A cable assembly with a plug

Abstract

The present invention relates to a cable assembly with a plug. The cable assembly with a plug comprises a cable with a core wire, a cable shielding layer and an outer sheath. A plug is provided at the front end of the cable. The plug comprises a plug shell for grounding. A plug insulator and a plug contact are provided in the plug shell. The front end of the plug contact is a plug-in end, and the rear end is conductively connected to the core wire. An inner potting colloid is provided on the rear side of the plug insulator in the plug shell to form a fixed wrapping of 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 extends forward to surround and lay flat on the outer peripheral surface of the inner potting colloid. A shielding ring is provided in the plug shell, which is sleeved outside the inner potting colloid and the cable shielding layer and conductively connected to the plug shell. The front end of the shielding ring is stop-matched with the plug insulator, and the shielding ring is crimped and conductively connected to the cable shielding layer.

Description

Technical Field

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

[0002] As one of the basic electrical components, connectors are widely used in electrical connections between various types of equipment and within equipment. Through the fitting / separation of connectors, the circuit is connected / disconnected, and they are the "link" and "bridge" of system transmission. Since connectors need to be frequently fitted / separated, the contact parts will wear and change, and the organic sealing materials of connectors are easily affected by factors such as heat, light, and radiation in the environment, and age, and the sealing performance is reduced, which in turn affects the electrical equipment of the connector. Therefore, connectors are usually frequent places for electrical failures. Especially in the containment of nuclear power plants, there are a large number of monitoring, control and other instruments and instrument automation equipment. The design life of the connector components matched with the equipment is equivalent to the 60-year service life of the nuclear power plant. They need to withstand the test of high temperature, high humidity, and strong radiation in normal and abnormal conditions, as well as design basis accidents and severe accident conditions. In addition, the electrical signals transmitted in the instrument equipment are generally weak, and the connectors are also required to have good anti-electromagnetic interference capabilities.

[0003] The Chinese 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, wherein the plug includes a plug housing and a plug contact arranged in the plug housing, and the socket includes a socket housing and a socket contact arranged in the socket housing, wherein the socket is a glass sintered gas-sealed socket. Since the electrical connector is used in the nuclear industry, and the cable instruments in the nuclear industry transmit mostly weak electrical signals, a corresponding shielding structure needs to be configured to ensure that the connector has good anti-electromagnetic interference capability.

[0004] The Chinese utility model patent with the authorization announcement number CN201243131Y discloses a miniature connector for an integrally shielded cable, which includes a pin assembly, a base, a screw sleeve and a shell. The pin assembly is fixed in the base and then installed in the shell. The pin assembly is composed of a cable and a shielding ring. The cable includes a needle, a needle body, a wire, a shielding layer and a heat shrink sleeve (i.e., an outer sheath). The front end of the shielding layer is folded backward on the outer sheath and pressed on with a shielding ring. During the specific assembly, the cable is inserted into the shell, and the shielding ring is pushed from the back to the front into the annulus formed by the shell and the cable to press the shielding layer. However, since the shielding layer in the cable is folded backward, the shielding ring is easily driven to move the shielding layer during the process of pushing it forward for pressing, resulting in wrinkles and deformation, which affects the normal assembly of the shielding ring and the normal grounding of the shielding layer. Summary of the invention

[0005] The purpose of the present invention is to provide a cable assembly with a plug to solve the technical problem in the prior art that when a shielding ring is pressed onto a reversely folded cable shielding layer along the cable, the shielding layer is easily wrinkled and deformed, thereby affecting the normal assembly of the shielding ring.

[0006] The technical solution of the cable assembly with a plug provided by the present invention is as follows: a cable assembly with a plug, comprising a cable with a core wire, a cable shielding layer and an outer sheath, a plug is provided at the front end of the cable, the plug comprises a plug shell for grounding, a plug insulator and a plug contact are provided in the plug shell, the front end of the plug contact is a plug-in end, and the rear end is conductively connected to the core wire, an inner potting colloid is provided on the rear side of the plug insulator in the plug shell to form a potting to fix and wrap 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 extends forward to surround and lay flat on the outer peripheral surface of the inner potting colloid, the plug shell is provided with a shielding ring which is sleeved outside the inner potting colloid and the cable shielding layer and conductively connected to the plug shell, the shielding ring is pushed forward from the back to be assembled and pressed on the outside of the cable shielding layer, the front end of the shielding ring is matched with the stop of the plug insulator, and the shielding ring is crimped and conductively connected to the cable shielding layer.

[0007] Beneficial effects of the present invention: In the present invention, the inner potting colloid formed by potting on the rear side of the plug insulator is used to fix the plug insulator, the plug contact and the front end of the cable together to form a plug core body, which is convenient to assemble. Moreover, the existence of the inner potting colloid can support the flatly stretched cable shielding layer. When the shielding ring is pushed from the back to the front for assembly, the cable shielding layer flatly laid forward will not be wrinkled or stacked, and will not affect the normal assembly of the shielding ring. The wrinkle deformation problem that is easy to occur in the reversely folded cable shielding layer during press-fitting of the shielding in the prior art is effectively avoided. The inner potting colloid ensures that the cable shielding layer is laid more smoothly from the "inside", and the shielding ring is pushed from the back to the front to ensure that the cable shielding layer is laid more smoothly from the "outside". The two are "combined inside and outside" and work together to ensure the smooth assembly of the shielding layer.

[0008] The connection between the shielding ring and the cable shielding layer is further limited as follows: the shielding ring and the cable shielding layer are connected by welding. The welding connection ensures the stability of the conductive connection between the two and is also convenient for assembly.

[0009] On the basis of the above cable assembly scheme, the inner potting colloid is further defined as follows: the inner potting colloid has a front end that docks with the plug insulator, the front part of the inner potting colloid is cylindrical, and the radial dimension of the front end of the inner potting colloid is greater than the radial dimension of the rear end. The front part of the inner potting colloid is cylindrical, so that the part of the cable shielding layer laid flat on the front part of the inner potting colloid is evenly arranged, which can effectively ensure the conductive contact effect. At the same time, it can facilitate the assembly of the shielding ring from back to front while ensuring the conductive contact performance of the shielding ring and the cable shielding layer.

[0010] In the contact of each of the above cable assembly solutions, the conductive connection method between the plug housing and the shielding ring is further defined: the plug housing is provided with an annular groove, and a grounding piece conductively connected to the plug housing is fixed in the annular groove, and the grounding piece has an elastic contact portion elastically pressed against the shielding ring. The annular groove provided on the plug housing facilitates the pre-assembly of the grounding piece, and the conductive contact effect with the shielding ring can be improved by elastically pressing the elastic contact portion on the grounding piece against the shielding ring.

[0011] Based on the scheme of the cable assembly with the above grounding member, the grounding member is further defined as follows: the grounding member is a grounding spring that is glued and fixed in the annular groove. The grounding spring is light in weight and can be fixed by gluing, and is also relatively convenient to assemble.

[0012] On the basis of the above cable assembly solutions, the front and rear limit assembly of the plug core is further limited: the front of the plug shell is provided with a retaining spring that cooperates with the plug insulator, and the rear of the plug shell is provided with an external potting colloid potted between the plug core and the plug shell. The retaining spring and the external potting colloid are used to realize the front and rear limit assembly of the plug core, and the external potting colloid realizes the limit of the plug core while realizing the sealing.

[0013] Based on the above cable assembly solution, the assembly between the external potting colloid and the shielding ring is further limited: the front end of the external potting colloid extends to the rear end of the shielding ring. The external potting colloid can be used to further limit the shielding ring and improve the stability of the shielding ring after assembly.

[0014] The specific assembly structure of the shielding ring is further defined as follows: the front end of the shielding ring is provided with an outward-turned edge, the front end surface of the outward-turned edge is matched with the plug insulator, and the plug housing is provided with an annular protrusion that is matched with the rear side surface of the outward-turned edge when the plug core is pulled back to install. When installing the plug core, pull it from the front to the back and install it into the plug housing. When the annular protrusion and the outward-turned edge of the shielding ring are matched, it is considered that the assembly is in place. At this time, the retaining spring can be installed at the front end of the plug insulator. The assembly structure is simple and easy to operate.

[0015] On the basis of the above cable assembly solutions, the plug housing is further defined as follows: the plug housing includes 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 threaded 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 spirally assembled on the external threaded connection section of the rear housing. The metal hose is used to further protect the cable, and at the same time, the external threaded connection section provided at the rear end of the rear housing makes assembly and connection more convenient.

[0016] Further definition of the above-mentioned connecting sleeve assembly: 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, 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-to-back direction, 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. The front and rear connecting sleeves and the connecting sleeve connecting nut that are separately arranged are used to realize the connection between the metal hose and the rear shell part, which is simple to assemble and easy to repair and replace. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the cable assembly with a plug provided by the present invention in use;

[0018] Figure 2 yes Figure 1 Enlarged view of the middle shielding ring and grounding spring;

[0019] Figure 3 yes Figure 1 Schematic diagram of the exploded view of the middle plug and the shell connecting nut;

[0020] Figure 4 yes Figure 1 Exploded diagram of the middle socket;

[0021] Figure 5 is a schematic diagram of a cable assembly with a plug provided by the present invention when it is not assembled;

[0022] Figure 6 yes Figure 5 Schematic diagram of the shielding ring;

[0023] 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-connecting 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; 110-annular protrusion; 21-socket shell; 22-glass cake; 23-socket contact; 24-spiral slot; 211-socket rear shell; 212-socket front shell; 31-nail; 41-outer sheath; 42-cable shielding layer; 71-shielding ring; 711-outward turning edge; 72-inner potting colloid; 73-outer potting colloid; 74-grounding spring; 51-front connecting sleeve; 52-connecting sleeve connecting nut; 53-rear connecting sleeve. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] An embodiment of the present invention is Figures 1 to 6 As shown, Figure 1 Shown is a connector cable assembly, which includes a cable assembly with a plug and a socket 200. The cable assembly with a plug includes a plug 100 and a cable 400. The connector cable assembly also includes a shell connecting nut 300 that locks the plug 100 and the socket 200 when they are inserted into place.

[0026] like Figure 1 , Figure 2 and Figure 5 As 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.

[0027] 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 1As 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.

[0028] like Figure 1 , Figure 2 and Figure 5 As shown, the 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), 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.

[0029] 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 utility model 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.

[0030] The gap between the plug housing 19 and the outer sheath 41 is filled with an external potting colloid 73, the front end of which presses against the rear end of the shielding ring 71 to limit the shielding ring 71. The external potting colloid 73 is used to fix the cable 400 and seal the gap between the cable 400 and the plug housing 19.

[0031] 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.

[0032] 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.

[0033] Depend on Figure 1 and Figure 5 It 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.

[0034] 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 colloid 73 is potted and molded between the outer sheath 41 and the plug housing 19 to complete the assembly of the cable assembly with the plug.

[0035] 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.

[0036] In this embodiment, the external potting colloid 73 extends to the rear end of the shielding ring 71 to press the shielding ring 71 . In other embodiments, the external potting colloid 73 may not extend to this position.

[0037] 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.

[0038] In this embodiment, the plug housing 19 is formed by laser welding two parts, and may also be an integrated structure in other embodiments.

[0039] In this embodiment, the plug housing 19 and the socket housing 21 are both metal housings to achieve grounding.

[0040] 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 cable assembly with a plug, comprising 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 comprises a plug housing for grounding, a plug insulator and a plug contact are provided in the plug housing, the front end of the plug contact is a plug-in end, and the rear end is conductively connected to the core wire, characterized in that: An inner potting colloid is provided on the rear side of the plug insulator in the plug housing 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 extends forward to surround and lay flat on the outer peripheral surface of the inner potting colloid. The plug housing is provided with a shielding ring which is sleeved outside the inner potting colloid and the cable shielding layer and is conductively connected to the plug housing. The shielding ring is pushed forward from the back to the front to be assembled and pressed on the outside of the cable shielding layer. The front end of the shielding ring is matched with the stop of the plug insulator. The shielding ring is crimped and conductively connected to the cable shielding layer. The inner potting colloid has a front end that is butted against the plug insulator. The front part of the inner potting colloid is cylindrical. The radial dimension of the front end of the inner potting colloid is greater than the radial dimension of the rear end.

2. The cable assembly with a plug according to claim 1, characterized in that: The shielding ring is connected to the cable shielding layer by welding.

3. The cable assembly with a plug according to claim 1 or 2, characterized in that: The plug housing is provided with an annular groove, in which a grounding piece electrically connected to the plug housing is fixedly provided, and the grounding piece has an elastic contact portion elastically pressed against the shielding ring.

4. The cable assembly with a plug according to claim 3, characterized in that: The grounding piece is a grounding spring which is glued and fixed in the annular groove.

5. The cable assembly with a plug according to claim 1 or 2, characterized in that: The front part of the plug shell is provided with a clamping spring which is matched with the plug insulator for blocking, and the rear part of the plug shell is provided with an external potting colloid potted between the plug core and the plug shell.

6. The cable assembly with a plug according to claim 5, characterized in that: The front end of the external potting colloid extends to the rear end of the shielding ring.

7. The cable assembly with a plug according to claim 5, characterized in that: The front end of the shielding ring is provided with an outwardly turned edge, the front end surface of the outwardly turned edge is matched with the plug insulator for stopping, and the plug housing is provided with an annular protrusion which is matched with the rear side surface of the outwardly turned edge for stopping when the plug core is pulled back.

8. The cable assembly with a plug according to claim 1 or 2, 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, the rear end of the rear housing is provided with an externally threaded connecting section, the cable is sleeved with a metal hose behind the plug housing, a connecting sleeve assembly is provided at the front end of the metal hose, and the connecting sleeve assembly is spirally assembled on the externally threaded connecting section of the rear housing.

9. The cable assembly with a plug 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.

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