Sealing structure for rotating shaft of deep-sea motor and deep-sea power equipment

Abstract

The application provides a sealing structure for a deep-sea motor rotating shaft and a deep-sea power equipment, relates to the field of deep-sea motors, and solves the problem of poor reliability of the sealing structure of the rotating shaft of the existing deep-sea motor, which cannot meet the long-term operation and standby requirements of the motor in the sea. The structure comprises a sealing shell, a first floating sealing assembly and a second floating sealing assembly, the sealing shell is connected with a motor shell, the first floating sealing assembly and the second floating sealing assembly are arranged on the periphery of the rotating shaft and in the sealing shell, the sealing shell, the first floating sealing assembly, the second floating sealing assembly, the rotating shaft and the motor shell form an insulating oil cavity in communication with the inside of the motor shell, the sealing shell, the second floating sealing assembly and the rotating shaft form a water cavity in communication with the outside, the first floating sealing assembly and the second floating sealing assembly can move along the axis direction of the rotating shaft to change the space of the insulating oil cavity and the water cavity, and the first floating sealing assembly and the second floating sealing assembly can keep abutting during the movement.

Description

Technical Field

[0001] This invention relates to the field of deep-sea motor technology, and in particular to a sealing structure for the rotating shaft of a deep-sea motor and a deep-sea power device. Background Technology

[0002] The ocean is rich in mineral resources, such as oil, natural gas, natural gas hydrates, polymetallic nodules, cobalt-rich massive hydrothermal sulfide deposits, polymetallic mud, and barite. With the increasing depletion of terrestrial resources, the importance of marine resources is becoming increasingly prominent, leading to greater emphasis on the investigation and development of marine mineral resources. Furthermore, as marine development activities become more frequent and in-depth, human activities involving marine oil and gas exploration and extraction, marine surveys, marine engineering, laying and maintenance of offshore pipelines and cables, and mining of marine minerals will inevitably move from shallow to deep seas. Deep-sea equipment has naturally become an essential tool for human activities in the ocean. For hydraulically powered or electrically powered underwater tools, deep-sea motors, as their core components, are widely used.

[0003] Underwater equipment must withstand the external pressures of the water environment at its intended operating depth. If we ignore changes in temperature, salinity, and seawater density due to variations in bulk modulus, the pressure per square centimeter of seawater increases with each meter of depth. Therefore, appropriate types of motors should be selected for different seawater depths to ensure reliable sealing. Thus, seals are crucial components of deep-sea motors, and their performance is paramount. In particular, the dynamic seal of the rotating shaft directly affects the motor's normal operation.

[0004] The principle of rotary dynamic seals for deep-sea motors can be broadly categorized into pressure-bearing rotary dynamic seals and pressure-compensated rotary dynamic seals. The structural principle of a pressure-bearing rotary dynamic seal involves installing a sealing cover at the motor output shaft and adding a sealing ring there. The advantage of this structure is that it can use standard-specification motors and is inexpensive. The disadvantage is that the motor's sealing cover and sealing ring must withstand external water pressure; otherwise, any leakage caused by a poor seal will damage the motor.

[0005] Pressure-compensated rotary dynamic seals, also known as oil-filled compensation seals, are the most common solution. The principle is that the motor's interior is filled with non-conductive insulating oil, making the pressure at both ends of the sealing device essentially equal and the pressure difference minimal. This significantly reduces the difficulty of sealing, thereby improving sealing performance and service life. However, a drawback is that during prolonged motor operation, the motor heats up, causing the internal insulating oil to expand and the internal pressure to exceed the external water pressure, potentially leading to oil leakage. With the development of marine charging technology and the requirements for weapon pre-positioning, some deep-sea motors need to operate or remain idle at sea for years or even longer. Therefore, the method of replenishing with compensating oil is clearly insufficient. Summary of the Invention

[0006] In view of this, in order to solve the technical problem that the sealing structure of the rotating shaft of the deep-sea motor has poor reliability and cannot meet the requirements of long-term operation and standby of the motor at sea, the purpose of this invention is to provide a sealing structure for the rotating shaft of the deep-sea motor and a deep-sea power device.

[0007] To achieve the above objectives, the present invention provides a sealing structure for the rotating shaft of a deep-sea motor, comprising a sealing housing, a first floating sealing assembly, and a second floating sealing assembly. The sealing housing is connected to the housing of the deep-sea motor. The first floating sealing assembly and the second floating sealing assembly are both disposed within the sealing housing and sleeved around the rotating shaft of the deep-sea motor. An insulating oil cavity communicating with the interior of the housing is formed between the sealing housing, the first floating sealing assembly, the second floating sealing assembly, the rotating shaft, and the housing. A water cavity communicating with the outside is formed between the sealing housing, the second floating sealing assembly, and the rotating shaft. The first floating sealing assembly and the second floating sealing assembly are movable along the axial direction of the rotating shaft to change the space of the insulating oil cavity and the water cavity, and the first floating sealing assembly and the second floating sealing assembly maintain a contacting state during movement.

[0008] As a further improvement of the present invention, the first floating sealing assembly includes a first floating sealing ring, a connector, and a first elastic element. The first floating sealing ring and the connector are both sleeved on the periphery of the rotating shaft, and the first floating sealing ring is disposed between the connector and the second floating sealing assembly. The first floating sealing ring can be connected to the rotating shaft through the connector. The rotation of the rotating shaft can drive the first floating sealing ring to rotate through the connector, and the first floating sealing ring can move relative to the connector along the axial direction of the rotating shaft. The first elastic element is disposed between the first floating sealing ring and the connector, and a first contact surface that can abut against the second floating sealing assembly is formed on the surface of the first floating sealing ring away from the connector.

[0009] As a further improvement of the present invention, the connecting member and the rotating shaft form a detachable fixed connection, the connecting member is movably connected to the first floating sealing ring through an anti-rotation connecting shaft, the rotation of the rotating shaft can drive the connecting member to rotate, and the connecting member can drive the first floating sealing ring to rotate through the anti-rotation connecting shaft, the axis of the anti-rotation connecting shaft is parallel to the axis of the rotating shaft.

[0010] As a further improvement of the present invention, the connector is L-shaped and includes a rotating shaft connecting part and an anti-rotation connecting shaft mounting part. The rotating shaft connecting part and the anti-rotation connecting shaft mounting part are integral structures. The anti-rotation connecting shaft mounting part is arranged parallel to the rotating shaft and has a connecting hole for mounting the anti-rotation connecting shaft inside. The rotating shaft connecting part is connected to the rotating shaft by a locking screw. The first elastic element is sleeved on the periphery of the rotating shaft and its two ends abut against the rotating shaft connecting part and the first floating sealing ring, respectively.

[0011] As a further improvement of the present invention, the second floating sealing assembly includes a second floating sealing ring and a second elastic element. The second floating sealing ring is disposed between the rotating shaft and the sealing housing and is in clearance fit with the rotating shaft. The side of the second floating sealing ring has a second contact surface that can abut against the first floating sealing ring. The second elastic element is disposed between the end of the second floating sealing ring away from the first floating sealing ring and the sealing housing. The second elastic element is sleeved on the periphery of the rotating shaft. The sealing housing is movably connected to the second floating sealing ring by an anti-rotation pin, and the axis of the anti-rotation pin is parallel to the axis of the rotating shaft.

[0012] As a further improvement of the present invention, sealing rings are provided between the sealing housing and the machine housing, between the first floating sealing ring and the rotating shaft, and between the second floating sealing ring and the sealing housing.

[0013] As a further improvement of the present invention, the roughness of the first contact surface is greater than that of the second contact surface, and the flatness of both the first contact surface and the second contact surface is less than 0.9 μm.

[0014] A deep-sea power device includes a deep-sea motor and a sealing structure for the rotating shaft of the deep-sea motor, the sealing structure being disposed on the rotating shaft of the deep-sea motor.

[0015] As a further improvement of the present invention, the deep-sea motor includes a housing, a rotating shaft, a motor stator, and a motor rotor. The rotating shaft is located at the center inside the housing. The motor rotor is sleeved on the rotating shaft and the two are connected by an interference fit. The motor stator is located on the outer ring of the motor rotor and a gap is provided between the two. The motor stator is fixed relative to the housing. An oil-filled cavity for accommodating insulating oil is formed between the housing, the motor stator, the motor rotor, and the rotating shaft. The oil-filled cavity is connected to the insulating oil cavity.

[0016] The sealing structure provided by this invention is used to seal the rotating shaft of a deep-sea motor, achieving a floating pressure compensation function. When the external water pressure is high, it pushes the second floating sealing assembly to move along the rotating shaft of the deep-sea motor towards the motor side. Simultaneously, the space of the insulating oil cavity shrinks, increasing the internal liquid pressure. When the internal and external pressures are equal, a dynamic equilibrium is achieved. When the motor operates for a long time, the deep-sea motor heats up, causing the insulating oil inside and in the insulating oil cavity to expand. This expansion increases the internal pressure, pushing the first floating sealing assembly to move outward along the rotating shaft of the deep-sea motor. The space of the insulating oil cavity increases, decreasing the internal liquid pressure. When the internal and external pressures are equal, a dynamic equilibrium is achieved. This sealing structure ensures that the internal and external pressures of the deep-sea motor are equal, which is beneficial for sealing the interior of the deep-sea motor with seawater, thus ensuring a good seal on the rotating shaft of the deep-sea motor. Furthermore, it protects the deep-sea motor from damage caused by seawater pressure. This invention not only has the advantage of being adaptable to working in deep-sea environments but also features a simple structure, reliable performance, and long service life. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1This is a schematic diagram of the structure of the deep-sea power equipment provided in an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the sealing structure for the rotating shaft of a deep-sea motor provided in an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of the deep-sea motor provided in an embodiment of the present invention.

[0021] Reference numerals: 1. Deep-sea motor; 11. Housing; 12. Rotating shaft; 2. Sealing structure; 21. Sealing housing; 22. Connecting piece; 23. First floating sealing ring; 24. Second floating sealing ring; 25. First elastic element; 26. Second elastic element; 27. Sealing ring; 3. Locking screw; 4. Anti-rotation connecting shaft; 5. Anti-rotation pin; 6. Filter structure. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0023] In the description of this invention, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention 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 invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this invention, it should also 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 fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] See Figures 1-3This invention provides a sealing structure 2 for the rotating shaft of a deep-sea motor, including a sealing housing 21, a first floating sealing assembly, and a second floating sealing assembly. The sealing housing 21 is connected to the housing 11 of the deep-sea motor 1. The first and second floating sealing assemblies are both disposed inside the sealing housing 21 and sleeved around the rotating shaft 12 of the deep-sea motor 1. An insulating oil cavity that can communicate with the interior of the housing 11 is formed between the sealing housing 21, the first floating sealing assembly, the second floating sealing assembly, the rotating shaft 12, and the housing 11. A water cavity that can communicate with the outside is formed between the sealing housing 21, the second floating sealing assembly, and the rotating shaft 12. The first and second floating sealing assemblies can move along the axial direction of the rotating shaft 12 to change the space of the insulating oil cavity and the water cavity, and the first and second floating sealing assemblies can maintain a contact state during the movement.

[0026] Specifically, the sealing housing 21 and the deep-sea motor 1 are connected by screws, and a sealing ring 27 is used to seal the contact surface between them. The first floating sealing assembly includes a first floating sealing ring 23, a connecting member 22, and a first elastic element 25. The first floating sealing ring 23 and the connecting member 22 are both sleeved on the periphery of the rotating shaft 12, and the first floating sealing ring 23 is disposed between the connecting member 22 and the second floating sealing assembly. A sealing ring 27 is disposed between the first floating sealing ring 23 and the rotating shaft 12. The first floating sealing ring 23 can be connected to the rotating shaft 12 through the connecting member 22. The rotation of the rotating shaft 12 can drive the first floating sealing ring 23 to rotate through the connecting member 22, and the first floating sealing ring 23 can move relative to the connecting member 22 along the axial direction of the rotating shaft 12. A first elastic element 25 is disposed between the first floating sealing ring 23 and the connecting member 22, and a first contact surface is formed on the surface of the first floating sealing ring 23 away from the connecting member 22, which can abut against the second floating sealing assembly.

[0027] In this embodiment, the connector 22 is movably connected to the first floating sealing ring 23 via the anti-rotation connecting shaft 4. The connector 22 is "L" shaped and includes a connecting part for the rotating shaft 12 and a mounting part for the anti-rotation connecting shaft 4. The connecting part for the rotating shaft 12 and the mounting part for the anti-rotation connecting shaft 4 are integral structures. The mounting part for the anti-rotation connecting shaft 4 is arranged parallel to the rotating shaft 12 and has a connecting hole for mounting the anti-rotation connecting shaft 4 inside. The connecting part for the rotating shaft 12 is fixed to the rotating shaft 12 by locking screws 3. The first elastic element 25 is sleeved on the periphery of the rotating shaft 12 and the two ends of the first elastic element 25 abut against the connecting part for the rotating shaft 12 and the first floating sealing ring 23, respectively.

[0028] The rotation of the rotating shaft 12 drives the connecting member 22 to rotate. One end of the anti-rotation connecting shaft 4 is fixedly installed in the mounting hole on the connecting member 22. The first floating sealing ring 23 has a sliding groove, and the other end of the anti-rotation connecting shaft 4 is installed in the sliding groove. The connecting member 22 can drive the first floating sealing ring 23 to rotate through the anti-rotation connecting shaft 4. The axis of the anti-rotation connecting shaft 4 is parallel to the axis of the rotating shaft 12. That is to say, the first floating sealing ring 23 can rotate with the rotating shaft 12 of the deep-sea motor 1 and can slide in the axial direction of the anti-rotation connecting shaft 4 through the sliding groove.

[0029] The second floating sealing assembly in this embodiment includes a second floating sealing ring 24 and a second elastic element 26. The second floating sealing ring 24 is disposed between the rotating shaft 12 and the sealing housing 21 and is in clearance fit with the rotating shaft 12. A sealing ring 27 is also disposed between the second floating sealing ring 24 and the sealing housing 21. The second floating sealing ring 24 has a second contact surface on its side that can abut against the first floating sealing ring 23. A second elastic element 26 is provided between the end of the second floating sealing ring 24 away from the first floating sealing ring 23 and the sealing housing 21. The second elastic element 26 is sleeved on the periphery of the rotating shaft 12. The sealing housing 21 is movably connected to the second floating sealing ring 24 through the anti-rotation pin 5. The axis of the anti-rotation pin 5 is parallel to the axis of the rotating shaft 12. One end of the anti-rotation pin 5 is threadedly connected to the sealing housing 21. The second floating sealing ring 24 has an assembly hole that mates with the anti-rotation pin 5. The other end of the anti-rotation pin 5 is inserted into the assembly hole on the second floating sealing ring 24 to restrict its rotation and allow the second floating sealing ring 24 to slide only along the axial direction of the anti-rotation pin 5.

[0030] The end faces of the first floating sealing ring 23 and the second floating sealing ring 24 are in close contact (the first contact surface and the second contact surface are in close contact), which is a sliding friction fit. As an optional implementation of this embodiment, the roughness of the first contact surface is greater than the roughness of the second contact surface. Specifically, in this embodiment, the roughness of the first contact surface on the first floating sealing ring 23 is less than 0.2 μm, and the roughness of the second contact surface on the second floating sealing ring 24 is less than 0.1 μm; and the flatness of both the first and second contact surfaces is less than 0.9 μm.

[0031] The function of the first elastic element 25 and the second elastic element 26 is to ensure that the first contact surface and the second contact surface are tightly joined when the deep-sea motor 1 is running or when there are pressure fluctuations between the insulating oil and the external water. At the same time, it can also ensure that the first floating sealing ring 23 and the second floating sealing ring 24 can still fit tightly and ensure the sealing effect even if they wear during operation.

[0032] In addition, in this embodiment, a filter structure 6 is provided between the end of the sealed housing 21 away from the deep-sea motor 1 and the rotating shaft 12 of the deep-sea motor 1, and it is made of a hydrophilic material.

[0033] In addition, the present invention also provides a deep-sea power device, including a deep-sea motor 1 and the aforementioned sealing structure 2 for the rotating shaft 12 of the deep-sea motor 1, the sealing structure 2 being disposed on the rotating shaft 12 of the deep-sea motor 1.

[0034] The deep-sea motor 1 in this embodiment includes a housing 11, a rotating shaft 12, a motor stator, and a motor rotor. The rotating shaft 12 is located at the center inside the housing 11. The motor rotor is sleeved on the rotating shaft 12 and the two are connected by an interference fit. The motor stator is located on the outer ring of the motor rotor and there is a gap between the two. The motor stator is fixed relative to the housing 11. An oil-filled cavity for accommodating insulating oil is formed between the housing 11, the motor stator, the motor rotor, and the rotating shaft 12. The oil-filled cavity is connected to the insulating oil cavity.

[0035] The deep-sea power equipment provided by this invention can realize the floating pressure compensation function, which is mainly used to deal with the following two situations:

[0036] (1) Under different water depths (i.e. different water pressures), pressure compensation can ensure in real time and dynamically that the pressure in the insulating oil cavity, the oil-filled cavity inside the deep-sea motor 1 and the external pressure are equal.

[0037] When the external water pressure is high, it pushes the second floating sealing ring 24 to move along the rotation axis 12 of the deep-sea motor 1 towards the deep-sea motor 1 side. During the movement of the second floating sealing ring 24, it also pushes the first floating sealing ring 23 to move along the rotation axis 12 of the deep-sea motor 1 towards the deep-sea motor 1 side. At this time, the space of the insulating oil cavity shrinks, and the internal liquid pressure increases. When the internal and external pressures are equal, a dynamic balance can be achieved.

[0038] (2) When the motor runs for a long time, the deep-sea motor 1 heats up, causing the insulating oil inside and in the insulating oil cavity to expand due to heat. The floating pressure compensation function can also ensure that the internal and external pressures are equal.

[0039] When the insulating oil in the oil-filled cavity and insulating oil cavity inside the deep-sea motor 1 is heated and expands, its internal pressure increases, which will first push the second floating sealing ring 24 outward along the rotating shaft 12 of the deep-sea motor 1. Figure 1The first floating sealing ring 24 moves to the right. Normally, when the second floating sealing ring 24 moves, a gap will be created between it and the first floating sealing ring 23. However, due to the setting of the first elastic element 25, the first elastic element 25 will push the first floating sealing ring 23 to move to the right to abut against the second floating sealing ring 24. In other words, under the action of the first elastic element 25, the first contact surface and the second contact surface can always maintain abutment. The first floating sealing assembly moves outward along the rotating shaft 12 of the deep-sea motor 1, and the space of the insulating oil cavity will increase, and the liquid pressure inside will decrease. When the internal and external pressures are equal, a dynamic balance can be achieved.

[0040] This sealing structure 2 ensures that the pressure inside and outside the deep-sea motor 1 is equal, which is beneficial for sealing the inside of the deep-sea motor 1 with seawater, thereby guaranteeing the sealing effect on the rotating shaft 12 of the deep-sea motor 1. Furthermore, it protects the deep-sea motor 1 from damage caused by seawater pressure. This invention not only has the advantage of being adaptable to working in deep-sea environments, but also has advantages such as simple structure, reliable performance, and long service life.

[0041] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A sealing structure for the rotating shaft of a deep-sea motor, characterized in that, The system includes a sealing housing, a first floating sealing assembly, and a second floating sealing assembly. The sealing housing is connected to the housing of the deep-sea motor. Both the first and second floating sealing assemblies are disposed within the sealing housing and sleeved around the rotating shaft of the deep-sea motor. An insulating oil cavity that can communicate with the inside of the housing is formed between the sealing shell, the first floating sealing assembly, the second floating sealing assembly, the rotating shaft, and the housing. A water cavity that can communicate with the outside is formed between the sealing shell, the second floating sealing assembly, and the rotating shaft. The first floating sealing assembly and the second floating sealing assembly can move along the axial direction of the rotating shaft to change the space of the insulating oil cavity and the water cavity, and the first floating sealing assembly and the second floating sealing assembly can maintain a contact state during the movement. The first floating sealing assembly includes a first floating sealing ring and a connector. The first floating sealing ring can be connected to the rotating shaft through the connector. The rotation of the rotating shaft can drive the first floating sealing ring to rotate through the connector, and the first floating sealing ring can move relative to the connector along the axial direction of the rotating shaft. The second floating seal assembly includes a second floating seal ring, which is disposed between the rotating shaft and the sealing housing and is in clearance fit with the rotating shaft. The side of the second floating seal ring has a second contact surface that can abut against the first floating seal ring.

2. The sealing structure for the rotating shaft of a deep-sea motor according to claim 1, characterized in that, The first floating sealing assembly further includes a first elastic element. The first floating sealing ring and the connecting member are both sleeved on the periphery of the rotating shaft, and the first floating sealing ring is disposed between the connecting member and the second floating sealing assembly. The first elastic element is disposed between the first floating sealing ring and the connecting member, and a first contact surface that can abut against the second floating sealing assembly is formed on the surface of the first floating sealing ring away from the connecting member.

3. The sealing structure for the rotating shaft of a deep-sea motor according to claim 2, characterized in that, The connector and the rotating shaft form a detachable fixed connection. The connector is movably connected to the first floating sealing ring through an anti-rotation connecting shaft. The rotation of the rotating shaft can drive the connector to rotate, and the connector can drive the first floating sealing ring to rotate through the anti-rotation connecting shaft. The axis of the anti-rotation connecting shaft is parallel to the axis of the rotating shaft.

4. The sealing structure for the rotating shaft of a deep-sea motor according to claim 2, characterized in that, The connector is L-shaped and includes a rotating shaft connecting part and an anti-rotation connecting shaft mounting part. The rotating shaft connecting part and the anti-rotation connecting shaft mounting part are integral structures. The anti-rotation connecting shaft mounting part is arranged parallel to the rotating shaft and has a connecting hole for mounting the anti-rotation connecting shaft inside. The rotating shaft connecting part is connected to the rotating shaft by a locking screw. The first elastic element is sleeved on the periphery of the rotating shaft and its two ends abut against the rotating shaft connecting part and the first floating sealing ring, respectively.

5. The sealing structure for the rotating shaft of a deep-sea motor according to claim 2, characterized in that, The second floating seal assembly further includes a second elastic element. The second elastic element is provided between the end of the second floating seal ring away from the first floating seal ring and the sealing housing. The second elastic element is sleeved on the periphery of the rotating shaft. The sealing housing is movably connected to the second floating seal ring through an anti-rotation pin. The axis of the anti-rotation pin is parallel to the axis of the rotating shaft.

6. The sealing structure for the rotating shaft of a deep-sea motor according to claim 5, characterized in that, A sealing ring is provided between the sealing housing and the machine housing, between the first floating sealing ring and the rotating shaft, and between the second floating sealing ring and the sealing housing.

7. The sealing structure for the rotating shaft of a deep-sea motor according to claim 5, characterized in that, The roughness of the first contact surface is greater than that of the second contact surface, and the flatness of both the first and second contact surfaces is less than 0.9 μm.

8. A deep-sea power equipment, characterized in that, The invention includes a deep-sea motor and a sealing structure for the rotating shaft of a deep-sea motor as described in any one of claims 1 to 7, the sealing structure being disposed on the rotating shaft of the deep-sea motor.

9. The deep-sea power equipment according to claim 8, characterized in that, The deep-sea motor includes a housing, a rotating shaft, a motor stator, and a motor rotor. The rotating shaft is located at the center inside the housing. The motor rotor is sleeved on the rotating shaft and the two are connected by an interference fit. The motor stator is located on the outer ring of the motor rotor and a gap is provided between the two. The motor stator is fixed relative to the housing. An oil-filled cavity for accommodating insulating oil is formed between the housing, the motor stator, the motor rotor, and the rotating shaft. The oil-filled cavity is connected to the insulating oil cavity.

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