CN211980986U

CN211980986U - Plug cable assembly

Info

Publication number: CN211980986U
Application number: CN202020606446.XU
Authority: CN
Inventors: 邵明坤; 陈�峰; 秦海强; 姚旭栋; 谢晶晶; 江浪
Original assignee: China Aviation Optical Electrical Technology Co Ltd
Current assignee: China Aviation Optical Electrical Technology Co Ltd; Shanghai Nuclear Engineering Research and Design Institute Co Ltd
Priority date: 2020-04-21
Filing date: 2020-04-21
Publication date: 2020-11-20
Anticipated expiration: 2030-04-21

Abstract

The utility model relates to a plug cable assembly, which comprises a plug and a cable, wherein the tail part of a plug shell and the cable extending out of the plug shell are coated on the periphery of the plug shell through the front end, and the rear end is coated on a double-wall heat-shrinkable tube on a cable sheath to realize sealing; a metal hose is sleeved on the cable behind the double-wall heat shrinkable tube, and a front end connector of the metal hose is connected with the plug shell through an adapter fitting sleeved outside the double-wall heat shrinkable tube; the adapter accessory comprises a cylindrical structure and an NPT joint, wherein the cylindrical structure is formed by buckling an upper cover plate and a lower cover plate, the front end of the cylindrical structure is in axial stop fit with the plug shell and is prevented from rotating in the circumferential direction, and the NPT joint is in axial stop fit with the rear end of the cylindrical structure and is prevented from rotating in the circumferential direction; the NPT thread section at the tail part of the NPT joint is connected with the internal thread of the front end joint of the metal hose in a matching way.

Description

Plug cable assembly

Technical Field

The utility model relates to an electric connector technical field, concretely relates to plug cable subassembly.

Background

The cable assembly is generally used for power supply and signal transmission between electrical equipment systems, is connected and separated through a connector, realizes communication and short circuit of an electrical circuit, plays a role of a bridge in the whole electrical system, and belongs to an indispensable basic component. Cable assemblies are often the frequent source of electrical faults, and their reliability often concerns the stability of the overall system. In some fields with extremely harsh application environments, such as petroleum, petrochemical industry, nuclear power, aviation, aerospace and the like, the requirement on the reliability of the cable assembly is more strict. On one hand, the cable assembly usually experiences severe environments such as high temperature, high humidity, high pressure, radiation and the like for a long time, and on the other hand, the cable assembly is required to have high service life and safe and reliable electrical performance.

Among many electrical performance indexes, insulation resistance is the most critical, and the lower insulation resistance of a cable assembly often means that electrical faults of equipment occur, such as short circuit, false alarm, electrical breakdown and the like. The insulation resistance is greatly affected by the surrounding environment, and the cable assembly is required to have good sealing performance. The cable assembly sealing part is usually made of organic non-metallic materials, and the materials are exposed in the surrounding environment for a long time and are inevitably influenced by factors such as light, heat, water vapor, irradiation and the like in the environment to gradually age and even lose the sealing performance, so that the cable assembly fails. Therefore, in some fields with extremely severe environmental conditions, the long-term reliable sealing performance of the cable assembly is very important.

Disclosure of Invention

In order to solve the problem, the utility model provides a plug cable subassembly of novel structure makes it seal through sealing up through the double-walled pyrocondensation pipe between plug afterbody casing and cable to the switching annex of connection and double-walled pyrocondensation pipe protection between plug casing and the afterbody annex is realized simultaneously in the setting, realizes plug cable subassembly's reliable sealing for a long time.

The purpose of the utility model and the technical problem thereof are realized by adopting the following technical scheme. According to the utility model, the plug cable assembly comprises a plug and a cable, the tail part of a plug shell and the cable extending out of the plug shell are coated on the periphery of the plug shell through the front end, and the rear end is coated on a double-wall heat-shrinkable tube on a cable sheath to realize sealing; a metal hose is sleeved on the cable behind the double-wall heat shrinkable tube, and a front end connector of the metal hose is connected with the plug shell through an adapter fitting sleeved outside the double-wall heat shrinkable tube; the adapter accessory comprises a cylindrical structure and an NPT joint, wherein the cylindrical structure is formed by buckling an upper cover plate and a lower cover plate, the front end of the cylindrical structure is in axial stop fit with the plug shell and is prevented from rotating in the circumferential direction, and the NPT joint is in axial stop fit with the rear end of the cylindrical structure and is prevented from rotating in the circumferential direction; the NPT thread section at the tail part of the NPT joint is connected with the internal thread of the front end joint of the metal hose in a matching way.

The purpose of the utility model and the technical problem thereof can be further realized by adopting the following technical measures.

In the plug cable assembly, the upper cover plate and the lower cover plate are respectively matched with the plug shell and the corresponding annular bulge/groove at the periphery of the NPT joint through the limiting grooves/limiting blocks at the front end and the rear end to realize axial stop and limiting.

In the plug cable assembly, the upper cover plate and the lower cover plate are circumferentially locked by matching a plurality of protrusions/grooves in the front end and the rear end with corresponding grooves/protrusions on the periphery of the plug shell and the NPT joint.

In the plug cable assembly, the upper cover plate, the lower cover plate, the plug shell and the NPT joint are in concave-convex fit to realize that the axial stop limiting concave-convex part is of a polygonal structure, and circumferential rotation stopping is realized simultaneously through concave-convex fit of the polygonal structure.

In the plug cable assembly, the upper cover plate and the lower cover plate realize axial stop and limit through the inner limit grooves and the plug shell/and the NPT joint peripheral annular bulge, and the upper cover plate and the lower cover plate are also provided with the rotation stopping screws of which the end surfaces are tightly pressed in the corresponding planes or grooves on the annular bulge to realize circumferential rotation stopping.

In the plug cable assembly, the upper cover plate and the lower cover plate are circumferentially locked by matching the polygonal limiting block structures inside the upper cover plate and the corresponding polygonal protrusions on the periphery of the plug shell and/or the NPT joint, and are axially locked and limited by matching the rotation-locking screws penetrating through the upper cover plate and the polygonal protrusions.

In the plug cable assembly, the two abutting surfaces of the upper cover plate and the lower cover plate are respectively provided with the convex groove and the groove matched with the convex groove, so that the upper cover plate and the lower cover plate can form a closed space through the matching of the convex groove and the groove to prevent surplus objects generated by long-term aging of non-metallic materials such as a cable outer sheath, a heat shrink tube and the like from falling into a nuclear power plant.

In the plug cable assembly, the upper cover plate and the lower cover plate are of hollow structures so as to meet the requirements of light weight, high strength and good vibration resistance.

In the plug cable assembly, the upper cover plate and the lower cover plate are provided with the threaded holes and the corresponding matching holes for fixedly connecting the upper cover plate and the lower cover plate, and the combined screws sleeved with the spring washers sequentially penetrate through the matching holes and the threaded holes to realize press-fitting fixation of the upper cover plate and the lower cover plate.

In the plug cable assembly, an inner potting adhesive fixedly wrapping the joint of the plug contact element and the core wire is potted in the plug housing, and an outer potting adhesive wrapping the outer sheath of the cable is potted between the plug housing and the nuclear instrument cable in the plug housing.

Compared with the prior art, the utility model obvious advantage and beneficial effect have. Borrow by above-mentioned technical scheme, the utility model discloses plug cable subassembly can reach comparable technical advancement and practicality to have the industrial wide use value, it has following advantage at least: the utility model discloses the material of plug cable subassembly adopts resistant irradiation, high temperature resistant, resistant irradiation material, and the plug is inside to realize sealedly with the cable through the casting glue, and the outside is realized and the secondary seal between the cable through double-walled pyrocondensation pipe, and afterbody NPT screwed joint switching bellows carries out mechanical protection. The utility model discloses plug cable subassembly has excellent high temperature resistant, anti-irradiation, performance such as long-life, is applicable to extremely harsh environment.

The utility model discloses plug cable subassembly still is equipped with one kind and realizes the switching annex of switching between double-walled pyrocondensation pipe protection and plug housing and the bellows simultaneously, and this switching annex has characteristics such as spline, locking, anticreep, has high strength and good shock resistance. The adapter can also be closed through a ring, and can prevent the redundant objects generated by long-term aging of the internal organic materials from falling off, so that the use requirement of the environment with higher cleanliness can be met, and the light connection requirement can be met by adopting a hollow open structure.

The utility model discloses a main component part that components of a whole that can function independently buckled structure is as adapter coupling has installation convenient to use, the suitability is strong and simple structure's characteristics, and this adapter coupling's setting makes the afterbody cable realize being connected with plug housing through the great metal mechanical structure of its external strength, this kind of reliable connection can drive the removal of cable in the annex through the metal accessories of its afterbody when making the removal plug, avoid the direct atress of dragging between plug and the cable, thereby influence the life of being connected reliability and cable between cable and the plug.

Drawings

Fig. 1 is a schematic view of the overall structure of the plug cable assembly of the present invention;

FIG. 2 is an exploded view of the adaptor fitting of the plug cable assembly of the present invention;

FIG. 3 is a cross-sectional view of a plug cable assembly adapter according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of an adapter cover plate of a plug cable assembly according to an embodiment of the present invention;

FIG. 5 is an exploded view of another embodiment plug cable assembly adapter of the present invention;

FIG. 6 is a cross-sectional view of another embodiment plug cable assembly adapter of the present invention;

fig. 7 is a schematic view of another embodiment of an adaptor cover for a plug cable assembly according to the present invention.

[ description of main element symbols ]

1: plug shell

2: nuclear instrument cable

3: double-wall heat-shrinkable tube

4: upper cover plate

5: lower cover plate

6: NPT joint

7: front connecting sleeve

8: connecting nut

9: rear connecting sleeve

10: rotation stopping screw

11: front plug

12: plug rear shell

13: convex groove

14: groove

15: rotation stopping flat

16: rotation-stopping threaded hole

17: limiting groove

18: combined screw

19: spring washer

20: locating block

21: metal hose

22: annular protrusion

23: locating slot

24: NPT thread

25: cable shielding layer

26: outer sheath

27: shielding ring

28: plug insulator

29: external pouring sealant

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects of the plug cable assembly according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.

Please refer to fig. 1-7, which are schematic structural diagrams of each part of the plug cable assembly of the present invention, the plug cable assembly includes a plug and a nuclear instrument cable 2 sealed with glue at the tail of the plug, the nuclear instrument cable 2 has a core wire, a cable shielding layer and an outer sheath. The plug comprises a plug shell 1, a plug insulator 28 is positioned and assembled in the plug shell 1, a plug contact element is arranged in the plug insulator, the rear end of the plug contact element is connected with a core wire of the nuclear-grade instrument cable 2, an inner potting colloid fixedly wrapping the connection position of the plug contact element and the core wire is potted in the plug shell, and the plug insulator, the plug contact element and the front end of the cable are fixedly connected together through the inner potting colloid. The front end of the cable shield 25 is circumferentially laid on the outer peripheral surface of the inner pouring sealant and fixed in a shielding ring 27, and the shielding ring 27 is radially stopped and limited in the plug shell and is connected with the plug shell through a grounding spring. An outer potting adhesive 29 wrapped outside the cable outer sheath 26 is encapsulated between the plug shell and the nuclear-grade instrument cable in the plug shell, and the front end of the outer potting adhesive 29 stops and limits the rear end face of the shielding ring. The plug insulator is made of high-temperature-resistant aluminum oxide ceramic materials, and the surface is subjected to glaze sealing treatment, so that the surface smoothness and cleanliness are improved, and the surface electrical insulation performance is improved.

The plug shell 1 comprises a front plug shell 11 and a rear plug shell 12 which are welded together by laser, wherein the middle part of the periphery of the rear plug shell 12 is provided with an annular bulge 22, and the tail part of the rear plug shell is provided with an NPT thread to form an external thread section of the tail part of the plug. The tail part of the plug rear shell 12 and the cable extending out of the plug rear shell are sealed through a double-wall heat-shrinkable tube 3. In another embodiment of the present invention, the rear housing of the plug is not provided with a threaded section.

The plug rear housing 12 is connected to a metal hose for mechanical protection of the cable by means of an adapter fitting fixed to its outer circumference. The adapter comprises a cylindrical structure and an NPT joint 6, wherein the cylindrical structure is formed by buckling an upper cover plate 4 and a lower cover plate 5, the front end of the cylindrical structure is in axial stop fit with a plug shell and is prevented from rotating in the circumferential direction, and the NPT joint is in axial stop fit with the rear end of the cylindrical structure and is prevented from rotating in the circumferential direction; the NPT thread section at the tail part of the NPT joint 6 is connected with the internal thread of the front end joint of the metal hose 21 in a matching way.

In the embodiment of the utility model, upper and lower apron structure is the same for the cable position that the parcel pyrocondensation has pyrocondensation pipe 3, and realize respectively with plug afterbody casing and NPT joint 6 the installation fixed. The upper and lower cover plates are fixedly connected with the plug shell and the NPT joint 6 into a whole through a combined screw 18 after being assembled. The embodiment of the utility model provides an in, upper and lower apron is provided with screw hole and mating holes, and it is fixed that combination screw passes mating holes, screw hole in proper order and realizes the pressfitting between upper cover plate, lower apron and the plug. In order to prevent the loose of the combined screw in the vibration process and improve the vibration resistance of the adapter, the combined screw 18 is provided with a spring washer 19. Preferably, the two ends of the upper cover plate and the lower cover plate are convexly provided with fixing parts with screw holes and matching holes, when the upper cover plate and the lower cover plate are buckled, the screw holes of the fixing parts are overlapped with the matching holes, and the combined screw 18 sleeved with the spring washer 19 penetrates through the screw holes to realize the fixation of the upper cover plate and the lower cover plate.

The upper cover and the lower cover realize axial stop and limit through the matching of the limiting groove 17 at the front end of the upper cover and the peripheral convex ring-shaped bulge 22 of the plug shell, and the axial movement between the upper cover and the plug is prevented. The embodiment of the utility model provides an in, annular arch 22 is the protruding structure of hexagonal, upper and lower apron realizes and the circumference between the plug is only changeed through wearing to establish the protruding cooperation of milling flat face of the screw 10 terminal surface of only changeing in its upper thread hole and this hexagonal. In another embodiment of the present invention, the limiting groove 17 at the front end of the upper and lower cover plates is a hexagonal groove structure adapted to the hexagonal protrusion structure of the annular protrusion 22, and the axial stop and the circumferential rotation stop are simultaneously realized by the cooperation of the hexagonal protrusion and the hexagonal groove.

In another embodiment of the present invention, the upper and lower cover plates are engaged with the hexagonal annular protrusion 22 of the plug housing periphery through the hexagonal hole formed by the hexagonal-structure limiting blocks inside the front end of the upper and lower cover plates and are circumferentially locked with the plug housing. The upper cover plate and the lower cover plate are matched with the edge grooves on the transition surface between the two flat milling surfaces of the hexagonal protrusions through the end surfaces of the rotation stopping screws 10 in the threaded holes in the limiting blocks to realize axial stopping and limiting with the plug.

The periphery of the front end of the NPT joint 6 is provided with a positioning groove 23, the periphery of the tail part of the NPT joint is provided with NPT threads 24 used for being connected with a front end joint of a metal hose, the NPT joint is integrally embedded into one end of a cavity formed by an upper cover plate and a lower cover plate, and the outer threads of the NPT at the tail part are matched and connected with the inner threads of the NPT on the metal corrugated pipe joint. The NPT joint realizes axial and radial fixation with the upper cover plate and the lower cover plate through the limiting and rotation stopping characteristics on the NPT joint.

The rear ends of the upper cover plate and the lower cover plate are provided with positioning blocks 20 matched with the positioning grooves 23, and the axial stop limiting of the cover plate and the NPT joint is realized by clamping the positioning blocks in the positioning grooves. And anti-rotation facilities are also arranged between the upper cover plate and the NPT joint and between the lower cover plate and the NPT joint. The embodiment of the utility model provides an in, the NPT connects the front end periphery to have two annular protruding, forms constant head tank 23 between two annular protruding, and has flat on the annular protruding of leaning on the back, be equipped with the flat 15 in corresponding location in the apron from top to bottom, through flat and the apron on the NPT connect in the flat cooperation of location realize the two circumference spline.

In another embodiment of the present invention, the rotation of the NPT joint and the cover plate in the circumferential direction is achieved by the cooperation of the plurality of protrusions and the grooves or the cooperation of the rotation-preventing screws penetrating through the screw holes of the cover plate and the corresponding positioning surfaces or grooves on the NPT joint.

In another embodiment of the present invention, the positioning groove 23 on the NPT joint and the positioning blocks in the upper and lower cover plates are polygonal structures matched with each other, and the two realizes axial stop spacing and circumferential rotation stopping through the matching of the positioning groove and the positioning block of the polygonal structure.

The utility model discloses in an embodiment, the protruding locating piece that is equipped with in NPT joint front end periphery, be equipped with corresponding constant head tank in the upper and lower apron, it is spacing to realize the axial of the two through the cooperation of constant head tank and locating piece. And the positioning groove and the positioning block are also provided with a plurality of convex keys and key grooves for realizing circumferential rotation stopping of the positioning groove and the positioning block.

When the service environment requirement of this plug cable subassembly is higher, need completely cut off plug cable subassembly when non-metallic material's ageing junk in the use, the embodiment of the utility model provides a novel adapter fitting of structure is equipped with tongue and the recess of adaptation with it on two butt joint faces of this adapter fitting's upper and lower apron respectively for upper and lower apron can form confined space through tongue 13 and recess 14's cooperation, in order to prevent that the surplus thing that non-metallic material such as cable oversheath, pyrocondensation pipe aged for a long time produced from dropping in the nuclear power plant.

When the service environment requirement of this plug cable subassembly is general, but when the quality, the anti-seismic performance requirement of plug cable subassembly are higher, the utility model discloses another embodiment provides the adapter fitting of a novel structure, and the upper and lower apron of this adapter fitting is hollow out construction, has advantages such as light, intensity height, anti vibration performance are good.

In the embodiment of the present invention, the metal hose connector includes a front connecting sleeve 7 having an internal thread screwed with the NPT connector, a connecting nut 8 screwed at the tail of the front connecting sleeve, and a rear connecting sleeve 9 axially blocking the limited tail of the front connecting sleeve 7 and the connecting nut 8 and fixedly connecting the metal hose.

The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above description, and although the present invention has been disclosed with the preferred embodiment, it is not limited to the present invention, and any skilled person in the art can make modifications or changes equivalent to the equivalent embodiment of the above embodiments without departing from the scope of the present invention, but all the modifications, changes and modifications of the above embodiments by the technical spirit of the present invention are within the scope of the present invention.

Claims

1. A plug cable assembly comprising a plug and a cable, characterized in that: the tail part of the plug shell and the cable extending out of the plug shell are coated on the periphery of the plug shell through the front end, and the rear end of the plug shell is coated on the double-wall heat-shrinkable tube on the cable sheath to realize sealing; a metal hose is sleeved on the cable behind the double-wall heat shrinkable tube, and the front end connector of the metal hose is connected with the plug shell through an adapter fitting sleeved outside the double-wall heat shrinkable tube; the adapter comprises a cylindrical structure and an NPT joint, wherein the cylindrical structure is formed by buckling an upper cover plate and a lower cover plate, the front end of the cylindrical structure is matched with the plug shell in a compression joint mode to realize axial stop, limit and circumferential rotation prevention, and the NPT joint is matched with the rear end of the cylindrical structure in a compression joint mode to realize axial stop, limit and circumferential rotation prevention; the NPT thread section at the tail part of the NPT joint is connected with the internal thread of the front end joint of the metal hose in a matching way.

2. The plug cable assembly of claim 1, wherein: the upper cover plate and the lower cover plate are respectively matched with the plug shell and the annular bulges/positioning grooves corresponding to the peripheries of the NPT joints through the limiting grooves/limiting blocks in the front end and the rear end to realize axial stopping and limiting.

3. The plug cable assembly of claim 2, wherein: the upper cover plate and the lower cover plate realize circumferential rotation stopping through the matching of a plurality of convex keys/key slots in the front end and the rear end and corresponding key slots/convex keys on the plug shell and the periphery of the NPT joint.

4. The plug cable assembly of claim 2, wherein: the upper cover plate, the lower cover plate, the plug shell and the NPT joint are in concave-convex fit to realize that the axial stop limiting concave-convex part is of a polygonal structure, and circumferential rotation stopping is realized simultaneously through concave-convex fit of the polygonal structure.

5. The plug cable assembly of claim 2, wherein: the upper cover plate and the lower cover plate realize axial stop and limit through the inner limit grooves and the plug shell/and the NPT joint peripheral annular bulge, and the upper cover plate and the lower cover plate are also provided with rotation stopping screws with end faces pressed in corresponding planes or grooves on the annular bulge to realize circumferential rotation stopping.

6. The plug cable assembly of claim 1, wherein: the upper cover plate and the lower cover plate are matched with corresponding polygonal bulges on the periphery of the plug shell and/or the NPT joint through polygonal limiting block structures inside the upper cover plate and the lower cover plate to realize circumferential rotation stopping, and axial stopping and limiting are realized through the matching of rotation stopping screws penetrating through the upper cover plate and the polygonal bulges.

7. The plug cable assembly of claim 1, wherein: the cylindrical structure formed by the upper cover plate and the lower cover plate is a structure which is circumferentially closed to prevent internal substances from falling.

8. The plug cable assembly of claim 1, wherein: wherein the upper cover plate and the lower cover plate are both hollow structures.

9. The plug cable assembly of any one of claims 1-8, wherein: the upper cover plate and the lower cover plate are provided with threaded holes and corresponding matching holes for realizing the fixed connection of the upper cover plate and the lower cover plate, and the combined screws sleeved with the spring washers sequentially penetrate through the matching holes and the threaded holes to realize the press fit fixation of the upper cover plate and the lower cover plate.

10. The plug cable assembly of claim 9, wherein: the plug shell is internally encapsulated with an inner encapsulating colloid fixedly wrapping the joint of the plug contact element and the core wire, and an outer encapsulating colloid wrapping the outer sheath of the cable is encapsulated between the plug shell and the nuclear-grade instrument cable in the plug shell.