A high-voltage direct-current contactor arc extinguishing structure

Abstract

The utility model discloses a high -voltage direct current contactor arc extinguishing structure, specifically related to high -voltage direct current contactor technical field, including arc extinguishing cover, both sides wall of arc extinguishing cover all is provided with two permanent magnets, four contacts are still fixed on the upper end of arc extinguishing cover, and the cavity of arc extinguishing cover is provided with eight arc extinguishing angles symmetrically, the cavity of arc extinguishing cover still is provided with a plurality of locating ribs, and two contacts of same side are connected through moving contact piece, and the lower end of two moving contact pieces is commonly fixed with insulating plate. The utility model discloses a high -voltage direct current contactor arc extinguishing structure, through the cooperation design of permanent magnet and arc extinguishing angle, utilize strong magnetic field to guide arc to arc extinguishing cover high temperature area fast, and the high insulation and high temperature resistance of ceramic material are combined, realize arc to extinguish in extremely short time, and this structure effectively reduces the contact ablation, and the breaking reliability is improved significantly, ensures that the contactor is under the long -term stable operation of frequent operation.

Description

Technical Field

[0001] This utility model relates to the field of high voltage DC contactor technology, and in particular to an arc-extinguishing structure for a high voltage DC contactor. Background Technology

[0002] With the rapid development of my country's rail transit and new energy vehicle industries, the demand for high voltage and high current breaking capacity of DC contactors has been raised. Under high voltage and high current, the arc characteristics are very different from those under low voltage. The gas between the two electrodes is broken down, ionized and excited under the action of a strong electric field earlier and more violently than under low voltage.

[0003] Chinese patent document CN215955181 U discloses a high-voltage DC contactor contact arc extinguishing structure, including a flow guide port and a dividing mechanism. A pressure chamber is installed at the top of the flow guide port, and a dividing mechanism for cutting and cooling is installed at the top of the pressure chamber. The dividing mechanism includes a dividing chamber, a spring, a pressure table, an extension arm, a bearing, a pressure plate, and a dividing block. This addresses the technical problem that existing DC contactor arc extinguishing devices have relatively simple arc-extinguishing chamber structures, and their arc-extinguishing devices cannot extinguish the arc at 1500V, causing severe contactor burnout. This new high-voltage DC contactor contact arc extinguishing structure guides the arc into the pressure chamber for pressurized delivery. The gradually changing inner diameter of the cooling channel elongates and thins the arc, accelerating its extinguishing. Copper and clay grids do not affect the magnetic field generated by the permanent magnet. The clay grid has strong heat resistance, while the copper grid cools the arc faster. The iron grid at the end furthest from the permanent magnet's magnetic field also acts as an arc-initiating plate for the stationary contact.

[0004] However, in actual use, this arc-extinguishing structure cannot quickly guide the arc to the arc-extinguishing area, and cannot extinguish the arc rapidly in a very short time. Utility Model Content

[0005] The main purpose of this invention is to provide an arc-extinguishing structure for a high-voltage DC contactor, which can effectively solve the problem of the inability to extinguish the electric arc quickly in a very short time.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A high-voltage DC contactor arc extinguishing structure includes an arc extinguishing cover. Two permanent magnets are provided on both the left and right side walls of the arc extinguishing cover. Four contacts are fixed at the upper end of the arc extinguishing cover. Eight arc extinguishing angles are symmetrically arranged in the inner cavity of the arc extinguishing cover. Multiple positioning ribs are also provided in the inner cavity of the arc extinguishing cover. Two contacts on the same side are connected by moving contact pieces. An insulating plate is fixed at the lower end of the two moving contact pieces.

[0008] Preferably, the side wall of the arc-extinguishing shroud is also fixed with a support frame.

[0009] Preferably, the side wall of the arc extinguishing cover is also fixed with an anti-misalignment step, and the side wall of the permanent magnet is also provided with a notch adapted to the anti-misalignment step.

[0010] Preferably, the plurality of contacts extend downward through the arc-extinguishing shroud.

[0011] Preferably, the arc-extinguishing shroud is made of ceramic material.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] This arc-extinguishing structure, through the coordinated design of permanent magnets and arc-extinguishing angles, utilizes a strong magnetic field to rapidly guide the arc to the high-temperature region of the arc-extinguishing shroud. Combined with the high insulation and high-temperature resistance of ceramic materials, the arc is extinguished in a very short time. This structure effectively reduces contact erosion, significantly improves breaking reliability, and ensures long-term stable operation of the contactor under frequent operation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the arc-extinguishing cover and the permanent magnet of this utility model.

[0016] Figure 3 This is a schematic diagram of the internal structure of the arc-extinguishing shield of this utility model. Figure 1 ;

[0017] Figure 4 This is an exploded view of the overall structure of this utility model;

[0018] Figure 5 This is a schematic diagram of the internal structure of the arc-extinguishing shield of this utility model. Figure 2 .

[0019] In the diagram: 1. Arc extinguishing cover; 2. Permanent magnet; 3. Support frame; 4. Contact point; 5. Arc extinguishing angle; 6. Positioning rib; 7. Moving contact piece; 8. Insulating plate; 11. Anti-misalignment step. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0021] like Figure 1 - Figure 5As shown, a high-voltage DC contactor arc extinguishing structure includes an arc extinguishing cover 1. The arc extinguishing cover 1 is used to extinguish the electric arc generated when the contact 4 is broken. It is made of ceramic material. Due to the properties of ceramic, the structure has good high temperature resistance and insulation effect during use. Two permanent magnets 2 are provided on the left and right side walls of the arc extinguishing cover 1. A magnetic field is generated around the permanent magnets 2. During use, the device uses the magnetic field force to blow the arc away from the contact 4, shorten the arc burning time, reduce contact erosion, and cooperate with the arc extinguishing cover 1 to improve the arc extinguishing efficiency. The side wall of the arc extinguishing cover 1 is also fixed with a support frame 3 for limiting the permanent magnets 2 to prevent the components from loosening and ensure the accurate positioning of the magnetic field and the arc extinguishing structure. Four contacts 4 are also fixed at the upper end of the arc extinguishing cover 1, and multiple contacts 4 penetrate downward through the arc extinguishing cover 1. Two contacts 4 on the same side are a group of conductive components. When they are closed, the circuit is connected; when they are open, the circuit is disconnected.

[0022] In addition, the inner cavity of the arc extinguishing cover 1 is symmetrically equipped with eight arc extinguishing angles 5. The arc extinguishing angles 5 are used to guide the direction of the electric arc. Through their interaction with the permanent magnet 2, the electric arc enters the arc extinguishing area, optimizes the arc path, reduces contact erosion, and improves arc extinguishing reliability. The inner cavity of the arc extinguishing cover 1 is also equipped with multiple positioning ribs 6. The multiple positioning ribs 6 are used for precise positioning between components to avoid misalignment, which would lead to a decrease in arc extinguishing efficiency or damage. The two contacts 4 on the same side are connected by a moving contact piece 7. The moving contact piece 7 is a movable conductive component that works with the contact 4 to realize the circuit opening and closing. The lower ends of the two moving contact pieces 7 are fixed with an insulating plate 8. The insulating plate 8 is used to isolate the conductive component from other structures to prevent short circuits.

[0023] Furthermore, to facilitate the installation of the permanent magnet 2, the side wall of the arc extinguishing cover 1 is also fixed with an anti-misalignment step 11, and the side wall of the permanent magnet 2 is also provided with a notch that matches the anti-misalignment step 11. When the permanent magnet 2 is installed, the notch and the anti-misalignment step 11 cooperate with each other to prevent the components from being misaligned during installation, ensuring the precise relative position of the permanent magnet 2 and the arc extinguishing cover 1, and improving the magnetic field effect of the permanent magnet 2.

[0024] The specific implementation of this embodiment is as follows: The arc extinguishing structure of the high-voltage DC contactor takes the arc extinguishing cover 1 as the main frame, and two pairs of permanent magnets 2 are fixed on both sides by support frames 3. The permanent magnets 2 are precisely positioned by anti-misalignment steps 11. Eight sets of arc extinguishing angles 5 are symmetrically arranged in the inner cavity of the arc extinguishing cover 1, which, together with the positioning ribs 6, form an airflow guiding structure. Four contacts 4 penetrate vertically through the top of the arc extinguishing cover 1 and are connected into two sets of conductive units by moving contact pieces 7. An insulating plate 8 is fixed at the lower end of the moving contact piece 7. When the contacts 4 break, the magnetic field generated by the permanent magnets 2 blows the arc towards the arc extinguishing angles 5. The arc extinguishing cover 1 isolates the arc through its high temperature resistance. The positioning ribs 6 ensure the installation accuracy of each component. The anti-misalignment steps 11 prevent the permanent magnets 2 from being installed off-center. The whole system achieves rapid arc extinguishing, extended contact life, and reliable insulation under high voltage conditions.

[0025] It should be noted that the specific installation methods, circuit connection methods, and control methods of the permanent magnet 1, contact 4, and moving contact 7 in this utility model are all conventional designs, and will not be described in detail in this utility model.

Claims

1. A high-voltage DC contactor arc-extinguishing structure, comprising an arc-extinguishing cover (1), characterized in that: The arc-extinguishing cover (1) has two permanent magnets (2) on both the left and right sides. The arc-extinguishing cover (1) also has four contacts (4) fixed at the top. The arc-extinguishing cover (1) has eight symmetrical arc-extinguishing angles (5) in its inner cavity. The arc-extinguishing cover (1) also has multiple positioning ribs (6) in its inner cavity. The two contacts (4) on the same side are connected by a moving contact piece (7). The lower ends of the two moving contact pieces (7) are fixed with an insulating plate (8).

2. The arc-extinguishing structure for a high-voltage DC contactor according to claim 1, characterized in that: The arc-extinguishing cover (1) is also fixed with a support frame (3) on its side wall.

3. The arc-extinguishing structure for a high-voltage DC contactor according to claim 1, characterized in that: The side wall of the arc extinguishing cover (1) is also fixed with an anti-displacement step (11), and the side wall of the permanent magnet (2) is also provided with a notch that matches the anti-displacement step (11).

4. The arc-extinguishing structure for a high-voltage DC contactor according to claim 1, characterized in that: Multiple contacts (4) extend downward through the arc extinguishing shield (1).

5. The arc-extinguishing structure for a high-voltage DC contactor according to claim 1, characterized in that: The arc-extinguishing cover (1) is made of ceramic material.

Images