Arc extinguishing device with multi-stage arc extinguishing grid sheet group

Abstract

The utility model relates to an arc-extinguishing device with a multistage arc-extinguishing grid plate group, which is installed in a circuit breaker and comprises a moving contact and a static contact, one end of the moving contact is provided with a moving contact matching hole which is connected with a circuit breaker transmission mechanism, the static contact is fixedly connected with a circuit breaker base, the circuit breaker transmission mechanism drives the moving contact to move, and the moving contact is connected with the static contact through the moving contact matching hole. The arc extinguishing device further comprises an arc extinguishing assembly, the arc extinguishing assembly comprises an arc blocking piece, a first-level arc extinguishing grid piece set, a second-level arc extinguishing grid piece set and the like, the first-level arc extinguishing grid piece set and the second-level arc extinguishing grid piece set are arranged in the arc blocking piece in a staggered mode, the first-level arc extinguishing grid piece set comprises a plurality of first-level arc extinguishing grid pieces, and the second-level arc extinguishing grid piece set comprises a plurality of second-level arc extinguishing grid pieces. The second-level arc extinguishing grid sheet group comprises a plurality of second-level arc extinguishing grid sheets, and the first-level arc extinguishing grid sheets and the second-level arc extinguishing grid sheets are sequentially arranged at intervals in a staggered mode from bottom to top. According to the utility model, the utilization rate of the arc-extinguishing grids is improved through the first-stage arc-extinguishing grid group and the second-stage arc-extinguishing grid group, the arc-extinguishing capability of the circuit breaker is improved, and the maintenance cost of the circuit breaker is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of circuit breaker equipment technology, especially relate to a kind of arc extinguishing device with multistage arc-extinguishing grid piece group. BACKGROUND

[0002] The arc-extinguishing grid in low-voltage DC circuit breaker is a device used to extinguish electric arc, and its working principle is mainly based on the splitting, lengthening and cooling process of electric arc under the action of magnetic field and grid pieces. In low-voltage DC circuit breaker, when the contacts separate, if the current is large enough, electric arc will be generated between the contacts. Electric arc is a high-temperature and high-brightness discharge phenomenon, and its existence will prolong the breaking time of circuit breaker, and even may cause equipment damage or fire and other serious consequences. Arc-extinguishing grid is usually composed of crossed metal grid pieces (such as steel pieces) with different lengths, and is placed in the arc-extinguishing chamber of insulating material. These grid pieces have good electrical conductivity and thermal conductivity, and also have certain mechanical strength to withstand the high-temperature ablation of electric arc. When electric arc is generated, it will be drawn into the arc-extinguishing grid under the action of magnetic field (which may be generated by electromagnet inside the circuit breaker). Due to the obstruction of grid pieces, electric arc is split into multiple short arcs. As the contacts further separate, electric arc is lengthened between the grid pieces. The lengthened electric arc will increase its resistance, thereby reducing the current intensity of electric arc. When the lengthened electric arc contacts the grid pieces, it will be cooled by the grid pieces. At the same time, the recombination effect on the surface of grid pieces will also consume the charged particles in electric arc, further reducing the intensity of electric arc. When the current intensity of electric arc is reduced to a certain extent, electric arc will be extinguished.

[0003] Arc-extinguishing system plays a crucial role in switchgear. When the contacts of switchgear are disconnected, due to the increase of resistance between contacts and the dramatic increase of surface temperature, a large voltage will be released outward, causing a large number of free electrons in the air around the contacts, thereby forming electric arc. Electric arc is a gas discharge phenomenon, which will damage the contacts and other components in switchgear, endangering the operational stability of switchgear. Therefore, arc-extinguishing system must be used to extinguish electric arc, ensuring the safe operation of electrical system.

[0004] The technical principle of arc-extinguishing grid piece is mainly to increase the voltage drop of electric arc: by using metal grid pieces and other structures, electric arc is split into multiple short arcs, thereby increasing the voltage drop of electric arc, making it difficult to maintain and extinguish. This system is usually used in low-voltage switchgear.

[0005] Arc-extinguishing grid can effectively split, lengthen and cool electric arc, thereby reducing the intensity and temperature of electric arc, making it extinguish quickly. The structure of arc-extinguishing grid is relatively simple, and the manufacturing cost is low. The arc-extinguishing effect of arc-extinguishing grid is influenced by many factors, such as the current, voltage and duration of electric arc, and the material, shape and number of grid pieces. In some cases, such as when the driving force of electric arc is strong or the contact opening distance is insufficient, electric arc may not be effectively introduced into the arc-extinguishing grid, resulting in the failure to extinguish electric arc quickly.

[0006] In summary, the arc-extinguishing grid in the low-voltage DC circuit breaker realizes the purpose of arc-extinguishing by dividing, lengthening and cooling the arc. However, the arc-extinguishing effect is affected by various factors, and needs to be optimized and adjusted according to the specific situation in actual application.

[0007] However, the grid structure of the arc-extinguishing grid is of different lengths at present, increasing the manufacturing cost. At the same time, due to the arc ablation effect, the arc-extinguishing grid needs to be replaced regularly, and the entire arc-extinguishing grid structure needs to be replaced when the arc-extinguishing grid is replaced, increasing the maintenance cost of the equipment. In the working process of the arc-extinguishing grid, the arc-extinguishing grid piece close to the static contact may have almost no ablation marks, while the arc-extinguishing grid piece close to the moving contact may have arc ablation at the opening, but the arc does not completely enter the root of the arc-extinguishing grid piece, resulting in the problem of low utilization efficiency of the arc-extinguishing grid. The utility model discloses

[0008] The utility model discloses to solve the technical problems to provide a kind of arc-extinguishing device with multi-stage arc-extinguishing grid piece group, improve arc-extinguishing grid piece utilization, improve circuit breaker arc-extinguishing capacity, reduce circuit breaker maintenance cost.

[0009] The utility model provides a kind of arc-extinguishing device with multi-stage arc-extinguishing grid piece group, install in circuit breaker, it includes dynamic contact and static contact, the dynamic contact one end is equipped with dynamic contact cooperation hole and circuit breaker transmission mechanism connection, the static contact is fixedly connected with circuit breaker base, circuit breaker transmission mechanism drives dynamic contact movement, it further include arc-extinguishing subassembly, the arc-extinguishing subassembly includes arc blocking piece, mutually staggered arrangement first arc-extinguishing grid piece group and second arc-extinguishing grid piece group, the arc blocking piece includes left and right symmetrically arranged left arc blocking piece and right arc blocking piece, the first arc-extinguishing grid piece group includes with the arc cutout of first arc-extinguishing grid piece cut arc several first arc-extinguishing grid pieces, the second arc-extinguishing grid piece group includes with the arc cutout of second arc-extinguishing grid piece cut arc several second arc-extinguishing grid pieces, the first arc-extinguishing grid piece and second arc-extinguishing grid piece between from bottom to top sequentially mutually staggered and have interval spacing arrangement, the first arc-extinguishing grid piece group and second arc-extinguishing grid piece group install on arc blocking piece, the first arc-extinguishing grid piece group, second arc-extinguishing grid piece group and arc blocking piece jointly constitute arc-extinguishing chamber;The left arc blocking piece and right arc blocking piece are located at static contact left and right sides respectively;The dynamic contact is equipped with dynamic contact point at the end away from circuit breaker transmission mechanism, and the dynamic contact point is located in arc-extinguishing chamber, and the arc cutout of first arc-extinguishing grid piece cut arc and the arc cutout of second arc-extinguishing grid piece cut arc are all located at close to dynamic contact point one end;The static contact is equipped with static contact point, and the dynamic contact point and static contact point separate and open or contact and close;When open, the dynamic contact is away from static contact point, and with dynamic contact point arc leading piece has interval spacing;When close, the dynamic contact point and static contact point contact.

[0010] Preferably, the arc extinguishing assembly further comprises an arc extinguishing grid base, the bottom of the arc extinguishing grid base is provided with an arc extinguishing grid base long hole, the first and second arc extinguishing grid piece groups and the arc blocking piece are all installed in the arc extinguishing grid base, the arc extinguishing grid base is in the shape of a U-shaped groove, the bottom of the arc extinguishing grid base has the arc extinguishing grid base long hole, and the U-shaped opening at one end of the arc extinguishing grid base is matched in size with the moving contact, the end of the moving contact away from the circuit breaker transmission mechanism is located in the arc extinguishing grid base, the arc extinguishing grid base is fixedly installed on the stationary contact, and the stationary contact point is located in the arc extinguishing grid base long hole.

[0011] Preferably, the bottom of the arc extinguishing grid base is further provided with an arc extinguishing grid base mounting hole, the stationary contact is provided with a stationary contact mounting hole, and the arc extinguishing grid base and the stationary contact are installed in the circuit breaker through the same screw passing through the arc extinguishing grid base mounting hole and the stationary contact mounting hole.

[0012] Preferably, the first and second arc extinguishing grid pieces are arranged in a staggered manner with a spacing from bottom to top, a stationary contact point arc striking piece is welded on the first arc extinguishing grid piece at the bottom, the end of the stationary contact point arc striking piece is close to the stationary contact point and has a spacing with the stationary contact point, a moving contact point arc striking piece is welded on the second arc extinguishing grid piece at the top, and the moving contact is close to the moving contact point arc striking piece and has a spacing with the moving contact point arc striking piece.

[0013] Preferably, the first arc extinguishing grid piece is in the shape of a U-shaped plate with a long side, the bottom edge of the U-shaped groove of the first arc extinguishing grid piece has a first arc extinguishing grid piece arc cutting notch, the second arc extinguishing grid piece is in the shape of a square plate, one side of the second arc extinguishing grid piece has a second arc extinguishing grid piece arc cutting notch, and the moving contact is located in the U-shaped groove of the first arc extinguishing grid piece.

[0014] Preferably, the left and right arc blocking pieces are both provided with a plurality of first and second clamping grooves, the left and right sides of the first arc extinguishing grid piece are both provided with a first arc extinguishing grid piece clamping block, the left and right sides of the second arc extinguishing grid piece are both provided with a second arc extinguishing grid piece clamping block, the first arc extinguishing grid piece clamping block is installed in the first clamping groove, and the second arc extinguishing grid piece clamping block is installed in the second clamping groove.

[0015] Preferably, the first arc extinguishing grid piece arc cutting notch is in an irregular shape, the first arc extinguishing grid pieces in the first arc extinguishing grid piece group are arranged in a staggered manner in the order of front and back surfaces, and the edges of the first arc extinguishing grid piece arc cutting notches are all located on the same side.

[0016] Preferably, the arc extinguishing assembly further comprises arc limiting pieces, the arc limiting pieces comprise left and right arc limiting pieces arranged symmetrically, the left and right arc limiting pieces are respectively installed on the left and right sides of the U-shaped slot of the primary arc extinguishing grid, and the outer sides of the left and right arc limiting pieces are respectively provided with a primary arc extinguishing grid fixing slot, and the long edges of the primary arc extinguishing grid are installed in the primary arc extinguishing grid fixing slot; the outer sides of the left and right arc limiting pieces are respectively provided with a fixing block, the left and right arc limiting pieces are respectively provided with an arc limiting piece installation hole, and the fixing block is installed in the arc limiting piece installation hole. Due to the existence of the left and right arc limiting pieces, the freedom of the arc moving towards the inside of the circuit breaker is limited, so that the arc is guaranteed to move towards the primary arc extinguishing grid set and the secondary arc extinguishing grid set as much as possible.

[0017] Preferably, the arc extinguishing assembly further comprises a rear arc blocking plate, and the arc extinguishing grid base is provided with a rear arc blocking plate fixing slot away from the moving contact, and the rear arc blocking plate is installed in the rear arc blocking plate fixing slot.

[0018] Preferably, the top of the rear arc blocking plate is provided with a plurality of ventilation openings. The air flow and heat dissipation between the inside and outside of the arc extinguishing assembly are guaranteed, and due to the existence of the ventilation openings of the rear arc blocking plate, the arc is more quickly moved towards the arc extinguishing grid piece without a notch, and the arc extinguishing is accelerated.

[0019] The utility model has the following technical effects:

[0020] 1. After the arc is generated, the arc directly enters the primary arc extinguishing grid set, at the arc cutting notch of the primary arc extinguishing grid, the arc is cut by the primary arc extinguishing grid and then quickly enters the secondary arc extinguishing grid set and is cut again by the arc cutting notch of the secondary arc extinguishing grid, thereby forming a staged arc extinguishing, so that the arc extinguishing is accelerated and the arc extinguishing efficiency is improved. The staged arc extinguishing of the primary arc extinguishing grid set and the secondary arc extinguishing grid set improves the arc extinguishing effect; by arranging the primary arc extinguishing grid and the secondary arc extinguishing grid in different forms, the utilization rate of the primary arc extinguishing grid and the secondary arc extinguishing grid is improved, the arc extinguishing capacity of the circuit breaker is improved, and the maintenance cost of the circuit breaker is reduced.

[0021] 2. By arranging the primary arc extinguishing grid and the secondary arc extinguishing grid in an interlaced and spaced manner, the utilization rate of the arc extinguishing grid during arc extinguishing is improved, the arc splitting capacity of the arc extinguishing grid is improved, and the arc extinguishing speed is improved.

[0022] 3. The primary arc extinguishing grid is installed in the primary arc blocking piece first clamping groove through the primary arc extinguishing grid clamping block, and the secondary arc extinguishing grid is installed in the secondary arc blocking piece second clamping groove through the secondary arc extinguishing grid clamping block, so that the primary arc extinguishing grid set and the secondary arc extinguishing grid set are stably installed in the arc extinguishing grid base and can be quickly disassembled and replaced, and the utilization rate of the primary arc extinguishing grid and the secondary arc extinguishing grid is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1The utility model discloses an arc extinguishing device arc extinguishing system whole schematic diagram;

[0024] Figure 2 The utility model discloses an arc extinguishing device arc extinguishing grid base and rear arc baffle structure left to the axle side schematic diagram of omitting;

[0025] Figure 3 The utility model discloses an arc extinguishing device arc extinguishing grid base and rear arc baffle structure right to the axle side schematic diagram of omitting;

[0026] Figure 4 The utility model discloses an arc extinguishing device Figure 2 Omitting arc baffle piece structure schematic diagram;

[0027] Figure 5 The utility model discloses an arc extinguishing device Figure 3 Omitting arc baffle piece structure schematic diagram;

[0028] Figure 6 The utility model discloses an arc extinguishing device primary arc extinguishing grid piece group and secondary arc extinguishing grid piece group structure installation schematic diagram;

[0029] Figure 7 The utility model discloses an arc extinguishing device Figure 6 The utility model discloses an arc extinguishing device

[0030] Figure 8 The utility model discloses an arc extinguishing device Figure 6 The utility model discloses an arc extinguishing device

[0031] Figure 9 The utility model discloses an arc extinguishing device circuit breaker opening primary arc extinguishing grid piece group and secondary arc extinguishing grid piece group structure relative position schematic diagram;

[0032] Figure 10 The utility model discloses an arc extinguishing device circuit breaker closing primary arc extinguishing grid piece group and secondary arc extinguishing grid piece group structure relative position schematic diagram;

[0033] Figure 11 The utility model discloses an arc extinguishing device primary arc extinguishing grid piece and secondary arc extinguishing grid piece single piece structure schematic diagram;

[0034] Figure 12 The utility model discloses an arc extinguishing device primary arc extinguishing grid piece group, secondary arc extinguishing grid piece group and arc limiting piece relative position schematic diagram;

[0035] Figure 13 The utility model discloses an arc extinguishing device primary arc extinguishing grid piece group, secondary arc extinguishing grid piece group and arc limiting piece relative position right to the axle measurement schematic diagram;

[0036] Figure 14 The utility model discloses an arc extinguishing device arc extinguishing grid base and rear arc baffle structure schematic diagram;

[0037] Figure 15 It is the overhead structure schematic view of the arc extinguishing device arc extinguishing grid base and the rear arc baffle of the utility model.

[0038] Figure 16 It is the side structure schematic view of the arc extinguishing device arc extinguishing grid base and the rear arc baffle of the utility model.

[0039] Figure 17 It is the arc extinguishing device arc baffle structure schematic view of the utility model.

[0040] Figure 18 It is the first level arc extinguishing grid piece group and the second level arc extinguishing grid piece group layout schematic view of the arc extinguishing device of the utility model.

[0041] Figure 19 It is the overhead view of the arc extinguishing device moving contact, static contact, first level arc extinguishing grid piece group and second level arc extinguishing grid piece group assembly structure of the utility model.

[0042] Figure 20 It is the overhead view of the arc extinguishing device static contact, first level arc extinguishing grid piece group and second level arc extinguishing grid piece group assembly structure of the utility model.

[0043] In the drawing: 1, arc extinguishing assembly;2, static contact;3, moving contact;4, static contact arc starting piece;5, moving contact arc starting piece;6, left arc limiting piece;7, right arc limiting piece;8, left arc blocking piece;9, right arc blocking piece;10, first level arc extinguishing grid piece group;11, first level arc extinguishing grid piece arc cutting notch;12, first level arc extinguishing grid piece clamping block;13, second level arc extinguishing grid piece group;14, second level arc extinguishing grid piece arc cutting notch;15, second level arc extinguishing grid piece clamping block;16, first level clamping groove;17, second level clamping groove;18, first level arc extinguishing grid piece;19, second level arc extinguishing grid piece;20, arc limiting piece mounting hole;21, fixed block;22, moving contact;23, static contact;24, arc extinguishing grid base;25, rear arc baffle;26, static contact external copper bar hole;27, first level arc extinguishing grid fixed groove;28, arc extinguishing grid base long hole;29, rear arc baffle fixed groove;30, reinforcing rib;31, ventilation opening;32, arc extinguishing grid base mounting hole;33, moving contact matching hole;34, static contact mounting hole;35, heat dissipation hole. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical scheme and advantages of the utility model more clear, the utility model is specifically described below in combination with the drawings.

[0045] For example, Figures 1 to 6As shown, an arc extinguishing device with a multi-stage arc extinguishing grid group is installed in a circuit breaker, which comprises a moving contact 3 and a stationary contact 2, the moving contact 3 is provided with a moving contact matching hole 33 at one end to be connected with a circuit breaker transmission mechanism, the stationary contact 2 is fixedly connected with a circuit breaker base, and the circuit breaker transmission mechanism drives the moving contact 3 to move, and it further comprises an arc extinguishing assembly 1, the arc extinguishing assembly 1 comprises an arc blocking piece, a first-stage arc extinguishing grid group 10 and a second-stage arc extinguishing grid group 13 arranged in an interlaced manner, the arc blocking piece comprises a left arc blocking piece 8 and a right arc blocking piece 9 arranged in a left-right symmetrical manner, the first-stage arc extinguishing grid group 10 comprises a plurality of first-stage arc extinguishing grids 18 provided with first-stage arc extinguishing grid arc cutting notches 11, the second-stage arc extinguishing grid group 13 comprises a plurality of second-stage arc extinguishing grids 19 provided with second-stage arc extinguishing grid arc cutting notches 14, and the first-stage arc extinguishing grids 18 and the second-stage arc extinguishing grids 19 are arranged in an interlaced and spaced manner from bottom to top, as shown in Figures 4 to 6 As shown, the first-stage arc extinguishing grid group 10 and the second-stage arc extinguishing grid group 13 are installed on the arc blocking piece, and the first-stage arc extinguishing grid group 10, the second-stage arc extinguishing grid group 13 and the arc blocking piece jointly constitute an arc extinguishing chamber; the left arc blocking piece 8 and the right arc blocking piece 9 are respectively located on the left and right sides of the stationary contact 2; the moving contact 3 is provided with a moving contact point 22 at the end away from the circuit breaker transmission mechanism, the moving contact point 22 is located in the arc extinguishing chamber, and the first-stage arc extinguishing grid arc cutting notches 11 and the second-stage arc extinguishing grid arc cutting notches 14 are all located at the end close to the moving contact point 22; the stationary contact 2 is provided with a stationary contact point 23, and the moving contact point 22 and the stationary contact point 23 are separated in the opening state or in contact in the closing state; in the opening state, the moving contact 3 is away from the stationary contact point 23 and has a spacing with the moving contact arc generating piece 5; in the closing state, the moving contact point 22 is in contact with the stationary contact point 23.

[0046] After the arc is generated, the arc directly enters the first-stage arc extinguishing grid group 10, moves along the notch at the first-stage arc extinguishing grid arc cutting notch 11, is cut by the first-stage arc extinguishing grid 18, and then quickly enters the second-stage arc extinguishing grid group 13 to be cut again by the second-stage arc extinguishing grid arc cutting notch 14, thereby forming a staged arc extinguishing to accelerate the arc extinguishing and improve the arc extinguishing efficiency. Through the staged arc extinguishing of the first-stage arc extinguishing grid group 10 and the second-stage arc extinguishing grid group 13, the arc extinguishing effect is improved; by setting the first-stage arc extinguishing grid 18 and the second-stage arc extinguishing grid 19 in different forms, the utilization rate of the first-stage arc extinguishing grid 18 and the second-stage arc extinguishing grid 19 is improved, the arc extinguishing capacity of the circuit breaker is improved, and the maintenance cost of the circuit breaker is reduced.

[0047] Through the interlaced and spaced arrangement between the first-stage arc extinguishing grid 18 and the second-stage arc extinguishing grid 19, the utilization rate of the arc extinguishing grid in the arc extinguishing is improved, the arc splitting capacity of the arc extinguishing grid is improved, and the arc extinguishing speed is improved.

[0048] The arc extinguishing assembly 1 further comprises an arc extinguishing grid base 24, the bottom of which is provided with an arc extinguishing grid base long hole 28, the first arc extinguishing grid piece group 10, the second arc extinguishing grid piece group 13 and the arc blocking piece are all installed in the arc extinguishing grid base 24, the arc extinguishing grid base 24 is in the shape of a U-shaped groove, the bottom of which has the arc extinguishing grid base long hole 28, and the size of the U-shaped opening at one end of the arc extinguishing grid base 24 matches the size of the moving contact 3, the end of the moving contact 3 away from the circuit breaker transmission mechanism is located in the arc extinguishing grid base 24, the arc extinguishing grid base 24 is fixedly installed on the stationary contact 2, and the stationary contact point 23 is located in the arc extinguishing grid base long hole 28.

[0049] As shown in Figures 14 to 16 , the bottom of the arc extinguishing grid base 24 is further provided with an arc extinguishing grid base mounting hole 32, the stationary contact 2 is provided with a stationary contact mounting hole 34, and the arc extinguishing grid base 24 and the stationary contact 2 are installed in the circuit breaker through the same screw passing through the arc extinguishing grid base mounting hole 32 and the stationary contact mounting hole 34.

[0050] As shown in Figures 7 to 10 , the first arc extinguishing grid piece 18 and the second arc extinguishing grid piece 19 are arranged in a staggered manner with a spacing from bottom to top, and the stationary contact point arc striking piece 4 is welded on the first arc extinguishing grid piece 18 at the bottom, the end of the stationary contact point arc striking piece 4 is close to the stationary contact point 23 and has a spacing with the stationary contact point 23, the moving contact point arc striking piece 5 is welded on the second arc extinguishing grid piece 19 at the top, and the moving contact 3 is close to the moving contact point arc striking piece 5 and has a spacing with the moving contact point arc striking piece 5 in the open state.

[0051] As shown in Figure 11 , Figure 18 , the first arc extinguishing grid piece 18 is in the shape of a U-shaped plate with a long side, and the bottom edge of the U-shaped groove has a first arc extinguishing grid piece arc cutting notch 11, the second arc extinguishing grid piece 19 is in the shape of a square plate, and one side of the second arc extinguishing grid piece has a second arc extinguishing grid piece arc cutting notch 14, and the moving contact 3 is located in the U-shaped groove of the first arc extinguishing grid piece 18.

[0052] As shown in Figure 17As shown, the left arc blocking piece 8 and the right arc blocking piece 9 are each provided with a plurality of first clamping grooves 16 and second clamping grooves 17, the first arc extinguishing fin 18 is provided with a first arc extinguishing fin clamping block 12 on each of the left and right sides, the second arc extinguishing fin 19 is provided with a second arc extinguishing fin clamping block 15 on each of the left and right sides, the first arc extinguishing fin clamping block 12 is installed in the first clamping groove 16, and the second arc extinguishing fin clamping block 15 is installed in the second clamping groove 17. The first arc extinguishing fin 18 is installed in the first clamping groove 16 of the arc blocking piece through the first arc extinguishing fin clamping block 12, and the second arc extinguishing fin 19 is installed in the second clamping groove 17 of the arc blocking piece through the second arc extinguishing fin clamping block 15, so as to ensure that the first arc extinguishing fin group 10 and the second arc extinguishing fin group 13 are stably installed in the arc extinguishing fin base 24 while being capable of being quickly disassembled and replaced, thereby improving the utilization rate of the first arc extinguishing fin 18 and the second arc extinguishing fin 19.

[0053] As shown in Figure 18 , the first arc extinguishing fin cutting arc notch 11 is irregular, the adjacent first arc extinguishing fins 18 in the first arc extinguishing fin group 10 are sequentially staggered in the order of front and back surfaces, and the edges of the first arc extinguishing fin cutting arc notch 11 are all located on the same side, thereby enhancing the arc cutting effect.

[0054] As shown in Figure 12 , Figure 13 , the arc extinguishing assembly 1 further comprises arc limiting pieces, the arc limiting pieces comprise left and right symmetrically arranged left arc limiting pieces 6 and right arc limiting pieces 7, the left arc limiting pieces 6 and the right arc limiting pieces 7 are respectively installed on the left and right sides in the U-shaped groove of the first arc extinguishing fin 18, and the outer sides of the left arc limiting pieces 6 and the right arc limiting pieces 7 are each provided with a first arc extinguishing fin fixing groove 27, and the long edges of the first arc extinguishing fin 18 are each installed in the first arc extinguishing fin fixing groove 27; the outer sides of the left arc limiting pieces 6 and the right arc limiting pieces 7 are each provided with a fixing block 21, the left arc blocking piece 8 and the right arc blocking piece 9 are each provided with an arc limiting piece mounting hole 20, and the fixing block 21 is installed in the arc limiting piece mounting hole 20. Due to the existence of the left arc limiting piece 6 and the right arc limiting piece 7, the freedom of movement of the electric arc towards the inside of the circuit breaker is limited, so as to ensure that the electric arc moves towards the first arc extinguishing fin group 10 and the second arc extinguishing fin group 13 as much as possible.

[0055] As shown in Figure 14 , the arc extinguishing assembly 1 further comprises a rear arc blocking plate 25, and the arc extinguishing fin base 24 is provided with a rear arc blocking plate fixing groove 29 at the end away from the movable contact 3, and the rear arc blocking plate 25 is installed in the rear arc blocking plate fixing groove 29.

[0056] As shown in Figure 16 , the top of the rear arc blocking plate 25 is provided with a plurality of ventilation openings 31. The air flow and heat dissipation between the inside and outside of the arc extinguishing assembly 1 are ensured, and due to the existence of the ventilation openings 31 of the rear arc blocking plate 25, the electric arc will move faster towards the direction of the arc extinguishing fin without the cutting notch, thereby accelerating the extinguishing of the electric arc.

[0057] AsFigure 14 As shown, the outer surface of the arc-extinguishing grid base 24 is provided with several reinforcing ribs 30. The reinforcing ribs 30 ensure structural strength and increase stability.

[0058] like Figure 2 As shown, the stationary contact 2 is also provided with a stationary contact external copper busbar hole 26 for easy connection of an external copper busbar.

[0059] like Figure 9 As shown, the moving contact 3 is also provided with heat dissipation holes 35 to facilitate heat dissipation from the moving contact.

[0060] The arc-limiting component near the moving contact 3 system uses a special solid gas-generating material, mainly a lithium-rich compound. When an electric arc is generated, it will rapidly vaporize under high temperature, generate gas, and quickly diffuse, accelerating the movement and extinguishing of the electric arc.

[0061] The primary arc-extinguishing grid assembly 10 and the secondary arc-extinguishing grid assembly 13 are made of metal materials, such as aluminum alloy and alloy steel; the arc-blocking component and the rear arc-blocking plate 25 are made of arc-resistant BMC molding compound, epoxy resin and other materials.

[0062] To ensure the stability of the moving contact 22 and the stationary contact 23 during operation, the moving contact 22 and the stationary contact 23 are made of materials that are not easily corroded by electrolytic corrosion, such as copper plated with silver.

[0063] The moving contact arc ignition element 5 and the stationary contact arc ignition element 4 are made of metal materials such as iron or new plastic materials such as polyoxymethylene. The new plastics have higher stability and will only decompose when the burning temperature reaches 960℃.

[0064] The installation sequence of an arc-extinguishing device with a multi-stage arc-extinguishing grid assembly is as follows:

[0065] like Figure 19 , Figure 20 As shown, firstly, the stationary contact 2 and the arc-extinguishing grid base 24 are fixedly installed on the circuit breaker using the same screw passing through the arc-extinguishing grid base mounting hole 32 and the stationary contact mounting hole 34. Next, the moving contact 3 is engaged with the circuit breaker transmission mechanism through the moving contact mating hole 33, and the circuit breaker transmission mechanism drives the moving contact 3 to rotate, causing the moving contact 3 to fall into the arc-extinguishing grid base 24. Then, the primary arc-extinguishing grid plate 18 and the secondary arc-extinguishing grid plate 19 are arranged alternately from bottom to top in the left arc-blocking member 8 and the right arc-blocking member 9. Next, the left arc-limiting member 6 and the right arc-limiting member 7 are installed in the primary arc-extinguishing grid plate group 10. Then, the entire assembly of the primary arc-extinguishing grid plate group 10, the secondary arc-extinguishing grid plate group 13, the arc-blocking member, and the arc-limiting member is installed in the arc-extinguishing grid base 24 by directly inserting it into the arc-extinguishing grid base 24. Finally, the rear arc-blocking plate 25 is installed on the arc-extinguishing grid base 24, thus completing the assembly.

[0066] The above-described embodiments are merely preferred modes of the present application, and are not intended to limit the scope of the present application, and various modifications and improvements to the technical solutions of the present application made by those of ordinary skill in the art without departing from the design spirit of the present application shall fall within the protection scope of the present application as defined by the claims.

Claims

1. An arc extinguishing device with multi-stage arc extinguishing grid piece group, installed in a circuit breaker, comprising a moving contact and a stationary contact, the moving contact is provided with a moving contact matching hole at one end to connect with a circuit breaker transmission mechanism, the stationary contact is fixedly connected with a circuit breaker base, and the circuit breaker transmission mechanism drives the moving contact to move, characterized in that, It also includes arc-extinguishing assembly, the arc-extiguishing assembly includes arc baffle, primary arc-extinguishing grid group and secondary arc-extinguishing grid group, the arc baffle includes left arc baffle and right arc baffle, the primary arc-extinguishing grid group includes a plurality of primary arc-extinguishing grid with primary arc-extinguishing grid arc cut, the secondary arc-extinguishing grid group includes a plurality of secondary arc-extinguishing grid with secondary arc-extinguishing grid arc cut, the primary arc-extinguishing grid and secondary arc-extinguishing grid are sequentially staggered and spaced from bottom to top, the primary arc-extinguishing grid group and secondary arc-extinguishing grid group are installed on the arc baffle, and the primary arc-extinguishing grid group, secondary arc-extinguishing grid group and arc baffle form arc-extinguishing chamber together;The left arc baffle and right arc baffle are respectively located on the left and right sides of the static contact;The moving contact is provided with a moving contact point at the end away from the circuit breaker transmission mechanism, and the moving contact point is located in the arc-extinguishing chamber, the primary arc-extinguishing grid arc cut and secondary arc-extinguishing grid arc cut are located at the end close to the moving contact point;The static contact is provided with a static contact point, and the moving contact point and the static contact point are separated in the open state or contacted in the closed state;In the open state, the moving contact is away from the static contact, and has a spacing with the moving contact arc piece;In the closed state, the moving contact point contacts the static contact point.

2. An arc chute according to claim 1 having a plurality of arc chute plate sets, characterized in that: The arc-extinguishing assembly further includes arc-extinguishing grid base, the arc-extinguishing grid base is provided with arc-extinguishing grid base long hole in the bottom, the primary arc-extinguishing grid group, secondary arc-extinguishing grid group and arc baffle are all installed in the arc-extinguishing grid base, the arc-extinguishing grid base is U-shaped groove, the bottom has arc-extinguishing grid base long hole, and the U-shaped opening at one end is matched with the size of the moving contact, the end of the moving contact away from the circuit breaker transmission mechanism is located in the arc-extinguishing grid base, the arc-extinguishing grid base is fixedly installed on the static contact, and the static contact point is located in the arc-extinguishing grid base long hole.

3. An arc chute according to claim 2, wherein: The bottom of the arc-extinguishing grid base is also provided with arc-extinguishing grid base mounting hole, the static contact is provided with static contact mounting hole, and the arc-extinguishing grid base and the static contact are installed in the circuit breaker through the same screw passing through the arc-extinguishing grid base mounting hole and the static contact mounting hole.

4. An arc chute according to claim 1 having a plurality of arc chute segments, characterized in that: The primary arc-extinguishing grid and secondary arc-extinguishing grid are sequentially staggered and spaced from bottom to top, and the static contact arc piece is welded on the primary arc-extinguishing grid at the bottom, the end of the static contact arc piece is close to the static contact point, and has a spacing with the static contact point;The moving contact arc piece is welded on the secondary arc-extinguishing grid at the top;In the open state, the moving contact is close to the moving contact arc piece, and has a spacing with the moving contact arc piece.

5. An arc chute according to claim 1 having a plurality of arc chute segments, wherein: The primary arc-extinguishing grid is U-shaped plate with long side, and the U-shaped groove has primary arc-extinguishing grid arc cut, the secondary arc-extinguishing grid is square plate, and one side has secondary arc-extinguishing grid arc cut, and the moving contact is located in the U-shaped groove of the primary arc-extinguishing grid.

6. An arc chute having a plurality of arc chute vane sets according to claim 1, wherein: The left arc baffle and right arc baffle are provided with a plurality of primary card slot and secondary card slot, the left and right sides of the primary arc-extinguishing grid are provided with primary arc-extinguishing grid card block, the left and right sides of the secondary arc-extinguishing grid are provided with secondary arc-extinguishing grid card block, the primary arc-extinguishing grid card block is installed in the primary card slot, and the secondary arc-extinguishing grid card block is installed in the secondary card slot.

7. An arc-hunting device having a plurality of arc-hunting blade sets according to claim 1, characterized in that: The arc cutting notch of the primary arc extinguishing grid sheet is irregular, adjacent primary arc extinguishing grid sheets in the primary arc extinguishing grid sheet group are arranged in turn in the order of front and back surfaces and have edges of the arc cutting notch located on the same side.

8. An arc chute having a plurality of arc chute plate sets according to claim 1, wherein: The arc extinguishing assembly further comprises arc limiting pieces, the arc limiting pieces comprise left and right arc limiting pieces symmetrically arranged, the left and right arc limiting pieces are respectively installed on the left and right sides in the U-shaped groove of the primary arc extinguishing grid, and outer sides of the left and right arc limiting pieces are respectively provided with primary arc extinguishing grid fixing grooves, long edges of the primary arc extinguishing grid are installed in the primary arc extinguishing grid fixing grooves; the outer sides of the left and right arc limiting pieces are respectively provided with fixing blocks, and the left and right arc limiting pieces are respectively provided with arc limiting piece installation holes, and the fixing blocks are installed in the arc limiting piece installation holes.

9. An arc chute having a plurality of arc chute vane sets according to claim 2, wherein: The arc extinguishing assembly further comprises a rear arc blocking plate, and the arc extinguishing grid base is provided with a rear arc blocking plate fixing groove at an end away from the movable contact, and the rear arc blocking plate is installed in the rear arc blocking plate fixing groove.

10. An arc chute having a plurality of arc chute vane sets according to claim 9, wherein: The top of the rear arc blocking plate is provided with a plurality of ventilation openings.

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