Circuit breaker
By setting up ∩-shaped arc-induced parts and exhaust holes in the circuit breaker, the magnetic blowing force in the middle part of the arc extinguishing chamber is enhanced, and the problem that the arc is difficult to quickly enter the arc extinguishing chamber is solved, and the utilization rate of the arc extinguishing grid and the breaking ability of the circuit breaker are improved.
Patent Information
- Application Number
- CN202422176961.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-05
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-09-05
AI Technical Summary
When existing circuit breakers cut off high voltage, it is difficult for the arc to quickly enter the arc extinguishing chamber, resulting in low utilization of arc extinguishing grids and cannot be completely extinguished, which may damage the equipment.
A circuit breaker is designed, including the first and second arc extinguishing chambers arranged relatively, each arc extinguishing chamber has a stacked arc extinguishing grid, and a ∩-shaped arc initiator is provided between them to enhance the magnetic blowing force in the middle part of the arc extinguishing chamber, accelerate the arc transfer to the arc extinguishing chamber through the arc extinguishing member, and a vent hole is provided at the connecting portion of the grid.
It significantly improves the transfer speed of the arc and the utilization rate of the arc-extinguishing grid, enhances the breaking ability of the circuit breaker, and avoids damage to the equipment by the arc.
Smart Images
Figure CN223066108U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of low-voltage electrical appliances, and in particular relates to a circuit breaker. Background Art
[0002] When the circuit breaker is disconnected, the initial distance between the moving contact and the static contact is small, and the electric field strength is high.
[0003] An arc will be generated between the contacts. If the arc is not extinguished, the circuit cannot be completely disconnected. In addition, the temperature of the arc is very high. The high-temperature arc will burn the equipment and cause serious accidents. As the voltage level of the circuit breaker increases, the arc generated inside the circuit breaker also increases. In order to avoid the arc from affecting the internal structure of the circuit breaker, it is necessary to extinguish the arc in time. However, the length of the arc extinguishing grid is often limited by the volume of the circuit breaker. In the process of breaking the short-circuit circuit, the breaking energy is still relatively large. The arc extinguishing capacity of the shorter arc extinguishing grid is insufficient, so that the arc may not be completely extinguished after passing through the arc extinguishing chamber. Therefore, it is necessary to increase the width of the arc extinguishing chamber and increase the number of arc extinguishing grids so that the arc can be fully cooled and divided. However, as the width of the arc extinguishing chamber increases, the arc magnetic blowing force in the middle part of the arc extinguishing chamber is weakened, and the arc cannot quickly enter the arc extinguishing chamber, which will cause the arc to be unable to be completely extinguished, causing damage to the internal structure of the circuit breaker.
[0004] In view of the above-mentioned existing technologies, it is necessary to make reasonable improvements. The technical solution to be introduced below is produced in this context. Utility Model Content
[0005] The utility model aims to provide a circuit breaker which can effectively accelerate the speed of arc transfer from the contact to the arc extinguishing chamber and improve the utilization rate of the arc extinguishing grid to improve the breaking capacity.
[0006] The purpose of the utility model is achieved in this way. A circuit breaker includes a moving and static contact pair and an arc extinguishing device corresponding to the moving and static contact pair, the arc extinguishing device includes a first arc extinguishing chamber and a second arc extinguishing chamber arranged opposite to each other, the first arc extinguishing chamber includes a group of first arc extinguishing grids, the second arc extinguishing chamber includes a group of second arc extinguishing grids, an arc-striking member is further provided between the first arc extinguishing chamber and the second arc extinguishing chamber, the arc-striking member includes a first arc-striking grid arranged on the right side of the first arc extinguishing grid and arranged in a ∩ shape, and a second arc-striking grid close to the left side of the second arc extinguishing grid and also arranged in a ∩ shape, the bottoms of the first arc-striking grid and the second arc-striking grid are connected by a grid connecting portion.
[0007] In one embodiment of the utility model, a plurality of exhaust holes for exhausting the arc extinguishing chamber are arranged on the grid connecting portion, and the exhaust holes are in the shape of square holes, round holes or waist-shaped holes.
[0008] In another embodiment of the present utility model, the circuit breaker further includes a housing. An arc extinguishing device cavity is provided inside the housing, and two exhaust ports are provided on the side wall of the arc extinguishing device cavity. One of the two exhaust ports is located on the side of the first arc extinguishing chamber away from the second arc extinguishing chamber, and the other of the two exhaust ports is located on the side of the second arc extinguishing chamber away from the first arc extinguishing chamber.
[0009] Since an arc guiding member is provided between the first arc extinguishing chamber and the second arc extinguishing chamber in the present utility model, and the arc guiding grids on the arc guiding member are designed in a ∩ shape, the magnetic blow force of the arc in the middle part of the arc extinguishing chamber is significantly enhanced, the arc is quickly transferred to the inside of the arc extinguishing chamber, the utilization rate of the arc extinguishing grids is improved, and thus the breaking capacity of the circuit breaker is improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 is a schematic diagram of the inside of the circuit breaker housing of the present utility model, including moving and static contacts and an arc extinguishing device;
[0011] Figure 2 is a perspective view of the cooperation between the moving and static contacts and the arc extinguishing device of the present utility model;
[0012] Figure 3 is a schematic diagram of the cooperation between the moving contact, the insulating side plate, the first arc extinguishing grid and the arc guiding member of the present utility model;
[0013] Figure 4 is a perspective view of the arc guiding member of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0014] The following will describe in detail the specific embodiments of the present utility model in conjunction with the drawings. However, the description of the embodiments is not a limitation of the technical solution. Any change in form rather than substance based on the concept of the present utility model should be regarded as the protection scope of the present utility model.
[0015] In the following description, the directional (or positional) concepts of up, down, left, right, front and back are all in reference to the position state of the figure being described, aiming to facilitate public understanding. Therefore, they cannot be construed as special limitations on the technical solution provided by the present utility model.
[0016] Please refer to Figures 1 to 4 , the circuit breaker includes a moving and static contact pair 1, an arc extinguishing device 2, an operating mechanism, a tripping device, and a housing 4 for accommodating the above components. The moving and static contact pair 1 includes a moving contact 11 and a static contact 12. In this embodiment, Figure 1In the height direction of the circuit breaker shown, the operating mechanism and the tripping mechanism are arranged at the upper part of the inner cavity of the housing 4. One end of the moving contact 11 is located at the upper part of the inner cavity of the housing and is connected to the operating mechanism. The other end of the moving contact 11 extends into the lower part of the housing cavity. The moving contact on the moving contact 11 cooperates with the static contact also located in the lower part of the housing cavity. The separation and closing of the moving and static contact pair 1 realize the disconnection and connection of the circuit. The lower part of the inner cavity of the housing constitutes an arc extinguishing device cavity 41 for accommodating the arc extinguishing device 2. The arc extinguishing device 2 is arranged corresponding to the moving and static contact pair 1 and is used to extinguish the arc generated between the moving and static contacts when the moving and static contact pair separates.
[0017] The arc extinguishing device 2 includes a first arc extinguishing chamber 21 and a second arc extinguishing chamber 22 arranged oppositely. In this embodiment, as Figure 1 , 2 , the first arc extinguishing chamber 21 is located at the left end of the arc extinguishing device cavity 41, and the second arc extinguishing chamber 22 is located at the right end of the arc extinguishing device cavity 41. It can be seen that the first arc extinguishing chamber 21 and the second arc extinguishing chamber 22 are arranged along the movement direction of the moving contact 11 in the moving and static contact pair 1, which can be understood as Figure 1 the width direction of the circuit breaker shown. The first arc extinguishing chamber 21 has a group of first arc extinguishing grid sheets 211 arranged in layers. This group of first arc extinguishing grid sheets 211 is offset relative to the perpendicular line perpendicular to the bottom wall 411 of the arc extinguishing device cavity 41. In this embodiment, it deflects clockwise relative to the perpendicular line, and the deflection angles of each first arc extinguishing grid sheet 211 are the same; the second arc extinguishing chamber 22 has a group of second arc extinguishing grid sheets 221 arranged in layers. This group of second arc extinguishing grid sheets 221 is offset relative to the perpendicular line perpendicular to the bottom wall 411 of the arc extinguishing device cavity 41. In this embodiment, it deflects counterclockwise relative to the perpendicular line, and the deflection angles of each second arc extinguishing grid sheet 221 are the same. The offset directions of the above-mentioned first arc extinguishing grid sheets 211 and second arc extinguishing grid sheets 221 are opposite. Preferably, the number of the second arc extinguishing grid sheets 221 corresponding to the lower part of the static contact 12 as described in Figure 1 is more than the number of the first arc extinguishing grid sheets 211 corresponding to the lower part of the moving contact 11.
[0018] An arc guiding member 3 is also provided between the first arc extinguishing chamber 21 and the second arc extinguishing chamber 22. The arc guiding member 3 has a first arc guiding grid sheet 31 on the side close to the first arc extinguishing grid sheet 211 and a second arc guiding grid sheet 32 on the side close to the second arc extinguishing grid sheet 221. The bottoms of the first arc guiding grid sheet 31 and the second arc guiding grid sheet 32 are connected by a grid sheet connecting portion 33. The first arc guiding grid sheet 31 and the first arc extinguishing grid sheet 211 have the same offset angle, and the second arc guiding grid sheet 32 and the second arc extinguishing grid sheet 221 have the same offset angle; from Figure 1 and in combination with Figure 3As shown, the first arcing grid piece 31, the grid piece connection part 33, and the second arcing grid piece 32 are arranged in sequence on a perpendicular line (i.e., the direction perpendicular to the paper surface) to the plane swept by the movement of the moving contact 11 of the moving and static contact pair 1. In this embodiment, the first arcing grid piece 31 is in a ∩ shape, that is, it is arranged in a ∩ shape on the right side of the first arc extinguishing grid piece 221, that is, on the left side of the grid piece connection part 33. Its biasing direction and biasing angle are the same as those of the first arc extinguishing grid piece 211. Further, the spacing distances between multiple stacked first arc extinguishing grid pieces 211 and between the first arc extinguishing grid piece 211 and the first arcing grid piece 31 are the same; the second arcing grid piece 32 is in a ∩ shape, that is, it is arranged in a ∩ shape on the left side of the second arc extinguishing grid piece 221, that is, on the right side of the grid piece connection part 33. Its biasing direction and biasing angle are the same as those of the second arc extinguishing grid piece 221. Further, the spacing distances between multiple stacked second arc extinguishing grid pieces 221 and between the second arc extinguishing grid piece 221 and the second arcing grid piece 32 are the same. The first arcing grid piece 31 and the second arcing grid piece 32 are arranged in a ∩ shape (i.e., in a ∩ type arrangement), which can increase the arc magnetic blowing force in the middle part of the arc extinguishing chamber and is beneficial to the arc quickly entering the arc extinguishing chamber for arc extinguishing.
[0019] On the grid piece connection part 33 of the arcing member 3 of the present utility model, a plurality of exhaust holes 331 for exhausting gas from the arc extinguishing chamber are further provided. The gas generated when the circuit breaker is tripped can be discharged from the arc extinguishing device through the exhaust holes 331. The exhaust holes 331 can be square holes, round holes, waist-shaped holes, etc. In this embodiment, round holes are preferably used.
[0020] The circuit breaker of the present utility model further includes a pair of insulating side plates 5. The pair of insulating side plates 5 are respectively arranged on both sides of the moving and static contact pair 1 and cover the arcing area 6 (the area where an arc is generated between the moving and static contacts) and the arc running area 7 (the area where the arc moves from the generation towards the first arc extinguishing grid piece 211 and the second arc extinguishing grid piece 221 of the arc extinguishing device). Figure 1 Combined Figure 2 It can be seen that in this embodiment, the edge of each insulating side plate 5 far from the moving and static contact pair 1 extends to the end of the cutting part on the first arc extinguishing grid piece 211 and the second arc extinguishing grid piece 221. At the same time, its edge far from the moving and static contact pair 1 constitutes an insulating member covering the arcing member 3, and isolates the arcing member 3 on this side from the moving and static contact pair 1. Thus, Figure 3A pair of insulating side plates 5 form narrow slits 50 on both sides of the moving and static contact pair 1 to accelerate the movement of the arc to the arc extinguishing chamber by utilizing the gas blowing effect. Furthermore, the gas-generating material can be covered on the mutually facing surfaces of the pair of insulating side plates. It is also possible to respectively arrange magnetic conductive plates on the outer sides of the pair of insulating plates 5, or embed magnetic conductive plates inside the insulating plates 5 (i.e., arrange magnetic conductive plates on both sides of the moving and static contact pair 1, and then use insulating materials to cover the magnetic conductive plates as a whole) so as to further superimpose the magnetic blowing effect to accelerate the movement of the arc to the arc extinguishing chamber. A fixing plate 23 for fixing a plurality of first arc extinguishing grids is provided on both sides of the first arc extinguishing grid 211, and a fixing plate is also provided on both sides of the second arc extinguishing grid 221. Of course, the fixing plate of the first arc extinguishing grid 211 and the fixing plate of the second arc extinguishing grid on the same side can be integrally formed by a fixing plate. The integrally formed fixing plate can simultaneously fix the first arc extinguishing grid 211, the arc-starting member 3 and one side of the second arc extinguishing grid 221. Furthermore, the insulating side plate 5 and the fixing plate can also be integrally formed.
[0021] The circuit breaker of the utility model is also provided with a moving contact arcing piece 13 and a stationary contact arcing piece 14. The moving contact arcing piece 13 is arranged close to the moving contact when the circuit breaker is opened, and its end extends to the left side of the first arc extinguishing chamber 21. The stationary contact arcing piece 14 is connected to the stationary contact 12 and extends to the right side of the second arc extinguishing chamber 22.
[0022] Two exhaust ports 412 are provided on the side wall of the arc extinguishing device chamber 41 of the circuit breaker of the present invention. Figure 1 One of the two exhaust ports 412 is located on the side of the first arc extinguishing chamber 21 away from the second arc extinguishing chamber 22, and the other of the two exhaust ports 412 is located on the side of the second arc extinguishing chamber 22 away from the first arc extinguishing chamber 21. An anti-ionization device 8 is provided between the first arc extinguishing chamber 21 and the exhaust port 412 on the corresponding side, and similarly, an anti-ionization device 8 is provided between the second arc extinguishing chamber 22 and the exhaust port 412 on the corresponding side.
[0023] When a fault current is generated in the circuit, the moving contact 11 and the stationary contact 12 are separated, and an arc is generated between the moving contact and the stationary contact. Under the action of air blowing and magnetic blowing, the arc moves in the arc running area 7, and the arc root on the stationary contact moves along the stationary contact arc-starting piece 14. The arc root on the moving contact jumps from the arc angle at the end of the moving contact to the moving contact arc-starting piece 13, and the middle part of the arc is connected by the arc-starting member 3. Since the bottom of the first arc-starting grid 31 and the second arc-starting grid 32 are connected by the connecting portion 33, the first arc-starting grid 31 and the second arc-starting grid 32 are disconnected, that is, the arc can be easily divided into two sections at the beginning of the arc connection, and then the two sections of the arc are respectively introduced into the first arc-extinguishing chamber 21 and the second arc-extinguishing chamber 22 through the first arc-starting grid 31 close to the first arc-extinguishing chamber 21 and the second arc-starting grid 32 close to the second arc-extinguishing chamber 22, as shown in FIG. Figure 1After the left - segment arc entering the first arc - extinguishing chamber 21 is cut by the first arc - extinguishing grid 211, it is stretched and cooled. The high - temperature metal gas formed by the arc is deionized by the deionization device 8 on the left side and further cooled, and then discharged outside the circuit breaker through the exhaust port 412 on the left side; the right - segment arc entering the second arc - extinguishing chamber 22 is cut by the second arc - extinguishing grid 221, stretched and cooled. The high - temperature metal gas formed by the arc is deionized by the deionization device 8 on the right side and further cooled, and then discharged outside the circuit breaker through the exhaust port 412 on the right side.
[0024] In the above - mentioned embodiment, the first arc - extinguishing grid 211 is deflected clockwise with respect to the perpendicular line to the bottom wall 411 of the arc - extinguishing device cavity 41, and the deflection angle is an acute angle. Similarly, the second arc - extinguishing grid 221 is deflected counter - clockwise with respect to the perpendicular line to the bottom wall 411 of the arc - extinguishing device cavity 41, and the deflection angle is also an acute angle. Of course, the circuit breaker of the present utility model is not limited to the above - mentioned embodiment. It can also be that the first arc - extinguishing grid 211 is deflected clockwise by 90° with respect to the perpendicular line to the bottom wall 411 of the arc - extinguishing device cavity 41, and at the same time, the second arc - extinguishing grid 221 is deflected counter - clockwise by 90° with respect to the perpendicular line to the bottom wall 411 of the arc - extinguishing device cavity 41, that is, two groups of arc - extinguishing grid groups are formed by laminating multiple grids in the height direction (borrowing Figure 1 the perspective) of the circuit breaker. The two groups of arc - extinguishing grid groups are arranged facing each other, that is, face - to - face. The arc - leading member 3 is arranged between the two groups of grids, that is, between the two arc - extinguishing chambers. Its first arc - leading grid 31 and second arc - leading grid 32 are arranged in an inverted ∩ shape, that is, in an inverted ∩ type. In this structure, the exhaust port is Figure 1 set on the side wall in the same way. It can also be that the second arc - extinguishing grid 221 is deflected counter - clockwise by 90° with respect to the perpendicular line to the bottom wall 411 of the arc - extinguishing device cavity 41, while the first arc - extinguishing grid 211 is deflected counter - clockwise by an acute angle with respect to the perpendicular line to the bottom wall 411 of the arc - extinguishing device cavity 41. The arc - leading member 3 is arranged between the two arc - extinguishing chambers. Its first arc - leading grid 31 and second arc - leading grid 32 are arranged in an inverted ∩ shape, that is, in an inverted ∩ type. In this structure, the exhaust port is set on the right - hand side wall. It can also be that the grids in one arc - extinguishing chamber are offset with respect to the perpendicular line to the bottom wall 411 of the arc - extinguishing device cavity 41, while the grids in the other arc - extinguishing chamber are not offset, that is, between multiple grids, along the width of the circuit breaker (borrowing Figure 1Stacked in the direction of the perspective). Therefore, the first arc extinguishing grid piece 211 and the second arc extinguishing grid piece 221 of the present utility model may have different biasing directions, the biasing angles between the grid pieces and the spacing distances between the grid pieces may also be different. The arc igniting member 3 is arranged between the first arc extinguishing chamber 21 and the second arc extinguishing chamber 22, and it has a first arc igniting grid piece 31, a connecting portion 33 and a second arc igniting grid piece 32. Preferably, the deflection angle of the first arc igniting grid piece 31 close to the first arc extinguishing grid piece 211 is the same as or close to that of the first arc extinguishing grid piece 211, and the deflection angle of the second arc igniting grid piece 32 close to the second arc extinguishing grid piece 221 is the same as or close to that of the second arc extinguishing grid piece 221.
Claims
1. A circuit breaker, comprising a moving and static contact pair (1) and an arc extinguishing device (2) arranged corresponding to the moving and static contact pair (1), the arc extinguishing device (2) comprising a first arc extinguishing chamber (21) and a second arc extinguishing chamber (22) arranged opposite to each other, the first arc extinguishing chamber (21) comprising a set of first arc extinguishing grid plates (211), the second arc extinguishing chamber (22) comprising a set of second arc extinguishing grid plates (221), characterized in that: An arcing component (3) is further provided between the first arc extinguishing chamber (21) and the second arc extinguishing chamber (22). The arcing component (3) includes a first arcing grid plate (31) which is arranged on the right side of the first arc extinguishing grid plate (211) and is in a ∩ shape, and a second arcing grid plate (32) which is close to the left side of the second arc extinguishing grid plate (221) and is also in a ∩ shape. The bottoms of the first arcing grid plate (31) and the second arcing grid plate (32) are connected by a grid plate connecting part (33).
2. The circuit breaker according to claim 1, wherein: A plurality of exhaust holes (331) for exhausting air from the arc extinguishing chamber are arranged on the grid plate connecting part (33). The exhaust holes (331) are in the shape of square holes, round holes or kidney-shaped holes.
3. The circuit breaker according to claim 1, characterized in that: The circuit breaker further includes a housing (4). An arc extinguishing device cavity (41) is arranged inside the housing (4). Two exhaust ports (412) are arranged on the side wall of the arc extinguishing device cavity (41). One of the two exhaust ports (412) is located on the side of the first arc extinguishing chamber (21) away from the second arc extinguishing chamber (22), and the other of the two exhaust ports (412) is located on the side of the second arc extinguishing chamber (22) away from the first arc extinguishing chamber (21).