Submersible motor with internal and external pressure self-adjusting balance

Abstract

The utility model belongs to the technical field of water-filled and oil-filled submerged motors, and particularly relates to a submerged motor with internal and external pressure self-adjusting balance. Internal and external pressure self-balance is achieved through the piston cabin and the adjusting boss cover. A connecting seat at the upper end of the motor shell is provided with a sealing structure, a piston is arranged in a piston cabin in a base at the lower end, the diameter of a threaded through hole of an adjusting boss cover is 0.05-0.2 times that of the piston cabin, and pressure is adjusted by matching with a second hexagonal plug screw. The external wiring port is provided with a sealing member, thereby improving waterproofness. The design can dynamically balance water pressure, avoids sealing failure, is suitable for underwater environment, and is compact in structure and high in reliability.

Description

Technical Field

[0001] This utility model belongs to the technical field of water-filled and oil-filled submersible motors, specifically relating to a submersible motor with self-regulating balance of internal and external pressure. Background Technology

[0002] Driven by the need to improve the efficiency and heat dissipation of submersible motors, water-filled or oil-filled submersible motors have emerged through continuous technological innovation. However, experiments have revealed that the internal pressure differs between rated operation and shutdown states due to temperature variations. During motor operation, heat generated by losses causes the internal medium to expand. Without a pressure balancing mechanism, the internal pressure rises sharply, posing a risk of deformation, bending, or even bursting of structural components such as the stator; or causing the motor's seals to fail, allowing corrosive or other impurities from the outside to enter the motor, leading to corrosion of internal parts and wear of bearings. When the motor stops, the internal pressure decreases, and under the pressure of the external medium, the motor casing may be deformed. Therefore, maintaining a balance between the internal and external pressures of the motor is crucial.

[0003] Traditional regulating mechanisms rely on the deformation of the regulating chamber to balance the internal and external pressures of the motor. However, the regulating chamber is made of rubber, which is susceptible to corrosion and aging in environments with corrosive liquids and large temperature variations. Furthermore, prolonged compression can lead to fatigue failure. In traditional regulating mechanisms, after the motor is filled with cooling medium but before the plug is installed, the regulating chamber, exposed to air, cannot remain free due to the gravity of the internal medium and is compressed downwards. To ensure the regulating chamber remains free before immersion in the normal working medium, a regulating spring mechanism is needed to resist the gravity of the internal medium. This further results in the internal pressure of the motor needing to be balanced by the spring force and the external pressure during normal operation, meaning the internal pressure is greater than the external pressure. Utility Model Content

[0004] To address the aforementioned problems, this invention proposes a submersible motor with self-regulating internal and external pressure balance. This self-regulating balance is achieved by installing a sliding piston assembly within the base. A rubber sealing ring is fitted around the sliding piston inside the piston chamber. When the internal and external pressures of the motor change, the piston slides up and down, altering the chamber's volume. When the internal pressure is greater than the external pressure, the piston moves downwards to discharge fluid; when the external pressure is greater than the internal pressure, the piston moves upwards to draw in fluid. Simultaneously, a mechanical seal is installed within the connecting seat to seal the output shaft. Seals prevent leakage from the base, the connecting seat's water inlet / outlet, and the external wiring port, ensuring that the medium does not leak during pressure regulation.

[0005] The technical solution of this utility model is as follows:

[0006] A submersible motor with self-regulating internal and external pressure balance includes a motor housing, a stator, a rotor, and an output shaft. The motor housing contains basic motor components, the stator, and the rotor. The output shaft is rotatably connected to the motor housing. A connecting seat is fixedly connected to the upper end of the motor housing. The connecting seat is hollow and has a water inlet that extends laterally through the connecting seat. The water inlet has an internal thread and is threadedly connected to a first hexagonal plug. The output shaft passes through the connecting seat, which has a sealing structure that seals the output shaft. A base is fixedly connected to the lower end of the motor housing. The base is hollow and has openings at both ends. A piston chamber is located within the base, and a piston is slidably mounted within the piston chamber. The base has a drain outlet that extends laterally through the base. The drain outlet has an internal thread and is threadedly connected to a second hexagonal plug.

[0007] An adjusting boss cover is fixedly connected to the lower end of the base. A limit bolt is threaded onto the adjusting boss cover, and the screw head of the limit bolt faces the piston direction.

[0008] Preferably, the connector has a hollow interior with openings at the top and bottom. An organic seal is fixedly installed in the opening at the top of the connector. The organic seal has a through-hole, through which the output shaft passes. There is a gap between the output shaft and the through-hole of the organic seal, and a mechanical seal is provided in the gap between the output shaft and the through-hole of the organic seal.

[0009] Preferably, an upper guide bearing assembly and a lower guide bearing assembly are respectively provided on the upper and lower sides of the inner wall of the motor housing, and both the guide bearing assembly and the lower guide bearing assembly are rotatably connected to the output shaft.

[0010] Preferably, the piston has a hollow cavity at the bottom with an opening, and the piston is fitted with several rubber sealing rings that are tightly attached to the inner wall of the piston chamber.

[0011] Preferably, the drain outlet is located above the piston chamber.

[0012] Preferably, the piston chamber is located inside the base and close to the lower end face of the base.

[0013] Preferably, the adjusting boss cover has a threaded through hole in the middle part, the threaded through hole of the adjusting boss cover is connected to the limiting bolt, and the diameter of the threaded through hole is 0.05 to 0.2 times that of the piston compartment.

[0014] Preferably, the motor base component includes an external motor wiring harness, one end of which is located inside the motor housing, and the other end of which extends out from the connector.

[0015] Preferably, the upper end of the connector is provided with an external wiring port, the external wiring of the motor extends from the external wiring port, a gap is provided between the inner wall of the external wiring port and the surface of the external wiring of the motor, and a sealing element is provided in the gap between the external wiring port and the external wiring of the motor.

[0016] The beneficial effects of this utility model are as follows:

[0017] 1. The internal and external pressure self-regulating balance structure is simple, easy to install, and convenient to maintain. The piston structure ensures that changes in the internal and external pressure difference of the motor always maintain a linear up-and-down motion, and the motion path is predictable.

[0018] 2. The pressure regulating mechanism is sealed with multiple rubber sealing rings, which not only achieves a reliable sealing effect, but also meets the requirements of convenient installation and replacement, and is inexpensive.

[0019] 3. Before the motor is filled with cooling medium, the piston is pushed into the piston chamber of the base by the limit screw, at which time the piston assembly reaches the highest position. After the cooling medium is filled, the drain port is plugged and the limit screw is unscrewed. Under the action of atmospheric pressure, the medium inside the motor will not cause the piston assembly to move downward. When the whole machine is placed in the working medium, the internal and external pressures of the motor are equal.

[0020] 4. After the working medium is placed in the motor, under the action of the piston assembly, the inner cavity of the motor is only subjected to the pressure of the medium outside the motor, eliminating the situation where the internal pressure of the motor is greater than the external pressure due to other forces that may be introduced by other structures.

[0021] 5. When the motor is working normally, the motor losses will be converted into heat, which will increase the temperature and pressure of the internal medium. At this time, the piston assembly moves downward to release the pressure, so that the internal and external pressures of the motor can be balanced again.

[0022] 6. A piston is a cylindrical part with a cap at one end, forming an internal cavity, which can reduce the weight of the whole machine; secondly, there are multiple rubber sealing ring grooves on its outer circle, which cooperate with the piston cavity of the base under the action of the rubber sealing rings to form a piston with a sealing effect.

[0023] 7. The adjusting boss cover is assembled on the base, does not require sealing, and is in the shape of a boss. See details. Figure 6 The boss can limit the range of piston movement and, when the piston moves downward, it fits onto the adjusting boss cover, shortening the axial length of the motor.

[0024] 8. The adjusting boss cover has an adjusting threaded hole in the middle. This threaded hole has three functions: First, before the motor is filled with cooling medium, a limiter screwed onto the adjusting threaded hole prevents the piston assembly from moving downwards under the gravity of the internal medium after the motor is filled with cooling medium. Second, when the motor is running, if the internal and external pressures change, the external medium can enter or exit the piston cavity through the adjusting threaded hole when the piston assembly moves, eliminating the need for an additional flow passage. Third, the adjusting threaded hole diameter is not particularly large, which helps to prevent the piston assembly from moving too fast when the external medium pressure changes greatly in a short time, ensuring the sealing effect of the rubber seal and extending the service life of the motor.

[0025] 9. Under the action of the internal and external pressure self-adjusting balance structure, the internal and external pressures of the motor are always balanced, so that the mechanical seal will not be subjected to negative pressure, eliminating the risk of external medium entering the motor and damaging related components. Attached Figure Description

[0026] Figure 1 This is a full sectional view of a submersible motor with self-regulating balance of internal and external pressure.

[0027] Figure 2 This is a three-dimensional cross-sectional view of a submersible motor with self-regulating balance of internal and external pressure.

[0028] Figure 3 This refers to the existing internal and external pressure adjustment structure for motors.

[0029] Figure 4 This is a diagram of the self-regulating and balancing structure of the internal and external pressures of this utility model.

[0030] Figure 5 This is a three-dimensional cross-sectional view of the piston.

[0031] Figure 6 3D cross-sectional view of the adjustable boss cover.

[0032] In the diagram: 1. Adjusting boss cover; 2. Limit bolt; 3. Rubber sealing ring; 4. Piston; 5. Mechanical seal; 6. Mechanical seal seat; 7. Connecting seat; 8. Upper guide bearing assembly; 9. Stator; 10. Rotor; 11. Lower guide bearing assembly; 12. Base; 13. Second hexagonal screw plug; 14. Adjusting bladder; 15. Adjusting cap; 16. Compression spring; 17. Sealing cover; 18. Cover plate; 19. Output shaft; 20. Motor housing; 21. External wiring; 22. Piston chamber; 23. Drain port; 24. External wiring port; 25. Seal; 26. First hexagonal screw plug; 27. Water inlet. Detailed Implementation

[0033] A submersible motor with self-regulating internal and external pressure balance includes a motor housing 20, a stator 9, a rotor 10, and an output shaft 19. The motor housing 20 contains the motor base components, the stator 9, and the rotor 10. The output shaft 19 is rotatably connected to the motor housing 20. A connecting seat 7 is fixedly connected to the upper end of the motor housing 20. The connecting seat 7 is a cavity and has a water inlet 27 that extends laterally through it. The water inlet 27 has an internal thread and is threadedly connected to a first hexagonal plug 26. The output shaft 19 passes through the connecting seat 27. The connecting seat 7 has a sealing structure inside, which can seal the output shaft 19; the lower end of the motor housing 20 is fixedly connected to the base 12, the base 12 is hollow inside and has openings at the upper and lower ends, the base 12 has a piston chamber 22 inside, the piston 4 is slidably installed in the piston chamber 22, the base 12 has a drain port 23, the drain port 23 is transversely penetrating the base 12, the drain port 23 has an internal thread, and the drain port 23 is threadedly connected to a second hexagonal plug 13; the lower end of the base 12 is fixedly connected to the adjusting boss cover 1, the adjusting boss cover 1 is threadedly connected to the limit bolt 2, and the screw head of the limit bolt 2 faces the piston 4.

[0034] The connector 7 has a hollow cavity with openings at the top and bottom. A mechanical seal 6 is fixedly installed in the opening at the top of the connector 7. The mechanical seal 6 has a through-hole. The output shaft 19 passes through the through-hole of the mechanical seal 6. There is a gap between the output shaft 19 and the through-hole of the mechanical seal 6. A mechanical seal 5 is installed in the gap between the output shaft 19 and the through-hole of the mechanical seal 6.

[0035] The upper guide bearing assembly 8 and the lower guide bearing assembly 11 are respectively provided on the upper and lower sides of the inner wall of the motor housing 20. Both the guide bearing assembly 8 and the lower guide bearing assembly 11 are rotatably connected to the output shaft 19.

[0036] The piston 4 has a hollow cavity at the bottom and an opening at the bottom. The piston 4 is fitted with several rubber sealing rings 3, which are tightly attached to the inner wall of the piston chamber 22.

[0037] The drain outlet 23 is located above the piston compartment 22.

[0038] The piston compartment 22 is located inside the base 12 and close to the lower end face of the base 12.

[0039] The adjusting boss cover 1 has a threaded through hole in the middle part. The threaded through hole of the adjusting boss cover 1 is connected to the limiting bolt 2. The diameter of the threaded through hole is 0.05 to 0.2 times that of the piston compartment 22.

[0040] The motor base components include an external motor wiring 21, one end of which is located inside the motor housing 20, and the other end of which extends out from the connector 7.

[0041] The upper end of the connector 7 is provided with an external wiring port 24, and the external wiring 21 of the motor extends out from the external wiring port 24. There is a gap between the inner wall of the external wiring port 24 and the surface of the external wiring 21 of the motor. A sealing element 25 is provided in the gap between the external wiring port 24 and the external wiring 21 of the motor.

[0042] The embodiments of this utility model are as follows:

[0043] A submersible motor with self-regulating internal and external pressure balance is composed of an adjusting boss cover 1, a limiting bolt 2, a rubber sealing ring 3, a piston 4, a mechanical seal 5, a mechanical seal seat 6, a connecting seat 7, an upper guide bearing assembly 8, a stator 9, a rotor 10, a lower guide bearing assembly 11, a base 12, a second hexagonal screw plug 13, an output shaft 19, a motor housing 20, an external wiring 21, a piston chamber 22, a drain port 23, an external wiring port 24, a seal 25, a second hexagonal screw plug 26, and a water inlet 27.

[0044] Piston 4 is a cylindrical part with a cap at one end, forming an internal cavity to reduce the overall weight of the machine. Both ends of piston 4 have rounded corners, and multiple sealing grooves on the outer circumference. (See attached image.) Figure 5 .

[0045] The upper cavity of the base 12 mainly cooperates with the thrust bearing to bear the weight of the rotor 10 and the axial force generated by the motor load; the lower cavity of the base 12 serves as the piston chamber 22, which together with the piston cover 4 and the rubber sealing ring 3 forms a sealing system.

[0046] The rubber sealing ring 3 is first fitted into the sealing groove on the outer circumference of the piston 4, and then inserted into the base 12. The rubber sealing ring 3 forms a reliable seal under the compression of the piston 4 and the inner cavity of the base 12. The part above the piston 4 is in contact with the internal medium of the motor, and the part below is in contact with the external medium, but there is no contact between the internal and external media.

[0047] The adjusting boss cover 1 is installed at the bottom of the base 12. It is a part with a connecting flange at the bottom and a boss in the middle. The boss has a threaded through hole in the middle that mates with the limit bolt 2. See details... Figure 6 No seal is required between the adjusting boss cover 1 and the base 12.

[0048] The adjusting boss cover 1 restricts the movement range of the piston 4, and when a large movement occurs, the piston 4 is fitted onto the adjusting boss cover 1, effectively shortening the length of the motor.

[0049] The limiting bolt 2 is a part installed on the boss 1 before the motor is filled with cooling medium. Its threaded end face presses against the inner cavity of the piston 4. At this time, the piston 4 is in the highest position. This prevents the piston 4 from falling downward due to the gravity of the water after the motor cavity is filled with cooling medium in an air environment, which would eventually cause the motor to lose its pressure regulation function.

[0050] Before filling the motor with cooling medium, the second hexagonal plug 13 needs to be tightened onto the drain port 23 of the base 12; after filling with cooling medium, the first hexagonal plug 26 needs to be tightened onto the fill port 27 of the connecting seat 17. Then, unscrew the limit bolt 2 so that the adjusting structure is in position. Figure 4 Under atmospheric pressure and with the sealing effect of the rubber sealing ring 3, the piston 4 will not move downward under the gravity of the cooling medium.

[0051] When the motor filled with internal medium is placed in the working environment, the pressure inside and outside the motor is equalized by the action of the rubber sealing ring 3 and the piston 4. When the motor is working normally, due to the existence of motor losses, heat is generated, which raises the temperature and pressure of the internal medium. At this time, the piston 4 moves downward to release the pressure, so that the pressure inside and outside the motor reaches equilibrium again.

[0052] When the internal and external pressures of the motor change, the piston 4 moves up and down through the adjusting threaded hole in the middle of the adjusting boss cover 1. The external medium needs to enter or exit the cavity of the piston 4 through the threaded hole, without the need for an additional flow passage hole.

[0053] The threaded hole diameter in the middle part of the adjusting boss cover 1 is relatively small, so that the piston 4 will not move too fast when the pressure of the external medium changes greatly in a short period of time, thus ensuring the sealing effect of the rubber sealing ring 3 and extending the service life of the motor.

[0054] Thanks to the self-regulating and balancing structure of internal and external pressure, the motor maintains a constant balance between internal and external pressures, preventing the mechanical seal from being subjected to negative pressure and eliminating the risk of external media entering the motor and damaging related components.

Claims

1. A submersible motor with self-regulating internal and external pressure balance, comprising a motor housing (20), a stator (9), a rotor (10), and an output shaft (19), wherein the motor housing (20) contains basic motor components, characterized in that, The motor housing (20) is provided with a stator (9), the stator (9) is provided with a rotor (10), and the rotor (10) is provided with an output shaft (19). The output shaft (19) is rotatably connected to the motor housing (20). The motor housing (20) is fixedly connected to a connecting seat (7) at its upper end. The connecting seat (7) is a cavity. The connecting seat (7) is provided with a water inlet (27). The water inlet (27) passes through the connecting seat (7) laterally. The water inlet (27) is provided with an internal thread. The water inlet (27) is threadedly connected to a first hexagonal plug (26). The output shaft (19) passes through the connecting seat (7). The connecting seat (7) is provided with a sealing structure. The sealing structure of the connecting seat (7) can seal the output shaft (19). The lower end of the motor housing (20) is fixedly connected to a base (12). The base (12) is hollow inside and has openings at the top and bottom. The base (12) has a piston chamber (22) inside. A piston (4) is slidably installed inside the piston chamber (22). The base (12) has a drain port (23) that runs horizontally through the base (12). The drain port (23) has an internal thread and is threaded to a second hexagonal plug (13). The lower end of the base (12) is fixedly connected to an adjusting boss cover (1), and a limit bolt (2) is threadedly connected to the adjusting boss cover (1), with the screw head of the limit bolt (2) facing the piston (4).

2. A submersible motor with self-regulating internal and external pressure balance according to claim 1, characterized in that, The connecting seat (7) has a cavity inside and openings at the top and bottom. A mechanical seal seat (6) is fixedly installed in the opening at the top of the connecting seat (7). The mechanical seal seat (6) has a through-hole. The output shaft (19) passes through the through-hole of the mechanical seal seat (6). There is a gap between the output shaft (19) and the through-hole of the mechanical seal seat (6). A mechanical seal (5) is provided in the gap between the output shaft (19) and the through-hole of the mechanical seal seat (6).

3. A submersible motor with self-adjusting internal and external pressure balance according to claim 1, characterized in that, The upper guide bearing assembly (8) and the lower guide bearing assembly (11) are respectively provided on the upper and lower sides of the inner wall of the motor housing (20). The guide bearing assembly (8) and the lower guide bearing assembly (11) are rotatably connected to the output shaft (19).

4. A submersible motor with self-adjusting internal and external pressure balance according to claim 1, characterized in that, The piston (4) has a cavity at the bottom and an opening at the bottom. The piston (4) is fitted with several rubber sealing rings (3), which are in close contact with the inner wall of the piston chamber (22).

5. A submersible motor with self-regulating internal and external pressure balance according to claim 1, characterized in that, The drain outlet (23) is located above the piston chamber (22).

6. A submersible motor with self-regulating internal and external pressure balance according to claim 1, characterized in that, The piston chamber (22) is located inside the base (12) and close to the lower end face of the base (12).

7. A submersible motor with self-regulating internal and external pressure balance according to claim 1, characterized in that, The adjusting boss cover (1) has a threaded through hole in the middle part. The threaded through hole of the adjusting boss cover (1) is connected to the limiting bolt (2). The diameter of the threaded through hole is 0.05 to 0.2 times that of the piston chamber (22).

8. A submersible motor with self-regulating internal and external pressure balance according to claim 1, characterized in that, The motor base components include an external motor wiring harness (21), one end of which is located inside the motor housing (20), and the other end of which extends out from the connector (7).

9. A submersible motor with self-adjusting internal and external pressure balance according to claim 8, characterized in that, The upper end of the connector (7) is provided with an external wiring port (24), the external wiring of the motor (21) extends out from the external wiring port (24), there is a gap between the inner wall of the external wiring port (24) and the surface of the external wiring of the motor (21), and a sealing element (25) is provided in the gap between the external wiring port (24) and the external wiring of the motor (21).

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