No-spark explosion-proof plug and socket connecting terminal

Abstract

The utility model provides a sparkless explosion-proof plug and socket connecting terminal, which comprises a male terminal and a female terminal, one end of the male terminal is provided with a plugging part, one end of the female terminal is provided with a sleeving part, the sleeving part is internally provided with a plugging cavity, the surface of the sleeving part is provided with a pressure relief hole, the pressure relief hole is communicated with the interior of the plugging cavity, and a torsion spring sleeve is embedded in the plugging cavity. A plurality of clamping grooves are distributed in the front end of the inner wall of the inserting cavity in an annular array mode along the axis, a plurality of clamping blocks are distributed on the surfaces of the two ends of the torsional spring sleeve in an annular array mode along the axis, and the clamping blocks are clamped and embedded into the clamping grooves respectively. When plating is carried out, pressure relief is carried out on the interior of the insertion cavity through the pressure relief hole, and the influence of the pressure in the insertion cavity when plating is sprayed and filled is avoided; the torsional spring sleeve is arranged, so that the insertion and extraction force between the female terminal and the male terminal can be improved; and a plurality of clamping and embedding blocks are clamped and embedded into a plurality of clamping and embedding grooves, so that a multi-point supporting and fixing effect on the torsion spring sleeve is achieved, and the problem that the insertion and extraction force is reduced due to collapse deformation of the torsion spring after long-time use is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of explosion-proof plug sockets, and particularly relates to a connection terminal of a non-sparking explosion-proof plug socket. Background Art

[0002] A non-sparking explosion-proof plug socket is a safe electrical connector designed specifically for flammable and explosive environments. Through special designs, such products can avoid generating electric arcs or sparks during the plugging and unplugging processes, thereby preventing fire or explosion accidents in working environments containing explosive gases and dust. They generally comply with relevant national explosion-proof standards, use shell materials that block the propagation of explosion flames, and built-in explosion-proof components to ensure both safe and reliable electrical connections.

[0003] As Figure 6 shown is a schematic structural diagram of a conventional female terminal of a non-sparking explosion-proof plug socket. Multiple slots are provided on the front surface of the socket part of the female terminal, such that the front end of the socket part of the female terminal forms a claw-like structure to clamp the plug part of the male terminal. However, under long-term use, the claws of the socket part are prone to deformation, resulting in a decrease in the plugging and unplugging force. Moreover, due to the presence of multiple slots, the contact area between the female terminal and the male terminal is relatively small, which not only fails to ensure the plugging and unplugging force but also has poor electrical conductivity. Additionally, under the existing technology, terminals need to be plated during production. Since the inner rear end of the socket part of the female terminal is a sealed structure, during the spraying of the plating layer, it is affected by the air pressure inside the plugging cavity. The air pressure will hold back the spraying of the plating layer material, making it impossible for the plating layer to evenly cover the inner wall surface of the plugging cavity, bringing more inconveniences to production and processing. Summary of the Utility Model

[0004] The utility model aims to provide a connection terminal of a non-sparking explosion-proof plug socket to solve the problems raised in the above background art.

[0005] To achieve the above object, the utility model provides the following technical solutions:

[0006] A connection terminal of a non-sparking explosion-proof plug socket, comprising a male terminal and a female terminal, characterized in that: one end of the male terminal is provided with a plug part, one end of the female terminal is provided with a socket part, an insertion cavity is arranged inside the socket part, a pressure relief hole is arranged on the surface of the socket part, the pressure relief hole is internally communicated with the insertion cavity, a torsion spring sleeve is embedded in the insertion cavity, a plurality of clamping grooves are arranged on the front end of the inner wall of the insertion cavity in a circumferential array along the axis, and a plurality of clamping blocks are arranged on the surfaces of both ends of the torsion spring sleeve in a circumferential array along the axis. The plurality of clamping blocks are respectively clamped into the plurality of clamping grooves.

[0007] Preferably, a male terminal wiring part is arranged at one end of the male terminal away from the plug part.

[0008] Preferably, a female terminal wiring part is provided at one end of the female terminal away from the socket part.

[0009] Preferably, the socket part is an integral hollow cylindrical structure.

[0010] Preferably, the cross-section of the clamping block is a wedge-shaped structure, and the clamping groove is a wedge-shaped groove.

[0011] Advantageous effects

[0012] One or more of the above technical solutions in the sparkless explosion-proof plug and socket connection terminal provided by the embodiment of the present utility model at least have one of the following technical effects:

[0013] By means of the above technical solutions of the present utility model, when plating treatment is carried out, the inside of the insertion cavity is depressurized through the pressure relief hole, so as to avoid being affected by the internal pressure of the insertion cavity when spraying the plating layer, and enable the plating layer to uniformly cover the inner wall surface of the insertion cavity; by providing a torsion spring sleeve inside the insertion cavity, the insertion and extraction force between the female terminal and the male terminal can be improved, and the contact area between the female terminal and the male terminal can be increased, so that the conductivity is better; and by clamping a plurality of clamping blocks into a plurality of clamping grooves, a multi-point support and fixation effect can be achieved on the torsion spring sleeve, avoiding problems such as the torsion spring sleeve shrinking and deforming after long-term use, resulting in a decrease in the insertion and extraction force, and improving the reliability. Description of the drawings

[0014] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0015] Figure 2 It is a schematic diagram of the male terminal structure of the present utility model;

[0016] Figure 3 It is a schematic diagram of the female terminal structure of the present utility model;

[0017] Figure 4 It is a schematic diagram of the torsion spring sleeve structure of the present utility model;

[0018] Figure 5 It is a schematic diagram of the explosion structure of the present utility model;

[0019] Figure 6 It is a schematic diagram of the female terminal structure under the prior art;

[0020] The corresponding relationship between the labels of each attached drawing in the figure and the component names is as follows:

[0021] 1, male terminal; 2, female terminal; 3, insertion part; 4, socket part; 5, insertion cavity; 6, pressure relief hole; 7, torsion spring sleeve; 8, clamping groove; 9, clamping block; 10, male terminal wiring part; 11, female terminal wiring part. Detailed implementation manners

[0022] The technical solution of the present utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative work belong to the protection scope of the present utility model.

[0023] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0024] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0025] As Figures 1-6 shown, it is a schematic structural diagram of a sparkless explosion-proof plug and socket connection terminal according to a preferred embodiment of the present utility model;

[0026] In this embodiment, it includes a male terminal 1 and a female terminal 2. One end of the male terminal 1 is integrally provided with a plugging portion 3, and one end of the female terminal 2 is integrally provided with a socket portion 4. An insertion cavity 5 is provided inside the socket portion 4. A pressure relief hole 6 is provided on the surface of the socket portion 4, and the pressure relief hole 6 is internally communicated with the insertion cavity 5. The pressure relief hole 6 is used to relieve the pressure in the insertion cavity 5 to avoid being affected by the internal pressure of the insertion cavity 5 when spraying the coating. A torsion spring sleeve 7 is embedded in the insertion cavity 5, which can improve the insertion and extraction force between the female terminal 2 and the male terminal 1, and increase the contact area between the female terminal 2 and the male terminal 1, making the electrical conductivity better; a plurality of clamping grooves 8 are arranged in a circumferential array along the axis at the front end of the inner wall of the insertion cavity 5, and a plurality of clamping blocks 9 are arranged in a circumferential array along the axis on the surfaces of both ends of the torsion spring sleeve 7. The plurality of clamping blocks 9 are respectively clamped into the plurality of clamping grooves 8, which can play a role in multi-point support and fixation for the torsion spring sleeve 7, avoiding problems such as the collapse and deformation of the torsion spring sleeve 7 during long-term use, resulting in a decrease in the insertion and extraction force, and improving the reliability.

[0027] In this embodiment, a male terminal wiring portion 10 is provided at the end of the male terminal 1 away from the plugging portion 3 for connecting the male terminal 1 to an external wire.

[0028] In this embodiment, a female terminal wiring portion 11 is provided at one end of the female terminal 2 away from the socket portion 4 for connecting the female terminal 2 to an external wire.

[0029] In this embodiment, the socket portion 4 is an integrally formed hollow cylindrical structure. The use of an integral structure makes the socket portion 4 stronger and less likely to deform, and the contact area between the socket portion 4 and the insertion portion 3 is larger, resulting in better electrical conductivity.

[0030] In this embodiment, the cross-section of the clamping block 9 is a wedge-shaped structure, and the clamping groove 8 is a wedge-shaped groove. This wedge-shaped structure means that the clamping part will be pressed tighter during installation, thus improving the structural stability. Because when the wedge-shaped structure is stressed, a downward and inward component force will be generated along the inclined plane, making the contact between the clamping block 9 and the clamping groove 8 closer. And the wedge-shaped structure will achieve self-locking after reaching a certain degree, that is, without external force, the clamping block 9 will not come out of the clamping groove 8, increasing the stability of the installation and fixation.

[0031] For a connection terminal of a sparkless explosion-proof plug and socket of the present utility model, its installation method, connection method or setting method are all common mechanical methods, and any implementation that can achieve its beneficial effects can be carried out.

[0032] The technologies not described in detail in the present utility model are all well-known technologies. Those skilled in the art can easily implement the present utility model on the basis of understanding this specification, and the content shown in the drawings is a part of this specification.

[0033] The above content further elaborates on the present utility model in combination with specific implementation manners. It cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, which should all be regarded as belonging to the protection scope determined by the claims submitted for the present utility model.

Claims

1. A non-sparking explosion-proof plug and socket connection terminal, comprising a male terminal (1) and a female terminal (2), characterized in that: One end of the male terminal (1) is provided with a plugging portion (3), one end of the female terminal (2) is provided with a socket portion (4), a plugging cavity (5) is arranged inside the socket portion (4), a pressure relief hole (6) is arranged on the surface of the socket portion (4), the pressure relief hole (6) is internally communicated with the inside of the plugging cavity (5), a torsion spring sleeve (7) is embedded in the plugging cavity (5), a plurality of clamping grooves (8) are arranged on the front end of the inner wall of the plugging cavity (5) in an annular array along the axis, and a plurality of clamping blocks (9) are arranged on the surfaces of both ends of the torsion spring sleeve (7) in an annular array along the axis. The plurality of clamping blocks (9) are respectively clamped into the plurality of clamping grooves (8).

2. The connecting terminal of a sparkless explosion-proof plug and socket according to claim 1, characterized in that: One end of the male terminal (1) far from the plugging portion (3) is provided with a male terminal wiring portion (10).

3. The connection terminal of a sparkless explosion-proof plug and socket according to claim 1, characterized in that: One end of the female terminal (2) far from the socket portion (4) is provided with a female terminal wiring portion (11).

4. A non-sparking explosion-proof plug and socket connection terminal according to claim 1, characterized in that: The socket portion (4) is an integral hollow cylindrical structure.

5. The connection terminal of a sparkless explosion-proof plug and socket according to claim 1, characterized in that: The cross section of the clamping block (9) is a wedge-shaped structure, and the clamping groove (8) is a wedge-shaped groove.

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