Contact arc extinguishing device

Abstract

A contact arc extinguishing device belongs to the technical field of switching devices. Comprising a contact system and an arc extinguish chamber, a moving contact of the contact system comprises at least one first long contact piece, and separation of the first long contact piece and a static contact of the contact system is later than separation of other contact pieces on the moving contact and the static contact; the arc extinguish chamber comprises grid sheets, a pair of side plates and a spacing plate, the plurality of grid sheets are arrayed between the pair of side plates, the spacing plate divides an inner cavity of the arc extinguish chamber into at least one first arc channel and one second arc channel, and the arc extinguish chamber is characterized in that the first long contact sheet extends into the first arc channel, and the rest of contact sheets on the moving contact correspond to the second arc channel; the diameter of the first arc channel is smaller than that of the second arc channel. The utility model has the advantages that the first narrow slit is used for dealing with small current breaking, and the second narrow slit is used for dealing with large current, so that the developed breaking requirement is met.

Description

Technical Field

[0001] The utility model belongs to the technical field of switching electrical appliances, and particularly relates to a contact arc extinguishing device. Background Art

[0002] Since there is no natural zero-crossing point for direct current, the difficulty of direct current switching equipment in interrupting direct current is significantly greater than that of interrupting alternating current, especially for interrupting high-voltage direct current. In the prior art, large-sized air circuit breakers usually adopt a multi-contact structure, and there are multiple main contacts and arcing contacts. The main contacts are used to carry current, and the arcing contacts are used for current interruption while carrying current. Specifically, the arcing contacts extend into the narrow slots of the arc extinguishing assembly to interrupt the circuit current. However, when the narrow slots are too wide, it is difficult to interrupt due to the weak driving ability of the arc extinguishing system for small currents. If the narrow slots are narrowed, it is beneficial for small current interruption. However, when interrupting large short-circuit currents, arcing may also occur on the main contacts, and the arc on the main contacts is difficult to enter the narrow slots, which may lead to unreliable interruption.

[0003] In view of the above-mentioned prior art, it is necessary to improve the structure of the existing arc extinguishing device. Therefore, the applicant has made a beneficial design, and 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 a contact arc extinguishing device that can fully consider the interruption of small currents while being suitable for interrupting large currents, ensuring reliable interruption.

[0005] The purpose of the utility model is achieved in this way. A contact arc extinguishing device includes a contact system and an arc extinguishing chamber. The moving contact of the contact system includes at least one first long contact piece, and the separation of the first long contact piece from the static contact of the contact system is later than the separation of the other contact pieces on the moving contact from the static contact; the arc extinguishing chamber includes grid plates, a pair of side plates and a partition plate. A plurality of grid plates are arrayed between the pair of side plates, and the partition plate divides the inner cavity of the arc extinguishing chamber into at least one first arc channel and a second arc channel. The first long contact piece extends into the first arc channel, the other contact pieces on the moving contact correspond to the second arc channel, and the caliber of the first arc channel is smaller than that of the second arc channel.

[0006] In a specific embodiment of the utility model, the other contact pieces of the moving contact further include a second long contact piece. A first narrow slot is formed in the first arc channel, and a second narrow slot is formed in the second arc channel. The second long contact piece extends into the second narrow slot, and the caliber of the first narrow slot is smaller than that of the second narrow slot.

[0007] In another specific embodiment of the present utility model, the remaining contact pieces of the moving contact include short contact pieces; a first narrow slit is formed in the first arc channel, and a second narrow slit and a flare are formed in the second arc channel. The flare end of the flare corresponds to the short contact piece, the narrowing end of the flare corresponds to the second narrow slit, the first long contact piece extends into the first narrow slit, and the caliber of the first narrow slit is smaller than that of the second narrow slit.

[0008] In yet another specific embodiment of the present utility model, the remaining contact pieces of the moving contact include short contact pieces and second long contact pieces; a first narrow slit is formed in the first arc channel, and a second narrow slit and a flare are formed in the second arc channel. The flare end of the flare corresponds to the short contact pieces and the second long contact pieces, the narrowing end of the flare corresponds to the second narrow slit, the first long contact piece extends into the first narrow slit, the short contact piece is located outside the arc extinguishing chamber, the second long contact piece extends into the flare and is located outside the second narrow slit, and the caliber of the first narrow slit is smaller than that of the second narrow slit.

[0009] In still another specific embodiment of the present utility model, a moving contact point is provided on the short contact piece, a first arc contact point is provided on the first long contact piece, and a second arc contact point is also provided on the second long contact piece; the static contact includes a conductive block and a static contact point fixedly provided on the conductive block. The static contact point is in contact and cooperation with the moving contact point. An arc guiding piece group is also fixedly provided on the conductive block, and the arc guiding piece group is located on the side of the static contact point facing the arc extinguishing chamber. The arc guiding piece group includes a first arc guiding piece and a second arc guiding piece. The first arc guiding piece and the second arc guiding piece are arranged side by side. The first arc contact point is in contact and cooperation with the first arc guiding piece, and the second arc contact point is in contact and cooperation with the second arc guiding piece.

[0010] In still another specific embodiment of the present utility model, the first narrow slit is formed by the spacer plate and a side plate.

[0011] In a further specific embodiment of the present utility model, the grid piece includes a base portion, and a notch is provided on the side of the base portion facing the contact system. The grid piece also has at least one grid piece leg. The notch includes a first notch and a second notch. The first notch corresponds to the first narrow slit, and the second notch corresponds to the second narrow slit.

[0012] In an even further specific embodiment of the present utility model, the arc extinguishing chamber further includes a pair of covering members. The grid piece also has two grid piece legs. The left covering member is cooperatively installed with the spacer plate and covers the grid piece leg on the left side of the grid piece; the right covering member is cooperatively installed with the right side plate and covers the grid piece leg on the right side of the grid piece.

[0013] In yet another specific embodiment of the present utility model, one side of the covering member has a first opposite surface and a second opposite surface. The second narrow slit is formed by a pair of first opposite surfaces, and the flared opening is formed by a pair of second opposite surfaces.

[0014] In yet another more specific embodiment of the present utility model, both the first arc channel and the second arc channel are one. The first long contact piece is one, and its thickness is greater than the thickness of the other contact pieces on the moving contact head.

[0015] Due to the adoption of the above structure, the present utility model has the following beneficial effects compared with the prior art: The spacer divides the inner cavity of the arc extinguishing chamber 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 extends into the first arc channel, and the other contact pieces on the moving contact head 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 small current breaking, and the second arc channel is used to handle large current. It can fully take into account the situation of small current breaking when suitable for large current breaking, so as to meet the developing breaking requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 An exploded view of the first embodiment of the present utility model;

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

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

[0019] Figure 4 A structural diagram of the moving contact head in the first embodiment of the present utility model;

[0020] Figure 5 A structural diagram of the covering member in the first embodiment of the present utility model;

[0021] Figure 6 A structural diagram of the hole plate in the first embodiment of the present utility model;

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

[0023] Figure 8 A perspective view of the second embodiment of the present utility model;

[0024] Figure 9 An internal cross-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. Stationary contact, 121. Stationary contact point, 122. First arc guiding piece, 1221. Stationary arc contact point, 123. Second arc guiding piece, 1231. Mounting part, 1232. Connecting part, 1233. Head; 2. Arc extinguishing chamber, 21. Grid plate, 211. Notch, 2111. First notch, 2112. Second notch, 212. Grid plate leg, 213. Main grid plate, 214. End grid plate, 22. Side plate, 221. Gas generating plate, 23. Spacer plate, 231. Second fin, 24. Arc extinguishing cover, 241. Hole plate, 2411. Vent hole, 2412. Protrusion, 2413. Flange, 242. Cover body, 25. Coating part, 251. First fin, 252. First opposite face, 253. Second opposite face, 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 substance based on the concept of the present utility model should be regarded as within the protection scope of the present utility model.

[0027] In the following description, any concepts related to directions (or orientations) such as up, down, left, right, front, and back are with respect to the position state of the figure being described, aiming to facilitate public understanding. Therefore, they should not be construed as special limitations on the technical solutions provided by the present utility model.

[0028] Embodiment 1: Figures 1 to 4 It is a 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 an energy component of the circuit breaker. When the circuit breaker performs closing and opening operations, the operating mechanism drives the contact system 1 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. The contact system 1 includes a moving contact 11 and a stationary contact 12. The moving contact 11 is a swinging component, while the stationary contact 12 is fixedly arranged. That is, the moving contact 11 realizes contact or separation from the stationary contact 12 through its own swinging.

[0030] The moving contact 11 described above includes a short contact piece 111 and a first long contact piece 112, and 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, 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 described above 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 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, and the first arc guiding piece 122 and the second arc guiding piece 123 are arranged side by side.

[0032] The arc extinguishing chamber 2 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 caliber of the first arc channel is smaller than that of the second arc channel. The above caliber can also be called 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 enter the grid piece 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 array of grid pieces 21. More preferably, the mounting portion 1231 is trapezoidal, the connecting portion 1232 is an arched and slender 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 arcing piece group. In this embodiment, the first arc contact point 1121 is in contact and cooperation with the first arcing piece 122. During the closing process of the contact system 1, the contact between the first arc contact point 1121 and the first arcing piece 122 precedes the contact between the moving contact point 1111 and the static contact point 121. When the contact system 1 separates, the separation between the first arc contact point 1121 and the first arcing 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 arcing piece 122. Preferably, a static arc contact point 1221 is provided on the first arcing 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 diameter of the first arc channel is smaller than that 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 plates 21 include main grid plates 213 and end grid plates 214. There are multiple main grid plates 213 and multiple end grid plates 214. The multiple main grid plates 213 are arrayed together to form a group. Similarly, the multiple end grid plates 214 are arrayed together to form a group. A group of end grid plates 214 is located on the side of a group of main grid plates 213 away from the static contact 12. The difference between the end grid plates 214 and the main grid plates 213 is that the grid legs 212 of the end grid plates 214 are shorter than the grid legs 212 of the main grid plates 213.

[0038] The first arc channel formed by the spacer plate 23 and the adjacent side plate 22 constitutes a first narrow slit 100. That is, the first narrow slit 100 is formed in the first arc channel. Preferably, in order to facilitate gas generation, a gas generation plate 221 is attached to the side plate 22, and the spacer plate 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 leg 212. Specifically, the head of the first long contact piece 112 extends past the extended end of the grid leg 212 of the main grid plate 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 cooperatively installed with the spacer plate 23 and covers the grid legs 212 on the left side of the grid plates 21. The right covering member 25 and the right side plate 22 cover the grid legs 212 on the right side of the grid plates 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 adjacent grid legs 212. For the left covering member 25, since the spacer plate 23 also has second fins 231 extending towards the grid legs 212, the second fins 231 are also embedded into adjacent grid legs 212. Specifically, in the extending direction of the grid 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 legs 212.

[0041] In this embodiment, the remaining contact pieces of the moving contact 11 further include a second long contact piece 113. The short contact piece 111 is located outside the arc extinguishing chamber 2, while 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 extended length.

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

[0043] To ensure that the arc is preferentially generated on the first arc contact point 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 of the first arc contact point 1121 with the first arc guiding piece 122 precedes the contact of the second arc contact point 1131 with the second arc guiding piece 123. And when the contact system 1 separates, the separation of the first arc contact point 1121 from the first arc guiding piece 122 is later than the separation of the second arc contact point 1131 from the second arc guiding piece 123, whereby it can be ensured that the arc is generated on the first arc contact point 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 of the first arc contact point 1121 with the first arc guiding piece 122, the contact of the second arc contact point 1131 with the second arc guiding piece 123, and the contact of the moving contact point 1111 with the static contact point 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 3After a pair of covering members 25 are installed in place, they face each other. On the opposite sides of the covering members 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. 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 is also a contact portion 254 on the covering member 25. A pair of contact portions 254 are in contact and cooperate with the installation of the moving arc-initiating piece of the arc extinguishing chamber 2.

[0046] See Figure 6 And in combination with Figure 1 、 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 a hole plate 241, a cover body 242, and a deionization component (not shown in the figure). The deionization component is located above the hole plate 241. More specifically, the hole plate 241 and the deionization component are both accommodated inside the cover body 242. The hole plate 241 has uniformly arranged ventilation holes 2411 and protrusions 2412. The protrusions 2412 extend downward from the lower side surface of the hole 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 placed between adjacent ventilation holes 2411 in the width direction of the hole 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 hole plate 241.

[0047] Specifically, the hole plate 241 has a plurality of rows of ventilation holes 2411 corresponding to the gaps between adjacent grid plates 21. There are protrusions 2412 in the rows of ventilation holes 2411, and the protrusions 2412 are embedded into the gaps between adjacent grid plates 21. Above, the ventilation holes 2411 do not require being located within the gaps between the grid plates 21, and part of the ventilation holes 2411 can also be located within the gaps between the grid plates 21. Preferably, there are at least two protrusions 2412, and the protrusions 2412 are evenly distributed in the width direction of the hole 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.

[0048] Further, 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. Preferably, the protrusion height of the protrusion 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.

[0049] More preferably, in order to facilitate the embedding of the protrusion 2412 into the adjacent grid piece 21, the protrusion 2412 is a conical protrusion, that is, the extension end of the protrusion 2412 is smaller than the bottom of the protrusion 2412. The protrusion 2412 can also be a trapezoidal protrusion. Of course, it can also be a protrusion of other shapes such as triangular. The protrusion 2412 positions the air outlet side of the grid piece 21, so that the grid piece 21 has a better installation and fixing effect.

[0050] Further, on the upper side of the orifice plate 241, that is, on the side facing the arc extinguishing cover 24, and corresponding to both sides of a pair of side plates 22, there are upward flanges 2413. The flanges 2413 are used for installation and cooperation with the deionization component, and facilitate the orifice plate 241 to carry the deionization component and be received into the inner cavity of the cover body 242 together.

[0051] 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 arcing piece 122 is the latest compared to the separation of the second long contact piece 113 from the second arcing 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 piece 21 and extinguishes. For small currents, the small current only passes through the first arc channel, specifically enters the grid piece 21 after passing through the first narrow slit 100 and extinguishes, but when the current is large, 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 second arc channel, specifically passes through the flared opening 300 and then enters the grid piece 21 through the second narrow slit 200.

[0052] The diameter d1 of the first narrow slit 100 is smaller than the diameter 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, a larger diameter of the second narrow slit 200 than that of the first narrow slit 100 can better meet the requirements of large currents.

[0053] Further, seeFigure 3 The flared opening 300 forms an included angle A, and the included angle A preferably corresponds to the second long contact piece 113 and the short contact piece 111.

[0054] 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 diameter of the second narrow slit 200 is larger than that of the first narrow slit 100, the opening of the second notch 2112 is larger than that of the first notch 2111.

[0055] This structure can fully take into account the small current breaking situation while being suitable for large current breaking.

[0056] Embodiment 2: As Figures 7 to 9 is a schematic diagram of the second embodiment.

[0057] The difference between the second embodiment and the first embodiment is 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.

[0058] 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 improve 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 and becomes wider.

[0059] 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 narrow slit 100 is formed in the first arc channel, and the second narrow slit 200 is formed in the second arc channel. The first long contact piece 112 extends into the first narrow slit 100, the second long contact piece 113 extends into the second narrow slit 200, and 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 piece 21 to be extinguished through the first narrow slit 100. When the current is large, an arc is also generated on the second long contact piece 113 and enters the grid piece 21 to be extinguished through the second narrow slit 200. At this time, the requirements for breaking large and small currents are taken into account.

Claims

1. A contact arc extinguishing device, comprising a contact system (1) and an arc extinguishing chamber (2), wherein a moving contact (11) of the contact system (1) comprises at least one first long contact piece (112), and the separation of the first long contact piece (112) from the stationary contact (12) of the contact system (1) is later than the separation of the remaining contact pieces on the moving contact (11) from the stationary contact (12); the arc extinguishing chamber (2) comprises a grid piece (21), a pair of side plates (22) and a partition plate (23), a plurality of grid pieces (21) are arrayed between the pair of side plates (22), and the partition plate (23) divides the inner cavity of the arc extinguishing chamber (2) into at least one first arc channel and one second arc channel, characterized in that: The first long contact piece (112) extends into the first arc channel, the remaining contact pieces on the moving contact (11) correspond to the second arc channel, and the caliber of the first arc channel is smaller than that of the second arc channel.

2. A contact arc extinguishing device according to claim 1, characterized in that: The remaining contact pieces of the moving contact (11) further include a second long contact piece (113), a first narrow slit (100) is formed in the first arc channel, and a second narrow slit (200) is formed in the second arc channel, the second long contact piece (113) extends into the second narrow slit (200), and the diameter of the first narrow slit (100) is smaller than the diameter of the second narrow slit (200).

3. A contact arc extinguishing device according to claim 1, characterized in that: The remaining contact pieces of the moving contact (11) include a short contact piece (111); a first narrow slit (100) is formed in the first arc channel, and a second narrow slit (200) and a flared opening (300) are formed in the second arc channel; 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 first long contact piece (112) extends into the first narrow slit (100), and the diameter of the first narrow slit (100) is smaller than the diameter of the second narrow slit (200).

4. A contact arc extinguishing device according to claim 1, characterized in that: The remaining contact pieces of the moving contact (11) include a short contact piece (111) and a second long contact piece (113); a first narrow slit (100) is formed in the first arc channel, and a second narrow slit (200) and a flared opening (300) are formed in the second arc channel; the flared end of the flared opening (300) corresponds to the short contact piece (111) and the second long contact piece (113); the narrowed end of the flared opening (300) corresponds to the second narrow slit (200); the first long contact piece (112) extends into the first narrow slit (100); the short contact piece (111) is located outside the arc extinguishing chamber (2); the second long contact piece (113) extends into the flared opening (300) and is located outside the second narrow slit (200); the diameter of the first narrow slit (100) is smaller than the diameter of the second narrow slit (200).

5. A contact arc extinguishing device according to claim 4, characterized in that: The short contact piece (111) has a moving contact (1111), the first long contact piece (112) has a first arc contact (1121), and the second long contact piece (113) also has a second arc contact (1131); the static contact (12) comprises a conductive block and a static contact (121) fixedly arranged on the conductive block, the static contact (121) contacts and cooperates with the moving contact (1111), and a conductive block is also fixedly arranged There is an arc-striking plate group, which is located on the side of the static contact (121) facing the arc extinguishing chamber (2), and the arc-striking plate group includes a first arc-striking plate (122) and a second arc-striking plate (123). The first arc-striking plate (122) and the second arc-striking plate (123) are arranged side by side, the first arc contact (1121) is in contact with the first arc-striking plate (122), and the second arc contact (1131) is in contact with the second arc-striking plate (123).

6. A contact arc extinguishing device according to any one of claims 2, 3 and 4, characterized in that: The first narrow slit (100) is formed by the partition plate (23) and a side plate (22).

7. A contact arc extinguishing device according to claim 4, characterized in that: The grid sheet (21) comprises a base, and a notch (211) is provided on a side of the base facing the contact system (1); the grid sheet (21) also has at least one grid sheet leg (212); the notch (211) comprises a first notch (2111) and a second notch (2112); the first notch (2111) corresponds to the first narrow slit (100), and the second notch (2112) corresponds to the second narrow slit (200).

8. A contact arc extinguishing device according to claim 3, characterized in that: The arc extinguishing chamber (2) further comprises a covering member (25), wherein the covering member (25) is a pair, and the grid (21) also has two grid legs (212), wherein the covering member (25) on the left side is installed in cooperation with the partition plate (23) and covers the grid leg (212) on the left side of the grid (21); and the covering member (25) on the right side is installed in cooperation with the side plate (22) on the right side and covers the grid leg (212) on the right side of the grid (21).

9. A contact arc extinguishing device according to claim 8, characterized in that: A first opposing surface (252) and a second opposing surface (253) are provided on opposite sides of the covering member (25); the second narrow slit (200) is formed by a pair of first opposing surfaces (252); and the flared opening (300) is formed by a pair of second opposing surfaces (253).

10. A contact arc extinguishing device according to claim 1, characterized in that: The first arc channel and the second arc channel are both one, and the first long contact piece (112) is one, and its thickness is greater than the thickness of the other contact pieces on the moving contact (11).

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