Junction box for explosion-proof motor

Abstract

The utility model discloses a junction box for an explosion-proof motor, and belongs to the field of explosion-proof motor auxiliary equipment. The top surface of the box body is open, a plurality of vertical wiring bolts are installed on the bottom surface in a penetrating manner, vertical grounding bolts are installed on the bottom surface in a penetrating manner, the first ends of the wiring bolts are arranged in the box body, the second ends of the wiring bolts extend out of the box body, the side wall of the box body is provided with a wire passing port, and the wire passing port penetrates through the top end of the box body; the box cover is buckled on the top surface of the box body, the box cover covers the top surface of the box body, and the bottom surface of the box cover blocks the top end of the wire passing port to form a mounting channel for mounting the wire holder; the wiring seat comprises a wiring box seat installed in the installation channel, the outer wall of the wiring box seat abuts against the inner wall of the wire passing opening, the top end of the outer wall of the wiring box seat abuts against the bottom face of the box cover, and the wiring box seat is coaxially provided with a wire passing channel communicated with the inner cavity of the box body. Therefore, the junction box of the explosion-proof three-phase asynchronous motor has good explosion-proof capability.

Description

Technical Field

[0001] The utility model relates to the field of explosion-proof motor auxiliary equipment, and specifically, to a junction box for an explosion-proof motor. Background Art

[0002] Explosion-proof three-phase asynchronous motors are used in places with explosive gas environments as driving motors.

[0003] For the junction box of an explosion-proof three-phase asynchronous motor, when designing the structure of the motor, it is necessary to fully consider that explosive mixtures in the use environment invade the interior of the motor, and an explosion occurs due to some reason without causing an explosion of the explosive mixture outside the motor. It is necessary to start from key conditions such as meeting the strength of the motor housing, the gap or diameter difference and length of the explosion-proof joint surface between the components forming the housing, and restricting the surface of the housing from reaching a dangerous temperature to determine the explosion-proof performance of the motor. Content of the Utility Model

[0004] The purpose of the utility model is to provide a junction box for an explosion-proof motor to achieve the purpose of having good explosion-proof ability for the junction box of an explosion-proof three-phase asynchronous motor.

[0005] To achieve the above purpose, the utility model adopts the following technical means:

[0006] A junction box for an explosion-proof motor, comprising:

[0007] A box body, with an open top surface, and a number of vertical wiring bolts and a vertical grounding bolt are inserted and installed at the bottom surface. The first end of the wiring bolt is located inside the box body, and the second end of the wiring bolt extends out of the box body. A wire passing port is provided on the side wall of the box body, and the wire passing port penetrates through from the top end of the box body;

[0008] A box cover, which is buckled and arranged on the top surface of the box body, covers the top surface of the box body, and the bottom surface of the box cover seals the top end of the wire passing port to form an installation channel for installing a wiring seat;

[0009] The wiring seat includes a wiring box seat installed in the installation channel. The outer wall of the wiring box seat abuts against the inner wall of the wire passing port, the top end of the outer wall of the wiring box seat abuts against the bottom surface of the box cover, and the wiring box seat is coaxially configured with a wire passing channel communicating with the inner cavity of the box body.

[0010] Preferably, a receiving plate is provided on the top side of the outer wall of the box body, and the side edge of the box cover is detachably connected to the receiving plate by a first bolt.

[0011] Furthermore, a lock washer is provided between the bolt head of the first bolt and the top surface of the box cover.

[0012] Further, a stepped surface is provided on the inner wall of the junction box seat. The stepped surface faces the side away from the box body. A sealing ring is coaxially arranged in the junction box seat. The outer wall of the sealing ring fits against the inner wall of the junction box seat. One end of the sealing ring abuts against the stepped surface, and the other end abuts against a junction box hopper.

[0013] Further, the connection terminal includes a connecting pipe threadedly connected to the junction box seat and an inlet pipe coaxially communicating with the connecting pipe. A metal washer is provided between the end of the connecting pipe and the sealing ring.

[0014] Further, the Shore hardness of the sealing ring is 45-55HD. The sealing ring is made of rubber material, and a number of concentric circles with different radii are coaxially arranged on the sealing ring.

[0015] During the use of the utility model, the following beneficial effects are achieved:

[0016] Through the snap connection between the box cover and the box body, and the connection seat is installed in the wire passing port, and under the action of the box cover, the connection seat is stably clamped and pressed in the installation channel. In this way, not only the stable installation of the connection seat can be realized, but also the sealing at the connection position between the connection seat and the whole box body can be improved. Thus, the explosion medium from the outside can be prevented from entering the junction box. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the utility model.

[0018] Wherein, 1-box body, 2-wiring bolt, 3-grounding bolt, 4-wire passing port, 5-box cover, 6-junction box seat, 7-bearing plate, 8-first bolt, 9-stepped surface, 10-sealing ring, 11-junction box hopper, 12-connecting pipe, 13-inlet pipe, 14-metal washer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the utility model. Usually, the components of the embodiments of the utility model described and shown here can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the present invention claimed, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts fall within the scope of protection of the present invention.

[0021] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0022] It should be noted that like reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0023] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply 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 to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "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 communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0025] Please refer to Figure 1 As shown in the figure, a junction box for an explosion-proof motor includes:

[0026] A box body 1 with an open top surface, and a plurality of vertical wiring bolts 2 are inserted and installed at the bottom surface, and a vertical grounding bolt 3 is also inserted and installed. The first end of the wiring bolt 2 is arranged inside the box body 1, and the second end of the wiring bolt 2 extends out of the box body 1. A wire passing port 4 is provided on the side wall of the box body 1, and the wire passing port 4 penetrates from the top end of the box body 1;

[0027] The box cover 5 is snap - fitted on the top surface of the box body 1. The box cover 5 covers the top surface of the box body 1, and the bottom surface of the box cover 5 seals the top end of the wire - passing port 4, forming an installation channel for installing the wiring base.

[0028] The wiring base includes a wiring box seat 6 installed in the installation channel. The outer wall of the wiring box seat 6 abuts against the inner wall of the wire - passing port 4. The top end of the outer wall of the wiring box seat 6 abuts against the bottom surface of the box cover 5. The wiring box seat 6 is coaxially configured with a wire - passing channel communicating with the inner cavity of the box body 1.

[0029] In this way, through the snap - fit connection of the box cover 5 and the box body 1, and the wiring base is installed in the wire - passing port 4. Under the action of the box cover 5, the wiring base is stably clamped and pressed in the installation channel. This can not only achieve the stable installation of the wiring base, but also improve the sealing of the connection position between the wiring base and the entire box body 1, thus preventing the external explosion - prone medium from entering the junction box.

[0030] Furthermore, a receiving plate 7 is provided on the top side of the outer wall of the box body 1. The side edge of the box cover 5 is detachably connected to the receiving plate 7 by a first bolt 8.

[0031] And, a lock washer is provided between the bolt head of the first bolt 8 and the top surface of the box cover 5.

[0032] In this way, to ensure the explosion - proof performance of the shell, the connection - used first bolt 8 is equipped with a lock washer to prevent the first bolt 8 from loosening by itself. After the first bolt 8 and the screw hole are tightened, the metal thickness around the screw hole is not less than 1 / 3 of the thread diameter, but at least 3 mm.

[0033] Furthermore, a step surface 9 is provided on the inner wall of the wiring box seat 6. The step surface 9 faces away from the box body 1. A sealing ring 10 is coaxially provided in the wiring box seat 6. The outer wall of the sealing ring 10 fits with the inner wall of the wiring box seat 6. One end of the sealing ring 10 abuts against the step surface 9, and the other end abuts against a wiring box bucket 11.

[0034] At the same time, the wiring bucket includes a connecting pipe 12 threadedly connected to the wiring box seat 6 and an inlet pipe 13 coaxially communicating with the connecting pipe 12. A metal washer 14 is provided between the end of the connecting pipe 12 and the sealing ring 10.

[0035] Furthermore, the Shore hardness of the sealing ring 10 is 45 - 55HD. The sealing ring 10 is made of rubber material, and several concentric circles with different radii are coaxially provided on the sealing ring 10.

[0036] Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A junction box for an explosion-proof motor, characterized in that: include: A box body (1) is provided with an open top surface, and a plurality of vertical connection bolts (2) are inserted and installed on the bottom surface, and a vertical grounding bolt (3) is also inserted and installed, the first end of the connection bolt (2) is arranged in the box body (1), and the second end of the connection bolt (2) protrudes from the box body (1), and the side wall of the box body (1) is provided with a wire opening (4), and the wire opening (4) passes through the top of the box body (1); A box cover (5) is buckled onto the top surface of the box body (1), the box cover (5) covers the top surface of the box body (1), and the bottom surface of the box cover (5) blocks the top of the wire passage (4), forming an installation channel for installing the wiring seat; The wiring seat comprises a wiring box seat (6) which is inserted into the installation channel, the outer wall of the wiring box seat (6) abuts against the inner wall of the wire passage opening (4), the top of the outer wall of the wiring box seat (6) abuts against the bottom surface of the box cover (5), and the wiring box seat (6) is coaxially structured with a wire passage communicating with the inner cavity of the box body (1).

2. The explosion-proof motor junction box according to claim 1, characterized in that: A receiving plate (7) is provided on the top side of the outer wall of the box body (1), and the side edge of the box cover (5) is detachably connected to the receiving plate (7) via a first bolt (8).

3. The explosion-proof motor junction box according to claim 2, characterized in that: An anti-loosening washer is provided between the bolt head of the first bolt (8) and the top surface of the box cover (5).

4. The explosion-proof motor junction box according to claim 1, characterized in that: The inner wall of the junction box seat (6) is provided with a step surface (9), the step surface (9) faces the side facing away from the box body (1), a sealing ring (10) is coaxially provided inside the junction box seat (6), the outer wall of the sealing ring (10) is in contact with the inner wall of the junction box seat (6), one end of the sealing ring (10) is in contact with the step surface (9), and the other end is in contact with a junction box bucket (11).

5. The explosion-proof motor junction box according to claim 4, characterized in that: The junction box bucket (11) comprises a connecting pipe (12) threadedly connected to the junction box seat (6), and an inlet pipe (13) coaxially connected to the connecting pipe (12), and a metal gasket (14) is provided between the end of the connecting pipe (12) and the sealing ring (10).

6. The explosion-proof motor junction box according to claim 5, characterized in that: The Shore hardness of the sealing ring (10) is 45-55 HD, the sealing ring (10) is made of rubber, and a plurality of concentric circles with different radii are coaxially arranged on the sealing ring (10).

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