CN-122000254-A - Explosion chamber dissociation structure that disappears

CN122000254ACN 122000254 ACN122000254 ACN 122000254ACN-122000254-A

Abstract

An arc-extinguishing chamber dissociation structure, the gas vent department of explosion chamber is provided with the gaseous speed reduction passageway. The heat flow from the arc extinguishing chamber is split by the splitter plate, so that the defects that the fluid only flows out of the top cover, the local flow velocity is larger and the flashover distance is long are avoided, and the cooling effect is further improved.

Inventors

YANG HOUWEN
JIANG GUPING
PENG QIONG
GONG ZUOYONG
QUAN JIAQING

Assignees

上海良信电器股份有限公司
良信电器(海盐)有限公司

Dates

Publication Date: 20260508
Application Date: 20241106

Claims (10)

1. An arc extinguishing chamber dissociation structure is characterized in that a gas deceleration channel is arranged at an exhaust port (101) of an arc extinguishing chamber (1); The gas deceleration channel is at least one hole (501) on at least one hole plate (5), the at least one hole (501) penetrates through the at least one hole plate (5), the at least one hole plate (5) is overlapped side by side and is positioned on the outer side of an exhaust port (101) of the arc extinguishing chamber (1), and the aperture of one side, close to the exhaust port (101) of the arc extinguishing chamber (1), of the at least one hole (501) on the at least one hole plate (5) is smaller than the aperture of one side, far away from the exhaust port (101) of the arc extinguishing chamber (1).
2. The arc extinguishing chamber dissociation structure according to claim 1, wherein the gas outlet of the gas deceleration channel is connected with a first heat exchange wire mesh (2), and the protective cover (3) is arranged outside the first heat exchange wire mesh (2).
3. The arc extinguishing chamber dissociation structure according to claim 2, wherein a separation plate (4) is arranged in the protective cover (3), and the separation plate (4) separates the inner cavity of the protective cover (3) into at least two gas channels, so that the gas subjected to heat exchange through the first heat exchange wire mesh (2) can be discharged from the exhaust port of the protective cover (3).
4. The arc extinguishing chamber dissociation structure according to claim 1, wherein the at least one hole (501) is a diverging hole.
5. The arc extinguishing chamber dissociation structure of claim 4, wherein the cross section of the gradually enlarging hole is trapezoid.
6. The arc extinguishing chamber dissociation structure of claim 1, wherein the side of the orifice plate (5) near the exhaust port (101) is provided with at least one gas collecting hole (502) corresponding to the at least one hole (501).
7. The arc extinguishing chamber dissociation structure of claim 6, wherein the at least one gas collecting hole (502) is a tapered hole.
8. An arc extinguishing chamber dissociation structure as claimed in claim 3, characterized in that the exhaust port inside the protective cover (3) is further provided with a second heat exchange wire mesh (6) for further cooling the gas exhausted from the protective cover (3).
9. An arc extinguishing chamber dissociation structure as claimed in claim 3, wherein the number of the partition plates (4) is 2, the inner cavity of the protective cover (3) is divided into vertical gas channels which are arranged in a horizontal direction and are shaped like a Chinese character 'Chuan', and the partition plates (4) divide the protective cover (3) into an intermediate gas channel (3 a) for discharging gas from the top surface and/or the rear end surface, a left gas channel (3 b) for discharging gas from the top surface and/or the left side surface and/or the rear end surface, and a right gas channel (3 c) for discharging gas from the top surface and/or the right side surface and/or the rear end surface.
10. An arc extinguishing chamber dissociation structure as claimed in claim 3, wherein the number of the partition plates (4) is 2, the partition plates (4) are arc-shaped, the partition plates (4) divide the protective cover (3) into an intermediate gas passage (3 a) through which gas is discharged from the top surface and/or the rear end surface, a left gas passage (3 b) through which gas is discharged from the left side surface and/or the rear end surface, and a right gas passage (3 c) through which gas is discharged from the right side surface and/or the rear end surface, and the intermediate gas passage (1 a) is in a shape of being wide at the top and narrow at the bottom.

Description

Explosion chamber dissociation structure that disappears Technical Field The invention belongs to the technical field of circuit breakers, and particularly relates to an arc extinguishing chamber dissociation structure. Background In an industrial low-voltage power system, a circuit breaker is used as an important component in a power distribution network for distributing electric energy, switching on and off current in a power grid circuit, protecting circuits and power supply equipment from damage caused by faults such as overload, undervoltage, short circuit, single-phase grounding and the like, and is an important component of a power supply system. When the circuit breaks down, the breaker monitors that the current value exceeds the preset protection current value, the operation mechanism is triggered to act, so that the movable contact and the fixed contact are rapidly broken, and the circuit is disconnected. However, in the breaking process, the electric current value is too large, so that the movable contact and the static contact generate electric arcs in the breaking process, and the electric field is too strong, so that the gas in the circuit breaker is highly ionized, a large amount of free metal ions are generated, and if the free metal particles fly out of the circuit breaker, short circuits and burnout of peripheral circuits can be caused, thereby causing disasters. In the prior art, the dissociation structure is directly overlapped and combined by using a pore plate and a silk screen, but the traditional structure has low heat exchange efficiency and serious flashover. The contact area between the high-speed hot fluid and the silk screen is limited after the high-speed hot fluid passes through the pore plate, the effective heat exchange area is reduced, and the cooling effect is deteriorated. In order to ensure zero flashover, a plurality of layers of pore plates and silk screens are often arranged, but the arrangement of the excessive pore plates and silk screens can cause the overhigh air pressure of an arc extinguishing chamber, so that the breaking performance of a circuit breaker product is affected. In addition, the cavity fluid of the protective cover mainly flows out from two sides of the top cover, and the hot fluid cannot be sufficiently cooled, so that the zero flashover effect is reduced. Disclosure of Invention The invention aims to overcome the defects of the existing arc-extinguishing chamber dissociation structure, and provides the arc-extinguishing chamber dissociation structure, wherein a divergent orifice plate is arranged at one side of an exhaust port of the arc-extinguishing chamber to increase the effective heat exchange area of heating fluid and a silk screen, and meanwhile, a separation plate and the silk screen are arranged in a protective cover, so that the hot fluid flowing out of the arc-extinguishing chamber is shunted through the separation plate, the defects that the fluid only flows out of a top cover, the local flow velocity is larger and the flashover distance is long are overcome, and the cooling effect is further improved. Technical proposal In order to achieve the technical aim, the invention provides an arc-extinguishing chamber dissociation structure, which is characterized in that a gas deceleration channel is arranged at an exhaust port of the arc-extinguishing chamber; The gas speed reducing channel is at least one hole on at least one hole plate, the at least one hole penetrates through the at least one hole plate, the at least one hole plate is overlapped and located outside the exhaust port of the arc extinguishing chamber side by side, and the aperture of the at least one hole on the at least one hole plate, which is close to one side of the exhaust port of the arc extinguishing chamber, is smaller than the aperture of the hole on one side, which is far away from the exhaust port of the arc extinguishing chamber 1. In one embodiment, a first heat exchange wire mesh is connected to the gas outlet of the gas deceleration channel, and a protective cover is arranged outside the first heat exchange wire mesh. In one embodiment, a partition plate is arranged in the protective cover, and the partition plate divides the inner cavity of the protective cover into at least two gas channels, so that gas subjected to heat exchange through the first heat exchange wire mesh can be discharged from the exhaust port of the protective cover. In one embodiment, the at least one hole is a tapered hole. In one embodiment, the tapered bore is trapezoidal in cross-section. In one embodiment, at least one gas collecting hole is arranged on one side of the pore plate, which is close to the gas outlet, and corresponds to the at least one hole. In one embodiment, the at least one gas collection hole is a tapered hole. In one embodiment, a second heat exchange wire mesh is further arranged at the exhaust port on the inner side of the protective cover, so that the gas exhaus