Circuit breaker arc extinguish chamber

Abstract

An arc extinguish chamber of a circuit breaker belongs to the technical field of direct-current switch equipment. Comprising a plurality of grid sheets, a pair of side plates and a pore plate, the grid sheets are arranged between the pair of side plates in an array mode, the pore plate is located on one side of an air outlet of the grid sheets, a plurality of vent hole arrangement strips extending in the width direction are arranged on the pore plate, and the grid plate is characterized in that protrusions are arranged in each vent hole arrangement strip and embedded into gaps between the adjacent grid sheets. The device has the advantages that the positioning effect of the grid plate can be greatly improved; the arrangement of the vent holes in the pore plate is not affected, and the ventilation effect of the pore plate is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of switchgear, and particularly relates to an arc extinguishing chamber of a circuit breaker. Background Art

[0002] Researching how to quickly extinguish arcs and improve the breaking capacity of DC switchgear is of great significance and can bring many positive impacts to the design and development of DC switchgear. Since there is no natural zero-crossing point for DC current, the difficulty of DC switchgear in interrupting DC current is significantly greater than that in interrupting AC current, especially in interrupting high-voltage DC current. In the prior art, large-sized air circuit breakers usually adopt a multi-contact structure, and there are multiple main contacts and arc contacts. The main contacts are used to carry current, and the arc contacts are used to carry current and also for current interruption while carrying current. Among them, the arc contacts extend into the narrow slots of the arc extinguishing assembly for interrupting the loop current. When the narrow slots are too wide, the arc extinguishing system may be difficult to interrupt due to its weak driving ability for small currents; if the narrow slots are narrowed, it is beneficial for small current interruption, but when interrupting a large short-circuit current, arcing may also occur on the main contacts, and the arc on the main contacts may be difficult to enter the narrow slots, which may lead to unreliable interruption.

[0003] As the core component of the circuit breaker, the arc extinguishing system's cutting and extinguishing of arcs will directly affect the breaking capacity and its own service life and other characteristics of the switchgear. When the arc enters the grid plates, it will impact the grid plates. Therefore, the structural reliability of the grid plates in the arc extinguishing chamber is particularly important. In view of the above-existing technology, the applicant has made a beneficial design and improved the installation and positioning of the grid plates. The technical solution to be introduced below is generated under this background. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an arc extinguishing chamber of a circuit breaker, which can improve the installation stability of the grid plates and ensure good ventilation effect.

[0005] The purpose of the utility model is achieved as follows: an arc extinguishing chamber of a circuit breaker includes several grid plates, a pair of side plates, and a hole plate. The several grid plates are arranged in an array between the pair of side plates. The hole plate is located on the air outlet side of the grid plates. The hole plate has multiple ventilation hole arrangement strips corresponding to the gaps between adjacent grid plates. There are protrusions in the ventilation hole arrangement strips, and the protrusions are embedded into the gaps between adjacent grid plates.

[0006] In a specific embodiment of the utility model, there are at least two spaced protrusions in each ventilation hole arrangement strip.

[0007] In another specific embodiment of the utility model, it further includes an arc extinguishing cover. The arc extinguishing cover further includes a cover body and a deionization component. The deionization component is located between the hole plate and the cover body.

[0008] In yet another specific embodiment of the present utility model, in the width direction of the orifice plate, the ventilation holes are located between and on both sides of the protrusions.

[0009] In still another specific embodiment of the present utility model, the protrusions are evenly distributed in the width direction of the orifice plate.

[0010] In still another specific embodiment of the present utility model, the height of the protrusion is greater than one times the thickness of the orifice plate and less than three times the thickness of the orifice plate.

[0011] In yet another specific embodiment of the present utility model, in the length direction of the orifice plate, adjacent protrusions are staggered from each other.

[0012] In yet another specific embodiment of the present utility model, the extended end of the protrusion is smaller than the bottom of the protrusion.

[0013] In yet another specific embodiment of the present utility model, the cross-section of the protrusion is trapezoidal.

[0014] In yet another specific embodiment of the present utility model, the orifice plate is provided with flanges that are folded towards the cover body on both sides corresponding to a pair of side plates, and the flanges are used for installation and cooperation with the deionization component.

[0015] Due to the adoption of the above structure, the present utility model has the following beneficial effects compared with the prior art: An orifice plate is provided on the air outlet side of the grid sheet, the orifice plate extends protrusions towards the grid sheet, and the protrusions are embedded between adjacent grid sheets, thereby greatly improving the positioning effect of the grid sheet; the setting of the protrusions consumes less materials and does not affect the setting of the ventilation holes on the orifice plate, ensuring the ventilation effect of the orifice plate and greatly improving the structural stability of the grid sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is an exploded schematic view of the first embodiment of the present utility model;

[0017] Figure 2 is a perspective view of the first embodiment of the present utility model;

[0018] Figure 3 is an internal cross-sectional view of the first embodiment of the present utility model;

[0019] Figure 4 is a structural schematic view of the moving contact in the first embodiment of the present utility model;

[0020] Figure 5 is a structural schematic view of the covering member in the first embodiment of the present utility model;

[0021] Figure 6Schematic diagram of the orifice plate in the first embodiment of the present utility model;

[0022] Figure 7 Schematic diagram of the moving contact in the second embodiment of the present utility model;

[0023] Figure 8 Stereogram of the second embodiment of the present utility model;

[0024] Figure 9 Internal sectional view of the second embodiment of the present utility model.

[0025] In the figure: 1. Contact system, 11. Moving contact, 111. Short contact piece, 1111. Moving contact point, 112. First long contact piece, 1121. First arc contact point, 113. Second long contact piece, 1131. Second arc contact point, 12. Static contact, 121. Static contact point, 122. First arc guiding piece, 1221. Static arc contact point, 123. Second arc guiding piece, 1231. Mounting part, 1232. Connecting part, 1233. Head; 2. Arc extinguishing chamber, 21. Grid piece, 211. Notch, 2111. First notch, 2112. Second notch, 212. Grid piece leg, 213. Main grid piece, 214. End grid piece, 22. Side plate, 221. Gas generating plate, 23. Spacer plate, 231. Second fin, 24. Arc extinguishing cover, 241. Orifice plate, 2411. Vent hole, 2412. Protrusion, 2413. Flanging, 242. Cover body, 25. Coating part, 251. First fin, 252. First opposite surface, 253. Second opposite surface, 254. Contact part; 100. First narrow slit, 200. Second narrow slit, 300. Flared opening. Detailed implementation manners

[0026] The following describes in detail the specific implementation manners of the present utility model in conjunction with the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solutions. Any change in form rather than in essence based on the concept of the present utility model should be regarded as the protection scope of the present utility model.

[0027] In the following description, any concepts related to the directionality (or orientation) such as up, down, left, right, front and back are in the context of the position state of the figure being described, aiming to facilitate public understanding. Therefore, it should not be construed as a special limitation on the technical solutions provided by the present utility model.

[0028] Embodiment 1: Figures 1 to 4 Schematic diagram of the first embodiment of the present utility model. Inside the circuit breaker, there are a contact system 1, an arc extinguishing chamber 2, an operating mechanism (not shown in the figure), etc. The operating mechanism is the energy component of the circuit breaker. When the circuit breaker performs closing and opening operations, the contact system 1 is driven by the operating mechanism to close or open. When an arc is generated on the contact system 1, the arc enters the arc extinguishing chamber 2 and is extinguished.

[0029] The contact arc extinguishing device is composed of the contact system 1 and the arc extinguishing chamber 2 as described above. The contact system 1 includes a moving contact 11 and a static contact 12. The moving contact 11 is a swinging component, while the static contact 12 is fixedly arranged. That is, the moving contact 11 realizes contact or separation with the static contact 12 through its own swinging.

[0030] The moving contact 11 includes a short contact piece 111 and a first long contact piece 112. The short contact piece 111 and the first long contact piece 112 are arranged side by side. There is a moving contact point 1111 on the short contact piece 111. There is a first arc contact point 1121 on the first long contact piece 112. When the short contact piece 111 and the first long contact piece 112 are installed, the head of the first long contact piece 112 has a greater extension length relative to the head of the short contact piece 111. The first arc contact point 1121 is located above the moving contact point 1111 in the extending direction of the contact piece. For the moving contact 11, except for the first long contact piece 112, the other contact pieces are the remaining contact pieces of the moving contact 11. In order to ensure that the arc is generated on the first long contact piece 112, the separation of the first long contact piece 112 from the static contact 12 is the latest.

[0031] The static contact 12 includes a conductive block and a static contact point 121 fixedly arranged on the conductive block. The static contact point 121 is used for contact and cooperation with the moving contact point 1111 on the short contact piece 111. An arc guiding piece group is also arranged on the conductive block. The arc guiding piece group is fixed on the conductive block and is located on the side of the static contact point 121 facing the arc extinguishing chamber 2. Specifically for the arc guiding piece group, the arc guiding piece group includes a first arc guiding piece 122 and a second arc guiding piece 123. The first arc guiding piece 122 and the second arc guiding piece 123 are arranged side by side.

[0032] The arc extinguishing chamber 2 described above includes grid plates 21, side plates 22, spacer plates 23 and an arc extinguishing cover 24. A plurality of grid plates 21 are arrayed between the pair of side plates 22. Preferably, the grid plates 21 are installed between the pair of side plates 22 by riveting. The spacer plate 23 is located inside the cavity of the arc extinguishing chamber 2 and divides the cavity of the arc extinguishing chamber 2 into at least two arc channels. The arc channels include at least one first arc channel and one second arc channel. The first long contact piece 112 extends into the first arc channel, and the remaining contact pieces on the moving contact 11 correspond to the second arc channel. The diameter of the first arc channel is smaller than that of the second arc channel. The above diameter can also be referred to as width, that is, the width of the first arc channel is smaller than the width of the second arc channel. The arc extinguishing cover 24 is located on the gas outlet side of the grid plates 21. Specifically, the spacer plate 23 and a nearby side plate 22 form a first arc channel, and the spacer plate 23 and a far side plate 22 form a second arc channel. Of course, the first arc channel and the second arc channel are not limited to being formed by the spacer plate 23 and the side plate 22. It can also be that: the spacer plate 23 is composed of multiple pieces, and the first arc channel or / and the second arc channel are formed by multiple spacer plates 23.

[0033] The first arcing piece 122 corresponds to the first arc channel, and the second arcing piece 123 corresponds to the second arc channel. Preferably, the first arcing piece 122 is in a straight strip shape, which helps the arc to enter the grid plates 21 along the first arc channel. The second arcing piece 123 includes a mounting portion 1231, a connecting portion 1232 and a head portion 1233. The connecting portion 1232 connects the mounting portion 1231 and the head portion 1233. The mounting portion 1231 is fixed on the conductive block, and the head portion 1233 is located at one end of the arrayed grid plates 21. More preferably, the mounting portion 1231 is trapezoidal, the connecting portion 1232 is an arched and elongated strip shape, and the head portion 1233 is in a rectangular shape with a missing corner.

[0034] Under the above structure, the first arc contact point 1121 on the first long contact piece 112 is in contact and cooperation with the arc ignition piece group. In this embodiment, the first arc contact point 1121 is in contact and cooperation with the first arc ignition piece 122. During the closing process of the contact system 1, the contact between the first arc contact point 1121 and the first arc ignition piece 122 precedes the contact between the moving contact point 1111 and the static contact point 121. And when the contact system 1 separates, the separation between the first arc contact point 1121 and the first arc ignition piece 122 is later than the separation between the moving contact point 1111 and the static contact point 121, so as to ensure that the arc is generated on the first arc contact point 1121 and the first arc ignition piece 122. Preferably, a static arc contact point 1221 is provided on the first arc ignition piece 122, and the first arc contact point 1121 is in contact and cooperation with the static arc contact point 1221.

[0035] The grid piece 21 includes a base portion, and a notch 211 is provided on one side of the base portion facing the contact system 1. Each notch 211 corresponds to an arc channel. The grid piece 21 also has at least one grid piece leg 212, and the grid piece leg 212 is located on one side of at least one notch 211. In this embodiment, there are two notches 211, including a first notch 2111 and a second notch 2112. The first notch 2111 corresponds to the first arc channel, and the second notch 2112 corresponds to the second arc channel. Since the width of the first arc channel is smaller than the width of the second arc channel, correspondingly, the first notch 2111 is smaller than the second notch 2112.

[0036] In this embodiment, grid piece legs 212 are provided on both sides of the second notch 2112. The first notch 2111 is located on one side of a side plate 22. Therefore, there is no grid piece leg 212 on the side of the first notch 2111 close to the side plate 22, and the other side of the first notch 2111 shares a grid piece leg 212 with the second notch 2112. Specifically, both the first notch 2111 and the second notch 2112 are triangular, preferably acute-angle notches.

[0037] In this embodiment, the grid piece 21 includes a main grid piece 213 and an end grid piece 214. There are multiple main grid pieces 213 and multiple end grid pieces 214. Multiple main grid pieces 213 are arrayed together to form a group. Similarly, multiple end grid pieces 214 are arrayed together to form a group. A group of end grid pieces 214 is located on the side of a group of main grid pieces 213 away from the static contact 12. The difference between the end grid piece 214 and the main grid piece 213 is that: the grid piece leg 212 of the end grid piece 214 is shorter than the grid piece leg 212 of the main grid piece 213.

[0038] The first arc channel formed by the spacer 23 and the adjacent side plate 22 constitutes the first narrow slit 100. Preferably, in order to facilitate gas generation, a gas generation plate 221 is attached to the side plate 22, and the spacer 23 can be made of a gas generation material or have a gas generation sheet attached to its side. At least one first long contact piece 112 extends into this first arc channel. Specifically, the first long contact piece 112 extends into the first narrow slit 100. Preferably, the head of the first long contact piece 112 extends past the extended end of the grid piece leg 212. Specifically, the head of the first long contact piece 112 extends past the extended end of the grid piece leg 212 of the main grid piece 213. In this embodiment, only one first long contact piece 112 extends into the first arc channel.

[0039] The arc extinguishing chamber 2 further includes a pair of covering members 25. The left covering member 25 is fitted and installed with the spacer 23 and covers the grid piece legs 212 on the left side of the grid piece 21; while the right covering member 25 and the right side plate 22 cover the grid piece legs 212 on the right side of the grid piece 21.

[0040] See Figure 5 , generally, the covering members 25 are made of a gas generation material. First fins 251 extend from the covering members 25, and the first fins 251 are inserted into the adjacent grid piece legs 212. For the left covering member 25, since the spacer 23 also has second fins 231 extending towards the grid piece legs 212, the second fins 231 are also embedded into the adjacent grid piece legs 212. Specifically, in the extending direction of the grid piece legs 212, the first fins 251 and the second fins 231 are in an adjacent relationship on the front and rear sides in the extending direction of the grid piece legs 212.

[0041] In this embodiment, the moving contact 11 further includes a second long contact piece 113. The short contact piece 111 is located outside the arc extinguishing chamber 2, and the first long contact piece 112 and the second long contact piece 113 extend into the interior of the arc extinguishing chamber 2. The second long contact piece 113 also has a second arc contact point 1131. For the second arc channel, the second long contact piece 113 extends into the second arc channel. Specifically, the first long contact piece 112 and the second long contact piece 113 have the same extending length.

[0042] During the closing process of the contact system 1, the contact between the second arc contact 1131 of the second long contact piece 113 and the second arc guiding piece 123 of the static contact 12 precedes the contact between the moving contact 1111 of the short contact piece 111 and the static contact 121 of the static contact 12. When the contact system 1 separates, the separation between the second arc contact 1131 and the second arc guiding piece 123 is later than the separation between the moving contact 1111 and the static contact 121.

[0043] To ensure that the arc is preferentially generated on the first arc contact 1121 of the first long contact piece 112 and the first arc guiding piece 122. During the closing process of the contact system 1, the contact between the first arc contact 1121 and the first arc guiding piece 122 precedes the contact between the second arc contact 1131 and the second arc guiding piece 123. When the contact system 1 separates, the separation between the first arc contact 1121 and the first arc guiding piece 122 is later than the separation between the second arc contact 1131 and the second arc guiding piece 123, thereby ensuring that the arc is generated on the first arc contact 1121 and the first arc guiding piece 122. That is, during the closing process of the contact system 1, the order from first to last is: the contact between the first arc contact 1121 and the first arc guiding piece 122, the contact between the second arc contact 1131 and the second arc guiding piece 123, and the contact between the moving contact 1111 and the static contact 121. The separation process of the contact system 1 is opposite to the above order and will not be repeated.

[0044] To ensure the above contact or separation sequence relationship, usually, the contact part between the contact support of the contact system 1 and the contact piece can be adjusted. When the moving contact 11 and the static contact 12 are in a separated state, the contact pieces have a certain angular difference.

[0045] See Figure 5 And in combination with Figure 2 、 Figure 3 After a pair of covering parts 25 are installed in place, they face each other. On the opposite sides of the covering parts 25, there are a first opposite surface 252 and a second opposite surface 253. A pair of first opposite surfaces 252 form a second narrow slit 200, while a pair of second opposite surfaces 253 form a flared opening 300 that expands towards the moving contact system 1 side. The flared end of the flared opening 300 corresponds to the short contact piece 111, and the narrowed end of the flared opening 300 corresponds to the second narrow slit 200. The second long contact piece 113 extends into the flared opening 300 and is located outside the second narrow slit 200. The second long contact piece 113 and the short contact piece 111 both correspond to the flared opening 300. That is to say, the arcs generated on the second long contact piece 113 and the short contact piece 111 enter the upper second narrow slit 200 through the flared opening 300. There are also contact parts 254 on the covering parts 25. A pair of contact parts 254 are in contact and cooperate with the installation of the moving arc guiding piece of the arc extinguishing chamber 2.

[0046] SeeFigure 6 in combination with Figure 1 and Figure 2 The arc extinguishing cover 24 is also fixedly installed between a pair of side plates 22 and is located at the top of the arc extinguishing chamber 2. The arc extinguishing cover 24 includes an orifice plate 241, a cover body 242, and a deionization component (not shown in the figure). The deionization component is located above the orifice plate 241. More specifically, the orifice plate 241 and the deionization component are both accommodated inside the cover body 242. The orifice plate 241 is in contact with the air outlet side of the grid plates 21.

[0047] The orifice plate 241 is provided with uniformly arranged ventilation holes 2411 and protrusions 2412. The protrusions 2412 extend downward from the lower side surface of the orifice plate 241 and cooperate with the grid plates 21. Specifically, the protrusions 2412 are snapped into the gaps between adjacent grid plates 21 to position the grid plates 21 and ensure the stability of the installation of the grid plates 21. The protrusions 2412 are disposed between adjacent ventilation holes 2411 in the width direction of the orifice plate 241 and do not affect the arrangement of the ventilation holes 2411, that is, do not reduce the ventilation volume of all the ventilation holes 2411 on the orifice plate 241.

[0048] Specifically, the orifice plate 241 is provided with a plurality of rows of ventilation holes 2411 corresponding to the gaps between adjacent grid plates 21, and the protrusions 2412 are provided in the rows of ventilation holes 2411. The protrusions 2412 are embedded into the gaps between adjacent grid plates 21. In the above description, the ventilation holes 2411 do not necessarily need to be located within the gaps between the grid plates 21, and part of the ventilation holes 2411 may also be located within the gaps between the grid plates 21. Preferably, there are at least two protrusions 2412, and the protrusions 2412 are uniformly distributed in the width direction of the orifice plate 241. The protrusions 2412 are arranged at intervals, and a plurality of ventilation holes 2411 are located between and on both sides of each protrusion 2412.

[0049] Furthermore, the protruding height of the protrusions 2412 is greater than one times the thickness of the orifice plate 241 and less than three times the thickness of the orifice plate 241. Preferably, the protruding height of the protrusions 2412 is two times the thickness of the orifice plate 241. In the length direction of the orifice plate 241, adjacent protrusions 2412 are staggered from each other.

[0050] More preferably, in order to facilitate the embedding of the protrusions 2412 into adjacent grid plates 21, the protrusions 2412 are conical protrusions, that is, the extending ends of the protrusions 2412 are smaller than the bottoms of the protrusions 2412. The protrusions 2412 can also be trapezoidal protrusions. Of course, they can also be protrusions of other shapes such as triangular. The protrusions 2412 position the air outlet side of the grid plates 21, so that the grid plates 21 have a better installation and fixing effect.

[0051] Further, above the orifice plate 241, i.e., on the side facing the arc extinguishing cover 24 and corresponding to both sides of a pair of side plates 22, upward flanges 2413 are provided. The flanges 2413 are used for mounting and cooperating with the deionization component, facilitating the orifice plate 241 to carry the deionization component and be received together into the inner cavity of the cover body 242.

[0052] Continue to see Figure 3 , in the present utility model, since a first narrow slit 100 is provided on one side of the arc extinguishing chamber 2, the first long contact piece 112 extends into the first narrow slit 100, and during the separation process of the moving contact 11 and the static contact 12, the separation of the first long contact piece 112 from the first arc guiding piece 122 is the latest compared to the separation of the second long contact piece 113 from the second arc guiding piece 123 and the separation of the short contact piece 111 from the static contact 12. Therefore, the arc first appears on the first long contact piece 112, and after passing through the first narrow slit 100, the arc enters the grid sheets 21 and extinguishes. For small currents, the small current only passes through the first narrow slit 100 and then enters the grid sheets 21 to extinguish, but for large currents, in addition to generating an arc on the first long contact piece 112, an arc will also be generated on the second long contact piece 113. The arc generated on the second long contact piece 113 passes through the flared opening 300 and then enters the grid sheets 21 through the second narrow slit 200.

[0053] The caliber d1 of the first narrow slit 100 is smaller than the caliber d2 of the second narrow slit 200. Since the first narrow slit 100 corresponds to the first long contact piece 112, and the second narrow slit 200 corresponds to the second long contact piece 113 and the short contact piece 111, and the second narrow slit 200 corresponds to more contact pieces compared to the first narrow slit 100, therefore, the caliber of the second narrow slit 200 being larger than that of the first narrow slit 100 can better meet the requirements of large currents.

[0054] Further, see Figure 3 , the flared opening 300 forms an included angle A, and the included angle A better corresponds to the second long contact piece 113 and the short contact piece 111.

[0055] The first notch 2111 and the second notch 2112 respectively correspond to the first narrow slit 100 and the second narrow slit 200. Since the caliber of the second narrow slit 200 is larger than that of the first narrow slit 100, therefore, the opening of the second notch 2112 is larger than the opening of the first notch 2111.

[0056] This structure can fully take into account the situation of small current breaking while being suitable for large current breaking.

[0057] Embodiment 2: As Figures 7 to 9 is a schematic diagram of the second embodiment.

[0058] The difference between the second embodiment and the first embodiment lies in that: the moving contact 11 includes a first long contact piece 112 and a short contact piece 111, and does not include the second long contact piece 113. Among them, the first long contact piece 112 corresponds to the first narrow slit 100; while the short contact pieces 111 are arrayed together and correspond to the flared opening 300. The second narrow slit 200 is located above the flared opening 300. The first long contact piece 112 extends into the first narrow slit 100, while the short contact pieces 111 are located outside the flared opening 300, that is, the short contact pieces 111 are located outside the arc extinguishing chamber 2.

[0059] In the first embodiment and the second embodiment, since only one first long contact piece 112 extends into the first narrow slit 100, in order to increase the service life of the first long contact piece 112, the width of the first long contact piece 112 can be wider than that of other contact pieces. Of course, the first arc contact point 1121 also follows suit and becomes wider.

[0060] Embodiment 3: The remaining contact pieces of the moving contact 11 further include a second long contact piece 113, that is, the moving contact 11 includes a first long contact piece 112 and a second long contact piece 113. The first arc channel forms the first narrow slit 100, and the second arc channel forms the second narrow slit 200. The first long contact piece 112 extends into the first narrow slit 100, and the second long contact piece 113 extends into the second narrow slit 200. The diameter of the first narrow slit 100 is smaller than that of the second narrow slit 200. When the current is small, an arc is generated on the first long contact piece 112 and enters the grid sheet 21 through the first narrow slit 100 to be extinguished. When the current is large, an arc is also generated on the second long contact piece 113 and enters the grid sheet 21 through the second narrow slit 200 to be extinguished. At this time, the requirements for interrupting both small and large currents are taken into account.

[0061] Due to the adoption of the above structure, the beneficial effects of the present utility model compared with the prior art are as follows: the partition plate 23 divides the inner cavity of the arc extinguishing chamber 2 into at least two arc channels. The arc channels include at least one first arc channel and one second arc channel. The first long contact piece 112 extends into the first arc channel, and the remaining contact pieces on the moving contact 11 correspond to the second arc channel. The diameter of the first arc channel is smaller than that of the second arc channel. The first arc channel is used to handle the interruption of small currents, and the second arc channel is used to handle large currents. It can fully take into account the interruption of small currents in the case suitable for interrupting large currents, so as to meet the developing interruption requirements.

Claims

1. A circuit breaker arc extinguishing chamber, comprising a plurality of grid plates (21), a pair of side plates (22) and a perforated plate (241), wherein the plurality of grid plates (21) are arrayed between the pair of side plates (22), the perforated plate (241) is located at one side of an air outlet of the grid plates (21), and the perforated plate (241) has a plurality of vent holes (2411) arranged corresponding to gaps between adjacent grid plates (21), characterized in that: There is a protrusion (2412) in the ventilation hole (2411) arrangement strip, and the protrusion (2412) is embedded in the gap between adjacent grid plates (21).

2. The circuit breaker arc extinguishing chamber according to claim 1, characterized in that: Each vent hole (2411) arrangement strip has at least two protrusions (2412) disposed at intervals.

3. The circuit breaker arc extinguishing chamber according to claim 1, characterized in that: It also includes an arc extinguishing cover (24), and the arc extinguishing cover (24) also includes a cover body (242) and an anti-ionization component, and the anti-ionization component is located between the orifice plate (241) and the cover body (242).

4. The circuit breaker arc extinguishing chamber according to claim 2, characterized in that: In the width direction of the orifice plate (241), the vent holes (2411) are located between and on both sides of the protrusions (2412).

5. The circuit breaker arc extinguishing chamber according to claim 2, characterized in that: The protrusions (2412) are evenly distributed in the width direction of the orifice plate (241).

6. The circuit breaker arc extinguishing chamber according to claim 1, characterized in that: The protrusion height of the protrusion (2412) is greater than one times the thickness of the orifice plate (241) and less than three times the thickness of the orifice plate (241).

7. The circuit breaker arc extinguishing chamber according to claim 1, characterized in that: In the length direction of the orifice plate (241), adjacent protrusions (2412) are staggered with each other.

8. The circuit breaker arc extinguishing chamber according to claim 1, characterized in that: The extended end of the protrusion (2412) is smaller than the bottom of the protrusion (2412).

9. The arc extinguishing chamber of a circuit breaker according to claim 8, characterized in that: The cross section of the protrusion (2412) is trapezoidal.

10. The circuit breaker arc extinguishing chamber according to claim 3, characterized in that: The orifice plate (241) is provided with flanges (2413) folded toward the cover body (242) on both sides corresponding to a pair of side plates (22), and the flanges (2413) are used for installation and cooperation with the de-ionizing component.

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