Submersible motor with self-cooling circulation and submersible pump using submersible motor

Abstract

The invention discloses a submersible motor with self-cooling circulation and a submersible pump using the submersible motor, and relates to the technical field of submersible electric pumps, the submersible motor comprises a stator assembly, a rotor assembly and a front cover assembly, and is characterized in that a motor shell is mounted outside the stator assembly and the rotor assembly. According to the invention, the stator iron core and the stator winding are wrapped and protected by the front stator shielding case and the rear stator shielding case, on the basis of the original punching sheet diameter, the length of the iron core can be reduced, the output power can be improved, the original installation size can be ensured, and the increase of the diameter of the submersible motor and the difficulty of the design of a submersible pump flow channel caused by the increase of the punching sheet diameter can be avoided; damage of the bearing is reduced, the submersible motor can be conveniently applied to the submersible pump, the self-cooling effect of the motor and the submersible pump in use is guaranteed through an existing cooling mode, small-space water flow circulation at the two ends can drive local water flow to pass through a sliding bearing gap for lubrication, and meanwhile the sliding bearing is cooled.

Description

Technical Field

[0001] The invention relates to the technical field of submersible electric pumps, in particular to a submersible motor with a self-cooling cycle and a submersible pump using the submersible motor. Background Art

[0002] Submersible motor is a motor specially developed for underwater use. It is directly connected to the pump and runs in water. This motor is matched with various types of submersible pumps, forming an integral part with the pump, and can be submerged in sewage of various water qualities for a long time.

[0003] The submersible motor products currently used in submersible electric pumps require that the motor power be increased while the outer diameter remains unchanged in order to match a set of submersible electric pump impellers and pump bodies with motors of various powers. The stator and rotor of the motor become slender as a whole, resulting in the motor becoming longer and longer, and the stiffness of the shaft becoming worse, which in turn leads to increased radial force and bending moment on the bearings, resulting in bearing damage. In addition, the longer rotor limits the use of existing cooling methods. Summary of the invention

[0004] The object of the present invention is to provide a submersible motor with a self-cooling cycle and a submersible pump using the submersible motor, so as to solve the problem proposed in the above background technology that when the diameter of the punching sheet increases, the diameter of the submersible motor needs to be adjusted accordingly, and the larger motor diameter increases the difficulty of the submersible pump flow channel, thereby reducing the self-cooling effect of the flow channel on the submersible motor when it is used.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a submersible motor with a self-cooling cycle, comprising a stator assembly, a rotor assembly and a front cover assembly, wherein a motor housing is installed outside the stator assembly and the rotor assembly, one end of the motor housing is connected to the front cover assembly by bolts, a mechanical seal is installed on one side of the inner ring surface of the front cover assembly, a front end suction cover is installed between the front cover assembly and the stator assembly, a front sliding bearing assembly is arranged on one side of the front end suction cover, a rear cover assembly is arranged on the other end of the motor housing, a rear end suction cover is installed between the rear cover assembly and the stator assembly, a rear sliding bearing assembly is arranged on one side of the rear end suction cover, and a thrust bearing assembly and a thrust bearing cover are arranged on one side of the rear sliding bearing assembly; The stator assembly includes a stator core, a stator winding and a front stator shielding cover. The stator core is inserted through the stator winding. Epoxy glue is provided at both ends of the stator winding, one side of the epoxy glue is connected to the front stator shielding cover, and one side of the epoxy glue is fixedly connected to the rear stator shielding cover.

[0006] Preferably, the rotor assembly includes a rotor core, rotor bars and a rotating shaft, and rotor end rings and rotor balance rings are respectively installed at both ends of the rotor core. A slot hole is opened on one side of the rotor core, one end of the rotor bar is plugged into the slot hole, and one end of the rotor bar is fixedly connected to the rotor end ring. A rear shaft sleeve and a front shaft sleeve are installed in the rotating shaft through shrink fitting.

[0007] Preferably, the rotating shaft includes an extension end shaft, a front sliding bearing section shaft and a rear sliding bearing section shaft, one end of the extension end shaft is connected to the front sliding bearing section shaft, one end of the front sliding bearing section shaft is fixedly connected to the core section shaft, one end of the core section shaft is fixedly connected to the rear sliding bearing section shaft, the front sliding bearing section shaft, the core section shaft and the rear sliding bearing section shaft are all provided with cavities inside, and the outer annular surfaces of the front sliding bearing section shaft and the rear sliding bearing section shaft are respectively provided with a plurality of water spray holes.

[0008] Preferably, the rear cover assembly includes a rear end cover, an adjustment seat and a rear end cover sealing cover, one end of the rear end cover is connected to the thrust bearing cover by bolts, and the other end of the rear end cover is connected to the rear end cover sealing cover by bolts.

[0009] Preferably, the inner wall of the rear end cover is connected to the adjustment seat via bolts, an adjustment block is installed on one side of the adjustment seat, and the adjustment block is threadedly connected to an adjustment bolt assembly.

[0010] Preferably, the front sliding bearing assembly and the front shaft sleeve constitute a sliding bearing body, and the front sliding bearing assembly includes a front sliding bearing seat, a sliding bearing fixing screw and a front sliding bearing outer ring, and the front sliding bearing outer ring is inserted into the front sliding bearing seat, and the sliding bearing fixing screw and the front sliding bearing outer ring are connected by a thread.

[0011] Preferably, the rear sliding bearing assembly and the rear shaft sleeve constitute a sliding bearing body 2, the rear sliding bearing assembly includes a rear sliding bearing seat, a rear sliding bearing outer ring and a sliding bearing fixing screw, the rear sliding bearing outer ring is inserted into the rear sliding bearing seat, and the rear sliding bearing outer ring and the sliding bearing fixing screw are connected by a thread.

[0012] Preferably, the thrust bearing assembly includes a front thrust bearing friction ring, a rear thrust bearing friction ring and a thrust bearing friction ring screw, the front thrust bearing friction ring is connected to the rear sliding bearing seat through the thrust bearing friction ring screw, and the rear thrust bearing friction ring is connected to the thrust bearing cover through the thrust bearing friction ring screw.

[0013] Preferably, a thrust bearing is arranged between the front thrust bearing friction ring and the rear thrust bearing friction ring.

[0014] A submersible pump with a self-cooling cycle comprises a submersible motor and a water pump. One end of a rotating shaft of the submersible motor is fixedly connected to the water pump.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, the front stator shielding cover and the rear stator shielding cover are installed at both ends of the stator core, and the stator core and the stator winding are wrapped and protected by the front stator shielding cover and the rear stator shielding cover. On the basis of the original punching sheet diameter, the core length can be reduced, the output power can be improved, the original installation size can be guaranteed, and the increase in the punching sheet diameter can be avoided to increase the diameter of the submersible motor, increase the difficulty of the submersible pump flow channel design, reduce the damage to the bearing, make the submersible motor easy to use in the submersible pump, and ensure the self-cooling effect of the motor and the submersible pump when in use through the existing cooling method; 2. In the present invention, the rotating shaft is made of an extension shaft, a front sliding bearing section shaft, an iron core section shaft and a rear sliding bearing section shaft, wherein the front sliding bearing section shaft, the iron core section shaft and the rear sliding bearing section shaft form a multi-section hollow shaft structure, and multiple centrifugal holes can be set to adjust the water flow speed in the air gap cavity on the internal rotor surface to improve the heat dissipation capacity. The water flow circulation in the small spaces at both ends can drive the local water flow to pass through the sliding bearing gap for lubrication, and cool the sliding bearing at the same time; 3. In the present invention, the front end suction hood and the rear end suction hood are respectively installed at the two ends of the stator assembly and the rotor assembly, the front end suction hood is connected to the front cover assembly, and the rear end suction hood is connected to the rear cover assembly, which can be used to reinforce the installation of the front end suction hood and the rear end suction hood. Through the setting of the front end suction hood and the rear end suction hood, the water flow can be guided and isolated, the water flow of the large circulation can be increased, and the internal heat dissipation channel of the motor can be ensured to be smooth. Without the help of an external pressure source, the internal circulation cooling and internal circulation lubrication functions of the circulating pump can be realized synchronously by using the self-power of the submersible motor, and it has the advantages of compact structure and reliable and convenient use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional schematic diagram of a submersible motor with a self-cooling cycle according to the present invention; Figure 2 It is a schematic diagram of the installation structure of the front stator shield cover of a submersible motor with a self-cooling cycle according to the present invention; Figure 3 It is a schematic diagram of the structure of a rotor balancing ring of a submersible motor with a self-cooling cycle according to the present invention; Figure 4 It is a schematic diagram of the installation of the shaft extension end shaft structure of a submersible motor with a self-cooling cycle according to the present invention; Figure 5 It is a schematic diagram of the installation structure of the regulating block of a submersible motor with a self-cooling cycle according to the present invention; Figure 6It is a schematic diagram of the installation structure of the front sliding bearing seat of a submersible motor with a self-cooling cycle according to the present invention; Figure 7 It is a schematic diagram of the installation structure of the outer ring of the rear sliding bearing of a submersible motor with a self-cooling cycle according to the present invention; Figure 8 The present invention is a schematic diagram of the installation structure of a rear thrust bearing friction ring of a submersible motor with a self-cooling cycle.

[0017] In the figure: 1, stator assembly; 1A, stator core; 1B, stator winding; 1C, front stator shield; 1D, rear stator shield; 1F, epoxy glue; 2, rotor assembly; 2A, rotor core; 2B, rotor guide bar; 2C, rotor end ring; 2D, rotor balance ring; 2E, rear shaft sleeve; 2F, rotating shaft; 2F1, shaft extension end shaft; 2F2, front sliding bearing section shaft; 2F3, core section shaft; 2F4, rear sliding bearing section shaft; 2G, front shaft sleeve; 3, front cover assembly; 4, rear cover assembly; 4A, rear end cover; 4B, adjustment block; 4C, adjustment seat; 4D, adjusting bolt assembly; 4F, rear end cover sealing cover; 5, front sliding bearing assembly; 5A, front sliding bearing seat; 5B, sliding bearing set screw; 5C, front sliding bearing outer ring; 6, rear sliding bearing assembly; 6A, rear sliding bearing seat; 6B, rear sliding bearing outer ring; 6C, sliding bearing set screw; 7, thrust bearing assembly; 7A, front thrust bearing friction ring; 7B, thrust bearing; 7C, rear thrust bearing friction ring; 7D, thrust bearing friction ring screw; 8, thrust bearing cover; 9, mechanical seal; 10, front end suction cover; 11, rear end suction cover. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Example 1: Reference Figure 1 - Figure 2As shown: This embodiment provides a submersible motor with a self-cooling cycle, including a stator assembly 1, a rotor assembly 2 and a front cover assembly 3, a motor housing is installed outside the stator assembly 1 and the rotor assembly 2, one end of the motor housing is connected to the front cover assembly 3 by bolts, a mechanical seal 9 is installed on one side of the inner ring surface of the front cover assembly 3, a front end suction cover 10 is installed between the front cover assembly 3 and the stator assembly 1, a front sliding bearing assembly 5 is arranged on one side of the front end suction cover 10, a rear cover assembly 4 is arranged on the other end of the motor housing, and the rear cover assembly 4 and the stator assembly 1 are connected. A rear end suction cover 11 is installed in the middle, a rear sliding bearing assembly 6 is arranged on one side of the rear end suction cover 11, and a thrust bearing assembly 7 and a thrust bearing cover 8 are arranged on one side of the rear sliding bearing assembly 6; the stator assembly 1 includes a stator core 1A, a stator winding 1B and a front stator shielding cover 1C, the stator core 1A is inserted through the stator winding 1B, and epoxy glue 1F is arranged at both ends of the stator winding 1B, one side of the epoxy glue 1F is connected to the front stator shielding cover 1C, and one side of the epoxy glue 1F on the other side is fixedly connected to the rear stator shielding cover 1D.

[0020] In this example, the stator core 1A is inserted into the stator winding 1B, and is initially fixed by shaping and binding. Then, the stator winding 1B at both ends is potted with epoxy glue 1F. After the epoxy glue 1F is potted and cooled and solidified, the front stator shielding cover 1C and the rear stator shielding cover 1D are used to shield and protect the potted stator winding 1B to reduce collision damage to the stator winding 1B. The front end suction cover 10 is used to reinforce the installation of the front stator shielding cover 1C, and the rear end suction cover 11 can be used to reinforce the installation of the rear stator shielding cover 1D. , thereby improving the stability of the front stator shielding cover 1C and the rear stator shielding cover 1D during use; the front sliding bearing assembly 5 and the rear sliding bearing assembly 6 can respectively assist in the installation and use of the front end suction cover 10 and the rear end suction cover 11, thereby improving the stability of the front end suction cover 10 and the rear end suction cover 11 during use; the front cover assembly 3 and the rear cover assembly 4 can be used to seal and protect both ends of the motor housing; the front cover assembly 3 and the rear cover assembly 4 are both penetrated by the rotating shaft 2F, which can reduce the interference of the front cover assembly 3 and the rear cover assembly 4 on the rotation of the rotating shaft 2F.

[0021] Example 2: Reference Figure 1 - Figure 8As shown in the figure, the rotor assembly 2 includes a rotor core 2A, a rotor bar 2B and a rotating shaft 2F. The two ends of the rotor core 2A are respectively installed with a rotor end ring 2C and a rotor balance ring 2D. A slot hole is opened on one side of the rotor core 2A. One end of the rotor bar 2B is plugged into the slot hole. One end of the rotor bar 2B is fixedly connected to the rotor end ring 2C. A rear shaft sleeve 2E and a front shaft sleeve 2G are installed in the rotating shaft 2F through a shrink sleeve. The rotating shaft 2F includes an extension end shaft 2F1, a front sliding bearing section shaft 2F2 and a rear The sliding bearing segment shaft 2F4, one end of the shaft extension end shaft 2F1 is connected to the front sliding bearing segment shaft 2F2, one end of the front sliding bearing segment shaft 2F2 is fixedly connected to the iron core segment shaft 2F3, one end of the iron core segment shaft 2F3 is fixedly connected to the rear sliding bearing segment shaft 2F4, the front sliding bearing segment shaft 2F2, the iron core segment shaft 2F3 and the rear sliding bearing segment shaft 2F4 are all provided with cavities, and the outer ring surfaces of the front sliding bearing segment shaft 2F2 and the rear sliding bearing segment shaft 2F4 are respectively provided with a plurality of water spray holes.

[0022] The rear cover assembly 4 includes a rear end cover 4A, an adjustment seat 4C and a rear end cover sealing cover 4F. One end of the rear end cover 4A is connected to the thrust bearing cover 8 by bolts, and the other end of the rear end cover 4A is connected to the rear end cover sealing cover 4F by bolts. The inner wall of the rear end cover 4A is connected to the adjustment seat 4C by bolts. An adjustment block 4B is installed on one side of the adjustment seat 4C. The adjustment block 4B is connected to the adjustment bolt assembly 4D by thread. The front sliding bearing assembly 5 and the front shaft sleeve 2G form a sliding bearing body 1. The front sliding bearing assembly 5 includes a front sliding bearing seat 5A, a sliding bearing fixing screw 5B and a front sliding bearing outer ring 5C. The front sliding bearing outer ring 5C is inserted in the front sliding bearing seat 5A. The sliding bearing fixing screw 5B and the front sliding bearing outer ring 5C are connected by threads. The rear sliding bearing assembly 6 and the rear shaft sleeve 2E form a sliding bearing body 2, the rear sliding bearing assembly 6 includes a rear sliding bearing seat 6A, a rear sliding bearing outer ring 6B and a sliding bearing set screw 6C, the rear sliding bearing outer ring 6B is inserted in the rear sliding bearing seat 6A, the rear sliding bearing outer ring 6B and the sliding bearing set screw 6C are connected by a thread, the thrust bearing assembly 7 includes a front thrust bearing friction ring 7A, a rear thrust bearing friction ring 7C and a thrust bearing friction ring screw 7D, the front thrust bearing friction ring 7A is connected to the rear sliding bearing seat 6A by the thrust bearing friction ring screw 7D, the rear thrust bearing friction ring 7C is connected to the thrust bearing cover 8 by the thrust bearing friction ring screw 7D, and a thrust bearing 7B is arranged between the front thrust bearing friction ring 7A and the rear thrust bearing friction ring 7C.

[0023] In this embodiment, the rotor guide bar 2B is inserted into the slot of the rotor core 2A and fixed by welding with the rotor end ring 2C, which can reduce the looseness of the rotor guide bar 2B during use. The balance can be achieved by removing materials from the rotor balance ring 2D to ensure the use effect of the rotor balance ring 2D. The rear shaft sleeve 2E and the front shaft sleeve 2G are installed in the rotating shaft 2F by shrink fitting, wherein the shaft extension end shaft 2F1 is a solid structure, the front sliding bearing section shaft 2F2, the core section shaft 2F3, and the rear sliding bearing section shaft 2F4 are hollow structures. When the rotor assembly 2 rotates, the cooling water inside the hollow shaft will be thrown out through the water spray hole due to the centrifugal force, reducing the residual cooling water inside the cavity; The rear cover assembly 4 can adjust the thrust bearing assembly 7. The thrust bearing assembly 7 can be adjusted and the gap and oil film thickness between the thrust bearing assemblies 7 can be controlled by adjusting the bolt assembly 4D and the adjusting seat 4C, and the wear of the thrust bearing assembly 7 caused by rotation can be compensated. 5C is installed in the front sliding bearing seat 5A by cold installation, and is locked and fixed by the sliding bearing set screw 5B to prevent the loosening and displacement of the front sliding bearing outer ring 5C. The front sliding bearing seat 5A has a hole, which can be used as a flow channel for the coolant water inside the motor to achieve cooling and circulation. The rear sliding bearing outer ring 6B is installed in the rear sliding bearing seat 6A by cold installation, and is locked and fixed by the sliding bearing set screw 6C to prevent the loosening and displacement of the rear sliding bearing outer ring 6B. The rear sliding bearing seat 6A has a hole, which can be used as a flow channel for the coolant water inside the motor to achieve cooling and circulation. It is adjusted by adjusting the adjusting seat 4C and the adjusting bolt assembly 4D to maintain the stability of the movement of the thrust bearing 7B, thereby eliminating the safety hazards when the thrust bearing 7B is used.

[0024] Example 3: Reference Figure 1 - Figure 8 As shown: a submersible pump with a self-cooling cycle, the submersible pump comprises a submersible motor and a water pump, one end of the rotating shaft 2F of the submersible motor is fixedly connected to the water pump.

[0025] In this example, by connecting one end of the rotating shaft 2F of the submersible motor to the water pump, the submersible motor can be used as a power source to drive the water pump, thereby forming a submersible pump as a whole.

[0026] The working principle of the present invention is that the interior of the submersible motor is filled with liquid. As the rotor assembly 2 rotates at high speed, the liquid inside the front sleeve 2G can flow into the motor cavity due to the centrifugal force, and flows through the internal gap of the closed motor, thereby forming a stable cooling effect and a sliding bearing lubrication effect. Cooling water circulation process in the motor cavity Figure 1Description: The cavity of the submersible motor with self-cooling circulation is filled with cooling water. When the submersible motor with self-cooling circulation is started, a circulation of cooling water is formed in the motor cavity: two small circulations at both ends and a large circulation at the front and back. When the motor rotates, the rotating shaft 2F rotates. Under the action of centrifugal force, the cooling water in the rotating shaft 2F cavity enters between the rotating shaft 2F and the front sliding bearing assembly 5 through the hole on the front sliding bearing section shaft 2F2, and then enters the motor cavity through the hole on the front sliding bearing seat 5A, and enters the air gap between the stator assembly 1 and the rotor assembly 2 through the front end suction cover 10. Part of the coolant enters through the gap between the front sliding bearing assembly 5 to form lubrication and cooling. The cooling water entering the air gap between the stator assembly 1 and the rotor assembly 2 can enter the rear end of the motor and enter the rear cover assembly 4 of the motor through the hole on the rear sliding bearing seat 6A. The thrust bearing cover 8 is provided with cooling water flow holes. The cooling water at the rear cover assembly 4 flows into the inner cavity of the rotating shaft 2F to form a large circulation between the front and rear ends of the submersible motor with a self-cooling circulation. Part of the cooling water flows into the motor cavity through the hole on the rear sliding bearing section shaft 2F4 to form a circulation at the rear sliding bearing assembly 6 and the thrust bearing assembly 7, and lubricates and dissipates heat for the rear sliding bearing assembly 6 and the thrust bearing assembly 7. When the submersible motor is in use, three circulation intervals can be formed, wherein the two small circulations at the two ends are: the circulation out of the front sliding bearing assembly 5 and the circulation out of the rear sliding bearing assembly 6 and the thrust bearing assembly 7, and the other circulation interval is the circulation of cooling water between the front end and the rear end of the submersible motor, wherein the lubrication and heat dissipation of the front sliding bearing assembly 5, the rear sliding bearing assembly 6 and the thrust bearing assembly 7 can be realized through the small circulations at the two ends; The large circulation at the front and rear ends of the submersible motor can dissipate heat for the rotor bars 2B and the rotor end rings 2C. A closed cavity can be formed between the front cover assembly 3, the rear cover assembly 4, the mechanical seal 9 and the stator assembly 1, the front cover assembly 3, which can assist in the heat dissipation and cooling of the motor.

[0027] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A submersible motor with a self-cooling cycle, comprising a stator assembly (1), a rotor assembly (2) and a front cover assembly (3), characterized in that: The stator assembly (1) and the rotor assembly (2) are externally provided with a motor housing, one end of the motor housing is connected to the front cover assembly (3) by bolts, a mechanical seal (9) is installed on one side of the inner ring surface of the front cover assembly (3), a front end suction cover (10) is installed between the front cover assembly (3) and the stator assembly (1), a front sliding bearing assembly (5) is arranged on one side of the front end suction cover (10), a rear end suction cover (4) is installed between the rear cover assembly (4) and the stator assembly (1), a rear sliding bearing assembly (6) is arranged on one side of the rear end suction cover (11), and a thrust bearing assembly (7) and a thrust bearing cover (8) are arranged on one side of the rear sliding bearing assembly (6); The stator assembly (1) comprises a stator core (1A), a stator winding (1B) and a front stator shielding cover (1C); the stator core (1A) is inserted through the stator winding (1B); epoxy glue (1F) is provided at both ends of the stator winding (1B); one side of the epoxy glue (1F) is connected to the front stator shielding cover (1C); and one side of the epoxy glue (1F) is fixedly connected to the rear stator shielding cover (1D).

2. The submersible motor with self-cooling cycle according to claim 1, characterized in that: The rotor assembly (2) comprises a rotor core (2A), a rotor guide bar (2B) and a rotating shaft (2F); a rotor end ring (2C) and a rotor balance ring (2D) are respectively mounted on two ends of the rotor core (2A); a slot hole is opened on one side of the rotor core (2A); one end of the rotor guide bar (2B) is plugged into the slot hole; one end of the rotor guide bar (2B) is fixedly connected to the rotor end ring (2C); and a rear shaft sleeve (2E) and a front shaft sleeve (2G) are mounted in the rotating shaft (2F) by means of shrink fitting.

3. The submersible motor with self-cooling cycle according to claim 2, characterized in that: The rotating shaft (2F) comprises an extension end shaft (2F1), a front sliding bearing section shaft (2F2) and a rear sliding bearing section shaft (2F4); one end of the extension end shaft (2F1) is connected to the front sliding bearing section shaft (2F2); one end of the front sliding bearing section shaft (2F2) is fixedly connected to an iron core section shaft (2F3); one end of the iron core section shaft (2F3) is fixedly connected to the rear sliding bearing section shaft (2F4); cavities are provided inside the front sliding bearing section shaft (2F2), the iron core section shaft (2F3) and the rear sliding bearing section shaft (2F4); and a plurality of water spray holes are provided on the outer ring surfaces of the front sliding bearing section shaft (2F2) and the rear sliding bearing section shaft (2F4).

4. The submersible motor with self-cooling cycle according to claim 1, characterized in that: The rear cover assembly (4) comprises a rear cover (4A), an adjustment seat (4C) and a rear cover sealing cover (4F); one end of the rear cover (4A) is connected to the thrust bearing cover (8) via bolts, and the other end of the rear cover (4A) is connected to the rear cover sealing cover (4F) via bolts.

5. The submersible motor with self-cooling cycle according to claim 4, characterized in that: The inner wall of the rear end cover (4A) is connected to the adjustment seat (4C) via bolts, an adjustment block (4B) is installed on one side of the adjustment seat (4C), and the adjustment block (4B) is connected to an adjustment bolt assembly (4D) via threads.

6. The submersible motor with self-cooling cycle according to claim 1, characterized in that: The front sliding bearing assembly (5) and the front shaft sleeve (2G) form a sliding bearing body. The front sliding bearing assembly (5) comprises a front sliding bearing seat (5A), a sliding bearing fixing screw (5B) and a front sliding bearing outer ring (5C). The front sliding bearing outer ring (5C) is inserted into the front sliding bearing seat (5A), and the sliding bearing fixing screw (5B) and the front sliding bearing outer ring (5C) are connected by a thread.

7. The submersible motor with self-cooling cycle according to claim 1, characterized in that: The rear sliding bearing assembly (6) and the rear shaft sleeve (2E) form a sliding bearing body 2. The rear sliding bearing assembly (6) comprises a rear sliding bearing seat (6A), a rear sliding bearing outer ring (6B) and a sliding bearing set screw (6C). The rear sliding bearing outer ring (6B) is inserted into the rear sliding bearing seat (6A), and the rear sliding bearing outer ring (6B) and the sliding bearing set screw (6C) are connected by a thread.

8. The submersible motor with self-cooling cycle according to claim 1, characterized in that: The thrust bearing assembly (7) comprises a front thrust bearing friction ring (7A), a rear thrust bearing friction ring (7C) and a thrust bearing friction ring screw (7D); the front thrust bearing friction ring (7A) is connected to the rear sliding bearing seat (6A) via the thrust bearing friction ring screw (7D); and the rear thrust bearing friction ring (7C) is connected to the thrust bearing cover (8) via the thrust bearing friction ring screw (7D).

9. The submersible motor with self-cooling cycle according to claim 8, characterized in that: A thrust bearing (7B) is arranged between the front thrust bearing friction ring (7A) and the rear thrust bearing friction ring (7C).

10. A submersible pump with a self-cooling cycle, characterized in that: A submersible motor with a self-cooling cycle as claimed in any one of claims 1 to 9 is used, wherein the submersible pump comprises a submersible motor and a water pump, and one end of a rotating shaft (2F) of the submersible motor is fixedly connected to the water pump.

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