A sealed explosion-proof connector

Abstract

The sealed explosion-proof connector comprises a plug and a socket, the plug comprises an explosion-proof cylinder, a lower plug shell, an upper plug shell and a plug base assembly, the plug base assembly is provided with a connector inside and is connected with a cable; the lower end of the explosion-proof cylinder is in a cylindrical shape and is on the plug base assembly; the upper plug shell is connected with the lower plug shell to form an integrated body, and the explosion-proof cylinder, the plug base assembly and the cable are wrapped in the integrated body formed by the upper plug shell and the lower plug shell. Through the implementation of the application, the structure of the explosion-proof cylinder is increased, the outer surface of the explosion-proof cylinder and the inner surface of the upper plug shell form an explosion-proof flame passage, the three elements of explosion-proof are met, explosion-proof between the two is realized, epoxy resin is used for pouring in the explosion-proof cylinder, the base assembly and the epoxy resin effectively fill and seal the cavity where the electric spark of the connector is generated, the space for storing explosive gas or dust is greatly reduced, and the explosion energy is reduced.

Description

Technical Field

[0001] This invention belongs to the field of electrical connector technology, and specifically relates to a sealed explosion-proof connector. Background Technology

[0002] With the continuous development of electrical connectors, their functions are constantly being improved. Electrical connectors for petroleum, chemical, dust, and natural gas applications are particularly complex. In the marine and terrestrial oil and chemical explosive environments, the most important performance requirement is that electrical connectors have explosion-proof capabilities. At the same time, explosion-proof connectors and components not only need to meet the requirements of airtightness and watertightness, but also require the connectors themselves to have the ability to prevent fooling, corrosion, and grounding protection, as well as the ability to withstand special working conditions and live operation due to misoperation. These are all key issues that need to be addressed in the existing technology.

[0003] Connectors naturally generate static electricity and experience shell corrosion during prolonged use and in corrosive environments. Furthermore, in the event of a connector malfunction, the shell may become electrified. To prevent these issues, explosion-proof connectors and robust safety designs for live operation are crucial. These designs effectively prevent electric shock to operators, ensuring safe product use and personnel safety. For example, patent CN216145836U discloses a grounding-protected explosion-proof plug that uses a rigid contact method for electrical connection to the shell, with an elastic spring between the grounding contact and the shell. Patent CN105742887A discloses an explosion-proof electrical connector, but it fails to incorporate explosion-proof design or application within the connector itself, focusing only on the explosion-proof surfaces of the shell, base, and contacts. However, it does not address the potential or direct sources of explosion that could cause the connector to explode. Meanwhile, the electrical characteristics of plugs and sockets are high current and high voltage. When plugs and sockets are connected, separated, or have poor electrical contact, electric arcs are easily generated. When the seal is not tight, the electric arcs can cause the explosive gases or dust inside the internal cavity of the plug and socket explosion-proof connector to explode, which will greatly reduce the safety performance of the connector. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a sealed explosion-proof connector, which forms an explosion-proof flame passage by setting an explosion-proof cylinder on the housing of the plug and the cable.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides a sealed explosion-proof connector, comprising: a first connector including a first housing extending in a front-rear direction and a first base assembly installed within the first housing, wherein a first conductive contact is installed at the front end of the first base assembly; and a second connector including a second housing extending in a front-rear direction and a second base assembly installed within the second housing, wherein a second conductive contact is installed at the rear end of the second base assembly; wherein a sleeve is installed on the outside of one of the first housings and the second housing, and an annular groove is formed between the inner wall and the outer wall of the sleeve; the front end wall of the first housing extends forward relative to the first conductive contact to form an explosion-proof groove; When the first connector and the second connector are connected, they have an initial docking state and a fully docked state. When the first connector and the second connector are in the initial docking state, at least a portion of the other housing of the first housing and the second housing extends into the annular groove so that the walls of the first housing and the second housing fit together to form an annular explosion-proof surface, and the outer wall of the second base assembly fits together with a portion of the inner wall of the explosion-proof groove to form an explosion-proof cavity. When the first connector and the second connector are in the fully docked state, the first conductive contact and the second conductive contact fit together, and the second base assembly fills the explosion-proof cavity.

[0007] Furthermore, the first connector and the second connector are mating; when the first connector is a socket, the second connector is a plug, and when the first connector is a plug, the second connector is a socket.

[0008] Furthermore, the first conductive contact and the second conductive contact are in a mating relationship. When the first conductive contact is a pin, the second conductive contact is a slot, and when the first conductive contact is a slot, the second conductive contact is a pin.

[0009] Furthermore, when the first connector is a socket, the second connector is a plug, the first conductive contact is a pin, and the second conductive contact is a slot, the front end wall of the second housing extends forward relative to the second conductive contact to form an explosion-proof groove; the outer wall of the first base assembly fits against a portion of the inner wall of the explosion-proof groove to form an explosion-proof cavity.

[0010] Furthermore, the first housing is provided with an annular step. When the sleeve is connected to the first housing and the second housing, the upper end of the sleeve is engaged with the annular step provided on the first housing, the lower part is fitted onto the outer wall of the second housing, and is connected to the second housing by threads.

[0011] Furthermore, the first housing, the second housing, the first base assembly, and the second base assembly are made of arc-extinguishing material.

[0012] Furthermore, the first connector also includes an explosion-proof cylinder and a third housing. The lower end of the explosion-proof cylinder is cylindrical and rests on the first base assembly. The third housing is connected to the first housing as a whole, and the explosion-proof cylinder, the first base assembly, and the cable are wrapped in the assembly formed by the third housing and the first housing.

[0013] Furthermore, the explosion-proof cylinder, the first conductive contact, and the second conductive contact are sealed to the corresponding wire connections with epoxy resin.

[0014] Furthermore, the outer surface of the third housing is provided with an inner groove, and the inner surface of the second housing is provided with an outward protrusion key adapted thereto. When the first connector is connected to the second connector, the outward protrusion key provided on the inner surface of the second housing is embedded in the inner groove provided on the outer surface of the third housing.

[0015] The beneficial effects of this invention are as follows: By implementing this invention, an explosion-proof cylinder structure is added, so that its outer surface and the inner surface of the plug housing form an explosion-proof flame path, satisfying the three elements of explosion-proof while achieving explosion-proof between the two. At the same time, the explosion-proof cylinder supports the plug base assembly, achieving axial fixation of the plug base assembly. This enables live separation and live plugging / unplugging in the connector structure. Furthermore, epoxy resin is used for potting inside the explosion-proof cylinder to prevent the problem of electric arc ignition of explosive gases or dust between the wires and contacts. Moreover, the base assembly and epoxy resin effectively fill and seal the cavity of the connector that generates electric sparks, greatly reducing the space for storing explosive gases or dust and reducing the energy of the explosion. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the structure of the relevant components at the initial docking stage of the present invention;

[0018] Figure 3 This is a schematic diagram of the structure of the relevant components during the docking process of the present invention;

[0019] Figure 4 This is a schematic diagram of the structure of the relevant components when the docking is completed according to the present invention;

[0020] In the diagram: 1-Connector 1, 2-Second connector 2, 101-Explosion-proof cylinder 3, 102-Third housing 4, 1021-Explosion-proof groove 5, 1022-Explosion-proof cavity 6, 103-First housing 7, 104-First base assembly 8, 105-Sleeve 9, 1051-Annular groove 1052-Annular explosion-proof surface 106-First locking sleeve 107-Second locking sleeve 101-Second housing 202-Second base assembly 105-Cable 10 Detailed Implementation

[0021] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0022] like Figure 1-4 As shown, a sealed explosion-proof connector includes: a first connector 1, including a first housing 103 extending in a front-rear direction and a first base assembly 104 installed within the first housing 103, with a first conductive contact mounted at the front end of the first base assembly 104; and a second connector 2, including a second housing 201 extending in a front-rear direction and a second base assembly 202 installed within the second housing 201, with a second conductive contact mounted at the rear end of the second base assembly 202; wherein a sleeve 105 is installed on the outside of one of the housings of the first housing 103 and the second housing 201, and an annular groove 1051 is formed between the inner wall and the outer wall of the sleeve 105; the front end wall of the first housing 103 extends forward relative to the first conductive contact. To form an explosion-proof groove 1021; when the first connector 1 and the second connector 2 are connected, they have an initial docking state and a fully docking state; when the first connector 1 and the second connector 2 are in the initial docking state, at least a portion of the other housing of the first housing 103 and the second housing 201 extends into the annular groove 1051 so that the walls of the first housing 103 and the second housing 201 fit together to form an annular explosion-proof surface 1052, and the outer wall of the second base assembly 202 fits together with a portion of the inner wall of the explosion-proof groove 1021 to form an explosion-proof cavity 1022; when the first connector 1 and the second connector 2 are in the fully docking state, the first conductive contact and the second conductive contact fit together, and the second base assembly 202 fills the explosion-proof cavity 1022.

[0023] The first connector 1 and the second connector 2 are mating. When the first connector 1 is a socket, the second connector 2 is a plug, and when the first connector 1 is a plug, the second connector 2 is a socket.

[0024] The first conductive contact and the second conductive contact are mating. When the first conductive contact is a pin, the second conductive contact is a slot, and when the first conductive contact is a slot, the second conductive contact is a pin.

[0025] When the first connector 1 is a socket, the second connector 2 is a plug, the first conductive contact is a pin, and the second conductive contact is a slot, the front wall of the second housing 201 extends forward relative to the second conductive contact to form an explosion-proof groove 1021; the outer wall of the first base assembly 104 is fitted with a portion of the inner wall of the explosion-proof groove 1021 to form an explosion-proof cavity 1022.

[0026] The first housing 103 is provided with an annular step. When the sleeve 105 is connected to the first housing 103 and the second housing 201, the upper end of the sleeve 105 is stuck on the annular step provided on the first housing 103, and the lower part is sleeved on the outer wall of the second housing 201 and connected to the second housing 201 by threads.

[0027] The first housing 103, the second housing 201, the first base assembly 104, and the second base assembly 202 are made of arc-extinguishing material.

[0028] The first connector 1 also includes an explosion-proof cylinder 101 and a third housing 102. The lower end of the explosion-proof cylinder 101 is cylindrical and rests on the first base assembly 104. The third housing 102 is connected to the first housing 103 as a whole, and the explosion-proof cylinder 101, the first base assembly 104 and the cable 3 are wrapped in the assembly formed by the third housing 102 and the first housing 103.

[0029] The explosion-proof cylinder 101, the first conductive contact and the second conductive contact are sealed to the corresponding wire connection points with epoxy resin.

[0030] It also includes a first locking sleeve 106 and a second locking sleeve 107. The lower part of the second locking sleeve 107 is sleeved on the outer surface of the first housing 103, and the upper part is wrapped around the outside of the cable 3. The lower part of the first locking sleeve 106 is sleeved on the outer surface of the second locking sleeve 107, and the upper part is embedded in the outer surface of the cable 3.

[0031] The outer surface of the third housing 102 is provided with an inner groove, and the inner surface of the second housing 201 is provided with an outward protrusion key that is adapted to it. When the first connector 1 is connected to the second connector 2, the outward protrusion key provided on the inner surface of the second housing 201 is embedded in the inner groove provided on the outer surface of the third housing 102.

[0032] The docking process is as follows Figure 2-4As shown, at the beginning of the docking, the outer explosion-proof surface (outer surface) of the first housing 102 gradually mates with the inner explosion-proof surface (inner surface) of the second housing 201. At least a portion of the other housing of the first housing 103 and the second housing 201 extends into the annular groove 1051 so that the walls of the first housing 103 and the second housing 201 fit together to form an annular explosion-proof surface 1052. At this time, the connectors have not yet made contact. With further docking, the outer wall of the second base assembly 202 fits with part of the inner wall of the explosion-proof groove 1021 to form an explosion-proof cavity 1022. When docking is in place, the first connector 1 and the second connector 2 are in a fully docked state, the first conductive contact and the second conductive contact are docked together, and the second base assembly 202 fills the explosion-proof cavity 1022. When separating, the process is reversed. This process ensures that the product always has the explosion-proof function during the insertion and removal process (the insertion and removal process of the contact), so the product can be electrically inserted and removed. Meanwhile, the contact and separation processes of the contact components are all achieved by the thread of the sleeve 105 driving the external thread of the third housing 102 to realize the axial movement of the first connector 1 and the second connector 2. During this separation process, the first connector 1 and the second connector 2 are still threadedly connected, which serves to fix them axially.

[0033] Existing explosion-proof connectors primarily demonstrate their explosion-proof (explosion-proof) performance through parameters such as temperature, explosion-proof rating, and protection level. Their explosion-proof performance is mainly reflected by parameters such as the length of the explosion-proof surface of the housing and the gap between the explosion-proof surfaces. However, they fail to analyze the root causes of explosions, such as electric arcs and sparks. This invention achieves live separation and live insertion / removal in the connector structure. Furthermore, the base assembly and epoxy resin effectively fill and seal the cavity of the connector that generates electric sparks, greatly reducing the space for storing explosive gases or dust and reducing the energy of the explosion.

Claims

1. A sealed explosion-proof connector, characterized in that, include: The first connector includes a first housing extending in a front-rear direction and a first base assembly installed within the first housing, wherein a first conductive contact is installed at the front end of the first base assembly. as well as The second connector includes a second housing extending in a front-rear direction and a second base assembly installed within the second housing, wherein a second conductive contact is installed at the rear end of the second base assembly; In this configuration, a sleeve is installed on the outside of one of the first and second housings, and an annular groove is formed between the inner wall and the outer wall of the sleeve; the front end wall of the first housing extends forward relative to the first conductive contact to form an explosion-proof groove. When the first connector and the second connector are connected, they have an initial docking state and a fully docked state. When the first connector and the second connector are in the initial docking state, at least a portion of the other housing of the first housing and the second housing extends into the annular groove so that the walls of the first housing and the second housing fit together to form an annular explosion-proof surface, and the outer wall of the second base assembly fits together with a portion of the inner wall of the explosion-proof groove to form an explosion-proof cavity. When the first connector and the second connector are in the fully mated state, the first conductive contact and the second conductive contact are mated to each other, and the second base assembly fills the explosion-proof cavity. The first connector further includes an explosion-proof cylinder and a third housing. The lower end of the explosion-proof cylinder is cylindrical and rests on the first base assembly. The third housing is connected to the first housing as a whole, and the explosion-proof cylinder and the first base assembly are wrapped in the assembly formed by the third housing and the first housing. The explosion-proof cylinder is sealed to the connection of the wire with epoxy resin.

2. The sealed explosion-proof connector as described in claim 1, characterized in that: The first connector and the second connector are mating; when the first connector is a socket, the second connector is a plug, and when the first connector is a plug, the second connector is a socket.

3. The sealed explosion-proof connector as described in claim 1, characterized in that: The first conductive contact and the second conductive contact are mating. When the first conductive contact is a pin, the second conductive contact is a slot, and when the first conductive contact is a slot, the second conductive contact is a pin.

4. The sealed explosion-proof connector as described in claim 2, characterized in that: When the first connector is a socket, the second connector is a plug, the first conductive contact is a pin, and the second conductive contact is a slot, the front end wall of the second housing extends forward relative to the second conductive contact to form an explosion-proof groove. The outer wall of the first base assembly is fitted with a portion of the inner wall of the explosion-proof groove to form an explosion-proof cavity.

5. The sealed explosion-proof connector as described in claim 1, characterized in that: The first housing is provided with an annular step. When the sleeve is connected to the first housing and the second housing, the upper end of the sleeve is engaged with the annular step provided on the first housing, and the lower part is fitted onto the outer wall of the second housing and connected to the second housing by threads.

6. The sealed explosion-proof connector as described in claim 1, characterized in that: The first housing, the second housing, the first base assembly, and the second base assembly are made of arc-extinguishing material.

7. The sealed explosion-proof connector as described in claim 1, characterized in that: The first conductive contact and the second conductive contact are sealed at the connection of the wire with epoxy resin.

8. The sealed explosion-proof connector as described in claim 1, characterized in that: The outer surface of the third housing is provided with an inner groove, and the inner surface of the second housing is provided with an outward protrusion key that is adapted to it. When the first connector is connected to the second connector, the outward protrusion key provided on the inner surface of the second housing is embedded in the inner groove provided on the outer surface of the third housing.

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