Explosion-proof connector

Abstract

An explosion-proof connector comprises a socket and a plug which can be matched with each other in an inserted mode, and the socket and the plug respectively comprise a shell and a core body arranged in the shell. The socket and the plug further comprise inner end sleeves covering the corresponding core bodies and inner pressing rings which are pressed on the edge portions of the inner end sleeves and are fixed to the shell through screws, and the core bodies are clamped and fixed between the inner end sleeves and the shell. After the contact pins or the plug bushes on the core body penetrate through the corresponding inner end sleeves and are axially inserted and matched, the inner pressing rings are pressed on the edge parts of the corresponding inner end sleeves, and the inner pressing rings are fixed on the shell through screws, so that the core body is stably clamped and fixed between the inner end sleeves and the shell in the axial direction and the circumferential direction, looseness caused by repeated plugging and unplugging between the contact pins and the plug bushes is avoided, and the service life of the core body is prolonged. In the plugging and unplugging process, matching is stable, sparks are not prone to being generated, using is safer, meanwhile, the situation in the core body can be checked by disassembling the screw, and maintenance and checking are convenient.

Description

Technical Field

[0001] The utility model belongs to the field of explosion-proof, and specifically relates to an explosion-proof connector. Background Art

[0002] In hazardous areas such as chemical plants, a large number of instruments are often required to monitor pipeline conditions at all times to ensure the normal operation of equipment and avoid accidents. Not only must the instruments be explosion-proof, but the electrical connectors on the power supply circuits that power the instruments must also be explosion-proof.

[0003] For example, Patent No. CN 214478152 U describes a highly explosion-proof connector comprising an explosion-proof plug and an explosion-proof socket. The explosion-proof socket comprises a socket barrel, within which a socket core is fixedly mounted. A plurality of circumferentially arranged sockets are fixedly mounted at the front end of the socket core and engage with the pins. The socket barrel is provided with a potting cavity located behind the socket core, through which the wires pass and the rear end of the socket core is potted. This solution employs a retaining spring disposed within a groove formed on the inner wall of the socket barrel to prevent the socket core from exiting the inner end of the barrel. However, this structure is prone to loosening during insertion and removal, resulting in loose contact when the pin is inserted into the socket, making sparks more likely to be generated and increasing the risk of use.

[0004] In order to solve the above problems, it is in line with market demand to develop an explosion-proof connector with stable plug and socket matching and high safety factor. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide an explosion-proof connector.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: an explosion-proof connector, comprising a socket and a plug that can be plugged in and matched with each other, the socket and the plug respectively comprising a housing and a core body arranged inside the housing, the socket and the plug further respectively comprising an inner end sleeve covering the corresponding core body, an inner pressure ring pressed on the edge of the inner end sleeve and fixed to the housing with screws, the core body being fixed between the inner end sleeve and the housing. After the pin or socket on the core body passes through the corresponding inner end sleeve and axially plugs in and matches, the inner pressure ring is pressed on the edge of the corresponding inner end sleeve and fixed to the housing with screws, so that the core body is stably fixed and fixed between the inner end sleeve and the housing in both axial and circumferential directions, avoiding loosening caused by repeated plugging and unplugging between the pin and the socket. The plug and unplug process is stable, sparks are not easily generated, and it is safer to use. At the same time, the internal condition of the core body can be checked by removing the screws, which is convenient for maintenance and inspection.

[0007] In some embodiments, the socket and the plug also respectively include a cable introduced into the shell and electrically connected to the core body, and a stuffing sleeve, a sealing ring, a compression gasket and a tail end cover are arranged in sequence from the inside to the outside of the shell and sleeved on the cable. The tail end cover is connected to the threaded explosion-proof connection at the rear of the shell, and the stuffing sleeve is filled with a casting body that forms a cast-in seal for the cable, and a flameproof joint surface is formed between the outer wall of the stuffing sleeve and the inner wall of the shell.

[0008] In certain embodiments, the encapsulation body is made of AB type explosion-proof clay filler, and the length of the encapsulation body is ≥20 mm.

[0009] In certain embodiments, the length L of the flameproof joint surface is ≥12.5 mm, and the maximum gap ic is ≤0.15 mm.

[0010] In some embodiments, the cores of the socket and the plug are detachably connected to the corresponding cables.

[0011] In some embodiments, the inner end of the cable has a first electrical contact portion, and the core has a second electrical contact portion that interferes with and cooperates with the first electrical contact portion.

[0012] In some embodiments, the first electrical contact portion is positioned in the housing via a support sheet, and the core is also positioned in the housing, so that the first electrical contact portion can be stably matched with the second electrical contact portion in a one-to-one correspondence.

[0013] In certain embodiments, the explosion-proof connector further comprises a ring housing rotatably disposed on one of the socket housing and the plug housing, wherein the ring housing is engaged with the other of the socket housing and the plug housing through an explosion-proof thread.

[0014] The scope of this utility model is not limited to technical solutions formed by a specific combination of the above-mentioned technical features, but also includes other technical solutions formed by any combination of the above-mentioned technical features or their equivalents. For example, technical solutions formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

[0015] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: the present invention provides an explosion-proof connector, after the pin or socket on the core body passes through the corresponding inner end sleeve and is axially plugged in and matched, an inner pressure ring is pressed on the edge of the corresponding inner end sleeve and fixed to the shell with screws, so that the core body is stably fixed between the inner end sleeve and the shell in the axial and circumferential directions, avoiding loosening caused by repeated plugging and unplugging between the pin and the socket. The plugging and unplugging process is stable, sparks are not easily generated, and it is safer to use. At the same time, by removing the screws, the internal situation of the core body can be checked, which is convenient for maintenance and inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of an explosion-proof connector;

[0017] Figure 2 Schematic diagram of the cross section of an explosion-proof connector (Example 1);

[0018] Figure 3 Schematic diagram of the cross section of an explosion-proof connector (Example 2);

[0019] Figure 4 It is a cross-sectional diagram of the socket protection cover and plug protection cover of the explosion-proof connector;

[0020] in:

[0021] 1. Socket; 11. Socket housing; 12. Socket core; 121. Socket sleeve; 13. Socket inner end sleeve; 14. Socket inner pressure ring; 15. Socket filler sleeve; 16. Socket sealing ring; 17. Socket compression gasket; 18. Socket tail cover; 19. Socket encapsulation body;

[0022] 1', plug; 11', plug housing; 12', plug core; 121', pin; 13', plug inner end sleeve; 14', plug inner pressure ring; 15', plug stuffing sleeve; 16', plug sealing ring; 17', plug compression gasket; 18', plug tail cover; 19', plug encapsulation body;

[0023] 2. Ring shell;

[0024] 3. Socket protection cover; 3'. Plug protection cover. DETAILED DESCRIPTION

[0025] As attached Figure 1-3 The explosion-proof connector shown includes a socket 1 and a plug 1 ′ that can be plugged into each other.

[0026] Example 1: Figure 2As shown, the socket 1 includes a socket housing 11 and a socket core 12 disposed within the socket housing 11. One side of the inner cavity of the socket housing 11 further comprises a socket inner end sleeve 13 covering the socket core 12, and a socket inner pressure ring 14 pressed onto the edge of the socket inner end sleeve 13 and screwed to the socket housing 11. The socket core 12 is fixed between the socket inner end sleeve 13 and the inner step of the socket housing 11. That is, the insert sleeve 121 on the socket core 12 passes through the socket inner end sleeve 13 and is axially plugged in and fitted with each other. The socket inner pressure ring 14 is then pressed onto the edge of the socket inner end sleeve 13 and screwed to the socket housing 11, thereby ensuring that the socket core 12 is stably fixed between the socket inner end sleeve 13 and the step of the socket housing 11 in both the axial and circumferential directions.

[0027] Socket 1 also includes a cable that is introduced into the socket housing 11 from the other side of the inner cavity and electrically connected to the socket core 12. Inside the socket housing 11, arranged from the inside out, are a socket filler sleeve 15, a socket sealing ring 16, a socket compression gasket 17, and a socket tail cover 18, which fit over the cable. The tail cover 18 is threaded with a flameproof connection to the rear end of the socket housing 11. The filler sleeve 15 is filled with a socket encapsulation 19 that forms a cast-in seal around the cable. The outer wall of the filler sleeve 15 forms a flameproof interface with the inner wall of the socket housing 11, providing enhanced flameproofing and facilitating disassembly.

[0028] The structure of the plug 1 ′ is similar to that of the socket 1 .

[0029] Specifically, the plug 1' comprises a plug housing 11' and a plug core 12' disposed within the housing 11'. One side of the inner cavity of the housing 11' further comprises an inner plug sleeve 13' that covers the plug core 12', and an inner plug pressure ring 14' that is pressed against the edge of the inner plug sleeve 13' and screwed to the housing 11'. The plug core 12' is secured between the inner plug sleeve 13' and a stepped portion within the housing 11'. Specifically, the pins 121' of the plug core 12' pass through the inner plug sleeve 13' and axially engage with the sleeve 121. The plug core 12' is also secured and fixed axially and circumferentially between the inner plug sleeve 13' and the stepped portion of the housing 11'.

[0030] The plug 1' also includes a cable that is introduced into the plug housing 11' from the other side of the inner cavity and electrically connected to the plug core 12'. The plug housing 11' is provided with a plug stuffing sleeve 15', a plug sealing ring 16', a plug pressing gasket 17' and a plug tail cover 18' from the inside to the outside and is sheathed on the cable.

[0031] The plug tail end cover 18' is connected to the tail end of the plug housing 11' by a threaded explosion-proof connection. The plug stuffing sleeve 15' is filled with a plug encapsulation body 19' that forms a cast-in seal for the cable. The outer wall of the plug stuffing sleeve 15' and the inner wall of the plug housing 11' form a explosion-proof joint surface, which also has a better explosion-proof effect and is easy to disassemble.

[0032] In this embodiment, the socket encapsulation body 19 and the plug encapsulation body 19 ′ are both made of AB type explosion-proof clay filler, and their lengths are both ≥20 mm.

[0033] The length L of the flameproof joint surface formed between the socket 1 and the plug 1 ′ is ≥ 12.5 mm, and the maximum gap ic is ≤ 0.15 mm.

[0034] In this embodiment, the inner end of the cable is fixedly and electrically connected to the corresponding socket core 12 and plug core 12' by welding. When the core needs to be replaced or repaired, the screws, inner pressure ring, and inner end cover are removed in sequence, the core is pulled out, the cable is disconnected by electric welding, and the core is replaced and re-welded and fixed. The inner end cover and inner pressure ring are installed in sequence, and finally fixed with screws. The entire structural components are stably matched, the safety factor is higher, and it is more suitable for IIC level explosion-proof occasions.

[0035] The explosion-proof connector further comprises a ring housing 2 rotatably arranged on the plug housing 11 ′, and the ring housing 2 is engaged with the socket housing 11 by explosion-proof threads.

[0036] Example 2: Figure 3 As shown, the difference between this embodiment and the first embodiment is that the socket core 12 and the cable, as well as the plug core 12 ′ and the cable can be connected in a quick-release manner.

[0037] The inner cavities of the socket housing 11 and the plug housing 11' are respectively provided with support plates for anti-rotation, and the inner ends of the corresponding cables have first electrical contacts, which are arranged on the support plates, so that each support plate is uniquely positioned in the socket housing 11 and the plug housing 11'.

[0038] Both the socket core 12 and the plug core 12' have a second electrical contact portion that interferes with the first electrical contact portion. The socket core 12 and the plug core 12' are also positioned in the socket housing 11 and the plug housing 11' by a limit portion to prevent rotation. Therefore, after assembly, the first electrical contact portion can stably match the second electrical contact portion one by one, so that the socket core 12 and the plug core 12' form a quick-release installation with a contact-type electrical connection with the inner end of the corresponding cable, which is convenient for maintenance or replacement of the core.

[0039] When the core needs to be replaced or repaired, the screws, inner pressure ring, and inner end cover are removed in sequence, and the socket core 12 or plug core 12' can be directly pulled out and replaced with a new core. The new socket core 12 or plug core 12' can be aligned and placed into the inner cavity of the corresponding socket shell 11 and plug shell 11', and the inner end cover and inner pressure ring are installed in sequence. Finally, the screws are fixed to complete the replacement, which is more convenient for maintenance.

[0040] like Figure 4 As shown, the explosion-proof connector further comprises a socket protective cover 3 and a plug protective cover 3 ′, as well as a socket chain connecting the socket protective cover 3 with the socket housing 11 , and a plug chain connecting the plug protective cover 3 ′ with the plug housing 11 ′.

[0041] The socket protective cover 3 includes a socket cover for closing the inner end of the socket shell 11 and a socket protective ring adapted to the outer peripheral shape of the socket shell 11. The inner periphery of the socket protective ring is threadedly matched with the outer periphery of the socket shell 11. Similarly, the plug protective cover 3' includes a plug cover for closing the inner end of the plug shell 11' and a plug protective ring adapted to the outer peripheral shape of the plug shell 11'. The outer periphery of the plug protective ring is threadedly matched with the inner periphery of the ring shell 2. The socket protective cover 3 and the plug protective cover 3' are added. When the explosion-proof plug is separated from the explosion-proof socket, the explosion-proof socket and the explosion-proof plug are sealed to protect and dust-proof their internal structures. The existing threads on the outer periphery of the socket shell 11 and the plug shell 11' are reasonably utilized for locking, making the structure more compact. When the explosion-proof socket and the explosion-proof plug are mated, the socket protective cover 3 and the plug protective cover 3' can be screwed together.

[0042] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those familiar with the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the spirit of the present invention are intended to be included in the scope of protection of the present invention.

Claims

1. An explosion-proof connector, comprising a socket and a plug that can be plugged together, wherein the socket and the plug each comprise a housing and a core disposed inside the housing, characterized in that: The socket and the plug also respectively include an inner end sleeve covering the corresponding core body, an inner pressure ring pressed on the edge of the inner end sleeve and fixed to the shell with screws, and the core body is clamped and fixed between the inner end sleeve and the shell.

2. The explosion-proof connector according to claim 1, characterized in that: The socket and the plug also respectively include a cable introduced into the shell and electrically connected to the core body. A stuffing sleeve, a sealing ring, a compression gasket and a tail end cover are arranged in sequence from the inside to the outside of the shell and sleeved on the cable. The tail end cover is connected to the threaded explosion-proof connection at the rear of the shell. The stuffing sleeve is filled with a casting body that forms a cast-in seal for the cable. A flameproof joint surface is formed between the outer wall of the stuffing sleeve and the inner wall of the shell.

3. The explosion-proof connector according to claim 2, characterized in that: The encapsulation body is made of AB type explosion-proof clay filler, and the length of the encapsulation body is ≥20mm.

4. The explosion-proof connector according to claim 2, characterized in that: The length L of the flameproof joint surface is ≥12.5 mm, and the maximum gap ic is ≤0.15 mm.

5. The explosion-proof connector according to claim 4, characterized in that: The cores of the socket and the plug are detachably connected to the corresponding cables.

6. The explosion-proof connector according to claim 5, characterized in that: The inner end of the cable has a first electrical contact portion, and the core has a second electrical contact portion that contacts and cooperates with the first electrical contact portion.

7. The explosion-proof connector according to claim 6, characterized in that: The first electrical contact portion is positioned in the housing through a support sheet, and the core is also positioned in the housing, so that the first electrical contact portion can be stably matched with the second electrical contact portion in a one-to-one correspondence.

8. The explosion-proof connector according to claim 1, characterized in that: The explosion-proof connector further comprises a ring housing rotatably arranged on one of the socket housing and the plug housing, and the ring housing is engaged with the other of the socket housing and the plug housing through an explosion-proof thread.

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