Single floating seal structure and deep sea power equipment

Abstract

The application provides a single floating seal structure and a deep-sea power equipment, and relates to the field of deep-sea motors, and solves the problem of poor sealing reliability of the rotating shaft of the 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 floating seal ring, a static seal ring and a rotating seal ring arranged in the sealing shell, the sealing shell is connected with the shell of the deep-sea motor, the rotating seal ring is fixedly connected with the rotating shaft of the deep-sea motor, the floating seal ring is sleeved in the inner ring of the sealing shell, the static seal ring is arranged between the floating seal ring and the rotating seal ring and can move along the axial direction of the rotating shaft, and the static seal ring and the rotating seal ring always keep the abutting state; a first cavity and a second cavity which are not communicated with each other are formed in the sealing shell, the first cavity is communicated with the inside of the shell of the deep-sea motor, the second cavity is communicated with the outside, and the floating seal ring can move along the axial direction of the rotating shaft to change the space of the first cavity and the second cavity.

Description

Technical Field

[0001] This invention relates to the field of deep-sea motor technology, and in particular to a single floating sealing structure and deep-sea power equipment. Background Technology

[0002] With the deepening of marine development activities, deep-sea motors have been widely used as core components of underwater equipment. Sealing is a critical issue that needs to be addressed when ordinary motors are used in deep-sea applications, especially the dynamic seal of the rotating shaft, the performance of which directly affects whether the motor can operate normally.

[0003] 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.

[0004] The structural principle of pressure-compensated rotary dynamic seals is that the inside of the motor is filled with non-conductive insulating oil, which makes the pressure at both ends of the sealing device basically equal and the sealing pressure difference at both ends is very small. This can greatly reduce the difficulty of sealing, thereby improving the sealing effect and service life. However, the drawback is that when the motor runs for a long time, the motor heats up, which causes the insulating oil inside the motor to expand due to heat. This causes the pressure inside the motor to be greater than the external water pressure, which may cause the insulating oil to leak from the inside.

[0005] This sealing method combines the advantages of both types while avoiding their respective disadvantages, resulting in a more reliable and longer-lasting new sealing method. Summary of the Invention

[0006] In view of this, in order to solve the technical problem that the sealing reliability of the rotating shaft of the deep-sea motor is poor in the existing technology 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 single floating sealing structure and a deep-sea power equipment.

[0007] To achieve the above objectives, the present invention provides a single floating seal structure, including a sealing housing and a floating seal ring, a static seal ring, and a rotating seal ring disposed within the sealing housing. The sealing housing is connected to the housing of a deep-sea motor, and the rotating seal ring is fixedly connected to the rotating shaft of the deep-sea motor. The floating seal ring is sleeved within the inner ring of the sealing housing, and the static seal ring is disposed between the floating seal ring and the rotating seal ring and can move along the axial direction of the rotating shaft, and the static seal ring and the rotating seal ring always remain in contact. The sealing housing forms a first cavity and a second cavity that are not interconnected. The first cavity is connected to the interior of the housing of the deep-sea motor, and the second cavity is connected to the outside. The floating seal ring can move along the axial direction of the rotating shaft to change the space of the first cavity and the second cavity.

[0008] As a further improvement of the present invention, the sealing housing is detachably fixedly connected to the housing of the deep-sea motor through a connector, and the sealing housing and the housing of the deep-sea motor are sealed at their contact surfaces by a sealing ring.

[0009] As a further improvement of the present invention, the rotary sealing ring is fixedly connected to the rotary shaft by a set screw, and the rotary sealing ring and the rotary shaft are sealed together by a sealing ring.

[0010] As a further improvement of the present invention, the floating sealing ring is sealed to the inner wall surface of the sealing housing through a sealing ring.

[0011] As a further improvement of the present invention, a preload spring is installed between the end of the floating sealing ring away from the deep-sea motor and the sealing housing.

[0012] As a further improvement of the present invention, the static sealing ring is sleeved inside the floating sealing ring, and the static sealing ring and the floating sealing ring are sealed by a sealing ring, and the static sealing ring is connected to the sealing housing by an anti-rotation pin.

[0013] As a further improvement of the present invention, a wave spring is installed between the end of the static sealing ring near the deep-sea motor and the housing of the deep-sea motor. The wave spring is in a compressed state, and under the force of the wave spring, the static sealing ring can be tightly attached to the rotating sealing ring.

[0014] As a further improvement of the present invention, the static sealing ring includes a first connecting part and a second connecting part, the first connecting part and the second connecting part are integral structures, the first connecting part is sealed to the floating sealing ring, the wave spring is installed between the second connecting part and the housing of the deep-sea motor, and a contact surface is formed on the second connecting part that can abut against the rotating sealing ring.

[0015] As a further improvement of the present invention, a filter felt is provided between the sealed housing and the rotating shaft of the deep-sea motor.

[0016] The present invention also provides a deep-sea power device, including a deep-sea motor and the single floating seal structure, wherein the single floating seal structure is disposed on the rotating shaft of the deep-sea motor;

[0017] 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 them. 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 first cavity.

[0018] The single floating seal 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 floating seal ring to move along the rotating shaft of the deep-sea motor towards the motor side. Simultaneously, the space of the first 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 first cavity to expand. This expansion increases the internal pressure, pushing the floating seal ring to move outward along the rotating shaft of the deep-sea motor. The space of the first 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. 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

[0019] 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.

[0020] Figure 1 This is a schematic diagram of the internal structure of the deep-sea power equipment provided in an embodiment of the present invention;

[0021] Figure 2 This is another internal structural schematic diagram of the deep-sea power equipment provided in this embodiment of the invention;

[0022] Figure 3 This is a schematic diagram of the overall structure of the deep-sea motor provided in an embodiment of the present invention.

[0023] Reference numerals: 1. Deep-sea motor; 11. Housing; 12. Rotating shaft; 2. Single floating seal structure; 20. Sealing housing; 21. Floating sealing ring; 22. Static sealing ring; 23. Rotating sealing ring; 24. Anti-rotation pin; 25. Set screw; 26. Wave spring; 27. Preload spring; 28. Sealing ring; 29. ​​Filter felt; 3. First chamber; 4. Second chamber; 5. Dynamic sealing surface; 6. Oil filling chamber. Detailed Implementation

[0024] 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.

[0025] 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.

[0026] 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.

[0027] See Figures 1-3 This invention provides a single floating sealing structure 2, including a sealing housing 20 and a floating sealing ring 21, a static sealing ring 22, and a rotating sealing ring 23 disposed within the sealing housing 20. The sealing housing 20 is connected to the housing 11 of a deep-sea motor 1, and the rotating sealing ring 23 is fixedly connected to the rotating shaft 12 of the deep-sea motor 1. The floating sealing ring 21 is sleeved in the inner ring of the sealing housing 20, and the static sealing ring 22 is disposed between the floating sealing ring 21 and the rotating sealing ring 23 and can move along the axial direction of the rotating shaft 12, and the static sealing ring 22 and the rotating sealing ring 23 always remain in contact. The sealing housing 20 forms a first cavity 3 and a second cavity 4 that are not interconnected. The first cavity 3 is connected to the interior of the housing 11 of the deep-sea motor 1 and is filled with insulating oil. The second cavity 4 is connected to the outside environment, and the medium in the second cavity 4 is the same as the external environment. During operation, the second cavity 4 is filled with water, and the insulating oil and water are immiscible. The floating sealing ring 21 can move along the axial direction of the rotating shaft 12 to change the space of the first cavity 3 and the second cavity 4.

[0028] The single floating seal structure 2 is mounted on the motor output shaft. Its sealing housing 20 is detachably fixedly connected to the housing 11 of the deep-sea motor 1 through a connector (such as a bolt). The sealing housing 20 and the housing 11 of the deep-sea motor 1 are sealed at the contact surface of the two by a sealing ring 28.

[0029] The rotating sealing ring 23 is fixedly connected to the rotating shaft 12 by the set screw 25, so that it can only rotate with the rotating shaft 12 of the deep-sea motor 1 and cannot move axially. At the same time, the rotating sealing ring 23 and the rotating shaft 12 are sealed together by the sealing ring 28.

[0030] In this embodiment, the floating sealing ring 21 is fitted inside the sealing housing 20 and is sealed to the inner wall of the sealing housing 20 via the sealing ring 28. The floating sealing ring 21 can only slide axially along the rotation axis 12 of the deep-sea motor 1 and cannot rotate. A preload spring 27 is installed between the end of the floating sealing ring 21 away from the deep-sea motor 1 and the sealing housing 20.

[0031] The static sealing ring 22 is fitted inside the floating sealing ring 21, and the static sealing ring 22 and the floating sealing ring 21 are sealed by a sealing ring 28. The static sealing ring 22 is connected to the sealing housing 20 by an anti-rotation pin 24, so that the static sealing ring 22 cannot rotate and can only move in the axial direction of the rotating shaft 12.

[0032] Meanwhile, a wave spring 26 is installed between the end of the static sealing ring 22 near the deep-sea motor 1 and the housing 11 of the deep-sea motor 1, and is in a compressed state. Under the force of the wave spring 26, the static sealing ring 22 can be tightly attached to the rotating sealing ring 23.

[0033] Specifically, in this embodiment, the static sealing ring 22 includes a first connecting part and a second connecting part, which are integrally formed. The first connecting part is sealed to the floating sealing ring 21, and a wave spring 26 is installed between the second connecting part and the housing 11 of the deep-sea motor 1. A contact surface is formed on the second connecting part that can abut against the rotating sealing ring 23. This contact surface is the dynamic sealing surface 5.

[0034] As an optional embodiment of the present invention, a filter felt 29 is provided between the sealed housing 20 and the rotating shaft 12 of the deep-sea motor 1.

[0035] In addition, the present invention also provides a deep-sea power device, including a deep-sea motor 1 and the above-mentioned single floating seal structure 2, wherein the single floating seal structure 2 is disposed on the rotating shaft 12 of the deep-sea motor 1.

[0036] 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 6 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 6 is connected to the first cavity 3.

[0037] The first chamber 3 and the second chamber 4 are isolated and sealed by the sealing ring 28 and the dynamic sealing surface 5, ensuring that the external medium (water) cannot enter the first chamber 3 and the motor.

[0038] The function of the wave spring 26 is to keep the static sealing ring 22 in close contact with the rotating sealing ring 23. Even during the long-term operation of the deep-sea motor 1, the contact surface (dynamic sealing surface 5) on the static sealing ring 22 that abuts against the rotating sealing ring 23 will experience a certain degree of frictional wear. Under the action of the wave spring 26, it can always be in close contact, which plays a role in wear compensation and ensures the sealing effect.

[0039] The function of the preload spring 27 is to ensure that when the pressure in the first chamber 3 and the second chamber 4 fluctuates, the axial position of the floating sealing ring 21 can be adjusted in real time according to the pressure difference to achieve the balance of internal and external pressure.

[0040] 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:

[0041] (1) Under different water depths (i.e. different water pressures), pressure compensation can dynamically ensure in real time that the pressure of the first cavity 3, the oil-filled cavity 6 inside the deep-sea motor 1 and the external pressure are equal.

[0042] When the external water pressure is high, it pushes the floating sealing ring 21 to move along the rotation axis 12 of the deep-sea motor 1 towards the deep-sea motor 1 side. At the same time, the space of the first cavity 3 shrinks, and the internal liquid pressure increases. When the internal and external pressures are equal, a dynamic balance can be achieved.

[0043] (2) When the motor runs for a long time, the deep-sea motor 1 heats up, causing the insulating oil inside and in the first cavity 3 to expand due to heat. The floating pressure compensation function can also ensure that the internal and external pressures are equal.

[0044] When the insulating oil inside the deep-sea motor 1 and the first cavity 3 is heated and expands, the liquid pressure increases, which will push the floating sealing ring 21 to move outward along the rotating shaft 12 of the deep-sea motor 1. The space of the first cavity 3 increases, and the liquid pressure inside it decreases. When the internal and external pressures are equal, a dynamic balance can be achieved.

[0045] The floating pressure compensation function ensures that the internal and external pressures of the deep-sea motor 1 are equal, thus guaranteeing the service life and sealing effect of the sealing ring 28. It also allows the motor to dynamically adapt to the sealing requirements of different water depths.

[0046] 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 single floating sealing structure, characterized in that, The device includes a sealing housing and a floating sealing ring, a static sealing ring, and a rotating sealing ring disposed within the sealing housing. The sealing housing is connected to the housing of a deep-sea motor. The rotating sealing ring is fixedly connected to the rotating shaft of the deep-sea motor. The floating sealing ring is sleeved within the inner ring of the sealing housing. The static sealing ring is disposed between the floating sealing ring and the rotating sealing ring and can move along the axial direction of the rotating shaft, and the static sealing ring and the rotating sealing ring always remain in contact. The sealing housing forms a first cavity and a second cavity that are not interconnected. The first cavity is connected to the interior of the housing of the deep-sea motor, and the second cavity is connected to the outside. The floating sealing ring can move along the axial direction of the rotating shaft to change the space of the first cavity and the second cavity.

2. The single floating sealing structure according to claim 1, characterized in that, The sealing housing is detachably and fixedly connected to the housing of the deep-sea motor via a connector, and the sealing housing and the housing of the deep-sea motor are sealed at their contact surfaces by a sealing ring.

3. The single floating sealing structure according to claim 1, characterized in that, The rotary sealing ring is fixedly connected to the rotary shaft by a set screw, and the rotary sealing ring and the rotary shaft are sealed together by a sealing ring.

4. The single floating sealing structure according to claim 1, characterized in that, The floating sealing ring is sealed to the inner wall of the sealing housing via a sealing ring.

5. The single floating sealing structure according to claim 1, characterized in that, A preload spring is installed between the end of the floating sealing ring away from the deep-sea motor and the sealing housing.

6. The single floating sealing structure according to claim 1, characterized in that, The static sealing ring is fitted inside the floating sealing ring, and the static sealing ring and the floating sealing ring are sealed by a sealing ring. The static sealing ring is connected to the sealing housing by an anti-rotation pin.

7. The single floating sealing structure according to claim 1 or 6, characterized in that, A wave spring is installed between the end of the static sealing ring near the deep-sea motor and the housing of the deep-sea motor. The wave spring is in a compressed state, and under the force of the wave spring, the static sealing ring can be tightly fitted to the rotary sealing ring.

8. The single floating sealing structure according to claim 7, characterized in that, The static sealing ring includes a first connecting part and a second connecting part. The first connecting part and the second connecting part are an integral structure. The first connecting part is sealed to the floating sealing ring. The wave spring is installed between the second connecting part and the housing of the deep-sea motor. A contact surface is formed on the second connecting part that can abut against the rotating sealing ring.

9. The single floating sealing structure according to claim 1, characterized in that, A filter felt is provided between the sealed housing and the rotating shaft of the deep-sea motor.

10. A deep-sea power device, characterized in that, The invention includes a deep-sea motor and a single floating seal structure as described in any one of claims 1 to 9, wherein the single floating seal structure is disposed on the rotating shaft of the deep-sea motor. 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 them. 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 first cavity.

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