A nuclear-grade instrument connector assembly and a nuclear-grade instrument cable assembly with a plug

Abstract

The present invention relates to the field of electrical connector technology, and specifically to a nuclear-grade instrument connector assembly and a nuclear-grade instrument cable assembly with a plug. The nuclear-grade instrument cable assembly with a plug includes a cable having a core wire, a cable shielding layer and an outer sheath, a plug is provided at the front end of the cable, the plug includes a plug housing, a plug insulator is positioned and assembled in the plug housing, a plug contact is provided in the plug insulator, the front end of the plug contact is a plug-in end, and the rear end is conductively connected to the core wire, and the rear part of the plug housing is provided with an outer potting sealant wrapped outside the outer sheath of the cable by a potting process between the plug housing and the cable. In the nuclear-grade instrument cable assembly with a plug provided by the present invention, glue is poured between the cable and the plug housing to form an outer potting sealant, and the outer potting sealant can not only improve the sealing effect, but also effectively improve the sealing effect at the connection between the nuclear-grade instrument cable and the plug. Moreover, it can also form a support and positioning for the cable.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical connectors, and in particular to a nuclear-grade instrument connector assembly and a nuclear-grade instrument cable assembly with a plug. Background Art

[0002] As one of the basic electrical components, connectors are widely used for electrical connections between various devices and within devices. Connectors are used to connect and disconnect circuits through fitting / separation, and are the "bond" and "bridge" of system transmission. Connectors have different overall performance requirements depending on their different application scenarios. In general environments, the requirements for sealing, insulation, life and other performance are relatively low, while in harsh environments, the requirements are relatively high.

[0003] The utility model patent with the authorization announcement number CN207320436U discloses a high temperature resistant nuclear industry electrical connector, which includes a plug and a socket. The socket is a glass sintered gas-tight socket. The socket contact is fixedly assembled in the socket housing by glass sintering, and the plug is fixedly assembled with the corresponding end plug contact by the plug insulator. When assembling, the plug and the socket are sealed and plugged together. In addition, in order to improve the plug-in stability between the plug and the socket, a connecting nut is also provided on the plug housing.

[0004] When in use, the cable is connected to the corresponding plug, fixed with a cable tail clamp, and then the nut is rotated to clamp the tail clamp with the nut to achieve sealing of the cable. This sealing method has a simple structure, but its sealing effect is relatively poor, especially when it is used in harsh working conditions such as nuclear-grade environments. Therefore, it is necessary to design a new plug and cable sealing structure to ensure the normal operation of nuclear-grade instrument cables in harsh environments. Summary of the invention

[0005] The present invention provides a nuclear-grade instrument cable assembly with a plug to solve the technical problem in the prior art that the sealing between the cable and the plug is achieved only by relying on a tail clip and is not suitable for use in a harsh nuclear-grade environment; at the same time, the present invention also provides a nuclear-grade instrument cable connector assembly using the above-mentioned nuclear-grade instrument cable assembly.

[0006] The technical solution of a nuclear-grade instrument cable assembly with a plug provided by the present invention is as follows: A nuclear-grade instrument cable assembly with a plug, comprising a cable with a core wire, a cable shielding layer and an outer sheath, a plug being provided at the front end of the cable, the plug comprising a plug housing, a plug insulator being positioned and assembled in the plug housing, a plug contact being provided in the plug insulator, the front end of the plug contact being a plug-in end, and the rear end being conductively connected to the core wire, comprising a shielding ring, an outward-turned edge being provided at the front end of the shielding ring, an outer potting sealing colloid being formed by glue injection and wrapped outside the outer sheath of the cable being provided at the rear end of the plug housing between the plug housing and the cable, an annular protrusion being provided in the plug housing, which cooperates with the outward-turned edge stopper, the front end of the outer potting sealing colloid is pressed against the rear end of the shielding ring to limit the shielding ring, the rear end of the plug insulator cooperates with the annular protrusion stopper through the outward-turned edge, and the front end is limited by a retaining spring.

[0007] Beneficial effects of the present invention: In the nuclear-grade instrument cable assembly with a plug provided by the present invention, glue is poured between the cable and the plug housing to form an external potting sealant, which can not only improve the sealing effect, but also effectively improve the sealing effect of the connection between the nuclear-grade instrument cable and the plug. Moreover, it can also form a support and positioning for the cable.

[0008] The plug is further defined as follows: in the plug housing, an inner potting colloid is provided on the rear side of the plug insulator to form a fixed wrapping around the connection between the plug contact and the core wire; the inner potting colloid fixes the plug insulator, the plug contact and the front end of the cable together to form a plug core; the front end of the cable shielding layer is laid around the outer peripheral surface of the inner potting colloid; the plug housing is a metal housing that is conductively connected to the cable shielding layer. The inner potting colloid is used to solidify and position the plug insulator, the plug contact and the cable to form the plug core; the inner potting colloid can be used for shaping and assembly. Moreover, the cable shielding layer is laid on the inner potting colloid, and the inner potting colloid forms a support for the cable shielding layer, which can effectively ensure effective conductive contact between the plug housing and the cable shielding layer.

[0009] The plug insulator is further defined as a ceramic insulator positioned and assembled in the plug housing along the front-to-back direction. The use of the ceramic insulator can improve the performance of the entire cable assembly in a harsh environment and avoid the problems caused by the aging of the organic insulator.

[0010] The plug housing is further defined as comprising a front housing and a rear housing fixedly connected together by laser welding, the front housing is elastically sleeved with a housing connection nut, the rear end of the rear housing is provided with an external thread connection section, the cable is sleeved with a metal hose behind the plug housing, a connection sleeve assembly is provided at the front end of the metal hose, and the connection sleeve assembly is screwed onto the external thread connection section of the rear housing. The metal hose is used to further protect the cable, and at the same time, the external thread connection section provided at the rear end of the rear housing makes assembly and connection more convenient.

[0011] The technical solution of the nuclear-grade instrument connector assembly provided by the present invention is: a nuclear-grade instrument connector assembly, including a socket cable assembly with a socket, a nuclear-grade instrument cable assembly with a plug, and a connecting nut for fastening the plug and the socket together, the socket cable assembly includes the socket, the socket includes a socket shell, a socket contact is fixed in the socket shell by glass sintering, the nuclear-grade instrument cable assembly includes a cable with a core wire, a cable shielding layer and an outer sheath, the front end of the cable is provided with the plug, the plug includes a plug shell for sealing and mating with the socket shell, and a plug insulator is positioned and assembled in the plug shell A plug contact is provided in the plug insulator, the front end of the plug contact is a plug-in end plugged into the socket contact, and the rear end is conductively connected to the core wire. The cable assembly includes a shielding ring, and the front end of the shielding ring is provided with an outward turning edge. The rear part of the plug shell is provided with an outer potting sealing colloid wrapped outside the outer sheath of the cable between the plug shell and the cable. An annular protrusion is provided in the plug shell, which cooperates with the outward turning edge stopper. The front end of the outer potting sealing colloid is pressed against the rear end of the shielding ring to limit the shielding ring. The rear end of the plug insulator cooperates with the annular protrusion through the outward turning edge, and the front end is limited by a retaining spring.

[0012] The beneficial effect of the present invention is that in the cable assembly provided by the present invention, glue is poured between the cable and the plug housing to form an external potting sealant, which can not only improve the sealing effect, but also effectively improve the sealing effect of the connection between the nuclear-grade instrument cable and the plug. Moreover, it can also form a support and positioning for the cable.

[0013] The plug is further defined as follows: in the plug housing, an inner potting colloid is provided on the rear side of the plug insulator to form a fixed wrapping around the connection between the plug contact and the core wire; the inner potting colloid connects the plug insulator, the plug contact and the front end of the cable together to form a plug core; the front end of the cable shielding layer is laid around the outer peripheral surface of the inner potting colloid; the plug housing is a metal housing that is conductively connected to the cable shielding layer. The inner potting colloid is used to solidify and position the plug insulator, the plug contact and the cable to form the plug core; the inner potting colloid can be used for shaping and assembly. Moreover, the cable shielding layer is laid on the inner potting colloid, and the inner potting colloid forms a support for the cable shielding layer, which can effectively ensure effective conductive contact between the plug housing and the cable shielding layer.

[0014] The plug insulator is further defined as a ceramic insulator positioned and assembled in the plug housing along the front-to-back direction. The use of the ceramic insulator can improve the performance of the entire cable assembly in a harsh environment and avoid the problems caused by the aging of the organic insulator.

[0015] The plug housing is further defined as comprising a front housing and a rear housing fixedly connected together by laser welding, the front housing is elastically sleeved with a housing connection nut, the rear end of the rear housing is provided with an external thread connection section, the cable is sleeved with a metal hose behind the plug housing, a connection sleeve assembly is provided at the front end of the metal hose, and the connection sleeve assembly is screwed onto the external thread connection section of the rear housing. The metal hose is used to further protect the cable, and at the same time, the external thread connection section provided at the rear end of the rear housing makes assembly and connection more convenient.

[0016] The connection sleeve assembly is further defined as comprising a front connection sleeve and a rear connection sleeve which are plugged and assembled together, the front connection sleeve is screwed on the external threaded connection section at the rear of the rear shell, the rear connection sleeve is welded and connected to the front end of the metal hose, the connection sleeve assembly also comprises a connection sleeve connecting nut which fastens the front and rear connection sleeves together along the front and rear directions, one of the front connection sleeve and the rear connection sleeve is threadedly connected to the connection sleeve connecting nut, and the other is press-fitted with the connection sleeve connecting nut. The connection between the metal hose and the rear shell part is realized by using the front and rear connection sleeves and the connection sleeve connecting nut which are separately arranged, which is simple to assemble and convenient for maintenance and replacement.

[0017] The seal between the plug housing and the socket housing is further defined as follows: one of the plug housing and the socket housing is a male housing and the other is a female housing; the female housing has a socket for the male housing to be plugged in; the front end opening of the socket extends to the front end face of the female housing; a radial sealing ring is provided at the front end opening of the socket to seal with the outer circumference of the male housing; a stop flange is provided on the outer circumference of the male housing; a circumferential sealing ring is provided at the stop flange to form an end face seal with the front end face of the female housing. The sealing between the plug housing and the socket housing is achieved by using the circumferential sealing ring and the radial sealing ring, which can effectively improve the sealing effect. Moreover, by setting the radial sealing ring at the position of the socket opening, a gas expansion space as large as possible can be formed in the female housing, which can reduce the plugging resistance between the plug housing and the socket housing as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of a nuclear-grade instrument connector assembly provided by the present invention;

[0019] Figure 2 yes Figure 1 Enlarged view of the middle shielding ring and grounding spring;

[0020] Figure 3 yes Figure 1 Schematic diagram of the middle plug and connecting nut;

[0021] Figure 4 yes Figure 1 Exploded diagram of the middle socket;

[0022] Figure 5 It is a schematic diagram of a nuclear-grade instrument cable assembly with a plug provided by the present invention when it is not assembled;

[0023] Figure 6 yes Figure 5 is a schematic diagram of a shielding ring;

[0024] The names of the components corresponding to the corresponding reference numerals in the figure are: 100-plug; 200-socket; 300-shell connecting nut; 400-cable; 500-connection sleeve assembly; 600-metal hose; 11-first sealing ring; 12-second sealing ring; 13-plug insulator; 14-corrugated spring; 15-circlip; 16-plug front shell; 17-plug rear shell; 18-plug external thread section; 19-plug shell; 1 10-annular protrusion; 21-socket shell; 22-glass cake; 23-socket contact; 24-spiral slot; 211-socket rear shell; 212-socket front shell; 31-pin; 41-outer sheath; 42-cable shielding layer; 71-shielding ring; 711-outward turning edge; 72-inner potting colloid; 73-outer potting sealing colloid; 74-grounding spring; 51-front connecting sleeve; 52-connecting sleeve connecting nut; 53-rear connecting sleeve. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] An embodiment of the present invention is Figures 1 to 6 As shown, Figure 1 The nuclear-grade instrument connector assembly is shown, and the nuclear-grade instrument connector assembly includes a nuclear-grade instrument cable assembly with a plug and a socket cable assembly with a socket. The nuclear-grade instrument cable assembly with a plug includes a plug 100 and a cable 400, and the socket cable assembly with a socket includes a socket 200 and a nuclear-grade cable. The nuclear-grade instrument connector assembly includes a housing connection nut 300 that locks the plug 100 and the socket 200 when they are inserted into place.

[0027] like Figure 1 , Figure 2 and Figure 5As shown, the plug 100 and the socket 200 both have their respective front ends as the plug-in ends. The plug 100 includes a plug housing 19, and the plug housing 19 includes a plug front housing 16 and a plug rear housing 17. The plug front housing 16 and the plug rear housing 17 are laser welded and sealed together. The rear end of the plug rear housing 17 is provided with a tapered external thread to form a plug external thread section 18. The plug housing 19 is a cylindrical structure that is through from front to back. An annular protrusion 110 is provided in the plug front housing 16. The annular protrusion 110 is used to stop and cooperate with the rear side of the outward edge 711 on the shielding ring 71.

[0028] A connecting sleeve assembly 500 is screwed onto the plug external thread section 18. The structure of the connecting sleeve assembly 500 is as follows: Figure 1 As shown, the connecting sleeve assembly 500 includes a front connecting sleeve 51 threadedly assembled on the plug external thread section 18, and also includes a connecting sleeve connecting nut 52 threadedly connected to the front connecting sleeve 51. The connecting sleeve assembly 500 also includes a rear connecting sleeve 53, and the rear end of the connecting sleeve connecting nut 52 is stopped and matched with the rear connecting sleeve 53 to fasten the front connecting sleeve 51 and the rear connecting sleeve 53 together. A metal hose 600 is welded on the rear connecting sleeve 53. Of course, in other embodiments, the connecting sleeve connecting nut 52 can be threadedly assembled with the rear connecting sleeve 53, and stopped and assembled with the front connecting sleeve 51 in the front and rear directions.

[0029] like Figure 1 , Figure 2 and Figure 5 As shown, the nuclear-grade instrument cable assembly with a plug also includes a cable 400 inserted into the plug 100, the cable 400 includes an outer sheath 41, a cable shielding layer 42 and an internal core wire (not shown in the figure), and the front end of the cable 400 extends into the plug 100, wherein the cable shielding layer 42 protrudes from the outer sheath and is arranged forward, and the cable shielding layer 42 is radially supported by a shielding ring 71. The structure of the shielding ring 71 is shown in FIG. Figure 5 As shown, the shielding ring 71 is an annular structure as a whole, and an outward-turned edge 711 is provided at the front end, which is used to stop and cooperate with the annular protrusion 110. In this embodiment, the cable shielding layer 42 is welded inside the shielding ring 71. The front end of the shielding ring 71 is sleeved on the plug insulator 13, and stops and cooperates with the plug insulator 13 in the front and rear directions. The plug insulator 13 is actually a ceramic insulator, and a plug contact (not shown in the figure) is fixedly installed in the plug insulator 13. The rear end of the plug contact is used to be conductively connected to the core wire, and the front end is used to be plugged with the contact in the socket 200 to form a plug end.

[0030] The rear end of the plug insulator 13 is stopped by the annular protrusion 110 through the outward turning edge 711, and the front end is limited by the retaining spring 15. An internal potting colloid 72 is arranged at the rear of the plug insulator 13, and the internal potting colloid 72 is used to support the cable shielding layer 42. The internal potting colloid 72 fixes the plug insulator 13, the plug contact and the front end of the cable 400 to form a plug core. A groove is provided at a position corresponding to the shielding ring 71 on the plug housing 19, and a grounding spring 74 is fixedly attached in the groove. The shielding ring 71 is connected to the plug housing 19 through the grounding spring 74 to achieve grounding. In this embodiment, the grounding spring 74 is a finger-shaped spring leaf, and the finger-shaped spring leaf disclosed in the Chinese invention patent with the authorization announcement number CN2563785Y can be specifically referred to. In other embodiments, the grounding spring can be a beryllium copper spring leaf or an EMI spring leaf, etc.

[0031] The gap between the plug housing 19 and the outer sheath 41 is filled with an external potting sealant 73, and the front end of the external potting sealant 73 presses against the rear end of the shielding ring 71 to limit the shielding ring 71. The external potting sealant 73 is used to fix the cable 400 and seal the gap between the cable 400 and the plug housing 19.

[0032] The structure of the socket 200 is as follows Figure 1 and Figure 4 As shown, the socket 200 includes a socket housing 21, which includes a socket front housing 212 and a socket rear housing 211 that are sealed and assembled together by laser welding. A socket contact 23 is sintered and fixed in the socket front housing 212 by a glass cake 22. The front end of the socket contact 23 is used to be plugged in with the plug 100, and the rear end is used to connect the nuclear-grade wire.

[0033] like Figure 1 As shown, the housing connection nut 300 is mounted on the plug front housing 16, and a corrugated spring 14 is installed between the housing connection nut 300 and the outer edge of the plug front housing 16, so that the housing connection nut 300 is elastically mounted on the plug front housing 16, and a nail 31 is arranged in the housing connection nut 300. Figure 1 and Figure 4 As shown, a spiral groove 24 is provided on the socket housing 21 of the socket 200, and the staple 31 moves spirally in the spiral groove 24 to achieve the locking of the plug 100 and the socket 200. The spiral groove 24 and the staple 31 constitute a bayonet connection structure, which is the content of the prior art and will not be described in detail.

[0034] Depend on Figure 1 and Figure 5It can be seen that in this embodiment, the plug housing 19 is a male housing, and the socket housing 21 is a female housing. A stop flange is provided on the plug housing 19, and a second sealing ring 12 is mounted on the front side of the stop flange. The front end of the socket housing 21 has a plug hole, and a first sealing ring 11 is provided at the front end opening of the plug hole. When the plug housing 19 and the socket housing 21 are inserted into place, the first sealing ring 11 is radially squeezed between the plug housing 19 and the socket housing 21, and the second sealing ring 12 is axially squeezed between the stop flange of the plug housing 19 and the front end face of the socket housing 21. The first sealing ring 11 constitutes a radial sealing ring for circumferential sealing, and the second sealing ring 12 constitutes a circumferential sealing ring for end face sealing.

[0035] The assembly process of the present invention is as follows: first, the shielding ring 71 is mounted on the cable 400, and the outward edge 711 of the shielding ring 71 is located at the front side of the annular protrusion 110. The cable 400 is inserted into the plug housing 19 from back to front, and the core wire of the cable 400 is welded and fixed to the plug contact in the plug insulator 13 by welding. The inner potting colloid 72 is potted on the back side of the plug insulator 13 to form a fixed wrapping of the connection between the plug contact and the core wire. The inner potting colloid 72 connects the plug insulator 13, the plug contact and the front end of the cable to form a plug core. The cable shielding layer 42 in the cable 400 is laid forward and supported on the outside of the inner potting colloid 72, and the shielding ring 71 is pushed from back to front to be assembled and pressed on the outside of the cable shielding layer 42 and fixed by welding. Then, the entire plug core is pulled backward so that the outward edge 711 on the shielding ring 71 is blocked by the annular protrusion 110, and then the plug insulator 13 is limited in the front and rear directions by the retaining spring 15. Then, an outer potting sealant 73 is potted and molded between the outer sheath 41 and the plug housing 19 to complete the assembly of the nuclear-grade instrument cable assembly with a plug.

[0036] In this embodiment, Figure 5 It can be seen that the front part of the inner potting colloid 72 is a cylindrical structure, which is convenient for pushing the shielding ring 71 and can also ensure the matching assembly between the shielding ring 71 and the inner potting colloid 72. The radial dimension of the rear end of the inner potting colloid 72 is smaller than the radial dimension of the front end of the inner potting colloid 72, which facilitates the shielding ring 71 to be pushed from the back to the front.

[0037] In this embodiment, the outer potting sealing colloid 73 extends to the rear end of the shielding ring 71 to press the shielding ring 71 . In other embodiments, the outer potting sealing colloid 73 may not extend to this position.

[0038] In this embodiment, the grounding of the cable shielding layer 42 is achieved by relying on the grounding spring 74, and the grounding spring 74 constitutes a grounding member. In other embodiments, the grounding member can be other structures, such as a common grounding spring sheet, as long as it can be elastically pressed against the shielding ring. The portion of the grounding member that is in contact with the shielding ring constitutes an elastic contact portion.

[0039] In this embodiment, the plug housing 19 is formed by laser welding two parts, and may also be an integrated structure in other embodiments.

[0040] In this embodiment, the plug housing 19 and the socket housing 21 are both metal housings to achieve grounding.

[0041] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

[0042] The specific embodiment of the nuclear-grade instrument cable assembly with a plug of the present invention has a structure that is consistent with that in the above-mentioned embodiment, and its contents are not repeated here.

[0043] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A nuclear-grade instrument cable assembly with a plug, comprising a cable having a core wire, a cable shielding layer and an outer sheath, a plug being provided at the front end of the cable, the plug comprising a plug housing, a plug insulator being positioned and assembled in the plug housing, a plug contact being provided in the plug insulator, the front end of the plug contact being a plug-in end, and the rear end being conductively connected to the core wire, characterized in that: It includes a shielding ring, the front end of which is provided with an outward-turned edge, the rear part of the plug shell is provided with an outer potting sealing colloid wrapped outside the outer sheath of the cable by glue injection molding between the plug shell and the cable, an annular protrusion is provided in the plug shell, which cooperates with the outward-turned edge stopper, the front end of the outer potting sealing colloid is pressed against the rear end of the shielding ring to limit the shielding ring, the rear end of the plug insulator cooperates with the annular protrusion stopper through the outward-turned edge, and the front end is limited by a retaining spring.

2. The nuclear-grade instrument cable assembly with a plug according to claim 1, characterized in that: In the plug shell, an inner potting colloid is provided on the rear side of the plug insulator to form a fixed wrapping around the connection between the plug contact and the core wire. The inner potting colloid fixes the plug insulator, the plug contact and the front end of the cable together to form a plug core body. The front end of the cable shielding layer is laid around and on the outer peripheral surface of the inner potting colloid. The plug shell is a metal shell that is conductively connected to the cable shielding layer.

3. The nuclear-grade instrument cable assembly with a plug according to claim 2, characterized in that: The plug insulator is a ceramic insulator positioned and assembled in the plug housing along the front-rear direction.

4. The nuclear-grade instrument cable assembly with a plug according to claim 1, 2 or 3, characterized in that: The plug housing comprises a front housing and a rear housing fixedly connected together by laser welding, the front housing is elastically sleeved with a housing connecting nut, an externally threaded connecting section is arranged at the rear of the rear housing, a metal hose is sleeved on the cable behind the plug housing, a connecting sleeve assembly is arranged at the front end of the metal hose, and the connecting sleeve assembly is screwed onto the externally threaded connecting section of the rear housing.

5. A nuclear-grade instrument connector assembly, comprising a socket cable assembly with a socket, a nuclear-grade instrument cable assembly with a plug, and a connecting nut for fastening the plug and the socket together, the socket cable assembly comprising the socket, the socket comprising a socket housing, a socket contact being fixed in the socket housing by glass sintering, the nuclear-grade instrument cable assembly comprising a cable having a core wire, a cable shielding layer and an outer sheath, the front end of the cable being provided with the plug, the plug comprising a plug housing for sealingly mating with the socket housing, a plug insulator being positioned and assembled in the plug housing, a plug contact being provided in the plug insulator, the front end of the plug contact being a plug end for mating with the socket contact, and the rear end being conductively connected with the core wire, characterized in that: The cable assembly includes a shielding ring, the front end of which is provided with an outward-turned edge, the rear part of the plug shell is provided with an outer potting sealing colloid wrapped outside the outer sheath of the cable by glue injection molding between the plug shell and the cable, an annular protrusion is provided in the plug shell, which cooperates with the outward-turned edge stopper, the front end of the outer potting sealing colloid is pressed against the rear end of the shielding ring to limit the shielding ring, the rear end of the plug insulator cooperates with the annular protrusion stopper through the outward-turned edge, and the front end is limited by a retaining spring.

6. The nuclear-grade instrument connector assembly according to claim 5, characterized in that: In the plug shell, an inner potting colloid is provided on the rear side of the plug insulator to form a fixed wrapping around the connection between the plug contact and the core wire. The inner potting colloid fixes the plug insulator, the plug contact and the front end of the cable together to form a plug core body. The front end of the cable shielding layer is laid around and on the outer peripheral surface of the inner potting colloid. The plug shell is a metal shell that is conductively connected to the cable shielding layer.

7. The nuclear-grade instrument connector assembly according to claim 6, characterized in that: The plug insulator is a ceramic insulator positioned and assembled in the plug housing along the front-rear direction.

8. The nuclear-grade instrument connector assembly according to claim 5, 6 or 7, characterized in that: The plug housing comprises a front housing and a rear housing fixedly connected together by laser welding, the front housing is elastically sleeved with a housing connecting nut, an externally threaded connecting section is arranged at the rear of the rear housing, a metal hose is sleeved on the cable behind the plug housing, a connecting sleeve assembly is arranged at the front end of the metal hose, and the connecting sleeve assembly is screwed onto the externally threaded connecting section of the rear housing.

9. The nuclear-grade instrument connector assembly according to claim 8, characterized in that: The connecting sleeve assembly includes a front connecting sleeve and a rear connecting sleeve that are plugged together. The front connecting sleeve is screwed on the external threaded connecting section at the rear of the rear shell body, and the rear connecting sleeve is welded and connected to the front end of the metal hose. The connecting sleeve assembly also includes a connecting sleeve connecting nut that fastens the front and rear connecting sleeves together along the front and rear directions. One of the front connecting sleeve and the rear connecting sleeve is threadedly connected to the connecting sleeve connecting nut, and the other is press-fitted with the connecting sleeve connecting nut.

10. The nuclear-grade instrument connector assembly according to claim 5, 6 or 7, characterized in that: One of the plug housing and the socket housing is a male housing and the other is a female housing. The female housing has a socket for the male housing to be plugged into. The front end opening of the socket extends to the front end surface of the female housing. A radial sealing ring is provided at the front end opening of the socket to seal with the outer circumferential surface of the male housing. A stop flange is provided on the outer circumferential surface of the male housing, and a circumferential sealing ring is provided at the stop flange to form an end face seal with the front end surface of the female housing.

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