A dual magnetic blowout quick arc extinguishing device

Abstract

The application discloses a double magnetic blow quick arc extinguishing device, which comprises an arc extinguishing chamber, a magnetic blow assembly and a magnetic conducting assembly. The arc extinguishing chamber covers the magnetic blow assembly from the top, and the magnetic conducting assembly passes through the arc extinguishing chamber. The arc extinguishing chamber comprises a clamping block and a side plate assembly. The side plate assembly and the clamping block form a chamber wrapping the arc extinguishing grid. The side plate assembly is composed of a side plate, an arc extinguishing plate and a permanent magnet. The arc extinguishing plate is provided with an electric porcelain vertical grid. The magnetic blow assembly comprises a magnetic blow coil. One end of the magnetic blow coil is connected with a copper block through an arc leading angle, and the other end of the magnetic blow coil is connected with an arc leading block. The magnetic conducting assembly is composed of an iron core and a magnetic conducting plate. The iron core is rolled from a silicon steel strip, and the iron core and the magnetic conducting plate are wrapped with insulation materials. The arc extinguishing device of the application adopts a parallel extension design, that is, the installation direction of the arc leading angle is consistent with the arrangement direction of the arc extinguishing grid, thereby saving the height size and helping the expansion of the electric arc. The double magnetic blow structure is arranged in the arc extinguishing device, so that the electric arc is effectively lengthened before entering the arc extinguishing grid, thereby shortening the arc burning time.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of low-voltage electrical apparatus, and particularly relates to a double magnetic blow quick arc extinguishing device. BACKGROUND

[0002] Contactor is a common device in electrical control equipment, mainly used for remote control and on-off operation of power system. Since modern ships and locomotive power systems are mostly direct current circuits, the use of direct current contactor is becoming more and more widespread, and the development of power system also puts forward higher requirements for the breaking capacity of contactor.

[0003] The breaking capacity of contactor mainly depends on arc extinguishing device. The existing direct current contactor generally uses fan-shaped arc extinguishing chamber or obtuse angle arc breaking gap, but the utilization rate of arc extinguishing grid of this design is low, and a large space is needed for arranging the arc extinguishing chamber, which does not meet the development trend of miniaturization of electrical equipment. In addition, the magnetic field generated by coil or permanent magnet is needed to promote arc breaking, but the coil is difficult to be applied to small current conditions, and the permanent magnet is only suitable for one-way current conditions, both of which have limitations. SUMMARY

[0004] The purpose of the present application is to overcome the problem that the fan-shaped arc extinguishing chamber and single magnetic blow structure of the existing direct current contactor cannot meet the requirements of limited space and various working conditions, and to provide a double magnetic blow quick arc extinguishing device.

[0005] The technical scheme adopted by the present application to solve its technical problem is: a double magnetic blow quick arc extinguishing device, comprising two symmetrical magnetic blow assemblies, an arc extinguishing chamber covering the magnetic blow assemblies from top to bottom, and two magnetic conducting assemblies clamping the arc extinguishing chamber from front to back; the arc extinguishing chamber comprises two clamping blocks arranged in parallel and two side plate assemblies clamped on the upper and lower sides of the clamping blocks, the side plate assemblies and the clamping blocks form a chamber wrapping the arc extinguishing grid, the side plate assembly is composed of a side plate, an arc extinguishing plate installed in the groove of the side plate, and a permanent magnet located at the left and right ends of the arc extinguishing plate, the arc extinguishing plate has a vertical grid of electrical porcelain covering the contactor contact area; the magnetic blow assembly comprises a magnetic blow coil, one end of the magnetic blow coil is connected to a copper block through an arc leading angle, and the other end of the magnetic blow coil is connected to an arc leading block, the copper block is installed on the clamping block through silver-plated screws; the magnetic conducting assembly is composed of a core wrapped with insulating material on the inner and outer sides and a magnetic conducting plate.

[0006] The double magnetic blow quick arc extinguishing device has a neodymium iron boron material embedded into the side plate as the permanent magnet, and has sufficient interference fit allowance, the side plate fixes and welds the magnetic blow assembly in sections through multiple limiting and mounting features to prevent deviation.

[0007] Further, the permanent magnet is a cylinder, and the two permanent magnets on the side plate have the same magnetic pole opposite to each other.

[0008] The vertical grid width and interval of the double magnetic blow quick arc extinguishing device is not less than 2mm, and the depth is not less than 1.5mm, which extends from the bottom of the arc extinguishing grid to the entrance of the arc extinguishing chamber.

[0009] The magnetic blow assembly of the double magnetic blow quick arc extinguishing device is welded with the arc striking horn as a whole, and a copper block is additionally welded at the end of the arc striking horn, which provides backup for the ablation of the arc striking horn 23 caused by frequent use, and a counterbore is formed in the copper block for fixing the arc striking horn.

[0010] Further, the magnetic blow coil has inner and outer layers, and the two layers are separated by a high-temperature-resistant insulating film.

[0011] Further, the arc striking block is a bent copper plate, and the copper plate has a mounting hole, which can ensure good contact and also be used for fixing and mounting the magnetic blow assembly.

[0012] Further, the rotation direction of the iron core is consistent with the winding direction of the magnetic blow coil, so as to improve the magnetic field strength.

[0013] Compared with the prior art, the technical scheme provided by the application has the following remarkable effects:

[0014] The square arc extinguishing chamber is used, and the arc striking horn is arranged at 180°, so that the occupied space is reduced and the arc is more easily transferred to the arc extinguishing grid; the magnetic blow coil and the permanent magnet are arranged in the arc extinguishing device, and the use conditions of small current and bidirectional current are considered through the unique layout, so that the arc extinguishing is effectively accelerated, and the breaking capacity of the contactor is improved in the limited space.

[0015] When small current is broken, the arc is difficult to be transferred from the contact to the arc striking horn, the vertical magnetic field generated by the permanent magnet pushes the arc below to the left or right grid according to the current direction, and the arc is elongated and extinguished without using the arc striking horn; when large current is broken, the arc itself can be transferred to the arc striking horn, and the vertical magnetic field generated by the permanent magnet pushes the arc above to the grid and extends to the arc extinguishing grid, so that the arc extinguishing is effectively accelerated. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the axonometric view of the application;

[0017] Figure 2 is the axonometric view of the arc extinguishing chamber of the application;

[0018] Figure 3 is the schematic view of the side plate assembly in the application;

[0019] Figure 4 is the schematic view of the magnetic blow assembly in the application;

[0020] Figure 5is a schematic diagram of the core in the present application;

[0021] Figure 6 is a schematic diagram of the small current working condition in the present application;

[0022] Figure 7 is a schematic diagram of the large current working condition in the present application.

[0023] The reference signs are: 1 - arc extinguishing chamber, 11 - side plate assembly, 111 - side plate, 112 - arc extinguishing plate, 113 - permanent magnet, 12 - clamping block, 13 - arc extinguishing grid, 2 - magnetic blowout assembly, 21 - magnetic blowout coil, 22 - arc striking block, 23 - arc striking angle, 24 - copper block, 3 - magnetic conducting assembly. DETAILED DESCRIPTION

[0024] In order to further understand the content of the present application, the present application is described in detail in combination with the drawings.

[0025] Referring to Figure 1 The double magnetic blowout fast arc extinguishing device of the present application comprises an arc extinguishing chamber 1, a magnetic blowout assembly 2 and a magnetic conducting assembly 3. The arc extinguishing chamber 1 is covered by the two symmetrically installed magnetic blowout assemblies 2 from the top, and the magnetic conducting assembly 3 is composed of an iron core 31 and a magnetic conducting plate 32 which are coiled by silicon steel strips and wrapped with insulation materials on the inner and outer sides, and the magnetic conducting assembly 3 clamps the arc extinguishing chamber 1 from both sides.

[0026] Referring to Figure 2 and Figure 3 The arc extinguishing chamber 1 is composed of a side plate assembly 11, a clamping block 12 and an arc extinguishing grid 13. The side plate assembly 11 and the clamping block 12 are provided with mounting holes corresponding to each other, and are fastened by a screw rod to form a single-face open chamber. The side plate assembly 11 comprises a side plate 111, an arc extinguishing plate 112 and a permanent magnet 113, wherein the side plate 111 is provided with a recess for mounting the arc extinguishing plate 112 and is glued firmly by epoxy resin; the permanent magnet 113 is processed into a cylinder with a thickness of X and is pressed into a recess with a width of x, satisfying 0.02 < X-x < 0.04 mm, and the two permanent magnets 113 are opposite to each other in the same magnetic pole. The arc extinguishing plate 112 has vertical grid features, which are made of electrical porcelain, and the vertical grid extends from the bottom of the arc extinguishing grid 13 to the entrance of the arc extinguishing chamber 1, and the width and spacing of the grid are not less than 2 mm, and the depth is not less than 1.5 mm.

[0027] Referring to Figure 4As shown, the magnetic blow assembly 2 is a welded piece, obtained by brazing the magnetic blow coil 21, the arc leading block 22, the arc leading corner 23 and the copper block 24 with silver solder. The magnetic blow coil 21 has two layers, the inner and outer layers, and the two layers are separated by a high-temperature-resistant insulating film. The lead wires are welded to one end of the arc leading block 22 and the arc leading corner 23, respectively, and the welding area should not be less than half the width of the welded piece. The arc leading block 22 is bent from a copper plate, and a long through hole is opened on the upper part for adjustment during installation. It can be used for the fixed installation of the magnetic blow assembly 2 while ensuring good contact. The copper block 24 is welded to the other end of the arc leading corner 23 and has a counterbore for fixing the arc leading corner 23. The copper block 24 is installed on the clamp block 12 by silver-plated screws. After welding, the surface of the coil is sandblasted to remove dirt and oxidation layer to avoid reducing the conductivity.

[0028] Referring to Figure 5 As shown, the iron core is formed by die molding. The middle part is obtained by winding a 0.23mm thick silicon steel strip, and the inner and outer parts are made of insulating material 4330-2 to ensure insulation with the magnetic blow coil 21. During installation, the rotation direction of the iron core is consistent with the winding direction of the magnetic blow coil to improve the magnetic field strength.

[0029] Referring to Figure 6 As shown, when the working circuit is in a small current condition, the electric force of the arc itself is insufficient to transfer to the arc leading corner 23, the magnetic blow coil 21 cannot be connected, and the blowout magnetic field cannot be generated. Assuming that the N-pole of the permanent magnet 113 is inwardly installed at this time, the magnetic field direction at the arc is downward, and since the current direction is from left to right, the arc is subjected to the ampere force inwardly to the paper, and is pushed to the inner arc extinguishing plate 112, and is elongated by the vertical grid to promote its extinction.

[0030] Referring to Figure 7 As shown, when the working circuit is in a large current condition, the electric force of the arc itself is sufficient to quickly transfer to the arc leading corner 23, which is located above the permanent magnet 113. Assuming that the N-pole of the permanent magnet 113 is inwardly installed at this time, the magnetic field direction at the arc is upward, and since the current direction is from left to right, the arc is subjected to the ampere force outwardly to the paper, and is pushed to the outer arc extinguishing plate 112, and is elongated by the vertical grid. At the same time, the arc connects the magnetic blow coil 21, generating a larger magnetic field toward the inside of the paper, and the arc is subjected to another larger ampere force upwardly, so the arc will move upwardly along the vertical grid to the back of the arc extinguishing grid 13 and then continue to move upwardly, and then be extinguished.

[0031] The above embodiments only exemplarily illustrate the principles and effects of the present application, and part of the embodiments are used. Those skilled in the art can make several modifications and improvements without departing from the inventive concept, which are all within the protection scope of the present application.

Claims

1. A dual magnetic blow fast arc extinguishing device, characterized in that: The application relates to a magnetic blowout device, which comprises two symmetrically-installed magnetic blowout components (2), an arc-extinguishing chamber (1) covering the magnetic blowout components (2) and two magnetic conducting components (3) clamping the arc-extinguishing chamber (1) from two sides; the arc-extinguishing chamber (1) comprises two clamping blocks (12) and two side plate components (11) clamped on the upper and lower sides of the clamping blocks (12), the side plate components (11) and the clamping blocks (12) form a chamber wrapping an arc-extinguishing grid (13), the side plate component (11) is composed of a side plate (111), an arc-extinguishing plate (112) installed in a groove of the side plate (111) and permanent magnets (113) located at the left and right ends of the arc-extinguishing plate (112), the arc-extinguishing plate (112) is provided with vertical ceramic grids; the magnetic blowout component (2) is integrally welded by a magnetic blowout coil (21) and an arc leading angle (23), one end of the magnetic blowout coil (21) is connected with a copper block (24) through the arc leading angle (23), the other end of the magnetic blowout coil (21) is connected with an arc leading block (22), the arc leading angle (23) is welded with the copper block (24) at the end, the copper block (24) is provided with a counterbore, and the copper block (24) is installed on the clamping block (12); the magnetic conducting component (3) is composed of a silicon steel strip and a magnetic conducting plate, the arc-extinguishing chamber (1) is square and is provided with the arc leading angle (23) arranged at 180 degrees.

2. A dual magnetic blow-out fast arc extinguishing device according to claim 1, characterized in that, The permanent magnets (113) are Nd-Fe-B materials embedded into the side plate (111), and the side plate (111) is fixed with the magnetic blowout component (2) by a plurality of limiting pieces.

3. A dual magnetic blow-out fast arc extinguishing device according to claim 2, characterized in that, The permanent magnets (113) are cylindrical, and the two permanent magnets (113) on the side plate (111) are opposite to each other in the same magnetic pole.

4. A dual magnetic blow-out fast arc extinguishing device according to claim 1 or 2 or 3, characterized in that, The vertical grids have a width and a spacing not less than 2mm and a depth not less than 1.5mm, and extend from the bottom of the arc-extinguishing grid (13) to the entrance of the arc-extinguishing chamber (1).

5. A dual magnetic blow-out fast arc extinguishing device according to claim 4, characterized in that, The magnetic blowout coil (21) has inner and outer layers, and the two layers are separated by a high-temperature-resistant insulation film.

6. A dual magnetic blow-out fast arc extinguishing device according to claim 4, characterized in that, The arc leading block (22) is a bent copper plate, and the copper plate is provided with a mounting hole.

7. The dual magnetic blow-out fast arc extinguishing device according to claim 4, characterized in that, The rotating direction of the iron core is consistent with the winding direction of the magnetic blowout coil (21).

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