Static contact assembly and circuit breaker

Abstract

The utility model provides a static contact assembly and a circuit breaker. The static contact assembly comprises a static contact plate, a gas production liner connected with the static contact plate, and a static arc striking sheet connected with the static contact plate, the gas production liner is at least partially spaced between the static arc striking sheet and the static contact plate, and one side of the gas production liner facing the static arc striking sheet is provided with a first groove used for placing the static arc striking sheet. The static arc striking piece is provided with a first groove body and a second groove body which penetrate through the static arc striking piece, the second groove body is located on the side edge of the static arc striking piece, the first groove body is located in the internal area of the static arc striking piece, and the first groove body and the second groove body are communicated to form a connecting channel; a protruding block is arranged in the first groove of the gas production gasket, the protruding block is matched with the first groove body and the connecting channel in shape and is inserted into the first groove body and the connecting channel so that the protruding block can make contact with the arc root of an electric arc, the inner area of the static arc striking piece is divided into two parts by the protruding block, the electric arc is increased, the arcing time is shortened, and the electric arc is rapidly extinguished.

Description

Technical Field

[0001] The utility model relates to the field of electrical accessories, in particular to a static contact assembly and a circuit breaker. Background Art

[0002] As a crucial component of power distribution networks, circuit breakers quickly and promptly cut off power when faults such as overloads and short circuits occur, protecting equipment and personnel. A crucial component of a circuit breaker is one or more sets of static contacts and their associated moving contacts. When a fault occurs in a circuit, the circuit breaker detects that the current exceeds its preset protection threshold, triggering the operating mechanism to rapidly separate the moving and static contacts. During this disconnection process, the excessive voltage and current can cause an arc to form between the static and moving contacts, creating an arc flow.

[0003] The arc extinguishing system of existing circuit breakers generally extinguishes the arc by adding grids, but the space inside the circuit breaker is limited after all, and the arc extinguishing system has a bottleneck in extinguishing high voltage and large current within the same space; the arc extinguishing system of existing circuit breakers also extinguishes the arc by setting gas-generating materials to improve the arc extinguishing performance, but there is still a lack of research on how to set the gas-generating materials. Utility Model Content

[0004] The purpose of the utility model is to solve the technical problem that the arc extinguishing system of the circuit breaker in the prior art has a complex structure and cannot extinguish the arc quickly, especially at high voltage.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A stationary contact assembly comprises: a stationary contact plate, a gas generating pad connected to the stationary contact plate, and a stationary arc striking piece connected to the stationary contact plate, wherein the gas generating pad is at least partially spaced between the stationary arc striking piece and the stationary contact plate.

[0007] The gas generating pad is provided with a first groove for placing the static arc striking piece on the side facing the static arc striking piece, and the static arc striking piece is provided with a first groove body and a second groove body that penetrate the static arc striking piece, the second groove body is located at the upper edge of the side where the static arc striking piece is connected to the static contact plate, the first groove body is located in the internal area of ​​the static arc striking piece, and the first groove body and the second groove body are connected to each other to form a connecting channel; a protrusion is provided in the first groove of the gas generating pad, and the protrusion matches the shape of the first groove body and the connecting channel, and is inserted into the first groove body and the connecting channel so that the protrusion contacts the root of the arc.

[0008] Furthermore, there is a gap between the protrusion and the first slot body and the connecting channel.

[0009] Furthermore, the thickness of the static arc-striking piece is the same as the groove depth of the first groove, and the thickness of the protrusion is not greater than the thickness of the static arc-striking piece.

[0010] Furthermore, a boss is provided on the side of the static contact plate facing the gas generating pad, a notch is provided at the lower portion of the gas generating pad, the notch is at least partially arranged to correspond to the second slot body, and the boss at least partially extends into the notch and the second slot body.

[0011] Furthermore, the boss includes an integrally formed first connecting portion and a second connecting portion, the first connecting portion is vertically connected to the second connecting portion, the notch includes a first mounting groove, a second mounting groove connected to the first mounting groove, and a third mounting groove connected to the second mounting groove, the third mounting groove is at least partially arranged to correspond to the second groove body; the first connecting portion is inserted into the first mounting groove of the notch, and the second connecting portion is inserted into the second groove body, the second mounting groove and part of the third mounting groove.

[0012] Furthermore, a static contact is provided on the static contact plate, the static contact is in the shape of an elongated strip, the second connecting portion is arranged adjacent to the static contact, and the length direction of the second connecting portion is parallel to the length direction of the static contact.

[0013] Furthermore, the static arc-striking piece is symmetrically provided with two second through holes on both sides of the second slot body, the static contact plate is provided with a mounting boss, and two second mounting holes are symmetrically provided on the mounting boss, the mounting boss extends into the third mounting slot, and the second through hole is matched with the second mounting hole, and the static arc-striking piece is connected to the boss with bolts for connecting and fixing the static arc-striking piece and the static contact plate.

[0014] The present application also provides a circuit breaker, comprising an arc extinguishing chamber, a moving contact structure and a static contact assembly according to any of the above schemes, wherein the arc extinguishing chamber is provided with a grid assembly.

[0015] Furthermore, the grid plate assembly includes a plurality of grid plates stacked at intervals, the grid plates are provided with grid plate notches corresponding to the arc entrances of the arc extinguishing chamber, the grid plate of the grid plate assembly closest to the static contact assembly is the first grid plate, and the first grid plate is provided with a first gas-generating part.

[0016] Furthermore, two first gas producing parts are provided on the first grid plate and are spaced apart from each other, and the gap between the two first gas producing parts corresponds to the static arc-striking piece of the static contact assembly.

[0017] Furthermore, a movable arc-striking piece is provided on the side of the arc-extinguishing chamber away from the first gas-generating part, and the movable arc-striking piece is connected to the third gas-generating part.

[0018] Furthermore, the thickness of the first grid sheet is greater than the thickness of the remaining grid sheets.

[0019] Furthermore, the arc extinguishing chamber housing includes a first housing and a second housing assembled with the first housing, and the grid assembly is disposed within a cavity formed by the first and second housings. Both the first and second housings are provided with second gas generating members on the inner side of the arc entrance of the arc extinguishing chamber, and the second gas generating members extend into the arc extinguishing notches of the plurality of grid members.

[0020] Furthermore, an air flow channel is provided between the side of the movable arc-striking piece away from the arc entrance of the arc-extinguishing chamber and the arc-extinguishing chamber shell of the arc-extinguishing chamber.

[0021] Furthermore, the edge of the inlet side of the arc extinguishing chamber shell is the lower edge of the arc extinguishing chamber, the vertical distance between the lower edge of the first gas producing part and the lower edge of the arc extinguishing chamber is H, the vertical distance between the upper edge of the second gas producing part and the lower edge of the arc extinguishing chamber is h, and the ratio of H to h is in the range of 1.2-2.

[0022] Furthermore, the movable arc-striking piece includes a first flat plate portion and a first bent portion integrally connected to the first flat plate portion, the width of the first bent portion is smaller than the corresponding edge width of the first flat plate portion, the first flat plate portion and the grid are stacked at intervals, and the first bent portion bends and extends toward the arc extinguishing notch of the grid; the third gas-producing part is provided with a second flat plate portion corresponding to the first flat plate portion, and the second flat plate portion is integrally formed with a pair of second bent portions, and the first bent portion is provided between the two second bent portions.

[0023] Furthermore, a flame extinguishing chamber is provided in the arc extinguishing chamber, and the flame extinguishing chamber is provided between the grid assembly and the arc outlet of the arc extinguishing chamber, and includes at least one flame extinguishing plate, and a plurality of through holes are arranged on the flame extinguishing plate, and the through holes on the flame extinguishing plate gradually become larger from one side edge to the opposite other side edge.

[0024] Since the static contact assembly of the present application adopts a matching structure of a static arc-striking piece and a gas-generating pad, the protrusion of the gas-generating pad is in direct contact with the arc root, gas is generated under the burning of the arc root, and the gas blowing and arc cooling effects are enhanced. In addition, the internal area of ​​the static arc-striking piece is divided into two parts by the protrusion, and the arc is divided during the arc running process, which increases the arc voltage, thereby reducing the arc burning time and quickly extinguishing the arc.

[0025] In addition, a boss is provided on the static contact plate, and the boss at least partially extends into the notch of the gas generating pad and the second slot of the static arc striking piece, which is conducive to quickly guiding the arc to the static arc striking piece and the gas generating pad.

[0026] At the same time, the present application also provides a circuit breaker, the arc extinguishing chamber of the circuit breaker adopts a matching structure of the grid assembly and the first gas producing part, which has a simple structure. The first gas producing part is arranged close to the static contact assembly, which increases the gas production efficiency and quickly extinguishes the arc.

[0027] In addition, the arc extinguishing chamber is also provided with a moving arc-striking piece and a third gas-producing part. The moving arc-striking piece guides the arc generated from the moving contact to move toward the arc extinguishing chamber. The third gas-producing part is burned by the arc generated by the moving contact to produce gas, pushing the arc into the arc chamber, thereby quickly extinguishing the arc. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a structural cross-sectional view of the utility model circuit breaker after the moving and static contacts are separated;

[0029] Figure 2 This is a structural cross-sectional view of the circuit breaker of the utility model after the moving and static contacts are closed;

[0030] Figure 3 It is a structural diagram of the arc extinguishing chamber of the utility model;

[0031] Figure 4 It is an exploded view of the arc extinguishing chamber of the utility model;

[0032] Figure 5 It is a schematic diagram of the static contact assembly of the utility model;

[0033] Figure 6 This is an exploded view of the static contact assembly of the utility model;

[0034] Figure 7 This is a schematic diagram of the installation of the movable arc-starting piece and the third gas-generating component of the utility model;

[0035] Figure 8 This is an exploded schematic diagram of the movable arc-starting piece and the third gas-generating component of the utility model;

[0036] Figure 9 It is a schematic diagram of the static contact plate of the utility model;

[0037] Figure 10 It is a schematic diagram of the relative positions of the first gas producing component and the second gas producing component of the utility model;

[0038] Figure 11 It is a schematic diagram of the flame extinguishing piece of the utility model;

[0039] Figure 12 It is a schematic diagram of the airflow channel of the utility model;

[0040] Figure 13 This is a schematic diagram of the airflow in the arc extinguishing chamber of the utility model;

[0041] Figure 14 It is a schematic diagram of the structure of the movable contact of the utility model.

[0042] Reference numerals include:

[0043] 1-first housing; 2-second housing; 3-static contact assembly; 31-static arc-striking piece; 311-first slot; 312-second slot; 313-connecting channel; 314-first through hole; 315-second through hole; 32-gas generating pad; 321-bump; 322-first groove; 323-notch; 324-first mounting hole; 325-third through hole; 33-static contact plate; 331-boss; 3311-first connecting portion; 3312-second connecting portion; 3313-second connecting hole; 332-second groove; 333-third groove; 334-static contact; 3 35-third mounting hole; 4-arc extinguishing chamber; 41-grid assembly; 411-first grid; 412-grid; 42-first gas-producing part; 43-moving arc-starting piece; 431-first flat plate; 432-first bent portion; 44-third gas-producing part; 441-second flat plate; 442-second bent portion; 45-second gas-producing part; 46-flame extinguishing chamber; 461-pad; 462-flame extinguishing piece; 463-cover plate; 464-through hole; 5-moving contact structure; 51-extended contact piece; 52-contact support; 53-partition; 54-contact plate; 55-moving contact; 6-circuit breaker. DETAILED DESCRIPTION

[0044] The following embodiments are given in conjunction with the accompanying drawings to further illustrate the specific implementation of the present utility model. The protection scope of the present utility model is not limited to the description of the following embodiments.

[0045] like Figure 1 and Figure 2 As shown, the present application provides a circuit breaker 6, which includes a moving contact structure 5, a static contact assembly 3 cooperating with the moving contact structure 5, and an arc extinguishing chamber 4 arranged inside the circuit breaker 6, and the arc extinguishing chamber 4 is used to extinguish the arc generated during the opening and closing of the moving contact structure 5 and the static contact assembly 3.

[0046] like Figure 5 、 6 As shown, the stationary contact assembly 3 includes a stationary contact plate 33, at least one stationary arc-striking piece 31 connected to the stationary contact plate 33, and a gas-generating pad 32 detachably fixedly connected to the stationary contact plate 33. The stationary contact plate 33 serves as a stationary contact for contacting or separating with the movable contact 55 of the movable contact structure. Preferably, a stationary contact point 334 is provided on the stationary contact plate 33, but this point can also be omitted, allowing the stationary contact plate 33 to directly engage with the movable contact 55. The stationary arc-striking piece 31 is disposed on the gas-generating pad 32 and connected to the stationary contact plate 33, directing the arc on the stationary contact plate 33 toward the arc extinguishing chamber 4. The gas-generating pad 32 is mounted on the stationary contact plate 33 and at least partially spaced between the stationary arc-striking piece 31 and the stationary contact plate 33, protecting the stationary contact plate 33 from arc burns. After being heated by the arc, the gas generated accelerates the arc and blows it toward the arc extinguishing chamber 4.

[0047] like Figure 5 、 6 As shown, the gas generating pad 32 is provided with a first groove 322 on the side facing the static arc-striking piece 31 for placing the static arc-striking piece 31, and the static arc-striking piece 31 is provided with a first groove body 311 and a second groove body 312 that penetrates the static arc-striking piece 31, and the second groove body 312 is located on the side where the static arc-striking piece 31 is connected to the static contact plate 33. In this embodiment, the second groove body 312 is a notch on the lower side of the static arc-striking piece 31, and the first groove body 311 is located in the internal area of ​​the static arc-striking piece 31. The first groove body 311 and the second groove body 312 are connected to each other. A connecting channel 313 is formed; a protrusion 321 is provided in the first groove 322 of the gas-generating pad 32, and the protrusion 321 matches the shape of the first groove body 311 and the connecting channel 313, and is inserted into the first groove body 311 and the connecting channel 313, so that the protrusion 321 is in direct contact with the arc root, and gas is generated under the burning of the arc root, thereby enhancing the gas blowing and cooling effect of the arc. The static arc-starting piece 31 is divided into two parts by the protrusion 321, and the arc is divided during the arc running process, which increases the arc voltage, thereby reducing the arc burning time and quickly extinguishing the arc.

[0048] The gas generating pad 32 is arranged on the static contact plate 33 , and the number of the gas generating pad 32 is at least one. The gas generating pad 32 is a gas generating insulating plastic, which can generate gas to cool the arc and blow the arc toward the arc extinguishing chamber 4 when heated.

[0049] The static arc-striking piece 31 is usually made of a metal material that is easily magnetized. The static arc-striking piece 31 is penetrated by at least one first groove body 311 and at least one second groove body 312. The first groove body 311 and the second groove body 312 are connected to each other to form a connecting channel 313; the second groove body 312 is a notch on the lower side of the static arc-striking piece 31. The static arc-striking piece 31 is connected to the static contact plate 33 through the lower side. The first groove body 311 is located in the middle area of ​​the static arc-striking piece 31.

[0050] Preferably, the depth of the first groove 322 is the same as the thickness of the static arc-striking piece 31, so that the static arc-striking piece 31 is entirely located in the first groove 322. Of course, the depth of the first groove 322 may also be not greater than or less than the thickness of the static arc-striking piece 31.

[0051] Preferably, there is a gap between the protrusion 321 and the first slot 311 and the connecting channel 313 in this embodiment, which is conducive to arc movement. Of course, in other embodiments, the protrusion 321 can be in contact with the side walls of the first slot 311 and the connecting channel 313.

[0052] Preferably, the thickness of the protrusion 321 of this embodiment is not greater than the thickness of the static arc-starting plate 31; the protrusion 321 includes an integrally formed first protrusion 3211 and a second protrusion 3212, the first protrusion 3211 is inserted into the first groove body 311, and the cross-section of the first protrusion 3211 is preferably square, and the shape of the first groove body 311 is matched with the shape of the first protrusion 3211, the second protrusion 3212 is inserted into the connecting channel 313, and the cross-section of the second protrusion 3212 is preferably rectangular, and the shape of the second protrusion 3212 is matched with the shape of the connecting channel 313, and at the same time, the size of the cross section of the connecting channel 313 at the connection between the first groove body 311 and the second groove body 312 is smaller than the size of the corresponding connecting edge of the cross section of the first groove body 311 and the second groove body 312; there is a gap between the second protrusion 3212 and the connecting channel 313.

[0053] like Figure 5 、 6 9 is a preferred embodiment of the static contact plate 33, wherein a third groove 333 is provided through the cross section at the lower part of the static contact plate 33, and a sheet-shaped static contact 334 is provided in the third groove 333. The static contact 334 is provided in cooperation with the moving contact 5, and the static contact 334 is in contact with or disconnected from the moving contact 5, thereby realizing the connection or disconnection of the circuit breaker 6.

[0054] The static contact plate 33 is provided with a boss 331 on the side facing the gas-generating pad 32, and a notch 323 is provided at the lower part of the gas-generating pad 32. The lower part of the static arc-striking plate 31 is provided with a penetrating second groove body 312, and the notch 323 is at least partially arranged to correspond to the second groove body 312, that is, the second groove body 312 is stacked above the notch 323; the boss 331 cooperates with the notch 323 and the second groove body 312, and the boss 331 at least partially extends into the notch 323 and the second groove body 312. The cross-section of the boss 331 of this embodiment is an inverted T-shape, and the boss 331 includes an integrally formed first connecting portion 3311 and a second connecting portion 3312, and the first connecting portion 3311 is vertically connected to the second connecting portion 3312; the notch 323 includes a first mounting groove 3231, a second mounting groove 3232 connected to the first mounting groove 3231, and a third mounting groove 3233 connected to the second mounting groove 3232, and the third mounting groove 3233 is at least partially arranged to correspond to the second slot body 312; the first connecting portion 3311 is inserted into the first mounting groove 3231 of the notch 323, and the second connecting portion 3312 is inserted into the second slot body 312, the second mounting groove 3232 and part of the third mounting groove 3233. The static contact 334 is elongated, with the second connecting portion 3312 positioned adjacent to it and parallel to its length. This facilitates directing the arc from the static contact 334 of the static contact plate 33 to the static arc-striking piece 31. Of course, the boss 331 can also have other shapes, such as a rectangle or trapezoid. At least one second groove 332 is provided on the side of the static contact plate 33 facing the static arc-striking piece 31. The lower portion of the gas-generating pad 32 engages within this second groove 332.

[0055] A first through hole 314 is provided on the upper part of the static arc-striking piece 31, and a first mounting hole 324 is provided in the first groove 322 of the gas-generating pad 32 corresponding to the first through hole 314, and the static arc-striking piece 31 is bolted to the gas-generating pad 32; two second through holes 315 are symmetrically provided on both sides of the second groove body 312 at the lower part of the static arc-striking piece 31, and a mounting boss is provided on the upper part of the boss 331 of the static contact plate 33, and two second mounting holes 3313 are symmetrically provided on the mounting boss, and the mounting boss extends into the third mounting groove 3233, and the second through hole 315 is provided corresponding to the second mounting hole 3313, and is used to connect and fix the static arc-striking piece 31 and the static contact plate 33 by bolts.

[0056] Two third through holes 325 are symmetrically provided near the side of the lower part of the gas-generating pad 32, and two third mounting holes 335 are symmetrically provided in the second groove 332 of the static contact plate 33. The third through holes 325 and the third mounting holes 335 are matched with each other, and the gas-generating pad 32 is bolted to the static contact plate 33.

[0057] like Figure 3 and Figure 4 The arc-extinguishing chamber 4 shown includes an arc-extinguishing chamber housing, a grid assembly 41 disposed within the arc-extinguishing chamber housing, and a flame-extinguishing chamber 46. The arc-extinguishing chamber housing of this embodiment includes a first housing 1 and a second housing 2 assembled together; the first housing 1 and the second housing 2 are assembled to form a cavity, within which the grid assembly 41 is disposed. The grid assembly 41 includes a plurality of grids 412 stacked at intervals, each having grid notches corresponding to the arc inlet of the arc-extinguishing chamber 4. The flame-extinguishing chamber 46 is disposed between the grid assembly 41 and the arc outlet of the arc-extinguishing chamber 4 and includes at least one flame-extinguishing plate 462. The arc extinguishing chamber 4 also includes a moving arc-striking plate 43; a third gas-producing part 44 is arranged in cooperation with the moving arc-striking plate 43; the grid notches corresponding to the multiple grid plates 412 on the inner side of the first shell 1 and the second shell 2 are each provided with a second gas-producing part 45; the moving arc-striking plates 43 are stacked at intervals on one side of the grid plate assembly 41, and the grid plate 412 of the grid plate assembly 41 farthest from the moving arc-striking plate 43 is the first grid plate 411, that is, the grid plate 412 closest to the static contact assembly is the first grid plate 411, and a first gas-producing part 42 is provided on the side of the first grid plate 411 away from the grid plate, which is used to cooperate with the static arc-striking plate 31 of the static contact assembly 3, and the first gas-producing part 42 is burned by the arc generated by the static contact plate 33 to produce gas, pushing the arc into the arc chamber 4, thereby quickly extinguishing the arc. In this embodiment, two first gas producing parts 42 are provided on the first grid 411 and spaced apart from each other. The gap between the two first gas producing parts 42 corresponds to the static arc-striking piece 31 of the static contact assembly. Of course, one or more first gas producing parts 42 can also be provided.

[0058] The grid is made of metal. The first grid 411 is arranged at the outermost side of the grid assembly 41 away from the moving arc-starting piece 43. The first grid is stacked with the grid, and the rear end of the grid does not exceed the first grid. A first gas-generating part 42 is provided on the side of the first grid away from the grid. Preferably, the thickness of the first grid 411 is greater than the thickness of the grid 412, thereby improving the burn resistance of the first grid 411. The bottom of the arc-extinguishing notch of the grid of the grid assembly 41 is located on one side of the grid centerline, and the bottoms of the arc-extinguishing notches of adjacent grids 412 are staggered. The arc-extinguishing notches of adjacent grids are respectively located on both sides of the grid centerline. Usually, the same grid is alternately arranged in front and back so that the bottoms of the arc-extinguishing notches of adjacent grids are staggered, thereby improving arc cutting performance.

[0059] like Figure 4The flame extinguishing chamber 46 shown in FIG. 4 includes a backing plate 461 disposed on the upper portion of the grid assembly 41, a flame extinguishing plate 462 disposed on the upper portion of the backing plate 461, and a cover plate 463 disposed on the upper portion of the flame extinguishing plate 462. Figure 11 As shown, the flame extinguishing plate 462 is provided with a plurality of through holes 464. Preferably, the through holes 464 on the flame extinguishing plate 462 gradually increase in size from one side to the opposite side. The flame extinguishing plate 462 may be an insulating plate or a metal mesh, and the plurality of flame extinguishing plates 462 may be made of different materials.

[0060] like Figure 7 and Figure 8 As shown, the arc-striking piece 43 is provided at the opening position of the arc-extinguishing chamber 4 adjacent to the moving contact 55. A third gas-generating part 44 is riveted on the arc-striking piece 43. The arc-striking piece guides the arc generated from the moving contact 55 to move toward the arc-extinguishing chamber 4. The third gas-generating part 44 is burned by the arc generated by the moving contact 55 to produce gas, pushing the arc into the arc-extinguishing chamber 4, thereby quickly extinguishing the arc. Figure 12 As shown, an air flow channel is provided between the side of the movable arc-striking piece 43 away from the arc entrance of the arc-extinguishing chamber 4 and the shell of the arc-extinguishing chamber 4, and the spacing between the air flow channels is L, so that the arc airflow in the arc-extinguishing chamber 4 flows out from the air flow channel; the movable arc-striking piece 43 includes a first flat portion 431 and a first bent portion 432 integrally connected to the first flat portion 431, the width of the first bent portion 432 is smaller than the corresponding side width of the first flat portion 431, the first flat portion 431 and the grid 412 are stacked at intervals, and the first bent portion 432 is bent and extended toward the arc-extinguishing notch of the grid 412; the third gas-producing part 44 is provided with a second flat portion 441 corresponding to the first flat portion 431, and the second flat portion 441 is integrally formed with a pair of second bent portions 442, and the first bent portion 432 is provided between the two second bent portions 442.

[0061] like Figure 10 As shown in the second gas producing member 45, the first shell 1 and the second shell 2 are both provided with a second gas producing member 45 on the inner side of the arc entrance of the arc extinguishing chamber 4, and the second gas producing member 45 extends into the arc extinguishing gaps of the plurality of grids 412. Figure 10 Taking the upper and lower directions in the figure as an example, the edge of the inlet side of the arc extinguishing chamber shell is the lower edge of the arc extinguishing chamber 4, the vertical distance between the lower edge of the first gas producing part 42 and the lower edge of the arc extinguishing chamber 4 is H, and the vertical distance between the upper edge of the second gas producing part 45 and the lower edge of the arc extinguishing chamber 4 is h. The ratio range of H to h is 1.2-2, which can not only ensure that the metal grid is not burned by the arc, but also ensure that the air flow channel is not too small to have a counterproductive effect, so as to avoid interference between the gas producing parts and cooperate to blow the arc into the arc extinguishing chamber.

[0062] like Figure 14 As shown, the moving contact structure 5 includes a moving contact 55, which cooperates with the static contact assembly 3; the moving contact 55 includes a plurality of moving contact pieces arranged side by side, wherein at least one moving contact piece is an extended contact piece 51; a partition 53, which is detachably connected to the upper part of the moving contact 55, separating the plurality of moving contact pieces; a contact support 52, on which the moving contact 55 is mounted; and a contact plate 54, through which the moving contact 55 is connected to a terminal of the circuit breaker 6.

[0063] The installation process of this embodiment is as follows:

[0064] Assemble the moving contact structure 5, install the contact support 52 on the side of the moving contact 55, install the contact plate 54 on the lower part of the moving contact 55, install the partition 53 on the upper part of the moving contact 55, and install the extended contact on the side of the partition 53;

[0065] Assemble the static contact assembly 3, insert the protrusion 321 of the gas generating pad 32 into the static arc striking plate 31 and install and tighten it, install the static contact plate 33 on the back of the gas generating pad 32, and fit the protective pad to the second groove 332 of the static contact plate 33;

[0066] Assemble the arc extinguishing chamber 4, install the first gas-producing part 42 on the side of the grid assembly 41, install the pad 461 on the grid assembly 41, and install the flame-extinguishing piece 462 on the upper part of the pad 461. The above components are installed in the space assembled with the first shell 1 and the second shell 2, and the cover plate 463 covers the upper part of the flame-extinguishing piece 462. The cover plate 463 is engaged with the upper part of the first shell 1 and the second shell 2, and the second gas-producing part 45 is correspondingly installed on the lower part of the first shell 1 and the second shell 2. The movable arc-striking piece 43 is installed in conjunction with the third gas-producing piece 44, and the movable arc-striking piece 43 is installed on the side of the arc extinguishing chamber 4 away from the first gas-producing piece 42; finally, the movable contact structure 5, the static contact assembly 3 and the arc extinguishing chamber 4 are installed inside the circuit breaker, and the installation is completed.

[0067] When using, such as Figure 1 and Figure 2 As shown, the static contact plate 33 and the moving contact 55 are closed, and the circuit breaker 6 is energized; or when a short circuit or line overload occurs, the static contact plate 33 and the moving contact 55 are separated. At the moment when the static contact plate 33 and the moving contact 55 are closed or separated, an arc is generated between the static contact plate 33 and the moving contact 55. The arc is divided by the protrusion 321 of the gas generating pad 32, thereby increasing the arc and weakening the electric field. The root of the arc is in electrical contact with the protrusion 321, and the protrusion 321 generates gas, which quickly pushes the arc into the arc extinguishing chamber 4.

[0068] The arc electrically stimulates the second gas-producing part 45 located on the side wall of the grid assembly 41, and the second gas-producing part 45 produces gas. The first gas-producing part 42 is burned and produces gas by the arc introduced from the static contact plate 33 by the static arc-striking piece 31. The third gas-producing part 44 is burned and produces gas by the arc introduced from the moving contact 55 by the moving arc-striking piece 43, thereby preventing the arc from burning the internal structure of the circuit breaker 6 and accelerating the arc to enter the arc extinguishing chamber 4. The arc is divided into small arcs by the grid assembly 41, and the small arcs are pushed to the top of the flame extinguishing chamber 46 and are extinguished in the process. The airflow that extinguishes the small arc flows out from the airflow channel and the cover plate 453 of the flame extinguishing chamber 46, quickly reducing the temperature inside the circuit breaker 6, thereby protecting the electrical appliance.

[0069] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, or are conventionally placed directions or positional relationships during use. They are intended solely for ease of description and do not imply that the devices or components referred to must have a specific direction. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely for distinction and description and should not be construed as indicating relative importance.

[0070] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A static contact assembly, comprising: A stationary contact plate (33), a gas generating pad (32) connected to the stationary contact plate (33), and a stationary arc striking piece (31) connected to the stationary contact plate (33), wherein the gas generating pad (32) is at least partially spaced between the stationary arc striking piece (31) and the stationary contact plate (33). The gas generating pad (32) is provided with a first groove (322) for placing the static arc striking piece (31) on the side facing the static arc striking piece (31), and is characterized in that the static arc striking piece (31) is provided with a first groove body (311) and a second groove body (312) penetrating the static arc striking piece (31), the second groove body (312) is located on the side where the static arc striking piece (31) is connected to the static contact plate (33), and the first groove body (311) is located on the side where the static arc striking piece (31) is connected to the static contact plate (33). 1) In an internal area, the first trough body (311) and the second trough body (312) are connected to each other to form a connecting channel (313); a protrusion (321) is provided in the first groove (322) of the gas generating pad (32); the protrusion (321) matches the shape of the first trough body (311) and the connecting channel (313), and is inserted into the first trough body (311) and the connecting channel (313), so that the protrusion (321) contacts the arc root.

2. The static contact assembly according to claim 1, characterized in that: There is a gap between the protrusion (321) and the first slot (311) and the connecting channel (313).

3. The static contact assembly according to claim 2, characterized in that: The thickness of the static arc-striking piece (31) is the same as the groove depth of the first groove (322), and the thickness of the protrusion (321) is not greater than the thickness of the static arc-striking piece (31).

4. The static contact assembly according to any one of claims 1 to 3, characterized in that: The stationary contact plate (33) is provided with a boss (331) on the side facing the gas-generating pad (32), and a notch (323) is provided at the lower part of the gas-generating pad (32). The notch (323) is at least partially arranged to correspond to the second groove body (312), and the boss (331) at least partially extends into the notch (323) and the second groove body (312).

5. The static contact assembly according to claim 4, characterized in that: The boss (331) includes an integrally formed first connecting portion (3311) and a second connecting portion (3312), the first connecting portion (3311) being vertically connected to the second connecting portion (3312), the notch (323) including a first mounting groove (3231), a second mounting groove (3232) communicating with the first mounting groove (3231), and a third mounting groove (3233) communicating with the second mounting groove (3232), the third mounting groove (3233) being at least partially arranged corresponding to the second slot body (312); the first connecting portion (3311) is inserted into the first mounting groove (3231) of the notch (323), and the second connecting portion (3312) is inserted into the second slot body (312), the second mounting groove (3232) and part of the third mounting groove (3233).

6. The static contact assembly according to claim 5, characterized in that: The static contact plate (33) is provided with a static contact point (334), the static contact point (334) is in the shape of an elongated strip, the second connecting portion (3312) is arranged adjacent to the static contact point (334), and the length direction of the second connecting portion (3312) is parallel to the length direction of the static contact point (334).

7. The static contact assembly according to claim 5, characterized in that: The static arc-striking piece (31) is symmetrically provided with two second through holes (315) on both sides of the second slot body (312); the static contact plate (33) is provided with a mounting boss, and two second mounting holes (3313) are symmetrically provided on the mounting boss. The mounting boss extends into the third mounting slot (3233); the second through holes (315) and the second mounting holes (3313) are matched to be provided; the static arc-striking piece (31) is bolted to the boss (331) for connecting and fixing the static arc-striking piece (31) and the static contact plate (33).

8. A circuit breaker, characterized in that: The invention comprises an arc extinguishing chamber (4), a moving contact structure (5) and a static contact assembly according to any one of claims 1 to 7, wherein the arc extinguishing chamber (4) is provided with a grid assembly (41).

9. The circuit breaker according to claim 8, characterized in that: The grid plate assembly (41) comprises a plurality of grid plates (412) stacked at intervals, the grid plates (412) being provided with grid plate notches corresponding to arc entrances of the arc extinguishing chamber (4), the grid plate (412) closest to the static contact assembly of the grid plate assembly (41) being the first grid plate (411), and the first gas generating member (42) being provided on the first grid plate (411).

10. The circuit breaker according to claim 9, characterized in that: Two first gas producing parts (42) are arranged at intervals on the first grid piece (411), and the gap between the two first gas producing parts (42) corresponds to the static arc-striking piece (31) of the static contact assembly.

11. The circuit breaker according to claim 9, wherein: A movable arc-striking piece (43) is provided on a side of the arc-extinguishing chamber (4) away from the first gas-generating piece (42), and a third gas-generating piece (44) is connected to the movable arc-striking piece (43).

12. The circuit breaker according to claim 9, wherein: The thickness of the first grid plate (411) is greater than the thickness of the remaining grid plates (412).

13. The circuit breaker according to claim 9 or 11, characterized in that: The arc extinguishing chamber shell of the arc extinguishing chamber (4) comprises a first shell (1) and a second shell (2) assembled with the first shell (1); the grid plate assembly (41) is arranged in a cavity formed by the first shell (1) and the second shell (2); the first shell (1) and the second shell (2) are both provided with a second gas producing part (45) on the inner side of the arc entrance of the arc extinguishing chamber (4); the second gas producing part (45) extends into the arc extinguishing gaps of the plurality of grid plates (412).

14. The circuit breaker according to claim 11, wherein: An airflow channel is provided between the side of the movable arc-striking piece (43) away from the arc entrance of the arc-extinguishing chamber (4) and the arc-extinguishing chamber shell of the arc-extinguishing chamber (4).

15. The circuit breaker according to claim 13, wherein: The edge of the inlet side of the arc extinguishing chamber shell is the lower edge of the arc extinguishing chamber (4), the vertical distance between the lower edge of the first gas producing part (42) and the lower edge of the arc extinguishing chamber (4) is H, the vertical distance between the upper edge of the second gas producing part (45) and the lower edge of the arc extinguishing chamber (4) is h, and the ratio of H to h is in the range of 1.2-2.

16. The circuit breaker according to claim 11, wherein: The movable arc-striking piece (43) includes a first flat portion (431) and a first bent portion (432) integrally connected to the first flat portion (431), the width of the first bent portion (432) is smaller than the corresponding side width of the first flat portion (431), the first flat portion (431) and the grid (412) are stacked at intervals, and the first bent portion (432) bends and extends toward the arc-extinguishing notch of the grid; the third gas-generating part (44) is provided with a second flat portion (441) corresponding to the first flat portion (431), the second flat portion (441) is integrally formed with a pair of second bent portions (442), and the first bent portion (432) is provided between the two second bent portions (442).

17. The circuit breaker according to claim 9, wherein: A flame extinguishing chamber (46) is provided in the arc extinguishing chamber (4), and the flame extinguishing chamber (46) is provided between the grid assembly (41) and the arc outlet of the arc extinguishing chamber (4), and comprises at least one flame extinguishing plate (462), a plurality of through holes (464) are arranged on the flame extinguishing plate (462), and the through holes (464) on the flame extinguishing plate (462) gradually become larger from one side edge to the other side edge opposite thereto.

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