A gas production sheet, an arc extinguishing device and a circuit breaker having the same

Abstract

The application provides a gas production sheet, an arc extinguishing device and a circuit breaker with the same, and belongs to the technical field of low-voltage electrical apparatuses. The gas production sheet comprises, in sequence, a mounting portion, a connecting portion and an arc-shaped portion. The mounting portion has a fitting surface. The arc-shaped portion comprises a plurality of arc-shaped claws. The fitting surface of the mounting portion of the gas production sheet is matched with a mounting surface of the arc extinguishing device, so that the gas production sheet is mounted on the arc extinguishing device. The arc-shaped portion comprises the arc-shaped claws. The interval distance between two adjacent arc-shaped claws is suitable for accommodating an arc extinguishing grid sheet in the arc extinguishing device. The arc-shaped claws are inserted into the gap between the arc extinguishing grid sheets. The arc-shaped claws block one end of the arc extinguishing grid sheet, so that the electric arc can only move in the direction of the arc extinguishing cover. Meanwhile, the connecting portions of two gas production sheets oppositely form a gradually converging electric arc channel, so as to accelerate the movement of the airflow. The arc-shaped claws can prevent the high-pressure gas backflow from impacting the gas production sheet, so as to cause damage or falling of the gas production sheet.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of low-voltage electrical apparatus, in particular to a gas production sheet, an arc extinguishing device and a circuit breaker with the same. BACKGROUND

[0002] The circuit breaker is installed on the main circuit to cut off the main circuit when overloading or short circuit occurs in the main circuit. When the circuit breaker cuts off the main circuit, the internal moving contact and the static contact of the circuit breaker are rapidly disconnected, at this time, the voltage between the moving contact and the static contact causes air medium discharge to generate high-temperature arc, and the arc causes the temperature of the air in the arc extinguishing device to rise sharply during the combustion process to accelerate the ionization of the air. On the other hand, the arc is separated into multiple short arcs by multiple arc separation grids under the push of the magnetic field and fluid effect in the arc chamber, and the deionization effect of the arc is strengthened by the metal arc separation grids, so that the arc becomes smaller and the voltage rises rapidly, and the arc is extinguished. In order to improve the arc extinguishing performance of the arc chamber, the arc is generally required to quickly enter the arc extinguishing grids of the arc chamber, so that the grids effectively cut the arc to achieve the effect of quickly extinguishing the arc.

[0003] In order to make the arc quickly enter the arc chamber, air blowing or magnetic blowing technology is usually used, and for the air blowing technology, gas production materials are often used in combination with gradually shrinking arc channels (called Laval nozzles) to achieve this. The principle of this scheme is to make the gas pressure at the front end of the arc chamber higher than the gas pressure at the back of the arc chamber through the gradually shrinking arc channel, so as to form gas flow to blow the arc to move to the arc chamber.

[0004] For example, Chinese patent document (CN204720403U) discloses an arc chamber, which includes grids and insulating sheets, the grids are arranged in the arc chamber, the grid includes a base, two foot portions are below the base, a recess is formed between the two foot portions, and the insulating sheets cover the foot portions from the ends of the two foot portions away from the base and along the two opposite inner sides of the foot portions. When the arc is generated, the insulating sheets generate high gas pressure, and the high gas pressure drives the arc to quickly enter the arc chamber. In the above scheme, the insulating sheets can generate high gas pressure under the influence of the arc, although the speed of the arc entering the arc chamber can be accelerated, but when the arc enters the arc chamber through the insulating sheets, the arc will move to both sides of the arc chamber, and vortex gas flow may be formed on both sides of the arc chamber to impact the back of the insulating sheets on both sides, so that the insulating sheets fall off. SUMMARY

[0005] Therefore, the technical problem to be solved by the present application is to overcome the defect that the arc forms vortex gas flow to impact the insulating sheets on both sides after entering the arc extinguishing device and may cause the insulating sheets to fall off in the prior art, so as to provide a gas production structure and an arc extinguishing device with the same.

[0006] The present application also provides a circuit breaker with the above-mentioned arc extinguishing device.

[0007] To solve the above technical problems, the application provides a gas production sheet, which comprises a mounting part, a connecting part and an arc-shaped part connected in sequence, the mounting part is provided with a fitting surface for matching with a mounting surface of an arc extinguishing device, the connecting part is a slope plate or an arc-shaped plate extending in a direction opposite to the direction of the fitting surface, and the arc-shaped part comprises a plurality of arc-shaped claws distributed at intervals.

[0008] The thickness of the arc-shaped claw is suitable for being inserted between arc extinguishing grid sheets in two adjacent arc extinguishing devices, and the interval distance between the two adjacent arc-shaped claws is suitable for accommodating the arc extinguishing grid sheet in the arc extinguishing device.

[0009] As a preferred technical solution, the fitting surface is a plane suitable for fitting with the mounting surface of the arc extinguishing device.

[0010] As a preferred technical solution, a plurality of elastic insertion buckles are arranged at intervals on the mounting part.

[0011] As a preferred technical solution, an end of the mounting part away from the connecting part is provided with a bending section, and the bending direction of the bending section is the same as the direction of the fitting surface.

[0012] As a preferred technical solution, one side of the bending section connected with the fitting surface is arranged to be inclined relative to the fitting surface.

[0013] As a preferred technical solution, the end of the bending section is a plane suitable for fitting with the mounting surface of the arc extinguishing device.

[0014] The application further provides an arc extinguishing device comprising the gas production sheet, and further comprising an arc extinguishing cover, wherein the arc extinguishing cover is provided with an arc extinguishing chamber, and a plurality of arc extinguishing grid sheets are arranged in the arc extinguishing chamber, and the arc extinguishing grid sheets are provided with gaps.

[0015] The gas production sheet has at least two opposite gas production sheets, and the two gas production sheets cover the arc extinguishing grid sheet pins on the two sides of the arc extinguishing cover respectively, and the arc-shaped claws of the two gas production sheets are respectively inserted into the gaps of the arc extinguishing grid sheets.

[0016] As a preferred technical solution, the extending end of the arc-shaped claw of the gas production sheet abuts against the inner wall of the arc extinguishing cover.

[0017] As a preferred technical solution, a plurality of elastic insertion buckles are arranged at intervals on the mounting part of the gas production sheet, and a plurality of insertion holes matched with the elastic insertion buckles are arranged on the inner wall of the arc extinguishing cover for connecting the mounting part.

[0018] The application further provides a circuit breaker comprising the arc extinguishing device.

[0019] The technical scheme of the present application has the following advantages:

[0020] 1. The gas production sheet provided by the present application, the fitting surface of the mounting portion of the gas production sheet cooperates with the mounting surface of the arc extinguishing device, so that the gas production sheet is mounted on the arc extinguishing device; the connecting portion is an outwardly extending inclined plate or an arc-shaped plate, which can enable the high-pressure gas to drive the electric arc along the surface of the inclined plate or the arc-shaped plate into the arc extinguishing device; the arc-shaped portion includes spaced apart arc-shaped claws, the spacing distance between two adjacent arc-shaped claws is suitable for accommodating an arc-extinguishing grid sheet in the arc extinguishing device, the gap between two arc-extinguishing grid sheets is suitable for accommodating an arc-shaped claw, the arc-shaped claw is inserted into the gap between the arc-extinguishing grid sheets, and the arc-shaped claw blocks one end of the arc-extinguishing grid sheet, so that the electric arc can only contact the surface of one side of the gas production sheet; after the gas production sheet contacts the electric arc, a large amount of gas is generated, high pressure is formed at the entrance of the arc extinguishing device, the high-pressure gas is further accelerated through the converging arc passage, and drives the electric arc to quickly enter the arc extinguishing device; after the high-pressure gas enters the arc extinguishing device, it diffuses along the surface of the arc-shaped claw to both sides of the arc extinguishing device, so that the high-pressure gas moves along the extension direction of the arc-shaped claw; at the same time, the arc-shaped claw blocks one end of the arc-extinguishing grid sheet, which can prevent the high-pressure gas from flowing back into the back of the gas production sheet and impacting the gas production sheet.

[0021] 2. The gas production sheet provided by the present application, the fitting surface is a plane, which is convenient to operate during installation and is relatively simple to produce.

[0022] 3. The gas production sheet provided by the present application, the mounting portion is provided with elastic insertion buckles at intervals, which can be inserted on the arc extinguishing device, so that the gas production sheet is mounted on the arc extinguishing device.

[0023] 4. The gas production sheet provided by the present application, the mounting portion has a bending section, which is clamped with the mounting surface of the arc extinguishing device, so as to further ensure the stability of the gas production sheet connected to the arc extinguishing device; the end of the bending section is a plane, which is convenient to match with the mounting surface of the arc extinguishing device.

[0024] 5. The arc extinguishing device provided by the present application, the gas production sheet covers the arc-extinguishing grid sheet pins on both sides of the arc-extinguishing cover, the arc-shaped claws of the gas production sheet are inserted into the gaps of the arc-extinguishing grid sheets, and the connecting portions of the gas production sheets on both sides form gradually converging arc entrances; the generated electric arc is accelerated to pass through the connecting portions of the gas production sheets and quickly diffuses along the surfaces of the arc-shaped claws of the gas production sheets to both sides of the arc extinguishing device.

[0025] 6. The arc extinguishing device provided by the present application, the extension end of the arc-shaped claw of the gas production sheet abuts against the inner wall of the arc-extinguishing cover, so as to avoid the backflow of the electric arc through the gap between the arc-shaped claw and the inner wall of the arc-extinguishing cover.

[0026] 7. The arc extinguishing device provided by the present application, a plurality of insertion holes are arranged on the inner wall of the arc-extinguishing cover, and the elastic insertion buckles on the mounting portion of the gas production sheet are inserted into the holes, so that the gas production sheet is mounted on the arc-extinguishing cover. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application or the prior art, the accompanying drawings needed to be used in the specific embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0028] Figure 1 The structural schematic diagram of the gas production sheet provided by the present application is shown in the figure.

[0029] Figure 2 The left view of the gas production sheet provided by the present application is shown in the figure.

[0030] Figure 3 The structural schematic diagram of the arc extinguishing device provided by the present application is shown in the figure.

[0031] Figure 4 The exploded view of the arc extinguishing device is shown in the figure. Figure 3

[0032] Explanation of reference signs:

[0033] 1, gas production sheet; 11, mounting part; 12, connecting part; 13, arc-shaped part; 131, arc-shaped claw; 14, bending section; 15, elastic insertion buckle; 2, arc extinguishing grid sheet; 21, pin; 3, arc extinguishing cover; 31, insertion hole; 4, cover plate; 41, gas outlet; 5, arc leading plate; 6, gas blocking plate; 7, arc separating plate. Specific embodiments

[0034] The technical solutions of the present application will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort belong to the scope of protection of the present application.

[0035] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the present application.

[0036] ​In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] Example 1

[0039] This embodiment provides a specific implementation of the gas-generating plate 1, such as... Figure 1 As shown, the gas generating plate 1 has a mounting portion 11, a connecting portion 12, and an arc-shaped portion 13. The mounting portion 11 of the gas generating plate 1 has a mating surface that mates with the mounting surface of the arc extinguishing device, allowing the gas generating plate 1 to be mounted on the arc extinguishing device. The connecting portion 12 is an outwardly extending inclined plate that allows the generated arc to quickly enter the arc extinguishing device along the surface of the inclined plate. After the gas generating plate 1 comes into contact with the arc, it generates a large amount of gas to form a high-pressure zone. The high-pressure gas carries the arc into the arc extinguishing device. The arc-shaped portion 13 includes spaced arc-shaped claws 131. The thickness of the arc-shaped claws 131 is the same as the gap between the arc extinguishing grid plates 2, and the spacing between two adjacent arc-shaped claws 131 is the same as the thickness of the arc extinguishing grid plates 2. The arc-shaped claws 131 are inserted one by one into the gap between the arc-extinguishing grid plates 2, blocking the end of the arc-extinguishing grid plate 2 near the arc inlet, so that the arc only contacts the surface of one side of the gas generating plate 1, preventing high-pressure gas from entering between the gas generating plate 1 and the side wall of the arc-extinguishing device. After a portion of the high-pressure gas enters the arc-extinguishing device, it diffuses along the surface of the arc-shaped claws 131 to both sides of the arc-extinguishing device, so that the high-pressure gas moves along the extension direction of the arc-shaped claws 131. At the same time, the arc-shaped claws 131 have blocked the end of the arc-extinguishing grid plate 2 near the arc inlet, so that the high-pressure gas can only move along the surface of the arc-shaped claws 131 towards the outlet, which can prevent the high-pressure gas from flowing back into the back of the gas generating plate 1 and impacting the gas generating plate 1.

[0040] As an alternative implementation, the connecting portion 12 of the gas generating plate 1 can also be configured as an outwardly extending arc-shaped plate.

[0041] The distance between two adjacent arc-shaped claws 131 in the gas generating plate 1 is suitable for accommodating the arc-extinguishing grid plate 2, so that the arc-shaped claws 131 of the gas generating plate 1 can be installed into the arc-extinguishing device so that the gas generating plate 1 can cooperate with the arc-extinguishing device.

[0042] like Figure 2As shown, the abutting surface is a plane, which is convenient for operation during installation and simple for production.

[0043] The elastic insertion buckle 15 is arranged on the mounting portion 11 in intervals and can be inserted on the arc extinguishing device, so that the gas production sheet 1 can be mounted on the arc extinguishing device.

[0044] The bending section 14 is clamped with the mounting surface of the arc extinguishing device, further ensuring the stability of the connection of the gas production sheet 1 on the arc extinguishing device; the end of the bending section 14 is a plane, which is convenient for abutting with the mounting surface of the arc extinguishing device.

[0045] Working principle:

[0046] The gas production sheet 1 has a mounting portion 11, a connecting portion 12 and an arc-shaped portion 13. The elastic insertion buckle 15 is arranged on the mounting portion 11, so that the gas production sheet 1 can be mounted together with the arc extinguishing device. The connecting portion 12 is a slope plate or an arc-shaped plate. Two opposite slope plates or arc-shaped plates can form a gradually converging arc entrance. The arc is accelerated through the arc entrance under the driving of high-pressure gas. The arc-shaped portion 13 has spaced arc-shaped claws 131 extending therefrom. The gap between the arc-shaped claws 131 is suitable for accommodating the arc extinguishing grid sheet 2. After the arc is accelerated through the gradually converging arc entrance under the driving of high-pressure gas, part of the high-pressure gas rapidly spreads to both sides of the arc extinguishing device along the surface of the arc-shaped claw 131, accelerating the arc extinguishing speed. At the same time, the arc-shaped claw 131 is inserted into the gap between the arc extinguishing grid sheet 2 one by one, blocking the end of the arc extinguishing grid sheet 2 close to the arc entrance, so that the high-pressure gas can only contact the surface of one side of the gas production sheet 1, and the high-pressure gas can only move along the surface of the arc-shaped claw 131 to the gas outlet end of the arc extinguishing device, avoiding the formation of vortex flow when the high-speed moving high-pressure gas spreads to both sides of the arc extinguishing device, which enters the other side of the gas production sheet 1 and impacts the surface of the other side of the gas production sheet 1.

[0047] Example 2

[0048] This embodiment provides a specific implementation of the arc extinguishing device, as shown in the accompanying drawings. Figure 3 As shown, the gas production sheet 1 covers the pins 21 of the arc extinguishing grid sheet 2 on both sides of the arc extinguishing cover 3. The arc-shaped claw 131 of the gas production sheet 1 is inserted into the gap of the arc extinguishing grid sheet 2. The connecting portion 12 of the gas production sheet 1 on both sides forms a gradually converging arc entrance. The gas production sheet 1 generates a large amount of gas under the action of the arc to form a high-pressure area. The generated arc is accelerated through the connecting portion 12 of the gas production sheet 1 under the driving of high-pressure gas. Part of the high-pressure gas will rapidly spread to both sides of the arc extinguishing device along the surface of the arc-shaped claw 131 of the gas production sheet 1.

[0049] The extension end of the arc-shaped claw 131 of the gas production sheet 1 abuts against the inner wall of the arc extinguishing cover 3, avoiding the backflow of the high-pressure gas spreading to both sides of the arc extinguishing chamber through the gap between the arc-shaped claw 131 and the inner wall of the arc extinguishing cover 3.

[0050] A plurality of insertion holes 31 are arranged on the inner wall of the arc extinguishing cover 3, and the elastic insertion buckles 15 on the gas production sheet 1 mounting portion 11 are inserted into the holes, so that the gas production sheet 1 is mounted on the arc extinguishing cover 3.

[0051] As shown in Figure 4 , the arc extinguishing device further comprises an arc striking plate 5, which facilitates the generated arc to quickly enter the inlet of the arc extinguishing device.

[0052] The arc extinguishing device is further provided with an arc separation plate 7, a gas blocking plate 6 is arranged on the arc separation plate 7, a cover plate 4 is arranged on the gas blocking plate 6, and a gas outlet 41 is arranged on the cover plate 4. The gas blocking plate 6 is arranged obliquely, and the arc separation plate 7 has an arc-shaped structure, which can prevent the unextinguished arc from running out of the arc extinguishing chamber. After the arc is extinguished, the high-temperature gas moves to the gas outlet 41 and directly contacts the gas blocking plate 6 when passing through the gas blocking plate 6, thereby preliminarily cooling the high-temperature gas and then discharging the arc extinguishing device.

[0053] Working principle:

[0054] The arc extinguishing device is provided with two opposite gas production sheets 1, which cover the pins 21 of the arc extinguishing grid sheets 2 on both sides of the arc extinguishing cover 3. The arc-shaped claws 131 of the gas production sheets 1 are inserted into the gaps between the arc extinguishing grid sheets 2. An arc striking plate 5 is arranged on one side of the gas production sheet 1, an arc separation plate 7 is arranged above the arc extinguishing grid sheet 2, a gas blocking plate 6 is arranged above the arc separation plate 7, and a cover plate 4 is arranged above the gas blocking plate 6. A gas outlet 41 is arranged on the cover plate 4. The connecting portions 12 of the two gas production sheets 1 form a gradually converging arc inlet. The arc enters the arc inlet under the action of the arc striking plate 5. The gas production sheet 1 generates a large amount of gas under the action of the arc, forming a high gas pressure. When the high-pressure gas drives the arc to pass through the gradually converging arc inlet, it will accelerate into the arc extinguishing device. The arc extinguishing grid sheet 2 separates the arc into a plurality of short arcs. Part of the short arcs will quickly spread to both sides of the arc extinguishing device along the surface of the arc-shaped claw 131 of the gas production sheet 1 and move towards the gas outlet 41. The end of the arc-shaped claw 131 abuts against the inner wall of the arc extinguishing cover 3, and the arc-shaped claw 131 is inserted into the gap between the arc extinguishing grid sheets 2 one by one, thereby blocking the end of the arc extinguishing grid sheet 2 close to the pin 21, preventing the high-pressure gas from entering the space between the pin 21 and the gas production sheet 1, and allowing the high-pressure gas to only contact the surface of one side of the gas production sheet 1, so that the high-pressure gas can only move towards the gas outlet 41 along the surface of the arc-shaped claw 131, preventing the high-pressure gas from forming a vortex flow on both sides of the arc extinguishing chamber and entering the other side of the gas production sheet 1, and avoiding the high-pressure gas impacting the other side surface of the gas production sheet 1 to cause the gas production sheet 1 to fall off.

[0055] Example 3

[0056] The embodiment provides an implementation of a circuit breaker, an arc extinguishing device is installed in the circuit breaker, when the circuit breaker works, internal contacts are separated, a main circuit is disconnected, when the contacts are separated, an arc is usually generated, the generated arc enters the arc extinguishing device through an arc guide plate 5, the arc extinguishing device extinguishes the arc, and damage of the arc to the circuit breaker is avoided.

[0057] Obviously, the above embodiment is only an example for clearly illustrating, but not limitation to the implementation. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the implementations do not need to be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A gas generating sheet characterized by comprising: The arc-shaped claw (131) is adapted to be inserted between two adjacent arc-extinguishing vanes (2) in the arc-extinguishing device, and the interval distance between two adjacent arc-shaped claws (131) is adapted to accommodate one arc-extinguishing vane (2) in the arc-extinguishing device. The fitting surface is a plane adapted to fit with the mounting surface of the arc-extinguishing device.

2. The gas generating sheet according to claim 1, wherein The mounting portion (11) is provided with a plurality of elastic insertion buckles (15) arranged at intervals.

3. The gas generating sheet according to claim 2, wherein The end of the mounting portion (11) away from the connecting portion (12) is provided with a bending section (14), and the bending direction of the bending section (14) is the same as the direction of the fitting surface.

4. The gas generating sheet according to any one of claims 1 to 3, wherein The side of the bending section (14) connected with the fitting surface is arranged obliquely relative to the fitting surface.

5. The gas generating sheet according to claim 4, wherein The end of the bending section (14) is a plane adapted to fit with the mounting surface of the arc-extinguishing device.

6. The gas generating sheet according to claim 5, wherein The arc-shaped claw (131) is adapted to be inserted between two adjacent arc-extinguishing vanes (2) in the arc-extinguishing device, and the interval distance between two adjacent arc-shaped claws (131) is adapted to accommodate one arc-extinguishing vane (2) in the arc-extinguishing device.

7. An arc extinguishing device, characterized in that The mounting portion (11) is provided with a plurality of elastic insertion buckles (15) arranged at intervals, and the inner wall of the arc-extinguishing cover (3) for connecting the mounting portion (11) is provided with a plurality of insertion holes (31) matched with the elastic insertion buckles (15). The arc-extinguishing device comprises the arc-extinguishing device according to any one of claims 7 or 8.

8. The device of claim 7, wherein, ​ 9. A circuit breaker characterized by, ​

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