A waterproof electrical connector for 1E class nuclear power plants

Abstract

The application relates to a waterproof electric connector for a 1E-class nuclear power station, which comprises a plug and a socket, the plug comprises a plug shell, an insulator assembly, a socket assembly and a connecting nut, a first sealing ring is arranged between the socket assembly and the insulator assembly, a second sealing ring is arranged between the insulator assembly and the plug shell, a third sealing ring is arranged between the plug shell and the socket shell, and a core wire sealing assembly is arranged on the insulator assembly; the waterproof electric connector has the advantages that the plug has multiple sealing ways through the first sealing ring, the second sealing ring and the core wire sealing assembly, the waterproof performance of the plug is greatly improved, the plug can be directly used in a 100% humidity environment, or the plug can be normally docked by manually shaking and wiping the surface moisture after falling into water, the third sealing ring arranged between the plug shell and the socket shell can greatly improve the sealing performance when the plug shell and the socket shell are docked, and the influence of humidity on the electric connector is effectively reduced.

Description

Technical Field

[0001] This invention relates to a waterproof electrical connector for Class 1E nuclear power plants. Background Technology

[0002] The third-generation nuclear power plant 1E class rod control and position electrical connector is a product that can complete reactor emergency shutdown, containment isolation, core emergency cooling, reactor residual heat removal, reactor building heat removal, and prevent the release of radioactive materials into the surrounding area. It mainly serves as a signal connection for detectors and a control mechanism for drive mechanisms.

[0003] Existing electrical connectors are not capable of operating for extended periods under irradiation. Excessive irradiation can cause materials to become brittle and crack, severely impacting the overall performance of the connectors, such as their waterproofing. In the event of a severe nuclear power plant accident, the plant will be flooded with boric acid. Temperatures during severe nuclear accidents can reach 200°C, resulting in a significant increase in radiation dose. If the connectors cannot meet the waterproofing requirements under severe accident conditions, it could lead to nuclear power plant safety accidents or even nuclear leaks. Therefore, existing connectors are unsuitable for use in the rod control and positioning systems of third-generation nuclear power plants. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of existing electrical connectors being unable to operate for extended periods under continuous irradiation and high-temperature environments, and being waterproof. This invention proposes a Class 1E waterproof electrical connector for nuclear power plants. By adding a first sealing ring, a second sealing ring, a third sealing ring, and a core wire sealing assembly inside the plug, the electrical connector can meet the requirements for use in boric acid flooding environments under severe accident conditions in nuclear power plants.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: a waterproof electrical connector for a Class 1E nuclear power plant, comprising a plug and a socket. The plug includes a plug housing, an insulator assembly, a socket assembly, and a connecting nut. The socket assembly is disposed within the insulator assembly, which is disposed within the plug housing. The connecting nut is rotatably connected to the outer wall of the plug housing. The socket includes a socket housing, a glass insulator, and pins. A first sealing ring is provided between the socket assembly and the insulator assembly. A second sealing ring is provided between the insulator assembly and the plug housing. A third sealing ring is provided between the plug housing and the socket housing. A core wire sealing assembly is provided on the insulator assembly. An anti-loosening mechanism is provided between the connecting nut and the plug housing to prevent the connecting nut from turning back and loosening. The socket housing, the glass insulator, and the pins are integrally formed by glass sintering.

[0006] Preferably, the insulator assembly includes a socket insulator and a cover plate, and a connection structure is provided between the socket insulator and the cover plate. The connection structure includes a connecting post and a connecting hole, and the core wire sealing assembly is fixedly connected to the cover plate.

[0007] Preferably, the core wire sealing assembly includes a pressure plate, a screw, and a core wire sealing sleeve disposed on the pressure plate. The pressure plate has a through hole, and the cover plate has a nut or threaded hole that mates with the screw. The screw passes through the through hole and is fixedly connected in the nut or threaded hole. The core wire sealing sleeve is a phenyl silicone rubber sealing sleeve.

[0008] Preferably, the anti-loosening mechanism includes a locking ring and a wave spring ring. Both the locking ring and the wave spring ring are disposed on the outer side wall of the plug housing, and the wave spring ring is disposed between the locking ring and the plug housing. An engagement mechanism is provided between the locking ring and the connecting nut. The engagement mechanism includes a first sawtooth and a second sawtooth that mesh with each other. The first sawtooth is integrally formed on the locking ring, and the second sawtooth is integrally formed on the connecting nut.

[0009] Preferably, the outer wall of the plug housing is provided with a protruding pin to prevent the locking ring from retracting, and the locking ring is provided with a fixing hook that cooperates with the protruding pin. When the locking ring and the connecting nut are separated, the locking ring is fixed to the plug housing by the cooperation of the fixing hook and the protruding pin.

[0010] Preferably, the outer side wall of the plug housing is provided with a step, the inner side wall of the locking ring is provided with a boss, one end of the wave spring coil abuts against the step, and the other end of the wave spring coil abuts against the boss.

[0011] Preferably, a steel ball is provided between the connecting nut and the plug housing. The outer circumferential sidewall of the plug housing is provided with a placement ring groove for placing the steel ball. The inner sidewall of the connecting nut is provided with a fixing ring groove that mates with the placement ring groove. The connecting nut is provided with a placement hole. The steel ball is inserted into the placement ring groove and the fixing ring groove through the placement hole, and a pin is provided in the placement hole.

[0012] Preferably, the connecting nut is a T-nut, and the outer side wall of the connecting nut is provided with an anti-slip groove, and the outer side wall of the socket housing is provided with a T-shaped thread that mates with the T-nut.

[0013] Preferably, the plug further includes a plug tail cover and a cable sealing sleeve. The plug tail cover is disposed on the plug housing, and the cable sealing sleeve is disposed inside the plug tail cover. A tightening nut connected to the plug tail cover is fitted on the outer wall of the cable sealing sleeve. A sealing pressure sleeve is provided between the tightening nut and the cable sealing sleeve. An outer sleeve is provided on the outer wall of the tightening nut, and a fastener is provided between the outer sleeve and the tightening nut.

[0014] Preferably, the socket housing is provided with a first sealing gasket and a second sealing gasket, and the first sealing gasket and the second sealing gasket are located at both ends of the glass insulator. The first sealing gasket and the second sealing gasket are both phenyl silicone rubber sealing gaskets, and a flange is provided on the outer wall of the socket housing.

[0015] In summary, the advantages of this invention are as follows: By providing a first sealing ring between the socket assembly and the insulator assembly, a second sealing ring between the insulator assembly and the plug housing, and a core wire sealing assembly on the insulator assembly, the plug has multiple seals, greatly improving its waterproof performance. It can be used directly even in 100% humidity environments, or, if accidentally dropped into water, simply shaken dry and wiped to allow for normal connection. The third sealing ring between the plug housing and the socket housing significantly improves the sealing performance during connection, effectively reducing the impact of moisture on the connector. This allows the entire connector to meet the requirements for use in boric acid flooding environments under severe nuclear power plant accident conditions. Furthermore, by integrally molding the socket housing, glass insulator, and pins through glass sintering, the leakage rate of the socket at 1 atmosphere can meet the requirement of 1x10⁻⁶. -10 Pa.m 3 Because glass is an inorganic material, it possesses radiation resistance and can withstand temperatures up to 200℃, making it perfectly suitable for nuclear power environments. Finally, an anti-loosening mechanism is installed between the connecting nut and the plug housing to prevent the connecting nut from turning back and loosening. Even under vibration during use, it will not loosen, ensuring the stability of the electrical connector connection and thus the reliability of the circuit connection. It also effectively prevents thread loosening caused by impacts and temperature changes. It is capable of operating at 2–2000Hz, with an amplitude of 15mm and an acceleration of 1000m / s². 2 It ensures that there is no 1μs transient interruption, guaranteeing reliable connection of the electrical connector under conditions such as vibration, shock, temperature change, and liquid immersion. This enables the connected electrical connector to pass the conformity assessment of Class 1E cables and electrical plugs for nuclear power plants under the following conditions: 6.4.2 heat and radiation exposure under normal operating conditions and 6.4.3 irradiation under basic design events as specified in IEEE 383-2003 "Conformity Assessment Standard for Class 1E Cables and Electrical Plugs for Nuclear Power Plants", as well as the low temperature, high temperature, temperature change, vibration, shock, and water tests specified in GB / T 8993. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings:

[0017] Figure 1 This is a schematic diagram of the structure of a waterproof electrical connector for a Class 1E nuclear power plant according to the present invention;

[0018] Figure 2 This is a schematic diagram of the plug housing structure in this invention;

[0019] Figure 3 for Figure 2 A magnified view of part I;

[0020] Figure 4 This is a perspective view of the anti-loosening mechanism in this invention;

[0021] Figure 5 This is a schematic diagram of the anti-loosening mechanism installation in this invention;

[0022] Figure 6 This is a schematic diagram of the socket housing in this invention.

[0023] Figure label:

[0024] 1. Plug; 10. Plug housing; 101. Protruding pin; 102. Step; 11. Insulator assembly; 111. Socket insulator; 112. Cover plate; 113. Connecting post; 114. Connecting hole; 12. Socket assembly; 13. Connecting nut; 131. Placement hole; 132. Pin; 133. Anti-slip groove; 14. Plug tail cover; 15. Cable sealing sleeve; 16. Tightening nut; 17. Sealing sleeve; 18. Outer sleeve; 19. Fastener; 2. Socket; 21. Socket housing; 22. Glass insulator; 23. Pin; 24. T-thread; 25. First sealing gasket; 26. Second sealing gasket; 27. Flange; 3. First sealing ring; 4. Second sealing ring; 5. Third sealing ring; 6. Core wire sealing assembly; 61. Pressure plate; 62. Screw; 63. Core wire sealing sleeve; 64. Nut; 7. Anti-loosening mechanism; 71. Locking ring; 72. Wave spring ring; 73. First serration; 74. Second serration; 75. Fixing hook; 76. Boss; 8. Steel ball. Detailed Implementation

[0025] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, a waterproof electrical connector for a Class 1E nuclear power plant includes a plug 1 and a socket 2. The plug 1 includes a plug housing 10, an insulator assembly 11, a socket assembly 12, and a connecting nut 13. The socket assembly 12 is disposed within the insulator assembly 11, which is disposed within the plug housing 10. The connecting nut 13 is rotatably connected to the outer wall of the plug housing 10. The socket 2 includes a socket housing 21, a glass insulator 22, and pins 23. A first sealing ring 3 is provided between the socket assembly 12 and the insulator assembly 11, a second sealing ring 4 is provided between the insulator assembly 11 and the plug housing 10, and a third sealing ring 5 is provided between the plug housing 10 and the socket housing 21. In this embodiment, the first sealing ring is preferably placed on the socket assembly, the second sealing ring is placed on the insulator assembly, and the third sealing ring is placed on the plug housing. Moreover, the first sealing ring 3, the second sealing ring 4, and the third sealing ring 5 are all phenyl silicone rubber sealing rings. Since phenyl silicone rubber sealing rings can be used in continuous irradiation environments, long-term use at 150°C, and short-term use at 200°C, they avoid irreversible deterioration of the mechanical properties of the insulating material due to long-term cumulative excessive irradiation. The insulator assembly 11 is provided with a core wire sealing assembly 6. The connecting nut 13 and the plug housing 10 are provided with an anti-loosening mechanism 7 to prevent the connecting nut from turning back and loosening. The socket housing 21, the glass insulator 22, and the pin 23 are integrally formed by glass sintering.

[0026] By providing a first sealing ring 3 between the socket assembly 12 and the insulator assembly 11, a second sealing ring 4 between the insulator assembly 11 and the plug housing 10, and a core wire sealing assembly 6 on the insulator assembly 11, the plug has multiple seals, greatly improving its waterproof performance. It can be used directly even in 100% humidity environments, or, if accidentally dropped into water, simply shaken dry and wiped to allow for normal connection. The third sealing ring 5 between the plug housing 10 and the socket housing 21 significantly improves the sealing performance during connection, effectively reducing the impact of moisture on the connector. This allows the entire connector to meet the requirements for use in boric acid flooding environments under severe nuclear power plant accident conditions. Furthermore, by integrally molding the socket housing 21, glass insulator 22, and pins 23 through glass sintering, the leakage rate of the socket at 1 atmosphere can meet the requirement of 1x10⁻⁶. -10 Pa.m 3 / s, because glass is an inorganic material, it has radiation resistance and can withstand temperatures up to 200℃, making it perfectly suitable for nuclear power environments. Finally, an anti-loosening mechanism 7 is provided between the connecting nut 13 and the plug housing 10, thus preventing the connecting nut 13 from turning back and loosening. Even if subjected to vibration during use, it will not loosen, ensuring the stability of the electrical connector connection and thus the reliability of the circuit connection. It can also effectively prevent thread loosening caused by impact and temperature changes. It can operate at 2~2000Hz, amplitude 15mm, and acceleration 1000m / s². 2 It ensures that there is no 1μs transient interruption, guaranteeing reliable connection of the electrical connector under conditions such as vibration, shock, temperature change, and liquid immersion. This enables the connected electrical connector to pass the conformity assessment of Class 1E cables and electrical plugs for nuclear power plants under the following conditions: 6.4.2 heat and radiation exposure under normal operating conditions and 6.4.3 irradiation under basic design events as specified in IEEE 383-2003 "Conformity Assessment Standard for Class 1E Cables and Electrical Plugs for Nuclear Power Plants", as well as the low temperature, high temperature, temperature change, vibration, shock, and water tests specified in GB / T 8993.

[0027] The insulator assembly 11 includes a socket insulator 111 and a cover plate 112. Both the socket insulator 111 and the cover plate 112 are provided with a second sealing ring, and a connection structure is provided between the socket insulator 111 and the cover plate 112. The connection structure includes a connecting post 113 and a connecting hole 114. The core wire sealing assembly 6 is fixedly connected to the cover plate 112. In this embodiment, the plug housing 10 is provided with a pressure sleeve that abuts against the socket insulator 111, which can tightly fix the socket insulator 111 to the cover plate 112. Setting the insulator assembly 11 as a structure of socket insulator 111 and cover plate 112 is beneficial to the installation and fixation of the socket assembly 12. The fixation of the cover plate 112 and the socket insulator 111 through the connection structure can improve the overall installation quality. The core wire sealing assembly 6 includes a pressure plate 61, a screw 62, and a core wire sealing sleeve 63 disposed on the pressure plate 61. The pressure plate 61 has a through hole, and the cover plate 112 has a nut 64 or a threaded hole that mates with the screw 62. In this embodiment, a nut is preferred. The screw 62 passes through the through hole and is fixedly connected in the nut 64. The core wire sealing sleeve 63 is a phenyl silicone rubber sealing sleeve. The core wire sealing assembly 6 is configured as a pressure plate 61, a screw 62, and a core wire sealing sleeve 63. During installation, the wire is inserted into the core wire sealing sleeve 63 and connected to the socket assembly 12. The core wire sealing sleeve 63 seals the conductor. During installation, thread-locking adhesive is applied to the screw 62, which is then passed through the through hole and screwed into the nut. This reduces the loosening of the screw 62 and improves the fixing quality of the pressure plate 61. The nut or threaded hole allows for quick installation and fixing of the screw 62. Since the phenyl silicone rubber sealing ring can be used in continuous irradiation environments, long-term use at 150°C, and short-term use at 200°C, the core wire sealing sleeve 63 in this embodiment uses a phenyl silicone rubber sealing sleeve to avoid irreversible deterioration of the mechanical properties of the insulating material due to long-term accumulation of excessive irradiation.

[0028] The anti-loosening mechanism 7 includes a locking ring 71 and a wave spring coil 72. Both the locking ring 71 and the wave spring coil 72 are sleeved on the outer wall of the plug housing 10, with the wave spring coil 72 positioned between the locking ring 71 and the plug housing 10. An engagement mechanism is provided between the locking ring 71 and the connecting nut 13. By configuring the anti-loosening mechanism 7 with a structure of a locking ring 71 and a wave spring coil 72, the engagement mechanism between the locking ring 71 and the connecting nut 13 effectively prevents the connecting nut 13 from loosening due to reverse rotation. Furthermore, the locking ring 71 is always subjected to the elastic force of the wave spring coil 72, which improves the stability of the engagement mechanism. The engagement mechanism includes a first serration 73 and a second serration 74 that mesh with each other. The first saw tooth 73 is integrally formed on the locking ring 71, and the second saw tooth 74 is integrally formed on the connecting nut 13. The meshing mechanism is set up with the first saw tooth 73 and the second saw tooth 74 meshing with each other. The meshing is compact and easy to process. Integrating the first saw tooth 73 into the locking ring 71 can improve the connection strength between the first saw tooth 73 and the locking ring 71 and also simplify the installation process between the first saw tooth 73 and the locking ring 71. Similarly, integrating the second saw tooth 74 into the connecting nut 13 can improve the connection strength between the second saw tooth 74 and the connecting nut 13 and also simplify the installation process between the second saw tooth 74 and the connecting nut 13, which greatly improves the meshing quality of the first saw tooth 73 and the second saw tooth 74.

[0029] The outer wall of the plug housing 10 is provided with a protruding pin 101 to prevent the locking ring 71 from retracting. This prevents the locking ring 71 from retracting and ensures the meshing quality of the first sawtooth 73 and the second sawtooth 74. In this embodiment, the protruding pin 101 is threadedly fixed to the outer wall of the plug housing 10. The locking ring 71 is provided with a fixing hook 75 that cooperates with the protruding pin 101. When the locking ring 71 and the connecting nut 13 are separated, the locking ring 71 is fixed to the plug housing 10 through the cooperation of the fixing hook 75 and the protruding pin 101. When the electrical connector plug is connected to the electrical connector socket, the locking ring 71 is pulled back so that the fixing hook 75 on the locking ring 71 hooks the protruding pin 101. 01. Separate the locking ring 71 and the connecting nut 13. After the electrical connector plug and electrical connector socket are inserted, rotate the connecting nut 13 to connect them together. After the connection is in place, pull the locking ring 71 back and rotate it clockwise. When the fixing hook 75 disengages from the protruding pin 101, the locking ring 71 is automatically pushed forward by the elastic force of the wave spring coil 72, so that the first sawtooth 73 and the second sawtooth 74 engage. At the same time, the protruding pin 101 blocks the locking ring 71, so that the locking ring 71 cannot rotate in any direction. Because the wave spring force is very large, the locking ring 71 and the connecting nut 13 are engaged together, and the connecting nut 13 cannot rotate in any direction, thus playing a role in preventing loosening.

[0030] The outer side wall of the plug housing 10 is provided with a step 102, and the inner side wall of the locking ring 71 is provided with a boss 76. One end of the wave spring coil 72 abuts against the step 102, and the other end of the wave spring coil 72 abuts against the boss 76. This enables the wave spring coil 72 to be installed and fixed, ensuring the stability of the wave spring coil 72 during operation. In this embodiment, the step 102 and the plug housing 10 are an integral structure, and the boss 76 and the locking ring 71 are an integral structure, which can greatly improve the connection strength between the step 102 and the plug housing 10, as well as the connection strength between the boss 76 and the locking ring 71.

[0031] A steel ball 8 is provided between the connecting nut 13 and the plug housing 10. The outer circumferential sidewall of the plug housing 10 has a groove for placing the steel ball 8. The inner sidewall of the connecting nut 13 has a fixing groove that mates with the groove for placing ... Mirror polishing of the surface greatly improves the aesthetics of the entire plug housing 10 and conceals the connector installation process, ensuring that the connecting nut 13 can rotate smoothly at the bearing level. In this embodiment, 25 steel balls 8 are used. During installation, after the fixing ring groove and the placement ring groove are aligned, 25 steel balls 8 are sequentially placed between the placement ring groove and the fixing ring groove through the placement hole 131. Then, the placement hole 131 is sealed with a pin 132, and the pin 132 is fixed to the connecting nut 13 by laser welding. Mirror polishing is performed at the welding position to enhance the aesthetics of the connector and conceal the connector installation process, ensuring that the connecting nut 13 can rotate smoothly at the bearing level.

[0032] The connecting nut 13 is a T-nut, and the outer side wall of the connecting nut 13 is provided with an anti-slip groove 133. The outer side wall of the socket housing 21 is provided with a T-shaped thread 24 that mates with the T-nut. The T-nut and the T-shaped thread 24 not only improve the fixing quality between the connecting nut 13 and the socket housing 21 and prevent the connecting nut 13 from loosening, but also ensure the smooth connection between the connecting nut 13 and the socket housing 21. In addition, the anti-slip groove 133 can play an anti-slip role when plugging and unplugging, making it easy to disconnect the plug and socket after connection.

[0033] The plug also includes a plug tail cover 14 and a cable sealing sleeve 15. The plug tail cover 14 is disposed on the plug housing 10, and the cable sealing sleeve 15 is disposed inside the plug tail cover 14. By replacing different cable sealing sleeves 15, all finished cables can be sealed and clamped at the tail attachment, preventing single conductors in the finished cable from loosening due to stress at the crimping point with the socket. The armor braided layer forms a shielding treatment through crimping. A tightening nut 16 connected to the plug tail cover 14 is fitted on the outer wall of the cable sealing sleeve 15. A sealing sleeve 17 is provided between the female connector 16 and the cable sealing sleeve 15. An outer sleeve 18 is provided on the outer wall of the tightening nut 16. A fastener 19 is provided between the outer sleeve 18 and the tightening nut 16. In this embodiment, the fastener 19 is fastened to the tightening nut 16 by a hydraulic fastening tool, so that the cable and connector have the purpose of tension resistance and anti-drag. Finally, the outer sleeve 18 is screwed into the tightening nut 16 and riveted to fix the outer sleeve 18 to the tightening nut 16, which enhances the aesthetics and anti-disassembly of the entire plug and also prevents the outer sleeve 18 from loosening.

[0034] The socket housing 21 is provided with a first sealing gasket 25 and a second sealing gasket 26, which are located at both ends of the glass insulator 22. Both the first sealing gasket 25 and the second sealing gasket 26 are phenyl silicone rubber sealing gaskets. A flange 27 is provided on the outer wall of the socket housing 21. In order to enable the second sealing gasket 26 to withstand a large amount of compression and to prevent irreversible deterioration of the sealing gasket due to a large amount of compression, the second sealing gasket 26 in this embodiment is a non-standard sealing gasket. The second sealing gasket 26 is disposed between the socket housing 21 and the plug housing 22. On the 0-connection side, the second sealing gasket 26 ensures a sealing pressure greater than 1 MPa when the plug and socket are connected. The first sealing gasket 25 serves to prevent moisture and enhance electrical performance. Furthermore, both the first and second sealing gaskets 25 and 26 are made of phenyl silicone rubber, allowing for long-term use at 150°C and short-term use at 200°C under continuous irradiation. This avoids irreversible deterioration of the mechanical properties of the insulating material due to long-term cumulative excessive irradiation. The flange 27 is used for on-site installation of the entire electrical connector, achieving a stable connection with the junction box.

[0035] The above description is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the patent scope of the present invention.

Claims

1. A waterproof electrical connector for a Class 1E nuclear power plant, comprising a plug and a socket, wherein the plug comprises a plug housing, an insulator assembly, a socket assembly, and a connecting nut, the socket assembly being disposed within the insulator assembly, the insulator assembly being disposed within the plug housing, and the connecting nut being rotatably connected to the outer wall of the plug housing; the socket comprises a socket housing, a glass insulator, and pins, characterized in that: A first sealing ring is provided between the socket assembly and the insulator assembly, a second sealing ring is provided between the insulator assembly and the plug housing, a third sealing ring is provided between the plug housing and the socket housing, a core wire sealing assembly is provided on the insulator assembly, an anti-loosening mechanism is provided between the connecting nut and the plug housing to prevent the connecting nut from turning loose, and the socket housing, glass insulator and pin are integrally formed by glass sintering.

2. The waterproof electrical connector for a Class 1E nuclear power plant according to claim 1, characterized in that: The insulator assembly includes a socket insulator and a cover plate, and a connection structure is provided between the socket insulator and the cover plate. The connection structure includes a connecting post and a connecting hole, and the core wire sealing assembly is fixedly connected to the cover plate.

3. A waterproof electrical connector for a Class 1E nuclear power plant according to claim 2, characterized in that: The core wire sealing assembly includes a pressure plate, a screw, and a core wire sealing sleeve disposed on the pressure plate. The pressure plate has a through hole, and the cover plate has a nut or threaded hole that mates with the screw. The screw passes through the through hole and is fixedly connected in the nut or threaded hole. The core wire sealing sleeve is a phenyl silicone rubber sealing sleeve.

4. A waterproof electrical connector for a Class 1E nuclear power plant according to claim 1, characterized in that: The anti-loosening mechanism includes a locking ring and a wave spring ring. Both the locking ring and the wave spring ring are located on the outer side wall of the plug housing, and the wave spring ring is located between the locking ring and the plug housing. An engagement mechanism is provided between the locking ring and the connecting nut. The engagement mechanism includes a first sawtooth and a second sawtooth that mesh with each other. The first sawtooth is integrally formed on the locking ring, and the second sawtooth is integrally formed on the connecting nut.

5. A waterproof electrical connector for a Class 1E nuclear power plant according to claim 4, characterized in that: The outer wall of the plug housing is provided with a protruding pin to prevent the locking ring from retracting. The locking ring is provided with a fixing hook that cooperates with the protruding pin. When the locking ring and the connecting nut are separated, the locking ring is fixed to the plug housing by the cooperation of the fixing hook and the protruding pin.

6. A waterproof electrical connector for a Class 1E nuclear power plant according to claim 4, characterized in that: The outer side wall of the plug housing is provided with a step, the inner side wall of the locking ring is provided with a boss, one end of the wave spring coil abuts against the step, and the other end of the wave spring coil abuts against the boss.

7. A waterproof electrical connector for a Class 1E nuclear power plant according to claim 1, characterized in that: A steel ball is provided between the connecting nut and the plug housing. The outer circumferential side wall of the plug housing is provided with a placement ring groove for placing the steel ball. The inner side wall of the connecting nut is provided with a fixing ring groove that mates with the placement ring groove. The connecting nut is provided with a placement hole. The steel ball is inserted into the placement ring groove and the fixing ring groove through the placement hole, and a pin is provided in the placement hole.

8. A waterproof electrical connector for a Class 1E nuclear power plant according to claim 1, characterized in that: The connecting nut is a T-nut, and the outer side wall of the connecting nut is provided with an anti-slip groove. The outer side wall of the socket housing is provided with a T-shaped thread that mates with the T-nut.

9. A waterproof electrical connector for a Class 1E nuclear power plant according to claim 1, characterized in that: The plug also includes a plug tail cover and a cable sealing sleeve. The plug tail cover is disposed on the plug housing, and the cable sealing sleeve is disposed inside the plug tail cover. A tightening nut connected to the plug tail cover is fitted on the outer wall of the cable sealing sleeve. A sealing pressure sleeve is provided between the tightening nut and the cable sealing sleeve. An outer sleeve is provided on the outer wall of the tightening nut, and a fastener is provided between the outer sleeve and the tightening nut.

10. A waterproof electrical connector for a Class 1E nuclear power plant according to claim 1, characterized in that: The socket housing is provided with a first sealing gasket and a second sealing gasket, and the first sealing gasket and the second sealing gasket are located at both ends of the glass insulator. Both the first sealing gasket and the second sealing gasket are phenyl silicone rubber sealing gaskets. A flange is provided on the outer wall of the socket housing.

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