Immersed pump and assembly method thereof

Abstract

The invention discloses an immersed pump and an assembling method thereof.The immersed pump comprises a pump head located at the upper position, a base located at the lower position and a pump shell arranged between the pump head and the base, and a motor and an impeller volute mechanism are further arranged in the pump shell and located between the pump head and the base; a motor shaft of the motor is in transmission connection with the top end of a rotating shaft of the impeller volute mechanism through a coupler, and the impeller volute is characterized in that a universal joint mechanism is arranged between the bottom end of the rotating shaft and the base, and the bottom end of the rotating shaft is connected with the base through the universal joint mechanism. When the submersible pump is assembled, the assembly problems of rotating shaft suffocation and the like caused by machining errors and assembly errors can be avoided, normal work of the submersible pump is guaranteed, and the service life of the submersible pump is prolonged.

Description

Technical Field

[0001] The invention relates to a pump and an assembly method thereof, in particular to a submersible pump and an assembly method thereof, and belongs to the technical field of mechanical engineering and fluid dynamics. Background Art

[0002] A submersible pump is a pump product that is fully or partially immersed in the pumped liquid. When the submersible pump is powered on, the motor starts to run and drives the pump shaft and impeller to rotate through a mechanical transmission device. At this time, the liquid will flow in from the impeller inlet and be thrown out by the impeller at high speed, so that a certain vacuum is formed in the center of the impeller. Under the action of the atmospheric pressure on the liquid surface, the liquid will be continuously pressed into the pipeline through devices such as filters to form a continuous liquid flow. The submersible pump has many advantages, such as compact structure, small size, light weight, easy installation, simple operation, stable performance, easy maintenance, etc. At the same time, it also has high efficiency and long service life, and can adapt to various complex working environments.

[0003] like Figure 1 and Figure 2 As shown, a submersible pump is cylindrical, comprising a pump head 1 located at an upper position, a base 2 located at a lower position, and a pump casing 3 arranged between the pump head 1 and the base 2. A motor 4 and an impeller volute mechanism 5 are also arranged in the pump casing 3 and between the pump head 1 and the base 2. The motor 4 is located at an upper position, and the impeller volute mechanism 5 is located at a lower position. The motor shaft 411 of the motor 4 is connected to the rotating shaft 511 of the impeller volute mechanism 5 through a coupling 6, so that the rotating shaft 511 can be driven to rotate by the motor 4. During operation, the liquid enters the impeller volute mechanism 5 from the base 2, and then enters the pump head 1 from the impeller volute mechanism 5 through the channel between the motor 4 and the pump casing 3, and is finally discharged from the pump head 1.

[0004] The connection structure of the two ends of the rotating shaft 511 is as follows: the top end of the rotating shaft 511 is connected to the motor shaft 411 through the coupling 6, a base through hole is opened on the base 2, a graphite sleeve 7 is installed in the base through hole by interference pressure, and the bottom end of the rotating shaft 511 is inserted into the graphite sleeve 7 and connected with the graphite sleeve 7 by clearance fit. Here, since the fitting clearance H between the outer circumference of the rotating shaft 511 and the inner circumference of the graphite sleeve 7 is very small, generally only a few threads, the problem existing in the prior art is that during actual assembly, due to reasons such as component processing errors and assembly errors, the rotating shaft 511 cannot be guaranteed to be in a completely vertical state after assembly, and the rotating shaft 511 is often slightly tilted at a certain angle, so that the bottom end of the rotating shaft 511 is easily in contact with the graphite sleeve 7, thereby causing the rotating shaft 511 to be suffocated, and the normal operation of the submersible pump cannot be guaranteed and the service life of the submersible pump is reduced.

[0005] A Chinese invention patent application with application publication number CN108131297A and application publication date June 8, 2018 discloses a submersible pump, the submersible pump comprising a hydraulic motor, a motor seat, a pump shaft, an upper pump cover, a lower pump cover and a pump head assembly, the pump head assembly comprising a pump head housing and an impeller arranged in the pump head housing, the hydraulic motor being arranged on the motor seat, the output shaft of the hydraulic motor being coaxially and detachably connected to one end of the pump shaft, the other end of the pump shaft being connected to the impeller, the upper pump cover being arranged on the hydraulic motor, one end of the upper pump cover being connected to the motor seat, the other end of the upper pump cover being provided with an opening for installing a hydraulic pipeline driving the hydraulic motor, the lower pump cover comprising a shaft tube, the shaft tube being coaxially sleeved on the pump shaft, one end of the shaft tube being detachably connected to the upper pump cover, and the other end of the shaft tube being detachably connected to the pump head housing.

[0006] The above technical problems will occur when assembling the pump shaft of the submersible pump in the patent document, thereby making it impossible to ensure the normal operation of the submersible pump and reducing the service life of the submersible pump.

[0007] In summary, how to design a submersible pump and its assembly method so that during assembly, assembly problems such as shaft suffocation caused by processing errors and assembly errors can be avoided, the normal operation of the submersible pump can be ensured, and the service life of the submersible pump can be increased is a technical problem that needs to be solved urgently. Summary of the invention

[0008] The technical problem to be solved by the present invention is to provide a submersible pump and an assembly method thereof in view of the defects existing in the prior art. During assembly, assembly problems such as shaft suffocation caused by processing errors and assembly errors can be avoided, thereby ensuring the normal operation of the submersible pump and increasing the service life of the submersible pump.

[0009] In order to solve the above technical problems, the technical solution adopted by the present invention is: a submersible pump, comprising a pump head located at an upper position, a base located at a lower position and a pump casing arranged between the pump head and the base, a motor and an impeller volute mechanism are also arranged in the pump casing and between the pump head and the base, the motor shaft of the motor is connected to the top end of the rotating shaft of the impeller volute mechanism through a coupling, a universal joint mechanism is arranged between the bottom end of the rotating shaft and the base, and the bottom end of the rotating shaft and the base are connected through the universal joint mechanism.

[0010] Preferably, the universal joint mechanism includes a lower connecting column arranged on the base, an upper connecting column arranged on the bottom end of the rotating shaft and a sphere; a spherical surface 1 is arranged on one end of the lower connecting column, and a spherical surface 2 is arranged on one end of the upper connecting column, and the sphere is arranged between the spherical surface 1 and the spherical surface 2, the spherical surface 1 is in mating contact with one end of the sphere, and the spherical surface 2 is in mating contact with the other opposite end of the sphere.

[0011] Preferably, the lower connecting column and the upper connecting column are made of graphite material, and the sphere is a zirconia ceramic sphere.

[0012] Preferably, liquid storage hole 1 and liquid storage hole 2 are respectively arranged on spherical surface 1 of the lower connecting column and spherical surface 2 of the upper connecting column.

[0013] Preferably, liquid grooves are provided on spherical surface 1 of the lower connecting column and spherical surface 2 of the upper connecting column. The liquid groove on spherical surface 1 is connected to liquid storage hole 1, and the liquid groove on spherical surface 2 is connected to liquid storage hole 2.

[0014] Preferably, the impeller volute mechanism further comprises a volute and an impeller, the impeller is connected to a rotating shaft, the rotating shaft with the impeller is arranged inside the volute, and the rotating shaft and the volute are a separate structure; The coupling includes a cylinder, a countersunk hole 1 arranged on one end face of the cylinder, and a countersunk hole 2 arranged on the other end face of the cylinder. The top end of the rotating shaft is locked in the countersunk hole 2 through a connecting piece, so that the rotating shaft and the coupling form an integrated structure. An internal spline is arranged on the inner circumferential surface of the countersunk hole 1, and an external spline is arranged on the outer circumferential surface of one end of the motor shaft. One end of the motor shaft is inserted into the countersunk hole 1 and a spline connection structure is formed by the cooperation of the internal spline and the external spline, so that the motor shaft and the rotating shaft are connected in a transmission manner; when the connection is completed, a positive gap H1 is left between the end face of one end of the motor shaft and the inner bottom surface of the countersunk hole 1.

[0015] The present invention also discloses an assembly method of the submersible pump as described above, which is to first invert the pump head on the ground, then connect one end of the motor to the pump head, then place the impeller volute mechanism on the other end of the motor and connect the motor shaft to the rotating shaft of the impeller volute mechanism through a coupling, then place a ball on the lower connecting column of the rotating shaft, then sleeve the pump casing connected to the base on the pump head, and use the base to tighten the impeller volute mechanism to the other end of the motor. At this time, the motor, the impeller volute mechanism and the ball are all located inside the pump casing. After assembly, under the action of gravity, the motor The end face of one end of the shaft is in contact with the inner bottom surface of the countersunk hole 1 of the coupling, and at the same time, an inverted gap H2 appears between the sphere and the spherical surface 1 of the lower connecting column; finally, the assembled submersible pump is turned over and placed upright on the ground. Under the action of gravity, an upright gap H1 appears between the end face of one end of the motor shaft and the inner bottom surface of the countersunk hole 1 of the coupling. At the same time, under the action of gravity, one end of the sphere is in contact with the spherical surface 1 of the lower connecting column, that is, the inverted gap H2 becomes zero, and the other end of the sphere is also in contact with the spherical surface 2 of the upper connecting column. At this time, the assembly of the submersible pump is completed.

[0016] The beneficial effects of the present invention are as follows: the present invention modifies the clearance fitting connection structure between the bottom end of the rotating shaft and the graphite sleeve in the prior art into a universal joint connection structure, so that even if the rotating shaft is slightly tilted at a certain angle after assembly due to component processing errors and assembly errors, the bottom end of the rotating shaft is connected to the base through a universal joint mechanism, so that the rotating shaft will not be suffocated, and the normal rotation of the rotating shaft is guaranteed, thereby ensuring the normal operation of the submersible pump and improving the service life of the submersible pump. When the rotating shaft rotates, the friction pair formed between the lower connecting column and the upper connecting column made of zirconia ceramic sphere and graphite is used to achieve the effect of self-lubrication, thereby improving the service life of the product. By respectively providing a liquid storage hole 1 and a liquid storage hole 2 on the spherical surface 1 of the lower connecting column and the spherical surface 2 of the upper connecting column, when the submersible pump leaves the liquid and the rotating shaft is still rotating, the liquid stored in the liquid storage hole 1 and the liquid storage hole 2 can lubricate the spherical surface 1 of the lower connecting column, the sphere and the spherical surface 2 of the upper connecting column, further reducing wear and improving the service life. By designing an assembly method for the submersible pump with a special structure in the present application, the assembly steps are simplified and the assembly efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of an axial cross-sectional structure of a submersible pump in the prior art; Figure 2 for Figure 1 The enlarged structural diagram of the middle A part; Figure 3 It is a schematic diagram of the axial cross-sectional structure of the submersible pump in an upright position according to an embodiment of the present invention; Figure 4 It is a schematic diagram of the axial cross-sectional structure of the impeller volute mechanism in an embodiment of the present invention; Figure 5 for Figure 3 A schematic diagram of the enlarged structure of the middle B part; Figure 6 This is a bottom view structural diagram of an upper connecting column in an embodiment of the present invention; Figure 7 for Figure 3 The enlarged structural diagram of the middle C part; Figure 8 A schematic diagram of a partial axial cross-sectional structure at the sphere when the submersible pump is inverted for assembly of an embodiment of the present invention; In the figure: 1. pump head, 2. base, 3. pump casing, 4. motor, 411. motor shaft, 5. impeller volute mechanism, 511. rotating shaft, 512. volute, 513. impeller, 6. coupling, 611. column, 612. countersunk hole 1, 613. countersunk hole 2, 7. graphite sleeve, 8. liquid flow channel, 9. lower connecting column, 10. upper connecting column, 11. sphere, 12. rotating shaft sleeve, 13. cover body, 14. liquid storage hole 1, 15. liquid storage hole 2, 16. spherical surface 2, 17. liquid tank, 18. screw, 19. spline connection structure, 20. tightening bolt. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] Example: Figure 3 As shown, a submersible pump is cylindrical, comprising a pump head 1 located at an upper position, a base 2 located at a lower position, and a pump housing 3 disposed between the pump head 1 and the base 2. A motor 4 and an impeller volute mechanism 5 are also disposed in the pump housing 3 and between the pump head 1 and the base 2. The motor 4 is located at an upper position, and the impeller volute mechanism 5 is located at a lower position. The motor shaft 411 of the motor 4 is connected to the rotating shaft 511 of the impeller volute mechanism 5 through a coupling 6, so that the rotating shaft 511 can be driven to rotate by the motor 4. Figure 4 As shown, the impeller volute mechanism 5 also includes a volute 512 and an impeller 513, and the impeller 513 is connected to the rotating shaft 511. In this embodiment, a plurality of impellers 513 are provided, and the plurality of impellers 513 are sequentially connected to the rotating shaft 511 along the axial direction of the rotating shaft 511. Here, only one impeller 513 may be provided. The rotating shaft 511 with the impeller is provided inside the volute 512, and the rotating shaft 511 and the volute 512 are split structures and can move relative to each other. A liquid flow channel 8 is formed between the rotating shaft 511 with the impeller and the volute 512. As shown in FIG. Figure 5As shown, a lower connecting column 9 is provided on the base 2 located at the bottom end of the rotating shaft 511, and a spherical surface 1 is provided on one end of the lower connecting column 9. An upper connecting column 10 is provided on the bottom end of the rotating shaft 511, and a spherical surface 2 is provided on one end of the upper connecting column 10. A sphere 11 is provided between the spherical surface 1 and the spherical surface 2. The spherical surface 1 is in mating contact with one end of the sphere 11, and the spherical surface 2 is in mating contact with the other end of the sphere 11. The lower connecting column 9, the sphere 11 and the upper connecting column 10 form a universal joint mechanism, so that the bottom end of the rotating shaft 511 is connected to the base 2 through the universal joint mechanism. In this embodiment, the clearance fit connection structure between the bottom end of the rotating shaft and the graphite sleeve in the prior art is changed, and a universal joint structure is used to connect the bottom end of the rotating shaft and the base. In this way, even if the rotating shaft is slightly tilted at a certain angle after assembly due to component processing errors and assembly errors, the bottom end of the rotating shaft is connected to the base through a universal joint mechanism. This will not cause the rotating shaft to be suffocated, thereby ensuring the normal rotation of the rotating shaft, thereby ensuring the normal operation of the submersible pump and increasing the service life of the submersible pump.

[0020] In order to further improve the service life, the lower connecting column 9 and the upper connecting column 10 can be made of graphite material, and the sphere 11 can be a ceramic sphere, preferably a zirconia ceramic sphere. In this way, when the shaft rotates, the friction pair formed between the zirconia ceramic sphere and the lower connecting column and the upper connecting column made of graphite can achieve a self-lubricating effect, thereby improving the service life of the product.

[0021] like Figure 5 and Figure 6 As shown, a shaft sleeve 12 is sleeved on the bottom end of the shaft 511, one end of the shaft sleeve 12 is sleeved on the bottom end of the shaft 511, and the upper connecting column 10 is pressed into the other end of the shaft sleeve 12, so that the upper connecting column 10 is connected to the bottom end of the shaft 511. A cover body 13 is also provided on the base 2, and the lower connecting column 9 is pressed into the cover body 13, so that the lower connecting column 9 is connected to the base 2.

[0022] A liquid storage hole 14 and a liquid storage hole 2 15 are respectively arranged on the spherical surface 1 of the lower connecting column 9 and the spherical surface 2 of the upper connecting column 10. When the submersible pump is working in the liquid, as the rotating shaft 511 rotates, part of the liquid will flow into the liquid storage hole 14 and the liquid storage hole 2 15 for storage. When the submersible pump leaves the liquid and the rotating shaft 511 is still rotating, the liquid stored in the liquid storage hole 14 and the liquid storage hole 2 15 can lubricate the spherical surface 1 of the lower connecting column 9, the sphere 11 and the spherical surface 2 of the upper connecting column 10, further reducing wear and improving service life. A liquid groove 17 is also arranged on the spherical surface 1 of the lower connecting column 9 and the spherical surface 2 16 of the upper connecting column 10. The liquid groove 17 on the spherical surface 1 is connected to the liquid storage hole 14, and the liquid groove 17 on the spherical surface 2 is connected to the liquid storage hole 2 15, which makes it easier for the liquid to flow into the liquid storage hole for storage. In this embodiment, a plurality of liquid grooves 17 are arranged.

[0023] like Figure 7 As shown, the coupling 6 includes a column 611, a countersunk hole 1 612 arranged on one end face of the column 611 and a countersunk hole 2 613 arranged on the other end face of the column 611. The top end of the rotating shaft 511 is locked in the countersunk hole 2 613 by a connecting piece such as a screw 18, so that the rotating shaft 511 and the coupling 6 form an integrated structure. An internal spline is arranged on the inner circumferential surface of the countersunk hole 1 612, and an external spline is arranged on the outer circumferential surface of one end of the motor shaft 411. One end of the motor shaft 411 is inserted into the countersunk hole 1 612 to form a spline connection structure 19 through the cooperation of the internal spline and the external spline, so that the motor shaft 411 and the rotating shaft 511 are connected by transmission. After the connection is completed, a positive clearance H1 is left between the end face of one end of the motor shaft 411 and the inner bottom face of the countersunk hole 1 612. Since the motor shaft 411 and the rotating shaft 511 are spline-connected, the positive clearance H1 enables the rotating shaft 511 with the coupling 6 to move a certain distance in the axial direction relative to the motor shaft 411. However, the motor shaft 411 and the rotating shaft 511 cannot rotate relative to each other to ensure the transmission of the working torque. This design can ensure the normal rotation of the rotating shaft during operation and further avoid the problem of the rotating shaft being stuck, thereby ensuring the normal operation of the work.

[0024] In order to realize the assembly of the submersible pump of the above structure, this embodiment also discloses an assembly method, which can be referred to Figure 3, which is to first turn the pump head 1 180 degrees and invert it on the ground, and then connect one end of the motor 4 to the pump head 1. At this time, the motor 4 is located at the upper position and the pump head 1 is located at the lower position. Then, the impeller volute mechanism 5 is placed on the other end of the motor 4 and the motor shaft 411 is connected to the rotating shaft 511 of the impeller volute mechanism 5 through the coupling 6. Then, the ball 11 is placed on the lower connecting column 9 of the rotating shaft 511, and then the pump housing 3 connected with the base 2 is sleeved on the pump head 1, and the impeller volute mechanism is connected by the base 2. 5 is tightened on the other end of the motor 4. At this time, the motor 4, the impeller volute mechanism 5 and the ball 11 are all located inside the pump housing 3. Here, the impeller volute mechanism 5 can also be tightened on the other end of the motor 4 by using the tightening bolts 20 on the base 2. After assembly, at this time, under the action of gravity, the coupling 6 with the rotating shaft 511 moves relative to the motor shaft 411, so that the end surface of one end of the motor shaft 411 contacts the inner bottom surface of the counterbore 612 of the coupling, that is, the positive clearance H1 becomes zero, as shown in FIG. Figure 8 As shown, under the action of gravity, the sphere 11 is also in contact with the spherical surface 2 of the upper connecting column 10, and an inverted gap H2 appears between the sphere 11 and the spherical surface 1 of the lower connecting column 9; finally, the assembled submersible pump is turned over 180 degrees again and placed upright on the ground. At this time, under the action of gravity, Figure 7 As shown, the coupling 6 with the rotating shaft 511 moves again relative to the motor shaft 411, so that a positive gap H1 appears between the end surface of one end of the motor shaft 411 and the inner bottom surface of the counterbore 612 of the coupling, as shown in FIG. Figure 5 As shown, under the action of gravity, one end of the sphere 11 is also in contact with the spherical surface 1 of the lower connecting column 9, that is, the inverted gap H2 becomes zero, and the other end of the sphere 11 is also in contact with the spherical surface 2 of the upper connecting column 10, and the assembly of the submersible pump is completed. By designing the above assembly method, the assembly of the submersible pump with a special structure in this embodiment is realized, the assembly steps are simplified, and the assembly efficiency is improved.

[0025] In summary, the present invention modifies the clearance fit connection structure between the bottom end of the rotating shaft and the graphite sleeve in the prior art into a universal joint connection structure, so that even if the rotating shaft is slightly tilted at a certain angle after assembly due to component processing errors and assembly errors, the bottom end of the rotating shaft is connected to the base through a universal joint mechanism, which will not cause the rotating shaft to be stuck, thereby ensuring the normal rotation of the rotating shaft, thereby ensuring the normal operation of the submersible pump and improving the service life of the submersible pump. When the rotating shaft rotates, the friction pair formed between the lower connecting column and the upper connecting column made of zirconia ceramic sphere and graphite is used to achieve the effect of self-lubrication, thereby improving the service life of the product. By respectively providing a liquid storage hole 1 and a liquid storage hole 2 on the spherical surface 1 of the lower connecting column and the spherical surface 2 of the upper connecting column, when the submersible pump leaves the liquid and the rotating shaft is still rotating, the liquid stored in the liquid storage hole 1 and the liquid storage hole 2 can lubricate the spherical surface 1 of the lower connecting column, the sphere and the spherical surface 2 of the upper connecting column, further reducing wear and improving service life. By designing an assembly method for the submersible pump with a special structure in the present application, the assembly steps are simplified and the assembly efficiency is improved.

[0026] The "multiple" mentioned in the embodiments refers to the number of "two or more". The above embodiments are only used to illustrate the present invention, not to limit the present invention. Those skilled in the relevant technical field can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the protection scope of the present invention, and the protection scope of the present invention should be defined by the claims.

Claims

1. A submersible pump, comprising a pump head located at an upper position, a base located at a lower position, and a pump housing arranged between the pump head and the base, wherein a motor and an impeller volute mechanism are also arranged in the pump housing and between the pump head and the base, wherein the motor shaft of the motor is drivingly connected to the top end of the rotating shaft of the impeller volute mechanism through a coupling, and characterized in that: A universal joint mechanism is arranged between the bottom end of the rotating shaft and the base, and the bottom end of the rotating shaft and the base are connected by the universal joint mechanism.

2. The submersible pump according to claim 1, characterized in that: The universal joint mechanism includes a lower connecting column arranged on the base, an upper connecting column arranged on the bottom end of the rotating shaft and a sphere; a spherical surface 1 is arranged on one end of the lower connecting column, and a spherical surface 2 is arranged on one end of the upper connecting column. The sphere is arranged between the spherical surface 1 and the spherical surface 2, the spherical surface 1 is in mating contact with one end of the sphere, and the spherical surface 2 is in mating contact with the other opposite end of the sphere.

3. The submersible pump according to claim 2, characterized in that: The lower connecting column and the upper connecting column are made of graphite material, and the sphere is a zirconia ceramic sphere.

4. The submersible pump according to claim 2 or 3, characterized in that: A liquid storage hole 1 and a liquid storage hole 2 are respectively arranged on the spherical surface 1 of the lower connecting column and the spherical surface 2 of the upper connecting column.

5. The submersible pump according to claim 4, characterized in that: Liquid grooves are also arranged on the spherical surface 1 of the lower connecting column and the spherical surface 2 of the upper connecting column. The liquid groove on the spherical surface 1 is connected with the liquid storage hole 1, and the liquid groove on the spherical surface 2 is connected with the liquid storage hole 2.

6. The submersible pump according to claim 2 or 3, characterized in that: The impeller volute mechanism also includes a volute and an impeller, wherein the impeller is connected to a rotating shaft, the rotating shaft with the impeller is arranged inside the volute, and the rotating shaft and the volute are a separate structure; The coupling includes a cylinder, a countersunk hole 1 arranged on one end face of the cylinder, and a countersunk hole 2 arranged on the other end face of the cylinder. The top end of the rotating shaft is locked in the countersunk hole 2 through a connecting piece, so that the rotating shaft and the coupling form an integrated structure. An internal spline is arranged on the inner circumferential surface of the countersunk hole 1, and an external spline is arranged on the outer circumferential surface of one end of the motor shaft. One end of the motor shaft is inserted into the countersunk hole 1 and a spline connection structure is formed by the cooperation of the internal spline and the external spline, so that the motor shaft and the rotating shaft are connected in a transmission manner; when the connection is completed, a positive gap H1 is left between the end face of one end of the motor shaft and the inner bottom surface of the countersunk hole 1.

7. An assembly method of a submersible pump according to claim 6, characterized in that: The method is to first invert the pump head on the ground, connect one end of the motor to the pump head, then place the impeller volute mechanism on the other end of the motor and connect the motor shaft to the rotating shaft of the impeller volute mechanism through a coupling, then place the ball on the lower connecting column of the rotating shaft, and then put the pump casing connected to the base on the pump head, and use the base to tighten the impeller volute mechanism to the other end of the motor. At this time, the motor, impeller volute mechanism and ball are all located inside the pump casing. After assembly, under the action of gravity, the end face of one end of the motor shaft is aligned with the counterweight of the coupling. The inner bottom surfaces of hole one are in contact with each other, and at the same time, an inverted gap H2 appears between the sphere and the spherical surface one of the lower connecting column; finally, the assembled submersible pump is turned over and placed upright on the ground. Under the action of gravity, an upright gap H1 appears between the end face of one end of the motor shaft and the inner bottom surface of countersunk hole one of the coupling. At the same time, under the action of gravity, one end of the sphere is in contact with the spherical surface one of the lower connecting column, that is, the inverted gap H2 becomes zero, and the other end of the sphere is also in contact with the spherical surface two of the upper connecting column. At this time, the assembly of the submersible pump is completed.

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