High-voltage direct current contactor with arc extinguishing grid

Abstract

The utility model discloses a high-voltage direct current contactor with an arc extinguishing grid, which relates to the field of direct current contactor structures, and comprises a shell, a conductive plate and arc extinguishing equipment, an accommodating cavity is arranged in the shell, and a power connection column is arranged on the shell; the current-conducting plate is arranged in the accommodating cavity, and the current-conducting plate is arranged corresponding to the position of the power connection column; the arc extinguishing device is arranged in the containing cavity and located on one side of the power connection column and the current-conducting plate, the electric arc is divided into multiple sections of short arcs connected in series through the current-conducting plate and the arc extinguishing device, and electric arc reignition is effectively restrained.

Description

Technical Field

[0001] This application relates to the field of DC contactor structure, and more particularly to a high-voltage DC contactor with an arc-extinguishing grid. Background Technology

[0002] In recent years, with the development of the new energy industry, high-voltage DC contactors, as core control components of power systems, have been widely used in electric vehicles, renewable energy storage, rail transit, and other fields. Their core function is to safely disconnect high-current circuits. If a user encounters an emergency requiring charging interruption, pressing the emergency stop button will cause the charging station to disconnect the charging circuit under high current and voltage conditions (equivalent to switching the high-voltage DC contactor under load, referred to as an electrical life test in high-voltage DC contactor verification testing). At this time, an electric arc is generated between the moving and stationary contacts inside the high-voltage DC contactor. Due to the high energy of the arc, unlike traditional AC systems, DC circuits lack the zero-crossing characteristic of current, resulting in an arc with high energy, long duration, and difficulty in natural extinguishing. If the arcing time is too long, it can lead to product explosion, causing damage to the product, the charging station, and even personal injury or death. Especially in high-voltage scenarios (such as above 1000V), the high temperature and ionization effect of the arc can easily cause contact erosion, insulation degradation, or even equipment explosion, seriously threatening system reliability.

[0003] Furthermore, with the increasing power density of high-voltage DC systems, contactors need to complete the breaking process in a shorter time (milliseconds). However, existing arc-extinguishing structures, due to their single heat dissipation path and slow arc energy dissipation, cannot meet the requirements for rapid breaking. Therefore, there is an urgent need for a high-voltage DC contactor that combines rapid arc breaking, efficient cooling, and precise magnetic field guidance to improve breaking capacity and equipment reliability. Utility Model Content

[0004] To address the problems existing in the prior art, this utility model provides a high-voltage DC contactor with an arc-extinguishing grid, comprising:

[0005] The outer casing has an accommodating cavity inside, and a power terminal is provided on the outer casing;

[0006] A conductive plate is disposed within the accommodating cavity, and the conductive plate is positioned corresponding to the position of the electrical contact post;

[0007] An arc-extinguishing device is disposed within the accommodating cavity, and the arc-extinguishing device is located on one side of the power-connecting post and the conductive plate.

[0008] Optionally, in some embodiments of this application, two terminals are provided, and the two terminals are partially located within the accommodating cavity;

[0009] The conductive plate is located at one end of the two electrical terminals, and a gap is formed between the conductive plate and the electrical terminals.

[0010] Optionally, in some embodiments of this application, multiple arc-extinguishing devices are provided, and the multiple arc-extinguishing devices are respectively located on both sides of the conductive plate. Each arc-extinguishing device is provided with a first current-leading plate corresponding to the position of the power-connecting post, and each arc-extinguishing device is provided with a second current-leading plate corresponding to the position of the conductive plate.

[0011] Optionally, in some embodiments of this application, the first lead plate is connected to the arc extinguishing device, and the first lead plate is provided with a first grid.

[0012] Optionally, in some embodiments of this application, the second lead plate is connected to the arc extinguishing device, and a second grid is formed on the second lead plate.

[0013] Optionally, in some embodiments of this application, the arc extinguishing device is provided with a main grid, which connects the first grid and the second grid.

[0014] Optionally, in some embodiments of this application, a third grille is further provided on the main grille, the third grille being connected to the main grille and provided corresponding to adjacent main grilles.

[0015] Optionally, in some embodiments of this application, magnets are also provided, and two magnets are provided, with the two magnets respectively located at both ends of the conductive plate.

[0016] Optionally, in some embodiments of this application, two arc-extinguishing devices are provided, with the two arc-extinguishing devices respectively located on both sides of the conductive plate.

[0017] Optionally, in some embodiments of this application, the conductive plate and the arc-extinguishing device are covered with an arc-extinguishing cover.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1. A multi-layer composite structure consisting of a main grid, a first / second lead-in grid, and a third grid is adopted to divide the electric arc into multiple short arcs connected in series, effectively suppressing arc reignition;

[0020] 2. The symmetrically arranged permanent magnets of opposite polarities at both ends of the conductive plate form a uniform strong magnetic field (magnetic field strength ≥ 50mT) perpendicular to the direction of arc movement in the contact breaking area, which drives the arc to move rapidly toward the arc extinguishing grid through the Lorentz force. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A schematic diagram of the overall structure of a high-voltage DC contactor with an arc-extinguishing grid provided in an embodiment of this application;

[0023] Figure 2 A side cross-sectional view of a high-voltage DC contactor with an arc-extinguishing grid provided in an embodiment of this application;

[0024] Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle;

[0025] Figure 4 This is a schematic diagram of the internal structure of a high-voltage DC contactor with an arc-extinguishing grid provided in an embodiment of this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 100. Outer shell; 110. Receiving cavity; 120. Electrical contact post; 130. Gap; 140. Fixing part; 150. Fixing post; 160. Buffer spring; 200. Conductive plate; 300. Arc extinguishing device; 310. First electrical contact plate; 311. First grid; 320. Second electrical contact plate; 321. Second grid; 330. Main grid; 340. Third grid; 400. Magnet; 500. Arc extinguishing cover. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this application. It is understood that the accompanying drawings are provided for reference and illustration only, and are not intended to limit this application. The connection relationships shown in the accompanying drawings are only for clear description and do not limit the connection method.

[0029] Specifically, such as Figure 1-4As shown in the embodiment of this application, a high-voltage DC contactor with an arc-extinguishing grid is provided. The contactor body is provided with a housing 100, which is made of insulating material. A receiving cavity 110 is provided inside the housing 100. At the same time, a terminal post 120 is provided on the housing 100. In this embodiment of the application, two terminal posts 120 are provided, and both terminal posts 120 are partially located inside the receiving cavity 110. External wires can be connected through the two terminal posts 120 to facilitate line connection, so that the entire line can be load-tested through the high-voltage DC contactor.

[0030] A conductive plate 200 is provided within the accommodating cavity 110, with its two ends positioned corresponding to the positions of two electrical terminals 120, specifically as follows:

[0031] A fixing part 140 is provided at the bottom of the accommodating cavity 110. A fixing post 150 is provided at the middle of the fixing part 140. A buffer spring 160 is sleeved on the fixing post 150. A conductive plate 200 is provided at the top of the buffer spring 160. The conductive plate 200 is sleeved on the outside of the fixing post 150. One end of the buffer spring 160 abuts against the fixing part 140, and the other end of the buffer spring 160 abuts against the conductive plate 200, so that the conductive plate 200 is movably mounted on the fixing post 150 by the buffer spring 160, which facilitates the setting of the corresponding electric connection post 120.

[0032] The positioning of the fixing post 150 creates a gap 130 between the conductive plate 200 and the connecting post 120. This gap 130 can generate an electric arc in the event of a power outage during circuit processing. To prevent damage to the contactor caused by the electric arc, arc-extinguishing devices 300 are installed on both sides of the conductive plate 200. The arc-extinguishing devices 300 can prevent the hazards of the electric arc. Specifically:

[0033] In this embodiment, the arc-extinguishing device 300 has multiple grids, and these grids are interconnected inside the arc-extinguishing device 300. Four arc-extinguishing devices 300 are installed within the accommodating cavity 110, each positioned on one side of the conductive plate 200. Two arc-extinguishing devices are installed on each side of the conductive plate 200, and each arc-extinguishing device 300 corresponds to a position in the gap 130. To facilitate the entry of the generated arc into the gap 130 of the arc-extinguishing device 300, magnets 400 are installed at both ends of the conductive plate 200. When an arc is formed between the conductive plate 200 and the contact post 120, the arc is lengthened by the magnets 400, making it easier for the arc to be drawn into the grids of the arc-extinguishing device 300. The lengthened arc facilitates arc switching and protects the contactor device.

[0034] Preferably, in this embodiment of the application, a first current-leading plate 310 is provided on the arc-extinguishing device 300 at a position facing the power-connecting post 120. The first current-leading plate 310 has a first grid 311. By providing the first current-leading plate 310, when an arc is generated, the arc on the power-connecting post 120 can directly enter the arc-extinguishing device 300 through the first grid 311. To facilitate the entry of the arc into the arc-extinguishing device 300, the magnet 400 can be positioned on one side of the arc-extinguishing device 300 relative to the power-connecting post 120, so that the arc is pulled into the grid on the arc-extinguishing device 300.

[0035] Preferably, in this embodiment, a second current-leading plate 320 is provided on one end of the arc-extinguishing device 300 facing the conductive plate 200. The second current-leading plate 320 has a second grid 321. By setting the second current-leading plate 320, when an arc is generated, the arc on the conductive plate 200 can directly enter the arc-extinguishing device 300 through the second grid 321. Combined with the first current-leading plate 310 and the setting in this application, the generated arc can be quickly pulled into the grid, and the length of the arc also becomes longer, turning into multiple short arcs, which is convenient for protecting the safety of the equipment.

[0036] In this embodiment of the application, the arc extinguishing device 300 is provided with a main grid 330, and the main grid 330 is connected to the first grid 311 and the second grid 321.

[0037] Preferably, in this embodiment of the application, two arc-extinguishing devices 300 are provided on the same side of the conductive plate 200, and a third grid 340 is provided at the corresponding position on the two arc-extinguishing devices 300. The third grid 340 is connected to the main grid 330 to increase the protection range of the conductive plate 200. When an electric arc is generated on the conductive plate 200 due to the disconnection of the terminal post 120, part of the electric arc is attracted by the magnet 400, causing the remaining part of the electric arc to deviate. By setting the third grid 340, the excess arc segment can be absorbed by the third grid 340.

[0038] In this embodiment, both the conductive plate 200 and the arc extinguishing device 300 are fitted with an arc extinguishing cover 500, and the receiving cavity 110 is formed inside the arc extinguishing cover 500.

[0039] The above embodiments are only used to illustrate the technical methods of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical methods of this utility model without departing from the spirit and scope of the technical methods of this utility model.

Claims

1. A high-voltage DC contactor with arc-extinguishing grid, characterized in that include: The outer casing has an accommodating cavity inside, and a power terminal is provided on the outer casing; A conductive plate is disposed within the accommodating cavity, and the conductive plate is positioned corresponding to the position of the electrical contact post; An arc-extinguishing device is disposed within the accommodating cavity, and the arc-extinguishing device is located on one side of the power-connecting post and the conductive plate; The arc-extinguishing device is provided with a first lead plate at the position corresponding to the power terminal post, and the arc-extinguishing device is provided with a second lead plate at the position corresponding to the conductive plate. The first lead plate is connected to the arc extinguishing device, and the first lead plate is provided with a first grid; The second lead plate is connected to the arc extinguishing device, and a second grid is provided on the second lead plate; The arc-extinguishing device is provided with a main grid, which connects the first grid and the second grid; A third grid is also provided on the main grid, the third grid is connected to the main grid, and the third grid is provided corresponding to the adjacent main grid.

2. A high-voltage DC contactor with arc extinguishing grid according to claim 1, characterized in that Two electrical terminals are provided, and the two electrical terminals are located within the accommodating cavity; The conductive plate is located at one end of the two electrical terminals, and a gap is formed between the conductive plate and the electrical terminals.

3. A high-voltage DC contactor with arc extinguishing grid according to claim 2, characterized in that Multiple arc-extinguishing devices are provided, and the multiple arc-extinguishing devices are respectively located on both sides of the conductive plate.

4. A high-voltage DC contactor with an arc-extinguishing grid according to claim 1, characterized in that, It is also provided with magnets, two of which are respectively located at both ends of the conductive plate.

5. A high voltage DC contactor with arc extinguishing grid according to claim 1, characterized in that, Two arc-extinguishing devices are provided, and the two arc-extinguishing devices are respectively located on both sides of the conductive plate.

6. A high voltage DC contactor with arc extinguishing grid according to claim 1, characterized in that, The conductive plate and the arc-extinguishing device are covered with an arc-extinguishing cover.

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