A circuit breaker

Abstract

A circuit breaker belongs to the technical field of low-voltage electrical appliances. It includes a shell, an arc extinguishing chamber, and an extinguishing assembly. A cavity is provided in the shell, and the arc extinguishing chamber and the extinguishing assembly are placed in the cavity. The high-temperature gas in the arc extinguishing chamber is discharged to the outside of the shell through the extinguishing assembly. The arc extinguishing chamber includes a group of arc extinguishing grids in an array. Features: The extinguishing assembly is arranged at one end of a group of arc extinguishing grids in the array, so that the distance between the extinguishing assembly and each arc extinguishing grid in a group of arc extinguishing grids in the array increases successively from one end to the other end in the array direction. Advantages: It can effectively discharge the internal high-temperature gas to the outside of the circuit breaker, will not cause the extinguishing assembly to short-circuit with the incoming line end conductive bar, will not affect the creepage distance between the moving contact and the incoming line end conductive bar, will not cause the grids in the arc extinguishing grids to short-circuit, and at the same time ensure the compactness of the internal structure of the circuit breaker.

Description

Technical Field

[0001] The invention belongs to the technical field of low-voltage electrical appliances, and in particular relates to a circuit breaker. Background Art

[0002] With the continuous advancement of power grid technology, the system loop design capacity is getting higher and higher, requiring the existing circuit breakers to be continuously integrated and miniaturized, and the short-circuit fault current breaking capacity to be continuously improved. It is generally inevitable that when the circuit breaker is breaking a short-circuit fault current of more than 50kA, the original arc extinguishing system inside the circuit breaker cannot completely eliminate the high-temperature free gas generated by the short-circuit breaking. The high-temperature free gas is ejected out of the circuit breaker body, which can easily cause phase breakdown, parts burning and even accidents. Therefore, an anti-ionization component is usually placed at the far end of the air outlet of the arc extinguishing chamber inside the circuit breaker to fully cool the ejected high-temperature gas. The anti-ionization component is generally composed of one or more layers of metal woven wire mesh, or one or more metal porous plates. Figure 1 As shown, in a traditional molded case circuit breaker, the deionization component 3 is generally placed between the arc extinguishing chamber 2 and the gas outlet along the height direction of the circuit breaker. The disadvantage is that the deionization component 3 may greatly reduce the creepage distance between the moving contact 4 and the conductive bar at the incoming line end, thereby reducing the withstand voltage performance of the circuit breaker itself. At the same time, due to the relatively large energy generated by the disconnection, the deionization component 3 fails to eliminate the metal particles discharged along with the high-temperature gas in time, resulting in the arc passing through the deionization component 3 and the conductive bar at the incoming line end short-circuiting, or the arc passing through the deionization component 3 causing the arc extinguishing grid 21 to short-circuit, thereby losing the arc extinguishing function and reducing the arc extinguishing effect.

[0003] In view of the above-mentioned prior art, it is necessary to reasonably improve the location structure of the free-dissociation component in the existing circuit breaker. To this end, the applicant has made a useful design, and the technical solution to be introduced below is produced under this background. Summary of the invention

[0004] The task of the present invention is to provide a circuit breaker which can effectively discharge the internal high-temperature gas to the outside of the circuit breaker, will not cause a short circuit between the deionization component and the incoming line conductive bar, will not affect the creepage distance between the moving contact and the incoming line conductive bar, will not cause a short circuit in the arc extinguishing grid, and at the same time, the deionization component is built into the circuit breaker, ensuring the compactness of the internal structure of the circuit breaker.

[0005] The task of the present invention is accomplished in this way. A circuit breaker includes a shell, an arc extinguishing chamber, and an extinguishing assembly. The shell is provided with a cavity, and the arc extinguishing chamber and the extinguishing assembly are placed in the cavity. The high-temperature gas in the arc extinguishing chamber is discharged to the outside of the shell through the extinguishing assembly. The arc extinguishing chamber includes a group of arc extinguishing grids in an array, and is characterized in that: the extinguishing assembly is arranged at one end of a group of arc extinguishing grids in the array, so that the distance between the extinguishing assembly and each arc extinguishing grid in the group of arc extinguishing grids in the array increases successively from one end to the other end in the array direction.

[0006] In a specific embodiment of the present invention, the array direction of the group of arc-extinguishing grids extends along the height direction of the circuit breaker.

[0007] In another specific embodiment of the present invention, an anti-ionization accommodating cavity is provided at the upper end in the direction of the arc extinguishing grid array, and the anti-ionization assembly is placed in the anti-ionization accommodating cavity.

[0008] In another specific embodiment of the present invention, an anti-ionization accommodating cavity is provided at the lower end in the direction of the arc extinguishing grid array, and the anti-ionization assembly is placed in the anti-ionization accommodating cavity.

[0009] In yet another specific embodiment of the present invention, an air outlet is provided above the cavity, and the bottom of the air outlet is connected to the air outlet side of the deionization component.

[0010] In yet another specific embodiment of the present invention, an air outlet is provided below the chamber, and the top of the air outlet is connected to the air outlet side of the deionization component.

[0011] In a further specific embodiment of the present invention, an air outlet channel is formed between the rear end of the arc extinguishing grid and the inner wall of the cavity, and an L-shaped exhaust channel is formed between the air outlet channel and the air outlet.

[0012] The present invention has the beneficial effects of adopting the above structure: the deionization component is built into the circuit breaker to ensure the compactness of the internal structure of the circuit breaker; at the same time, the deionization component is arranged at one end of the arc extinguishing grid array direction, and forms an L-shaped exhaust channel with the circuit breaker outlet to discharge the high-temperature gas to the outside of the circuit breaker, which will not cause the deionization component to be short-circuited with the incoming line end conductive bar, will not cause the grids in the arc extinguishing grid to be short-circuited, and will not affect the creepage distance between the moving contact and the incoming line end conductive bar. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the circuit breaker described in the prior art.

[0014] Figure 2 This is a schematic diagram of the structure in which the ion-eliminating component is placed above the arc extinguishing chamber in one embodiment of the circuit breaker described in the present invention.

[0015] Figure 3 This is a schematic structural diagram of another embodiment of the circuit breaker of the present invention in which the ion elimination component is placed below the arc extinguishing chamber.

[0016] Figure 4 It is a schematic diagram of the structure of the arc extinguishing grid in another embodiment of the present invention.

[0017] Figure 5 It is a schematic diagram of the structure of the arc extinguishing grid in another embodiment of the present invention.

[0018] In the figure: 1. shell, 11. cavity, 111. deionization accommodating cavity, 1111. air inlet, 112. air outlet, 113. inner wall, 114. air outlet channel; 2. arc extinguishing chamber, 21. arc extinguishing grid, 211. slot, 212. chamfer; 3. deionization assembly; 4. moving contact; 5. stationary contact; 6. rotating shaft. DETAILED DESCRIPTION

[0019] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but the description of the embodiments is not a limitation of the technical solution. Any changes in form rather than substance based on the concept of the present invention should be regarded as the protection scope of the present invention.

[0020] In the following description, all concepts related to directionality or orientation such as up, down, left, right, front and back are based on the positions shown in the corresponding drawings, and therefore cannot be understood as a special limitation on the technical solution provided by the present invention.

[0021] See also Figure 2 , Figure 3 The present invention relates to a circuit breaker, comprising a housing 1, an operating mechanism (not shown in the figure), a handle (not shown in the figure), a rotating shaft 6, an arc extinguishing chamber 2, an extinguishing assembly 3, a contact system, and a tripper system (not shown in the figure). The contact system comprises a moving contact 4 and a stationary contact 5. When the circuit breaker is switched on and off, the handle drives the operating mechanism to move, and the operating mechanism drives the rotating shaft 6 to move after the operation, and the rotating shaft 6 drives the moving contact 4 to achieve contact or separation with the stationary contact 5, that is, the contact system is operated.

[0022] like Figure 2 , Figure 3As shown, the deionization assembly 3 is arranged on one side of the moving contact 4, and a cavity 11 is provided in the housing 1, and the arc extinguishing chamber 2 and the deionization assembly 3 are placed in the cavity 11. The arc extinguishing chamber 2 includes a group of arc extinguishing grids 21 in an array, and the direction of the array is the direction in which the arc extinguishing grids 21 are arranged and extended. In this embodiment, the array direction of the group of arc extinguishing grids 21 extends along the height direction of the circuit breaker, and the distance between the deionization assembly 3 and each arc extinguishing grid in the group of arc extinguishing grids 21 in the array increases from one end to the other end in the array direction. The specific installation position of the deionization assembly 3 is specifically described by the following embodiments. Example 1

[0023] like Figure 2As shown in the figure, in this embodiment, a deionization accommodation cavity 111 is provided at the upper end in the array direction of the arc extinguishing grid sheets 21. The deionization accommodation cavity 111 is closely attached to the upper end of the arc extinguishing grid sheets 21 or is spaced from the arc extinguishing grid sheets 21 by a certain distance. The deionization component 3 is placed in the deionization accommodation cavity 111. An air outlet 112 is provided above the accommodation cavity 11. The air outlet 112 is communicated with the air outlet side of the deionization component 3. An air inlet 1111 is opened at the bottom of the deionization accommodation cavity 111. The air inlet 1111 is communicated with the arc extinguishing chamber. An air outlet channel 114 is formed between the rear end of the arc extinguishing grid sheets 21 and the inner wall 113 of the accommodation cavity 11. The air outlet channel 114 and the air inlet 1111 form an L-shaped exhaust channel with the air outlet 112. The deionization component 3 is generally composed of one or more layers of metal woven wire meshes stacked交错叠加 (interleaved and superimposed) or can be composed of one or more metal perforated plates stacked交错叠加 (interleaved and superimposed). The metal woven wire mesh can be a metal woven wire mesh with different structures or different porosities, or a metal woven wire mesh with the same structure or the same porosity; the metal perforated plate can be a metal perforated plate with different structures or different porosities, or a metal perforated plate with the same structure or the same porosity. During specific use, when the moving contact 4 and the static contact 5 of the circuit breaker break the short-circuit current, high-temperature ionized gas will be generated and ejected from the arc extinguishing chamber 2. The deionization component 3 is placed in the deionization accommodation cavity 111 along the height direction of the circuit breaker. The distance from the deionization component 3 to each arc extinguishing grid sheet in a group of arc extinguishing grid sheets in the array increases sequentially from one end to the other end in the array direction. That is, the distance from the deionization component 3 to the first arc extinguishing grid sheet at the lower end is L1, the distance to the second arc extinguishing grid sheet next to the first arc extinguishing grid sheet at the lower end is L2, and so on. The distance to the last arc extinguishing grid sheet in the array direction is Ln, and the distances L1 < L2 <... < Ln. The deionization accommodation cavity 111 is closely attached to the upper end of the arc extinguishing grid sheets 21 or is spaced from the arc extinguishing grid sheets 21 by a certain distance. The high-temperature gas enters the deionization component 3 through the air inlet 1111, and after being fully cooled by the deionization component 3, it is discharged to the outside of the circuit breaker through the air outlet 112. The added deionization component 3 in this way will not cause the deionization component 3 to be short-circuited with the incoming line conductive bar, and will not affect the creepage distance between the moving contact 4 of the circuit breaker and the incoming line conductive bar, and will not cause several of the arc extinguishing grid sheets 21 to be short-circuited, thereby reducing the number of arc extinguishing grid sheets 21 participating in the arc extinguishing effect and resulting in a reduction in the arc extinguishing effect. At the same time, the compactness of the internal structure of the circuit breaker is ensured. Embodiment 2

[0024] As Figure 3As shown in the figure, in this embodiment, a deionization accommodation cavity 111 is provided at the lower end in the array direction of the arc extinguishing grid plates 21. The deionization component 3 is placed in the deionization accommodation cavity 111, and the distance from each arc extinguishing grid plate in a group of arc extinguishing grid plates 21 in the array direction increases sequentially from one end to the other end of the array direction. That is, the distance between the deionization component 3 and the first arc extinguishing grid plate at the upper end is L1, the distance from the second arc extinguishing grid plate next to the first arc extinguishing grid plate at the upper end is L2, and so on. The distance from the last arc extinguishing grid plate in the array direction is Ln, and the distances L1 < L2 <... < Ln. The deionization accommodation cavity 111 is closely attached to the lower end of the arc extinguishing grid plates 21 or is spaced from the arc extinguishing grid plates 21 by a certain distance. An air inlet 1111 is provided at the top of the deionization accommodation cavity 111, and the air inlet 1111 is communicated with the arc extinguishing chamber. An air outlet 112 is provided below the cavity 11, and the top of the air outlet 112 is communicated with the air outlet side of the deionization component 3. An air outlet channel 114 is formed between the rear end of the arc extinguishing grid plates 21 and the inner wall 113 of the cavity 11. The air outlet channel 114 forms an L-shaped exhaust channel between the air inlet 1111 and the air outlet 112. The deionization component 3 is generally composed of one or more layers of metal woven wire meshes stacked交错叠加 (interleaved and superimposed), and can also be composed of one or more metal perforated plates stacked交错叠加 (interleaved and superimposed). The metal woven wire mesh can be a metal woven wire mesh with different structures or different porosities, or a metal woven wire mesh with the same structure or the same porosity; the metal perforated plate can be a metal perforated plate with different structures or different porosities, or a metal perforated plate with the same structure or the same porosity. The specific use is the same as that described in Embodiment 1. Embodiment 3

[0025] As Figure 4 As shown in the figure, in this embodiment, a groove 211 is provided on the arc extinguishing grid plates 21. When the rear end of the arc extinguishing grid plates 21 abuts against the inner wall 113 of the cavity 11, an air outlet channel 114 is formed between the groove 211 and the inner wall 113 of the cavity 11. The air outlet channel 114 forms an L-shaped exhaust channel between the air inlet 1111 and the air outlet 112. The specific use is the same as that described in Embodiment 1. Embodiment 4

[0026] As Figure 5 As shown in the figure, in this embodiment, a chamfer 212 (which can also be a fillet) is provided on the arc extinguishing grid plates 21. When the rear end of the arc extinguishing grid plates 21 abuts against the inner wall 113 of the cavity 11, an air outlet channel 114 is formed between the chamfer 212 and the inner wall 113 of the cavity 11. The air outlet channel 114 forms an L-shaped exhaust channel between the air inlet 1111 and the air outlet 112. The specific use is the same as that described in Embodiment 1.

Claims

1. A circuit breaker, comprising a housing (1), an arc extinguishing chamber (2), and an ion extinguishing assembly (3), wherein a cavity (11) is provided in the housing (1), the arc extinguishing chamber (2) and the ion extinguishing assembly (3) are placed in the cavity (11), and high-temperature gas in the arc extinguishing chamber (2) is discharged to the outside of the housing (1) through the ion extinguishing assembly (3), the arc extinguishing chamber (2) comprises a group of arc extinguishing grids (21) in an array, characterized in that: The deionization component (3) is arranged at one end of a group of arc extinguishing grids (21) of the array, so that the distance between the deionization component (3) and each arc extinguishing grid in the group of arc extinguishing grids (21) of the array increases sequentially from one end to the other end in the array direction.

2. A circuit breaker according to claim 1, characterized in that: The array direction of the group of arc-extinguishing grids (21) extends along the height direction of the circuit breaker.

3. A circuit breaker according to claim 1, characterized in that: An anti-ionization accommodating chamber (111) is provided at the upper end of the arc extinguishing grid (21) in the array direction, and the anti-ionization assembly (3) is placed in the anti-ionization accommodating chamber (111).

4. A circuit breaker according to claim 1, characterized in that: An anti-ionization accommodating chamber (111) is provided at the lower end of the arc extinguishing grid (21) in the array direction, and the anti-ionization assembly (3) is placed in the anti-ionization accommodating chamber (111).

5. A circuit breaker according to claim 3, characterized in that: An air outlet (112) is provided above the chamber (11), and the air outlet (112) is connected to the air outlet side of the deionization component (3).

6. A circuit breaker according to claim 4, characterized in that: An air outlet (112) is provided below the chamber (11), and the air outlet (112) is connected to the air outlet side of the deionization component (3).

7. A circuit breaker according to claim 5 or 6, characterized in that: An air outlet channel (114) is formed between the rear end of the arc extinguishing grid (21) and the inner wall (113) of the cavity (11), and an L-shaped exhaust channel is formed between the air outlet channel (114) and the air outlet (112).

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