Explosion-proof variable frequency motor lead fixer

Abstract

The utility model discloses an explosion-proof variable frequency motor lead fixing device, which relates to the technical field of explosion-proof motor junction boxes and comprises an explosion-proof junction box, a sealing assembly and a linkage assembly, the explosion-proof junction box is composed of an explosion-proof box, an explosion-proof cover and a threading hole column, and the linkage assembly is used for transmitting installation power of the explosion-proof cover to the sealing assembly to achieve sealing operation of the sealing assembly. By arranging the linkage assembly, when the explosion-proof cover is pressed on the top of the explosion-proof box, the bottom inclined face of the pressing column makes contact with the butt-joint side block and exerts extrusion force on the butt-joint side block, the butt-joint side block is made to be close to the fixed side block, at the moment, the external hole column extrudes the metal annular gasket, and the metal annular gasket extrudes the rubber sealing ring; when the explosion-proof box is installed, the rubber sealing ring deforms to block the inner cavity of the threading hole column, sealing protection of the explosion-proof box can be achieved, and compared with a traditional installation structure, the operation steps are fewer, and installation is more convenient and efficient.

Description

Technical Field

[0001] The utility model relates to the technical field of explosion-proof motor junction boxes, in particular to an explosion-proof variable frequency motor lead fixer. Background Art

[0002] Explosion-proof variable frequency motor is a kind of motor that can be used in flammable and explosive places. It does not produce electric sparks during operation. Explosion-proof motors are mainly used in coal mines, oil and gas, petrochemical and chemical industries. In addition, they are also widely used in textiles, metallurgy, city gas, transportation, grain and oil processing, papermaking, medicine and other departments.

[0003] The explosion-proof variable frequency motor uses a flameproof casing to separate the electrical parts that may generate sparks, arcs and dangerous temperatures from the surrounding explosive gas mixture. The lead wire used for explosion-proof motors is a relatively common cable product. It is the main conductive raw material for connecting the explosion-proof motor winding main line and the terminal. The connection between the lead wire and the motor terminal is sealed and protected by an explosion-proof junction box. The explosion-proof junction box is a connection device with explosion-proof and strong sealing properties. From the appearance, it is a closed box. When the lead wire passes through the outlet hole on the explosion-proof junction box, the rubber sealing ring inside the outlet hole is squeezed to make the rubber sealing ring fit tightly to the outside of the lead wire and the inner wall of the outlet hole, so that the inner cavity of the explosion-proof junction box maintains good sealing, and the outer shell of the explosion-proof junction box is usually made of aluminum alloy, which has better fire resistance and corrosion resistance.

[0004] When the lead wires are actually installed, the installation and fixing of the top shell of the explosion-proof junction box and the sealing operation of the lead hole are separate operations. In order to simplify this operation, an explosion-proof variable frequency motor lead wire fixer is provided. Utility Model Content

[0005] The purpose of the utility model is to provide an explosion-proof variable frequency motor lead fixer in order to solve the above-mentioned problems.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an explosion-proof variable frequency motor lead wire fixer, comprising an explosion-proof junction box composed of an explosion-proof box, an explosion-proof cover, and a threading hole column, wherein the explosion-proof cover is fixed to the top of the explosion-proof box by bolts, the threading hole column is fixed to one side of the outer wall of the explosion-proof box, and a threading hole is opened inside the threading hole column to penetrate into the interior of the explosion-proof box, a sealing component is arranged on the inner side of the threading hole column, and the sealing component is used to seal between the threading hole and the lead wire when the lead wire passes through the threading hole;

[0007] The explosion-proof cover, the threading hole column and the sealing component are provided with linkage components outside, and the linkage components are used to transmit the installation power of the explosion-proof cover to the sealing component to realize the sealing operation of the sealing component;

[0008] The linkage assembly includes a pre-docking unit and an extrusion unit; the pre-docking unit is used to realize the pre-docking of the sealing assembly, and the extrusion unit is used to extrude the pre-docking unit to realize the extrusion sealing of the sealing assembly.

[0009] As a further solution of the utility model: the sealing assembly includes a mounting groove, a rubber sealing ring, a metal annular gasket, and an external hole column; the mounting groove is opened at one end of the threading hole column away from the explosion-proof box and is connected to the wiring hole, the rubber sealing ring and the metal annular gasket are sequentially installed on the inner side of the threading hole column, the external hole column is sleeved on the outer side of the lead wire, and the lead wire passes through the rubber sealing ring, the metal annular gasket, and the threading hole in sequence;

[0010] The external hole column is inserted into the inner side of the installation groove to apply extrusion force to the metal ring gasket, and the metal ring gasket transmits the extrusion force to the rubber sealing ring to deform it. The rubber sealing ring fits tightly to the outer side of the lead wire, the threading hole and the inner wall of the installation groove to achieve sealing and blocking of the threading hole.

[0011] As a further solution of the utility model: the pre-docking unit includes a fixed side block, an arc-shaped limit block, and a docking side block; the fixed side blocks are symmetrically fixed to the two sides of the outer wall of the threading hole column and are located at the end of the threading hole column away from the explosion-proof box, and the arc-shaped limit block is symmetrically fixed to the end surface of one side of the two fixed side blocks away from the threading hole column;

[0012] The docking side blocks are symmetrically fixed on both sides of the outer wall of the external hole column. When the end of the external hole column is inserted into the installation groove, the docking side blocks are clamped on the inner side of the arc-shaped limiting block to realize the initial limiting of the external hole column.

[0013] As a further solution of the utility model: the extrusion unit includes a connecting arm, a positioning column, and a clamping column; the connecting arm is symmetrically fixed to one end of the outer wall of the explosion-proof cover, and the positioning column and the clamping column are symmetrically and vertically fixed to the bottom of the connecting arm. When the explosion-proof cover and the explosion-proof box are close to each other, the positioning column is fitted to one end of the fixed side block close to the explosion-proof box, and the clamping column forms an extrusion on the end face of the docking side block, which is used to provide power for the deformation of the rubber sealing ring extruded by the external hole column.

[0014] As a further solution of the utility model: the end of the bottom of the clamping column close to the positioning column is in an inclined structure, and the spacing between the positioning column and the clamping column matches the sum of the thicknesses of the fixed side block and the docking side block.

[0015] As a further solution of the utility model: a notch groove is opened on one side of the outer wall of the external hole column, and a clamping plate is installed on the inner side of the notch groove by bolts, and the clamping plate is used to clamp and fix the lead wire.

[0016] As a further solution of the utility model: the explosion-proof box, threading hole column, installation groove, fixed side block, and arc-shaped limit block are integrally formed by a casting process; the explosion-proof cover, connecting arm, positioning column, and clamping column are integrally formed by a casting process; the external hole column, notch groove, and docking side block are integrally formed by a casting process.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] By setting a linkage component, when the explosion-proof cover is pressed on the top of the explosion-proof box, the bottom inclined surface of the clamping column contacts the docking side block and gives it an extrusion force, so that the docking side block moves closer to the fixed side block. At this time, the external hole column squeezes the metal ring gasket, and the metal ring gasket squeezes the rubber sealing ring. The rubber sealing ring deforms to seal the inner cavity of the threading hole column, thereby realizing the sealing protection of the explosion-proof box. Compared with the traditional installation structure, it has fewer operating steps and is more convenient and efficient to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the utility model in a split state;

[0021] Figure 3 This is a schematic structural diagram of the utility model in a disassembled state from another viewing angle.

[0022] In the figure: 1. explosion-proof junction box; 101. explosion-proof box; 102. explosion-proof cover; 103. threading hole column; 2. sealing assembly; 201. installation groove; 202. rubber sealing ring; 203. metal ring gasket; 204. external hole column; 205. notch groove; 206. clamping plate; 3. linkage assembly; 301. fixed side block; 302. arc limit block; 303. docking side block; 304. connecting arm; 305. positioning column; 306. clamping column. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figures 1 to 3In the embodiment of the utility model, an explosion-proof variable frequency motor lead fixer includes an explosion-proof junction box 1 composed of an explosion-proof box 101, an explosion-proof cover 102, and a threading hole column 103. The explosion-proof cover 102 is fixed to the top of the explosion-proof box 101 by bolts, and the threading hole column 103 is fixed to one side of the outer wall of the explosion-proof box 101. A threading hole that penetrates into the interior of the explosion-proof box 101 is opened inside the threading hole column 103. A sealing component 2 is arranged on the inner side of the threading hole column 103. The sealing component 2 is used to seal between the threading hole and the lead wire when the lead wire passes through the threading hole.

[0025] The explosion-proof cover 102 , the threading hole column 103 and the outside of the sealing component 2 are provided with a linkage component 3 , which is used to transmit the installation power of the explosion-proof cover 102 to the sealing component 2 to realize the sealing operation of the sealing component 2 .

[0026] The linkage component 3 includes a pre-docking unit and an extrusion unit. The pre-docking unit is used to realize the pre-docking of the sealing component 2 during assembly. The extrusion unit is used to extrude the pre-docking unit to realize the extrusion sealing of the sealing component 2 .

[0027] The sealing assembly 2 includes a mounting groove 201, a rubber sealing ring 202, a metal annular gasket 203, and an external hole column 204; the mounting groove 201 is opened at one end of the threading hole column 103 away from the explosion-proof box 101 and is connected to the wiring hole, the rubber sealing ring 202 and the metal annular gasket 203 are installed on the inner side of the threading hole column 103 in sequence, the external hole column 204 is sleeved on the outer side of the lead wire, and the lead wire passes through the rubber sealing ring 202, the metal annular gasket 203, and the threading hole in sequence; the external hole column 204 is inserted into the inner side of the mounting groove 201 to apply an extrusion force to the metal annular gasket 203, and the metal annular gasket 203 transmits the extrusion force to the rubber sealing ring 202 to deform it, and the rubber sealing ring 202 fits tightly to the outer side of the lead wire, the threading hole and the inner wall of the mounting groove 201 to achieve a sealed plugging of the threading hole.

[0028] The pre-docking unit includes a fixed side block 301, an arc-shaped limit block 302, and a docking side block 303; the fixed side block 301 is symmetrically fixed on both sides of the outer wall of the threading hole column 103 and is located at the end of the threading hole column 103 away from the explosion-proof box 101, and the arc-shaped limit block 302 is symmetrically fixed on the end surface of one side of the two fixed side blocks 301 away from the threading hole column 103; the docking side block 303 is symmetrically fixed on both sides of the outer wall of the external hole column 204. When the end of the external hole column 204 is inserted into the installation groove 201, the docking side block 303 is clamped on the inner side of the arc-shaped limit block 302 to realize the preliminary limiting of the external hole column 204.

[0029] The extrusion unit includes a connecting arm 304, a positioning column 305, and a clamping column 306; the connecting arm 304 is symmetrically fixed to one end of the outer wall of the explosion-proof cover 102, and the positioning column 305 and the clamping column 306 are symmetrically and vertically fixed to the bottom of the connecting arm 304. When the explosion-proof cover 102 and the explosion-proof box 101 are close to each other, the positioning column 305 is close to one end of the fixed side block 301 close to the explosion-proof box 101, and the clamping column 306 forms an extrusion on the end face of the docking side block 303, which is used to provide power for the external hole column 204 to extrude the rubber sealing ring 202 for deformation.

[0030] The end of the bottom of the clamping column 306 close to the positioning column 305 is in an inclined structure, and the distance between the positioning column 305 and the clamping column 306 matches the sum of the thicknesses of the fixed side block 301 and the docking side block 303 .

[0031] In this embodiment, it should be additionally explained that: the bottom of the explosion-proof box 101 is provided with a through hole for the explosion-proof variable frequency motor terminal to pass through, and a mounting hole for mounting and fixing the explosion-proof box 101 and the explosion-proof variable frequency motor.

[0032] When connecting the lead wire to the explosion-proof variable frequency motor terminal, the operation steps are as follows:

[0033] First, disassemble the entire explosion-proof junction box 1 as a whole (such as Figure 2 , 3 ), then the external hole column 204, the metal ring gasket 203, and the rubber sealing ring 202 are sequentially sleeved on the outside of the lead wire, and then the lead wire is passed through the threading hole column 103 to enter the explosion-proof box 101, and then the lead wire can be connected to the corresponding wiring terminals.

[0034] Afterwards, the rubber sealing ring 202, the metal ring gasket 203, and the external hole column 204 are inserted into the installation groove 201 in sequence. At this time, the docking side block 303 is clamped on the inner side of the arc-shaped limit block 302, and there is a gap between the docking side block 303 and the fixed side block 301. The arc-shaped limit block 302 can limit the docking side block 303 to prevent it from deflecting. At this time, the preliminary installation and limiting of the external hole column 204 is completed.

[0035] Then, the explosion-proof cover 102 is pressed onto the top of the explosion-proof box 101. During this process, the positioning column 305 is aligned with the end face of the fixed side block 301. As the explosion-proof cover 102 moves downward, the bottom inclined surface of the clamping column 306 contacts the docking side block 303 and gives it an extrusion force, so that the docking side block 303 approaches the fixed side block 301. At this time, the external hole column 204 squeezes the metal annular gasket 203, and the metal annular gasket 203 squeezes the rubber sealing ring 202. The rubber sealing ring 202 deforms to seal the inner cavity of the threading hole column 103, thereby realizing the sealing protection of the explosion-proof box 101.

[0036] It should be noted that the explosion-proof cover 102 and the explosion-proof box 101 are finally brought close together by tightening the explosion-proof cover 102 and the explosion-proof box 101 together through bolts. This extrusion force is transmitted to the external hole column 204, which can meet the extrusion force required for the rubber sealing ring 202 to deform.

[0037] Please refer to Figures 1 to 3 A notch groove 205 is provided on one side of the outer wall of the external hole column 204, and a clamping piece 206 is installed on the inner side of the notch groove 205 by bolts. The clamping piece 206 is used to clamp and fix the lead wire.

[0038] In this embodiment: after the connection between the lead wire and the explosion-proof variable frequency motor terminal and the assembly of the explosion-proof junction box 1 are completed, the clamping piece 206 can be installed and fixed to the inner side of the notch groove 205 by bolts, and the clamping piece 206 tightly clamps the lead wire.

[0039] Please refer to Figures 1 to 3 The explosion-proof box 101, the threading hole column 103, the installation groove 201, the fixed side block 301, and the arc-shaped limit block 302 are integrally formed by a casting process; the explosion-proof cover 102, the connecting arm 304, the positioning column 305, and the clamping column 306 are integrally formed by a casting process; the external hole column 204, the notch groove 205, and the docking side block 303 are integrally formed by a casting process.

[0040] In this embodiment, the above structure makes the production process of the explosion-proof junction box 1 the same as the existing technical process, and only needs to replace the corresponding mold to achieve production, which is convenient for popularization of production.

[0041] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An explosion-proof variable frequency motor lead fixture, comprising an explosion-proof junction box (1) consisting of an explosion-proof box (101), an explosion-proof cover (102), and a threading hole column (103), wherein the explosion-proof cover (102) is fixed to the top of the explosion-proof box (101) by bolts, the threading hole column (103) is fixed to one side of the outer wall of the explosion-proof box (101), and a threading hole is opened inside the threading hole column (103) to penetrate into the interior of the explosion-proof box (101), characterized in that: A sealing component (2) is provided on the inner side of the threading hole column (103), and the sealing component (2) is used to seal between the threading hole and the lead wire when the lead wire passes through the threading hole; A linkage assembly (3) is distributed outside the explosion-proof cover (102), the threading hole column (103) and the sealing assembly (2), and the linkage assembly (3) is used to transmit the installation power of the explosion-proof cover (102) to the sealing assembly (2) to realize the sealing operation of the sealing assembly (2); The linkage component (3) comprises a pre-docking unit and an extrusion unit; the pre-docking unit is used to realize assembly pre-docking of the sealing component (2), and the extrusion unit is used to extrude the pre-docking unit to realize extrusion sealing of the sealing component (2).

2. The explosion-proof variable frequency motor lead fixer according to claim 1, characterized in that: The sealing assembly (2) comprises a mounting groove (201), a rubber sealing ring (202), a metal annular gasket (203), and an external hole column (204); the mounting groove (201) is formed at one end of the threading hole column (103) away from the explosion-proof box (101) and is connected to the wiring hole; the rubber sealing ring (202) and the metal annular gasket (203) are sequentially mounted on the inner side of the threading hole column (103); the external hole column (204) is sleeved on the outer side of the lead wire; and the lead wire passes through the rubber sealing ring (202), the metal annular gasket (203), and the threading hole in sequence; The external hole column (204) is inserted into the inner side of the installation groove (201) to exert a squeezing force on the metal ring gasket (203), and the metal ring gasket (203) transmits the squeezing force to the rubber sealing ring (202) to deform it. The rubber sealing ring (202) is tightly fitted to the outer side of the lead wire, the threading hole and the inner wall of the installation groove (201), thereby achieving a sealed plugging of the threading hole.

3. The explosion-proof variable frequency motor lead fixer according to claim 2, characterized in that: The pre-docking unit comprises a fixed side block (301), an arc-shaped limit block (302), and a docking side block (303); the fixed side block (301) is symmetrically fixed to two sides of the outer wall of the threading hole column (103) and is located at one end of the threading hole column (103) away from the explosion-proof box (101); the arc-shaped limit block (302) is symmetrically fixed to one side end surface of the two fixed side blocks (301) away from the threading hole column (103); The docking side blocks (303) are symmetrically fixed to the two sides of the outer wall of the external hole column (204); when the end of the external hole column (204) is inserted into the installation groove (201), the docking side blocks (303) are clamped on the inner side of the arc-shaped limiting block (302) to achieve preliminary limiting of the external hole column (204).

4. The explosion-proof variable frequency motor lead fixer according to claim 3, characterized in that: The extrusion unit comprises a connecting arm (304), a positioning column (305), and a pressing column (306); the connecting arm (304) is symmetrically fixed to one end of the outer wall of the explosion-proof cover (102); the positioning column (305) and the pressing column (306) are symmetrically and vertically fixed to the bottom of the connecting arm (304); when the explosion-proof cover (102) and the explosion-proof box (101) are close to each other, the positioning column (305) is close to one end of the fixed side block (301) close to the explosion-proof box (101); the pressing column (306) forms an extrusion on the end surface of the docking side block (303), so as to provide power for the external hole column (204) to extrude the rubber sealing ring (202) to deform.

5. The explosion-proof variable frequency motor lead fixer according to claim 4, characterized in that: The bottom end of the clamping column (306) close to the positioning column (305) is in an inclined structure, and the spacing between the positioning column (305) and the clamping column (306) matches the sum of the thicknesses of the fixed side block (301) and the docking side block (303).

6. The lead wire holder of an explosion-proof variable frequency motor according to claim 2, characterized in that: A notch groove (205) is provided on one side of the outer wall of the external hole column (204), and a clamping sheet (206) is installed on the inner side of the notch groove (205) via bolts, and the clamping sheet (206) is used to clamp and fix the lead wire.

7. The lead wire holder of an explosion-proof variable frequency motor according to claim 4, characterized in that: The explosion-proof box (101), the threading hole column (103), the installation groove (201), the fixed side block (301), and the arc-shaped limit block (302) are integrally formed by a casting process; the explosion-proof cover (102), the connecting arm (304), the positioning column (305), and the pressing column (306) are integrally formed by a casting process; and the external hole column (204), the notch groove (205), and the docking side block (303) are integrally formed by a casting process.

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