CN115832754A - Explosion-proof socket and arc-extinguishing type connector - Google Patents

Abstract

The invention provides an explosion-proof socket and an arc-extinguishing type connector, wherein the explosion-proof socket is matched with the plug for use, the plug comprises a contact pin, the explosion-proof socket comprises a first shell part with a hollow interior, a socket base assembly is arranged in the first shell part, the socket base assembly comprises an electric connecting piece, one end of the electric connecting piece is a cable connecting section for connecting a cable, the other end of the electric connecting piece is a jack section for accommodating the contact pin, the socket base assembly also comprises an arc-absorbing piece, the arc-absorbing piece is provided with an arc-absorbing cavity, the arc-absorbing cavity comprises a first cavity and a second cavity, the jack section of the electric connecting piece is installed in the first cavity, a first gap is formed between the jack section and the inner wall of the first cavity, the inner diameter of the second cavity is smaller than or equal to the diameter of the contact pin, when the contact pin is inserted into the jack section through the second cavity, generated electric arc is retained in the first gap and is absorbed by the arc-absorbing interference, and the contact pin is attached to or matched with the inner wall of the second cavity and is used for preventing the electric arc from overflowing from the first gap.

Description

Explosion-proof socket and arc-extinguishing type connector

Technical Field

The invention relates to the technical field of electric connectors, in particular to an explosion-proof socket and an arc-extinguishing type connector.

Background

The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

With the continuous development of the electric connector, the functions of the electric connector are continuously improved, the functions of the petroleum and chemical electric connector are particularly complex, the connector and the assembly are required to meet the requirements of air tightness and water tightness, and the connector is required to have the capabilities of fool proofing, explosion proofing, electromagnetic shielding and ground protection, which are all problems to be mainly solved in the prior art.

The plug and the socket are electrically characterized by high current and high voltage, and when the plug and the socket are in poor butt joint, separation or electric contact, the problem of electric arc is easy to occur, and the electric arc causes explosion of explosive gas or dust in an inner cavity of the explosion-proof connector formed by the plug and the socket, so that the safety performance of the connector is reduced. The patent: the patent CN105742887A/B and the like can not design or apply the flame-proof connector from the base and the arc absorbing structure or related structures, only realizes the flame-proof of the flame-proof surface of the shell, the base and the flame-proof surface of the contact element, but does not solve the potential or direct detonation source causing the connector explosion.

It should be noted that the above background description is only for the sake of clarity and complete description of the technical solutions of the present invention and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the invention.

Disclosure of Invention

The invention aims to solve the technical problem of providing an explosion-proof socket and an arc-extinguishing type connector, wherein electric arcs are generated by electric contacts under the environments of large current, high voltage plugging or electric contact and the like, and the electric arcs can be automatically extinguished in an arc-extinguishing structure.

In order to solve the technical problem, the invention provides an explosion-proof socket of an arc-extinguishing type connector, which is used in cooperation with a plug, wherein the plug comprises a contact pin, the explosion-proof socket comprises a first shell part with a hollow inner part, a socket base assembly is arranged in the first shell part, the socket base assembly comprises an electric connecting piece, one end of the electric connecting piece is a cable connecting section used for connecting a cable, the other end of the electric connecting piece is a jack section used for accommodating the contact pin, the socket base assembly further comprises an arc-absorbing piece, the arc-absorbing piece is provided with an arc-absorbing cavity, the arc-absorbing cavity comprises a first cavity and a second cavity, the jack section of the electric connecting piece is installed in the first cavity, a first gap is formed between the jack section and the inner wall of the first cavity, the inner diameter of the second cavity is smaller than or equal to the diameter of the contact pin, when the contact pin is inserted into the jack section through the second cavity, the generated arc is retained in the first gap and absorbed by the arc-absorbing piece, and the contact pin is attached to or in interference fit with the inner wall of the second cavity, and is used for blocking the arc from overflowing from the first gap.

Preferably, the arc absorbing part comprises a first arc absorbing sleeve and a second arc absorbing sleeve, the second arc absorbing sleeve is provided with a plurality of through holes, the first arc absorbing sleeve is arranged in the through holes, the outer wall of the first arc absorbing sleeve is attached to the inner wall of the through holes, the space defined by the first arc absorbing sleeve is the second cavity, the inner diameter of the first arc absorbing sleeve is smaller than or equal to the diameter of the contact pin, and when the contact pin is inserted into the jack section, the contact pin is attached to or in interference fit with the first arc absorbing sleeve.

Preferably, the arc-absorbing cavity further comprises a third cavity, the first cavity, the second cavity and the third cavity are sequentially arranged, the inner diameter of the third cavity is larger than the diameter of the contact pin, the plug is sequentially inserted into the jack section through the third cavity and the second cavity, a second gap is formed between the inner wall of the third cavity and the contact pin, and when the arc overflows to the second gap from the position between the inner wall of the second cavity and the contact pin, the arc-absorbing part can absorb the arc.

Preferably, the socket base assembly further comprises a third arc absorbing sleeve, the cable connecting section of the electric connector is arranged in the third arc absorbing sleeve, and the third arc absorbing sleeve can absorb the arc between the cable and the electric connector.

Preferably, the first gap comprises a first gap portion formed between the end face of the electric connector and the end face of the first cavity and a second gap portion formed between the side wall of the electric connector and the side wall of the first cavity, the first gap portion is communicated with the second gap portion, and after the plug is inserted into the jack section, an electric arc generated enters the second gap portion after passing through the first gap portion; and/or, the electric connector also comprises a sealing section, the sealing section is arranged between the cable connecting section and the jack section, the socket base assembly also comprises a socket rubber base, the socket rubber base is arranged between the second arc suction sleeve and the third arc suction sleeve, the socket rubber base is arranged on the outer wall of the sealing section, after the plug is inserted into the jack section, the rear end of the gap part II is sealed by the socket rubber base, and the front end of the gap part I is sealed by the contact pin and the first arc suction sleeve, so that the first gap forms a closed space.

Preferably, the first outer shell member includes a first socket housing and a second socket housing which can be butt-jointed and combined with each other, the first socket housing and the second socket housing respectively include a first end and a second end which are opposite to each other, the first socket housing and the second socket housing are of a middle through tube structure, the first end of the first socket housing is embedded into the second end of the second socket housing, the first outer shell member further includes a support ring which is located between the first socket housing and the second socket housing, the support ring is provided with a support ring elastic sheet, when the first socket housing and the second socket housing are butt-jointed, the support ring elastic sheet is extruded between the first socket housing and the second socket housing, and the support ring is respectively contacted with the first socket housing and the second socket housing, so that the electrical connection among the first socket housing, the support ring and the second socket housing is realized.

Preferably, the support ring elastic sheet is offset along the radial direction of the support ring and extends along the screwing direction of the threads of the first socket housing or the second socket housing, and when the first socket housing and the second socket housing are screwed, the end of the support ring elastic sheet can abut against the first socket housing or the second socket housing.

Preferably, the inner surface of the second socket shell is provided with an internal thread, a tool withdrawal groove and an annular boss in sequence, the outer surface of the first socket shell is provided with a first external thread, the first socket shell and the second socket shell are in threaded fit connection with the internal thread through the first external thread, the first outer shell further comprises a support ring gasket located between the first socket shell and the second socket shell, the annular boss is used for supporting the support ring, the support ring gasket is embedded into the tool withdrawal groove, and the external thread end face of the first socket shell extrudes the support ring gasket to realize sealing between the first socket shell and the second socket shell.

Preferably, the cross-section of support ring be L shape, the support ring includes the ring seat, the axial extension of support ring is followed to the inside edge of ring seat, forms the rampart, the support ring shell fragment locate the rampart on, relative the rampart along the radial outside perk of support ring, and extend along the screw thread tightening direction of first socket shell, the circumference of a plurality of support ring shell fragments along the support ring distributes, the bottom of ring seat support in annular boss, support ring and tool withdrawal groove between form a U type groove, the support ring pad arrange this U type inslot in, dock the back between first socket shell and the second socket shell, the top of the rampart of support ring gets into first socket shell inner wall, support ring shell fragment and the inside elastic contact of first socket shell, the terminal surface of annular boss is electrically conductive interface, the support ring be the conductor, the inner wall of first socket shell be electrically conductive interface, realize the electrical connection between first socket shell, support ring, the second socket shell.

The application also provides an arc extinguishing type connector, include the flame proof socket, the arc extinguishing type connector still include with flame proof socket cooperation plug and the stuffing box of using.

By means of the technical scheme, the invention has the following beneficial effects:

1. the explosion-proof socket and the arc-extinguishing type connector are provided with the arc-extinguishing structure, the butt joint or the separation of the contact pin and the jack is completed in the arc-absorbing sleeve, electric arcs generated when the contact pin is plugged in or pulled out in a hot mode or separated from the contact pin are left in the first gap and are absorbed by the arc-absorbing piece, and the two ends of the first gap are sealed, so that the electric arcs can be prevented from overflowing.

2. According to the flameproof socket and the arc-extinguishing type connector, the first socket shell and the second socket shell are in electrical contact through the support ring, the support ring is provided with the support ring elastic sheet, the support ring elastic sheet is extruded between the first socket shell and the second socket shell and is in contact with the first socket shell and the second socket shell respectively, electrical connection among the first socket shell, the support ring and the second socket shell is guaranteed, a complete metal shielding layer is formed, signal shielding of internal wires is achieved, meanwhile, sealing is achieved between the first socket shell and the second socket shell through the support ring pad, and water/oil with impurities is prevented from entering.

Drawings

Fig. 1 is a schematic cross-sectional view of an arc-extinguishing type connector of the present application.

Fig. 2 is an exploded cross-sectional view of the present application's arc extinguishing type connector.

FIG. 3 is an explosion structure diagram of the flameproof socket of the present application.

Fig. 4 is a partially enlarged view of a portion a of fig. 2.

Fig. 5 is a schematic view of a partial connection structure of the first and second socket housings of the present application.

Fig. 6 is a schematic structural view of the support ring of the present application.

Figure 7 is a cross-sectional schematic view of a support ring of the present application.

Fig. 8 is a schematic structural diagram of a first receptacle housing according to the present application.

Fig. 9 is a schematic cross-sectional view of a first socket housing according to the present application.

Fig. 10 is a sectional view of the socket base assembly according to the first embodiment of the present application.

Fig. 11 is a sectional view showing a socket base assembly according to a second embodiment of the present application.

Fig. 12 is a cross-sectional structural view of the plug base assembly of the present application.

Fig. 13 is a cross-sectional structural view of the plug base assembly and the socket base assembly of the present application after being connected.

FIG. 14 is a schematic view of an electrical connector of the present application.

Fig. 15 is a schematic cross-sectional view of an electrical connector of the present application.

Fig. 16 is a schematic structural view of the arc absorbing member of the present application.

Fig. 17 is a schematic cross-sectional structural view of the arc absorbing member of the present application.

Wherein: 1. an explosion-proof plug; 2. an explosion-proof socket; 3. a stuffing box; 11. a first plug housing; 12. a locking sleeve; 13. a second plug housing; 14. a plug base assembly; 141. Inserting a pin; 131. A long convex key; 21. a first socket housing; 211. a flange; 212. the first external thread; 213. an external thread end face; 214. an inner groove; 217. A second external thread; 22. a second socket housing; 221. an internal thread; 222. a tool withdrawal groove; 223. an annular boss; 23. a socket base assembly; 231. a second arc suction sleeve; 231', an arc absorbing member; 232. a third arc suction sleeve; 233. a socket rubber base; 234. an electrical connection; 235. a first arc absorbing sleeve; 2341. a cable connection section; 2342. a jack section; 2343. a grounding reed; 2344. a sealing section; 2311. an arc suction cavity; 23111. a first cavity; 23112. a second cavity; 23113. a third cavity; 236. a first gap; 2361. a first gap part; 2362. a second gap part; 237. a second gap; 24. a support ring; 241. a support ring elastic sheet; 242. a ring seat; 243. an annular wall; 25. and a support ring pad.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

It should be noted that, in the description of the present invention, the terms "first", "second", and the like are used for descriptive purposes only and for distinguishing similar objects, and no precedence between the two is considered as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

As shown in fig. 1 and 2, the arc extinguishing type connector of the present application includes an explosion-proof socket 2, an explosion-proof plug 1 and a stuffing box 3.

As shown in fig. 3, 4 and 5, flame proof socket 2 uses with flame proof plug 1 cooperation, and flame proof plug 1 includes contact pin 141, and flame proof socket 2 is provided with socket base closes piece 23 in including inside hollow shell spare one, and shell spare one is including first socket casing 21 and the second socket casing 22 that can the mutual butt joint combination, first socket casing 21 and second socket casing 22 include relative first end and second end respectively.

The first socket housing 21 and the second socket housing 22 are of a through tube structure, the first end of the first socket housing 21 is embedded into the second end of the second socket housing 22, and the first housing further includes a support ring 24 located between the first socket housing 21 and the second socket housing 22.

As shown in fig. 6 and 7, the support ring 24 is provided with a support ring elastic piece 241, when the first socket housing 21 and the second socket housing 22 are butted, the support ring elastic piece 241 is pressed between the first socket housing 21 and the second socket housing 22, and the support ring 24 is respectively contacted with the first socket housing 21 and the second socket housing 22, so as to realize the electrical connection among the first socket housing 21, the support ring 24, and the second socket housing 22. The support ring spring 241 is offset in the radial direction of the support ring 24 and extends in the screw tightening direction, the support ring spring 241 may be offset inwardly or outwardly with respect to the annular wall 243 of the support ring 24, and when the first and second socket housings 21 and 22 are screw-tightened, the end of the support ring spring 241 can always abut against the inner wall of the first or second socket housing 21 or 22.

As shown in fig. 8 and 9, in a preferred embodiment, the inner surface of the second end of the second socket housing 22 is sequentially provided with an internal thread 221, a relief groove 222, and an annular boss 223, the outer surface of the first socket housing 21 is provided with an external thread first 212, the first socket housing 21 and the second socket housing 22 are in threaded fit connection with the internal thread 221 through the external thread first 212, the first shell further includes a support ring pad 25 located between the first socket housing 21 and the second socket housing 22, the annular boss 223 is used for supporting the support ring 24, the support ring pad 25 is embedded into the relief groove 222, and the external thread end surface 213 of the first socket housing 21 presses the support ring pad 25, so as to achieve sealing between the first socket housing 21 and the second socket housing 22. As shown in fig. 6 and 7, the cross section of the support ring 24 is L-shaped, the support ring 24 includes a ring seat 242, an inner edge of the ring seat 242 extends along an axial direction of the support ring 24 to form a ring wall 243, the ring wall 243 of the support ring 24 is provided with a plurality of L-shaped notches, the ring wall at the L-shaped notches tilts outward in a radial direction of the support ring 24 to form a support ring spring 241, the support ring spring 241 extends along a screwing direction of the first receptacle housing 21 from a root to an end, a bottom of the ring seat 242 abuts against the annular boss 223, a U-shaped groove is formed between the support ring 24 and the relief groove 222, the support ring pad 25 is disposed in the U-shaped groove, after the first receptacle housing 21 and the second receptacle housing 22 are butted, a top of the ring wall 243 of the support ring 24 enters an inner wall of the first receptacle housing 21, the end of the support ring spring 241 is always kept in elastic contact with the inner wall of the first receptacle housing 21, an end surface of the annular boss 223 is a conductive interface, the support ring 24 is a conductor, an inner wall of the first receptacle housing 21 is a conductive interface, an electrical connection between the first receptacle housing 21, the second receptacle housing 24 and the second receptacle housing 22 is a complete shielding layer is formed.

Since the support ring pad 25 is made of an elastic material, it is easily inserted into the U-shaped groove, and since the support ring pad 25 is inserted into the relief groove 222, the support ring pad 25 is blocked by the internal thread 221 of the second socket housing 22, and the support ring pad 25 is not easily separated from the U-shaped groove. In addition, due to the structural design of the supporting ring elastic sheet 241, the supporting ring 24 and the first socket housing 21 are always kept in elastic close contact, and the first socket housing 21 presses the supporting ring 24, so that poor contact is prevented.

In the present embodiment, the connection between the first receptacle housing 21 and the second receptacle housing 22 is implemented by using the support ring 24 as an adapter bridge, the first receptacle housing 21 is in elastic contact with the support ring spring 241, the support ring 24 is in rigid conductive contact with the annular boss 223 of the second receptacle housing 22, the connection is implemented by screwing the first receptacle housing 21 and the second receptacle housing 22, the threaded end surface of the first receptacle housing 21 presses the support ring pad 25, and the support ring pad 25 presses the support ring 24, so that the effective contact between the support ring 24 and the first receptacle housing 21 and the second receptacle housing 22 is ensured.

The outer surface of the first socket housing 21 is further provided with a flange 211, when the second socket housing 22 is connected with the first socket housing 21, the top of the second socket housing 22 is in surface contact with the flange 211 of the first socket housing 21, so that the first socket housing 21 and the second socket housing 22 are limited, and the flange 211 is further provided with a plurality of wire mounting holes for electrically connecting the arc-extinguishing type connector with external equipment.

As shown in fig. 10-17, the receptacle base assembly 23 includes an electrical connector 234, the electrical connector 234 includes a cable connecting section 2341 at one end for connecting a cable and a socket section 2342 at the other end for receiving the pin 141, the receptacle base assembly 23 further includes an arc absorbing member 231', the arc absorbing member 231' has an arc absorbing cavity 2311, the arc absorbing cavity 2311 includes a first cavity 23111 and a second cavity 23112, the socket section 2342 of the electrical connector 234 is installed in the first cavity 23111, the socket section 2342 has a first gap 236 with an inner wall of the first cavity 23111, the inner diameter of the second cavity 23112 is smaller than or equal to the diameter of the pin 141, when the pin 141 is inserted into the socket section 2342 through the second cavity 23112, an arc generated is absorbed in the first gap 236 by the arc absorbing member 231', and the pin 141 abuts against or interferes with the inner wall of the second cavity 23112 to block the arc from escaping from the first gap 236. The arc absorption cavity 2311 further comprises a third cavity 23113, the first cavity 23111, the second cavity 23112 and the third cavity 23113 are sequentially arranged, the inner diameter of the third cavity 23113 is larger than the diameter of the pin 141, the plug is sequentially inserted into the insertion hole section 2342 through the third cavity 23113 and the second cavity 23112, a second gap 237 is formed between the inner wall of the third cavity 23113 and the pin 141, and after the arc overflows to the second gap 237 from the space between the inner wall of the second cavity 23112 and the pin 141, the arc can be absorbed by the arc absorption piece 231'.

In a preferred embodiment, as shown in fig. 10, the arc suction member 231' includes a first arc suction sleeve 235 and a second arc suction sleeve 231, the second arc suction sleeve 231 is provided with a plurality of through holes, the first arc suction sleeve 235 is disposed in the through holes, an outer wall of the first arc suction sleeve 235 fits against an inner wall of the through holes, the first arc suction sleeve 235 defines a space as a second cavity 23112, an inner diameter of the first arc suction sleeve 235 is smaller than or equal to a diameter of the pin 141, and when the pin 141 is inserted into the insertion hole section 2342, the pin 141 fits against or is in interference fit with the first arc suction sleeve 235. The receptacle base assembly 23 further includes a third arc-absorbing sleeve 232, the cable connection segment 2341 of the electrical connector 234 being disposed within the third arc-absorbing sleeve 232, the third arc-absorbing sleeve 232 being capable of absorbing an arc between the cable and the electrical connector 234.

As shown in fig. 13, the first gap 236 includes a first gap portion 2361 formed between the end surface of the electrical connector 234 and the end surface of the first cavity 23111, and a second gap portion 2362 formed between the side wall of the electrical connector 234 and the side wall of the first cavity 23111, the first gap portion 2361 communicates with the second gap portion 2362, and after the plug is inserted into the inserting hole section 2342, the generated arc passes through the first gap portion 2361 and enters the second gap portion 2362.

As shown in fig. 14 and 15, the electrical connector 234 further includes a sealing section 2344, the sealing section 2344 is disposed between the cable connection section 2341 and the insertion hole section 2342, the socket base assembly 23 further includes a socket rubber base 233, the socket rubber base 233 is disposed between the second arc absorbing sleeve 231 and the third arc absorbing sleeve 232, the socket rubber base 233 is mounted on an outer wall of the sealing section 2344, after the plug is inserted into the insertion hole section 2342, a rear end of the gap portion two 2362 is sealed by the socket rubber base 233, and a front end of the gap portion one 2361 is sealed by the pin 141 and the first arc absorbing sleeve 235, so that the first gap 236 forms a sealed space. The second arc suction sleeve 231 includes a first end and a second end, and the first end of the second arc suction sleeve 231 is in contact with the socket rubber base 233.

The socket rubber base 233, the first arc absorbing sleeve 235, the second arc absorbing sleeve 231 and the third arc absorbing sleeve 232 are made of arc-resistant materials matched with an arc absorbing structure, so that the connector can meet arc ablation generated by 500-time plugging and unplugging, and the safety of products is effectively guaranteed. In a preferred embodiment, the second arc absorbing member 231' is a SMC material, higher durometer, fiber reinforced unsaturated polyester sheet molding compound; the first arc absorbing member 231' is made of rubber material having elasticity, i.e., a mixture of butyl rubber and styrene-butadiene.

As shown in fig. 15, the socket base assembly 23 includes a plurality of electrical connectors 234, at least one electrical connector 234 of the plurality of electrical connectors 234 is provided with a grounding reed 2343, and the grounding reed 2343 is in contact abutment with the housing member.

As shown in FIGS. 1 and 2, the flameproof plug 1 comprises a second shell part, a plug base assembly 14 is arranged in the second shell part, the plug base assembly 14 comprises a plug, and the second shell part comprises a first plug shell 11 and a second plug shell 13 which can be mutually butted and combined. The first plug housing 11 and the second plug housing 13 include first and second opposite ends, respectively. The first plug housing 11 and the second plug housing 13 are of a through tubular structure, and a first end of the first plug housing 11 is embedded into a second end of the second plug housing 13. The second shell element further comprises a locking sleeve 12 which is sleeved outside the first plug shell 11 and the second plug shell 13 in a limiting manner. Still reserve between first plug housing 11 and the lock sleeve 12 and have the butt joint clearance, the second end of first plug housing 11 and the second end butt joint of first socket casing 21, first plug housing 11 is cup jointed in the hole of first socket casing 21, and the pore wall of first socket casing 21 can be pegged graft and establish into in the butt joint clearance between first plug housing 11 and the lock sleeve 12. The outer wall of the first socket housing 21 is threadedly coupled to the inner wall of the locking sleeve 12.

The inner wall of the second end of the first socket housing 21 is provided with an inner groove 214 extending in the axial direction, the outer wall of the first plug housing 11 is provided with a long convex key 131 extending in the axial direction, and the inner groove 214 and the long convex key 131 are arranged corresponding to each other. When the second end of the first plug housing 11 is inserted into the second end of the first socket housing 21, the long convex key 131 of the first plug housing 11 is embedded into the inner groove 214 of the first socket housing 21, so that the functions of guiding, preventing rotation and misplugging of the contact of the connector are achieved, meanwhile, blind insertion of a product is achieved, and the contact is not damaged.

The end face of the second end of the second arc absorbing sleeve 231 is located in the first socket shell 21 and has a certain distance from the end face of the second end of the first socket shell 21, so that when the explosion-proof plug 1 is in butt joint with the explosion-proof socket 2, the long convex key 131 is firstly inserted into the inner groove 214 to complete the positioning of the first plug shell 11 and the first socket shell 21, then the pin 141 is inserted into the arc absorbing cavity 2311, and finally the pin 141 is in butt joint with the jack, so that blind plugging of a product is realized, and the pin 141 and the jack are not damaged.

As shown in fig. 1 and 2, the connector further comprises a stuffing box 3, the second socket shell is in butt joint and locking with the stuffing box 3 through threads, and a support sleeve of the stuffing box 3 is matched with a cylindrical surface at the tail of the second socket shell to form an explosion-proof flame-retardant passage.

The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.

Claims (10)

1. The explosion-proof socket of the arc-extinguishing type connector is matched with a plug for use, the plug comprises a contact pin, the explosion-proof socket comprises a first shell part with a hollow inner part, a socket base assembly is arranged in the first shell part, the socket base assembly comprises an electric connector, one end of the electric connector is a cable connecting section for connecting a cable, the other end of the electric connector is a jack section for accommodating the contact pin, the explosion-proof socket is characterized in that,

the socket base assembly further comprises an arc absorbing piece, the arc absorbing piece is provided with an arc absorbing cavity, the arc absorbing cavity comprises a first cavity and a second cavity, the jack section of the electric connecting piece is installed in the first cavity, a first gap is formed between the jack section and the inner wall of the first cavity,

the inner diameter of the second cavity is smaller than or equal to the diameter of the contact pin, when the contact pin is inserted into the jack section through the second cavity, the generated electric arc is left in the first gap and absorbed by the arc absorbing piece, and the contact pin is attached to or in interference fit with the inner wall of the second cavity and used for preventing the electric arc from overflowing from the first gap.

2. The flameproof socket according to claim 1, wherein the arc absorbing member comprises a first arc absorbing sleeve and a second arc absorbing sleeve, the second arc absorbing sleeve is provided with a plurality of through holes, the first arc absorbing sleeve is arranged in the through holes, the outer wall of the first arc absorbing sleeve is attached to the inner wall of the through holes, the space defined by the first arc absorbing sleeve is the second cavity, the inner diameter of the first arc absorbing sleeve is smaller than or equal to the diameter of the contact pin, and when the contact pin is inserted into the jack section, the contact pin is attached to or in interference fit with the first arc absorbing sleeve.

3. The flameproof socket according to claim 2, wherein the arc absorption cavity further comprises a third cavity, the first cavity, the second cavity and the third cavity are sequentially arranged, the inner diameter of the third cavity is larger than the diameter of the contact pin, the plug is inserted into the jack section through the third cavity and the second cavity in sequence, a second gap is formed between the inner wall of the third cavity and the contact pin, and when an arc overflows from the space between the inner wall of the second cavity and the contact pin to the second gap, the arc can be absorbed by the arc absorption piece.

4. The flameproof socket according to claim 3, wherein the socket base assembly further comprises a third arc-absorbing sleeve, the cable connecting section of the electrical connector is arranged in the third arc-absorbing sleeve, and the third arc-absorbing sleeve can absorb the arc between the cable and the electrical connector.

5. The flameproof socket according to claim 4, wherein the first gap comprises a first gap part formed between the end surface of the electric connector and the end surface of the first cavity and a second gap part formed between the side wall of the electric connector and the side wall of the first cavity, the first gap part is communicated with the second gap part, and after the plug is inserted into the jack section, an electric arc generated enters the second gap part after passing through the first gap part;

and/or, the electric connector also comprises a sealing section, the sealing section is arranged between the cable connecting section and the jack section, the socket base assembly also comprises a socket rubber base, the socket rubber base is arranged between the second arc suction sleeve and the third arc suction sleeve, the socket rubber base is arranged on the outer wall of the sealing section, after the plug is inserted into the jack section, the rear end of the gap part II is sealed by the socket rubber base, and the front end of the gap part I is sealed by the contact pin and the first arc suction sleeve, so that the first gap forms a closed space.

6. The flameproof socket of claim 1, wherein the first housing member comprises a first socket housing and a second socket housing that are butt-jointed and combinable with each other, the first socket housing and the second socket housing respectively comprise a first end and a second end that are opposite to each other,

the first socket shell and the second socket shell are of a through tube structure, the first end of the first socket shell is embedded into the second end of the second socket shell, the first shell further comprises a support ring positioned between the first socket shell and the second socket shell,

the support ring is provided with a support ring elastic sheet, when the first socket shell and the second socket shell are in butt joint, the support ring elastic sheet is extruded between the first socket shell and the second socket shell, and the support ring is respectively contacted with the first socket shell and the second socket shell to realize the electrical connection among the first socket shell, the support ring and the second socket shell.

7. The flameproof socket of claim 6, wherein the support ring spring is radially offset along the support ring and extends in a direction along which the first socket housing or the second socket housing is screwed, and when the first socket housing and the second socket housing are screwed, an end of the support ring spring can abut against the first socket housing or the second socket housing.

8. The flameproof socket according to claim 6, wherein an internal thread, a tool withdrawal groove and an annular boss are sequentially arranged on the inner surface of the second socket shell, an external thread I is arranged on the outer surface of the first socket shell, the first socket shell and the second socket shell are in threaded fit connection with the internal thread through the external thread I, the first shell further comprises a support ring pad located between the first socket shell and the second socket shell, the annular boss is used for supporting a support ring, the support ring pad is embedded into the tool withdrawal groove, and the support ring pad is extruded by the external thread end face of the first socket shell to realize sealing between the first socket shell and the second socket shell.

9. The flameproof socket according to claim 8, wherein the cross section of the support ring is L-shaped, the support ring comprises a ring seat, the inner edge of the ring seat extends in the axial direction of the support ring to form a ring wall, the support ring elastic pieces are arranged on the ring wall and tilt outwards along the radial direction of the support ring relative to the ring wall and extend along the screwing direction of the threads of the first socket shell, the plurality of support ring elastic pieces are distributed along the circumferential direction of the support ring, the bottom of the ring seat abuts against the annular boss, a U-shaped groove is formed between the support ring and the tool withdrawal groove, the support ring pad is arranged in the U-shaped groove, after the first socket shell and the second socket shell are butted, the top of the ring wall of the support ring enters the inner wall of the first socket shell, the support ring elastic pieces are in elastic contact with the inside of the first socket shell, the end face of the annular boss is a conductive interface, the support ring is a conductor, and the inner wall of the first socket shell is a conductive interface, so that the electrical connection between the first socket shell, the support ring and the second socket shell is realized.

10. The arc-extinguishing connector is characterized by comprising the explosion-proof socket in any one of claims 1 to 9, and the arc-extinguishing connector further comprises a plug and a stuffing box which are matched with the explosion-proof socket for use.

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