Middle-open type multi-section wear-resistant centrifugal pump

Abstract

The utility model discloses a middle-open type multi-section wear-resistant centrifugal pump which comprises a pump body, the pump body is provided with a shell and a rotating shaft located in the shell, a plurality of impellers are arranged on the periphery of the rotating shaft, and a throttling sleeve assembly is arranged at the tail end of the rotating shaft. The throttling sleeve assembly comprises an inner lining fixed on the rotating shaft and an outer lining fixed in the shell, a cavity is formed between the inner lining and the outer lining, the shell is further connected with a water injection pipe, the water injection pipe is communicated with the cavity, the other end of the water injection pipe is connected with a water injection device through a pipeline, and the pipeline is connected with a pressure gauge. Compared with the prior art, the water injection device can inject water into the cavity, so that the pressure in the cavity is higher than that in the containing cavity of the shell where the impeller is located, fluid in the containing cavity of the shell where the impeller is located is prevented from entering the cavity, and particulate matter in the fluid is prevented from abrading the cavity.

Description

Technical Field

[0001] The utility model relates to the technical field of gypsum slurry transportation, in particular to a split multi-section wear-resistant centrifugal pump. Background Art

[0002] During the operation of a split multi-stage pump, the fluid in the impeller cavity will ooze out through the throttle sleeve due to pressure. To solve this problem, a balance pipe is provided. One end of the balance pipe is connected to the pump inlet, and the other end is connected to the fluid oozing-out part of the pump throttle sleeve, so that the oozed fluid is sent back to the pump inlet through the balance pipe.

[0003] However, it is found that when transporting solid-containing slurry, due to the particulate matter in the slurry, these particulate matters will impact (abrade and brush) the inner space of the throttle sleeve during high-speed movement, and will also impact (abrade and brush) the inner wall of the balance pipe after entering the balance pipe, resulting in serious wear inside the throttle sleeve and the balance pipe. Regular shutdown for maintenance is required, and it is difficult to maintain the normal production rhythm. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a split multi-section wear-resistant centrifugal pump. The water injection device can inject water into the cavity, so that the pressure in the cavity is higher than the pressure in the housing cavity where the impeller is located, thereby preventing the fluid in the housing cavity where the impeller is located from entering the cavity and avoiding the wear of the particulate matter in the fluid on the cavity.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A split multi-section wear-resistant centrifugal pump includes a pump main body. The pump main body has a housing and a rotating shaft located inside the housing. A plurality of impellers are arranged around the rotating shaft. A throttle sleeve assembly is arranged at the end of the rotating shaft. The throttle sleeve assembly includes a lining sleeve fixed to the rotating shaft and an outer lining sleeve fixed to the housing. A cavity is formed between the lining sleeve and the outer lining sleeve. A water injection pipe is also connected to the housing. The water injection pipe communicates with the cavity and the other end of the water injection pipe is connected to a water injection device through a pipeline. A pressure gauge is connected to the pipeline.

[0007] Further, a protrusion is arranged on the outer side of the outer lining sleeve, and the protrusion is embedded in the housing.

[0008] Further, a mechanical water seal is arranged at the end of the throttle sleeve assembly away from the impeller.

[0009] Further, a throat bushing is arranged between the mechanical water seal and the throttle sleeve assembly. The throat bushing is sleeved around the rotating shaft and the throat bushing is fixed to the housing.

[0010] Further, a gap is left between the throat bushing and the rotating shaft.

[0011] Furthermore, the water injection device is a high-pressure water pump.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] The water injection device of the utility model can inject water into the cavity of the flow sleeve assembly, so that the pressure in the cavity is higher than the pressure in the housing cavity where the impeller is located, thereby preventing the fluid in the housing cavity where the impeller is located from entering the cavity of the flow sleeve assembly, so as to avoid the wear of the cavity caused by the particulate matter in the fluid.

[0014] A protrusion is arranged on the outer side of the outer bushing of the utility model, and the protrusion is embedded in the housing, which improves the connection stability between the outer bushing and the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic cross-sectional view of a split multi-stage wear-resistant centrifugal pump of the utility model.

[0016] Figure 2 It is a split multi-stage wear-resistant centrifugal pump of the utility model Figure 1 Enlarged schematic view of part A.

[0017] Figure 3 It is a schematic structural view of the throttle sleeve assembly of a split multi-stage wear-resistant centrifugal pump of the utility model.

[0018] In the figure: 1. Water injection device; 2. Pressure gauge; 3. Water injection pipe; 4. Throttle sleeve assembly; 401. Inner bushing; 402. Cavity; 403. Outer bushing; 4031. Protrusion; 5. Throat bushing; 6. Mechanical water seal; 8. Pump body; 9. Rotating shaft; 10. Housing; 11. Pipeline. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] In order to make the technical means, creative features, achieved purposes and effects of the utility model easy to understand, the utility model will be further described below in conjunction with specific embodiments.

[0020] As Figures 1-3 shown, a split multi-stage wear-resistant centrifugal pump includes a pump body 8. The pump body 8 is a split multi-stage wear-resistant pump, which is prior art and will not be elaborated here. The pump body 8 has a housing 10 and a rotating shaft 9 located in the housing 10. A plurality of impellers are arranged around the rotating shaft 9. A throttle sleeve assembly 4 is arranged at the end of the rotating shaft 9. The throttle sleeve assembly 4 includes an inner bushing 401 fixed on the rotating shaft 9 and an outer bushing 403 fixed in the housing 10. A cavity 402 is formed between the inner bushing 401 and the outer bushing 403. A water injection pipe 3 is also connected to the housing 10. The water injection pipe 3 communicates with the cavity 402 and the other end of the water injection pipe 3 is connected to a water injection device 1 through a pipeline 11. A pressure gauge 2 is connected to the pipeline 11. Among them, the water injection device 1 is a high-pressure water pump.

[0021] In this embodiment, as shown in Figure 1 , Figure 2 and Figure 3 , the cavity 402 communicates with the cavity of the housing 10 where the impeller is located. During use, to prevent the fluid in the cavity of the housing 10 where the impeller is located from entering the cavity 402, the water injection device 1 should be controlled to work. It can inject water into the cavity 402, so that the pressure in the cavity 402 is higher than the pressure in the cavity of the housing 10 where the impeller is located, thereby preventing the fluid in the cavity of the housing 10 where the impeller is located from entering the cavity 402 and causing wear to the cavity 402. During this process, the water in the cavity 402 will penetrate into the cavity of the housing 10 where the impeller is located. Therefore, the water injection device 1 needs to work continuously to ensure that the pressure in the cavity 402 is always higher than the pressure in the cavity of the housing 10 where the impeller is located. Moreover, in this wear-resistant pump, the balance pipe is not provided, simplifying the structure.

[0022] The water injection device 1 injects water into the cavity 402 through the pipeline 11. Therefore, the pressure gauge 2 can detect the pressure condition in the cavity 402 through the pipeline 11.

[0023] Among them, as shown in Figure 2 , a protrusion 4031 is provided on the outer side of the outer bushing 403, and the protrusion 4031 is embedded in the housing 10 to improve the connection stability between the outer bushing 403 and the housing 10. The inner bushing 401 will rotate with the rotating shaft 9, while the outer bushing 403 will not rotate with the rotating shaft 9.

[0024] Among them, as shown in Figure 1 and Figure 2 , a mechanical seal 6 is provided at the end of the throttle sleeve assembly 4 away from the impeller. The mechanical seal 6 is a prior art and will not be elaborated here. To prevent the water in the cavity 402 from leaking to the mechanical seal 6, therefore, the pressure of the mechanical seal 6 here needs to be adjusted to be the same as the internal pressure of the cavity 402. Moreover, a throat bushing 5 is provided between the mechanical seal 6 and the throttle sleeve assembly 4. The throat bushing 5 is sleeved around the rotating shaft 9 and the throat bushing 5 is fixed in the housing 10. There is a gap between the throat bushing 5 and the rotating shaft 9, and the throat bushing 5 can further reduce the mutual leakage between the mechanical seal 6 and the liquid in the cavity 402.

[0025] Working principle: Connect the water injection device 1 to the water supply pipeline. When the wear-resistant pump pumps materials, the water injection device 1 should be controlled to work. It can inject water into the cavity 402, so that the pressure in the cavity 402 is higher than the pressure in the cavity of the housing 10 where the impeller is located, thereby preventing the fluid in the cavity of the housing 10 where the impeller is located from entering the cavity 402, and the particles contained in the fluid from causing wear to the cavity 402. Moreover, during this process, the water in the cavity 402 will penetrate into the cavity of the housing 10 where the impeller is located. Therefore, the water injection device 1 needs to work continuously to ensure that the pressure in the cavity 402 is always higher than the pressure in the cavity of the housing 10 where the impeller is located.

[0026] The above shows and describes the basic principle, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the description in the specification only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A split-type multi-section wear-resistant centrifugal pump, comprising a pump body (8), the pump body (8) having a casing (10) and a rotating shaft (9) located in the casing (10), a plurality of impellers being arranged on the periphery of the rotating shaft (9), characterized in that: A throttling sleeve assembly (4) is provided at the end of the rotating shaft (9), the throttling sleeve assembly (4) comprising an inner sleeve (401) fixed on the rotating shaft (9) and an outer sleeve (403) fixed in the shell (10), a cavity (402) is formed between the inner sleeve (401) and the outer sleeve (403), and a water injection pipe (3) is also connected to the shell (10), the water injection pipe (3) is connected to the cavity (402), and the other end of the water injection pipe (3) is connected to a water injection device (1) via a pipe (11), and a pressure gauge (2) is connected to the pipe (11).

2. A split-center multi-section wear-resistant centrifugal pump according to claim 1, characterized in that: A protrusion (4031) is provided on the outside of the outer bushing (403), and the protrusion (4031) is embedded in the housing (10).

3. A split-center multi-section wear-resistant centrifugal pump according to claim 1 or 2, characterized in that: The end of the throttling sleeve assembly (4) away from the impeller is provided with a mechanical water seal (6).

4. A split-center multi-section wear-resistant centrifugal pump according to claim 3, characterized in that: A throat bushing (5) is provided between the mechanical water seal (6) and the throttling sleeve assembly (4); the throat bushing (5) is sleeved on the periphery of the rotating shaft (9) and the throat bushing (5) is fixed in the housing (10).

5. A split-center multi-section wear-resistant centrifugal pump according to claim 4, characterized in that: A gap is left between the throat bushing (5) and the rotating shaft (9).

6. The split-center multi-section wear-resistant centrifugal pump according to claim 1, characterized in that: The water injection device (1) is a high-pressure water pump.

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