Multi-stage centrifugal pump

Abstract

The utility model discloses a multistage centrifugal pump, which belongs to the technical field of centrifugal pumps and comprises a driving motor, a centrifugal pump body and a filter component, the driving motor is arranged on one side of the centrifugal pump body, an output shaft of the driving motor is fixedly connected with an input shaft of the centrifugal pump body, a water inlet and a water outlet are arranged on the centrifugal pump body, and the filter component is arranged on the centrifugal pump body. The centrifugal pump body is provided with a water inlet pipe, the water inlet pipe is communicated with the centrifugal pump body through a water inlet, the filtering assembly comprises a filtering cylinder and a filtering pipe, the filtering pipe is arranged on the water inlet pipe, and the filtering cylinder is arranged in the filtering pipe to filter impurities in water flow; impurities in the centrifugal pump are prevented from damaging or blocking blades in the centrifugal pump, the working efficiency of the centrifugal pump is prevented from being affected, and the service life of the centrifugal pump is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal pumps, and more specifically, to a multistage centrifugal pump. Background Art

[0002] A multistage centrifugal pump is a combination of two or more centrifugal pumps with the same function. In terms of the fluid passage structure, it is manifested that the medium pressure relief port of the first stage communicates with the inlet of the second stage, and the medium pressure relief port of the second stage communicates with the inlet of the third stage. Such a series structure forms a multistage centrifugal pump. The characteristics of a multistage centrifugal pump include: high head: it can achieve a high head through the series operation of multiple impellers, and is suitable for occasions where liquids need to be transported to a high position or overcome large resistance; relatively stable flow rate: within a certain range of rotational speed and head, the flow rate is relatively stable; compact structure: compared with a single-stage centrifugal pump, the volume of a multistage centrifugal pump is relatively small under the same head. Multistage centrifugal pumps are widely used in industrial water supply and drainage, high-rise building water supply, fire water supply, mine drainage, agricultural irrigation and other fields.

[0003] The patent with the Chinese patent publication number CN220059913U discloses a multistage centrifugal pump, including a pump

[0004] body. A bearing is installed inside the pump body, an impeller is installed in the middle of the bearing. The impeller is of a disc-shaped structure. A strengthening component for increasing the internal water flow is installed in the middle of the impeller, and fixing components for stable rotation are installed on both planar sides of the impeller. A bracket is installed outside the pump body. The strengthening component includes: an impeller, a clamping groove, blades, and a sleeve. The impeller is of a disc-shaped structure, and a clamping groove is formed in the middle of the arc surface of the impeller. The clamping groove is an annular groove, and blades are installed inside the clamping groove. Multiple groups of the blades are of an arc structure, and the blades are evenly installed on the sleeve. The sleeve is placed in the clamping groove, and the sleeve is sleeved outside the bearing. In this utility model, the pump body is protected by the bracket, and the blades in the middle of the impeller are used to increase the acting force on the water inside the pump body when the impeller rotates, thereby increasing the working efficiency of the pump body.

[0005] However, the above-mentioned existing technical solutions have the following defects: when a multistage centrifugal pump is in use, there may be some impurities in the water entering from the water inlet. The impurities may cause blockage or damage to the impeller inside the centrifugal pump, resulting in abnormal operation.

[0006] Therefore, it is necessary to provide a multistage centrifugal pump to solve the above problems. Summary of the Utility Model

[0007] The utility model provides a multistage centrifugal pump, which can improve the problem that impurities in the water flow cause blockage to the centrifugal pump in the related art.

[0008] An embodiment of the present application provides a multistage centrifugal pump, including a driving motor, a centrifugal pump body, and a filtering assembly. The driving motor is disposed on one side of the centrifugal pump body. The output shaft of the driving motor is fixedly connected to the input shaft of the centrifugal pump body. The centrifugal pump body is provided with a water inlet and a water outlet. A water inlet pipe is disposed on the centrifugal pump body, and the water inlet pipe is communicated with the centrifugal pump body through the water inlet. The filtering assembly includes a filter cartridge and a filter pipe. The filter pipe is disposed on the water inlet pipe, and the filter cartridge is disposed in the filter pipe.

[0009] In the above technical solution of the embodiment of the present application, at least the following technical effects are achieved: When using the multistage centrifugal pump, when water flows from the water inlet pipe through the water inlet into the centrifugal pump, the water will pass through the filter cartridge. The filter cartridge filters the impurities in the water, and then flows into the centrifugal pump, which can prevent impurities from entering the pump. When used for a long time, the filter screen needs to be cleaned.

[0010] The multistage centrifugal pump provided by the embodiment of the present application can filter the impurities in the water through the settings of the water inlet pipe, the filter cartridge, and the filter pipe, avoiding the impurities therein from damaging or blocking the blades inside the centrifugal pump and affecting the working efficiency of the centrifugal pump.

[0011] In some embodiments, the filtering assembly further includes a fixing cover, a first bolt, and a limiting block. The fixing cover is disposed at one end of the filter pipe away from the water inlet pipe. A plurality of first through holes are provided on the fixing cover. The first bolt is threadedly connected to the fixing cover through the first through hole. The limiting block is disposed on the water inlet pipe. One end of the filter cartridge abuts against the limiting block, and the other end of the filter cartridge abuts against the fixing cover.

[0012] In some embodiments, the distance between one end of the filter pipe close to the water inlet pipe and the centrifugal pump body is greater than the distance between one end of the filter pipe away from the water inlet pipe and the centrifugal pump body.

[0013] In some embodiments, an impeller is disposed in the centrifugal pump body. The impeller is sleeved on the input shaft of the centrifugal pump body, and a plurality of impellers are provided.

[0014] In some embodiments, mounting seats are provided at the bottoms of both the centrifugal pump body and the driving motor. Second through holes are provided on the mounting seats.

[0015] In some embodiments, a sealing gasket is further disposed on the fixing cover. The surface of the sealing gasket away from the fixing cover abuts against the filter pipe. Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of a multi-stage centrifugal pump of the present utility model;

[0018] Figure 2 It is a cross-sectional view of the centrifugal pump body of a multi-stage centrifugal pump of the present utility model;

[0019] Figure 3 It is a cross-sectional view of the filter assembly of a multi-stage centrifugal pump of the present utility model;

[0020] Figure 4 It is Figure 3 The enlarged view at position A in

[0021] Explanation of the reference numerals in the figure:

[0022] 1. Centrifugal pump body; 2. Filter assembly; 21. Filter cylinder; 22. Filter pipe; 23. Fixed cover; 24. First bolt; 25. Limiting block; 3. Mounting seat; 4. Water inlet; 5. Water outlet; 6. Driving motor; 7. Sealing gasket; 8. Water inlet pipe; 9. First through hole; 10. Second through hole; 11. Impeller. Specific embodiments

[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the following further details the present application in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above accompanying drawing descriptions are intended to cover non-exclusive inclusion.

[0025] A multistage centrifugal pump combines two or more centrifugal pumps with the same function. In terms of the fluid passage structure, it is manifested that the medium pressure relief port of the first stage is connected to the inlet of the second stage, and the medium pressure relief port of the second stage is connected to the inlet of the third stage. Such a series connection mechanism forms a multistage centrifugal pump. The characteristics of a multistage centrifugal pump include: high head: it can achieve a high head through the series operation of multiple impellers, and is suitable for occasions where liquids need to be transported to a higher position or overcome greater resistance; relatively stable flow rate: within a certain range of rotational speed and head, the flow rate is relatively stable; compact structure: compared with a single-stage centrifugal pump, at the same head, the volume of a multistage centrifugal pump is relatively small. Multistage centrifugal pumps are widely used in industrial water supply and drainage, high-rise building water supply, fire water supply, mine drainage, agricultural irrigation and other fields.

[0026] Patent No. CN220059913U of the Chinese Patent Publication discloses a multistage centrifugal pump, including a pump

[0027] body. A bearing is installed inside the pump body. An impeller is installed in the middle position of the bearing. The impeller is of a disc-shaped structure. A strengthening component for increasing the internal water flow is installed in the middle position of the impeller. And fixing components for stable rotation are installed on both plane sides of the impeller. A bracket is installed outside the pump body. The strengthening component includes: an impeller, a clamping groove, blades, and a sleeve. The impeller is of a disc-shaped structure. And an annular groove, i.e., a clamping groove, is opened in the middle position of the arc surface of the impeller. Blades are installed inside the clamping groove. Multiple groups of the blades are of an arc-shaped structure. The blades are evenly installed on the sleeve. The sleeve is placed in the clamping groove. The sleeve is sleeved outside the bearing. In this utility model, the pump body is protected by the bracket, and the blades in the middle of the impeller are used to increase the acting force on the water inside the pump body when the blades rotate, thereby increasing the working efficiency of the pump body.

[0028] However, the above prior art solutions have the following defects: when a multistage centrifugal pump is in use, there may be some impurities in the water entering from the water inlet. The impurities may cause blockage or damage to the impeller inside the centrifugal pump, resulting in abnormal operation.

[0029] Therefore, it is necessary to provide a multistage centrifugal pump to solve the above problems.

[0030] Based on this, in order to improve the problem in the related technology that impurities in the water flow cause blockage to the centrifugal pump.

[0031] Please refer to Figure 1 and Figure 4, A multistage centrifugal pump, comprising a driving motor 6, a centrifugal pump body 1 and a filtering component 2. The driving motor 6 is arranged on one side of the centrifugal pump body 1. The output shaft of the driving motor (6) is fixedly connected to the input shaft of the centrifugal pump body (1). The centrifugal pump body 1 is provided with a water inlet 4 and a water outlet 5. The centrifugal pump body 1 is provided with a water inlet pipe 8, and the water inlet pipe 8 communicates with the centrifugal pump body 1 through the water inlet 4. The filtering component 2 is used for filtering water flow.

[0032] With such a setting, the water flow flows in from the water inlet pipe 8, passes through the filtering component 2 to filter the impurities therein, and then flows into the interior of the centrifugal pump through the water inlet 4.

[0033] Optionally, in some embodiments, please refer to Figure 2 and Figure 4 , The filtering component 2 includes a filter cartridge 21 and a filter pipe 22. The filter pipe 22 is arranged on the water inlet pipe 8. The filter cartridge 21 is arranged in the filter pipe 22. The filtering component 2 further includes a fixing cover 23, a first bolt 24 and a limiting block 25. The fixing cover 23 is arranged at one end of the filter pipe 22 away from the water inlet pipe 8. The fixing cover 23 is provided with a plurality of first through holes 9. The first bolt 24 is threadedly connected to the fixing cover 23 through the first through holes 9. The limiting block 25 is arranged on the water inlet pipe 8. One end of the filter cartridge 21 abuts against the limiting block 25, and the other end of the filter cartridge 21 abuts against the fixing cover 23. The distance between one end of the filter pipe 22 close to the water inlet pipe 8 and the centrifugal pump body 1 is greater than the distance between the other end of the filter pipe 22 away from the water inlet pipe 8 and the centrifugal pump body 1. An impeller 11 is arranged in the centrifugal pump body 1. The impeller 11 is sleeved on the input shaft of the centrifugal pump body 1. A plurality of impellers 11 are provided. Mounting seats 3 are arranged at the bottoms of both the centrifugal pump body 1 and the driving motor 6. The mounting seats 3 are provided with second through holes 10. A sealing gasket 7 is further arranged on the fixing cover 23. One side of the sealing gasket 7 away from the fixing cover 23 abuts against the filter pipe 22.

[0034] With such a setting, when using a multistage centrifugal pump, water flows in from one end of the water inlet pipe 8, and then passes through the filter pipe 22. The filter pipe 22 is connected to the water inlet pipe 8, and a filter cartridge 21 is arranged inside the filter pipe 22. The water flow is filtered through the filter cartridge 21, and the impurities in the water flow will be filtered out by the filter cartridge 21. Then the water flow continues to flow downward and enters the centrifugal pump through the water inlet 4. Also, because the distance between the end of the filter pipe 22 close to the water inlet pipe 8 and the centrifugal pump body 1 is greater than the distance between the end of the filter pipe 22 far from the water inlet pipe 8 and the centrifugal pump body 1, the impurities will move towards the end of the filter net far from the water pipe under the action of gravity and will not block the water inlet pipe 8, thus not affecting the normal flow of the water. When it needs to be used for a long time and the filter screen needs to be cleaned and the impurities in the filter cartridge 21 are removed, the connection between the first bolt 24 and the fixed cover 23 can be opened, the fixed cover 23 can be opened, the filter cartridge 21 inside can be taken out, the filter cartridge 21 can be cleaned, and then it can be put back into the filter pipe 22 and then continue to be used. Such a setting filters the impurities in the water flow, avoids the impurities from damaging or blocking the blades inside the centrifugal pump, affects the working efficiency of the centrifugal pump, and also increases the service life of the centrifugal pump. The setting of the sealing gasket 7 on the fixed cover 23 increases the sealing performance between the fixed cover 23 and the filter pipe 22 and prevents the water flow from flowing out of the filter pipe 22. The mounting seat 3 facilitates the installation of the multistage centrifugal pump.

[0035] The above is only the preferred specific embodiment of the present invention; however, the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its improved concept, makes equivalent substitution or change, and should be covered by the protection scope of the present invention.

Claims

1. A multistage centrifugal pump, characterized in that: The invention comprises a driving motor (6), a centrifugal pump body (1) and a filter assembly (2); the driving motor (6) is arranged on one side of the centrifugal pump body (1); the output shaft of the driving motor (6) is fixedly connected to the input shaft of the centrifugal pump body (1); the centrifugal pump body (1) is provided with a water inlet (4) and a water outlet (5); the centrifugal pump body (1) is provided with a water inlet pipe (8), and the water inlet pipe (8) is connected to the centrifugal pump body (1) through the water inlet (4); the filter assembly (2) comprises a filter cartridge (21) and a filter tube (22); the filter tube (22) is arranged on the water inlet pipe (8), and the filter cartridge (21) is arranged in the filter tube (22).

2. A multistage centrifugal pump according to claim 1, characterized in that: The filter assembly (2) further comprises a fixing cover (23), a first bolt (24) and a stop block (25); the fixing cover (23) is arranged on one end of the filter tube (22) away from the water inlet pipe (8); a plurality of first through holes (9) are provided on the fixing cover (23); the first bolt (24) is threadedly connected to the fixing cover (23) through the first through holes (9); the stop block (25) is arranged on the water inlet pipe (8); one end of the filter cartridge (21) abuts against the stop block (25); and the other end of the filter cartridge (21) abuts against the fixing cover (23).

3. A multistage centrifugal pump according to claim 2, characterized in that: The distance between the end of the filter tube (22) close to the water inlet pipe (8) and the centrifugal pump body (1) is greater than the distance between the end of the filter tube (22) far from the water inlet pipe (8) and the centrifugal pump body (1).

4. A multistage centrifugal pump according to claim 2, characterized in that: An impeller (11) is arranged in the centrifugal pump body (1), and the impeller (11) is sleeved on the input shaft of the centrifugal pump body (1). A plurality of impellers (11) are arranged.

5. A multistage centrifugal pump according to claim 4, characterized in that: The bottoms of the centrifugal pump body (1) and the driving motor (6) are both provided with a mounting seat (3), and the mounting seat (3) is provided with a second through hole (10).

6. A multistage centrifugal pump according to claim 2 or 5, characterized in that: A sealing gasket (7) is also provided on the fixed cover (23), and a surface of the sealing gasket (7) away from the fixed cover (23) is in contact with the filter tube (22).

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