels. Although the segmented structure is easy to disassemble, it is time-consuming and labor-intensive. Furthermore, partial blockage will disrupt the dynamic balance of the impeller, causing pump body vibration, and in severe cases, damaging the bearings or pump shaft. Friction from impurities will aggravate wear on the impeller and inlet ring surfaces, shortening their service life. Increased backflow may cause mechanical seal leakage or shaft sleeve wear.
[0004] Therefore, impurities clogging the pumps greatly hinders their normal operation. Utility Model Content
[0005] This invention primarily addresses the technical problems of frequent clogging of impurities and foreign objects in the guide vane ring and impeller hub of current multistage centrifugal pumps, leading to pump vibration, reduced efficiency, shortened service life of the guide vane ring and impeller due to friction, and time-consuming and labor-intensive repeated maintenance. It proposes an anti-clogging mid-section structure for multistage centrifugal pumps, with multiple grooves evenly spaced along the circumference of the guide vane ring. This design cuts and cleans impurities and foreign objects, reducing the workload for operators, eliminating the need for disassembly every time a blockage occurs, and extending the service life of the multistage centrifugal pump.
[0006] This utility model provides a mid-section structure for a multi-stage centrifugal pump that prevents jamming, comprising multiple mid-section units arranged sequentially.
[0007] Each intermediate unit includes: intermediate shell 1, intermediate inlet ring 3, impeller 7, guide vane 6, and guide vane inlet ring 4;
[0008] The impeller 7 and guide vane 6 are disposed inside the middle section housing 1, and the impeller 7 is fixedly mounted on the pump shaft 9;
[0009] A guide vane inlet ring 4 is fixedly installed on the central hole of the guide vane 6, and the guide vane inlet ring 4 is movably sleeved on the hub of the impeller 7; there is a gap between the guide vane inlet ring 4 and the hub of the impeller 7; the guide vane inlet ring 4 has multiple grooves 401 evenly opened in the circumferential direction.
[0010] The intermediate housing 1 has an intermediate inlet ring 3 fixedly installed near the inlet of the impeller 7, and there is a gap between the intermediate inlet ring 3 and the impeller 7.
[0011] Preferably, the gap between the guide vane ring 4 and the hub of the impeller 7 is 0.3-0.5 mm.
[0012] Preferably, the groove 401 has a size of 2mm*2mm.
[0013] Preferably, the mounting surfaces of the guide vane ring 4 and the guide vane 6 are provided with a first step structure 402.
[0014] Preferably, the middle section housing 1 is fixedly mounted with the middle section mouth ring 3 by bolts 2.
[0015] Preferably, the opposite surfaces of the middle section ring 3 and the impeller 7 are provided with a second step structure.
[0016] Preferably, both the middle section inlet ring 3 and the guide vane inlet ring 4 are made of chromium-nickel alloy.
[0017] Preferably, the pump shaft 9 is provided with a keyway, and the impeller 7 is fixed to the pump shaft 9 by a key 8.
[0018] Preferably, a groove is provided on one side of the middle section housing 1, and an O-ring seal 5 is embedded in the groove.
[0019] Preferably, adjacent middle sections of the housing 1 are connected by an inner and outer stop fitting.
[0020] This invention provides a mid-section structure for a multi-stage centrifugal pump designed to prevent jamming. Multiple grooves are evenly spaced along the circumference of the guide vane ring, enabling the cutting and cleaning of impurities and foreign objects. The gap between the mid-section ring and the impeller grinds ingress impurities and generates a liquid film. The installation process of the multi-stage centrifugal pump remains unchanged, making operation simple and convenient. The guide vane ring cuts and decomposes blockages, reducing the workload of operators and eliminating the need for disassembly every time a blockage occurs, saving time and effort. This also reduces frictional wear between the guide vane ring and the impeller, extending the service life of the multi-stage centrifugal pump. Furthermore, the guide vane ring generates a liquid film at the impeller hub during operation. This liquid film, through the Lomakin effect (hydrodynamic support effect), suppresses rotor vibration, improves operational stability, and reduces pump body vibration and noise. This effect is particularly significant when the gap is uniform, reducing load fluctuations on the bearings and mechanical seals of the multi-stage centrifugal pump, better protecting them, and ensuring the pump's efficiency and performance indicators, thus extending its service life. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the middle section unit of the anti-jamming multi-stage centrifugal pump middle section structure provided by this utility model;
[0022] Figure 2 This is a schematic diagram of the structure of the guide vane nozzle ring provided by this utility model;
[0023] Figure 3 This is a cross-sectional view of the guide vane nozzle ring provided by this utility model;
[0024] Figure 4 This is a partial enlarged view of the guide vane nozzle ring provided by this utility model at the groove.
[0025] Reference numerals: 1. Intermediate housing; 2. Bolt; 3. Intermediate inlet ring; 4. Guide vane inlet ring; 5. O-ring seal; 6. Guide vane; 7. Impeller; 8. Key; 9. Pump shaft; 401. Groove; 402. First step structure. Detailed Implementation
[0026] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.
[0027] like Figure 1 As shown in the figure, the present invention provides a multi-stage centrifugal pump intermediate section structure for preventing jamming, comprising multiple intermediate section units arranged sequentially.
[0028] Each intermediate unit includes: intermediate shell 1, intermediate inlet ring 3, impeller 7, guide vane 6, and guide vane inlet ring 4.
[0029] Adjacent intermediate housing sections 1 are connected by an inner and outer stop fit. A groove is provided on one side of the intermediate housing section 1, and an O-ring seal 5 is embedded in the groove to achieve interstage static sealing through axial compression.
[0030] The impeller 7 and guide vane 6 are disposed inside the intermediate housing 1, and the impeller 7 is fixedly mounted on the pump shaft 9. Specifically, the pump shaft 9 is provided with a keyway, and a key 8 is installed in the keyway. The impeller 7 is fixed to the pump shaft 9 by the key 8. The impeller 7 and the pump shaft 9 together constitute the rotor part, and the pump shaft 9 can drive the impeller 7 to rotate.
[0031] The impeller 7 outlet is equipped with guide vanes 6, forming a continuous flow channel to prevent changes in fluid direction, reduce flow losses, and maintain potential energy. A guide vane inlet ring 4 is fixedly installed on the central hole of the guide vane 6. The mounting surfaces of the guide vane inlet ring 4 and the guide vane 6 are provided with a first step structure 402, and the corresponding mounting surfaces of the guide vane 6 are provided with structures adapted to the first step structure 402. The first step structure 402 on the guide vane inlet ring 4 facilitates installation and prevents it from falling off.
[0032] The guide vane ring 4 is movably fitted onto the hub of the impeller 7; there is a gap between the guide vane ring 4 and the hub of the impeller 7 to prevent backflow in the high-pressure area or friction with the impeller 7; the gap between the guide vane ring 4 and the hub of the impeller 7 is 0.3-0.5 mm, preferably 0.4 mm. Figure 2-4 As shown, the guide vane ring 4 has multiple grooves 401 evenly formed in the circumferential direction. The dimensions of each groove 401 are 2mm*2mm. Three grooves 401 can be provided. The grooves 401 effectively cut and break up impurities to prevent clogging. Sharpening the groove surface and edges of the grooves 401 can enhance the cutting effect.
[0033] The intermediate housing 1 has an intermediate inlet ring 3 fixedly installed near the inlet of the impeller 7. A gap exists between the intermediate inlet ring 3 and the impeller 7 to prevent backflow in the high-pressure zone or friction with the impeller 7. The gap between the intermediate inlet ring 3 and the impeller 7 can grind in impurities and form a liquid film. The gap between the intermediate inlet ring 3 and the impeller 7 is 0.3-0.5 mm, preferably 0.4 mm. Specifically, the intermediate housing 1 is fixedly installed with the intermediate inlet ring 3 by bolts 2. A second step structure is provided on the opposite surface of the intermediate inlet ring 3 and the impeller 7, and a structure adapted to the second step structure is provided on the corresponding opposite surface of the impeller 7.
[0034] In this invention, both the middle section mouth ring 3 and the guide vane mouth ring 4 are made of chromium-nickel alloy, which increases the wear resistance of the mouth ring and extends its service life.
[0035] The working principle of this invention is as follows: When a multistage centrifugal pump is in operation, impurities and foreign objects inevitably enter the pump body, especially at the impeller 7 hub and guide vane ring 4 on the pump shaft 9, where they are prone to blockage. By opening multiple grooves on the inner side of the guide vane ring 4, with sharp groove surfaces, impurities and foreign objects can be effectively cut and broken. The gap between the guide vane ring 4 and the impeller 7 hub is set at 0.4mm to prevent backflow in the high-pressure area or friction with the impeller 7, increasing the service life of the impeller 7. Furthermore, a liquid film is generated between the guide vane ring 4 and the impeller 7 hub during operation. This liquid film, through the Lomakine effect, suppresses rotor vibration, reduces pump body vibration and noise, better protects the mechanical seal and bearings, and ensures the working efficiency and performance indicators of the multistage centrifugal pump.
[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions for some or all of the technical features, do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A mid-section structure for a multi-stage centrifugal pump designed to prevent jamming, comprising multiple mid-section units arranged sequentially; Its features are: Each intermediate unit includes: intermediate shell (1), intermediate inlet ring (3), impeller (7), guide vane (6), and guide vane inlet ring (4); The impeller (7) and guide vane (6) are disposed inside the middle section housing (1), and the impeller (7) is fixedly mounted on the pump shaft (9); A guide vane inlet ring (4) is fixedly installed on the central hole of the guide vane (6), and the guide vane inlet ring (4) is movably sleeved on the hub of the impeller (7); there is a gap between the guide vane inlet ring (4) and the hub of the impeller (7); the guide vane inlet ring (4) has multiple grooves (401) evenly opened in the circumferential direction; The intermediate housing (1) has an intermediate inlet ring (3) fixedly installed near the inlet of the impeller (7), and there is a gap between the intermediate inlet ring (3) and the impeller (7).
2. The anti-jamming multi-stage centrifugal pump intermediate section structure according to claim 1, characterized in that, The gap between the guide vane inlet ring (4) and the hub of the impeller (7) is 0.3-0.5 mm.
3. The anti-jamming multi-stage centrifugal pump intermediate section structure according to claim 1, characterized in that, The dimensions of the groove (401) are 2mm*2mm.
4. The anti-jamming multi-stage centrifugal pump intermediate section structure according to claim 1, characterized in that, The mounting surfaces of the guide vane inlet ring (4) and the guide vane (6) are provided with a first step structure (402).
5. The anti-jamming multi-stage centrifugal pump intermediate section structure according to claim 1, characterized in that, The middle section housing (1) is fixedly installed with the middle section mouth ring (3) by bolts (2).
6. The anti-jamming multi-stage centrifugal pump intermediate section structure according to claim 1, characterized in that, The middle section mouth ring (3) and the impeller (7) are provided with a second step structure on their opposite surfaces.
7. The anti-jamming multi-stage centrifugal pump intermediate section structure according to claim 1, characterized in that, Both the middle section mouth ring (3) and the guide vane mouth ring (4) are made of chromium-nickel alloy.
8. The anti-jamming multi-stage centrifugal pump intermediate section structure according to claim 1, characterized in that, The pump shaft (9) is provided with a keyway, and the impeller (7) is fixed to the pump shaft (9) by a key (8).
9. The anti-jamming multi-stage centrifugal pump intermediate section structure according to claim 1, characterized in that, A groove is provided on one side of the middle section housing (1), and an O-ring seal (5) is embedded in the groove.
10. The anti-jamming multi-stage centrifugal pump intermediate section structure according to claim 9, characterized in that, The adjacent middle shell sections (1) are connected by inner and outer stop joints.