Combined dynamic sealing structure and underwater rotary connector
By adopting a combined dynamic sealing structure in the underwater rotary connector, sealing and lubrication is achieved using grease between the lubricating cavity and the seal, the problem of easy leakage of existing underwater rotary connectors is solved and the sealing reliability is improved.
Patent Information
- Application Number
- CN202420236785.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-31
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-01-31
AI Technical Summary
When existing underwater rotary connectors use dynamic sealing rings as dynamic sealing structures, leakage is prone to occur, and the internal sealing reliability is low.
A combined dynamic sealing structure is adopted, including a fixed part and a rotating part that are rotatably fitted through the shaft hole. A lubricating sealing structure is provided between the fixed part and the rotating part. The lubricating sealing structure includes a lubricating cavity, a first seal and a second seal, and the gap between the lubricating cavity and the seal is filled with grease to achieve sealing and lubrication.
Improves the dynamic seal reliability of the underwater rotating connector, reduces the risk of leakage, and can work normally in deep water environments.
Smart Images
Figure CN222615987U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of rotary connectors, and in particular relates to a combined dynamic sealing structure and an underwater rotary connector. Background Art
[0002] A rotary connector is a connection device that can realize relative rotation between the plug-in end and the plugged end, and is widely used in the field of underwater operations. For rotary connectors used in deep water environments, technicians usually fill liquid inside the rotary connector to balance the pressure inside and outside the rotary connector. However, for optoelectronic rotary connectors, filling liquid inside the rotary connector will affect the conduction performance of its internal light path. For rotary connectors like this that cannot be filled with liquid inside, the dynamic sealing structure on the rotary connector itself is generally used to resist the pressure difference inside and outside the connector.
[0003] Usually, technicians use dynamic seals as dynamic seal structures. However, dynamic seals cannot completely guarantee no leakage; and each dynamic seal has its own defects, which can easily lead to leakage in underwater rotary connectors that use dynamic seals as dynamic seal structures, and the internal sealing reliability is relatively low. Utility Model Content
[0004] The purpose of the utility model is to provide a combined dynamic sealing structure to solve the technical problem that the existing underwater dynamic sealing structure has poor sealing reliability. The purpose of the utility model is also to provide an underwater rotary connector to solve the technical problem that underwater rotary connectors using dynamic sealing rings as dynamic sealing structures are prone to leakage.
[0005] The utility model adopts the following technical solutions:
[0006] A combined dynamic sealing structure comprises a fixed part and a rotating part which are rotatably matched through an axial hole, a lubricating sealing structure is arranged between the fixed part and the rotating part, and the lubricating sealing structure comprises a lubricating cavity for filling with grease arranged on one of the fixed part and the rotating part; a first seal and a second seal are respectively arranged on the axial sides of the lubricating sealing structure, wherein the first seal is located on the axially outward side of the lubricating sealing structure so that one side thereof is in contact with the external environment and the other side is used to contact with the grease; the second seal is located on the axially inward side of the lubricating sealing structure so that one side thereof is used to contact with the grease.
[0007] Furthermore, the lubrication sealing structure comprises more than two lubrication cavities spaced apart in the axial direction, and a third sealing member is provided between at least one pair of adjacent lubrication cavities.
[0008] Furthermore, the first sealing member is a Variseal ring.
[0009] Furthermore, the second sealing member is a Glyd ring.
[0010] Furthermore, the third sealing member is a star ring.
[0011] Beneficial effects: The utility model improves the existing dynamic sealing structure, and specifically proposes a combined dynamic sealing structure. The combined dynamic sealing structure described in the utility model includes a fixed part and a rotating part that are rotatably matched through an axial hole. A lubricating sealing structure is arranged between the fixed part and the rotating part, and the lubricating sealing structure includes a lubricating cavity for filling with grease arranged on one of the fixed part and the rotating part, so as to provide grease to the rotating matching surface between the fixed part and the rotating part, thereby making the fixed part and the rotating part have lower rotational friction. At the same time, such an arrangement can use grease to fill the gap at the rotating matching surface to achieve a sealing effect. A first seal and a second seal are respectively arranged on the axial sides of the lubricating sealing structure, wherein the first seal is located on the axially outward side of the lubricating sealing structure, so that one side of it is in contact with the external water environment and the other side is used to contact with the grease. The second seal is located on the axially inward side of the lubricating sealing structure, so that one side of it is used to contact with the grease. On the one hand, such a setting can keep the grease provided by the lubrication chamber between the first seal and the second seal well; on the other hand, since the sealing form of the seal is different from that of the grease, the sealing failure of the seal will not have much impact on the sealing effect of the grease. Even if a small amount of leaked liquid squeezes into the combined dynamic sealing structure from the first seal under the action of external high pressure, the leaked liquid cannot leak further inward under the barrier of the grease. At the same time, the grease pressure in the lubrication chamber will increase, and eventually the pressure on both sides of the first seal will be close to equilibrium, thereby preventing external liquid from entering. Therefore, the above-mentioned combined dynamic sealing structure has good dynamic sealing reliability, and can be used as a zero-leakage dynamic sealing structure with regular maintenance.
[0012] An underwater rotary connector comprises a shell and at least one rotatable watertight socket rotatably engaged with the shell through an axial hole, wherein a dynamic sealing structure is arranged between the shell and the rotatable watertight socket; the dynamic sealing structure comprises a lubricating sealing structure arranged between the shell and the rotatable watertight socket, and the lubricating sealing structure comprises a lubricating cavity for filling with grease arranged on one of the shell and the rotatable watertight socket; a first seal and a second seal are respectively arranged on the axial sides of the lubricating sealing structure, wherein the first seal is located on the axially outward side of the lubricating sealing structure so that one side thereof is in contact with the external water environment and the other side thereof is used to contact with the grease; the second seal is located on the axially inward side of the lubricating sealing structure so that one side thereof is used to contact with the grease.
[0013] Furthermore, the underwater rotary connector further comprises at least one fixed watertight socket fixedly assembled on the housing, and at least two sockets are arranged at an angle.
[0014] Furthermore, the lubrication sealing structure comprises more than two lubrication cavities spaced apart in the axial direction, and a third sealing member is provided between at least one pair of adjacent lubrication cavities.
[0015] Furthermore, the first sealing member is a Variseal ring.
[0016] Furthermore, the second sealing member is a Glyd ring.
[0017] Furthermore, the third sealing member is a star ring.
[0018] Beneficial effects: The utility model improves the existing rotary connector and specifically proposes an underwater rotary connector. The underwater rotary connector of the utility model includes a shell and at least one rotatable watertight socket that is rotatably matched on the shell through an axial hole, and a dynamic sealing structure is arranged between the shell and the rotatable watertight socket. The dynamic sealing structure includes a lubricating sealing structure arranged between the shell and the rotatable watertight socket, and the lubricating sealing structure includes a lubricating cavity for filling grease arranged on one of the shell and the rotatable watertight socket, so as to provide grease to the rotating mating surface between the shell and the rotatable watertight socket, thereby making the shell and the rotatable watertight socket have lower rotational friction. At the same time, such a setting can use grease to fill the gap at the rotating mating surface to achieve a sealing effect. The first seal and the second seal are respectively arranged on the axial side of the lubricating sealing structure, wherein the first seal is located on the axially outward side of the lubricating sealing structure, so that one side of it is in contact with the external water environment and the other side is used to contact with the grease. The second seal is located on the axially inward side of the lubricating sealing structure, so that one side of it is used to contact with the grease. On the one hand, such a setting can keep the grease provided by the lubrication chamber well between the first seal and the second seal; on the other hand, since the sealing form of the seal is different from that of the grease, the sealing failure of the seal will not have much impact on the sealing effect of the grease. Even if a small amount of leaked liquid squeezes into the combined dynamic sealing structure from the first seal under the action of external high pressure, the leaked liquid cannot leak further inward under the barrier of the grease. At the same time, the grease pressure in the lubrication chamber will increase, and eventually the pressure on both sides of the first seal will be close to balance, thereby preventing external liquid from continuing to enter. Therefore, the above-mentioned dynamic sealing structure has good dynamic sealing reliability, and can be used as a zero-leakage dynamic sealing structure with regular maintenance; the underwater rotary connector using the above-mentioned dynamic sealing structure is not prone to leakage due to underwater high pressure, and can ensure normal operation in deep water environments. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1This is a structural schematic diagram of an embodiment of the underwater rotary connector of the utility model;
[0020] Figure 2 for Figure 1 A schematic diagram of the structure when the middle-group dynamic seal structure includes a lubrication chamber;
[0021] Figure 3 for Figure 1 A schematic diagram of the structure of the middle-group dynamic seal structure including two lubrication chambers;
[0022] The names of the components corresponding to the corresponding reference numerals in the figure are: 1. dynamic sealing structure; 2. fixed part; 3. rotating part; 4. lubrication chamber; 5. grease; 6. first sealing member; 7. second sealing member; 8. rotatable watertight socket; 9. fixed watertight socket; 10. housing; 11. fixing member; 12. flange; 13. rotating member; 14. socket body; 15. first sealing groove; 16. second sealing groove; 17. third sealing member; 18. third sealing groove; 19. bearing; 20. rotating mating surface. DETAILED DESCRIPTION
[0023] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.
[0024] The scheme principle of the underwater rotary connector described in the utility model is as follows:
[0025] An underwater rotary connector, the structure of which can refer to Figure 1 As shown. The underwater rotary connector includes a housing and at least one rotatable watertight socket 8 rotatably fitted on the housing through an axial hole, and a dynamic sealing structure 1 is arranged between the housing and the rotatable watertight socket 8. The dynamic sealing structure 1 includes a lubricating sealing structure arranged between the housing and the rotatable watertight socket 8, and the lubricating sealing structure includes a lubricating cavity 4 for filling with grease 5 arranged on one of the housing and the rotatable watertight socket 8, so as to provide grease 5 to the rotating mating surface 20 between the housing and the rotatable watertight socket 8, thereby making the housing and the rotatable watertight socket 8 have lower rotational friction. At the same time, such an arrangement can use grease 5 to fill the gap at the aforementioned rotating mating surface 20 to achieve a sealing effect.
[0026] For reference Figure 2As shown, the first seal 6 and the second seal 7 are respectively arranged on the axial side of the lubricating cavity 4, wherein the first seal 6 is located on the axially outward side of the lubricating sealing structure, so that one side thereof contacts the external water environment and the other side is used to contact the lubricating grease 5. The second seal 7 is located on the axially inward side of the lubricating sealing structure, so that one side thereof contacts the lubricating grease 5. Such a setting can, on the one hand, keep the lubricating grease 5 provided by the lubricating cavity 4 well between the first seal 6 and the second seal 7; on the other hand, since the sealing form of the seal is different from that of the lubricating grease 5, the sealing failure of the seal will not have much impact on the sealing effect of the lubricating grease 5. Even if a small amount of leaked liquid squeezes into the dynamic sealing structure 1 from the first seal 6 under the action of the external high pressure, the leaked liquid cannot further leak inward under the barrier of the lubricating grease 5. At the same time, the pressure of the lubricating grease 5 in the lubricating cavity 4 will increase, and eventually the pressure on both sides of the first seal 6 will be close to equilibrium, thereby preventing the external liquid from continuing to enter.
[0027] Therefore, the dynamic sealing structure 1 has good dynamic sealing reliability and can be used as a zero-leakage dynamic sealing structure 1 after regular maintenance. The underwater rotary connector using the dynamic sealing structure 1 is not prone to leakage due to underwater high pressure and can ensure normal operation in deep water environments.
[0028] Based on the above-mentioned principle, the embodiment 1 of the underwater rotary connector of the utility model is:
[0029] An underwater rotary connector, refer to Figure 1 As shown, it includes a housing and at least one rotatable watertight socket 8 rotatably matched on the housing through an axial hole, and a dynamic sealing structure 1 is arranged between the housing and the rotatable watertight socket 8. The dynamic sealing structure 1 includes a lubricating sealing structure arranged between the housing and the rotatable watertight socket 8, and the lubricating sealing structure includes a lubricating cavity 4 for filling with grease 5 arranged on one of the housing and the rotatable watertight socket 8, so as to provide grease 5 to the rotating matching surface 20 between the housing and the rotatable watertight socket 8. A first seal 6 and a second seal 7 are respectively arranged on the axial side of the lubricating sealing structure. The first seal 6 is located on the axially outward side of the lubricating cavity 4, so that one side of it is in contact with the external water environment and the other side is used to contact with the grease 5. The second seal 7 is located on the axially inward side of the lubricating sealing structure, so that one side of it is used to contact with the grease 5.
[0030] The key point of this embodiment is that the underwater rotary connector also includes at least one fixed watertight socket 9 fixedly assembled on the shell. On this basis, the fixed watertight sockets 9, or the rotatable watertight sockets 8, or the rotatable watertight sockets 8 and the fixed watertight sockets 9 are arranged at an angle. In this embodiment, the underwater rotary connector specifically includes a rotatable watertight socket 8 and a fixed watertight socket 9, and the aforementioned dynamic sealing structure 1 is arranged between the rotatable watertight socket 8 and the shell. The shell of the underwater rotary connector specifically includes an outer shell 10 and a fixing member 11 fixed in the outer shell 10, and the fixing member 11 is arranged on one end of the outer shell 10, and a flange 12 is arranged on it to achieve the fixing of the shell. The rotatable watertight socket 8 includes a rotating member 13 and a socket seat body 14, and the socket seat body 14 is fixed in the axial direction and sealed in the rotating member 13, so as to rotate synchronously with the rotation of the rotating member 13. It should be noted that the fixing member 11 here corresponds to the fixed part 2 in the combined dynamic sealing structure described in the utility model; the rotating member 13 here corresponds to the rotating part 3 in the combined dynamic sealing structure described in the utility model. A lubrication cavity 4 for filling grease 5 is provided on the rotating mating surface 20 of the fixed part 11 relative to the rotating part 13, and a first sealing groove 15 and a second sealing groove 16 are respectively provided on both sides of the lubrication cavity 4 to install the first sealing member 6 and the second sealing member 7. Of course, it is easy to imagine that the lubrication cavity 4, the first sealing groove 15, and the second sealing groove 16 can also be provided on the rotating part 13. A bearing 19 is also provided between the fixed part 11 and the rotating part 13 to reduce the rotational friction between the two.
[0031] The fixed watertight socket 9 is radially fixed on the other end of the aforementioned housing 10 relative to the fixing member 11, and the two are sealed and connected. The fixed watertight socket 9 and the rotatable watertight socket 8 are arranged at an angle, such as 90 degrees, so that the watertight plugs respectively plugged into the rotatable watertight socket 8 and the fixed watertight socket 9 are also arranged at 90 degrees. Such a setting makes the two ends connected by the underwater rotary connector have a positional relationship of 90 degrees, which can meet the wiring space requirements in this scenario. Of course, the aforementioned 90 degrees is only a specific example for the convenience of explanation. In actual implementation, the fixed watertight socket 9 and the rotatable watertight socket 8 can also be arranged at other angles according to actual needs, such as 30 degrees, 60 degrees, 120 degrees, 150 degrees, 180 degrees, etc., and the installation structure corresponding to the fixed watertight socket 9 and the installation structure corresponding to the rotatable watertight socket 8 on the housing are correspondingly adjusted adaptively, so that the two ends connected by the underwater rotary connector have a positional relationship corresponding to the aforementioned angle, thereby meeting the wiring space requirements in different scenarios. In addition, it should be noted that all static seals on the underwater rotary connector are sealed with no less than 2 O-rings.
[0032] Of course, the aforementioned "the underwater rotary connector specifically includes a rotatable watertight socket 8 and a fixed watertight socket 9" is only a specific example for the convenience of explanation. The number of specific rotatable watertight sockets 8 and the number of fixed watertight sockets 9 on the underwater rotary connector should be determined according to the actual connection requirements. For example, the underwater rotary connector can also specifically include two, three, four or even more rotatable watertight sockets 8; it can also specifically include two, three, four or even more fixed watertight sockets 9. On this basis, the fixed watertight sockets 9, or the rotatable watertight sockets 8, or the rotatable watertight sockets 8 and the fixed watertight sockets 9 are arranged at an angle to meet specific wiring requirements.
[0033] On the basis of the above structure, the lubrication sealing structure may include more than two lubrication chambers 4 arranged at intervals along the axial direction, and a third sealing member 17 is provided between at least one pair of adjacent two lubrication chambers 4. Figure 3 As shown, the lubrication sealing structure includes two lubrication chambers 4 arranged in parallel along the axial direction, the first seal 6 is arranged on the side of the two lubrication chambers 4 facing the outside of the underwater rotary connector, and the second seal 7 is arranged on the side of the two lubrication chambers 4 facing the inside of the underwater rotary connector. A third sealing groove 18 is arranged on the fixed part 2 between the two lubrication chambers 4 to install the third seal 17. Such an arrangement not only satisfies the dynamic sealing, but also improves the reliability of the dynamic sealing structure 1 through the organic superposition of the first seal 6, the second seal 7, and the third seal 17. At the same time, multiple lubrication chambers 4 can provide lubrication for the rotating mating surfaces 20 between the first seal 6 and the third seal 17, and between the second seal 7 and the third seal 17; at the same time, fill the mating gap on the dynamic rotating mating surface 20, making it more difficult for external liquid to further squeeze into the underwater rotary connector. Of course, please refer to Figure 2 As shown, the lubricating seal structure may include only one lubricating cavity 4 arranged at intervals in the axial direction, and on this basis, the third seal 17 may not be required. Since the working environment of the second seal 7 is relatively good at this time, the second seal 7 is preferably a star ring with outstanding sealing effect. On this basis, the first seal ring is preferably a corrosion-resistant pan-seal ring.
[0034] It should be noted here that the aforementioned "lubricating sealing structure includes two lubricating chambers 4 arranged in parallel along the axial direction" is only a specific example given for the convenience of explanation. In actual implementation, the number of lubricating chambers 4 can be set according to actual sealing requirements. For example, the number of lubricating chambers 4 can be three, four, five or even more. On this basis, the arrangement positions and arrangement numbers of the third sealing grooves 18 and the third sealing members 17 can also be adaptively changed. For example, when there are three lubricating chambers 4, the third sealing grooves 18 can be arranged at two intervals between the three lubricating chambers 4 to facilitate the installation of the third sealing member 17, or the third sealing member 17 and the third sealing groove 18 can be arranged at only one of the intervals. When the number of lubricating chambers 4 is four, five or even more, the arrangement can refer to the above and will not be repeated here.
[0035] Based on the above scheme principle and embodiment 1, embodiment 2 of the underwater rotary connector of the utility model is:
[0036] Compared with Example 1, the key point of this embodiment is that reference can be made to Figure 3 As shown, a Varisal ring can be used as the first seal 6. As a single-acting seal, the Varisal ring is usually made of polytetrafluoroethylene and Hastelloy. Since the initial seal of the Varisal ring relies on the spring, the greater the pressure, the better the sealing effect, so it is suitable for dynamic sealing scenarios of reciprocating and rotating motions, and is especially suitable for high-pressure dynamic sealing. In addition, the first seal 6 is in contact with the external water environment during operation, and the working environment is relatively harsh. The Varisal ring has good wear resistance, can adapt to most fluids, chemicals and gases, can withstand drastic changes in temperature, and is very resistant to aging, so it can work normally in various harsh environments. Therefore, the use of the Varisal ring as the first seal 6 can ensure that the underwater rotary connector has a good and reliable sealing effect at the first seal 6 when it works normally underwater. Of course, when the cost is limited, ordinary O-rings, grid rings or star rings can also be used to replace the first seal 6.
[0037] On the basis of the above structure, preferably, a Glyd ring can be used as the second seal 7. The Glyd ring is generally made of polytetrafluoroethylene and rubber with self-lubricating effect, and has its own coarse oil groove, so it can be used alone as a dynamic seal. Due to its good wear resistance, it can achieve a reliable dynamic sealing effect at the second seal 7. Of course, ordinary O-rings, Variseal rings or star rings can also be used here to replace the Glyd ring.
[0038] Furthermore, the third seal 17 can be a star ring. The star ring is generally made of rubber material with good material density, and thus has high sealing reliability. In addition, the star ring has a double-lip sealing structure, which can achieve bidirectional sealing in the axial and radial directions; and it can achieve the sealing function through the superposition of the pre-compression stress during installation and the working pressure, so it can significantly improve the dynamic sealing effect when used under the condition of a good inner working environment. In addition, grease 5 can be filled between the two sealing lips of the star ring to achieve the dual effects of lubrication and sealing, making the star ring more practical than a general sealing ring. Of course, when the cost is limited, ordinary O-rings, pan-seal rings or grid rings can also be used instead of star rings.
[0039] It should be emphasized that when the dynamic seal structure is a combined dynamic seal structure formed by connecting the grid ring, star ring and pan seal ring in series from the inside to the outside, since the three seals have different sealing forms, different compression amounts and different friction pair characteristics, the sealing failure of any one of the seals will not have a direct impact on the sealing of other seals. At the same time, the above structure can organically combine the advantages of the three seals, greatly improving the dynamic sealing reliability of the underwater rotary connector.
[0040] The parts not emphasized in this embodiment are consistent with those in Embodiment 1.
[0041] Embodiments of the combined dynamic sealing structure of the utility model:
[0042] The embodiment of the combined dynamic sealing structure of the present invention is consistent with the principle of the underwater rotary connector and the part about the dynamic sealing structure 1 in embodiments 1 and 2, so it will not be described in detail here.
[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the description and drawings of the present invention shall be included in the protection scope of the present invention.
Claims
1. A combined dynamic sealing structure, characterized in that: The invention comprises a fixed part (2) and a rotating part (3) which are rotatably matched through an axial hole, a lubricating sealing structure being arranged between the fixed part (2) and the rotating part (3), the lubricating sealing structure comprising a lubricating cavity (4) arranged on one of the fixed part (2) and the rotating part (3) and used to be filled with lubricating grease (5); a first sealing member (6) and a second sealing member (7) are arranged on the axial sides of the lubricating sealing structure, respectively, wherein the first sealing member (6) is located on the axially outward side of the lubricating sealing structure so that one side thereof contacts the external environment and the other side thereof contacts the lubricating grease (5); and the second sealing member (7) is located on the axially inward side of the lubricating sealing structure so that one side thereof contacts the lubricating grease (5).
2. The combined dynamic sealing structure according to claim 1, characterized in that: The lubricating sealing structure comprises more than two lubricating cavities (4) arranged at intervals along the axial direction, and a third sealing member (17) is provided between at least one pair of adjacent two lubricating cavities (4).
3. The combined dynamic sealing structure according to claim 1 or 2, characterized in that: The first sealing element (6) is a Variseal ring.
4. The combined dynamic sealing structure according to claim 1 or 2, characterized in that: The second sealing member (7) is a Glyd ring.
5. The combined dynamic sealing structure according to claim 2, characterized in that: The third sealing member (17) is a star-shaped ring.
6. An underwater rotary connector, comprising a housing and at least one rotatable watertight socket (8) rotatably engaged with the housing through an axial hole, wherein a dynamic sealing structure is provided between the housing and the rotatable watertight socket (8); characterized in that: The dynamic sealing structure comprises a lubricating sealing structure arranged between a housing and a rotatable watertight socket (8), the lubricating sealing structure comprising a lubricating cavity (4) arranged on one of the housing and the rotatable watertight socket (8) and used to fill with lubricating grease (5); a first sealing member (6) and a second sealing member (7) are respectively arranged on the axial side of the lubricating sealing structure, wherein the first sealing member (6) is located on the axially outward side of the lubricating sealing structure so that one side thereof contacts the external water environment and the other side is used to contact the lubricating grease (5); and the second sealing member (7) is located on the axially inward side of the lubricating sealing structure so that one side thereof contacts the lubricating grease (5).
7. The underwater rotary connector according to claim 6, characterized in that: The underwater rotary connector also includes at least one fixed watertight socket (9) fixedly mounted on the housing, and at least two sockets are arranged at an angle.
8. The underwater rotary connector according to claim 6 or 7, characterized in that: The lubricating sealing structure comprises more than two lubricating cavities (4) arranged at intervals along the axial direction, and a third sealing member (17) is provided between at least one pair of adjacent two lubricating cavities (4).
9. The underwater rotary connector according to claim 8, characterized in that: The first sealing element (6) is a Variseal ring.
10. The underwater rotary connector according to claim 8, characterized in that: The second sealing member (7) is a Glyd ring.
11. The underwater rotary connector according to claim 8, characterized in that: The third sealing member (17) is a star-shaped ring.