Arc extinguish chamber and switch unit thereof

Abstract

The utility model relates to the technical field of switch arc extinguish chambers, and discloses an arc extinguish chamber and a switch unit thereof, comprising a housing, a moving contact assembly rotatably arranged in the housing, a moving contact fixed on the moving contact assembly, arc extinguish chambers fixed on two sides of the moving contact assembly in the housing, and a static contact fixed on one end of each arc extinguish chamber; the arc extinguish chamber comprises a first partition plate and a second partition plate, a first gas production side plate and a second gas production side plate are arranged between the first partition plate and the second partition plate, an arc striking grid piece is fixed to one end of the arc extinguish chamber, a permanent magnet is fixed between the first gas production side plate and the first gas production side plate, and a permanent magnet is also installed between the second gas production side plate and the second partition plate. According to the utility model, the arc inlet channel of the arc extinguish chamber is reasonable in design, the speed and the uniformity of an arc entering the arc extinguish chamber can be improved, the arc extinguish performance of an arc extinguish system is good, critical small current can be broken, the influence of the wiring direction is avoided, the breaking capacity is good, and zero flashover among switch units is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of switch arc extinguishing chambers, in particular to an arc extinguishing chamber and its switch unit. Background Art

[0002] A switch unit usually consists of structures such as a moving contact, a static contact piece, and an arc extinguishing chamber. An arc will be generated when the moving contact and the static contact are switched on and off.

[0003] In the prior art, for example, in the arc extinguishing chamber and the circuit breaker with an arc extinguishing chamber disclosed in the application number: CN202211353726.4, which includes a first arc extinguishing chamber and a second arc extinguishing chamber; the first arc extinguishing chamber includes a first arc dividing plate, a second arc dividing plate, and arc extinguishing grid pieces; the arc extinguishing grid pieces are located between the first arc dividing plate and the second arc dividing plate; the first arc extinguishing chamber is clamped on the static contact of the circuit breaker; the second arc extinguishing chamber is fixed on the protrusion of the static contact and the base of the circuit breaker.

[0004] However, the arc extinguishing chamber in the switch unit mentioned in the prior art has a poor ability to quickly extinguish the arc, resulting in the ablation of the components in the switch unit by the high temperature of the arc. Moreover, in a DC switch, it is more difficult to break and extinguish the critical small current, and the switch needs to withstand a voltage of up to DC1500V. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an arc extinguishing chamber and its switch unit to solve the problems in the prior art.

[0006] The purpose of the utility model can be realized by the following technical solutions:

[0007] An arc extinguishing chamber and its switch unit, the switch unit includes a housing, a moving contact assembly is rotatably arranged in the housing, a moving contact is fixed on the moving contact assembly, arc extinguishing chambers are fixed on both sides of the moving contact assembly in the housing, and a static contact is fixed at one end of the arc extinguishing chamber;

[0008] The arc extinguishing chamber includes a first partition board and a second partition board. A gas generating side plate one and a gas generating side plate two are arranged between the first partition board and the second partition board. An arc guiding grid piece is fixed at one end of the arc extinguishing chamber. A permanent magnet is fixed between the gas generating side plate one and the gas generating side plate one, and a permanent magnet is also installed between the gas generating side plate two and the second partition board.

[0009] Further, a plurality of arc extinguishing grid piece groups are arranged between the first partition board and the second partition board. A W-shaped groove is arranged inside the arc extinguishing grid pieces, and the W-shaped grooves on two adjacent arc extinguishing grid pieces are arranged staggeredly.

[0010] Further, a narrow slit channel is formed between the gas generating side plate one and the gas generating side plate two.

[0011] Further, the first gas-producing side plate is attached to the side surface of the first partition plate, the second gas-producing side plate is attached to the side surface of the second partition plate, an arc-igniting angle is fixedly provided on the arc-igniting grid piece, and the arc-igniting angle is attached to the static contact head.

[0012] Further, the permanent magnet is located near the arc-igniting grid piece in the arc extinguishing chamber.

[0013] Further, an air duct is provided at one end of the arc extinguishing chamber away from the arc-igniting grid piece. The air duct is arranged in the housing, and a net plate for blocking the arc is fixed in the air duct.

[0014] Advantages of the present utility model:

[0015] 1. The arc extinguishing chamber and its switch unit of the present utility model are arc extinguishing chambers for photovoltaic use with DC 1500V. The design of the incoming arc channel is reasonable, which is beneficial to improving the rate and uniformity of the arc entering the arc extinguishing chamber. The arc extinguishing performance of the arc extinguishing system is good, it can break critical small current, and it is not affected by the wiring direction, and its breaking capacity is good.

[0016] 2. For the arc extinguishing chamber and its switch unit of the present utility model, the W-shaped grooves of the arc extinguishing grid pieces are arranged in a staggered manner in pairs, the narrow gap design between the gas-producing partition plate and the moving contact head, and the arrangement position and the direction of the generated magnetism of the permanent magnet make there be no arc flash between the switch units. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following further describes the present utility model with reference to the drawings.

[0018] Figure 1 is a schematic structural diagram of the switch unit of the present utility model;

[0019] Figure 2 is a schematic structural diagram inside the housing of the present utility model;

[0020] Figure 3 is a schematic structural diagram of the arc extinguishing chamber of the present utility model;

[0021] Figure 4 is a schematic structural diagram of the arc extinguishing chamber and the moving contact head of the present utility model;

[0022] Figure 5 is a schematic structural diagram of the arc extinguishing chamber of the present utility model;

[0023] Figure 6 is a schematic internal structural diagram of the arc extinguishing chamber of the present utility model;

[0024] Figure 7 is a schematic structural diagram of the moving contact head of the present utility model;

[0025] Figure 8 is a schematic diagram of the arc extinguishing system of the present utility model;

[0026] Figure 9It is a schematic diagram of the arc extinguishing system of the present utility model;

[0027] Figure 10 It is a schematic diagram of the gas flow direction in the arc extinguishing chamber of the present utility model;

[0028] Figure 11 It is a schematic diagram of the arc extinguishing structure of the switch unit of the present utility model.

[0029] The attached drawings are described as follows:

[0030] 1. Housing; 101. Air duct; 11. Mesh plate; 2. Arc extinguishing chamber; 21. Partition plate one; 22. Partition plate two; 23. Gas generating side plate one; 24. Gas generating side plate two; 25. Arcing grid; 251. Arcing angle; 26. Arc extinguishing grid group; 261. W-shaped groove; 27. Permanent magnet; 3. Static contact; 4. Moving contact assembly; 41. Moving contact. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the attached drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0032] An arc extinguishing chamber and its switch unit, as Figures 1-11 shown, wherein the switch unit includes a housing 1, a switch handle is rotatably installed on the housing 1, a moving contact assembly 4 is fixedly connected to the switch handle, a moving contact 41 is fixedly provided on the moving contact assembly 4, the moving contact assembly 4 is rotatably arranged in the housing 1, arc extinguishing chambers 2 are fixedly provided on both sides of the moving contact assembly 4 in the housing 1, a static contact 3 is installed at one end of the arc extinguishing chamber 2, and when the moving contact 41 contacts the static contact 3, arc extinguishing is carried out through the arc extinguishing chamber 2, and this arc extinguishing chamber can extinguish the arcs of large currents and critical small currents in forward wiring and reverse wiring.

[0033] The arc extinguishing chamber 2 includes a partition plate one 21 and a partition plate two 22, multiple arc extinguishing grid groups 26 are arranged between the partition plate one 21 and the partition plate two 22, a W-shaped groove 261 is formed inside the arc extinguishing grid, and the angle of the W-shaped groove 261 is inclined, one side is perpendicular to the horizontal plane, and the other side is inclined at an angle of 45 degrees.

[0034] A gas generating side plate one 23 and a gas generating side plate two 24 are arranged between the partition plate one 21 and the partition plate two 22, the moving contact 41 is located inside the W-shaped groove 261 and moves between the gas generating side plate one 23 and the gas generating side plate two 24, and a narrow slit channel is formed between the gas generating side plate one 23 and the gas generating side plate two 24 to push the air flow towards the arc extinguishing grid.

[0035] The gas-producing side plate 1 23 is attached to the side surface of the partition plate 1 21, and the gas-producing side plate 2 24 is attached to the side surface of the partition plate 2 22. An arc ignition grid 25 is fixedly installed at one end of the arc extinguishing chamber 2. An arc ignition angle 251 is fixedly provided on the arc ignition grid 25, and the arc ignition angle 251 is attached to the static contact 3. A permanent magnet 27 is fixedly installed on the gas-producing side plate 1 23, and the permanent magnet 27 is located between the gas-producing side plate 1 23 and the partition plate 1 21.

[0036] And a permanent magnet 27 is also installed between the gas-producing side plate 2 24 and the partition plate 2 22. The permanent magnet 27 is arranged at the middle to lower section starting from the arc starting point of the arc extinguishing chamber 2. When there is not enough air pressure in the switching unit at critical small current, the thrust provided by the permanent magnet 27 makes the arc enter the arc extinguishing chamber 2.

[0037] The permanent magnet 27 is located near the arc ignition grid 25 of the arc extinguishing chamber 2. An air duct 101 is provided at the end of the arc extinguishing chamber 2 far from the arc ignition grid 25. The air duct 101 is arranged in the housing 1, and a net plate 11 is fixedly installed in the air duct 101. The net plate 11 blocks the arc to achieve zero arc flash.

[0038] In this embodiment, the W-shaped grooves 261 on the adjacent arc extinguishing grids in the arc extinguishing chamber 2 are arranged staggeredly. A narrow gap is designed between the gas-producing partition plate and the moving contact 41. The arrangement position and magnetic direction of the permanent magnets are as Figure 8 、 Figure 9 shown. The arc extinguishing chamber 2 extinguishes the arc, has good arc extinguishing performance, can break critical small current, is not affected by the wiring direction, and has good breaking capacity.

[0039] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. An arc extinguishing chamber and its switching unit, characterized in that The switch unit includes a housing (1). A moving contact assembly (4) is rotatably arranged in the housing (1). A moving contact (41) is fixed on the moving contact assembly (4). Arc extinguishing chambers (2) are fixed on both sides of the moving contact assembly (4) in the housing (1). A static contact (3) is fixed at one end of the arc extinguishing chamber (2). The arc extinguishing chamber (2) includes a first partition plate (21) and a second partition plate (22). A first gas generating side plate (23) and a second gas generating side plate (24) are arranged between the first partition plate (21) and the second partition plate (22). An arc guiding grid (25) is fixed at one end of the arc extinguishing chamber (2). A permanent magnet (27) is fixed between the first gas generating side plate (23) and the first gas generating side plate (23). A permanent magnet (27) is also installed between the second gas generating side plate (24) and the second partition plate (22).

2. The arc extinguishing chamber and its switching unit according to claim 1, characterized in that, A plurality of arc extinguishing grid groups (26) are arranged between the first partition plate (21) and the second partition plate (22). A W-shaped groove (261) is arranged inside the arc extinguishing grid. The W-shaped grooves (261) on two adjacent arc extinguishing grids are arranged staggeredly.

3. The arc extinguishing chamber and its switching unit according to claim 1, characterized in that, A narrow slit channel is formed between the first gas generating side plate (23) and the second gas generating side plate (24).

4. The arc extinguishing chamber and its switch unit according to claim 1, characterized in that, The first gas generating side plate (23) is attached to the side surface of the first partition plate (21). The second gas generating side plate (24) is attached to the side surface of the second partition plate (22). An arc guiding angle (251) is fixed on the arc guiding grid (25). The arc guiding angle (251) is attached to the static contact (3).

5. The arc extinguishing chamber and its switching unit according to claim 4, characterized in that, The permanent magnet (27) is located near the arc guiding grid (25) in the arc extinguishing chamber (2).

6. The arc extinguishing chamber and its switching unit according to claim 4, characterized in that, An air duct (101) is arranged at the end of the arc extinguishing chamber (2) far from the arc guiding grid (25). The air duct (101) is arranged in the housing (1). A net plate (11) for blocking the arc is fixed in the air duct (101).

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