灭弧室及断路器

Abstract

本实用新型提供了一种灭弧室及断路器，灭弧室包括壳体、导弧片、第一灭弧栅片组件和挡板，壳体的第一侧壁上设有第一进气通道，第一灭弧栅片组件包括与第一进气通道相对设置的第一灭弧栅片组、与第一侧壁的壳壁相对设置的第二灭弧栅片组，壳体内部靠近第二侧壁的一侧形成有导气通道，导弧片和第二灭弧栅片组之间形成有导弧通道，挡板设于第一灭弧栅片组的至少部分第一间隙内，挡板的至少部分位于导气通道内，挡板用于在灭弧栅片的壁厚方向上部分遮挡导气通道，以改变从第一进气通道直接流入第一间隙的气体流向，使气体裹挟电弧回流至导弧通道内，减少气体和电弧对第一灭弧栅片组的直接冲击，引导电弧被后端灭弧栅片切割，降低灭弧室前端烧损风险。

Claims

1. An arc-extinguishing chamber, comprising a housing, an arc-guiding plate, and a first arc-extinguishing grid assembly disposed inside the housing, the housing comprising a first sidewall and a second sidewall disposed opposite to each other, the first sidewall having a first air intake channel, the arc-guiding plate covering the inner wall surface of the first sidewall and detachably connected to the housing; the first arc-extinguishing grid assembly comprising a plurality of spaced-apart first arc-extinguishing grids, a first gap being formed between adjacent first arc-extinguishing grids, the plurality of first arc-extinguishing grids being divided into a first arc-extinguishing grid group disposed opposite to the first air intake channel and a second arc-extinguishing grid group disposed opposite to the housing wall; an air guide channel extending in a first direction is formed on the side of the housing near the second sidewall, and the second arc-extinguishing grid group and the arc-guiding plate forming an arc guide channel in a second direction; wherein, The first direction is the direction of the interval between the plurality of first arc-extinguishing grid plates, and the second direction is the wall thickness direction of the first sidewall; characterized in that the arc-extinguishing chamber further includes a baffle, the baffle is disposed in at least a portion of the first gap in the first arc-extinguishing grid plate group, at least a portion of the baffle is located in the air guiding channel, and the baffle is used to partially block the air guiding channel in the first direction.

2. The arc-extinguishing chamber as described in claim 1, characterized in that, The baffle is located on the side of the air guide channel facing the second sidewall.

3. The arc chute of claim 2, wherein, The distance between the end of the air guide channel facing the first air intake channel and the baffle in the second direction is one-third to one-half of the height of the air guide channel in the second direction.

4. The arc chute of claim 3, wherein, The end of the baffle away from the first air intake passage in the second direction abuts against the second side wall.

5. The arc chute of claim 1, wherein, The first arc-extinguishing grid plate is provided with an air guide hole, which is connected at both ends in the first direction, and the air guide hole and the first gap form the air guide channel.

6. The arc chute of claim 5, wherein, The arc-extinguishing chamber further includes a fixed base, which includes a plurality of fixed plates spaced apart along a first direction. A second gap is formed between two adjacent fixed plates. One end of the first arc-extinguishing grid plate facing the second side wall is accommodated in the second gap. The two end faces of the first arc-extinguishing grid plate in the first direction respectively abut against the fixed plates on the corresponding sides.

7. The arc chute of claim 6, wherein, The number of fixing seats is two, and the two fixing seats are spaced apart in the third direction. The two ends of the first arc extinguishing grid plate in the third direction are respectively connected to the fixing seats on the corresponding sides. The end face of the first arc-extinguishing grid plate facing the second sidewall and the two end faces of the first arc-extinguishing grid plate in the third direction are both in contact with the housing; The third direction is perpendicular to the plane formed by the first direction and the second direction.

8. The arc chute of claim 7, wherein, The fixed base also includes a raised part, which is located within the second gap and abuts against the second side wall; The first arc-extinguishing grid includes a main body and an extension. The end of the main body facing the second sidewall abuts against the raised portion. The extension is located at the end of the main body facing the second sidewall and between two adjacent raised portions in the third direction. The two end faces of the extension in the third direction abut against the raised portions, and the end face of the extension facing the second sidewall abuts against the second sidewall.

9. The arc chute according to any one of claims 1 to 8, wherein The baffle is provided in the first gap of the second arc-extinguishing grid plate group at least in the portion close to the first arc-extinguishing grid plate group.

10. The arc chute of claim 9, wherein, The baffle is provided in at most three of the first gaps adjacent to the first arc-extinguishing grid group in the second arc-extinguishing grid group.

11. A circuit breaker characterized by, The circuit breaker includes an arc-extinguishing chamber as described in any one of claims 1-10.

12. The circuit breaker of claim 11, wherein, The circuit breaker includes a first arc-extinguishing chamber and a second arc-extinguishing chamber, the first arc-extinguishing chamber and the second arc-extinguishing chamber are connected, the orientation of the first air intake channel of the first arc-extinguishing chamber forms an angle with the orientation of the second air intake channel of the second arc-extinguishing chamber, the first arc-extinguishing chamber is the arc-extinguishing chamber as described in any one of claims 1-10, and the stationary contact of the circuit breaker is disposed on the first arc-extinguishing chamber.

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