Anti-blocking multi-stage centrifugal pump
By incorporating a lifting sleeve and a cutter structure into the multi-stage centrifugal pump, fibrous debris is cut off, thus solving the problem of blockage caused by debris in the multi-stage centrifugal pump and achieving the effects of anti-clogging and extended service life.
Patent Information
- Application Number
- CN202520042033.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-09
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2035-01-09
AI Technical Summary
Multistage centrifugal pumps are prone to blockage in complex water environments due to fibrous debris entangled in the impeller and guide vane gaps, leading to mechanical seal failure and wear. Existing technologies require disassembly and cleaning, which is difficult.
A lifting sleeve and a cutter are installed at the lower part of the pump shaft. The cutter fits tightly against the annular inlet under the action of the compression spring. When rotating at high speed, it cuts off fibrous debris. Combined with the arc-shaped ribs, it ensures no dead angle cutting and prevents debris from getting tangled.
It effectively prevents multi-stage centrifugal pump clogging, extends service life, reduces maintenance frequency, and improves the wear resistance of mechanical seals.
Smart Images
Figure CN223608805U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to centrifugal pump technical field especially relates to a kind of anti-blocking multistage centrifugal pump. BACKGROUND
[0002] Centrifugal pump is widely used in various industries, and the working environment is also various. For some special environment, the water pump often faces the problem of blockage. The existing part of water pump uses complex water quality environment, such as fibrous impurities, material bag, etc., which is easy to cause impeller winding impurities, blockage, resulting in the deformation of the outer end mechanical seal, the wear of the water pump inside, and the failure of the mechanical seal. Since the two impellers of the multistage centrifugal pump are provided with guide vanes, once the fibrous impurities enter the gap between the impeller and the guide vane, it is particularly troublesome for the multistage centrifugal pump, which must be disassembled to clean it. SUMMARY
[0003] In order to solve the problem of multistage centrifugal pump entering impurities and blocking, the utility model provides a kind of anti-blocking multistage centrifugal pump.
[0004] The technical scheme provided by the utility model is: a kind of anti-blocking multistage centrifugal pump, comprising a pump body, a plurality of impellers are installed in the pump body, each impeller is connected with pump shaft through flat key, the pump body is provided with guide vane between two impellers, the pump shaft is vertically arranged, the upper part of the pump shaft is connected with the pump body through mechanical seal, the upper part of the pump shaft is connected with motor through shaft coupling, the motor is fixedly installed on the pump body, the lower part of the pump shaft is connected with the pump body through bearing bush, the lower part of the lowest impeller of the pump body is provided with liquid inlet pipe, the upper part of the uppermost impeller of the pump body is provided with liquid outlet pipe, and the above structure constitutes a vertical multistage centrifugal pump.
[0005] The lowest impeller is limited by open nut, the open nut is threadedly connected with the pump shaft through stop ring, the pump shaft is connected with lifting sleeve through spline at the lower part of the open nut, compression spring is installed between the lifting sleeve and the open nut, two symmetrical cutters are welded on the lower part of the lifting sleeve, the pump body is provided with annular liquid inlet at the lower part of the cutter, the upper surface of the annular liquid inlet is cold worked into a plane, the cutter is connected with the upper surface of the annular liquid inlet, the pump body is provided with liquid inlet cavity at the lower part of the annular liquid inlet, the liquid inlet cavity is communicated with the liquid inlet pipe, and the inner and outer two ring walls of the annular liquid inlet are connected together through circumferentially distributed rib plates.
[0006] The rib plate is in circular arc structure, and the cutter is in linear structure. The connecting line from the outside to the center of the pump shaft of each rib plate passes through another rib plate.
[0007] The pump body is made of nodular cast iron, and the pump shaft, the lifting sleeve and the cutter are made of stainless steel material.
[0008] The cutter is provided with an inclined surface in the rotating direction, and the inclined surface and the bottom plane form a cutting edge.
[0009] The beneficial effects of this utility model are as follows: A lifting sleeve and a cutter are provided at the lower part of the pump shaft. Under the action of the compression spring, the cutter is tightly attached to the annular inlet. When the pump is working, the pump shaft rotates at high speed, and the cutter and the rib plate combine to cut the incoming fibrous debris, preventing it from getting tangled in the impeller or stuck between the impeller and the guide vane. This can prevent the problem of blockage in multi-stage centrifugal pumps. The cutter and the rib plate have contact opportunities on the entire circumference of the annular inlet, that is, the cutter cuts the fibrous debris without dead angles. There is always an angle between the arc-shaped rib plate and the cutter. This angle can cut the fibrous debris and prevent the debris from getting tangled on the rib plate. Attached Figure Description
[0010] Appendix Figure 1 This is a schematic diagram of the structure of this utility model;
[0011] Appendix Figure 2 Appendix Figure 1 AA cross-section view;
[0012] Appendix Figure 3 This is a cross-sectional view of the cutting blade in this utility model.
[0013] In the diagram, 1-pump body, 2-impeller, 3-guide vane, 4-pump shaft, 5-mechanical seal, 6-coupling, 7-motor, 8-open nut, 9-lifting sleeve, 10-cutter, 11-annular inlet, 12-bearing bush, 13-inlet pipe, 14-inlet chamber, 15-outlet pipe, 16-rib plate, 17-sloping surface. Detailed Implementation
[0014] The following explanation uses a vertical multistage centrifugal pump as an example:
[0015] like Figures 1 to 3 As shown, an anti-clogging multistage centrifugal pump includes a pump body 1, with multiple impellers 2 installed inside the pump body 1. Each impeller 2 is connected to a pump shaft 4 via a key. The pump body 1 has guide vanes 3 between two impellers 2. The pump shaft 4 is vertically arranged. The upper part of the pump shaft 4 is connected to the pump body 1 via a mechanical seal 5. The upper part of the pump shaft 4 is connected to a motor 7 via a coupling 6. The motor 7 is fixedly installed on the pump body 1. The lower part of the pump shaft 4 is connected to the pump body 1 via a bearing 12. The pump body 1 has an inlet pipe 13 at the bottom of the lowest impeller 2 and an outlet pipe 15 at the top of the highest impeller 2. The above structure constitutes a vertical multistage centrifugal pump.
[0016] The lowermost impeller 2 is limited by the open nut 8, the open nut 8 is threadedly connected with the pump shaft 4, the pump shaft 4 is connected with the lifting sleeve 9 through the spline at the lower part of the open nut 8, the compression spring is installed between the lifting sleeve 9 and the open nut 8, the two symmetrical cutter 10 are welded at the lower part of the lifting sleeve 9, the annular inlet 11 is arranged at the lower part of the cutter 10, the upper surface of the annular inlet 11 is cold processed into a plane, the cutter 10 is connected with the upper surface of the annular inlet 11, the inlet cavity 14 is arranged at the lower part of the annular inlet 11, the inlet cavity 14 is communicated with the inlet pipe 13, the inner and outer two ring walls of the annular inlet 11 are connected together through the circumferentially distributed rib plate 16.
[0017] The lifting sleeve 9 and the cutter 10 are arranged at the lower part of the pump shaft 4, the cutter 10 is closely connected with the upper surface of the annular inlet 11 under the action of the compression spring, when the pump works, the pump shaft 4 rotates at high speed, the cutter 10 and the rib plate 16 cut the entering fiber-like impurities, avoid winding in the impeller 2 or blocking between the impeller 2 and the guide vane 3, and the problem of blocking of the multi-stage centrifugal pump can be prevented.
[0018] The rib plate 16 is in arc structure, the cutter 10 is in linear structure, the connecting line of each rib plate 16 from the outside to the center of the pump shaft 4 passes through another rib plate 16, the cutter 10 and the rib plate 16 have contact opportunities on the whole circumference of the annular inlet 11, that is, the cutter 10 has no dead angle to cut the fiber-like impurities, there is always an angle between the arc-shaped rib plate 16 and the cutter 10, the angle can cut the fiber-like impurities, and avoid winding the impurities on the rib plate 16.
[0019] The pump body 1 is made of nodular cast iron, the nodular cast iron has good wear resistance, and the service life of the rib plate 16 can be improved, the pump shaft 4, the lifting sleeve 9 and the cutter 10 are made of stainless steel material, and the cutting effect is avoided from being affected by rust.
[0020] The cutter 10 is in flat structure, the cutter 10 is processed with the inclined surface 17 in the rotating direction, and the inclined surface 17 and the bottom plane form the cutting edge.
Claims
1. A clog-proof multi-stage centrifugal pump comprising a pump body (1), characterized in that: The pump body (1) is provided with a plurality of impellers (2), each of which is connected with the pump shaft (4) through a flat key, the pump body (1) is provided with guide vanes (3) between the two impellers (2), the pump shaft (4) is vertically arranged, the upper portion of the pump shaft (4) is connected with the pump body (1) through a mechanical seal (5), the upper portion of the pump shaft (4) is connected with a motor (7) through a shaft coupling (6), the motor (7) is fixedly installed on the pump body (1), the lower portion of the pump shaft (4) is connected with the pump body (1) through a bearing bush (12), the pump body (1) is provided with a liquid inlet pipe (13) below the lowermost impeller (2), and the pump body (1) is provided with a liquid outlet pipe (15) above the uppermost impeller (2), and the above structure constitutes a vertical multi-stage centrifugal pump; The lowermost impeller (2) is limited by an open nut (8), the open nut (8) is threadedly connected with the pump shaft (4) through a stop ring, the pump shaft (4) is connected with a lifting sleeve (9) through a spline below the open nut (8), a compression spring is installed between the lifting sleeve (9) and the open nut (8), two symmetrical cutters (10) are welded to the lower portion of the lifting sleeve (9), the pump body (1) is provided with an annular liquid inlet (11) below the cutters (10), the upper surface of the annular liquid inlet (11) is cold processed into a plane, the cutters (10) are connected to the upper surface of the annular liquid inlet (11), the pump body (1) is provided with a liquid inlet cavity (14) below the annular liquid inlet (11), the liquid inlet cavity (14) is communicated with the liquid inlet pipe (13), and the inner and outer two annular walls of the annular liquid inlet (11) are connected together through circumferentially distributed rib plates (16).
2. A pump according to claim 1, wherein: The rib plates (16) are in circular arc structure, the cutters (10) are in linear structure, and the connecting line from the outside to the center of the pump shaft (4) of each rib plate (16) passes through another rib plate (16).
3. A pump according to claim 1, wherein: The pump body (1) is made of nodular cast iron, and the pump shaft (4), the lifting sleeve (9) and the cutters (10) are made of stainless steel.
4. A pump according to claim 1, wherein: The lower portion of the cutter (10) is flat, the cutter (10) is provided with an inclined surface (17) in the rotating direction, and the inclined surface (17) and the bottom plane form a cutting edge.