Vertical multi-stage submersible pump

Abstract

The utility model relates to a vertical multi-stage submersible pump which comprises a motor and a pump body connected to the motor, the pump body comprises a water inlet section, a water outlet section and a plurality of pump shells which are fixed in an up-down stacked mode, the pump shells are arranged between the water inlet section and the water outlet section, and the vertical multi-stage submersible pump is characterized in that a flow guide shell is arranged in each pump shell; a semi-open impeller is arranged in the flow guide shell, a pump shaft is arranged in the pump shell, the pump shaft penetrates through the flow guide shell to be connected with the semi-open impeller, and the end of the pump shaft is connected with an output shaft of the motor. The problem that silt is blocked between the semi-open type impeller and the upper surface of the pump shell can be solved, abrasion of the semi-open type impeller can be reduced, and the service life of the semi-open type impeller is prolonged.

Description

Technical Field

[0001] This application relates to the technical field of submersible pumps, and in particular to a vertical multistage submersible pump. Background Technology

[0002] Currently, small submersible pumps are the most widely used pump products in rural areas, and their usage is also the largest. A multistage submersible pump includes a motor and a pump body. The pump body consists of several stacked pump casings. The uppermost pump casing has an outlet section, and the lowermost pump casing has an inlet section. A pump shaft is installed inside the pump casing and is connected to the motor's output shaft. A guide shell is installed inside the pump casing, and an impeller is installed inside the guide shell. The impeller is connected to the pump shaft via a key, allowing the pump shaft to transmit torque to the impeller.

[0003] During operation, the liquid enters the impeller flow channel from the impeller inlet, and after passing through the impeller flow channel, the liquid is thrown out to the guide shell. After passing through multiple guide shells, it is discharged from the outlet section.

[0004] Regarding the aforementioned technologies, the inventors believe that the impeller in a multi-stage submersible pump currently includes a front cover plate, a rear cover plate, and several blades. The blades are arranged between the front and rear cover plates, and impeller flow channels are formed between adjacent blades. When the impeller is working, when mud and sand enter the gap between the front cover plate and the pump casing, it can easily cause mud and sand blockage of the impeller, increasing the wear of the front cover plate and affecting the service life of the impeller. Therefore, there are certain areas for improvement. Utility Model Content

[0005] To improve the service life of the impeller, this application provides a vertical multistage submersible pump.

[0006] The vertical multistage submersible pump provided in this application adopts the following technical solution:

[0007] A vertical multistage submersible pump includes a motor and a pump body connected to the motor. The pump body includes an inlet section, an outlet section, and several pump casings stacked and fixed vertically. The several pump casings are disposed between the inlet section and the outlet section. Each pump casing is provided with a guide shell. A semi-open impeller is disposed within the guide shell. A pump shaft is disposed within the pump casing. The pump shaft passes through the guide shell to connect with the semi-open impeller. The end of the pump shaft is connected to the output shaft of the motor.

[0008] Preferably, the lower surface of the guide shell is provided with a receiving cavity, the semi-open impeller is housed in the receiving cavity, and the middle part of the guide shell is provided with a mounting shaft hole for the pump shaft to pass through.

[0009] The upper surface of the flow guide shell is provided with a plurality of flow guide plates, which are distributed in a vortex shape around the mounting shaft hole, and flow guide channels are formed between adjacent flow guide plates;

[0010] The edge of the flow guide shell is provided with several flow channels, which are used to connect the flow guide channel and the accommodating cavity.

[0011] Preferably, the flow channel includes a first flow groove and a second flow groove;

[0012] The first flow channel is disposed on the upper surface edge of the flow guide shell, the two side walls of the first flow channel are oriented in the same direction as the flow guide plate, and the bottom of the first flow channel is arc-shaped.

[0013] The second flow channel is disposed on the lower surface edge of the flow guide shell. The second flow channel is arc-shaped. One end of the second flow channel communicates with the first flow channel, and the other end of the second flow channel communicates with the accommodating cavity.

[0014] Preferably, the semi-open impeller includes a cover plate and several blades. A mounting sleeve is provided in the middle of the cover plate. The mounting sleeve extends in the axial direction. The pump shaft passes through the mounting sleeve and is connected to the mounting sleeve by a flat key. The several blades are distributed in a vortex shape with the mounting sleeve as the center, and an impeller flow channel is formed between adjacent blades.

[0015] Preferably, the lower surface of the blade is detachably provided with a wear-resistant strip.

[0016] Preferably, the blade has several slots spaced apart on its two side walls, and the wear-resistant strip has bent clips on both sides for engaging with the slots.

[0017] Preferably, the lower end of the water inlet section is fixed to the end cover of the motor, a plurality of pump housings are stacked one on top of the upper end of the water inlet section, and the water outlet section is disposed on the uppermost pump housing. The water inlet section, the plurality of pump housings and the water outlet section are fixed together by a limiting component.

[0018] Preferably, the limiting component includes a plurality of mounting ears disposed on the edges of the inlet section, a plurality of pump housings and the outlet section, wherein a mounting hole is provided through the mounting ear, and a pull rod is provided through the mounting hole. An upper locking nut and a lower locking nut are threadedly connected to both ends of the pull rod. The upper locking nut abuts against the mounting ear of the outlet section, and the lower locking nut abuts against the mounting ear of the inlet section.

[0019] In summary, this application includes at least one of the following beneficial technical effects:

[0020] In this application, when water containing silt is sucked into the pump body, the semi-open impeller structure results in a small effective contact area between the blades and the upper surface of the pump casing. This solves the problem of silt clogging between the semi-open impeller and the upper surface of the pump casing, reduces wear on the semi-open impeller, and improves its service life. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of a vertical multistage submersible pump.

[0022] Figure 2a This is a schematic diagram of the first structure of the pump casing.

[0023] Figure 2b This is a schematic diagram of the second structure of the pump casing.

[0024] Figure 3a This is a schematic diagram of the first structure of the flow guide shell.

[0025] Figure 3b This is a schematic diagram of the second structure of the flow guide shell.

[0026] Figure 4 This is a schematic diagram of the impeller installation.

[0027] Explanation of reference numerals in the attached drawings: 1. Motor; 2. Pump body; 21. Inlet section; 22. Outlet section; 23. Pump casing; 24. Mounting lug; 25. Mounting hole; 26. Guide shell; 27. Mounting cavity; 28. Mounting through hole; 29. ​​Semi-open impeller; 291. Cover plate; 292. Blade; 293. Mounting bushing; 30. Receptacle; 31. Mounting shaft hole; 32. Guide vane; 33. Flow channel; 331. First flow groove; 332. Second flow groove; 34. Wear-resistant strip; 35. Bending card. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0029] A vertical multistage submersible pump, referring to Figure 1 As shown, the device includes a motor 1 and a pump body 2 connected to the motor 1. The pump body 2 includes an inlet section 21, an outlet section 22, and several pump housings 23 stacked vertically. The lower end of the inlet section 21 is fixed to the end cover of the motor 1 by screws. Several pump housings 23 are stacked vertically between the inlet section 21 and the outlet section 22. The lowermost pump housing 23 is stacked on top of the inlet section 21, and the outlet section 22 is stacked on top of the uppermost pump housing 23. The inlet section 21, the several pump housings 23, and the outlet section 22 are fixed together by a limiting component.

[0030] The limiting assembly includes several mounting ears 24 disposed on the edges of the inlet section 21, several pump housings 23 and the outlet section 22. Each mounting ear 24 has a through mounting hole 25, through which a pull rod is inserted. The two ends of the pull rod are threaded with an upper locking nut and a lower locking nut. The upper locking nut abuts against the mounting ear 24 of the outlet section 22, and the lower locking nut abuts against the mounting ear 24 of the inlet section 21.

[0031] By aligning the mounting ears 24 of the inlet section 21, several pump housings 23 and the outlet section 22 in the axial direction, and then passing the tie rod through the mounting ears 24 of the inlet section 21, several pump housings 23 and the outlet section 22, the inlet section 21, several pump housings 23 and the outlet section 22 can be fixed together by the upper lock nut and the lower lock nut.

[0032] Reference Figure 2a and Figure 2b As shown, each pump housing 23 is provided with a flow guide shell 26, the lower surface of the pump housing 23 is provided with a mounting cavity 27, and the upper surface of the pump housing 23 is provided with a mounting through hole 28 in the middle, through hole 28 for the pump shaft to pass through. The flow guide shell 26 is housed in the mounting cavity 27 of the pump housing 23, and the outer wall of the flow guide shell 26 is in contact with the cavity wall of the mounting cavity 27.

[0033] Reference Figure 3a and Figure 3b As shown, a semi-open impeller 29 is provided inside the guide shell 26, and a pump shaft is provided inside the pump casing 23. The pump shaft passes through the guide shell 26 to connect with the semi-open impeller 29. The end of the pump shaft extends out of the pump casing 23 into the water inlet section 21. The end of the pump shaft is connected to the output shaft of the motor 1 through a coupling.

[0034] The lower surface of the guide shell 26 is provided with a receiving cavity 30, in which a semi-open impeller 29 is housed. The middle part of the guide shell 26 is provided with a mounting shaft hole 31 for the pump shaft to pass through. The upper surface of the guide shell 26 is provided with a plurality of guide vanes 32, which are distributed in a vortex shape around the mounting shaft hole 31, and a guide channel is formed between adjacent guide vanes 32.

[0035] The edge of the flow guide shell 26 is provided with several flow channels, which are used to connect the flow guide channel and the receiving cavity 30.

[0036] In this embodiment, the flow channel includes a first flow channel 331 and a second flow channel 332; the first flow channel 331 is disposed on the upper surface edge of the guide shell 26, the two side walls of the first flow channel 331 are oriented in the same direction as the guide plate 32, and the bottom of the first flow channel 331 is arc-shaped.

[0037] The second flow channel 332 is disposed on the lower surface edge of the flow guide shell 26. The second flow channel 332 is arc-shaped, and the arc direction of the second flow channel 332 is the same as the arc direction of the blade 292. One end of the second flow channel 332 is connected to the first flow channel 331, and the other end of the second flow channel 332 is connected to the accommodating cavity 30.

[0038] Reference Figure 4 As shown, the semi-open impeller 29 includes a cover plate 291 and several blades 292. A mounting sleeve 293 is provided in the middle of the cover plate 291. The mounting sleeve 293 extends in the axial direction. The pump shaft passes through the mounting sleeve 293 and is connected to the mounting sleeve 293 by a flat key. Several blades 292 are distributed in a vortex shape with the mounting sleeve 293 as the center, and impeller flow channels are formed between adjacent blades 292.

[0039] When the semi-open impeller 29 is installed in the guide shell 26, the blade 292 is located on the lower surface of the cover plate 291. There is a certain rotational clearance between the lower surface of the blade 292 and the upper surface of the pump casing 23. There is also a certain rotational clearance between the semi-open impeller 29 and the wall of the mounting cavity 27 of the guide shell 26.

[0040] Therefore, when the motor 1 drives the pump shaft to rotate, the pump shaft drives the semi-open impeller 29 to rotate, and a negative pressure is generated at the center of the semi-open impeller 29. The water enters the pump casing 23 through the inlet section 21. The water is thrown through the impeller flow channel and then through the guide shell 26. In the guide shell 26, the water passes through the second flow channel 332 and the first flow channel 331 and enters the guide channel. After passing through the guide channel, the water enters the upper stage pump casing 23 and is then discharged from the outlet section 22.

[0041] When sediment in the water is sucked into the pump body 2, the effective contact area between the blades 292 and the upper surface of the pump casing 23 is small due to the structure of the semi-open impeller 29. This solves the problem of sediment clogging between the semi-open impeller 29 and the upper surface of the pump casing 23, and reduces the wear of the semi-open impeller 29, thus improving its service life.

[0042] To further improve the wear resistance of the semi-open impeller 29, in this embodiment, a wear-resistant strip 34 is detachably provided on the lower surface of the blade 292. The wear-resistant strip 34 only covers the lower surface of the blade 292, and the direction of the wear-resistant strip 34 is the same as that of the blade 292. The wear-resistant strip 34 is made of stainless steel.

[0043] The wear-resistant strip 34 is designed to be detachable and can be replaced after it is damaged. Several slots are provided at intervals on both sides of the blade 292. Bending clips 35 are provided on both sides of the wear-resistant strip 34. After being bent, the bending clips 35 are used to engage with the slots, thereby fixing the wear-resistant strip 34 to the lower surface of the blade 292.

[0044] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A vertical multistage submersible pump, comprising a motor (1) and a pump body (2) connected to the motor (1), the pump body (2) comprising an inlet section (21), an outlet section (22) and a plurality of pump casings (23) stacked and fixed vertically, the plurality of pump casings (23) being disposed between the inlet section (21) and the outlet section (22), characterized in that, Each of the pump housings (23) is provided with a guide shell (26), a semi-open impeller (29) is provided in the guide shell (26), a pump shaft is provided in the pump housing (23), the pump shaft passes through the guide shell (26) to be connected to the semi-open impeller (29), and the end of the pump shaft is connected to the output shaft of the motor (1).

2. A vertical multistage submersible pump according to claim 1, characterized in that, The lower surface of the guide shell (26) is provided with a receiving cavity (30), the semi-open impeller (29) is housed in the receiving cavity (30), and the middle part of the guide shell (26) is provided with a mounting shaft hole (31) for the pump shaft to pass through. The upper surface of the flow guide shell (26) is provided with a plurality of flow guide plates (32), and the plurality of flow guide plates (32) are distributed in a vortex shape with the mounting shaft hole (31) as the center, and flow guide channels are formed between adjacent flow guide plates (32); The edge of the flow guide shell (26) is provided with a plurality of flow channels, which are used to connect the flow guide channel and the accommodating cavity (30).

3. A vertical multistage submersible pump according to claim 2, characterized in that, The flow channel includes a first flow groove (331) and a second flow groove (332); The first flow channel (331) is disposed on the upper surface edge of the flow guide shell (26). The two side walls of the first flow channel (331) are oriented in the same direction as the flow guide plate (32). The bottom of the first flow channel (331) is arc-shaped. The second flow channel (332) is disposed on the lower surface edge of the flow guide shell (26). The second flow channel (332) is arc-shaped. One end of the second flow channel (332) communicates with the first flow channel (331), and the other end of the second flow channel (332) communicates with the accommodating cavity (30).

4. A vertical multistage submersible pump according to claim 1, characterized in that, The semi-open impeller (29) includes a cover plate (291) and a plurality of blades (292). A mounting sleeve (293) is provided in the middle of the cover plate (291). The mounting sleeve (293) extends in the axial direction. The pump shaft passes through the mounting sleeve (293). The pump shaft is connected to the mounting sleeve (293) by a flat key. The plurality of blades (292) are distributed in a vortex shape with the mounting sleeve (293) as the center. An impeller flow channel is formed between adjacent blades (292).

5. A vertical multistage submersible pump according to claim 4, characterized in that, The lower surface of the blade (292) is detachably provided with a wear-resistant strip (34).

6. A vertical multistage submersible pump according to claim 5, characterized in that, The blade (292) has several slots spaced apart on both sides, and the wear-resistant strip (34) has bending clips (35) on both sides, which are used to engage with the slots.

7. A vertical multistage submersible pump according to claim 1, characterized in that, The lower end of the inlet section (21) is fixed on the end cover of the motor (1), and several pump housings (23) are stacked on top of each other on the upper end of the inlet section (21). The outlet section (22) is set on the uppermost pump housing (23). The inlet section (21), several pump housings (23) and the outlet section (22) are fixed together by a limiting component.

8. A vertical multistage submersible pump according to claim 7, characterized in that, The limiting component includes several mounting ears (24) disposed on the edges of the inlet section (21), several pump housings (23) and the outlet section (22). A mounting hole (25) is provided through the mounting ear (24), and a pull rod is provided through the mounting hole (25). The two ends of the pull rod are threaded with an upper locking nut and a lower locking nut. The upper locking nut abuts against the mounting ear (24) of the outlet section (22), and the lower locking nut abuts against the mounting ear (24) of the inlet section (21).

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