Arc extinguishing device with semi-enclosed chamber

Abstract

An arc extinguishing device with a semi-enclosed chamber comprises an arc extinguishing grid group (1), wherein the arc extinguishing grid group (1) is provided with a semi-enclosed insulating gas-producing hood (4) on one side where a moving contact (2) and a stationary contact (3) are coupled, wherein the outer side of the insulating gas-producing hood (4) is provided with a channel entrance (401) for the moving contact (2) and the stationary contact (3) to extend into, and the inner side is provided with a gas overflow port (402), wherein the opening sizes of the channel entrance (401) and the gas overflow port (402) are both contracted from the inside to the outside. The arc extinguishing device has a larger gas-producing material area, and the generated gas in the semi-enclosed chamber formed by the gas-producing material can maintain a high gas pressure in the chamber for a period of time, so that the gas in the channel can be continuously and rapidly discharged for a period of time, so as to maintain a high arc pressure, thereby achieving the purpose of rapid arc extinguishing.

Description

Technical Field

[0001] The invention belongs to the technical field of circuit breakers, and in particular relates to an arc extinguishing device with a semi-enclosed chamber. Background Art

[0002] Circuit breakers are an important part of power distribution equipment. They are mainly used in industrial low-voltage power systems to connect and disconnect currents in power grid circuits and protect lines and power equipment from overload, undervoltage, short circuit, single-phase grounding and other faults. The function of circuit breakers to disconnect overload or short-circuit currents is mainly completed by the arc extinguishing chamber installed in the circuit breaker. When a fault current appears in the circuit and the current value exceeds the set protection range of the circuit breaker, the tripping mechanism is activated to quickly disconnect the moving and static contacts of the circuit breaker. At this time, the voltage between the moving and static contacts causes the air medium to discharge and generate a high-temperature arc. The arc causes the air temperature in the arc extinguishing device to rise sharply during the burning process, thereby accelerating the ionization of the air. On the other hand, the arc is driven by the magnetic field and fluid effect in the arc extinguishing chamber, and is divided into multiple short arcs by multiple arc-isolating grids. The arc deionization effect is enhanced by the metal arc-isolating grids, and the arc becomes smaller and the voltage rises rapidly, causing the arc to extinguish.

[0003] With the development of new energy industries such as photovoltaics, the requirements for the rated working voltage of circuit breakers are getting higher and higher. The higher the arc voltage, the more beneficial it is for arc extinguishing. In the existing arc extinguishing process, a narrow channel is formed by gas-producing materials on both sides of the moving and static contacts. When the moving and static contacts are disconnected, the gas-producing materials cause the air pressure in the channel to increase under the action of the high temperature of the arc, thereby forming a gas blow, so that the arc moves quickly toward the arc extinguishing grid to achieve the purpose of arc extinguishing. However, in this traditional arc extinguishing process, the gas-producing materials form a channel open at both ends, and the gas in the channel will be discharged quickly, and the high air pressure cannot be maintained continuously, causing the arc voltage to drop quickly.

[0004] Chinese patent ZL201510770423.6 discloses a plastic case circuit breaker with a semi-enclosed arc extinguishing chamber. It is characterized by the use of semi-enclosed arc extinguishing chamber technology, that is, according to the appearance of the static contact component and the arc extinguishing grid and the positional relationship between the two during assembly, two arc extinguishing covers that are mirror-matched to each other are designed to fix the static contact component, the arc extinguishing grid and the DuPont paperboard inside the two arc extinguishing covers, and then integrate them into an integral module. The arc extinguishing device enhances the air tightness of the arc extinguishing chamber. However, there is no insulating gas-generating material between the contact and the grid, and the air blowing effect is poor. Summary of the invention

[0005] The purpose of the present invention is to provide an arc extinguishing device with a semi-closed chamber in order to address the technical defect of poor gas blowing effect of the above-mentioned existing arc extinguishing device with a semi-closed chamber. The gas producing material area is larger, and the gas generated in the semi-closed chamber formed by the gas producing material can maintain a high gas pressure in the chamber for a period of time, so that the gas in the channel can be continuously and quickly discharged for a period of time to maintain a high arc pressure, thereby achieving the purpose of rapid arc extinguishing.

[0006] Technical Solution

[0007] In order to achieve the above technical objectives, the present invention designs an arc extinguishing device with a semi-enclosed chamber, which includes an arc extinguishing grid group, and the arc extinguishing grid group is provided with a semi-enclosed insulating gas production hood on one side of the coupling of the moving contact and the static contact, the outer side surface of the insulating gas production hood is provided with a channel entrance for the moving contact and the static contact to extend into, and the inner side surface is provided with a gas overflow port, and it is characterized in that the opening sizes of the channel entrance and the gas overflow port both shrink from the inside to the outside.

[0008] Furthermore, the gas overflow port is larger than the channel inlet.

[0009] Furthermore, the insulating gas generating hood is made of gas generating material.

[0010] Beneficial Effects

[0011] The present invention provides an arc extinguishing device with a semi-enclosed chamber, in which the gas producing material area is larger. The generated gas is in the semi-enclosed chamber formed by the gas producing material, so that the high air pressure in the chamber can be maintained for a period of time, and the gas in the channel can be continuously and quickly discharged for a period of time to maintain a high arc pressure, thereby achieving the purpose of rapid arc extinguishing. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Attached Figure 1 It is a schematic diagram of the product structure of an embodiment of the present invention.

[0013] Attached Figure 2 It is a schematic diagram of an exploded view of an embodiment of the present invention.

[0014] Attached Figure 3 Schematic diagram of the structure of the inlet and gas overflow port of the insulating gas generating hood in the embodiment of the present invention. Figure 4 It is a schematic diagram of the structure of the insulating gas generating hood in an embodiment of the present invention. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0016] Example

[0017] As attached Figures 1 to 4As shown, an arc extinguishing device with a semi-enclosed chamber comprises an arc extinguishing grid group 1, wherein the arc extinguishing grid group 1 is provided with a semi-enclosed insulating gas-generating hood 4 on one side where the moving contact 2 and the stationary contact 3 are coupled, wherein the arc extinguishing grid group 1 comprises an arc extinguishing grid group abdomen and an arc extinguishing grid group leg, wherein the semi-enclosed insulating gas-generating hood 4 is located at the arc extinguishing grid group leg. The outer side surface of the insulating gas-generating hood 4 is provided with a channel entrance 401 for the moving contact 2 and the stationary contact 3 to extend into, and the inner side surface is provided with a gas overflow port 402, wherein the opening sizes of the channel entrance 401 and the gas overflow port 402 in the direction perpendicular to the movement of the moving contact 2 are both contracted from the inside to the outside, wherein the opening size of the gas overflow port 402 is gradually contracted from the inside to the outside.

[0018] The gas overflow port 402 is larger than the channel inlet 401 .

[0019] The insulating gas generating cover 4 is made of gas generating material.

[0020] The structure of this embodiment can make the internal pressure of the arc extinguishing chamber higher than the external pressure, and use the pressure difference to form a gas blowing effect to improve the breaking. Whether it is the contraction of the gas overflow port 402 or the contraction of the channel inlet 401, it can prevent the gas from leaving the chamber quickly, so as to achieve the effect of forming a pressure difference;

[0021] The present invention provides an arc extinguishing device with a semi-enclosed chamber, in which the gas producing material area is larger. The generated gas is in the semi-enclosed chamber formed by the gas producing material, so that the high air pressure in the chamber can be maintained for a period of time, and the gas in the channel can be continuously and quickly discharged for a period of time to maintain a high arc pressure, thereby achieving the purpose of rapid arc extinguishing.

[0022] The structures, proportions, sizes, quantities, etc. illustrated in the accompanying drawings of the embodiments of the present invention are only used to match the contents disclosed in the specification so as to be understood and read by those familiar with the technology, and are not used to limit the limiting conditions that the present invention can be implemented, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects that the present invention can produce and the purposes that can be achieved. At the same time, the terms such as "upper", "lower", "left", "right", "middle", "clockwise", "counterclockwise", etc. cited in this specification are only for the convenience of narration, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of the relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

Claims

1. An arc extinguishing device with a semi-enclosed chamber, comprising an arc extinguishing grid group (1), wherein the arc extinguishing grid group (1) is provided with a semi-enclosed insulating gas generating hood (4) on one side where a moving contact (2) and a stationary contact (3) are coupled, wherein the arc extinguishing grid group (1) comprises an arc extinguishing grid group belly and an arc extinguishing grid group leg, wherein the semi-enclosed insulating gas generating hood (4) is located at the arc extinguishing grid group leg, wherein the outer side surface of the insulating gas generating hood (4) is provided with a passage entrance (401) for the moving contact (2) and the stationary contact (3) to extend into, and the inner side surface is provided with a gas overflow port (402), wherein: The opening sizes of the channel inlet (401) and the gas overflow port (402) both shrink from the inside to the outside in a direction perpendicular to the movement direction of the moving contact (2), wherein the opening size of the gas overflow port (402) gradually shrinks from the inside to the outside.

2. An arc extinguishing device with a semi-enclosed chamber as claimed in claim 1, characterized in that: The gas overflow port (402) is larger than the channel inlet (401).

3. An arc extinguishing device with a semi-enclosed chamber as claimed in claim 1, characterized in that: The insulating gas generating hood (4) is made of a gas generating material.

Images