Assembling structure of impeller volute mechanism in immersed pump and immersed pump

Abstract

The utility model discloses an assembling structure of an impeller volute mechanism in an immersed pump and the immersed pump. The immersed pump further comprises a pump head located at the upper position. The base is positioned at a lower position; the pump shell is arranged between the pump head and the base; a motor; the motor and the impeller volute mechanism are arranged in the pump shell and located between the pump head and the base, and 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. The anti-leakage ring is arranged in the pump shell and located at the bottom end of the impeller volute mechanism, the bolt is arranged on the base, the bolt penetrates through the base to make contact with the anti-leakage ring, and therefore the impeller volute mechanism is fixed to the end face of one end of the motor in an abutting-against mode through the anti-leakage ring. According to the utility model, the impeller volute mechanism can be ensured to be assembled in place, so that the normal work of the immersed pump is ensured, and the assembly quality and the assembly efficiency of the immersed pump are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of assembly structure of submersible pump middle part and its submersible pump, especially a kind of assembly structure of impeller volute mechanism in submersible pump and submersible pump, belong to mechanical engineering and fluid dynamics technical field. BACKGROUND

[0002] Submersible pump is a kind of pump class product that is all or partially immersed in the liquid being pumped, when submersible pump is connected to power supply, motor starts to operate, and pump shaft and impeller are driven to rotate by mechanical transmission device. At this time, liquid will flow into from the impeller inlet, and be thrown out by impeller at high speed, so that a certain vacuum is formed in the center of impeller. Under the action of liquid surface atmospheric pressure, liquid will be continuously pressed into inlet pipe by filter screen and other devices, forming continuous liquid flow. 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] As shown in Figure 1 , a kind of submersible pump is cylindrical, which includes pump head 1 located at upper position, base 2 located at lower position and pump shell 3 arranged between pump head 1 and base 2, motor 4 and impeller volute mechanism 5 are also arranged in pump shell 3 and between pump head 1 and base 2, motor 4 is located at upper position, impeller volute mechanism 5 is located at lower position, motor shaft 411 of motor 4 is drivingly connected with rotating shaft 511 of impeller volute mechanism 5 through coupling 6, so that rotating shaft 511 can be driven to rotate by motor 4. When working, liquid enters into impeller volute mechanism 5 from base 2, then enters into pump head 1 from the passage between motor 4 and pump shell 3 through impeller volute mechanism 5, and finally is discharged from pump head 1.

[0004] As shown in Figure 3 , when assembling impeller volute mechanism in prior art, impeller volute mechanism 5 is pushed up by moving base 2 up, and finally impeller volute mechanism 5 is tightly fixed on one end face of motor 4. When assembling, in order to ensure that base 2 can tightly fix impeller volute mechanism 5 on one end face of motor 4 after moving up, as shown in Figure 4 , pump shell 3 and base 2 are split structure, and gap L is designed between pump shell 3 and base 2 when assembling, the distance that base 2 moves up is gap L, when base 2 moves up to position, i.e. gap L becomes zero, base 2 is limited by contacting pump shell 3 and base 2 at this time, and base 2 can tightly fix impeller volute mechanism 5 on one end face of motor 4.

[0005] However, the prior art has the problem that due to the machining error and assembly error of the parts, when the base 2 drives the impeller volute mechanism 5 to move up to the position, that is, the gap L becomes zero, there will still be some gap between the impeller volute mechanism 5 and the end face of one end of the motor 4, and the impeller volute mechanism 5 is not tightly fixed on the end face of one end of the motor 4, thereby affecting the normal work of the submersible pump and reducing the assembly quality and efficiency of the submersible pump.

[0006] After searching, no patent documents same or similar to the present application have been found.

[0007] In the patent document, when the pump shaft of the submersible pump is assembled, the above technical problems will occur, thereby unable to guarantee the normal work of the submersible pump and reducing the service life of the submersible pump.

[0008] Therefore, how to design an assembly structure of an impeller volute mechanism in a submersible pump and a submersible pump, which can avoid the problem of the impeller volute mechanism not being assembled to the position due to the machining error and assembly error of the parts, thereby guaranteeing the normal work of the submersible pump and improving the assembly quality and efficiency of the submersible pump is a technical problem to be solved. Utility model content

[0009] The utility model solves the technical problem in the prior art, provides an assembly structure of an impeller volute mechanism in a submersible pump and a submersible pump, which can avoid the problem of the impeller volute mechanism not being assembled to the position due to the machining error and assembly error of the parts, thereby guaranteeing the normal work of the submersible pump and improving the assembly quality and efficiency of the submersible pump.

[0010] To solve the above technical problem, the technical scheme adopted by the utility model is as follows: an assembly structure of an impeller volute mechanism in a submersible pump, the submersible pump further comprising a pump head located at an upper position, a base located at a lower position, a pump shell arranged between the pump head and the base, and a motor, wherein the motor and the impeller volute mechanism are arranged in the pump shell and located between the pump head and the base, the motor shaft of the motor is in transmission connection with the top end of the rotating shaft of the impeller volute mechanism through a shaft coupling, the assembly structure comprises an anti-leakage ring arranged in the pump shell and located on the bottom end of the impeller volute mechanism and a bolt arranged on the base, the bolt is in contact with the anti-leakage ring through the base, so that the impeller volute mechanism is tightly fixed on the end face of one end of the motor by using the anti-leakage ring.

[0011] Preferably, the base and the pump shell are an integral structure.

[0012] Preferably, a filter screen is further arranged on the bottom end of the base.

[0013] Preferably, a sealing ring is further arranged between the circumferential surface of the leakage-proof ring and the inner circumferential surface of the pump shell.

[0014] The utility model discloses still disclose a kind of submerged pump comprising the assembly structure according to as described above, universal joint mechanism is arranged between bottom end of rotating shaft and base, and bottom end of rotating shaft and base are connected by the universal joint mechanism.

[0015] Preferably, the universal joint mechanism includes a lower connecting column disposed on the base, an upper connecting column disposed on the bottom end of the rotating shaft, and a ball; a spherical surface one is disposed on one end of the lower connecting column, a spherical surface two is disposed on one end of the upper connecting column, the ball is disposed between the spherical surface one and the spherical surface two, the spherical surface one is in mating contact with one end of the ball, and the spherical surface two is in mating contact with the opposite end of the ball.

[0016] Preferably, the lower connecting column and the upper connecting column are made of graphite material, and the ball is a zirconia ceramic ball.

[0017] Preferably, a liquid storage hole one and a liquid storage hole two are respectively disposed on the spherical surface one of the lower connecting column and the spherical surface two of the upper connecting column.

[0018] Preferably, a liquid groove is further disposed on the spherical surface one of the lower connecting column and the spherical surface two of the upper connecting column, the liquid groove on the spherical surface one is in communication with the liquid storage hole one, and the liquid groove on the spherical surface two is in communication with the liquid storage hole two.

[0019] Preferably, the impeller volute mechanism further includes a volute and an impeller, the impeller is connected to the rotating shaft, the rotating shaft with the impeller is disposed inside the volute, and the rotating shaft and the volute are in a split structure.

[0020] The shaft coupling includes a column, a counterbore one disposed on one end surface of the column, and a counterbore two disposed on the other end surface of the column, the top end of the rotating shaft is locked in the counterbore two by a connecting piece, so that the rotating shaft and the shaft coupling form an integral structure, an internal spline is disposed on the inner circumferential surface of the counterbore one, an external spline is disposed on the outer circumferential surface of one end of the motor shaft, one end of the motor shaft is inserted into the counterbore one and forms a spline coupling structure by the internal spline and the external spline in cooperation, so as to drive connect the motor shaft and the rotating shaft; when connected, a normal gap H1 is left between the end surface of one end of the motor shaft and the inner bottom surface of the counterbore one.

[0021] The utility model discloses beneficial effect for: the utility model no longer utilizes base to go up and press from both sides impeller volute mechanism, but uses bolt on base to go up and press from both sides impeller volute mechanism, like this because bolt has very long screwing travel in its axial direction and screwing travel can be long or short, therefore even if there is the influence of part processing error and assembly error, can according to the actual assembly position of impeller volute mechanism, utilize bolt and press from both sides and fix on the one end face of motor. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the axial section structure schematic drawing of a submersible pump in prior art;

[0023] Figure 2 It is the enlarged structure schematic drawing of A part in Figure 1

[0024] Figure 3 It is the partial axial section structure schematic drawing of the bottom seat in Figure 1

[0025] Figure 4 It is the partial axial section structure schematic drawing of the base when impeller volute mechanism is pressed from both sides by base in prior art;

[0026] Figure 5 It is the axial section structure schematic drawing of the submersible pump when the utility model embodiment is right in

[0027] Figure 6 It is the partial axial section structure schematic drawing of the bottom seat in Figure 5 ​​​

[0028] Figure 7 This is an axial cross-sectional view of the impeller volute mechanism in an embodiment of this utility model.

[0029] Figure 8 for Figure 5 Enlarged structural diagram of section B in the middle;

[0030] Figure 9 This is a bottom view of the upper connecting column in an embodiment of the present invention;

[0031] Figure 10 for Figure 5 Enlarged structural diagram of section C;

[0032] Figure 11 A partial axial cross-sectional view of the submersible pump located at the sphere when it is inverted during assembly according to an embodiment of this utility model.

[0033] In the diagram: 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 one, 613. Countersunk hole two, 7. Graphite sleeve, 8. Leakage prevention ring, 9. Bolt, 10. Nut, 11. Filter screen, 12. Sealing ring, 13. Liquid flow channel, 14. Lower connecting column, 15. Upper connecting column, 16. Ball, 17. Rotating shaft sleeve, 18. Cover, 19. Liquid storage hole two, 20. Spherical surface two, 21. Liquid tank, 22. Screw, 23. Spline connection structure, 24. Liquid storage hole one. Detailed Implementation

[0034] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Example: Figure 5 As shown, a submersible pump is cylindrical, comprising a pump head 1 located at the top, a base 2 located at the bottom, and a pump casing 3 disposed between the pump head 1 and the base 2. A motor 4 and an impeller volute mechanism 5 are also disposed within the pump casing 3, located between the pump head 1 and the base 2. The motor 4 is located at the top, and the impeller volute mechanism 5 is located at the bottom. The motor shaft 411 of the motor 4 is connected to the rotating shaft 511 of the impeller volute mechanism 5 via a coupling 6, thereby enabling the motor 4 to drive the rotating shaft 511 to rotate. Figure 6A leakproof ring 8 is arranged inside the pump shell 3 and at the bottom end of the impeller volute mechanism 5, and a bolt 9 is arranged on the base 2, which is in contact with the leakproof ring 8 through the base 2, so that the impeller volute mechanism 5 is tightly fixed on the end face of the motor 4 by the leakproof ring 8. After being tightly fixed, the bolt 9 is locked on the base 2 by a nut 10. In the assembly of the embodiment, the pump head 1, the motor 4, the impeller volute mechanism 5, the leakproof ring 8, the pump shell 3 and the base 2 are assembled first, and then the bolt 9 is screwed to be in contact with the leakproof ring 8, so that the impeller volute mechanism 5 is tightly fixed on the end face of the motor 4 by the leakproof ring 8. It can be seen that the base is no longer used to tightly fix the impeller volute mechanism, but the bolt on the base is used to tightly fix the impeller volute mechanism. Since the bolt has a long screwing stroke in the axial direction and the screwing stroke can be long or short, even if there are part processing errors and assembly errors, the bolt can be used to tightly fix the impeller volute mechanism on the end face of the motor according to the actual assembly position of the impeller volute mechanism. In this way, during assembly, the problem of the impeller volute mechanism not being assembled in place due to part processing errors and assembly errors can be avoided, so that the normal work of the submersible pump is ensured, and the assembly quality and efficiency of the submersible pump are improved.

[0036] The base 2 and the pump shell 3 are an integral structure. In the embodiment, the bottom end of the pump shell 3 is welded on the base 2. When the pump head 1, the motor 4, the impeller volute mechanism 5 and the leakproof ring 8 are assembled, the base 2 and the pump shell 3 which are an integral structure can be sleeved on the pump head 1, so that the motor 4, the impeller volute mechanism 5 and the leakproof ring 8 are located inside the pump shell 3, and the assembly is completed by tightening the bolt 9, thereby further improving the assembly quality and efficiency of the submersible pump.

[0037] A filter screen 11 is arranged at the bottom end of the base 2. When the liquid enters the submersible pump from the base 2, the impurities in the liquid can be filtered out by the filter screen 11, so that the service life of the submersible pump is improved.

[0038] A sealing ring 12 is arranged between the circumferential surface of the leakproof ring 8 and the inner circumferential surface of the pump shell 3, so that the leakage of the liquid at this position is further prevented, and the normal work of the submersible pump is further operated.

[0039] In the prior art, there is another problem: Figure 2As shown, the connecting structure of the two ends of the rotating shaft 511 is that the top end of the rotating shaft 511 is in transmission connection with the motor shaft 411 through a shaft coupling 6, a base through hole is opened on the base 2, a graphite sleeve 7 is interference-pressed in the base through hole, and the bottom end of the rotating shaft 511 is inserted into the graphite sleeve 7 and in clearance fit connection with the graphite sleeve 7. Here, since the fit clearance H between the outer circumferential surface of the rotating shaft 511 and the inner circumferential surface of the graphite sleeve 7 is very small, generally only a few filaments, the problem in the prior art is that, in actual assembly, due to component machining errors and assembly errors and other reasons, the rotating shaft 511 cannot be guaranteed to be in a completely vertical state after assembly, and the rotating shaft 511 will often be slightly inclined at an angle, which makes the bottom end of the rotating shaft 511 easily contact the graphite sleeve 7, thereby causing the rotating shaft 511 to be choked, unable to guarantee the normal work of the submersible pump and reducing the service life of the submersible pump.

[0040] Therefore, in the submersible pump of the present embodiment, as shown in Figure 7 The impeller volute mechanism 5 further comprises a volute 512 and impellers 513, and the impellers 513 are connected on the rotating shaft 511. In the present embodiment, a plurality of impellers 513 are provided and sequentially connected on the rotating shaft 511 in the axial direction of the rotating shaft 511. Here, the impellers 513 can also be provided as only one. The rotating shaft 511 with the impellers is arranged inside the volute 512 and is in a split structure with the volute 512 and can relatively move. The liquid flow channel 13 is formed between the rotating shaft 511 with the impellers and the volute 512. As shown in Figure 8 A lower connecting column 14 is arranged on the base 2 at the bottom end of the rotating shaft 511, a spherical surface one is arranged on one end of the lower connecting column 14, an upper connecting column 15 is arranged on the bottom end of the rotating shaft 511, a spherical surface two is arranged on one end of the upper connecting column 15, a spherical body 16 is arranged between the spherical surface one and the spherical surface two, the spherical surface one is in fit contact with one end of the spherical body 16, the spherical surface two is in fit contact with the other end of the spherical body 16 opposite to the one end, and the lower connecting column 14, the spherical body 16 and the upper connecting column 15 form a universal joint mechanism, so that the bottom end of the rotating shaft 511 is connected with the base 2 through the universal joint mechanism. In the present embodiment, the fit clearance connection structure between the bottom end of the rotating shaft and the graphite sleeve in the prior art is changed, and the universal joint structure is used to connect the bottom end of the rotating shaft and the base, so that even if the rotating shaft is slightly inclined at an angle due to component machining errors and assembly errors after assembly, the bottom end of the rotating shaft is connected with the base through the universal joint mechanism, so that the rotating shaft is not choked, the normal rotation of the rotating shaft is guaranteed, the normal work of the submersible pump is guaranteed, and the service life of the submersible pump is improved.

[0041] In order to further improve the service life, the lower connecting column 14 and the upper connecting column 15 can be made of graphite material, and the ball 16 can be made of ceramic ball, preferably zirconia ceramic ball. When the rotating shaft rotates, the friction pair formed between the zirconia ceramic ball and the lower connecting column and the upper connecting column made of graphite material realizes self-lubricating effect, thereby improving the service life of the product.

[0042] As shown in Figure 8 and Figure 9 A rotating shaft sleeve 17 is further sleeved on the bottom end of the rotating shaft 511. One end of the rotating shaft sleeve 17 is sleeved on the bottom end of the rotating shaft 511, and the upper connecting column 15 is press-fitted into the other end of the rotating shaft sleeve 17, so that the upper connecting column 15 is connected to the bottom end of the rotating shaft 511. A cover 18 is further provided on the base 2, and the lower connecting column 14 is press-fitted into the cover 18, so that the lower connecting column 14 is connected to the base 2.

[0043] A liquid storage hole one 24 and a liquid storage hole two 19 are respectively arranged on the spherical surface one of the lower connecting column 14 and the spherical surface two of the upper connecting column 15. When the submersible pump works in liquid, part of the liquid will be stored in the liquid storage hole one 24 and the liquid storage hole two 19 with the rotation of the rotating shaft 511. When the submersible pump leaves the liquid and the rotating shaft 511 is still rotating, the liquid stored in the liquid storage hole one 24 and the liquid storage hole two 19 can lubricate the spherical surface one of the lower connecting column 14, the ball 16 and the spherical surface two of the upper connecting column 15, further reducing wear and improving service life. A liquid groove 21 is further arranged on the spherical surface one of the lower connecting column 14 and the spherical surface two 20 of the upper connecting column 15. The liquid groove 21 on the spherical surface one is communicated with the liquid storage hole one 24, and the liquid groove 21 on the spherical surface two is communicated with the liquid storage hole two 19, so that the liquid is more convenient to flow into the liquid storage hole for storage. In this embodiment, the liquid groove 21 is provided with a plurality of liquid grooves.

[0044] As shown in Figure 10As shown, the coupling 6 comprises a cylinder 611, a counterbore one 612 arranged on one end surface of the cylinder 611 and a counterbore two 613 arranged on the other end surface of the cylinder 611, the top end of the rotating shaft 511 is locked in the counterbore two 613 through a connecting member such as a screw 22, so that the rotating shaft 511 and the coupling 6 form an integral structure, an inner spline is arranged on the inner circumferential surface of the counterbore one 612, and an outer 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 counterbore one 612 and forms a spline coupling structure 23 through the cooperation of the inner spline and the outer spline, so as to drivingly connect the motor shaft 411 and the rotating shaft 511. When connected, a normal gap H1 is left between the end surface of one end of the motor shaft 411 and the inner bottom surface of the counterbore one 612, and since the motor shaft 411 and the rotating shaft 511 are coupled by the spline, the rotating shaft 511 with the coupling 6 can move a certain distance relative to the motor shaft 411 in the axial direction through the normal gap H1, but the motor shaft 411 and the rotating shaft 511 cannot rotate relative to each other to ensure the transmission of working torque. In this way, the normal rotation of the rotating shaft can be ensured during work, and the problem of the rotating shaft being blocked can be further avoided, thereby ensuring the normal operation.

[0045] To realize the assembly of the submersible pump with the above structure, the embodiment further discloses an assembly method, which can be referred to Figure 5 , that is, first, the pump head 1 is turned over by 180 degrees and inverted on the ground, then one end of the motor 4 is connected with 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 drivingly connected with the rotating shaft 511 of the impeller volute mechanism 5 through the coupling 6, then the anti-leakage ring 8 is placed on the impeller volute mechanism 5, then the ball 16 is placed on the lower connecting column 14 of the rotating shaft 511, then the pump shell 3 with the base 2 is sleeved on the pump head 1, and the pump shell 3 and the pump body 1 are riveted together, at this time, the motor 4, the impeller volute mechanism 5 and the ball 16 are all located inside the pump shell 3, after assembly, 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 one 612 of the coupling, that is, the normal gap H1 becomes zero, as shown in Figure 11 , at the same time, under the action of gravity, the ball 16 also contacts the spherical surface two of the upper connecting column 15, and the inverted gap H2 appears between the ball 16 and the spherical surface one of the lower connecting column 14; then, the assembled submersible pump is turned over by 180 degrees and placed vertically on the ground, at this time, under the action of gravity, as shown in Figure 10 , the coupling 6 with the rotating shaft 511 moves again relative to the motor shaft 411, so that the normal gap H1 appears between the end surface of one end of the motor shaft 411 and the inner bottom surface of the counterbore one 612 of the coupling, as shown in Figure 8As shown, at the same time, under the action of gravity, one end of the ball 16 also contacts with the second spherical surface of the lower connecting column 14, that is, the inverted gap H2 becomes zero, and the opposite end of the ball 16 also contacts with the first spherical surface of the upper connecting column 15, finally, the bolt 9 is tightened to contact with the leak-proof ring 8, so that the impeller volute mechanism 5 is tightly fixed on the end face of the motor 4 by the leak-proof ring 8, at this time, the assembly of the submersible pump is completed. Through the above-mentioned assembly method, the assembly of the special structure of the submersible pump in the embodiment is realized, the assembly steps are simplified, and the assembly efficiency is improved.

[0046] In summary, the utility model no longer uses the base to tightly fix the impeller volute mechanism, but uses the bolt on the base to tightly fix the impeller volute mechanism, so that the bolt has a long screwing stroke in the axial direction and the screwing stroke can be long or short, therefore, even if there is the influence of the machining error and the assembly error of the parts, the bolt can be used to tightly fix the impeller volute mechanism on the end face of the motor according to the actual assembly position of the impeller volute mechanism. In this way, during assembly, the problem that the impeller volute mechanism is not assembled in place due to the machining error and the assembly error of the parts can be avoided, thereby ensuring the normal work of the submersible pump and improving the assembly quality and the assembly efficiency of the submersible pump. The gap fit connection structure between the bottom end of the rotating shaft and the graphite sleeve in the prior art is modified into the universal joint connection structure, so that even if the rotating shaft is slightly inclined at a certain angle due to the machining error and the assembly error of the parts, the bottom end of the rotating shaft is connected to the base through the universal joint mechanism, so that the rotating shaft is not blocked, the normal rotation of the rotating shaft is ensured, the normal work of the submersible pump is ensured, and the service life of the submersible pump is improved. When the rotating shaft rotates, the friction pair formed between the lower connecting column and the upper connecting column made of the zirconia ceramic ball and graphite realizes the self-lubricating effect, thereby improving the service life of the product. The liquid storage hole one and the liquid storage hole two are arranged on the first spherical surface of the lower connecting column and the second spherical surface of the upper connecting column respectively, when the submersible pump leaves the liquid and the rotating shaft is still rotating, the liquid stored in the liquid storage hole one and the liquid storage hole two can lubricate the first spherical surface of the lower connecting column, the ball and the second spherical surface of the upper connecting column, further reducing wear and improving service life.

[0047] The "multiple" in the embodiment refers to "two or more" in number. The above embodiments are only used to illustrate the utility model, and are not limited to the utility model. Those skilled in the related technical field can make various changes or transformations without departing from the spirit and scope of the utility model, therefore, all equivalent technical solutions should belong to the protection scope of the utility model, and the protection scope of the utility model should be defined by the claims.

Claims

1. An assembly structure for an impeller volute mechanism in a submersible pump, the submersible pump further comprising a pump head located at an upper position; a base located at a lower position; a pump casing disposed between the pump head and the base; a motor; the motor and the impeller volute mechanism are disposed within the pump casing and located between the pump head and the base, the motor shaft of the motor being drivenly connected to the top end of the rotating shaft of the impeller volute mechanism via a coupling, characterized in that: The assembly structure includes a leak-proof ring disposed inside the pump casing and located at the bottom end of the impeller volute mechanism, and a bolt disposed on the base. The bolt passes through the base and contacts the leak-proof ring, thereby using the leak-proof ring to press and fix the impeller volute mechanism to one end face of the motor.

2. The assembly structure according to claim 1, characterized in that: The base and pump housing are an integral structure.

3. The assembly structure according to claim 2, characterized in that: A filter screen is also provided at the bottom of the base.

4. The assembly structure according to claim 3, characterized in that: A sealing ring is also provided between the circumferential surface of the anti-leakage ring and the inner circumferential surface of the pump casing.

5. A submersible pump comprising the assembly structure according to any one of claims 1 to 4, characterized in that: A universal joint mechanism is provided 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.

6. The submersible pump according to claim 5, characterized in that: The universal joint mechanism includes a lower connecting column on the base, an upper connecting column on the bottom of the rotating shaft, and a ball; a spherical surface one is provided on one end of the lower connecting column, a spherical surface two is provided on one end of the upper connecting column, and the ball is located between the spherical surface one and the spherical surface two. The spherical surface one is in contact with one end of the ball, and the spherical surface two is in contact with the other end of the ball.

7. The submersible pump according to claim 6, characterized in that: The lower and upper connecting columns are made of graphite, and the spheres are zirconia ceramic spheres.

8. The submersible pump according to claim 6 or 7, characterized in that: Liquid storage hole one and liquid storage hole two are respectively provided on spherical surface one of the lower connecting column and spherical surface two of the upper connecting column.

9. The submersible pump according to claim 8, characterized in that: Liquid tanks are provided on both the first spherical surface of the lower connecting column and the second spherical surface of the upper connecting column. The liquid tank on the first spherical surface is connected to the first liquid storage hole, and the liquid tank on the second spherical surface is connected to the second liquid storage hole.

10. The submersible pump according to claim 6 or 7, characterized in that: The impeller volute mechanism also includes a volute and an impeller. The impeller is connected to a rotating shaft, and the rotating shaft with the impeller is located inside the volute, and the rotating shaft and the volute are separate structures. The coupling includes a column, a first countersunk hole on one end face of the column, and a second countersunk hole on the other end face of the column. The top end of the rotating shaft is locked in the second countersunk hole by a connector, thereby making the rotating shaft and the coupling an integral structure. An internal spline is provided on the inner circumferential surface of the first countersunk hole, and an external spline is provided on the outer circumferential surface of one end of the motor shaft. One end of the motor shaft is inserted into the first countersunk hole, and the internal spline and the external spline cooperate to form a spline connection structure, thereby connecting the motor shaft and the rotating shaft for transmission. After connection, a positive clearance H1 is left between the end face of one end of the motor shaft and the inner bottom surface of the first countersunk hole.

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