An underwater pluggable electrical connector with a dual redundant sealing structure

Abstract

The present invention discloses an underwater plug-in electrical connector with a dual redundant sealing structure, which adopts two groups of radial seals and two groups of oil bags to construct a cavity packaging structure with double oil-filled pressure balance. After multiple plug-ins in a deep-sea muddy environment, the first radial seal is worn, and the small amount of seawater that penetrates enters the first oil bag for sedimentation under its own gravity, and does not directly penetrate into the second oil-filled cavity, causing failure of electrode coupling. In addition, since the front and rear cavities of the second radial dynamic seal are both oil-filled environments, an oil film lubrication can be formed between the friction pairs of the second dynamic seal, which greatly reduces the axial friction caused by the dynamic seal. The present invention greatly improves the application depth of the underwater plug-in electrical connector, which can be used in full sea depth environments (≮11,000 meters), and increases the number of plug-ins and pull-outs in underwater high-pressure environments, and has high application reliability.

Description

Technical Field

[0001] The invention relates to the technical field of underwater engineering connection, and in particular to an underwater plug-in electrical connector with a double redundant sealing structure. Background Art

[0002] As an important component of underwater engineering projects, underwater plug-in electrical connectors are widely used in seabed observation networks, offshore drilling and production platforms, ocean energy development and various types of submarine engineering equipment. The demand for underwater plug-in electrical connectors is increasing, and higher requirements are placed on their performance indicators, reliability and service life.

[0003] In recent years, my country has made outstanding progress in the field of dry plug connector technology. There are many related patents and related products are widely used underwater. However, this technology can only be plugged and unplugged on land. It cannot be applied underwater to some engineering projects that require underwater connection. At present, there are still many technical problems in the domestically developed electrical connectors with underwater plug-in capability. For example, Shenyang Xinghua Aviation Electrical Co., Ltd. invented "A Wet Plug Sealed Underwater Connector", patent number "CN209001274U". This technology can be used for shallow underwater plug-in, but because it does not adopt the oil-filled pressure balance structure, in deep water environment, the pressure difference between the inside and outside of the connector cavity is large, resulting in additional shaft when plugging and unplugging. The downward force is large, and effective plugging and unplugging cannot be carried out; Zhejiang University invented "An Underwater Wet Plug and Unplug Pressure Balanced Electrical Connector", patent number "202011438788.6", which uses the method of oil-filled pressure balance in the socket cavity to balance the pressure inside and outside the connector, realizing effective plugging and unplugging in deep-sea environments. This technology uses a shuttle pin (stop piston) and a radial sealing ring made of insulating material to form an initial dynamic seal, and axially guides the electrical pins with the same axial diameter during the plugging and unplugging process. With the help of the "relay" dynamic seal between the shuttle pin and the electrical pin and the radial sealing ring, the socket sealing cavity is always in a closed state isolated from seawater during the insertion and removal of the electrical pin, thereby achieving effective sealing during the coupling process of the battery cell electrodes. Although this patent adopts the form of oil-filled pressure balance, there is only one set of sealing rings to protect the radial dynamic seal that is most prone to leakage. Due to the ultra-high pressure environment in the deep sea, the contact pressure between the radial sealing ring and the shuttle pin or electrical pin shaft is not less than the seawater environment pressure, and the contact interface of the dynamic seal is also very likely to cause the invasion of seabed mud and sand during the connector plugging and unplugging process, causing friction and wear on the radial sealing ring during the plugging and unplugging process, causing seawater to infiltrate and the connector battery cell electrode coupling to fail. Summary of the invention

[0004] Based on this, the present invention provides an underwater pluggable electrical connector with a dual redundant sealing structure, which solves the technical problem that the radial sealing ring of the existing underwater pluggable electrical connector is prone to failure, causing the coupling failure of the connector battery core electrodes.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0006] An underwater pluggable electrical connector with a dual redundant sealing structure, comprising a pin end I and a socket end II, wherein the pin end I comprises a pin packaging housing and an electrical pin, and the socket end II comprises:

[0007] jack packaging housing;

[0008] An insulating support fixedly connected to the jack packaging shell;

[0009] A jack end cover is located at one end of the jack packaging shell, and the jack end cover is sealed and fixedly connected to the insulating support; a through hole is opened on the jack end cover, and a first radial seal is installed in the through hole of the jack end cover;

[0010] An insulating support tail end fixedly connected to the other end of the jack packaging shell;

[0011] A first oil bag, the first oil bag is sealed and installed on the insulating support and the tail end of the insulating support; the first oil bag, the insulating support, the tail end of the insulating support and the jack end cover form a first oil-filled cavity;

[0012] A socket cell assembly is fixed on the insulating support and the tail end of the insulating support; the socket cell assembly includes a shuttle pin shaft, a second radial seal, a socket body, a connector, a compression spring, a tail end body and a second oil bag; the socket body has a through hole, and the second radial seal is installed in the through hole of the socket body; the connector is used to connect the socket body and the tail end body; the shuttle pin shaft is sealed with the second radial seal, the shuttle pin shaft is sealed with the first radial seal, and the shuttle pin shaft is partially located in the connector; the compression spring is located in the connector and is used to support the tail end body and the shuttle pin shaft; the second oil bag is used to connect the socket body and the tail end body, the socket body and the connector are provided with oil holes, and the socket body, the second oil bag and the tail end body form a second oil filling chamber;

[0013] The second oil-filling chamber is located in the first oil-filling chamber.

[0014] The underwater pluggable electrical connector with a dual redundant sealing structure as described above, wherein the first oil-filling chamber comprises a left oil-filling chamber and a right oil-filling chamber, wherein the left oil-filling chamber is located between the insulating support and the jack end cover, and the right oil-filling chamber is located between the insulating support and the insulating support tail end; and a through hole connecting the left oil-filling chamber and the right oil-filling chamber is provided on the insulating support;

[0015] In the underwater pluggable electrical connector with a dual redundant sealing structure as described above, the through hole connecting the left oil-filled chamber and the right oil-filled chamber includes a central through hole and a plurality of peripheral through holes located around the central through hole.

[0016] In the underwater pluggable electrical connector with a dual redundant sealing structure as described above, the peripheral through hole is an inclined through hole, and the distance between the peripheral through hole and the central through hole gradually decreases in the direction from the insulating support tail end to the jack end cover.

[0017] In the underwater pluggable electrical connector with a dual redundant sealing structure as described above, the end surface of the insulating support located in the left oil-filled cavity is an inner cone, and the lowest end of the inner cone is located at the central through hole.

[0018] In the underwater pluggable electrical connector with a dual redundant sealing structure as described above, an oil filling hole is provided on the jack end cover, and the oil filling hole is sealed by a first plug.

[0019] In the underwater pluggable electrical connector with a dual redundant sealing structure as described above, an elastic pressure ring is provided on the socket body, and the elastic pressure ring is used to adjust the degree of end face extrusion of the second radial seal.

[0020] As described above, in the underwater plug-in electrical connector with a dual redundant sealing structure, a socket cap is arranged in the socket body, the socket cap is connected to the connector, a crown spring is arranged in the socket cap, and the shuttle pin shaft passes through the socket cap and the crown spring.

[0021] In the underwater pluggable electrical connector with a dual redundant sealing structure as described above, the insulating support has an oil filling cavity for filling oil for the socket battery assembly, and the oil through hole of the socket body is located in the oil filling cavity.

[0022] In the underwater pluggable electrical connector with a dual redundant sealing structure as described above, a radial oil injection channel communicating with the oil injection cavity is provided on the insulating support, and the radial oil injection channel is sealed by a second plug.

[0023] Compared with the prior art, the advantages and positive effects of the present invention are: the underwater plug-in electrical connector of the dual redundant sealing structure of the present invention adopts two groups of radial seals and two groups of oil bags to construct a cavity packaging structure with double oil-filled pressure balance. After multiple plug-ins and pull-outs in a deep-sea muddy environment, the first radial seal is worn, and the small amount of seawater that penetrates enters the first oil bag for sedimentation under its own gravity, and will not directly penetrate into the second oil-filled cavity, causing failure of electrode coupling. In addition, since the front and rear cavities of the second radial dynamic seal are both oil-filled environments, an oil film lubrication can be formed between the friction pairs of the second dynamic seal, greatly reducing the axial friction caused by the dynamic seal. The present invention greatly improves the application depth of the underwater plug-in electrical connector, which can be used in full sea depth environments (≮11,000 meters), and increases the number of plug-ins and pull-outs in underwater high-pressure environments, with high application reliability.

[0024] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 is a schematic diagram of a specific embodiment of the present invention;

[0027] Figure 2 for Figure 1 Sectional view along AA direction;

[0028] Figure 3 for Figure 1 Cross-sectional view along BB direction;

[0029] Figure 4 for Figure 2 Sectional view along CC direction;

[0030] Figure 5 is a cross-sectional view of an electrical plug pin according to a specific embodiment of the present invention;

[0031] Figure 6 It is a cross-sectional view of a socket battery assembly according to a specific embodiment of the present invention;

[0032] Figure 7 It is a schematic diagram of the plugging and unplugging process of a specific embodiment of the present invention.

[0033] Description of reference numerals:

[0034] Pin package housing 1; electrical pin 2; metal copper conductor 3; polymer insulating material 4; radial sealing ring 5; rear end cavity 6; socket battery assembly 7; insulating support 8; insulating support tail end 9; first radial seal 10; first oil bag 11; first oil bag locking pressure ring 12; socket end cover 13; socket package housing 14; mounting hole 15; shoulder 16; mounting hole 17; shoulder 18; first plug 19; radial sealing ring 20; mounting bolt 21; shuttle pin shaft 22; through hole 23; Inclined through hole 24; inner cone 25; first oil-filling chamber 26; left oil-filling chamber 27; right oil-filling chamber 28; water-permeable hole 29; positioning pin 30; screw 31; second radial seal 32; elastomeric pressure ring 33; socket body 34; crown spring 35; socket cap 36; connecting body 37; compression spring 38; tail end body 39; second oil bag 40; oil filling chamber 41; oil filling channel 42; second plug 43; combined sealing ring 44; radial sealing ring 45; radial sealing ring 46; second oil-filling chamber 47. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0036] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] like Figure 1-7 As shown, the underwater plug-in electrical connector with a dual redundant sealing structure of this embodiment includes a pin end I and a jack end II. The pin end I and the jack end II are both integrated with the same number and the same hole positions of coupling cells. The number of coupling cells can be single-core or multi-core. In this embodiment, the number of coupling cells is 12 cores.

[0038] The pin terminal 1 comprises a pin packaging shell 1 and an electrical pin 2.

[0039] like Figure 2 , 3 As shown in Figures 5 and 6, the electric pin 2 is formed into one body by a metal copper conductor 3 and a polymer insulating material 4 through a molding process such as gluing, vulcanization or molding, so that it has a strong bonding strength and can prevent seawater from penetrating at the contact interface between the two. The electric pin 2 is sealed and installed on the pin packaging shell 1 through a group of radial sealing rings 5, so that the rear end cavity 6 of the pin end I forms a closed cavity. The rear end cavity 6 can be connected to the watertight cable by means of glue injection and vulcanization, and can also be connected to the oil-filled pipe by means of glue injection and oil filling.

[0040] The jack end II mainly includes a jack packaging shell 14, an insulating support 8, a jack end cover 13, an insulating support tail end 9, a first oil bag 11 and a jack battery cell assembly 7.

[0041] The insulating support 8 is fixedly connected to the jack packaging shell 14. The jack end cover 13 is located at one end of the jack packaging shell 14, and the jack end cover 13 is sealed and fixedly connected to the insulating support 8; a through hole is opened on the jack end cover 13, and a first radial seal 10 is installed in the through hole of the jack end cover 13; an oil filling hole is opened on the jack end cover 13, and the oil filling hole is sealed by a first plug 19. The insulating support tail end 9 is fixedly connected to the other end of the jack packaging shell 14. The first oil sac 11 is sealed and installed on the insulating support 8 and the insulating support tail end 9; the first oil sac 11, the insulating support 8, the insulating support tail end 9 and the jack end cover 13 form a first oil filling chamber 26. The jack battery assembly 7 is fixed on the insulating support 8 and the insulating support tail end 9. The first oil-filling chamber 26 includes a left oil-filling chamber 27 and a right oil-filling chamber 28. The left oil-filling chamber 27 is located between the insulating support 8 and the jack end cover 13, and the right oil-filling chamber 28 is located between the insulating support 8 and the insulating support tail end 9. The insulating support 8 is provided with through holes 23 and 24 connecting the left oil-filling chamber 27 and the right oil-filling chamber 28. The through holes of the left oil-filling chamber 27 and the right oil-filling chamber 28 include a central through hole 23 and a plurality of peripheral through holes 24 located around the central through hole 23. The peripheral through holes 24 are inclined through holes, and the distance between the peripheral through holes 24 and the central through hole 23 gradually decreases in the direction from the insulating support tail end 9 to the jack end cover 13. The end face of the insulating support 8 located at the left oil-filling chamber 27 is an inner cone 25, and the lowest end of the inner cone 25 is located at the central through hole 23.

[0042] Specifically, the jack end II is mainly composed of the jack battery assembly 7, the insulating support 8, the insulating support tail end 9, the first radial seal 10, the first oil bag 11, the first oil bag locking pressure ring 12, the jack end cover 13 and the jack packaging shell 14. The jack battery assembly 7 is matched with the shaft hole through the mounting hole 15 and the shaft shoulder 16 of the insulating support 8 and the mounting hole 17 and the shaft shoulder 18 of the insulating support tail end 9, and is axially fixed. The jack end cover 13 is sealed and fixed with the insulating support 8 through the radial sealing ring 20 and the mounting bolt 21. The jack end cover 13 is provided with an oil filling hole and is sealed by the first plug 19; the jack end cover 13 is provided with through holes of the same number and position as the jack battery assembly 7, and the first radial seal 10 is installed in the through hole. The first radial seal 10 can be a combination of radial seals in the form of a single or several O-rings, rectangular seals, lip rings, etc., and this embodiment only embodies a single radial seal. The shuttle pin shaft 22 in the socket cell assembly 7 passes through the first radial seal 10 and cooperates with the axial hole under the radial seal formed by the socket end cover 13. The first oil bag 11 is an elastomer. The first oil bag 11 is respectively installed on the outer cylindrical surface of the insulating support 8 and the insulating support tail end 9 through two first oil bag locking rings 12. The first oil bag locking ring 12 can be screwed in and fixed by an internal thread ring, or it can be fixed by a radial bolt. In this embodiment, the internal thread ring is screwed in and fixed to the first oil bag 11. The contact surface of the first oil bag 11 is circumferentially compressed to form a seal. Figure 2 , 3 As shown, the insulating support 8 is a cylinder, the inner axis of the insulating support 8 is provided with a through hole 23, and the periphery of the through hole 23 is evenly distributed with a plurality of inclined through holes 24. In the direction shown in the figure, the left end face of the insulating support 8 is an inner conical surface 25; therefore, the insulating support 8, the insulating support tail end 9, the first oil bag 11, the jack end cover 13 and the jack battery cell assembly 7 together constitute a first oil filling cavity 26, as shown in FIG. Figure 2 As shown, the first oil-filled chamber 26 is divided into a left oil-filled chamber 27 and a right oil-filled chamber 28. A plurality of water-permeable holes 29 are opened on the cylindrical surface of the jack packaging shell 14. The jack packaging shell 14 is fixedly connected to the insulating support 8 through a positioning pin 30, and the jack packaging shell 14 is fixedly connected to the insulating support tail end 9 through a screw 31.

[0043] like Figure 2 , 3 As shown in FIGS. 4 and 6, the socket cell assembly 7 mainly includes a shuttle pin shaft 22, a second radial seal 32, a socket body 34, a connector 37, a compression spring 38, a tail end body 39 and a second oil bag 40. The socket body 34 has a through hole, and the second radial seal 32 is installed in the through hole of the socket body 34. The connector 37 is used to connect the socket body 34 and the tail end body 39. The shuttle pin shaft 22 is sealed with the second radial seal 32, and the shuttle pin shaft 22 is sealed with the first radial seal 10, and the shuttle pin shaft 22 is partially located in the connector 37. The compression spring 38 is located in the connector 37 and is used to support the tail end body 39 and the shuttle pin shaft 22. The second oil bag 40 is used to connect the socket body 34 and the tail end body 39. The socket body 34 and the connector 37 are provided with oil holes. The socket body 34, the second oil bag 40 and the tail end body 39 form a second oil filling chamber 47, and the second oil filling chamber 47 is located in the first oil filling chamber 26. An elastic body pressing ring 33 is provided on the socket body 34, and the elastic body pressing ring 33 is used to adjust the end face extrusion degree of the second radial seal 32. A socket cap 36 is provided in the socket body 34, and the socket cap 36 is connected to the connecting body 37. A crown spring 35 is provided in the socket cap 36, and the shuttle pin shaft 22 passes through the socket cap 36 and the crown spring 35. An oil filling cavity 41 for filling oil for the socket battery assembly 7 is provided on the insulating support 8, and the oil hole of the socket body 34 is located in the oil filling cavity 41. A radial oil filling channel 42 connected to the oil filling cavity 41 is provided on the insulating support 8, and the radial oil filling channel 42 is sealed by a second plug 43.

[0044] Specifically, the socket cell assembly 7 is composed of the shuttle pin shaft 22, the second radial seal 32, the elastic body pressure ring 33, the socket body 34, the crown spring 35, the socket cap 36, the connector 37, the compression spring 38, the tail end body 39 and the second oil bag 40. The socket cap 36 and the connector 37 are installed and connected by the interference fit of the shaft hole, and the connector 37 and the tail end body 39 are also installed and connected by the interference fit of the shaft hole. The shuttle pin shaft 22 and the compression spring 38 are placed in the connector 37. The compression spring 38 always axially presses the shuttle pin shaft 22 under the initial compression. The crown spring 35 is installed in the socket cap 36, and the socket cap 36 is axially positioned by the shaft shoulder of the socket body 34. Figure 4 As shown, the insulating support 8 is provided with an oil filling cavity 41 for each plug-in cell assembly 7, each oil filling cavity 41 is provided with a radial oil filling channel 42, each oil filling channel 42 is sealed by a second plug 43 using a combined sealing ring 44, and the second plug 43 is fixedly connected to the insulating support 8 by a thread. Figure 3 As shown, the jack cell assembly 7 is sealed and installed with the insulating support 8 through the radial sealing ring 45, and the jack cell assembly 7 is sealed and installed with the insulating support tail end 9 through the radial sealing ring 46. The second oil bag 40 is an elastomer, and the left side of the second oil bag 40 forms a circumferential extrusion seal through the jack body 34 and the insulating support 8, and the right side of the second oil bag 40 forms a circumferential extrusion seal through the tail end body 39 and the insulating support tail end 9; the second radial seal 32 is a circular elastomer, and the second radial seal 32 is placed in the jack body 34 and cooperates with the shaft hole of the shuttle pin shaft 22 to form a second radial seal, and the elastic body pressing ring 33 is fixed on the inner hole of the jack body 34 through an external thread. By adjusting the axial locking distance of the elastic body pressing ring 33, the end face extrusion degree of the second radial seal 32 can be changed, thereby adjusting the radial pre-tightening contact force between the second radial seal 32 and the shuttle pin shaft 22. Therefore, the plug-in cell assembly 7, the insulating support 8, the insulating support tail 9, the second radial seal 32 and the second plug 43 are combined to form a second oil-filled cavity 47. Each plug-in cell assembly 7 can form an independently sealed second oil-filled cavity 47. Several independently sealed second oil-filled cavities 47 are placed in the first oil-filled cavity 26, thus forming a double redundant oil-filled pressure balance sealing structure in which the cells are independently oil-filled and sealed and then the entire oil-filled and sealed. Several through holes and oil holes are opened on the cylindrical surface of the plug-in body 34 and the connector 37, so that the oil injected into the radial oil-filling channel 42 can fill the entire second oil-filled cavity 47 without the existence of a cavity phenomenon.

[0045] like Figure 7As shown, the working principle of the underwater plug-in electrical connector is as follows: the first oil-filled cavity 26 and the second oil-filled cavity 47 are completely filled with insulating oil liquid, leaving no gap cavity. When the underwater plug-in connector is placed in a deep sea environment, the pressure in the oil cavity is always approximately equal to the external seawater pressure; the pin end I is inserted into the socket end II, and the electric pin 2 first contacts the axial end surface of the shuttle pin shaft 22, and the electric pin 2 continues to move axially against the shuttle pin shaft 22, and the first radial seal 10 gradually transitions from the original radial dynamic seal with the shuttle pin shaft 22 to the radial dynamic seal with the electric pin 2, and the second radial seal 32 gradually transitions from the original radial dynamic seal with the shuttle pin shaft 22 to the radial dynamic seal with the electric pin 2. During the entire movement process, the first oil-filled cavity 26 and the second oil-filled cavity 47 in the socket end II are always isolated from the external water medium, so that the metal copper conductor 3 in the electric pin 2 and the crown spring 35 are always in the environment of insulating oil when the battery cell electrodes are coupled.

[0046] The through hole 23, the inclined through hole 24 and the left inner cone 25 of the insulating support 8 have the following functions: when the underwater plug-in electrical connector is used for seabed connection, it is generally installed at an angle of about 30° to the vertical line. The seabed mud environment is harsh. The first radial seal 10 has friction and wear caused by dynamic seals during the plug-in process, resulting in a small amount of seawater infiltrating into the first oil-filling chamber 26. Since the density of seawater is greater than the density of the insulating oil, and due to the inclined installation of the underwater connector and the diversion effect of the through hole 23, the inclined through hole 24 and the inner cone 25 on the insulating support 8, the infiltrated seawater can flow from the left oil-filling chamber 27 to the right oil-filling chamber 28 under the action of gravity without affecting the second radial seal 32, making the protective effect of the dual redundant oil-filling pressure balance more effective, further improving the reliability of underwater applications.

[0047] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to replace some of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions claimed to be protected by the present invention.

Claims

1. An underwater pluggable electrical connector with a dual redundant sealing structure, comprising a pin end I and a socket end II, wherein the pin end I comprises a pin packaging housing (1) and an electrical pin (2), characterized in that: The jack end II comprises: A jack packaging housing (14); An insulating support (8) fixedly connected to the jack packaging shell (14); A jack end cover (13) is located at one end of the jack encapsulation shell (14), and the jack end cover (13) is sealed and fixedly connected to the insulating support (8); a through hole is formed on the jack end cover (13), and a first radial seal (10) is installed in the through hole of the jack end cover (13); An insulating support tail end (9) fixedly connected to the other end of the jack packaging shell (14); A first oil bag (11), the first oil bag (11) being sealingly mounted on the insulating support (8) and the insulating support tail end (9); the first oil bag (11), the insulating support (8), the insulating support tail end (9) and the jack end cover (13) enclose a first oil-filled cavity (26); A plug-in battery cell assembly (7) is fixed on the insulating support (8) and the insulating support tail end (9); the plug-in battery cell assembly (7) comprises a shuttle pin shaft (22), a second radial seal (32), a plug-in body (34), a connector (37), a compression spring (38), a tail end body (39) and a second oil bag (40); the plug-in body (34) has a through hole, and the second radial seal (32) is installed in the through hole of the plug-in body (34); the connector (37) is used to connect the plug-in body (34) and the tail end body (39); the shuttle pin shaft (22) and the second radial seal (32) sealing cooperation, the shuttle pin shaft (22) and the first radial seal (10) are sealing cooperation, and the shuttle pin shaft (22) is partially located in the connecting body (37); the compression spring (38) is located in the connecting body (37) and is used to support the tail end body (39) and the shuttle pin shaft (22); the second oil bag (40) is used to connect the plug body (34) and the tail end body (39), the plug body (34) and the connecting body (37) are provided with oil holes, and the plug body (34), the second oil bag (40) and the tail end body (39) form a second oil filling chamber (47); The second oil-filling chamber (47) is located inside the first oil-filling chamber (26).

2. The underwater pluggable electrical connector with a dual redundant sealing structure according to claim 1, characterized in that: The first oil-filling chamber (26) comprises a left oil-filling chamber (27) and a right oil-filling chamber (28); the left oil-filling chamber (27) is located between the insulating support (8) and the jack end cover (13); the right oil-filling chamber (28) is located between the insulating support (8) and the insulating support tail end (9); and the insulating support (8) is provided with through holes (23, 24) communicating with the left oil-filling chamber (27) and the right oil-filling chamber (28).

3. The underwater pluggable electrical connector with a dual redundant sealing structure according to claim 2, characterized in that: The through hole connecting the left oil filling chamber (27) and the right oil filling chamber (28) comprises a central through hole (23) and a plurality of peripheral through holes (24) located around the central through hole (23).

4. The underwater pluggable electrical connector with a dual redundant sealing structure according to claim 3, characterized in that: The peripheral through hole (24) is an inclined through hole, and in the direction from the insulating support tail end (9) to the jack end cover (13), the distance between the peripheral through hole (24) and the central through hole (23) gradually decreases.

5. The underwater pluggable electrical connector with a dual redundant sealing structure according to claim 3, characterized in that: The end surface of the insulating support (8) located in the left oil-filled cavity (27) is an inner conical surface (25), and the lowest end of the inner conical surface (25) is located at the central through hole (23).

6. The underwater pluggable electrical connector with a dual redundant sealing structure according to claim 1, characterized in that: The jack end cover (13) is provided with an oil filling hole, and the oil filling hole is sealed by a first plug (19).

7. The underwater pluggable electrical connector with a dual redundant sealing structure according to claim 1, characterized in that: An elastic body pressing ring (33) is provided on the plug body (34), and the elastic body pressing ring (33) is used to adjust the degree of end face extrusion of the second radial seal (32).

8. The underwater pluggable electrical connector with a dual redundant sealing structure according to claim 1, characterized in that: A socket cap (36) is arranged in the socket body (34), the socket cap (36) is connected to the connecting body (37), a crown spring (35) is arranged in the socket cap (36), and the shuttle pin shaft (22) passes through the socket cap (36) and the crown spring (35).

9. The underwater pluggable electrical connector with a dual redundant sealing structure according to claim 1, characterized in that: The insulating support (8) is provided with an oil filling cavity (41) for filling oil into the socket battery core assembly (7), and the oil passage hole of the socket body (34) is located in the oil filling cavity (41).

10. The underwater pluggable electrical connector with a dual redundant sealing structure according to claim 9, characterized in that: The insulating support (8) is provided with a radial oil injection channel (42) communicating with the oil injection chamber (41), and the radial oil injection channel (42) is sealed by a second plug (43).

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