Circuit breaker arc extinguish chamber and circuit breaker
By designing the curved distribution of vertical and horizontal arc-extinguishing grid groups and the staggered oblique groove structure in the arc-extinguishing chamber of the circuit breaker, the problems of increased circuit breaker size and insufficient breaking capacity in the existing technology have been solved, achieving more efficient arc cutting and extinguishing, and improving the breaking capacity and stability of the circuit breaker.
Patent Information
- Application Number
- CN202520045726.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-09
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2035-01-09
AI Technical Summary
In existing circuit breakers, increasing the number of arc-extinguishing chamber plates to improve breaking capacity leads to an increase in circuit breaker size, a decrease in the number of adjacent plates, affecting breaking capacity, and the close proximity of the moving contact to the plates makes it prone to breakdown, causing arc exit, reduced breaking capacity, or even failure.
The vertical arc-extinguishing grid plate group and the horizontal arc-extinguishing grid plate group are arranged in a curved distribution. The main body of the arc-extinguishing grid plate is arranged from the middle of the arc-extinguishing chamber to the direction away from the moving contact. The number of grid plates is increased and the distance between the moving contact and the grid plate is increased. The efficiency of arc cutting is improved by using staggered oblique grooves and the edge of the arc-extinguishing grid plate.
It improves the space utilization and breaking capacity of the circuit breaker, avoids arc exit, enhances the breaking capacity and stability of the circuit breaker, and extends the service life of key components.
Smart Images
Figure CN223712698U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to circuit breaker arc-extinguishing chamber technical field, especially in a kind of circuit breaker arc-extinguishing chamber and circuit breaker. BACKGROUND
[0002] Arc-extinguishing chamber is a closed space for extinguishing electric arc. In circuit breaker, when current is cut off, strong electric arc will be generated. If this electric arc is not extinguished in time, not only the equipment will be damaged, but also fire may be caused. Therefore, the design and use of arc-extinguishing chamber are particularly important.
[0003] The arc-extinguishing chamber of the prior art circuit breaker usually adopts the way of lengthening or heightening the space of arc-extinguishing chamber area to increase the number of arranged arc-extinguishing chamber vanes and improve breaking capacity. However, this also leads to further increase in the volume of the circuit breaker, and under the condition that the edge distance of adjacent vanes at the electric arc inlet is constant, the number of arranged vanes is small, which affects the breaking capacity of the circuit breaker. In addition, the distance between the vane directly opposite to the opening position of the moving contact and the moving contact is close. In the breaking process of the circuit breaker, even if the electric arc enters the arc-extinguishing chamber vane and is cut into short arc, due to the existence of near-pole voltage drop, there is high voltage between the moving contact and the vane at this time, and the distance between the vane directly opposite to the opening position of the moving contact and the moving contact is close, which leads to breakdown of the moving contact and the vane directly opposite to the opening position of the moving contact, so that the electric arc exits the arc-extinguishing chamber from the upper vane in the figure, the number of arc-extinguishing chamber vanes actually participating in cutting electric arc into short arc is reduced, and the breaking capacity of the circuit breaker is deteriorated or even failure.
[0004] Therefore, a circuit breaker arc-extinguishing chamber and circuit breaker are proposed to solve the above problems. INVENTION CONTENTS
[0005] In order to make up for the deficiencies of the prior art, the arc-extinguishing chamber usually adopts the way of lengthening or heightening the space of arc-extinguishing chamber area to increase the number of arranged arc-extinguishing chamber vanes and improve breaking capacity. However, this also leads to further increase in the volume of the circuit breaker, and under the condition that the edge distance of adjacent vanes at the electric arc inlet is constant, the number of arranged vanes is small, which affects the breaking capacity of the circuit breaker. In addition, the distance between the vane directly opposite to the opening position of the moving contact and the moving contact is close. In the breaking process of the circuit breaker, even if the electric arc enters the arc-extinguishing chamber vane and is cut into short arc, due to the existence of near-pole voltage drop, there is high voltage between the moving contact and the vane at this time, and the distance between the vane directly opposite to the opening position of the moving contact and the moving contact is close, which leads to breakdown of the moving contact and the vane directly opposite to the opening position of the moving contact, so that the electric arc exits the arc-extinguishing chamber from the upper vane in the figure, the number of arc-extinguishing chamber vanes actually participating in cutting electric arc into short arc is reduced, and the breaking capacity of the circuit breaker is deteriorated or even failure.
[0006] The utility model discloses a circuit breaker arc-extinguishing chamber, including arc-extinguishing chamber subassembly, arc-extinguishing chamber subassembly includes fixed subassembly, the inside installation of fixed subassembly has horizontal arc-extinguishing grid piece group and vertical arc-extinguishing grid piece group, vertical arc-extinguishing grid piece group with horizontal arc-extinguishing grid piece group all includes several arc-extinguishing grid main parts, and the arc-extinguishing grid main part inside vertical arc-extinguishing grid piece group is arranged from the middle position of arc-extinguishing chamber subassembly to the direction of moving away from moving contactor subassembly.
[0007] Preferably, the arc-extinguishing grid main parts inside the vertical arc-extinguishing grid piece group and the horizontal arc-extinguishing grid piece group are arranged in a curve on the arc entry side, and the arc-extinguishing grid main parts in the vertical arc-extinguishing grid piece group are arranged from the middle position of the arc-extinguishing chamber subassembly to the position away from the moving contactor subassembly.
[0008] Preferably, the fixed subassembly includes two fixed plates, and the opposite surfaces of the two fixed plates are both provided with a slot penetrating through the fixed plate; the outer surfaces of all the arc-extinguishing grid main parts are both fixedly connected with a fixed column; and the outer wall of the fixed column is inserted into the inner wall of the slot.
[0009] Preferably, the edges of the arc-extinguishing grid main parts close to the moving contactor subassembly are all fixedly connected with two arc-extinguishing grid piece feet; and the arc-extinguishing grid piece feet are evenly distributed outside the separation path of the moving contactor subassembly and the stationary contactor subassembly.
[0010] Preferably, the middle parts of the arc-extinguishing grid main parts close to the moving contactor subassembly are all provided with a bevel groove; and the bevel grooves on the opposite sides of adjacent two arc-extinguishing grid main parts are oppositely inclined and staggered.
[0011] Preferably, the distances between the bevel grooves inside the adjacent arc-extinguishing grid main parts in the vertical arc-extinguishing grid piece group and the horizontal arc-extinguishing grid piece group are the same.
[0012] Preferably, the arc-extinguishing grid main parts arranged in a curve have a gradually decreasing inclination angle along the direction close to the stationary contactor subassembly.
[0013] The utility model discloses a circuit breaker, including body, operating mechanism, moving contactor subassembly, stationary contactor subassembly and the circuit breaker arc-extinguishing chamber of any of the preceding claims.
[0014] Thanks to the above technical scheme, the utility model has the following technical progress compared with the prior art:
[0015] 1. The utility model provides a circuit breaker arc extinguishing chamber and circuit breaker, through the inside arc extinguishing grid piece main body of vertical arc extinguishing grid piece group is arranged from the middle position of arc extinguishing chamber subassembly to the direction of away from the moving contact assembly, and the inside arc extinguishing grid piece main body of vertical arc extinguishing grid piece group and horizontal arc extinguishing grid piece group is in the curve distribution on arc entry side, like this, under the condition that the edge distance of adjacent arc extinguishing grid piece main body at arc entry is certain, can arrange more arc extinguishing grid piece main body, and then can improve the space utilization rate in the circuit breaker, and it is favorable to the breaking capacity of circuit breaker.
[0016] 2. Through the inside arc extinguishing grid piece main body of vertical arc extinguishing grid piece group is arranged from the middle position of arc extinguishing chamber subassembly to the direction of away from the moving contact assembly, can increase the distance between the arc extinguishing grid piece main body of opposite moving contact assembly opening position and moving contact assembly, avoid moving contact assembly and arc extinguishing grid piece main body of opposite moving contact assembly opening position breakdown and make arc from the arc extinguishing grid piece main body of upper part in the drawing partially exit arc extinguishing chamber, increase the number of arc extinguishing grid piece main body actual participation cutting arc into short arc, further improve the breaking capacity of circuit breaker. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 It is the whole structure schematic diagram of the utility model;
[0018] Figure 2 It is the whole cross section structure schematic diagram of the utility model;
[0019] Figure 3 It is the explosion effect schematic diagram of arc extinguishing chamber subassembly of the utility model;
[0020] Figure 4 It is the arc extinguishing grid piece main body structure schematic diagram of the utility model.
[0021] In the drawing: 1, machine body;2, operating mechanism;3, moving contact assembly;31, moving contact point assembly;4, static contact assembly;41, static contact point assembly;42, arc guide;5, arc extinguishing chamber subassembly;51, fixed assembly;511, slot;52, horizontal arc extinguishing grid piece group;53, vertical arc extinguishing grid piece group;531, arc extinguishing grid piece main body;532, arc extinguishing grid piece edge foot;533, fixed column;534, bevel slot. DETAILED DESCRIPTION
[0022] The technical scheme in the embodiments of the utility model will be apparently and completely described in combination with the drawings in the embodiments of the utility model, obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without making creative labor belong to the range of protection of the utility model.
[0023] The specific embodiments are given below.
[0024] Referring to Figure 1 - Figure 4 The utility model provides a technical scheme: a circuit breaker arc extinguishing chamber, including arc extinguishing chamber subassembly 5, its characterized in be: arc extinguishing chamber subassembly 5 includes fixed assembly 51, the inside installation of fixed assembly 51 has horizontal arc extinguishing fin group 52 and vertical arc extinguishing fin group 53, vertical arc extinguishing fin group 53 with horizontal arc extinguishing fin group 52 all include several arc extinguishing fin main bodies, the inside arc extinguishing fin main body 531 of vertical arc extinguishing fin group 53 is arranged from the middle position of arc extinguishing chamber subassembly 5 to the direction of moving contact assembly 3, and the inside arc extinguishing fin main body 531 of vertical arc extinguishing fin group 53 with horizontal arc extinguishing fin group 52 is in the curve distribution at arc entry side, and the arc extinguishing fin main body 531 in vertical arc extinguishing fin group 53 is from the middle position of arc extinguishing chamber subassembly 5 to the position of moving contact assembly 3 distribution, the special distribution makes the distance between arc extinguishing fin main body 531 in the upper and lower position of vertical arc extinguishing fin group 53 and moving contact assembly 3 greater than the distance between arc extinguishing fin main body 531 in the middle position and moving contact assembly 3, so that more arc extinguishing fin main bodies 531 can be arranged under the condition that the edge distance of adjacent arc extinguishing fin main bodies 531 at arc entry is certain, and the space utilization of circuit breaker can be improved, and the breaking capacity of circuit breaker is improved, and the distance between arc extinguishing fin main body 531 in the opening position opposite moving contact assembly 3 and moving contact assembly 3 can be increased, the arc is prevented from exiting the arc extinguishing chamber from the upper arc extinguishing fin main body 531 again by the breakdown of moving contact assembly 3 and arc extinguishing fin main body 531 in the opening position opposite moving contact assembly 3, the number of arc extinguishing fin main bodies 531 actually participating in cutting arc into short arc is increased, and the breaking capacity of circuit breaker is further improved.
[0025] As Figure 3 shown, fixed assembly 51 includes two fixed plates, and the opposite faces of the two fixed plates are both provided with a slot 511 penetrating through the fixed plate, and both sides of the outer surface of each arc extinguishing fin main body 531 are fixedly connected with a fixed column 533, and the outer wall of the fixed column 533 is inserted into the inner wall of the slot 511, so that the position of the arc extinguishing fin main body 531 can be installed and limited through the insertion between the fixed column 533 and the slot 511, thereby improving the stability of the circuit breaker.
[0026] As Figure 2 and Figure 4As shown, the edges of all arc-extinguishing grid bodies 531 close to the side of the moving contact assembly 3 are fixedly connected with two arc-extinguishing grid feet 532, which are evenly distributed outside the separation path of the moving contact assembly 3 and the static contact assembly 4. The top of the static contact assembly 4 is fixedly installed with a static contact point assembly 41, the bottom end of which is fixedly connected with an arc striking piece 42. The bottom end of the moving contact assembly 3 is fixedly installed with a moving contact point assembly 31. When the moving contact assembly 3 and the static contact assembly 4 are separated, if the current is large, strong arc will be generated between them. At this time, the arc-extinguishing grid feet 532 can quickly pull the arc into the arc-extinguishing grid body 531, and cut the arc into many short arcs by the segmentation of the arc-extinguishing grid body 531. These short arcs will be extinguished at the same time when the alternating current is zero, thereby effectively extinguishing the arc, avoiding the arc from exiting the arc-extinguishing chamber assembly 5 from the side of the arc-extinguishing grid body 531, and further causing the breaking capacity of the circuit breaker to be poor or even breaking failure. The even distribution of the arc-extinguishing grid feet 532 outside the separation path of the moving contact assembly 3 and the static contact assembly 4 ensures the pulling capacity and absorption range of the arc.
[0027] As shown in Figure 4 , the middle part of all arc-extinguishing grid bodies 531 close to the side of the moving contact assembly 3 is provided with a beveled groove 534, and the inclined directions of the beveled grooves 534 on the sides of adjacent two arc-extinguishing grid bodies 531 are opposite, arranged in a staggered manner. The staggered beveled grooves 534 make the arc-extinguishing grid bodies 531 arranged in a staggered manner when facing the arc, so as to form a hierarchical arc-extinguishing structure. The unevenness of the up-down and front-back can better refine and cut the arc, thereby helping to more effectively disperse and extinguish the arc.
[0028] As shown in Figure 2 and Figure 4 , the spacing between the beveled grooves 534 inside the adjacent arc-extinguishing grid bodies 531 in the vertical arc-extinguishing grid group 53 and the horizontal arc-extinguishing grid group 52 is the same. The same spacing can ensure that the cooling and deionization effects on the arc moving in the arc-extinguishing grid body 531 will be more uniform, which helps to ensure that the arc is stably extinguished in the arc-extinguishing grid body 531, improves the arc-extinguishing efficiency, and at the same time, the same spacing can simplify the manufacturing process of the circuit breaker, reduce production costs, and be easier to perform quality control and performance testing. In this embodiment, the spacing between the arc-extinguishing grid bodies 531 is set to 1.8 mm. If the spacing between the arc-extinguishing grid bodies 531 is too small, it will increase the resistance of the arc moving in the arc-extinguishing grid body 531, slow down the arc speed, and thus prolong the arc-extinguishing time. If the spacing between the arc-extinguishing grid bodies 531 is too large, it may weaken the deionization effect of the arc-extinguishing grid body 531 on the arc, which is also not conducive to arc extinction, and also occupies more space and increases costs.
[0029] As shown in Figure 2As shown, the arc-extinguishing grid piece bodies 531 arranged in curves gradually decrease in the inclination angle along the direction close to the static contact assembly 4, and the lowermost arc-extinguishing grid piece body 531 is parallel to the arc striking piece 42, when the moving contact assembly 31 is just separated from the static contact assembly 41, the arc is initially and violently generated, the arc-extinguishing grid piece bodies 531 form the relatively smooth curves from the parallel to the curve, which can make the arc more smoothly transition from the arc striking piece 42 to the arc-extinguishing grid piece bodies 531, so as to more effectively utilize the cooling and deionization effect of the arc-extinguishing grid piece bodies 531, accelerate the extinction of the arc, and the design from the parallel to the curve can reduce the direct impact of the arc on the arc striking piece 42 and the arc-extinguishing grid piece bodies 531, thereby prolonging the service life of the arc striking piece 42 and the arc-extinguishing grid piece bodies 531.
[0030] The working principle of the utility model is: in the circuit breaker, when the current is cut off, the moving contact assembly 31 is separated from the static contact assembly 41, and the arc is initially and violently generated, at this time, the arc striking piece 42 transitions the arc to the arc-extinguishing grid piece bodies 531 parallel to the arc striking piece 42, thereafter, in the path of the moving contact assembly 3 and the static contact assembly 4, the arc-extinguishing grid piece side foot 532 can rapidly pull the arc in the middle of the arc-extinguishing grid piece bodies 531, in this process, the smooth curve formed by the arc-extinguishing grid piece bodies 531 reduces the direct impact of the arc on the arc striking piece 42 and the arc-extinguishing grid piece bodies 531, and simultaneously increases the number of arc-extinguishing grid piece bodies actually participating in cutting the arc into short arcs, improves the breaking capacity of the circuit breaker, at this time, the arc is elongated and then segmented under the staggered action of the bevel grooves 534, and the up-and-down and front-and-back unevenness can better refine and cut the arc, after the arc is cut into many short arcs, the short arcs are simultaneously extinguished when the alternating current is zero, thereby effectively extinguishing the arc.
[0031] The basic principle and main features of the utility model and the advantages of the utility model are shown and described above. It should be understood by those skilled in the art that the utility model is not limited by the above-mentioned embodiments, the above-mentioned embodiments and the description in the specification are only to illustrate the principle of the utility model, under the premise of not departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the utility model claimed. The protection scope of the utility model is defined by the appended claims and their equivalents.
Claims
1. A circuit breaker arc chamber, comprising an arc chamber assembly (5), the arc chamber assembly (5) comprising a fixed assembly (51), the inside of the fixed assembly (51) being mounted with a transverse arc extinguishing fin group (52) and a vertical arc extinguishing fin group (53), the vertical arc extinguishing fin group (53) and the transverse arc extinguishing fin group (52) each comprising a plurality of arc extinguishing fin bodies (531), characterized in that: The inner arc-extinguishing fin body (531) of the vertical arc-extinguishing fin group (53) is arranged from the middle position of the arc-extinguishing chamber assembly (5) to the direction away from the moving contact assembly (3).
2. The circuit breaker arc chute of claim 1, wherein: The inner arc-extinguishing fin body (531) of the vertical arc-extinguishing fin group (53) and the horizontal arc-extinguishing fin group (52) are arranged in a curve on the arc entry side, and the arc-extinguishing fin bodies (531) in the vertical arc-extinguishing fin group (53) are arranged from the middle position of the arc-extinguishing chamber assembly (5) to the position away from the moving contact assembly (3).
3. The circuit breaker arc chute of claim 1 wherein: The fixed assembly (51) comprises two fixed plates, the opposite surfaces of the two fixed plates are provided with the insertion slots (511) penetrating through the fixed plates, the outer surfaces of all the arc-extinguishing fin bodies (531) are fixedly connected with the fixed columns (533), and the outer wall of the fixed column (533) is inserted into the inner wall of the insertion slot (511).
4. The circuit breaker arc chute of claim 1 wherein: The edges of all the arc-extinguishing fin bodies (531) near the moving contact assembly (3) are fixedly connected with the two arc-extinguishing fin feet (532), and the arc-extinguishing fin feet (532) are evenly distributed outside the separation path of the moving contact assembly (3) and the stationary contact assembly (4).
5. The circuit breaker arc chute of claim 1 wherein: The middle portions of all the arc-extinguishing fin bodies (531) near the moving contact assembly (3) are provided with the bevel grooves (534), and the inclined directions of the bevel grooves (534) on the opposite sides of the adjacent two arc-extinguishing fin bodies (531) are opposite, and the adjacent two arc-extinguishing fin bodies (531) are arranged in a staggered manner.
6. The circuit breaker arc chute of claim 1 wherein: The distance between the inner bevel grooves (534) of the adjacent arc-extinguishing fin bodies (531) in the vertical arc-extinguishing fin group (53) and the horizontal arc-extinguishing fin group (52) is the same.
7. The circuit breaker arc chute of claim 1 wherein: The inclined angles of the arc-extinguishing fin bodies (531) arranged in a curve gradually decrease along the direction close to the stationary contact assembly (4).
8. A circuit breaker characterized by: The circuit breaker comprises a body (1), an operating mechanism (2), a moving contact assembly (3), a stationary contact assembly (4) and the arc-extinguishing chamber of any one of claims 1 to 7.