Watertight connector

Abstract

The invention relates to the technical field of connectors, and discloses a watertight connector, which comprises a plug of which the end part is fixedly provided with a first connector; one end of the socket can be connected with the end part, far away from the first connector, of the plug, and the other end is fixedly provided with a second connector; the plug and the socket are fixedly connected in a sealed and detachable manner through the connecting assembly; the first encapsulation sleeve is in threaded connection with the first connector, and glue can be injected from the end part, far away from the plug, of the first encapsulation sleeve; the second encapsulation sleeve is in threaded connection with the second connector, and glue can be injected from the end part, far away from the socket, of the second encapsulation sleeve; the two groups of first sealing rings are respectively sleeved on the first connector and the second connector; the pre-tightening assembly can automatically store force when the first filling sleeve and the first connector are tightened and apply force towards the connecting assembly to the first filling sleeve. According to the invention, the influence of vibration on the sealing effect can be greatly reduced, and the sealing effect is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of connector technology, and more specifically to a watertight connector. Background Technology

[0002] Watertight connectors are electrical connectors designed specifically for underwater or high-humidity environments. They possess extremely high waterproof and sealing performance and are widely used in fields such as marine exploration, underwater robots, ship communications, underwater lighting, and port equipment.

[0003] Currently, conventional watertight connectors mainly rely on O-ring seals and rubber sealing to maintain a tight seal. These two methods have the advantages of simple structure and ease of manufacturing and installation, but they still have certain drawbacks, namely:

[0004] Whether it's an O-ring seal or a rubber seal, both are pressed into a fixed position by a fixed preload (usually provided directly or indirectly by a nut). In this fixed position, the O-ring and rubber seal will undergo elastic deformation under the action of the preload to fit tightly against the sealing surface to achieve a seal. However, when the entire connector is working in deep water, if the water flow at the bottom causes movement, it will move the connector. This can easily cause the entire connector to vibrate, and the vibration can loosen the threaded connection, creating gaps at the sealing interface and leading to seal failure.

[0005] Therefore, this invention proposes a watertight connector with more reliable sealing performance. Summary of the Invention

[0006] In order to overcome the above-mentioned defects of the prior art, the present invention provides a watertight connector to solve the problems existing in the background art.

[0007] This invention provides the following technical solution: a watertight connector, comprising: a plug, with a first connector fixedly mounted at one end, and an external wire electrically connected to the first connector; a socket, one end of which can be connected to the end of the plug away from the first connector, and the other end of which is fixedly mounted with a second connector, and an external wire electrically connected to the second connector; a connecting assembly, which is installed between the plug and the socket, wherein the plug and the socket are sealed and detachably fixedly connected by the connecting assembly; a first potting sleeve, which is threadedly connected to the first connector, and adhesive can be injected from the end of the first potting sleeve away from the plug; a second potting sleeve, which is threadedly connected to the second connector, and adhesive can be injected from the end of the second potting sleeve away from the socket; two sets of first sealing rings, which are respectively fitted onto the first connector and the second connector; and a pre-tightening assembly, which automatically stores force when the first potting sleeve and the first connector are tightened, and applies a force toward the connecting assembly to the first potting sleeve.

[0008] Furthermore, the connecting assembly includes a first threaded sleeve and a second threaded sleeve. The first threaded sleeve is fixedly installed at the end of the plug away from the first connector, and the second threaded sleeve is fixedly installed at the end of the socket away from the second connector. The first threaded sleeve and the second threaded sleeve are threadedly connected.

[0009] Furthermore, a second sealing ring is installed on the threaded groove surface of the first threaded sleeve and the inner end face of the second threaded sleeve, and the second sealing ring will be pressed together when the threads of the first threaded sleeve and the second threaded sleeve are tightened.

[0010] Furthermore, the pre-tightening assembly includes a first connecting sleeve, a second connecting sleeve, a first pre-tightening sleeve, and a compression spring. The first connecting sleeve is slidably fitted onto the plug and can rotate synchronously with the plug. The second connecting sleeve is slidably fitted onto the first potting sleeve and can be fitted onto the first connecting sleeve and rotate synchronously with it. A combined component connects the first connecting sleeve and the second connecting sleeve, and the first connecting sleeve can drive the second connecting sleeve to move toward the plug through the combined component. The compression spring is located between the end of the first potting sleeve and the inner end face of the first connecting sleeve. When the first potting sleeve is tightened toward the first connector, the first potting sleeve will synchronously squeeze the compression spring. At the same time, the first connecting sleeve and the second connecting sleeve are connected and cover the compression spring. The first pre-tightening sleeve is threadedly installed on the first potting sleeve, and when the first pre-tightening sleeve moves toward the plug, it will drive the first potting sleeve to rotate in the direction of tightening with the first connector.

[0011] Furthermore, the threaded connection between the first pre-tightening sleeve and the first potting sleeve is not self-locking, and the second connecting sleeve can drive the first potting sleeve to move toward the plug through the first pre-tightening sleeve.

[0012] Furthermore, the assembly includes a first connecting plate and a second connecting plate. The first connecting plate is fixedly connected to the first connecting sleeve, and the second connecting plate is fixedly connected to the second connecting sleeve. Both the first and second connecting plates have through holes on their surfaces. A screw is inserted into the through hole, and a locking nut is threaded to the end of the screw. The first connecting plate can drive the second connecting plate to move towards the plug direction under the action of the screw and the locking nut.

[0013] Furthermore, the contact surfaces of the second connecting sleeve and the first pre-tightening sleeve are both uneven surfaces, and when the second connecting sleeve is tightly attached to the first pre-tightening sleeve, the first pre-tightening sleeve can only slide on the first potting sleeve and cannot rotate.

[0014] Furthermore, the pre-tightening assembly also includes a second pre-tightening sleeve and a transmission sleeve. The second pre-tightening sleeve is threadedly connected to the surface of the second potting sleeve, and the threaded connection between the second pre-tightening sleeve and the second potting sleeve is not self-locking. At the same time, when the second pre-tightening sleeve moves away from the socket, it will drive the second potting sleeve to rotate in the direction of tightening with the second connector. The transmission sleeve is slidably sleeved on the plug and can rotate synchronously with the plug. At the same time, one end of the transmission sleeve is in contact with the end of the first connecting sleeve, and the other end is in contact with the first pre-tightening sleeve.

[0015] Furthermore, the contact surfaces of the second pre-tightening sleeve and the transmission sleeve are both uneven surfaces, and when the transmission sleeve is tightly attached to the second pre-tightening sleeve, the second pre-tightening sleeve can only slide on the second potting sleeve and cannot rotate.

[0016] The technical effects and advantages of this invention are as follows:

[0017] This invention, by adding a pre-tightening component, can automatically accumulate force during connector installation and release it when a gap occurs at the seal within the connector, thereby eliminating the gap and significantly reducing the impact of vibration on the sealing effect, effectively improving the sealing performance. Furthermore, it can simultaneously adjust the sealing connection at both ends of the plug and socket to eliminate gaps, making the function more comprehensive. In addition, when eliminating gaps at the seals on the plug and socket, it simultaneously generates a force that allows the plug and socket to fit together, which strengthens the connection strength and increases the sealing pressure at the plug and socket connection, effectively improving the sealing performance of the plug-socket connection. Finally, when eliminating gaps at the seals, it can also simultaneously compress the solidified adhesive to increase the sealing between the adhesive and the cable, further improving the sealing performance and reducing the impact of vibration on the seal. Attached Figure Description

[0018] Figure 1 This is a first-view schematic diagram of the three-dimensional structure of the present invention;

[0019] Figure 2 This is a second-view schematic diagram of the three-dimensional structure of the present invention;

[0020] Figure 3 This is a schematic diagram of the internal structure of the present invention;

[0021] Figure 4 This is a schematic diagram of the split structure of the present invention.

[0022] The attached figures are labeled as follows: 1. Plug; 2. First connector; 3. Socket; 4. Second connector; 5. Connecting assembly; 501. First threaded sleeve; 502. Second threaded sleeve; 503. Second sealing ring; 6. First potting sleeve; 7. Second potting sleeve; 8. First sealing ring; 9. Pre-tightening assembly; 901. First connecting sleeve; 902. Second connecting sleeve; 903. First pre-tightening sleeve; 904. Compression spring; 905. Second pre-tightening sleeve; 906. Transmission sleeve; 10. Combined component; 1001. First connecting plate; 1002. Second connecting plate; 1003. Screw; 1004. Locking nut. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative and are not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Reference Figure 1-4 This invention provides a watertight connector, comprising: a plug 1, a socket 3, a connecting assembly 5, a first potting sleeve 6, a second potting sleeve 7, a first sealing ring 8, and a pre-tightening assembly 9. A first connector 2 is fixedly mounted on one end of the plug 1, and an external wire can be electrically connected to the first connector 2. One end of the socket 3 can be connected to the end of the plug 1 away from the first connector 2, and the other end is fixedly mounted with a second connector 4, and an external wire can be electrically connected to the second connector 4. The connecting assembly 5 is installed between the plug 1 and the socket 3, and the plug 1 and the socket 3 are connected by... The connecting assembly 5 provides a sealed and detachable fixed connection; the first potting sleeve 6 is threaded onto the first connector 2, and adhesive can be injected from the end of the first potting sleeve 6 away from the plug 1; the second potting sleeve 7 is threaded onto the second connector 4, and adhesive can be injected from the end of the second potting sleeve 7 away from the socket 3; there are two sets of first sealing rings 8, which are respectively fitted onto the first connector 2 and the second connector 4; the pre-tightening assembly 9 can automatically store force when the first potting sleeve 6 is tightened onto the first connector 2, and apply a force toward the connecting assembly 5 to the first potting sleeve 6.

[0025] In use, simply solder the cables to be connected to the contacts on the first connector 2 and the second connector 4 to achieve electrical connection. Then, tighten the first potting sleeve 6 and the second potting sleeve 7 onto the first connector 2 and the second connector 4 respectively. Inject glue into the ends of the first potting sleeve 6 and the second potting sleeve 7 to cover the ends of the cables connected to the plug 1 and the socket 3. Then, connect the plug 1 and the socket 3 through the connecting assembly 5. During this process, when the first potting sleeve 6 is tightened, it will automatically drive the pre-tightening assembly 9 to store force. Then, the pre-tightening assembly 9 will convert this force into a force that moves the first potting sleeve 6 toward the plug 1, thereby ensuring that the connection of the first potting sleeve 6 is tight. In this way, when the entire connector is subjected to vibration, there is always a force that drives the first potting sleeve 6 to press the first sealing ring 8, thereby effectively ensuring the sealing performance.

[0026] The connecting component 5 includes a first threaded sleeve 501 and a second threaded sleeve 502. The first threaded sleeve 501 is fixedly installed on the end of the plug 1 away from the first connector 2, and the second threaded sleeve 502 is fixedly installed on the end of the socket 3 away from the second connector 4. The first threaded sleeve 501 and the second threaded sleeve 502 can be threadedly connected. A second sealing ring 503 is installed on the threaded groove surface of the first threaded sleeve 501 and the inner end face of the second threaded sleeve 502. When the threads of the first threaded sleeve 501 and the second threaded sleeve 502 are tightened, the second sealing ring 503 will be pressed.

[0027] Thus, simply plug 1 and socket 3 into each other, and then tighten the first screw sleeve 501 and the second screw sleeve 502 to make them tighten together, so that the plug 1 and socket 3 can be connected. After the first screw sleeve 501 and the second screw sleeve 502 are tightened, the second sealing ring 503 will also be pressed to ensure the sealing of the connection between the plug 1 and socket 3.

[0028] The pre-tightening assembly 9 includes a first connecting sleeve 901, a second connecting sleeve 902, a first pre-tightening sleeve 903, and a compression spring 904. The first connecting sleeve 901 is slidably sleeved on the plug 1 and can rotate synchronously with the plug 1. The second connecting sleeve 902 is slidably sleeved on the first potting sleeve 6 and can be sleeved on the first connecting sleeve 901 and rotate synchronously with it. A combination component 10 connects the first connecting sleeve 901 and the second connecting sleeve 902, and the first connecting sleeve 901 can drive the second connecting sleeve 902 through the combination component 10. When sleeve 902 moves toward plug 1, compression spring 904 is located between the end of first potting sleeve 6 and the inner end face of first connecting sleeve 901. When first potting sleeve 6 is tightened toward first connector 2, first potting sleeve 6 will simultaneously compress compression spring 904. At the same time, after first connecting sleeve 901 and second connecting sleeve 902 are connected, they cover compression spring 904. First pre-tightening sleeve 903 is threaded on first potting sleeve 6. When first pre-tightening sleeve 903 moves toward plug 1, it will drive first potting sleeve 6 to rotate in the direction of tightening with first connector 2.

[0029] The threaded connection between the first pre-tightening sleeve 903 and the first potting sleeve 6 is not self-locking, and the second connecting sleeve 902 can drive the first potting sleeve 6 to move toward the plug 1 through the first pre-tightening sleeve 903.

[0030] The contact surfaces of the second connecting sleeve 902 and the first pre-tightening sleeve 903 are both uneven surfaces. When the second connecting sleeve 902 is in close contact with the first pre-tightening sleeve 903, the first pre-tightening sleeve 903 can only slide on the first potting sleeve 6 and cannot rotate.

[0031] Thus, during use, simply place the first connecting sleeve 901 onto the plug 1 (note that the plug 1 has a stepped surface, which will block the first connecting sleeve 901 from moving to its limit position after being placed on the plug 1), then place the compression spring 904 onto the plug 1, then thread the first pre-tightening sleeve 903 onto the first potting sleeve 6, and then tighten the first potting sleeve 6 to the first connector 2. After this, place the second connecting sleeve 902 onto the first potting sleeve 6, and connect the first connecting sleeve 901 and the second connecting sleeve 902 together using the assembly component 10. In this way, the first potting sleeve 6 and the first connector 2 are connected... During the tightening process of head 2, the compression spring 904 is simultaneously compressed. Since the first connecting sleeve 901 is blocked by the stepped surface on the plug 1, the compression spring 904 deforms and stores energy. Thus, when vibration causes a gap to form between the first potting sleeve 6 and the plug 1, the compression spring 904 can be released to push the first connecting sleeve 901 to move towards the plug 1. The first connecting sleeve 901 will drive the second connecting sleeve 902 to move, which in turn will drive the first pre-tightening sleeve 903 to move. The first pre-tightening sleeve 903 will drive the first potting sleeve 6 to move in the direction of tightening with the first connecting head 2, thereby compressing the first sealing ring 8 to eliminate the gap and restore the seal.

[0032] The assembly 10 includes a first connecting plate 1001 and a second connecting plate 1002. The first connecting plate 1001 is fixedly connected to the first connecting sleeve 901, and the second connecting plate 1002 is fixedly connected to the second connecting sleeve 902. Both the first connecting plate 1001 and the second connecting plate 1002 have through holes. A screw 1003 is inserted into the through hole. The end of the screw 1003 is threadedly connected to a locking nut 1004. The first connecting plate 1001 can drive the second connecting plate 1002 to move towards the plug 1 under the action of the screw 1003 and the locking nut 1004.

[0033] Thus, by simply passing the screw 1003 through the through holes on both the first connecting plate 1001 and the second connecting plate 1002, and then tightening the locking nut 1004 to the end of the screw 1003, the connection between the first connecting sleeve 901 and the second connecting sleeve 902 can be achieved.

[0034] In summary, during the entire usage process, firstly, the first potting sleeve 6 and the second potting sleeve 7 are respectively fitted onto the two sections of cables to be connected. Then, the ends of these two cable sections are soldered to the contacts of the first connector 2 and the second connector 4 to form an electrical connection. Next, the first connecting sleeve 901 is slidably fitted onto the plug 1, and then the compression spring 904 is fitted on. At this time, the first potting sleeve 6 and the second potting sleeve 7 are tightened onto the first connector 2 and the second connector 4, respectively. During the tightening process, the first potting sleeve 6 will simultaneously compress the compression spring 904 to store force. Then, the first pre-tightening sleeve 903 is screwed onto the first potting sleeve 6, and then the second connecting sleeve 902 is connected to the first connecting sleeve 901. By connecting the components together and ensuring that the inner end face of the second connecting sleeve 902 is in close contact with the end face of the first pre-tightening sleeve 903, when a gap is created between the first potting sleeve 6 and the first connector 2, the compression spring 904 will be released. This will push the first pre-tightening sleeve 903 to slide on the first potting sleeve 6 through the first connecting sleeve 901 and the second connecting sleeve 902. Since the first pre-tightening sleeve 903 is in close contact with the second connecting sleeve 902 and the first connecting sleeve 901 can only slide on the plug 1, the first pre-tightening sleeve 903 can only slide with the second connecting sleeve 902. This will drive the first potting sleeve 6 to rotate in the direction of tightening with the first connector 2 to eliminate the gap and effectively ensure sealing.

[0035] It should be noted that after the first connecting sleeve 901 is put on the plug 1, it needs to be blocked to ensure that there is a certain gap between it and the stepped surface on the plug 1. This can be done by first blocking it with a hard object, and then taking it out after the first potting sleeve 6 is tightened. At this time, since the first potting sleeve 6 is tightened, the first connecting sleeve 901 cannot drive the first potting sleeve 6 to move through the second connecting sleeve 902, so as to maintain the energy storage of the compression spring 904, and at the same time leave room for the first connecting sleeve 901 to move, so that the compression spring 904 can deform to release the force.

[0036] The above solution can only compensate for the gap at the first connector 2 on plug 1. It cannot accommodate the gap at the second connector 4 on socket 3. Therefore, further optimization is required:

[0037] The pre-tightening assembly 9 also includes a second pre-tightening sleeve 905 and a transmission sleeve 906. The second pre-tightening sleeve 905 is threadedly connected to the surface of the second potting sleeve 7, and the threaded connection between the second pre-tightening sleeve 905 and the second potting sleeve 7 is not self-locking. At the same time, when the second pre-tightening sleeve 905 moves away from the socket 3, it will drive the second potting sleeve 7 to rotate in the direction of tightening with the second connector 4. The transmission sleeve 906 is slidably sleeved on the plug 1 and can rotate synchronously with the plug 1. At the same time, one end of the transmission sleeve 906 is in contact with the end of the first connecting sleeve 901, and the other end is in contact with the first pre-tightening sleeve 903.

[0038] The contact surfaces of the second pre-tightening sleeve 905 and the transmission sleeve 906 are both uneven surfaces. When the transmission sleeve 906 is in close contact with the second pre-tightening sleeve 905, the second pre-tightening sleeve 905 can only slide on the second potting sleeve 7 and cannot rotate.

[0039] Thus, before the first connecting sleeve 901 is fitted into the plug 1, the transmission sleeve 906 is first fitted and pressed against the transmission sleeve 906 to create a gap between it and the upper stepped surface of the plug 1. After the first potting sleeve 6 is tightened, the resisting force is removed, and then the second pre-tightening sleeve 905 is rotated so that it is pressed tightly against the end of the transmission sleeve 906 away from the first connecting sleeve 901. In this way, when the compression spring 904 pushes the first connecting sleeve 901 to move towards the plug 1, it will simultaneously push the transmission sleeve 906 to move towards the plug 1. The transmission sleeve 906 will then push the second pre-tightening sleeve 905 to move away from the socket 3. This will drive the second potting sleeve 7 to rotate in the direction of tightening with the second connecting head 4, thereby eliminating the gap between the second potting sleeve 7 and the socket 3 and further improving the sealing performance.

[0040] In the above solution, the applicant found that the conductor between the first potting sleeve 6 and the second potting sleeve 7 is only sealed with solidified glue. However, in deep water environments, the glue and the insulation material on the cable surface are inconsistent, which may cause gaps due to temperature or pressure changes, leading to seal failure. Therefore, the applicant proposes to optimize the solution further.

[0041] The inner end face of the first potting sleeve 6 away from the first connector 2 is tapered, and the narrow end is away from the first connector 2. The inner end face of the second potting sleeve 7 away from the second connector 4 is tapered, and the narrow end is away from the second connector 4.

[0042] Thus, after the adhesive solidifies inside the first potting sleeve 6 and the second potting sleeve 7, it forms a conical solid. When the first potting sleeve 6 is tightened toward the first connector 2 and the second potting sleeve 7 is tightened toward the second connector 4, the conical inner end faces of the first potting sleeve 6 and the second potting sleeve 7 will squeeze the conical adhesive solid, thereby eliminating the gap between it and the cable insulation layer and further enhancing the sealing effect.

[0043] Finally, it should be noted that the accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can be referred to with ordinary designs. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A watertight connector, characterized in that, include: The plug (1) has a first connector (2) fixedly installed at its end, and the external wire can be electrically connected to the first connector (2); The socket (3) has one end that can be connected to the end of the plug (1) away from the first connector (2), and the other end is fixedly installed with a second connector (4). External wires can be electrically connected to the second connector (4). A connecting component (5) is installed between a plug (1) and a socket (3), wherein the plug (1) and the socket (3) are fixedly connected in a sealed and detachable manner by means of the connecting component (5); The first potting sleeve (6) is threaded onto the first connector (2), and adhesive can be injected from the end of the first potting sleeve (6) away from the plug (1); The second potting sleeve (7) is threaded onto the second connector (4), and adhesive can be injected from the end of the second potting sleeve (7) away from the socket (3); The first sealing ring (8) has two sets, which are respectively fitted on the first connector (2) and the second connector (4); The pre-tightening assembly (9) automatically stores force when the first potting sleeve (6) is tightened with the first connector (2) and applies a force toward the connecting assembly (5) to the first potting sleeve (6).

2. A watertight connector according to claim 1, characterized in that: The connecting assembly (5) includes a first threaded sleeve (501) and a second threaded sleeve (502). The first threaded sleeve (501) is fixedly installed on the end of the plug (1) away from the first connector (2), and the second threaded sleeve (502) is fixedly installed on the end of the socket (3) away from the second connector (4). The first threaded sleeve (501) and the second threaded sleeve (502) can be threadedly connected.

3. A watertight connector according to claim 2, characterized in that: The first threaded sleeve (501) has a second sealing ring (503) installed on the threaded groove surface of the first threaded sleeve (501) and the inner end face of the second threaded sleeve (502). When the threads of the first threaded sleeve (501) and the second threaded sleeve (502) are tightened, the second sealing ring (503) will be pressed.

4. A watertight connector according to claim 1, characterized in that: The pre-tightening assembly (9) includes a first connecting sleeve (901), a second connecting sleeve (902), a first pre-tightening sleeve (903), and a compression spring (904). The first connecting sleeve (901) is slidably sleeved on the plug (1) and can rotate synchronously with the plug (1). The second connecting sleeve (902) is slidably sleeved on the first potting sleeve (6) and can be sleeved on the first connecting sleeve (901) and rotate synchronously with it. A combination component (10) connects the first connecting sleeve (901) and the second connecting sleeve (902), and the first connecting sleeve (901) can drive the second connecting sleeve through the combination component (10). When the sleeve (902) moves toward the plug (1), the compression spring (904) is located between the end of the first potting sleeve (6) and the inner end face of the first connecting sleeve (901). When the first potting sleeve (6) is tightened toward the first connector (2), the first potting sleeve (6) will simultaneously squeeze the compression spring (904). At the same time, the first connecting sleeve (901) and the second connecting sleeve (902) are connected and cover the compression spring (904). The first pre-tightening sleeve (903) is threaded on the first potting sleeve (6). When the first pre-tightening sleeve (903) moves toward the plug (1), it will drive the first potting sleeve (6) to rotate in the direction of tightening with the first connector (2).

5. A watertight connector according to claim 4, characterized in that: The threaded connection between the first pre-tightening sleeve (903) and the first potting sleeve (6) is not self-locking, and the second connecting sleeve (902) can drive the first potting sleeve (6) to move toward the plug (1) through the first pre-tightening sleeve (903).

6. A watertight connector according to claim 4, characterized in that: The assembly (10) includes a first connecting plate (1001) and a second connecting plate (1002). The first connecting plate (1001) is fixedly connected to the first connecting sleeve (901), and the second connecting plate (1002) is fixedly connected to the second connecting sleeve (902). Both the first connecting plate (1001) and the second connecting plate (1002) have through holes on their surfaces. A screw (1003) is inserted into the through hole. A locking nut (1004) is threaded to the end of the screw (1003). The first connecting plate (1001) can drive the second connecting plate (1002) to move toward the plug (1) under the action of the screw (1003) and the locking nut (1004).

7. A watertight connector according to claim 4, characterized in that: The contact surfaces of the second connecting sleeve (902) and the first pre-tightening sleeve (903) are both uneven surfaces. When the second connecting sleeve (902) is in close contact with the first pre-tightening sleeve (903), the first pre-tightening sleeve (903) can only slide on the first potting sleeve (6) and cannot rotate.

8. A watertight connector according to claim 4, characterized in that: The pre-tightening assembly (9) also includes a second pre-tightening sleeve (905) and a transmission sleeve (906). The second pre-tightening sleeve (905) is threadedly connected to the surface of the second potting sleeve (7), and the threaded connection between the second pre-tightening sleeve (905) and the second potting sleeve (7) is not self-locking. At the same time, when the second pre-tightening sleeve (905) moves away from the socket (3), it will drive the second potting sleeve (7) to rotate in the direction of tightening with the second connector (4). The transmission sleeve (906) is slidably sleeved on the plug (1) and can rotate synchronously with the plug (1). At the same time, one end of the transmission sleeve (906) is in contact with the end of the first connecting sleeve (901), and the other end is in contact with the first pre-tightening sleeve (903).

9. A watertight connector according to claim 8, characterized in that: The contact surfaces of the second pre-tightening sleeve (905) and the transmission sleeve (906) are both uneven surfaces. When the transmission sleeve (906) is in close contact with the second pre-tightening sleeve (905), the second pre-tightening sleeve (905) can only slide on the second potting sleeve (7) and cannot rotate.

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