A high-break arc-extinguishing chamber

Abstract

A high breaking arc-extinguishing chamber comprises: symmetrically arranged partition plates; a plurality of arc-extinguishing fins; a gas generating cover; a gas outlet plate with a plurality of through holes; an upper arc striking plate with a plurality of through holes; and insulating fins with a plurality of through holes, the upper side of the insulating fins and the shell forming a longitudinal blowing gas storage space, and one side of the insulating fins being provided with a gas outlet communicating with the longitudinal blowing gas storage space, the gap between each arc-extinguishing fin and the through holes of the gas outlet plate forming a transverse blowing channel, and each arc-extinguishing fin and the through holes of the upper arc striking plate and the insulating fins forming a longitudinal blowing channel. When the pressure in the arc-extinguishing chamber increases, a part of the metal vapor is discharged into the longitudinal blowing gas storage space through the upper through holes and discharged from the gas outlet, thereby avoiding the accumulation and lingering of high-temperature metal vapor in the arc-extinguishing chamber, especially between the fins, and greatly reducing the possibility of arc reignition or short circuit caused by the conduction of metal vapor.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliances, specifically to a high breaking capacity arc-extinguishing chamber. Background Technology

[0002] During the breaking process, molded case circuit breakers generate electric arcs and metal vapors. The electric arc needs to be promptly introduced into the arc-extinguishing chamber to extinguish it, and the metal vapors need to be promptly discharged from the arc-extinguishing chamber cavity to prevent metal particles from depositing on the surface of the arc-extinguishing chamber and causing a short circuit in the arc-extinguishing chamber.

[0003] An arc-extinguishing chamber typically consists of symmetrically arranged partitions and an array of arc-extinguishing grids between the partitions. An insulating plate is usually located at the rear end of the arc-extinguishing chamber. The arc and metal vapor generated during the breaking of the molded case circuit breaker are discharged through the arc-extinguishing chamber and then through the insulating plate at the rear end. However, since the outlet of the circuit breaker is located on the insulating plate, which has several openings, and the metal vapor is discharged through these openings, the space between the insulating plate and the arc-extinguishing chamber is small. As a result, the metal vapor accumulates between the two, and a small portion of the vapor cannot be discharged. This causes the metal vapor to accumulate on the surface of the arc-extinguishing chamber, forming metal particles, which ultimately leads to a short circuit between the arc-extinguishing grids. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a high breaking capacity arc-extinguishing chamber.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A high-resolution arc-extinguishing chamber, comprising:

[0007] The partitions are symmetrically arranged, and an installation space is formed between them;

[0008] Several arc-extinguishing grid plates are stacked between two partitions;

[0009] A gas generating hood is provided at the front end of the arc-extinguishing grid plate;

[0010] The air outlet plate has several through holes and is located on the rear side of the arc-extinguishing grid plate;

[0011] An upper arc-drawing plate is provided at the upper end of the arc-extinguishing grid plate, and it has several through holes;

[0012] An insulating grid sheet is located on the upper side of the upper arc-leading plate and has several through holes.

[0013] A longitudinally blown gas storage space is formed between the upper side of the insulating grid sheet and the housing, and an air outlet communicating with the longitudinally blown gas storage space is provided on one side of the grid sheet.

[0014] The gaps between the various arc-extinguishing grids and the through holes in the exhaust plate form a cross-blowing channel.

[0015] Each arc-extinguishing grid plate, together with the through holes of the upper arc-leading plate and the insulating grid plate, forms a longitudinal blowing channel.

[0016] The number of through holes in the insulating grid is greater than the number of through holes in the upper arc-drawing plate.

[0017] The arc-extinguishing grid has an asymmetrical V-shaped arc-initiating opening, and the V-shaped arc-initiating openings of adjacent arc-extinguishing grids are staggered.

[0018] The through hole of the upper arc-starting plate is located on the rear side of the V-shaped arc-starting opening.

[0019] The bottom of the arc-extinguishing chamber is provided with a stationary contact, and the stationary contact is provided with a lower arc-drawing plate.

[0020] The lower arc-inducing plate is provided with an arc-inducing angle, and the arc-inducing angle is located below the lowermost arc-extinguishing grid plate.

[0021] The gas generating hood has several slots on the side near the partition, and the front end of each arc-extinguishing grid plate is inserted into the slot.

[0022] Insulating paper is provided on the rear side of the air outlet plate.

[0023] The beneficial effects of this utility model are as follows: by utilizing the longitudinal gas storage space and the longitudinal blowing channel, when the pressure in the arc-extinguishing chamber increases, a portion of the metal vapor is discharged into the longitudinal gas storage space through the upper through hole and discharged from the gas outlet, which avoids the accumulation and lingering of high-temperature metal vapor inside the arc-extinguishing chamber (especially between the grid plates), thereby greatly reducing the possibility of arc reignition or short circuit caused by the conductivity of metal vapor. Attached Figure Description

[0024] Figure 1 This is a cross-sectional schematic diagram of the present invention applied to a circuit breaker.

[0025] Figure 2 This is a schematic diagram of the structure of this utility model.

[0026] Figure 3 This is a cross-sectional schematic diagram of the present invention.

[0027] Figure 4 This is a schematic diagram of the arc-extinguishing grid of this utility model. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0030] like Figure 1 and Figure 2 As shown, a high breaking capacity arc-extinguishing chamber is mainly used in circuit breakers to cut the electric arc generated when the moving and stationary contacts open. It includes a partition plate 800, an arc-extinguishing grid plate 400, a gas generating hood 900, a gas outlet plate 600, an upper arc-leading plate 700, and an insulating grid plate 500.

[0031] The partitions 800 are arranged opposite each other, forming an installation space between them. The partitions are provided with several slots for connecting with the arc-extinguishing grid, the upper arc-leading plate and the insulating grid.

[0032] After the arc-extinguishing chamber is installed inside the housing, a longitudinal blowing gas storage space 210 is formed between the upper side of the insulating grid sheet 500 and the housing, and an air outlet 220 communicating with the longitudinal blowing gas storage space 210 is provided on one side of the space.

[0033] The gaps between each arc-extinguishing grid plate 400 and the through holes of the air outlet plate 600 form a cross-blowing channel.

[0034] Each arc-extinguishing grid plate 400, together with the through holes of the upper arc-leading plate 700 and the insulating grid plate 500, forms a longitudinal blowing channel, such as... Figure 3 As indicated by the middle arrow.

[0035] The horizontal blowing channel can be used to discharge the metal vapor in the arc extinguishing chamber from the outlet plate, and the vertical blowing channel can be used to discharge the metal vapor from the upper through hole into the vertical blowing gas storage space and then discharge it from the outlet.

[0036] The incandescent metal vapor and plasma generated by the electric arc are key factors in maintaining the arc's conductivity and preventing its extinction. The directional, high-speed airflow (vertically upward / backward) formed by the high-pressure gas can rapidly and forcibly blow these high-temperature conductive materials away from the arc region and the gaps between the arc-extinguishing grids, and discharge them outside the arc-extinguishing chamber.

[0037] While the high-speed airflow carries away heat, it also carries away a large number of charged particles (electrons and ions), which greatly promotes the recovery of the dielectric strength in the arc-extinguishing region (i.e., the deionization process), making it more difficult for the arc to reignite.

[0038] This avoids the accumulation and lingering of high-temperature metal vapor inside the arc-extinguishing chamber (especially between the grid plates), thus greatly reducing the possibility of arc reignition or short circuit caused by the conductivity of metal vapor.

[0039] A plurality of arc-extinguishing grid plates 400 are stacked between two partitions 800 and are distributed in an arc shape along the height direction of the partitions. Each arc-extinguishing grid plate 400 has an asymmetrical V-shaped arc-initiating opening 410, such as... Figure 4 As shown, the V-shaped arc initiation ports 410 of adjacent arc extinguishing grids are staggered. Through the staggered arrangement, the arc entering them is cut off more effectively, thus improving the arc extinguishing effect.

[0040] A gas generating hood 900 is located at the front end of the arc extinguishing grid plate 400. It is fixedly connected to the partition plate by screws. The two gas generating hoods are arranged opposite each other, and a narrow slit is formed between them for the moving contact to pass through. When an electric arc is generated, the gas generating hood is burned by the electric arc and releases gas, which increases the gas pressure inside the arc extinguishing chamber and pushes the electric arc forward.

[0041] The vent plate 600 has several through holes and is located behind the arc-extinguishing grid plate 400. The vent plate covers the entire rear of the arc-extinguishing chamber and has several through holes 10 on it.

[0042] An upper arc-drawing plate 700 is disposed on the upper end of the arc-extinguishing grid plate 400, and it is provided with several through holes 10.

[0043] An insulating grid sheet 500 is located on the upper side of the upper arc plate 700 and has several through holes 10.

[0044] The number of through holes 10 in the insulating grid 500 is greater than the number of through holes in the upper arc plate 700.

[0045] By utilizing the through holes in the upper arc plate and the insulating grid, a new exhaust path is established, which cleverly transforms the enormous energy generated by the electric arc itself into driving force, and enables it to exhaust vertically upwards. This allows for faster release of metal vapor in the arc-extinguishing chamber, preventing vapor accumulation and condensation on the arc-extinguishing grid, which could lead to a short circuit.

[0046] The through-hole of the upper arc-starting plate 700 is located on the rear side of the V-shaped arc-starting opening. This opening guides the arc deep into the arc-extinguishing grid while allowing gas to flow upwards. This elongates and segments the arc more fully, and allows metal vapor to escape upwards along the channel, preventing accumulation near the contacts. Top venting prevents metal from splashing back into the contact area, reducing the risk of secondary short circuits.

[0047] The bottom of the arc-extinguishing chamber is provided with a stationary contact 300, and a lower arc-inducing plate 310 is provided on the stationary contact. The lower arc-inducing plate 310 is provided with an arc-inducing angle, and the arc-inducing angle is located below the lowermost arc-extinguishing grid plate. Through the design of the arc-inducing angle, the electric arc is guided to the lowermost arc-extinguishing grid plate, and by utilizing the upward movement of high-temperature gas, a more effective directional airflow is formed to discharge the high-temperature material to the outside.

[0048] The gas generating hood 900 has several slots on the side near the partition, and the front end of each arc-extinguishing grid is inserted into the slot to fix the arc-extinguishing grid.

[0049] The exhaust plate 600 is provided with insulating paper 20 on the rear side to prevent dust. At the same time, the design of the insulating paper allows it to be pushed open by the internal airflow without affecting the exhaust effect of the exhaust plate.

[0050] The embodiments should not be regarded as limitations on the present invention, but any improvements made based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. A high-break arc-extinguishing chamber, characterized by: It includes: Symmetrically arranged partitions (800), with an installation space formed between them; Several arc-extinguishing grid plates (400) are stacked between two partitions (800); A gas generating hood (900) is provided at the front end of the arc extinguishing grid plate (400); The vent plate (600) has several through holes and is located on the rear side of the arc-extinguishing grid plate (400); An upper arc-drawing plate (700) is provided at the upper end of the arc-extinguishing grid plate (400), and it is provided with several through holes (10). An insulating grid sheet (500) is located on the upper side of the upper arc plate (700) and has several through holes (10). The upper side of the insulating grid sheet (500) forms a longitudinal blowing gas storage space (210) between itself and the housing, and an air outlet (220) communicating with the longitudinal blowing gas storage space (210) is provided on one side of it. The gaps between the various arc-extinguishing grid plates (400) and the through holes of the air outlet plate (600) form a cross-blowing channel. Each arc-extinguishing grid (400) forms a longitudinal blowing channel with the through holes of the upper arc-drawing plate (700) and the insulating grid (500).

2. A high-break arc-extinguishing chamber according to claim 1, characterized in that: The number of through holes (10) in the insulating grid (500) is greater than the number of through holes in the upper arc plate (700).

3. A high-break arc-extinguishing chamber according to claim 1, characterized in that: The arc-extinguishing grid plate (400) has an asymmetrical V-shaped arc-initiating opening (410), and the V-shaped arc-initiating openings (410) of adjacent arc-extinguishing grid plates are staggered.

4. A high-break arc-extinguishing chamber according to claim 3, characterized in that: The through hole of the upper arc-drawing plate (700) is located on the rear side of the V-shaped arc-drawing opening.

5. A high-break arc-extinguishing chamber according to claim 1, characterized in that: The bottom of the arc-extinguishing chamber is provided with a stationary contact (300), and the stationary contact is provided with a lower arc-drawing plate (310).

6. A high-break arc-extinguishing chamber according to claim 5, characterized in that: The lower arc-inducing plate (310) is provided with an arc-inducing angle, and the arc-inducing angle is located below the lowermost arc-extinguishing grid plate.

7. A high-break arc-extinguishing chamber according to claim 1, characterized in that: The gas generating hood (900) has several slots on the side near the partition, and the front end of each arc-extinguishing grid is inserted into the slot.

8. A high-breaking capacity arc-extinguishing chamber according to claim 1, characterized in that: The rear side of the vent plate (600) is provided with insulating paper (20).

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