A permanent magnet submersible motor

Abstract

This utility model discloses a permanent magnet submersible motor, including a housing, a front end seat with a lead wire cover at one end of the housing, and a rear end seat at the other end of the housing. Both the front and rear ends are equipped with injection and discharge assemblies. A stator is fixedly installed inside the housing, and a rotating shaft and several rotors are housed within the stator. The rotors are fixedly mounted on the rotating shaft, with one end of the rotating shaft passing through the front end seat. The support assemblies provide stable support for the rotating shaft, reducing vibration and wear, and improving operational stability and service life. Bearings at both ends of the rotor reduce frictional loss, ensuring smooth rotor rotation and uniform air gap, thus improving operating efficiency. The injection and discharge assemblies on the front and rear ends provide reliable sealing and convenient oil injection and discharge operations. The reinforcing sleeve between the front end seat and the housing enhances the strength and sealing of the joint, providing stronger resistance to deformation and leakage prevention. Quick-connect plugs and detachable front and rear caps simplify the assembly and disassembly process and reduce maintenance costs.

Description

Technical Field

[0001] This utility model belongs to the field of, and in particular relates to a permanent magnet submersible motor. Background Technology

[0002] In the field of oil extraction, submersible motors, as the core equipment driving submersible electric pumps, need to work for a long time in complex downhole environments with high temperature, high pressure, high sediment content, and corrosive media. Their performance stability and service life directly affect the efficiency of oil extraction.

[0003] Existing permanent magnet submersible motors (PMSMs) suffer from several structural design shortcomings: Due to their long length and typically longitudinal operation, traditional shaft support assemblies often rely on single bearings, which are ill-suited to handle the radial and axial loads generated during high-speed shaft rotation. This leads to shaft slippage, increased vibration, and consequently, reduced motor operating accuracy and shortened lifespan of bearings and other components. The oil injection and drainage system is cumbersome to operate, and sealing components are prone to leakage due to pressure variations or wear, failing to ensure adequate oil pressure and lubrication within the motor. Insufficient structural connection strength means that critical joints, such as the front-end seat and the outer casing, are susceptible to deformation due to downhole pressure and motor vibration, resulting in seal failure. Furthermore, the existing motors have complex temperature monitoring and wiring connections, hindering installation and maintenance. The rotor-stator fit is also low, resulting in significant mechanical losses and impacting operating efficiency. These issues severely restrict the reliable application of PMSMs in harsh downhole environments, necessitating urgent structural optimization and improvement.

[0004] Therefore, we need to design a permanent magnet submersible motor to solve these problems. Utility Model Content

[0005] The problem to be solved by this utility model is to provide a permanent magnet submersible motor.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A permanent magnet submersible motor includes a housing, a front end seat at one end of the housing with a lead wire cover, and a rear end seat at the other end of the housing. Both the front end seat and the rear end seat are equipped with injection and discharge assemblies. A stator is fixedly installed inside the housing, and a rotating shaft and several rotors are installed inside the stator. The rotors are fixedly mounted on the rotating shaft. One end of the rotating shaft passes through the front end seat, and a support assembly is mounted on the rotating shaft located outside the front end seat. The support assembly is connected to the front end seat.

[0008] Preferably, the support assembly includes a limiting groove, a thrust bearing, a sliding plate ring, a positioning ring, a split ring, and a retaining groove. The limiting groove is circumferentially formed on the side wall of the rotating shaft. The sliding plate ring is fitted onto the rotating shaft on one side of the limiting groove and is fixedly connected to the rotating shaft. The positioning ring is fitted onto the rotating shaft on the other side of the limiting groove and is fixedly connected to the sliding plate ring. The retaining groove is formed on the inner wall of the positioning ring, which fits against the sliding plate ring, and is aligned with the limiting groove. The inner wall of the split ring fits against the limiting groove, and the outer wall fits against the retaining groove. The thrust bearing is fitted onto the rotating shaft between the sliding plate ring and the front end seat.

[0009] This configuration provides installation space and a positioning base for the split rings via the limiting groove; the thrust bearing effectively restricts the axial movement of the shaft, reducing axial movement during operation and ensuring the smooth operation of the motor; the sliding ring is fixedly connected to the shaft, and the positioning ring is fixed to the sliding ring, with the slot aligned with the limiting groove, so that the inner wall of the split ring fits the limiting groove and the outer wall fits the slot. This structure can transfer the axial force on the shaft to the positioning ring and the sliding ring, and then distribute it to the front end seat, improving the load-bearing capacity of the support components; at the same time, the split ring design facilitates installation and disassembly, reducing maintenance difficulty, and the overall structure can provide stable radial and axial support for the shaft, reducing shaft vibration and wear.

[0010] Preferably, a sliding key is provided on the rotating shaft located on one side of the limiting groove, and the sliding ring is fixedly connected to the rotating shaft through the sliding key.

[0011] With this configuration, a sliding key is installed on the rotating shaft on one side of the limiting groove. The sliding ring is fixedly connected to the rotating shaft through the sliding key. This key connection method ensures that there is no relative rotation between the sliding ring and the rotating shaft, ensuring that the two move synchronously, enhancing the stability of the connection, and avoiding the overall support effect of the support component being affected by the loosening of the sliding ring. At the same time, the key connection structure is simple and easy to process and assemble.

[0012] Preferably, the injection assembly includes fixing holes formed on the front end seat and the rear end seat, an adjusting block is provided on the fixing hole, a connecting hole is provided at one end of the adjusting block, a plug is provided in the connecting hole, and an installation hole is provided at the other end of the adjusting block. The installation hole and the connecting hole are connected through a through hole. A plurality of oil passage holes are provided on the side wall of the installation hole. A baffle is detachably provided at the free end of the installation hole, and a sealing block and a spring are also provided in the installation hole. The sealing block fits and seals against the through hole, and one end of the spring fits against the sealing block and the other end is connected to the baffle.

[0013] This design provides the injection / drainage assembly with excellent functionality and sealing. The fixing hole is used to install the adjusting block, and the plug in the connecting hole seals the connecting hole when no oil injection / drainage is being performed. The mounting hole and connecting hole are connected by a through hole; the sealing block in the mounting hole, under the action of a spring, fits snugly against the through hole, effectively preventing oil leakage from inside the motor. When oil injection / drainage is performed, external pressure pushes the sealing block to compress the spring, opening the through hole, allowing oil to enter and exit through the oil passage, making operation convenient. The baffle is removable, facilitating maintenance and replacement of components such as the sealing block and spring. The overall structure achieves convenient oil injection / drainage and excellent sealing performance, adapting to the working environment of submersible motors.

[0014] Preferably, the sealing block has a spherical structure and its diameter is larger than the diameter of the through hole.

[0015] With this design, the sealing block adopts a spherical structure with a diameter larger than that of the through hole. The spherical structure can better fit the through hole, improving the sealing effect and maintaining good sealing performance even under certain pressure. The larger diameter of the sealing block prevents it from entering the through hole, ensuring that the sealing block can always effectively seal the through hole, further enhancing the sealing reliability of the injection and discharge assembly.

[0016] Preferably, a reinforcing sleeve is fitted at the joint between the front end seat and the outer shell, and the reinforcing sleeve is welded and fixed to the front end seat and the outer shell respectively.

[0017] This design involves fitting a reinforcing sleeve at the joint between the front end and the outer casing, and welding it to both. The reinforcing sleeve enhances the strength and rigidity of the connection between the front end and the outer casing, reduces deformation at the joint caused by motor vibration or external pressure, prevents leakage at the joint, improves the overall structural stability and sealing performance of the motor, and extends the service life of the motor.

[0018] Preferably, the front end seat is provided with a socket hole, and a quick-connect plug is provided in the socket hole. A temperature sensor and a coil winding are respectively connected to the quick-connect plug. The temperature sensor is located in the rear end seat, and the coil winding is fixed on the stator.

[0019] This configuration allows for the installation of quick-connect plugs in the socket holes on the front-end mount. These plugs connect the temperature sensor and the coil windings. The temperature sensor, located in the rear-end mount, can monitor the temperature at the rear of the motor in real time and transmit the data to the control center via the plug. This facilitates timely understanding of the motor's operating status and prevents damage to the motor due to overheating. Simultaneously, the quick-connect plugs also supply power to the coils. Since the coil windings are fixed to the stator, the quick-connect design enables rapid connection, simplifying the wiring process and improving maintenance efficiency.

[0020] Preferably, each of the rotors is provided with a support bearing at both ends, and the rotors are connected to the stator through the support bearings.

[0021] This configuration, by setting support bearings at both ends of several rotors, connects the rotors and stator through the support bearings. The support bearings can reduce the friction between the rotor and the stator when the rotor rotates, reduce energy loss, and at the same time ensure that the rotor rotates stably within the stator, reduce vibration and noise, improve the operating efficiency and stability of the motor, and extend the service life of the components.

[0022] Preferably, a spline sleeve is fixedly provided on the free end of the rotating shaft located outside the front end seat, and a front cap is fitted on the outside of the spline sleeve, the front cap being connected to the front end seat.

[0023] This configuration allows for connection to external devices via a spline sleeve, transmitting torque reliably and withstanding significant loads. A front cap is fitted onto the outer side of the spline sleeve and connected to the front end seat. The front cap protects the spline sleeve and shaft end from external liquids and impurities during transportation, providing sealing and protection to ensure the normal operation of the connection.

[0024] Preferably, a rear cap is detachably provided on the rear end seat.

[0025] With this configuration, a removable rear cap can be installed on the rear end seat. The rear cap can protect the components inside the rear end seat during transportation and prevent external impurities from entering.

[0026] The advantages and positive effects of this utility model are:

[0027] This invention provides stable support for the rotating shaft by setting up support components, reducing vibration and wear, and improving operational stability and service life; the support bearings at both ends of the rotor reduce frictional loss, ensuring smooth rotor rotation and uniform air gap, thus improving operating efficiency; the injection and drainage components on the front and rear seats are reliably sealed, and the oil injection and drainage operations are convenient; the reinforcing sleeve between the front seat and the outer shell improves the strength and sealing of the joint, and has stronger resistance to deformation and leakage prevention; the quick-connect plug and the detachable front and rear caps simplify the disassembly and assembly process and reduce maintenance costs. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1This is a schematic diagram of the internal structure of this utility model;

[0030] Figure 2 This is a schematic diagram of the positioning ring structure of this utility model;

[0031] Figure 3 This is a schematic diagram of the adjusting block structure of this utility model;

[0032] Figure 4 yes Figure 1 Enlarged view of the structure at point A in the image;

[0033] Figure 5 yes Figure 1 Enlarged view of the structure at point B in the image.

[0034] The annotations in the attached figures are explained as follows:

[0035] 1. Stator; 2. Rotor; 3. Shaft; 4. Coil winding; 5. Quick connector; 6. Lead wire cover; 7. Temperature sensor; 8. Rear end seat; 9. Rear cap; 10. Support bearing; 11. Housing; 12. Front end seat; 13. Shaft guard tube; 14. Thrust bearing; 15. Slide key; 16. Slide ring; 17. Split ring; 18. Positioning ring; 19. Insulating tube; 20. Retaining ring; 21. Elastic retaining ring; 22. Spline sleeve; 23. Front cap; 24. Slot; 25. Reinforcing sleeve; 26. Fixing hole; 27. Adjusting block; 28. Baffle; 29. ​​Mounting hole; 30. Oil passage hole; 31. Spring; 32. Sealing block; 33. Plug; 34. Limiting groove; 35. Connecting hole; 36. Socket hole; 37. Through hole; 38. Filler fluid. Detailed Implementation

[0036] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] The present invention will be further described below with reference to the accompanying drawings:

[0039] Example: Figures 1-5 As shown, a permanent magnet submersible motor includes a housing 11. A front end seat 12 is provided at one end of the housing 11, and a lead wire cover 6 is provided on the front end seat 12. A rear end seat 8 is provided at the other end of the housing 11. Both the front end seat 12 and the rear end seat 8 are provided with injection and discharge assemblies. A stator 1 is fixedly installed inside the housing 11. A rotating shaft 3 and several rotors 2 are provided inside the stator 1. The several rotors 2 are fixedly mounted on the rotating shaft 3. One end of the rotating shaft 3 passes through the front end seat 12, and a support assembly is mounted on the rotating shaft 3 located outside the front end seat 12. The support assembly is connected to the front end seat 12.

[0040] The outer casing 11 serves as the basic load-bearing structure of the motor, with its two ends connected to the front end seat 12 and the rear end seat 8, respectively, facilitating connection with other structures. The internal space accommodates core components such as the stator 1 and rotor 2. The injection and drainage assemblies on the front end seat 12 and the rear end seat 8 enable the injection and drainage of oil into the motor and can also be connected to pipes to form a circulation system. The stator 1 is fixed inside the outer casing 11, providing a magnetic field environment for the rotor 2. The rotor 2 is mounted on the shaft 3, and when the rotor 2 is subjected to magnetic force, it drives the shaft 3 to rotate synchronously. After the shaft 3 passes through the front end seat 12, its outer support assembly connects to the front end seat 12, providing stable support for the shaft 3 with the fixing effect of the front end seat 12, ensuring the shaft 3 maintains axial stability during high-speed rotation.

[0041] The support assembly includes a limiting groove 34, a thrust bearing 14, a sliding plate ring 16, a positioning ring 18, a split ring 17, and a retaining groove 24. The limiting groove 34 is circumferentially formed on the side wall of the rotating shaft 3. The sliding plate ring 16 is fitted onto the rotating shaft 3 on one side of the limiting groove 34 and is fixedly connected to the rotating shaft 3. The positioning ring 18 is fitted onto the rotating shaft 3 on the other side of the limiting groove 34 and is fixedly connected to the sliding plate ring 16. The retaining groove 24 is formed on the inner wall of the positioning ring 18, which fits against the sliding plate ring 16, and is aligned with the limiting groove 34. The inner wall of the split ring 17 fits against the limiting groove 34, and the outer wall fits against the retaining groove 24. The thrust bearing 14 is fitted onto the rotating shaft 3 between the sliding plate ring 16 and the front end seat 12.

[0042] The limiting groove 34 facilitates the installation of the split ring 17. After the slide ring 16 is fixed to the rotating shaft 3, the position of the positioning ring 18 is limited by the fixed connection with the positioning ring 18, so that the slot 24 on the inner wall of the positioning ring 18 is precisely aligned with the limiting groove 34. After the split ring 17 is embedded between the two, the radial force of the rotating shaft 3 can be transmitted to the positioning ring 18 and the slide ring 16. The thrust bearing 14 is located between the slide ring 16 and the front end seat 12. On the one hand, it bears the fixed support force of the front end seat 12. On the other hand, it limits the axial displacement of the rotating shaft 3 through its cooperation with the rotating shaft 3. Together with the radial constraint formed by the split ring 17, it achieves all-round stable support for the rotating shaft 3.

[0043] A sliding key 15 is provided on the rotating shaft 3 located on one side of the limiting groove 34, and the sliding ring 16 is fixedly connected to the rotating shaft 3 through the sliding key 15.

[0044] The slide key 15 is embedded in the keyway of the rotating shaft 3 and the keyway of the slide ring 16, eliminating the relative rotational freedom between the slide ring 16 and the rotating shaft 3 through a mechanical interlocking structure. This connection method allows the slide ring 16 to rotate synchronously with the rotating shaft 3 while providing a fixed base point for the positioning ring 18, ensuring that the positioning ring 18, the split ring 17, and other components maintain a stable relative position with the rotating shaft 3, and ensuring a continuous mechanical transmission path for the entire support assembly.

[0045] The injection assembly includes fixing holes 26 on the front end seat 12 and the rear end seat 8. An adjusting block 27 is provided on the fixing hole 26. One end of the adjusting block 27 has a connecting hole 35, and a plug 33 is installed inside the connecting hole 35. The other end of the adjusting block 27 has a mounting hole 29, which is connected to the connecting hole 35 via a through hole 37. Several oil passage holes 30 are provided on the side wall of the mounting hole 29. A baffle 28 is detachably installed at the free end of the mounting hole 29. A sealing block 32 and a spring 31 are also provided inside the mounting hole 29. The sealing block 32 is fitted and sealed against the through hole 37. One end of the spring 31 is fitted against the sealing block 32, and the other end is connected to the baffle 28. Lead gaskets are provided for sealing at the shoulder of the adjusting block 27 and the fixing hole 12, and at the shoulder of the plug 33 and the connecting hole 35.

[0046] The injection and discharge assembly is connected to the front seat 12 and the rear seat 8 through the fixing hole 26. The fixing hole 26 not only provides an installation position for the core components of the injection and discharge assembly, but also communicates with the inside of the motor to facilitate the injection and discharge of the filling fluid 38. The adjusting block 27, as a core functional component, has a connection hole 35 that connects to external injection and discharge equipment. The plug 33 closes the connection hole 35 to maintain a seal when not in operation. The sealing block 32 in the mounting hole 29 is tightly fitted with the through hole 37 under the elastic force of the spring 31, blocking the passage between the connection hole 35 and the oil passage hole 30 and preventing oil leakage. When performing oil injection and discharge operations, external pressure pushes the sealing block 32 to compress the spring 31 through the connection hole 35, making the through hole 37 connect with the mounting hole 29. The oil flows into or out of the motor through the through hole 37 and the mounting hole 29 from the oil passage hole 30. After the operation is completed, the spring 31 resets and pushes the sealing block 32 to reseal the through hole 37. The detachable design of the baffle 28 provides operating space for the maintenance of the sealing block 32 and the spring 31. Lead has a lower hardness and deforms when subjected to external pressure, allowing it to fit more tightly against the contact surface and achieve a seal.

[0047] The sealing block 32 has a spherical structure and its diameter is larger than that of the through hole 37.

[0048] The through-hole 37 has a trumpet-shaped structure, and the curved surface structure of the spherical sealing block 32 can form a line contact seal with the port of the through-hole 37. Compared with the planar seal, it can adapt to the slight deformation of the port of the through-hole 37, thus improving the sealing reliability. Its design, with a diameter larger than that of the through-hole 37, not only prevents the sealing block 32 from being sucked into the through-hole 37 and causing sealing failure, but also ensures that the sealing block 32 always fits the through-hole 37 with a complete spherical surface, forming an effective sealing barrier.

[0049] A reinforcing sleeve 25 is fitted at the joint between the front end seat 12 and the outer shell 11, and the reinforcing sleeve 25 is welded and fixed to the front end seat 12 and the outer shell 11 respectively.

[0050] By installing a reinforcing sleeve 25 at the joint between the front end seat 12 and the outer casing 11, and welding the reinforcing sleeve 25 to both, the stress at the joint is distributed to the entire reinforcing sleeve 25, reducing joint deformation caused by motor vibration or external water pressure. Welding ensures that the reinforcing sleeve 25 forms a rigid whole with the front end seat 12 and the outer casing 11, further improving the sealing performance at the joint and preventing liquid from seeping into the motor.

[0051] The front end seat 12 is provided with a socket hole 36, and a quick connector 5 is provided in the socket hole 36. A temperature sensor 7 and a coil winding 4 are respectively connected to the quick connector 5. The temperature sensor 7 is located in the rear end seat 8, and the coil winding 4 is fixed on the stator 1.

[0052] The socket hole 36 provides installation positioning for the quick-connect plug 5, which acts as an intermediate connector. One end of the quick-connect plug 5 connects to the coil winding 4 on the stator 1 to transmit electrical energy, and the other end connects to the temperature sensor 7 inside the rear seat 8 to transmit temperature signals. This integrated connection method reduces the number of wiring connectors, enables quick installation and removal of the coil winding 4 and the temperature sensor 7 through the quick-connect structure, and protects the connector from external liquid corrosion thanks to the sealing design of the socket hole 36.

[0053] A protective shaft tube 13 is fixedly connected to the front end seat 12. The rotating shaft 3 passes through the protective shaft tube 13. An insulating tube 19 is sleeved on the protective shaft tube 13. An elastic retaining ring 21 is provided at the end of the insulating tube 19. A retaining ring ring 20 is provided on the protective shaft tube 13 to cooperate with the elastic retaining ring 21 to block the insulating tube 19.

[0054] Several rotors 2 are provided with support bearings 10 at both ends, and the rotors 2 and stator 1 are connected through the support bearings 10.

[0055] The inner rings of the support bearings 10 at both ends of the rotor 2 are fixed to the rotor 2, while the outer rings contact the stator 1. This converts the rotation of the rotor 2 inside the stator 1 into rolling friction of the support bearings 10, significantly reducing mechanical losses between the rotor 2 and the stator 1. The support bearings 10 also provide radial positioning for the rotor 2, ensuring a uniform air gap between the rotor 2 and the stator 1, preventing direct contact and frictional wear, and guaranteeing efficient and stable motor operation.

[0056] A spline sleeve 22 is fixedly installed on the free end of the rotating shaft 3 located outside the front seat 12. A front cap 23 is fitted on the outside of the spline sleeve 22 and is connected to the front seat 12. A rear cap 9 is detachably installed on the rear seat 8.

[0057] The spline sleeve 22 at the free end of the shaft 3 is connected to the external load transmission mechanism via a spline connection to achieve torque transmission. The spline structure can withstand large axial and radial forces, ensuring stable power transmission. The front cap 23 and the rear cap 9 can be installed on the front end seat 12 and the rear end seat 8 during transportation to protect the inside of the motor. The front cap 23 is fitted on the outside of the spline sleeve 22 and connected to the front end seat 12, forming a closed space to protect the spline sleeve 22 from external impurities and to prevent the oil inside the motor from leaking from the gap between the shaft 3 and the front end seat 12.

[0058] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A permanent magnet submersible motor, characterized in that: The device includes a housing (11), one end of which is provided with a front end seat (12), and the front end seat (12) is provided with a lead wire cover (6). The other end of the housing (11) is provided with a rear end seat (8), and both the front end seat (12) and the rear end seat (8) are provided with injection assembly. A stator (1) is fixedly provided inside the housing (11), and a rotating shaft (3) and several rotors (2) are provided inside the stator (1). Several rotors (2) are fixedly mounted on the rotating shaft (3). One end of the rotating shaft (3) passes through the front end seat (12), and a support assembly is mounted on the rotating shaft (3) located outside the front end seat (12), and the support assembly is connected to the front end seat (12).

2. The permanent magnet submersible motor according to claim 1, characterized in that: The support assembly includes a limiting groove (34), a thrust bearing (14), a sliding plate ring (16), a positioning ring (18), a split ring (17), and a retaining groove (24). The limiting groove (34) is formed circumferentially around the rotating shaft (3) on the side wall of the rotating shaft (3). The sliding plate ring (16) is fitted onto the rotating shaft (3) on one side of the limiting groove (34) and is fixedly connected to the rotating shaft (3). The positioning ring (18) is fitted onto the other side of the limiting groove (34). The rotating shaft (3) on the side is fixedly connected to the sliding plate ring (16). The slot (24) is opened on the inner wall of the positioning ring (18) that fits with the sliding plate ring (16) and is aligned with the limiting groove (34). The inner wall of the split ring (17) fits with the limiting groove (34) and the outer wall fits with the slot (24). The thrust bearing (14) is mounted on the rotating shaft (3) between the sliding plate ring (16) and the front end seat (12).

3. A permanent magnet submersible motor according to claim 2, characterized in that: A sliding key (15) is provided on the rotating shaft (3) located on one side of the limiting groove (34), and the sliding ring (16) is fixedly connected to the rotating shaft (3) through the sliding key (15).

4. A permanent magnet submersible motor according to claim 1, characterized in that: The injection assembly includes fixing holes (26) on the front end seat (12) and the rear end seat (8). An adjusting block (27) is provided on the fixing hole (26). A connecting hole (35) is provided at one end of the adjusting block (27). A plug (33) is provided in the connecting hole (35). An installation hole (29) is provided at the other end of the adjusting block (27). The installation hole (29) is connected to the connecting hole (35) through a through hole (37). A plurality of oil passage holes (30) are provided on the side wall of the installation hole (29). A baffle (28) is detachably provided at the free end of the installation hole (29). A sealing block (32) and a spring (31) are also provided in the installation hole (29). The sealing block (32) fits and seals with the through hole (37). One end of the spring (31) fits with the sealing block (32), and the other end is connected to the baffle (28).

5. A permanent magnet submersible motor according to claim 4, characterized in that: The sealing block (32) has a spherical structure and its diameter is larger than that of the through hole (37).

6. A permanent magnet submersible motor according to claim 1, characterized in that: A reinforcing sleeve (25) is fitted at the seam between the front end seat (12) and the outer shell (11), and the reinforcing sleeve (25) is welded and fixed to the front end seat (12) and the outer shell (11) respectively.

7. A permanent magnet submersible motor according to claim 1, characterized in that: The front end seat (12) is provided with a socket hole (36), and a quick connector (5) is provided in the socket hole (36). A temperature sensor (7) and a coil winding (4) are respectively connected to the quick connector (5). The temperature sensor (7) is located in the rear end seat (8), and the coil winding (4) is fixed on the stator (1).

8. A permanent magnet submersible motor according to claim 1, characterized in that: Each of the rotors (2) is provided with a support bearing (10) at both ends, and the rotor (2) is connected to the stator (1) through the support bearing (10).

9. A permanent magnet submersible motor according to claim 1, characterized in that: A spline sleeve (22) is fixedly provided on the free end of the rotating shaft (3) located outside the front end seat (12). A front cap (23) is fitted on the outside of the spline sleeve (22), and the front cap (23) is connected to the front end seat (12).

10. A permanent magnet submersible motor according to claim 1, characterized in that: A rear cap (9) is detachably provided on the rear end seat (8).

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