Exhaust device of circuit breaker

Abstract

The utility model discloses an exhaust device of a circuit breaker. The exhaust device comprises a shell, an arc extinguish chamber, a fixed sheet and a movable sheet, the arc extinguish chamber is arranged in the shell, the fixed sheet is located at the rear part of the arc extinguish chamber, and the fixed sheet is provided with an exhaust hole which is used for exhausting gas; the movable piece is located on the surface, deviating from the arc extinguish chamber, of the fixed piece, the movable piece comprises a fixed part and a movable part which are connected, the fixed part is arranged on the shell, the movable part seals the exhaust hole in an undeformed state, and the movable part deforms when being blown by gas, so that the exhaust hole is exposed, and gas in the circuit breaker is conveniently exhausted; wherein the movable part comprises at least two sub movable parts which are arranged side by side, and the deformation of each sub movable part is mutually independent; the exhaust device has the advantage of being good in exhaust effect.

Description

Technical Field

[0001] The present application relates to the field of low-voltage electrical equipment and is a circuit breaker, specifically an exhaust device for a circuit breaker. Background Art

[0002] In the field of molded case circuit breakers, when the product is in extreme disconnection, high-heat arc gas is often generated inside. At this time, an exhaust device is required to exhaust the gas, otherwise the product may explode.

[0003] The existing exhaust structure, such as the structure disclosed in CN209328832U, includes a base, an insulating cover, a fixed sheet, and a movable sheet. The fixed sheet is provided with an exhaust hole. The fixed sheet is arranged on one side of the arc extinguishing chamber, and the movable sheet is arranged on a surface of the fixed sheet away from the arc extinguishing chamber. Under normal conditions, the movable sheet blocks the exhaust hole. When the gas from the arc extinguishing chamber is relatively large, the movable sheet can be blown to bend it, and the exhaust hole is exposed at this time, and the gas is exhausted through the exhaust hole. The movable part of the existing movable sheet is an integral part (which can be understood as a movable part of a single-piece structure), and its structural size is relatively large, and a relatively large driving force is required to bend and deform it to open the exhaust hole (it can also be said that a large arc pressure is required inside the product to open the exhaust). If the internal air pressure of the product is relatively small or unstable, the exhaust effect of the circuit breaker of this structure will be very unsatisfactory, which is easy to affect the breaking performance of the product.

[0004] Therefore, how to design an exhaust structure that has lower arc gas pressure requirements than the existing structure to improve the exhaust effect of the product has become a problem worth studying. Summary of the invention

[0005] In view of this, the purpose of the present application is to overcome the deficiencies in the prior art and to provide an exhaust device for a circuit breaker that can improve the exhaust effect.

[0006] The present application provides: an exhaust device for a circuit breaker, comprising a shell, an arc extinguishing chamber, a fixed plate and a movable plate; the arc extinguishing chamber is arranged inside the shell, the fixed plate is located at the rear of the arc extinguishing chamber, an exhaust hole is arranged on the fixed plate, and the exhaust hole is used to exhaust gas; the movable plate is located on a surface of the fixed plate away from the arc extinguishing chamber, the movable plate comprises a connected fixed part and a movable part, the fixed part is arranged on the shell, the movable part closes the exhaust hole in an undeformed state, and the movable part is deformed when blown by gas to expose the exhaust hole to facilitate the exhaust of gas in the circuit breaker; wherein the movable part is at least two sub-movable parts arranged side by side, and the deformation of each sub-movable part is independent of each other.

[0007] With this structure, a movable part formed by at least two sub-movable parts is used to replace a single movable part in the prior art. The size of this sub-movable part is relatively small, and it is easier to deform. It can be opened when it is blown by a small airflow, which greatly improves the exhaust effect. This exhaust effect can be specifically reflected in the following aspects: First, when the airflow is small, the deformation of this sub-movable part will be easier than the prior art (a single movable part), and even when the airflow is small, it can have a better exhaust effect. Second, when the airflow is large, the deformation speed of this sub-movable part is faster than that of the prior art (a single movable part), and the exhaust hole can be quickly exposed and the exhaust can be quickly exhausted. Third, since the airflow is uniform in an ideal state, but it is often uneven in reality, the deformation of each sub-movable part is independent of each other, which makes it easier to deal with uneven airflow (a single movable part in the prior art is difficult to adapt to uneven airflow, and the exhaust effect is very unsatisfactory), and has a better exhaust effect.

[0008] In some embodiments of the present application, the shell includes a base and an upper cover, and the fixing plate is inserted into the base and / or the upper cover; or, the shell includes a base and an upper cover, and the fixing plate and the upper cover are integrally formed; or, the shell includes a base and an upper cover, and the fixing plate and the arc extinguishing chamber are integral.

[0009] There are many ways to design the fixing plate. The fixing plate may be plugged into the base and / or the upper cover, or may be integrally formed with the upper cover, or may be an integral part with the arc extinguishing chamber.

[0010] In some embodiments of the present application, the shell includes a base and an upper cover, and the fixed part is inserted into the base and / or the upper cover; the sub-movable part has a movable end and a connecting end, the connecting end is connected to the fixed part, and the movable end is arranged away from the fixed part; when the sub-movable part is in an undeformed state, the movable end is arranged adjacent to the base or the upper cover.

[0011] There are many ways to set the movable piece, which can be inserted on the base, inserted on the upper cover, or inserted on the base and the upper cover. In addition, when the movable part is not opened, the movable end of the sub-movable part can be arranged adjacent to the base or adjacent to the upper cover.

[0012] In some embodiments of the present application, each sub-movable part covers at least one exhaust hole, and the covered exhaust hole does not exceed the outer edge of the corresponding sub-movable part; a gap is formed between the outer edges of two adjacent sub-movable parts.

[0013] With this structure, each sub-movable part covers at least one exhaust hole, and the covered exhaust hole does not exceed the outer edge of the corresponding sub-movable part, so that the sub-movable part completely blocks the exhaust hole, which will help the airflow to blow the sub-movable part to open for exhaust, and have a more stable exhaust effect.

[0014] In some embodiments of the present application, the number of the exhaust holes is at least two groups, each group of exhaust holes is arranged along the height direction of the movable sheet, each group of exhaust holes is arranged within the connection between the movable part and the fixed part, and one group of exhaust holes is arranged next to the connection between the movable part and the fixed part; or, the exhaust holes are long strips, the length direction of the exhaust holes is consistent with the height direction of the movable sheet, each hole wall of the exhaust holes does not exceed the connection between the movable part and the fixed part, and one of the hole walls of the exhaust holes is arranged next to the connection between the movable part and the fixed part.

[0015] The exhaust holes can be arranged in multiple rows or in a long strip shape. Regardless of whether they are arranged in multiple rows or in a long strip shape, the exhaust holes are not arranged beyond the connection between the movable part and the fixed part. Such a structural design can make the exhaust holes more concentrated in the area covered by the movable part, making it easier for the airflow to converge on the sub-movable part, which is conducive to its bending and deformation.

[0016] In some embodiments of the present application, the fixed portion includes a base and two side portions, the two side portions are connected to the base, a gap is formed between the two side portions, all sub-movable portions are connected to the base and are located in the gap, and the heights of the two side portions are not higher than any sub-movable portion; or, the fixed portion includes a base and a first side portion, a second side portion, and a third side portion, the base is connected to the first side portion, the second side portion, and the third side portion to form a frame structure, and all sub-movable portions are connected to the base and are located in the frame structure.

[0017] There are many design forms of movable pieces, and no matter which form of movable piece is used, this independent sub-movable part structure can be used.

[0018] In some embodiments of the present application, the cross-sectional shape of the exhaust hole is a regular pattern or an irregular pattern; or, the number of the exhaust hole is one, and all the sub-movable parts jointly close the exhaust hole; or, the number of the exhaust holes is at least two, and at least one exhaust hole is closed by two sub-movable parts; or, the movable sheet is phenolic cardboard or Nomix paper.

[0019] With this structure, the shapes and quantity of the exhaust holes can be varied, and any form can be applied to the solution of multiple independently moving sub-movable parts.

[0020] In some embodiments of the present application, the shell includes a base and an upper cover, the base is provided with an arc extinguishing chamber groove, the arc extinguishing chamber is arranged in the arc extinguishing chamber groove and the top of the arc extinguishing chamber is arranged beyond the arc extinguishing chamber groove; it also includes an arc extinguishing chamber cover, the arc extinguishing chamber cover is arranged at the top of the arc extinguishing chamber; the arc extinguishing chamber cover is fixed to the base or the upper cover.

[0021] The arc extinguishing chamber cover design can improve the air tightness of the arc extinguishing chamber and make it easier for the gas to be collected and exhausted.

[0022] In some embodiments of the present application, the arc extinguishing chamber cover is fixed to the base or the upper cover by one or more of screw fastening, clip-on fixation, and tight fit.

[0023] Regardless of which of the above forms is used, the arc extinguishing chamber cover can be stably installed.

[0024] In some embodiments of the present application, the shell includes a base and an upper cover, there are at least two arc extinguishing chamber slots on the base, the number of arc extinguishing chambers corresponds to the number of arc extinguishing chamber slots, and the arc extinguishing chamber cover is arranged on the top of all arc extinguishing chambers; the arc extinguishing chamber cover is provided with an avoidance groove, and the avoidance groove is used to avoid the handle of the circuit breaker.

[0025] With this structure and the design of the avoidance groove, the handle of the circuit breaker is avoided to prevent the movement of the handle of the circuit breaker from affecting the arc extinguishing chamber cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A schematic diagram of the structure of a circuit breaker according to an embodiment of the present application is shown;

[0028] Figure 2 A schematic diagram of the structure of the circuit breaker after the upper cover is removed according to the embodiment of the present application is shown;

[0029] Figure 3 A schematic diagram of the structure of the exhaust device in the embodiment of the present application when it is not deformed is shown;

[0030] Figure 4 A schematic diagram of the structure of the exhaust device of the embodiment of the present application when deformed (blown open by gas) is shown;

[0031] Figure 5 A schematic structural diagram of one implementation of a movable plate in an exhaust device according to an embodiment of the present application is shown;

[0032] Figure 6 A schematic structural diagram of one implementation of a fixing plate in an exhaust device according to an embodiment of the present application is shown;

[0033] Figure 7 A schematic structural diagram showing another implementation of a fixing plate in an exhaust device according to an embodiment of the present application;

[0034] Figure 8 A structural schematic diagram showing another embodiment of a fixing plate in an exhaust device according to an embodiment of the present application is shown;

[0035] Figure 9-10 A schematic structural diagram showing two different deformation directions of the movable sheet in the exhaust device of the embodiment of the present application;

[0036] Figure 11-13 A schematic diagram of the structure of the movable sheet closing three different exhaust holes in the exhaust device of the embodiment of the present application is shown;

[0037] Fig.14 A structural schematic diagram showing another embodiment of the movable plate in the exhaust device of the embodiment of the present application;

[0038] Figure 15-16 A diagram showing the positional relationship between the movable plate and two different arrangements of exhaust holes in the exhaust device of an embodiment of the present application is shown. DETAILED DESCRIPTION

[0039] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0040] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0042] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature. Example

[0044] like Figure 1-Figure 16 As shown, an embodiment of the present application is a circuit breaker, which includes an exhaust device.

[0045] The shell includes a base 1 and an upper cover 2. The base 1 and the upper cover 2 are fastened by bolts, and three arc-extinguishing chamber grooves 11 are arranged side by side on the base 1. There are three arc-extinguishing chambers 12, which are respectively arranged in the three arc-extinguishing chamber grooves 11. Here, the top of the arc-extinguishing chamber 12 is arranged beyond the arc-extinguishing chamber groove 11, and the arc-extinguishing chamber cover 13 is arranged on the top of the arc-extinguishing chamber 12. Here, the arc-extinguishing chamber cover 13 is fixed to the base 1, and the fixation here is bolt fastening. Of course, in addition to this, the arc-extinguishing chamber cover 13 can also be fixed by snap-fitting or tight fitting, or a combination of several fastening methods. Here, in addition to being fixed to the base 1, the arc-extinguishing chamber cover 13 can also be fixed to the upper cover 2.

[0046] The operating mechanism includes a handle 3, and the opening and closing operations of the circuit breaker can be realized by the handle 3. The arc extinguishing chamber cover 13 is provided with an avoidance groove 14, and the avoidance groove 14 is designed to avoid the handle 3 to prevent the handle 3 from hitting the arc extinguishing chamber cover 13.

[0047] Since there are three arc extinguishing chambers 12 in this embodiment, the number of exhaust devices is also three. Since the structure of each exhaust device is basically the same, the structure of one exhaust device is taken as an example for explanation below:

[0048] The exhaust device includes a housing, an arc extinguishing chamber 12 , a fixed sheet 20 and a movable sheet 30 .

[0049] The fixed plate 20 is located at the rear of the arc extinguishing chamber 12, and an exhaust hole 21 is provided on the fixed plate 20, and the exhaust hole 21 is used to exhaust the gas. The movable plate 30 is located on a surface of the fixed plate 20 away from the arc extinguishing chamber 12. Simply put, the fixed plate 20 is between the arc extinguishing chamber 12 and the movable plate 30. The movable plate 30 here includes a fixed portion 31 and a movable portion. The fixed portion 31 is connected to the movable portion. The fixed portion 31 here is arranged on the shell. The movable portion closes the exhaust hole 21 in the undeformed state. When the gas blows the movable portion, the movable portion can be deformed and bent to expose the exhaust hole 21, thereby achieving exhaust. The movable portion here is two independent sub-movable portions 32, that is, the deformation of the two sub-movable portions 32 is independent of each other. Such a design can make the sub-movable portion 32 relatively small in size, easier to deform, and can be opened when blown by a small airflow, greatly improving the exhaust effect. This exhaust effect can be specifically reflected in the following aspects: First, when the airflow is small, the deformation of the seed movable part 32 will be easier than the prior art (a single movable part), and a better exhaust effect can be achieved even when the airflow is small. Second, when the airflow is large, the deformation speed of the seed movable part 32 is faster than that of the prior art (a single movable part), and the exhaust hole 21 can be quickly exposed to exhaust quickly. Third, since the airflow is uniform under ideal conditions, but often uneven in reality, the deformation of each sub-movable part 32 is independent of each other, which makes it easier to cope with uneven airflow (a single movable part in the prior art is difficult to adapt to uneven airflow, and the exhaust effect is very unsatisfactory), and has a better exhaust effect.

[0050] Here, there are many ways to install the fixing plate 20:

[0051] like Figure 3-4 As shown in Figure 6, as one of the implementation modes, the fixing plate 20 is integrally formed with the upper cover 2.

[0052] like Figure 7 As shown, as another embodiment, the fixing plate 20 is an independent component, which is plugged into the base 1 and the upper cover 2. Of course, as a variant of this embodiment, the fixing plate 20 can also be plugged into the base 1 or the upper cover 2 separately.

[0053] like Figure 8 As shown, as another embodiment, the fixing plate 20 and the arc extinguishing chamber 12 are an integral part, that is, the fixing plate 20 is clamped on the two mounting plates 12 a of the arc extinguishing chamber 12 .

[0054] Here, the shapes of the exhaust holes 21 on the fixing plate 20 are various, and the shapes of the exhaust holes 21 can be regular shapes, such as regular shapes of circles, triangles, rectangles, quadrilaterals, etc. The shapes of the exhaust holes 21 can also be irregular shapes, such as a composite shape of a circle and a triangle, a composite shape of a triangle and a rectangle, a composite shape of a quadrilateral and a circle, etc. Of course, the irregular shapes here are not limited to the composite of regular shapes, and here are just examples of the composite of some regular shapes for ease of understanding. The irregular shapes here include any irregular shapes as long as they can be used for exhaust.

[0055] Here, there are many ways to install the movable piece 30:

[0056] The movable piece 30 can be inserted on the base 1 through the fixing part 31 , or can be inserted on the upper cover 2 through the fixing part 31 . It is only necessary to open a slot for inserting the fixing part 31 on the base 1 or the upper cover 2 .

[0057] Here, the movable piece 30 has many deformation directions:

[0058] like Fig.10 As shown, as one of the embodiments, the sub-movable part 32 has a movable end 32a and a connecting end 32b, the connecting end 32b is connected to the fixed part 31, and the movable end 32a is arranged away from the fixed part 31. Here, the movable end 32a is arranged adjacent to the base 1. When the gas blows the sub-movable part 32 to deform, the movable end 32a moves in a direction away from the base 1.

[0059] like Fig. 9 As shown, as one of the embodiments, the sub-movable part 32 has a movable end 32a and a connecting end 32b, the connecting end 32b is connected to the fixed part 31, and the movable end 32a is arranged away from the fixed part 31. Here, the movable end 32a is arranged adjacent to the upper cover 2. When the gas blows the sub-movable part 32 to deform, the movable end 32a moves in the direction away from the upper cover 2.

[0060] Here, there are many forms in which the movable sheet 30 closes the exhaust hole 21:

[0061] like Fig.11As shown, each sub-movable part 32 covers at least one exhaust hole 21. In this embodiment, each sub-movable part 32 closes two long exhaust holes 21, and these exhaust holes 21 do not exceed the outer edge of the corresponding sub-movable part 32, and a gap is formed between the outer edges of the two sub-movable parts 32. The core idea of ​​this embodiment is that each sub-movable part 32 closes at least one exhaust hole 21, and the exhaust hole 21 does not exceed the edge of the sub-movable part 32, so the number and shape of the exhaust holes 21 are not limited, and can be any number or any shape.

[0062] like Fig.12 As shown, there is only one exhaust hole 21 , and two sub-movable parts 32 cover the exhaust hole 21 together.

[0063] like Fig.13 As shown, the number of the exhaust holes 21 is at least two. In this embodiment, the number of the exhaust holes 21 is five long strip exhaust holes 21, and each sub-movable part 32 closes two and a half exhaust holes 21, that is, one exhaust hole 21 is closed by two connected sub-movable parts 32. The core idea of ​​this embodiment is that at least one exhaust hole 21 is closed by two sub-movable parts 32, so the number and shape of the exhaust holes 21 are not limited as long as the core idea is met.

[0064] Here, the specific shapes of the movable piece 30 are many:

[0065] like Figure 5 As shown, in some embodiments of the present application, the movable sheet 30 is similar to a convex structure, and the fixed portion 31 of the movable sheet 30 includes a base 31a and two side portions 31b, the two side portions 31b are connected to the base 31a, and a gap is formed between the two side portions 31b. The two sub-movable portions 32 are connected to the base 31a and are in the gap. The heights of the two side portions 31b here are shorter than those of the sub-movable portions 32, so the overall shape is similar to a convex structure. Here, there is a gap between the sub-movable portion 32 and the side portions 31b, which is conducive to deformation.

[0066] like Fig.14 As shown, in some embodiments of the present application, the fixed portion 31 of the movable sheet 30 includes a base 31a and a first side portion 31c, a second side portion 31d, and a third side portion 31e, and the base 31a is connected to the first side portion 31c, the second side portion 31d, and the third side portion 31e to form a frame structure. The two sub-movable portions 32 are connected to the base 31a and are located in the frame structure, which is equivalent to filling the hollow part of the frame structure. At the same time, there are gaps between the sub-movable portions 32 and the first side portion 31c, the second side portion 31d, and the third side portion 31e, which is conducive to deformation.

[0067] As a preferred embodiment, the exhaust hole 21 is provided so as not to exceed the connection L between the movable part and the fixed part 31 .

[0068] like Fig.15 As shown, the number of the exhaust holes 21 is five groups, each group has two (closed by two sub-movable parts 32 respectively), and the five groups of exhaust holes 21 are arranged along the height direction of the movable sheet 30, and all the exhaust holes 21 are arranged within the connection L between the movable part and the fixed part 31, and one group of exhaust holes 21 is arranged next to the connection L between the movable part and the fixed part 31. In this embodiment, the core idea is that multiple groups of exhaust holes 21 arranged side by side are arranged within the connection L between the movable part and the fixed part 31, and the number of groups of exhaust holes 21 here only needs to meet the requirement of at least two groups, and there is no requirement for the number in each group, as long as the exhaust effect can be met.

[0069] like Fig.16 As shown, the exhaust hole 21 is in the shape of an elongated strip, and the number of the exhaust holes 21 is five. The length direction of the exhaust hole 21 is consistent with the height direction of the movable sheet 30. Here, each hole wall of the exhaust hole 21 does not exceed the connection L between the movable part and the fixed part 31, and one of the hole walls of the exhaust hole 21 is arranged next to the connection L between the movable part and the fixed part 31. In this embodiment, the core idea is that when the exhaust hole 21 is in the shape of an elongated strip, the hole wall of the exhaust hole 21 is arranged beyond the connection L between the movable part and the fixed part 31, so there is no requirement for the number of the exhaust holes 21, as long as the exhaust effect can be met.

[0070] There are many choices of materials for the movable piece 30, such as phenolic paperboard, Nomix paper, etc.

[0071] Although the above structure is an example of two sub-movable parts 32, it can also be applied to three sub-movable parts 32, four sub-movable parts 32, or even more sub-movable parts 32. And although a three-pole circuit breaker is used as an example, it is not limited to a three-pole circuit breaker, and can also be applied to a two-pole or four-pole circuit breaker, and the number of the corresponding arc extinguishing chamber 12, arc extinguishing chamber slot 11, and exhaust device can be changed accordingly.

[0072] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without contradiction.

[0073] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An exhaust device for a circuit breaker, comprising a housing, an arc extinguishing chamber, a fixed sheet and a movable sheet; the arc extinguishing chamber is arranged inside the housing, the fixed sheet is located at the rear of the arc extinguishing chamber, an exhaust hole is arranged on the fixed sheet, and the exhaust hole is used for exhaust; the movable sheet is located on a surface of the fixed sheet away from the arc extinguishing chamber, the movable sheet comprises a connected fixed part and a movable part, the fixed part is arranged on the housing, the movable part closes the exhaust hole in an undeformed state, and the movable part is deformed when blown by gas to expose the exhaust hole so as to facilitate the exhaust of gas in the circuit breaker; characterized in that: The movable part is at least two sub-movable parts arranged side by side, and the deformation of each sub-movable part is independent of each other.

2. The exhaust device of a circuit breaker according to claim 1, characterized in that: The shell includes a base and an upper cover, and the fixing plate is inserted into the base and / or the upper cover; or, the shell includes a base and an upper cover, and the fixing plate and the upper cover are integrally formed; or, the shell includes a base and an upper cover, and the fixing plate and the arc extinguishing chamber are integral.

3. The exhaust device of a circuit breaker according to claim 1, characterized in that: The shell includes a base and an upper cover, and the fixed part is inserted into the base and / or the upper cover; the sub-movable part has a movable end and a connecting end, the connecting end is connected to the fixed part, and the movable end is arranged away from the fixed part; when the sub-movable part is in an undeformed state, the movable end is arranged adjacent to the base or the upper cover.

4. The exhaust device of a circuit breaker according to claim 1, characterized in that: Each sub-movable part covers at least one exhaust hole, and the covered exhaust hole does not exceed the outer edge of the corresponding sub-movable part; a gap is formed between the outer edges of two adjacent sub-movable parts.

5. The exhaust device of a circuit breaker according to claim 1, characterized in that: The number of the exhaust holes is at least two groups, each group of exhaust holes is arranged along the height direction of the movable sheet, each group of exhaust holes is arranged within the connection between the movable part and the fixed part, and one group of exhaust holes is arranged next to the connection between the movable part and the fixed part; or, the exhaust holes are long strips, the length direction of the exhaust holes is consistent with the height direction of the movable sheet, each hole wall of the exhaust holes does not exceed the connection between the movable part and the fixed part, and one of the hole walls of the exhaust holes is arranged next to the connection between the movable part and the fixed part.

6. The exhaust device of a circuit breaker according to claim 1, characterized in that: The fixed part includes a base and two side parts, the two side parts are connected to the base, a gap is formed between the two side parts, all the sub-movable parts are connected to the base and are in the gap, and the heights of the two side parts are not higher than any sub-movable part; or, the fixed part includes a base and a first side part, a second side part, and a third side part, the base is connected to the first side part, the second side part, and the third side part to form a frame structure, and all the sub-movable parts are connected to the base and are in the frame structure.

7. The exhaust device of a circuit breaker according to claim 1, characterized in that: The cross-sectional shape of the exhaust hole is a regular pattern or an irregular pattern; or, the number of the exhaust hole is one, and all the sub-movable parts jointly close the exhaust hole; or, the number of the exhaust holes is at least two, and at least one exhaust hole is closed by two adjacent sub-movable parts; or, the movable sheet is phenolic paperboard or Nomix paper.

8. The exhaust device of a circuit breaker according to claim 1, characterized in that: The shell includes a base and an upper cover, wherein an arc extinguishing chamber groove is arranged on the base, wherein the arc extinguishing chamber is arranged in the arc extinguishing chamber groove and the top of the arc extinguishing chamber is arranged beyond the arc extinguishing chamber groove; and further includes an arc extinguishing chamber cover, wherein the arc extinguishing chamber cover is arranged at the top of the arc extinguishing chamber; and the arc extinguishing chamber cover is fixed to the base or the upper cover.

9. The exhaust device of a circuit breaker according to claim 8, characterized in that: The arc extinguishing chamber cover is fixed to the base or the upper cover by one or more of screw fastening, clamping fixation, and tight fit.

10. The exhaust device of a circuit breaker according to claim 8, characterized in that: There are at least two arc extinguishing chamber slots, the number of arc extinguishing chambers corresponds to the number of arc extinguishing chamber slots, and the arc extinguishing chamber cover is arranged on the top of all arc extinguishing chambers; the arc extinguishing chamber cover is provided with an avoidance groove, and the avoidance groove is used to avoid the handle of the circuit breaker.

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