Magnetic blow-out arc extinguishing assembly for high-voltage load switch

Abstract

The utility model discloses a magnetic blow-out arc extinguishing assembly for a high-voltage load switch, which relates to the technical field of high-voltage switch accessory equipment and comprises a plastic mould frame, the plastic mould frame comprises a grid frame head and a grid frame body, the grid frame head is used for being fixedly connected with the high-voltage load switch, and a plurality of grid plate notches are sequentially arranged on the lower side of the grid frame body and used for correspondingly installing a plurality of arc extinguishing grid plates. Each arc extinguishing grid sheet is integrally in an H shape with a narrow upper part and a wide lower part, and an upper narrow opening of each arc extinguishing grid sheet is a U-shaped bayonet and is used for being clamped in the corresponding grid sheet notch in a matched manner; inverted-U-shaped arc guide channels are punched on three sides of a lower wide opening of each arc extinguishing grid piece, and a magnetic bin with an opening in one end is formed in the center of the grid frame body and used for installing a samarium-cobalt permanent magnet. According to the utility model, the overall structure is simpler, charged particles of an electric arc are deflected and extinguished by using magnetic field magnetic force generated by a single magnetic conductive sheet, the number of used magnetic conductive sheets is small, the overall occupied space of the assembly is small, the design cost is reduced, and a ring main unit high-voltage load switch structure with a smaller size can be further researched and developed.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage switch accessories, in particular to a magnetic arc blowing component for a high-voltage load switch. Background Art

[0002] High-voltage load switches are important components of high-voltage switchgear in power systems and are widely used in industrial and civil power generation and distribution systems and power supply terminals. The process of contact connection and disconnection is accompanied by gas discharge, i.e. arc. The arc energy is concentrated and the temperature is very high. In severe cases, it can cause contact welding and melting of the contact.

[0003] The existing common arc extinguishing methods include arc extinguishing grid, arc extinguishing ring, magnetic blowing, air blowing, etc. However, arc extinguishing grid and arc extinguishing ring have limited arc extinguishing capacity, and in order to achieve the desired effect, the number of arc extinguishing grid pieces and the number of arc extinguishing ring copper belts will be increased. Chinese patent publication number CN117059428B, the patent name is a high-voltage load switch using magnetic blowing composite arc extinguishing, which discloses an arc-starting closure component, which uses a permanent magnet and an arc extinguishing grid to extinguish the arc. When the moving contact is opened, the arc is blown into the gap of the arc-starting closure component under the action of magnetic force. The arc-starting closure component generates an electromagnetic force perpendicular to the arc motion trajectory. The arc is divided into multiple sections under the action of this electromagnetic force, elongated and rapidly cooled, absorbing the arc energy, forcing the arc to extinguish or the arc not to reignite after passing through zero, accelerating the arc extinguishing, and significantly improving the arc extinguishing effect. However, this arc-starting closure component adopts a double magnet structure, that is, the magnets are located on both sides of the magnetic conductive sheet, which increases the number of magnetic conductive sheets used, the overall component occupies a large space, the design process is more complicated, the cost is higher, and the size of the switch is increased, which is not conducive to use in a small and compact ring network cabinet. Utility Model Content

[0004] In order to solve the technical problems mentioned in the background technology, the utility model provides a magnetic arc extinguishing component for a high-voltage load switch.

[0005] The utility model adopts the following technical solution: a magnetic arc extinguishing assembly for a high-voltage load switch, comprising:

[0006] Plastic formwork;

[0007] The plastic mold frame includes a grid frame head and a grid frame body;

[0008] The grid head is used for fixed connection with the high-voltage load switch;

[0009] A plurality of grid slots are sequentially provided on the lower side of the grid frame body for correspondingly installing a plurality of arc extinguishing grids;

[0010] Each arc-extinguishing grid is generally in an H-shape with a narrow top and a wide bottom. The narrow opening of the arc-extinguishing grid is a U-shaped snap-in for fitting into the slot of the grid; the three sides of the wide opening of the arc-extinguishing grid are punched with an inverted U-shaped arc-guiding channel;

[0011] A magnetic bin with an opening at one end is provided in the center of the grid frame for installing samarium cobalt permanent magnets.

[0012] Furthermore, a pair of parallel mounting plates are arranged on the grid head, and mounting holes for bolt connection with the high-voltage load switch are provided on the pair of mounting plates.

[0013] Furthermore, the magnetic chamber is a rectangular cavity, and the samarium cobalt permanent magnet is a strip-shaped brick structure that matches its shape.

[0014] Furthermore, a limiting hole for inverted insertion of a plastic rivet is provided below the opening of the magnetic bin, and the plastic rivet is used to limit the samarium cobalt permanent magnet to prevent it from slipping out of the magnetic bin.

[0015] Compared with the prior art, the utility model has the following advantages: the magnetic arc blowing assembly for high-voltage load switch designed by the utility model has a magnetic bin for installing samarium cobalt permanent magnets at the upper end of the plastic mold frame, and a plurality of grid slots for installing arc extinguishing grids at the lower side. The samarium cobalt permanent magnet generates a magnetic field. When the switch is closed / opened, the charged particles in the arc vertically enter the magnetic field range. Under the action of the magnetic field, the charged particles are deflected and move to the left and right sides. Under the action of the magnetic field and the high-voltage electric field, the long arc enters the gap formed by the arc extinguishing grids and is divided into a plurality of equal short arcs. The short arcs are enclosed in the arc path of the arc extinguishing grids, and the charged ions are adsorbed and the arc is extinguished. The overall structure of the assembly is simpler, and the magnetic field magnetic force generated by a single magnetic conductive sheet is used to deflect the charged particles of the arc and then extinguish it. The number of magnetic conductive sheets used is small, and the overall assembly occupies a small space, which reduces the design cost and is also conducive to the further development of a smaller ring network cabinet high-voltage load switch structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of a magnetic arc extinguishing assembly for a high-voltage load switch of the utility model;

[0017] Figure 2 It is a schematic diagram of the overall structure of the magnetic arc extinguishing assembly for the high-voltage load switch of the utility model from another angle;

[0018] Figure 3 It is a front view of a magnetic arc extinguishing assembly for a high voltage load switch of the utility model;

[0019] Figure 4 It is a cross-sectional view of the AA plane of the magnetic arc blowing assembly for the high-voltage load switch of the utility model;

[0020] Figure 5This is a schematic diagram of the magnetic field direction distribution of the magnet of the utility model;

[0021] Figure 6 This is a schematic diagram of the installation structure of the magnet of the utility model.

[0022] in:

[0023] 1-Plastic mold frame, 2-Arc extinguishing grid, 3-Samarium cobalt permanent magnet, 4-Plastic rivet,

[0024] 11-grid slot, 12-magnetic compartment, 13-mounting plate,

[0025] 21-U-shaped arc guide channel. DETAILED DESCRIPTION

[0026] In order to facilitate those skilled in the art to understand the technical solution of the utility model, further description is now made with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model.

[0027] In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present invention. However, it is apparent that one or more embodiments may be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present invention.

[0028] It should be known that the magnetic arc blowing assembly designed in this embodiment is mainly used to extinguish the arc generated by the high-voltage load switch when opening and closing the switch. The high-voltage load switch is an important component of the high-voltage switchgear in the power system, and is widely used in industrial and civil power generation and distribution systems and power supply terminals. The process of the contacts connecting and disconnecting the current is accompanied by the phenomenon of gas discharge, i.e., the arc. The arc energy is concentrated and the temperature is very high. In severe cases, it can cause the contacts to weld and the contact points to melt. The existing commonly used arc extinguishing methods include arc extinguishing grids, arc extinguishing rings, magnetic blowing, gas blowing, etc. However, the arc extinguishing grids and arc extinguishing rings not only have limited arc extinguishing capabilities, but in order to achieve the desired effect, the number of arc extinguishing grids and the number of arc extinguishing ring copper strips will be increased.

[0029] Please combine Figure 1-4 As shown, the magnetic arc blowing assembly for high-voltage load switch of the utility model includes a plastic mold frame 1. The plastic mold frame is made of high-strength plastic material and is formed by injection molding to form a long rod shape as a whole. The plastic mold frame 1 includes a grid frame head and a grid frame body. The grid frame head is used to be fixedly connected to the high-voltage load switch, such as Figure 6As shown, it is specifically installed above the motion track of the moving knife assembly used for opening and closing the gate. When the moving knife assembly is in the process of opening and closing the gate, an arc will be generated and fall into the position range of the grid frame body. During specific installation, a pair of parallel mounting plates 13 are arranged on the head of the grid frame, and mounting holes 14 for bolting with the high-voltage load switch are provided on the pair of mounting plates 13. A number of grid slots 11 are sequentially provided on the lower side of the grid frame body for corresponding installation of a number of arc-extinguishing grids 2. The arc-extinguishing grids are made of coated steel plate materials and are formed by a stamping process. Each arc-extinguishing grid 2 is an H-shaped with a narrow upper and a wide lower shape as a whole. The narrow opening of the arc-extinguishing grid 2 is a U-shaped bayonet, which is used to fit in the grid slot 11. After the arc-extinguishing grid is pressed into the slot of the plastic mold frame, friction is generated to lock the position and it cannot slide out. An inverted U-shaped arc-guiding channel 21 is stamped on three sides of the lower wide opening of the arc-extinguishing grid 2. After the arc enters, the arc is closed and extinguished. A magnetic bin 12 with an open end is provided at the center of the grid frame body for installing the samarium cobalt permanent magnet 3. In a specific implementation, the magnetic bin 12 is a rectangular cavity, and the samarium cobalt permanent magnet 3 is a strip brick structure adapted to its shape. The samarium cobalt permanent magnet 3 is not easy to slide out of the magnetic bin 12. In a specific design, a limiting hole for inverted insertion of the plastic rivet 4 is provided below the bin opening of the magnetic bin 12, which can play a limiting and buffering role, and is used to limit the samarium cobalt permanent magnet 3 to prevent it from sliding out of the magnetic bin 12.

[0030] like Figure 5 The figure shows a schematic diagram of the magnetic field direction distribution of the magnet of the utility model. The magnetic arc blowing assembly for the high-voltage load switch designed in this embodiment has a magnetic bin for installing the samarium cobalt permanent magnet at the upper end of the plastic mold frame, and a plurality of grid slots for installing the arc extinguishing grid are arranged at the lower side. The samarium cobalt permanent magnet generates a magnetic field. When the switch is closed / opened, the charged particles in the arc vertically enter the magnetic field range. Under the action of the magnetic field, the charged particles are deflected and move to the left and right sides. Under the action of the magnetic field and the high-voltage electric field, the long arc enters the gap formed by the arc extinguishing grid and is divided into a plurality of equal short arcs. The short arc is enclosed in the arc path of the arc extinguishing grid, and the charged ions are adsorbed and the arc is extinguished. The overall structure of the assembly is simpler. The magnetic field magnetic force generated by a single magnetic conductive sheet is used to deflect the charged particles of the arc and then extinguish it. The number of magnetic conductive sheets used is small, and the overall assembly occupies a small space, which reduces the design cost and is also conducive to the further development of a smaller ring network cabinet high-voltage load switch structure.

[0031] The above embodiments are merely descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A magnetic arc extinguishing assembly for a high voltage load switch, characterized in that: include: Plastic mold frame (1); The plastic mold frame (1) comprises a grid frame head and a grid frame body; The grid head is used for fixed connection with the high-voltage load switch; A plurality of grid plate slots (11) are sequentially provided on the lower side of the grid frame body for correspondingly installing a plurality of arc extinguishing grid plates (2); Each arc-extinguishing grid (2) is in an H-shape with a narrow top and a wide bottom. The narrow top of the arc-extinguishing grid (2) is a U-shaped snap-on slot for fitting into the grid slot (11). The three sides of the wide bottom of the arc-extinguishing grid (2) are punched with inverted U-shaped arc-guiding channels (21). A magnetic bin (12) with an open end is provided in the center of the grid frame body for mounting the samarium cobalt permanent magnet (3).

2. The magnetic arc extinguishing assembly for a high voltage load switch according to claim 1, characterized in that: A pair of parallel mounting plates (13) are arranged on the grid head, and mounting holes (14) for bolt connection with the high-voltage load switch are provided on the pair of mounting plates (13).

3. The magnetic arc extinguishing assembly for a high voltage load switch according to claim 2, characterized in that: The magnetic bin (12) is a rectangular cavity, and the samarium cobalt permanent magnet (3) is a strip-shaped brick structure that matches its shape.

4. The magnetic arc extinguishing assembly for a high voltage load switch according to claim 3, characterized in that: A limiting hole for inserting a plastic rivet (4) in reverse is provided below the opening of the magnetic bin (12); the plastic rivet (4) is used to limit the samarium cobalt permanent magnet (3) to prevent it from sliding out of the magnetic bin (12).

Images