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Air-blowing arcing shield

An arc extinguishing hood and air blowing type technology, applied in the field of arc extinguishing device and air blowing arc extinguishing hood, can solve the problem that the closing speed and closing pressure cannot be effectively reduced or increased.

Active Publication Date: 2014-09-10
ZHEJIANG TENGEN ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is that the air-blown arc extinguishing mechanism in the prior art can not effectively reduce the arc entering the operating mechanism, but the closing speed and closing pressure of the moving contact are affected by the addition of components, thereby providing a Air-blown arc extinguishing hood that can effectively reduce the amount of arc entering the operating mechanism

Method used

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  • Air-blowing arcing shield
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment provides an air-blown arc extinguishing hood, comprising: an arc extinguishing housing 3 with a number of arc extinguishing grids 31 inside; a static contact 4 arranged at the bottom of the arc extinguishing housing 3 for operation The moving contact 1 of the mechanism cooperates with it to realize closing and opening operations; it also includes a blower cover 2 , which is arranged inside the arc extinguishing housing 3 .

[0032] Such as figure 2 with image 3As shown, the air blowing cover 2 includes a high-pressure zone cover plate 21 and a diversion zone cover plate 22; and the bottom ends of the high-pressure zone cover plate 21 and the diversion zone cover plate 22 are fixedly connected together by a connecting plate 23 The inner wall of the cover plate 21 in the high-voltage area can generate gas under the action of arc combustion to form a high-pressure area. In the prior art, there are many materials that can generate gas under the action of ...

Embodiment 2

[0036] In this embodiment, on the basis of Embodiment 1, the following improvements are made. The width of the exhaust port 211 is greater than the width of the communication channel 210 between the high-pressure area cover plate 21 and the diversion area cover plate 22. The channel 210 has the same width as the rear opening 220 .

[0037] In actual operation, as long as the width of the exhaust port is greater than the width of the communication channel 210, it is not necessary to limit the shapes of the high-pressure zone cover plate 21 and the diversion zone cover plate 22, as Figure 4 with Figure 5 Two schematic diagrams of the shape of the high-pressure zone cover plate 21 and the split flow zone cover plate 22 are given, but those skilled in the art can derive other shapes of the high-pressure zone cover plate 21 and The structure of the cover plate 22 in the diversion area is within the protection scope of the present application.

Embodiment 3

[0039] to combine figure 1 with Figure 7 , it can be concluded that the present application can be improved as follows on the basis of Embodiment 1 or Embodiment 2, and also includes a static cover 5, which is coated on the silver point 41 on the upper surface of the static contact 4 through the wrapping groove 52 , is in contact with the lower part of the cover plate 21 in the high-voltage area, and the upper surface of the static cover 5 generates gas under the action of arc combustion. The material of the upper surface of the static cover 5 is PA66 (polyamide 66 or nylon 66), or PBT (polybutylene terephthalate, English name polybutylene terephthalate), PA6 (polyamide 6 or nylon 6) or ABS (acrylonitrile-butadiene-styrene plastic), POM (Polyoxymethylene polyoxymethylene) or BMC (Bulk molding compounds, bulk molding compound), DMC (methacryloyloxyethyltrimethylammonium chloride). Therefore, the gas-producing surface 51 of the static cover 5 in this embodiment, that is, the ...

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PUM

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Abstract

The invention relates to an air-blown arc extinguishing hood, comprising: an arc extinguishing housing, inside which are arranged several arc extinguishing grids; a static contact, which is arranged at the bottom of the arc extinguishing housing, and a moving contact It cooperates with it to realize closing and opening operations; it also includes an air-blown cover, which includes a high-voltage zone cover plate and a shunt zone cover plate; the inner wall of the high-voltage zone cover plate can generate gas under the action of arc combustion to form a high-voltage zone, and the The gas generates airflow under the action of the pressure difference between the inside and outside of the cover plate in the high-pressure area, and the airflow is blown into the arc-extinguishing grid through the exhaust port opposite to the arc-extinguishing grid; A rear opening consistent with the width of the moving contact is provided, a diversion area is formed in the cover plate of the diversion area, and the diversion area directly communicates with the outer space through an airflow channel; after the airflow enters the diversion area Enter the outer space through the airflow channel, and then blow into the arc extinguishing grid.

Description

technical field [0001] The invention relates to an arc extinguishing device in a molded case circuit breaker, in particular to an air blowing arc extinguishing cover which can reduce the amount of arc blown into the operating mechanism by changing the direction of the blowing air flow, and belongs to low-voltage electrical applications technology field. Background technique [0002] The arc extinguishing chambers of the existing molded case circuit breakers are generally composed of arc extinguishing grids and gas-generating materials. When the circuit breaker is opened, when the moving and static contacts are separated, an arc is generated. Since the contact movement route of the moving contact is in the cavity of the arc extinguishing grid of the arc extinguishing device, the arc enters the arc extinguishing grid under the action of electromotive force, and cuts the arc into a series of short arcs in series, making the arc thinner And quickly increase the arc voltage, so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H9/34H01H73/18
Inventor 袁夫生袁高普王兴利包晓忠葛世伟
Owner ZHEJIANG TENGEN ELECTRIC