A kind of arc extinguishing chamber structure and circuit breaker

Abstract

The present invention provides an arc extinguishing chamber structure and a circuit breaker having the arc extinguishing chamber structure. The arc extinguishing chamber structure includes an arc-isolating wall, an arc-extinguishing grid group and a flame-extinguishing piece. The arc-isolating wall has an arc-extinguishing cavity and an arc-strike opening and an installation opening connected to the arc-extinguishing cavity. The arc-extinguishing grid group is assembled in the arc-extinguishing cavity, and the flame-extinguishing piece is assembled on the installation opening. The flame-extinguishing piece includes a first flame-extinguishing piece and a second flame-extinguishing piece stacked and arranged at a certain interval in a direction away from the arc-extinguishing cavity. A positioning support is arranged in the gap between the first flame-extinguishing piece and the second flame-extinguishing piece. The positioning support can effectively fix and support the position between the two flame-extinguishing pieces, will not be deformed by blowing due to high pressure, effectively prevent arc channel blockage, and the structure of the arc extinguishing chamber is compact, effectively improving the breaking capacity of the product.

Description

Technical Field

[0001] The invention relates to the field of circuit breakers, and in particular to an arc extinguishing chamber structure and a circuit breaker having the arc extinguishing chamber structure. Background Art

[0002] The arc extinguishing chamber is an indispensable part of the circuit breaker. The function of the arc extinguishing chamber is to eliminate the arc generated when the product is disconnected. The arc extinguishing chamber's ability to extinguish the arc directly affects the circuit breaker's breaking performance. The typical structure of the existing circuit breaker arc extinguishing chamber is mainly composed of an arc extinguishing grid, an arc extinguishing wall, an arc striking plate, and a flame extinguishing plate. The main functions of this arc extinguishing chamber structure are: the arc striking plate introduces the arc into the arc extinguishing chamber when the arc is generated, and then the arc is extinguished by the arc extinguishing grid of the arc extinguishing chamber. The function of the flame extinguishing plate is to extinguish the remaining arc within the arc extinguishing chamber, which plays a role in cutting off the arc and preventing the arc from flying out and causing safety hazards.

[0003] The two flame extinguishing plates in the existing arc extinguishing chamber are positioned in a circle. When the product breaks a large current, the air pressure is high, which will deform the flame extinguishing plate below (referring to the flame extinguishing plate closer to the arc extinguishing chamber), causing the upper and lower flame extinguishing plates to stick to each other and block the exhaust hole, resulting in poor exhaust and arc blocking in the arc extinguishing chamber, thus affecting breaking. Summary of the invention

[0004] To this end, the present invention provides an arc extinguishing chamber structure and a circuit breaker having the arc extinguishing chamber structure, which can effectively solve the above problems.

[0005] To achieve the above purpose, the technical solution provided by the present invention is as follows:

[0006] An arc extinguishing chamber structure comprises an arc-isolating wall, an arc-extinguishing grid group and a flame-extinguishing plate. The arc-isolating wall has an arc-extinguishing cavity and an arc-strike opening and a mounting opening connected to the arc-extinguishing cavity. The arc-extinguishing grid group is assembled in the arc-extinguishing cavity, and the flame-extinguishing plate is assembled on the mounting opening. The flame-extinguishing plate comprises a first flame-extinguishing plate and a second flame-extinguishing plate which are stacked at a certain interval in a direction away from the arc-extinguishing cavity, and a positioning support is arranged in the gap between the first flame-extinguishing plate and the second flame-extinguishing plate.

[0007] Furthermore, the positioning support member is also extended with an insertion portion, and is inserted into the through hole of the first flame extinguishing piece or the second flame extinguishing piece through the insertion portion.

[0008] Furthermore, the positioning support corresponds to the middle position of the first flame extinguishing piece and the second flame extinguishing piece.

[0009] Furthermore, there are multiple positioning supports, which are distributed at a certain interval.

[0010] Furthermore, two positioning grooves arranged at an interval are formed on the inner side wall of the installation opening, and the first flame-extinguishing piece and the second flame-extinguishing piece are respectively clamped in the two positioning grooves.

[0011] Furthermore, the arc isolation wall is also equipped with a protective cover plate located outside the installation opening, and the protective cover plate is provided with ventilation slots corresponding to the installation opening.

[0012] Furthermore, a wavy iron mesh having through holes is provided between the second flame extinguishing piece located on the outer layer of the first flame extinguishing piece and the protective cover plate.

[0013] Furthermore, the arc isolation wall is a ∏-shaped structure formed by connecting two L-shaped arc isolation plates, and the arc striking opening and the installation opening are respectively located at the lower end and the upper end of the ∏-shaped arc isolation wall.

[0014] Furthermore, an arc striking plate is provided in the arc extinguishing chamber, and the arc striking plate extends to the arc striking opening.

[0015] A circuit breaker comprises at least the arc extinguishing chamber structure described above.

[0016] The technical solution provided by the present invention has the following beneficial effects:

[0017] The positioning support member arranged in the gap between the first flame extinguishing plate and the second flame extinguishing plate can effectively fix and support the position between the two flame extinguishing plates, will not be blown out of shape due to high pressure, effectively prevents arc channel blockage, and the arc extinguishing chamber has a compact structure, effectively improving the breaking capacity of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure shows a three-dimensional schematic diagram of the arc extinguishing chamber structure in the embodiment;

[0019] Figure 2 Shown is a top view of the arc extinguishing chamber structure in the embodiment;

[0020] Figure 3 Shown is a bottom view of the arc extinguishing chamber structure in the embodiment;

[0021] Figure 4 The figure shows the internal structure of the arc extinguishing chamber structure in the embodiment after one of the arc isolation plates is hidden;

[0022] Figure 5 Shown Figure 4 A schematic diagram of a partial structural breakdown of the structure shown;

[0023] Figure 6 Shown Figure 4 A schematic diagram of a partial structural breakdown at another angle of the structure shown;

[0024] Figure 7 The figure shows a schematic diagram of the structural decomposition of the arc extinguishing chamber structure in a three-dimensional view in the embodiment.

[0025] Specifically, the orientation shown in the method view in this figure is not limited to the method in actual application. DETAILED DESCRIPTION

[0026] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0027] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0028] Reference Figures 1 to 7 As shown, an arc extinguishing chamber structure provided in this embodiment includes an arc isolation wall 10, an arc extinguishing grid group 21, an arc striking piece 22 and a flame extinguishing piece. The arc isolation wall 10 has an arc extinguishing cavity 100 and an arc striking opening 102 and a mounting opening 101 communicating with the arc extinguishing cavity 100. The arc extinguishing grid group 21 and the arc striking piece 22 are mounted in the arc extinguishing cavity 100, and the arc striking piece 22 also extends to the arc striking opening 102 for arc striking. The flame extinguishing piece is mounted on the mounting opening 101. Specifically, the flame extinguishing piece includes a first flame extinguishing piece 31 and a second flame extinguishing piece 32 which are stacked and arranged at a certain interval in a direction away from the arc extinguishing cavity (i.e., in an upward direction in the figure), i.e., the first flame extinguishing piece 31 is closer to the arc extinguishing cavity 100, and the second flame extinguishing piece 32 is located on the side of the first flame extinguishing piece 31 away from the arc extinguishing cavity 100. A positioning support 40 is arranged in the gap between the first flame extinguishing piece 31 and the second flame extinguishing piece 32.

[0029] The working principle of the arc extinguishing chamber structure is the same as that of the existing structure, that is, the arc striking piece 22 extending to the arc striking opening 102 is connected to the static contact, and the arc is introduced into the arc extinguishing chamber 100 when the arc is generated, and then the arc is extinguished by the arc extinguishing grid piece group 21 in the arc extinguishing chamber 100. The function of the flame extinguishing piece is to extinguish the remaining arc within the arc extinguishing chamber 100, play the role of cutting off the arc, and prevent the arc from flying out and causing safety hazards.

[0030] The setting of the positioning support member 40 can support the two flame extinguishing plates (i.e., the first flame extinguishing plate 31 and the second flame extinguishing plate 32), so that the first flame extinguishing plate 31 and the second flame extinguishing plate 32 can always maintain a certain gap, that is, it can effectively fix and support the position of the two flame extinguishing plates, and will not be blown out of shape due to high pressure, thereby causing overlap, effectively preventing the arc channel from being blocked, and the structure of the arc extinguishing chamber is compact, which effectively improves the breaking capacity of the product.

[0031] Furthermore, in this embodiment, the positioning support member 40 is also extended with an insertion portion 41, and is inserted into the through hole of the first flame extinguishing piece 31 through the insertion portion 41. Such a configuration can effectively fix the position of the positioning support member 40, so that it remains in a specific preferred position, and prevent the positioning support member 40 from moving in the gap between the first flame extinguishing piece 31 and the second flame extinguishing piece 32 to cause unstable support, or even collision noise, etc.; and the fixing method by insertion is simple, easy to load and unload, and change the fixed position, that is, when the position needs to be changed, just pull out the positioning support member 40, and then insert it into the through hole of the first flame extinguishing piece 31 at the corresponding position. Of course, in other embodiments, the positioning support member 40 can also be inserted into the through hole of the second flame extinguishing piece 32, and the effect is the same. Alternatively, in other embodiments, the positioning support member 40 can also be fixed by non-detachable methods such as bonding and welding, or not fixed.

[0032] Furthermore, the number of the positioning support members 40 is multiple, and the number in this specific embodiment is three. The three positioning support members 40 are distributed at a certain interval to form three support points, which will have a better and more stable support effect; and will not block too much ventilation area. Of course, in other embodiments, the number of positioning support members 40 is not limited to this, and can also be one, two, or more than three.

[0033] Furthermore, in this embodiment, the positioning support member 40 corresponds to the middle position of the first flame extinguishing piece 31 and the second flame extinguishing piece 32; if the three positioning support members 40 in this embodiment are all located in the middle position of the center, the middle position is the position with the largest deformation, and the positioning support member 40 is supported in the middle position, and its support effect is the best. Of course, in other embodiments, the specific setting position of the positioning support member 40 is not limited to this, as long as it can meet the requirements that under a certain pressure, the first flame extinguishing piece 31 and the second flame extinguishing piece 32 will not overlap due to deformation caused by blowing.

[0034] Furthermore, in this embodiment, two positioning grooves are formed on the inner side wall of the installation opening 101, i.e., the first positioning groove 14 and the second positioning groove 13, and the first flame extinguishing piece 31 and the second flame extinguishing piece 32 are respectively engaged in the two positioning grooves, i.e., the first flame extinguishing piece 31 is engaged in the first positioning groove 14, and the second flame extinguishing piece 32 is engaged in the second positioning groove 13. The two positioning grooves limit and fix the outer periphery of the first flame extinguishing piece 31 and the second flame extinguishing piece 32, and play a role in positioning and assembling. Of course, in other embodiments, the positioning and assembling of the first flame extinguishing piece 31 and the second flame extinguishing piece 32 are not limited to this.

[0035] Furthermore, in this embodiment, the arc isolation wall 10 is also equipped with a protective cover plate 60 located outside the installation opening 101, and the protective cover plate 60 plays a role of fixing and protecting. Specifically, the protective cover plate 60 is provided with a ventilation slot 61 corresponding to the installation opening 101 for ventilation.

[0036] Furthermore, in this embodiment, a wavy iron mesh 50 with through holes is provided between the second flame extinguishing piece 32 located on the outer layer of the first flame extinguishing piece 31 and the protective cover plate 60. The wavy iron mesh 50 has the function of absorbing the arc, further realizing arc extinguishing, and the arc extinguishing effect is better.

[0037] Furthermore, in this embodiment, the arc-isolating wall 10 is a ∏-shaped structure formed by connecting two L-shaped arc-isolating plates 11 and 12. More specifically, the arc-striking opening 102 and the installation opening 101 are both formed by the two arc-isolating plates 11 and 12, and the arc-striking opening 102 and the installation opening 101 are respectively located at the lower end and the upper end of the ∏-shaped arc-isolating wall 10, which is more convenient for the installation, maintenance and disassembly of other components. Of course, in other embodiments, the arc-isolating wall 10 can also be integrally formed, or have other shapes of structures.

[0038] Specifically, in this embodiment, the arc extinguishing chamber structure has an arc striking piece 22. Through the arrangement of the arc striking piece 22, the arc generated by the circuit breaker opening and closing can be better introduced, and the arc striking effect is better. Of course, in other embodiments, the arc extinguishing chamber structure may also not need to adopt the arc striking piece 22 structure.

[0039] This embodiment also provides a circuit breaker, including the arc extinguishing chamber structure described above, wherein the arc striking piece 22 of the arc extinguishing chamber structure is connected to the static contact to achieve arc extinguishing when the circuit breaker is disconnected.

[0040] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. An arc extinguishing chamber structure, comprising an arc-isolating wall, an arc-extinguishing grid group and a flame-extinguishing sheet, wherein the arc-isolating wall has an arc-extinguishing cavity and an arc-strike opening and a mounting opening communicating with the arc-extinguishing cavity, the arc-extinguishing grid group is mounted in the arc-extinguishing cavity, and the flame-extinguishing sheet is mounted on the mounting opening; characterized in that: The flame extinguishing plate comprises a first flame extinguishing plate and a second flame extinguishing plate which are stacked at a certain interval in a direction away from the arc extinguishing cavity, and a positioning support is arranged in the gap between the first flame extinguishing plate and the second flame extinguishing plate to fix and support the position between the first flame extinguishing plate and the second flame extinguishing plate; the positioning support also extends with an insertion portion, and is inserted into the through hole of the first flame extinguishing plate or the second flame extinguishing plate through the insertion portion.

2. The arc extinguishing chamber structure according to claim 1, characterized in that: The number of the positioning support members is multiple and they are distributed at a certain interval.

3. The arc extinguishing chamber structure according to claim 1, characterized in that: The positioning support corresponds to the middle position of the first flame extinguishing piece and the second flame extinguishing piece.

4. The arc extinguishing chamber structure according to claim 1, characterized in that: Two positioning grooves arranged at a distance from each other are formed on the inner side wall of the installation opening, and the first flame extinguishing piece and the second flame extinguishing piece are respectively clamped in the two positioning grooves.

5. The arc extinguishing chamber structure according to claim 1, characterized in that: The arc isolation wall is also equipped with a protective cover plate located outside the installation opening, and the protective cover plate is provided with ventilation slots corresponding to the installation opening.

6. The arc extinguishing chamber structure according to claim 5, characterized in that: A wavy iron mesh with through holes is also arranged between the second flame extinguishing piece located on the outer layer of the first flame extinguishing piece and the protective cover plate.

7. The arc extinguishing chamber structure according to claim 1, characterized in that: The arc-isolating wall is a ∏-shaped structure formed by connecting two L-shaped arc-isolating plates, and the arc-starting opening and the installation opening are respectively located at the lower end and the upper end of the ∏-shaped arc-isolating wall.

8. The arc extinguishing chamber structure according to claim 1, characterized in that: An arc striking piece is also provided in the arc extinguishing chamber, and the arc striking piece also extends to the arc striking opening.

9. A circuit breaker, characterized in that: At least comprises the arc extinguishing chamber structure described in any one of claims 1 to 8 above.

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