Multi-stage centrifugal pump

Abstract

The utility model discloses a multi-stage centrifugal pump which is favorable for improving the installation convenience. The multi-stage centrifugal pump comprises a motor, a rotating shaft, a pump seat and a plurality of stages of centrifugal pump bodies connected in sequence, the rotating shaft is rotatably mounted on the pump seat, the motor is mounted at the top of the pump seat, the rotating shaft is connected to the output end of the motor and drives the rotating shaft to rotate, the plurality of stages of centrifugal pump bodies are mounted at the bottom of the pump seat, and the rotating shaft penetrates through the centrifugal pump bodies. The multiple stages of centrifugal pumps are bound through the pull rod to be sequentially connected, the upper end of the pull rod is connected with a locking piece, the upper end and the lower end of the locking piece form a fixed end close to the pump base and an action end away from the pump base respectively, and the fixed end can be fixed to the pump base or separated from the pump base by operating the action end.

Description

TECHNICAL FIELD

[0001] The utility model relates to centrifugal pump field especially multistage centrifugal pump. BACKGROUND

[0002] Centrifugal pump is the pump that transports liquid by centrifugal force produced by impeller rotation, and multistage centrifugal pump is a kind of pump that two or more centrifugal pumps with the same function are connected together. In terms of fluid channel structure, the medium pressure release port of the first stage is communicated with the inlet of the second stage, and the medium pressure release port of the second stage is communicated with the inlet of the third stage, so that a multistage centrifugal pump is formed by series connection. The multistage centrifugal pump can meet different requirements by changing the number of pump stages (i.e. changing the number of impellers), so it has a wide range of applications. The multistage centrifugal pump mainly comprises a motor, a rotating shaft, centrifugal pump bodies connected in sequence and a pump base. The motor and the rotating shaft are respectively mounted on the pump base, and the centrifugal pump bodies connected in sequence are mounted on the pump base. The centrifugal pump bodies are connected to each other by screws or steel plates. Some of the screws are very close to the pump base, and the space available for operation is very limited, so it is difficult to operate the fixation of the screws, and the installation and disassembly are slightly inconvenient. Therefore, there is an urgent need for a multistage centrifugal pump that can help improve the installation convenience to overcome the above-mentioned defects. SUMMARY

[0003] The utility model aims at providing a kind of multistage centrifugal pump that can help improve the installation convenience.

[0004] To achieve the above-mentioned purpose, the multistage centrifugal pump of the utility model comprises a motor, a rotating shaft, a pump base and a plurality of stages of centrifugal pump bodies connected in sequence. The rotating shaft is rotatably mounted on the pump base. The motor is mounted on the top of the pump base. The rotating shaft is connected to the output end of the motor. The motor drives the rotating shaft to rotate. The plurality of stages of centrifugal pump bodies are mounted on the bottom of the pump base. The rotating shaft passes through the centrifugal pump bodies. The plurality of stages of centrifugal pump bodies are bound by tie rods to realize connection in sequence. The upper end of the tie rod is connected with a locking member. The upper and lower ends of the locking member respectively form a fixed end close to the pump base and a moving end away from the pump base. The fixed end can be fixed to the pump base or separated from the pump base by operating the moving end.

[0005] Preferably, the lower end of the tie rod is hooked to the centrifugal pump body at the lowermost end.

[0006] Preferably, a hanging hole is formed in the bottom of the centrifugal pump body at the lowermost end. The lower end of the tie rod forms a hook, and the hook is inserted into the hanging hole.

[0007] Preferably, the tie rod is in the shape of a straight piece and is attached to the side surface of the centrifugal pump body.

[0008] Preferably, a plurality of tie rods are provided, and the plurality of tie rods are arranged at equal angles on the side surface of the centrifugal pump body.

[0009] Preferably, a support column is mounted on the upper end of the tie rod, and the locking member passes through the support column to be connected with the pump base.

[0010] Preferably, the side wall of the pump base is formed with a mounting portion outward in the radial direction, the mounting portion is arranged opposite to the support column in sequence, and the fixed end of the locking member is detachably mounted on the mounting portion.

[0011] Preferably, the pump base comprises a base body and an output connector connected to the base body and outwardly offset relative to the base body, the output connector and the base body are provided with an output flow channel, and the bottom of the base body is concavely arranged to form an output groove, and the output flow channel is communicated with the output groove.

[0012] Preferably, the centrifugal pump body comprises a shell and an impeller arranged in the shell, the impeller is mounted on a rotating shaft, and each shell is sequentially connected from top to bottom.

[0013] Preferably, part of the centrifugal pump body further comprises a guide vane, and the guide vane is connected with the shell.

[0014] Compared with the prior art, the utility model uses the pull rod to bind each centrifugal pump body, so that each centrifugal pump body is sequentially connected, and the stability of installation is ensured. The upper end of the pull rod is connected with a locking member, the pull rod is fixed to the pump base through the locking member, the upper end of the locking member is formed with a fixed end and a moving end respectively, the moving end is away from the pump base, the space for operating the moving end is relatively large, the moving end can be conveniently operated, and the fixed end can be conveniently fixed to or separated from the pump base. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is the perspective view of the multi-stage centrifugal pump of the utility model.

[0016] Figure 2 is the right view of the multi-stage centrifugal pump of the utility model.

[0017] Figure 3 is the sectional view of the multi-stage centrifugal pump of the utility model after being cut along the A-A line. Figure 2

[0018] Figure 4 is the perspective view of the multi-stage centrifugal pump of the utility model after being separated from the motor, the rotating shaft and the pump base.

[0019] Figure 5 is the perspective view of the multi-stage centrifugal pump of the utility model after hiding the motor, the rotating shaft and the pump base, and being separated from the three pull rods and the locking members thereon.

[0020] Figure 6 is the perspective view of the multi-stage centrifugal pump of the utility model after hiding the motor, the rotating shaft and the pump base, and being separated from one pull rod and the locking member thereon. DETAILED DESCRIPTION

[0021] ​In order to explain the technical content and structural features of the utility model in detail, the following further description is made in combination with the embodiments and the accompanying drawings.

[0022] As Figures 1 to 6 The utility model provides a multistage centrifugal pump 100, including motor 10, shaft 20, pump base 30 and the sequentially connected several stage centrifugal pump body 40. Shaft 20 is installed in pump base 30 in rotation, and motor 10 is installed on the top of pump base 30, and shaft 20 is connected to the output end of motor 10, and motor 10 drives shaft 20 to rotate, and several stage centrifugal pump body 40 is installed on the bottom of pump base 30, and shaft 20 passes through centrifugal pump body 40, and several stage centrifugal pump body 40 is bound by pull rod 50 and sequentially connected. The upper end of pull rod 50 is connected with locking piece 60, and the upper and lower ends of locking piece 60 form fixed end 61 close to pump base 30 and action end 62 away from pump base 30 respectively, and fixed end 61 can be fixed to pump base 30 or separated from pump base 30 by operating action end 62. Centrifugal pump body 40 includes impeller 42 (see below) arranged inside, and impeller 42 is installed on shaft 20, and motor 10 drives the rotation of shaft 20, drives impeller 42 to rotate, so that the liquid is sucked into centrifugal pump body 40, and sequentially flows through each centrifugal pump body 40 from bottom to top, and the energy of liquid is continuously increased, and higher lift is obtained.

[0023] The utility model uses pull rod 50 to bind each centrifugal pump body 40, so that each centrifugal pump body 40 is sequentially connected, and the stability of installation is ensured. The upper end of pull rod 50 is connected with locking piece 60, and pull rod 50 is fixed to pump base 30 through locking piece 60, and the upper end of locking piece 60 forms fixed end 61 and action end 62 respectively, and fixed end 61 is close to pump base 30 and action end 62 is away from pump base 30, and the space of action end 62 can be operated is relatively large, and action end 62 can be conveniently operated, and fixed end 61 can be conveniently fixed to pump base 30 or separated from pump base 30.

[0024] As Figures 1 to 6As shown, the lower end of the pull rod 50 is hooked to the lowermost centrifugal pump body 40. Further, the bottom of the lowermost centrifugal pump body 40 is provided with a hanging hole 01, and the lower end of the pull rod 50 is formed with a hook 51 which is inserted into the hanging hole 01, so that the connection of the pull rod 50 and the centrifugal pump body 40 is more convenient. Preferably, the pull rod 50 is provided in a straight sheet shape, and the pull rod 50 is tightly attached to the side surface of the centrifugal pump body 40, so as to strengthen the supporting, limiting and fixing effect of the pull rod 50 on the centrifugal pump body 40. Preferably, the pull rod 50 is made of steel sheet, which has good toughness, strength and ductility, but according to actual needs, it can also be selected as a tape and the like. In the embodiment provided by the utility model, there are three pull rods 50, and the three pull rods 50 are arranged at equal angles on the side surface of the centrifugal pump body 40, and the distance between the two pull rods 50 is 120°. However, according to actual needs, more than four pull rods 50 can also be provided.

[0025] As shown in Figures 1 to 6 , the upper end of the pull rod 50 is provided with a supporting cylinder 52, and the locking piece 60 passes through the supporting cylinder 52 and is connected with the pump seat 30. The supporting cylinder 52 is arranged to support the locking piece 60, and preferably, the supporting cylinder 52 is installed on the upper end of the pull rod 50 by welding, but according to actual needs, it can also be installed on the upper end of the pull rod 50 by means of buckles. Further, the side wall of the pump seat 30 is formed with an installation portion 31 outwardly along the radial direction, the installation portion 31 is arranged opposite to the supporting cylinder 52, and the fixed end 61 of the locking piece 60 is detachably installed on the installation portion 31. The installation portion 31 is arranged to facilitate the connection between the fixed end 61 and the pump seat 30.

[0026] As shown in Figures 1 to 6 , the pump seat 30 comprises a seat body 32 and an output connector 33 which is connected to the seat body 32 and is outwardly offset relative to the seat body 32. The output connector 33 and the seat body 32 are provided with an output flow channel 34, and the bottom of the seat body 32 is concave to form an output groove 35, and the output flow channel 34 communicates with the output groove 35. The pumped liquid flows out from the output flow channel 34, and the output groove 35 is arranged to temporarily store the pumped liquid, so as to better distribute the liquid.

[0027] As shown in Figures 1 to 6As shown, the centrifugal pump body 40 comprises a shell 41 and an impeller 42 arranged in the shell 41, the impeller 42 is installed on the rotating shaft 20, and each shell 41 is sequentially connected from top to bottom. The motor 10 drives the rotating shaft 20 to rotate, and drives the impeller 42 to rotate in the shell 41, so that the liquid is sucked into the first stage impeller 42, and then the liquid is guided into the inlet of the next stage impeller 42 through the shell 41, and the liquid energy is continuously increased in this way, and higher lift is obtained. Preferably, in the embodiments provided by the utility model, there are four stages of centrifugal pump bodies 40, but the number is not limited. Preferably, part of the centrifugal pump body 40 further comprises a guide vane 43, and the guide vane 43 is connected with the shell 41. In the embodiments provided by the utility model, the two centrifugal pump bodies 40 in the middle comprise guide vanes 43, and the two centrifugal pump bodies 40 at the top and the bottom do not contain guide vanes 43, but the number is not limited.

[0028] The working process of the multi-stage centrifugal pump 100 of the utility model is briefly introduced as follows: the motor 10 drives the rotating shaft 20 to rotate, and drives the impeller 42 to rotate at high speed in the shell 41, the liquid is sucked into the first stage impeller 42, and then the liquid is guided into the next stage impeller 42 through the shell 41, and the liquid energy is continuously increased in this way, and higher lift is obtained. The pumped liquid flows out to the output groove 35 and then flows into the output flow channel 34, and finally is pumped to the water pipe and is output.

[0029] The above disclosure is only a preferred embodiment of the utility model, and cannot limit the scope of the utility model, therefore, equivalent changes made according to the utility model claims all belong to the scope covered by the utility model.

Claims

1. A multi-stage centrifugal pump characterized by: The utility model provides a centrifugal pump, comprising a motor, a rotating shaft, a pump base and a plurality of centrifugal pump bodies connected in sequence, the rotating shaft is rotatably installed on the pump base, the motor is installed on the top of the pump base, the rotating shaft is connected to the output end of the motor, the motor drives the rotating shaft to rotate, a plurality of centrifugal pump bodies are installed on the bottom of the pump base, the rotating shaft passes through the centrifugal pump bodies, a plurality of centrifugal pump bodies are bound by tie rods to realize the connection in sequence, the upper end of the tie rod is connected with a locking piece, the upper and lower ends of the locking piece are formed with a fixed end close to the pump base and a moving end away from the pump base respectively, the fixed end can be fixed on the pump base or separated from the pump base by operating the moving end.

2. The multi-stage centrifugal pump of claim 1, wherein, The lower end of the tie rod is hooked on the centrifugal pump body at the lowermost end.

3. The multi-stage centrifugal pump of claim 1, wherein, The bottom of the centrifugal pump body at the lowermost end is provided with a hanging hole, the lower end of the tie rod is formed with a hook, and the hook is inserted into the hanging hole.

4. The multi-stage centrifugal pump of claim 1, wherein, The tie rod is in the form of a straight sheet and is tightly attached to the side surface of the centrifugal pump body.

5. The multi-stage centrifugal pump of claim 1, wherein, A plurality of tie rods are arranged at equal angles on the side surface of the centrifugal pump body.

6. The multi-stage centrifugal pump of claim 1, wherein, The upper end of the tie rod is provided with a support column, and the locking piece passes through the support column and is connected to the pump base.

7. The multi-stage centrifugal pump of claim 6, wherein, The side wall of the pump base is formed with a mounting portion outward in the radial direction, the mounting portion is arranged opposite to the support column, and the fixed end of the locking piece is detachably mounted on the mounting portion.

8. The multi-stage centrifugal pump of claim 1, wherein, The pump base comprises a base body and an output connector connected to the base body and outwardly offset relative to the base body, the output connector and the base body are provided with an output flow channel, the bottom of the base body is concave to form an output groove, and the output flow channel is communicated with the output groove.

9. The multi-stage centrifugal pump of claim 1, wherein, The centrifugal pump body comprises a shell and an impeller arranged in the shell, the impeller is installed on the rotating shaft, and each shell is sequentially connected from top to bottom.

10. The multi-stage centrifugal pump of claim 9, wherein, Part of the centrifugal pump body further comprises a guide vane connected to the shell.

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