A labyrinth magnetic blowout arc extinguishing structure with arc extinguishing function

Abstract

The labyrinth magnetic blow arc extinguishing structure with arc extinguishing function comprises a magnetic blow arc extinguishing structure and a labyrinth arc extinguishing structure, the magnetic blow arc extinguishing structure is arranged in an arc extinguishing chamber and located at the periphery of a pair of moving contact and static contact, the magnetic blow arc extinguishing structure comprises a magnetic conducting plate, permanent magnets are arranged on the front and back of the magnetic conducting plate, and the permanent magnets provide a magnetic blow arc extinguishing magnetic field; the labyrinth arc extinguishing structure comprises a front plate and a gasket, a plate body is fixed on the gasket, the front plate is arranged on the left and right of the gasket and arranged in front and back, and the plate body of the front plate and the gasket constitutes a labyrinth structure. The labyrinth magnetic blow arc extinguishing structure with arc extinguishing function can realize quick arc extinguishing.

Description

Technical Field

[0001] This utility model relates to arc extinguishing structures, and in particular to a labyrinth-type magnetic blowout arc extinguishing structure with arc extinguishing function, which is suitable for various high-current DC relays that require arc extinguishing function. Background Technology

[0002] The electric arc generated when the contacts of a DC relay break has no natural zero-crossing point, and the arc continues to burn for a long time, requiring forced extinguishing by external force. The arc power is related to the power supply voltage and current; a continuous arc is easily generated when the contacts break. Arcs generated by high currents generally lead to high arc temperatures and high plasma concentrations, necessitating efficient arc extinguishing methods. Common arc extinguishing structures include arc-extinguishing shrouds, arc-extinguishing grids, magnetic blowout arc extinguishing, and multi-breakpoint arc extinguishing. Traditional arc extinguishing solutions rely solely on arc-extinguishing shrouds or arc-extinguishing grids to divide the arc. In high-current applications of 200A and above, the number of arc-extinguishing grids required is even greater, making it difficult to adapt to miniaturized design requirements. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a labyrinth-type magnetic blowout arc extinguishing structure with arc extinguishing function, which can realize the rapid extinguishing of electric arc.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A labyrinth-type magnetic blowout arc extinguishing structure with arc extinguishing function includes a magnetic blowout arc extinguishing structure and a labyrinth arc extinguishing structure;

[0006] The magnetic blowout arc extinguishing structure is set in the arc extinguishing chamber and is located around the paired moving contacts and stationary contacts. The magnetic blowout arc extinguishing structure includes a magnetic guide plate, and permanent magnets are installed in front of and behind the magnetic guide plate. The permanent magnets provide the magnetic blowout arc extinguishing magnetic field.

[0007] The maze arc-extinguishing structure includes a front plate and a washer, wherein a plate is fixed on the washer, the front plate is located to the left and right of the washer and arranged front and back, and the front plate and the plate of the washer constitute a maze structure.

[0008] The magnetic conductive plate is an arc-shaped plate, and the magnetic conductive plate is arranged symmetrically on the left and right sides and located outside the paired moving contacts and stationary contacts.

[0009] The magnetic plate has a C-shaped structure.

[0010] The labyrinth arc-extinguishing structure is positioned between two pairs of moving contacts and stationary contacts.

[0011] The gasket is arranged in a front-to-back configuration.

[0012] The front plate is positioned at the top, while the gasket plate is positioned at the bottom.

[0013] The permanent magnet is a high-temperature resistant permanent magnet, and it is installed with opposite polarities facing each other.

[0014] This utility model provides a labyrinth-type magnetic blowout arc-extinguishing structure with arc-extinguishing function, which has the following technical effects:

[0015] 1) By adopting a magnetic blowout arc extinguishing structure, a pair of strong permanent magnets with opposite polarities are installed on each side of the moving and stationary contacts in the arc extinguishing chamber. The magnetic field generated by the permanent magnets pulls the arc generated when the moving and stationary contacts are separated away from the contacts.

[0016] 2) By adopting a labyrinth arc-extinguishing structure, according to the left-hand rule, when the magnetic field generated by the permanent magnet pulls the arc generated when the moving and stationary contacts are separated toward the middle of the arc-extinguishing chamber, the labyrinth structure can extend the arc path and achieve the arc-extinguishing effect.

[0017] 3) Compared with the simple arc extinguishing method of using composite material silver contacts, this application adopts two arc extinguishing structures to achieve composite arc extinguishing. When the relay is wired and installed, there is no need to consider the direction of power current. When the moving and stationary contacts are broken, an arc is generated. Magnetic blowout arc extinguishing or composite arc extinguishing of magnetic blowout arc extinguishing + labyrinth arc extinguishing can pull the arc away from the moving and stationary contacts in time, so as to play a role in rapid arc extinguishing. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0019] Figure 1 This is a top view of the present invention.

[0020] Figure 2 for Figure 1 Cross-sectional view at point AA.

[0021] Figure 3 for Figure 1 Cross-sectional view at point BB.

[0022] Figure 4 This is a bottom view of the present invention (with some structures removed).

[0023] Figure 5 This is a schematic diagram of the installation of the magnetic blowout arc extinguishing structure in this utility model.

[0024] Figure 6 This is a schematic diagram of the installation of the labyrinth arc-extinguishing structure in this utility model.

[0025] Figure 7 This is a schematic diagram of the structure of this utility model (viewed from below).

[0026] In the diagram: 1. Magnetic plate; 2. Moving contact; 3. Stationary contact; 4. Permanent magnet; 5. Terminal; 6. Front plate; 7. Washer; 8. Arc extinguishing chamber; 9. Relay. Detailed Implementation

[0027] like Figure 1-4As shown, a labyrinth-type magnetic blowout arc extinguishing structure with arc extinguishing function is installed inside a relay 9. The relay 9 has paired moving contacts 2 and stationary contacts 3. A magnetic blowout arc extinguishing structure and a labyrinth arc extinguishing structure are provided within the arc extinguishing chamber 8 of the relay 9.

[0028] The magnetic blowout arc extinguishing structure includes a magnetic guide plate 1, which is used to connect the permanent magnets 4 on the front and rear sides of the moving contact 2 and the stationary contact 3. The permanent magnets 4 are high-temperature resistant permanent magnets, which are installed opposite to each other to provide a magnetic field for the magnetic blowout arc extinguishing.

[0029] The labyrinth arc-extinguishing structure includes a front plate 6 and washers 7. Washers 7 are installed in the middle of the arc-extinguishing chamber 8, and paired moving contacts 2 and stationary contacts 3 are located on both sides of the arc-extinguishing chamber 8. Washers 7 have plates extending outwards from both the front and rear. The front plates 6 are arranged to the left and right of the washers 7, with the front plates 6 positioned higher and the plates of the washers 7 positioned lower. The front plates 6 and washers 7 partially overlap on one side of the projection surface, and the plates of the front plates 6 and washers 7 form a labyrinth structure.

[0030] Terminal 5 connects to the external power supply harness, and permanent magnets 4, which are installed opposite each other on both sides of the magnetic plate 1, generate a magnetic field.

[0031] Working principle and process: When the moving contact 2 and stationary contact 3 of the relay separate, an electric arc is generated. The permanent magnet generates a strong magnetic field. The electric arc is affected by the Lorentz force formed by the strong magnetic field, deviates from the position of the moving contact 2 and stationary contact 3 and is stretched. The current flow formed by the external wiring will cause two motion states of the electric arc.

[0032] Case 1: According to the left-hand rule, when the current flows in from the left and out from the right, the arc pulls the moving contact 2 and the stationary contact 3 away from both sides of the front plate 6.

[0033] At this time, the electric arc, affected by the strong magnetic field, is pulled away from the moving and stationary contacts and approaches the surface of the cold magnetic plate 1. There is a huge temperature difference between the cold magnetic plate 1 and the electric arc. When the electric arc contacts the surface of the magnetic plate 1, the heat is quickly lost through heat conduction. When the temperature of the electric arc drops below the ionization threshold, the number and activity of charged particles in the electric arc will be significantly reduced. The reduction of charged particles leads to a decrease in the stability of the electric arc, thereby achieving the arc extinguishing effect.

[0034] Scenario 2: According to the left-hand rule, when the current flows out from the left and in from the right, the arc, influenced by the magnetic force, is pulled away from the moving contact 2 and the stationary contact 3 by the labyrinth structure in the middle of the forward plate 6. Due to the labyrinth's obstructing effect, the pulled-away arc is forced to change direction multiple times, obstructing the paths of both arcs and stretching them. The stretched arc voltage increases, the arc energy disperses, and finally, it contacts the labyrinth structure, cools, and extinguishes.

Claims

1. A labyrinth-type magnetic blowout arc-extinguishing structure with arc-extinguishing function, characterized in that: Including magnetic blowout arc extinguishing structure and labyrinth arc extinguishing structure; The magnetic blowout arc extinguishing structure is set inside the arc extinguishing chamber (8) and located around the paired moving contacts (2) and stationary contacts (3). The magnetic blowout arc extinguishing structure includes a magnetic guide plate (1), and permanent magnets (4) are installed in front of and behind the magnetic guide plate (1). The permanent magnets (4) in front and behind provide the magnetic blowout arc extinguishing magnetic field. The maze arc-extinguishing structure includes a front plate (6) and a washer (7). A plate is fixed on the washer (7), and the front plate (6) is located to the left and right of the washer (7) and arranged in front and behind. The plates of the front plate (6) and the washer (7) constitute a maze structure.

2. The labyrinth-type magnetic blowout arc-extinguishing structure with arc-extinguishing function according to claim 1, characterized in that: The magnetic plate (1) is an arc-shaped plate. The magnetic plate (1) is arranged symmetrically on the left and right sides and is located outside the pair of moving contacts (2) and stationary contacts (3).

3. The labyrinth-type magnetic blowout arc-extinguishing structure with arc-extinguishing function according to claim 2, characterized in that: The magnetic plate (1) has a C-shaped structure.

4. The labyrinth-type magnetic blowout arc-extinguishing structure with arc-extinguishing function according to claim 3, characterized in that: The labyrinth arc-extinguishing structure is positioned between two pairs of moving contacts (2) and stationary contacts (3).

5. A labyrinth-type magnetic blowout arc-extinguishing structure with arc-extinguishing function according to claim 4, characterized in that: The washer (7) is arranged in front and back of the plate.

6. The labyrinth-type magnetic blowout arc-extinguishing structure with arc-extinguishing function according to claim 5, characterized in that: The front plate (6) is arranged at the top, and the plate of the washer (7) is arranged at the bottom.

7. The labyrinth-type magnetic blowout arc-extinguishing structure with arc-extinguishing function according to claim 5, characterized in that: The permanent magnet (4) is a high-temperature resistant permanent magnet, installed with opposite polarities.

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