Circuit breaker arc extinguishing system
By increasing the spacing between dynamic and static contacts and introducing air blowing and magnetic blowing, combined with multi-piece grid cutting, the problem of arc breaking of circuit breakers is solved, and efficient arc extinguishing and extended circuit breaker life are achieved.
Patent Information
- Application Number
- CN202422339123.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-25
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-09-25
AI Technical Summary
In the new energy DC system, it is difficult to quickly introduce the arc into the arc extinguishing chamber at high voltage, resulting in increased difficulty in breaking the arc and reduced electric life.
A circuit breaker arc extinguishing system is designed, including a housing, a moving contact, a static contact, an arc extinguishing chamber, an arc separator assembly and an arc-induced plate. By increasing the spacing between the dynamic and static contacts, the arc is quickly entered into the arc extinguishing chamber by using air blowing and magnetic blowing, and the arc is cut and cooled through multiple grids.
It realizes rapid introduction and cutting of arcs at high voltages, improves the extinguishing efficiency of arcs, and extends the electrical life of circuit breakers.
Smart Images
Figure CN223123853U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of circuit breakers, and particularly relates to an arc extinguishing system for a circuit breaker. Background Art
[0002] A circuit breaker is a mechanical switching device that can connect, carry, and break the current under normal circuit conditions, and can also connect, carry, and break the current under abnormal circuit conditions within a specified time. When a fault current occurs in the circuit, the circuit breaker disconnects, and an arc will be generated between the moving and static contacts. It is necessary to completely break and extinguish the arc through a complete set of arc extinguishing systems, so that the faulty equipment and lines are disconnected from the power grid, realizing the protection of the equipment and lines.
[0003] Currently, the new energy system is developing rapidly. In order to reduce costs and increase efficiency, increasing the system voltage is the main way to improve the efficiency and reduce the cost of new energy-related systems such as photovoltaic, energy storage, and charging piles. However, increasing the voltage will significantly increase the difficulty of arc breaking of the circuit breaker, and the electrical life times will also be significantly reduced. New energy-related systems are generally low-voltage DC systems, and the arc will not automatically extinguish at the zero crossing. When breaking, it is necessary to increase the arc voltage by lengthening the arc, cooling the arc, compressing the arc, and cutting the arc with metal grid sheets to force the DC current to cross zero. When the arc voltage is greater than the power supply voltage on both sides of the circuit breaker, the arc current begins to decrease. When the arc current is zero, the arc is completely broken and extinguished.
[0004] Existing circuit breakers generally have a small opening distance, a small number of arc extinguishing grid sheets, and a poor overall arc leading structure. When the DC system voltage is high and a current short-circuit fault occurs, the arc between the moving and static contacts cannot be quickly led into the arc extinguishing chamber to cut and lengthen the arc, and finally cool and extinguish the arc. Summary of the Utility Model
[0005] In order to overcome the deficiencies of the background art, the utility model provides an arc extinguishing system for a circuit breaker with good arc leading effect.
[0006] The technical solution adopted by the utility model: An arc extinguishing system for a circuit breaker, comprising a housing, a moving contact, a static contact, and an arc extinguishing chamber. An arc isolation component that clamps the lower positions of the moving contact and the static contact is arranged inside the housing. The arc extinguishing chamber includes:
[0007] An arc extinguishing cover, which is installed on the inner wall of the housing;
[0008] Grid sheets, which are inserted into the arc extinguishing cover and arranged in a stacked manner;
[0009] An arc leading sheet, one end of which is located at the bottom of the arc extinguishing cover and the other end extends out after passing through the arc isolation component;
[0010] Two protruding first grid sheets are arranged in the grid sheets, and the upper end of the arc leading sheet is close to the moving contact and the static contact.
[0011] The arc separating component includes an upper arc separating plate and a lower arc separating plate which are connected to each other. An upper magnetic conductive plate is inserted into the upper arc separating plate, and a lower magnetic conductive plate is inserted into the lower arc separating plate. A magnetic conductive block is provided on the housing at a position corresponding to the static contact.
[0012] The cross-sections of both the upper arc separating plate and the lower arc separating plate are U-shaped.
[0013] A stop block extending in the thickness direction is provided at the lower right corner of the lower arc separating plate, and a support plate extending in the thickness direction is provided at the lower right corner of the lower magnetic conductive plate.
[0014] A positioning block is provided on the outer side wall of the stop block, and a positioning groove corresponding to and adapted to the positioning block is provided on the support plate.
[0015] The number of the grid sheets is 15, and the distance between two adjacent grid sheets is 1 mm.
[0016] A plurality of partition plates are provided on the housing at intervals at a position corresponding to the end of the arc extinguishing chamber.
[0017] The beneficial effects of the present utility model are as follows: When a fault current occurs in the circuit, the circuit breaker disconnects, and an arc is generated between the moving contact and the static contact. When the arc is generated, when one end of the arc jumps from the moving contact to the arc guiding piece, the arc moves between the grid sheets of the arc extinguishing cover through the arc guiding angle and the arc guiding piece of the static contact; at this time, the two most prominent first grid sheets of the arc extinguishing cover can introduce the arc into the arc extinguishing chamber faster, having the advantage of good arc guiding effect. Description of the Drawings
[0018] Figure 1 It is a schematic structural diagram of the arc extinguishing system of the circuit breaker according to the embodiment of the present utility model.
[0019] Figure 2 It is a schematic structural diagram of the lower arc separating plate and the lower magnetic conductive plate.
[0020] Figure 3 It is a schematic structural diagram of the lower magnetic conductive plate.
[0021] Figure 4 It is a schematic structural diagram of the arc separating component.
[0022] Figure 5 It is a schematic structural diagram of the arc extinguishing chamber.
[0023] Figure 6 It is a three-dimensional structural diagram of the circuit breaker arc extinguishing system. Detailed Embodiment
[0024] The following further describes the embodiments of the present utility model with reference to the drawings:
[0025] As shown in the figure, a circuit breaker arc extinguishing system includes a housing 1, a moving contact 2, a static contact 3, and an arc extinguishing chamber 4. An arc isolation assembly that clamps the lower positions of the moving contact 2 and the static contact 3 is provided inside the housing 1. The arc extinguishing chamber 4 includes:
[0026] An arc extinguishing cover 41, which is installed on the inner wall of the housing 1;
[0027] Grid plates 42, which are inserted into the arc extinguishing cover 41 and stacked;
[0028] An arc guiding plate 43, one end of which is located at the bottom of the arc extinguishing cover 41 and the other end of which extends out after passing through the arc isolation assembly;
[0029] Two protruding first grid plates 44 are provided in the grid plates 42, and the upper end of the arc guiding plate 43 is close to the moving contact 2 and the static contact 3; when the moving contact and the static contact are fully opened, since the distance between the moving contact and the static contact is greater than 10 mm, it is difficult for the arc to reignite between the moving contact and the static contact, and the arc can only move downward under the action of gas blowing and magnetic blowing; when one end of the arc jumps from the moving contact to the arc guiding plate, the arc moves to between the grid plates of the arc extinguishing cover through the arc guiding angle of the static contact and the arc guiding plate; at this time, the two most protruding first grid plates of the arc extinguishing cover can introduce the arc into the arc extinguishing chamber faster, and the arc is cut into 16 segments through the magnetic yoke 14, the arc extinguishing cover and the arc guiding plate; the more the number of grid plates of the arc extinguishing cover, the more segments can be cut. When the number of grid plates 42 is 15 and the distance between two adjacent grid plates 42 is 1 mm, the voltage between the grid plates is about 25 V. The staggered grid plates in the arc extinguishing chamber make the distance of the arc longer, quickly raise the arc voltage, and quickly cool in the grid plates of the arc extinguishing chamber, and the arc current begins to decrease; when the arc current is zero, the arc is completely disconnected and extinguished.
[0030] Among them, the magnetic yoke 14 is located at the upper end of the arc extinguishing cover.
[0031] An arc isolation assembly that clamps the lower positions of the moving contact 2 and the static contact 3 is further provided inside the housing 1. The arc isolation assembly includes an upper arc isolation plate 7 and a lower arc isolation plate 8 that are connected to each other; an upper magnetic conductive plate 9 is inserted into the upper arc isolation plate 7, a lower magnetic conductive plate 10 is inserted into the lower arc isolation plate 8, and a magnetic conductive block 12 is provided at the position of the housing 1 corresponding to the static contact 3; when the arc moves downward, due to the magnetic blowing effect of the closed magnetic circuit formed by the upper magnetic conductive plate, the lower magnetic conductive plate and the magnetic conductive block on the arc, the arc moves downward quickly; and with the compression of the upper arc isolation plate and the lower arc isolation plate, the arc continues to move quickly downward under the action of gas blowing and magnetic blowing.
[0032] Among them, Figure 1 and Figure 6 The upper arc isolation plate 7 and the upper magnetic conductive plate are not shown. For the structural schematic diagram of the upper arc isolation plate 7 and the lower arc isolation plate 8, reference can be made toFigure 6 。
[0033] The cross-sections of the upper arc partition plate 7 and the lower arc partition plate 8 are both U-shaped. The installation structures of the upper magnetic conduction plate and the upper arc partition plate, and the lower magnetic conduction plate and the lower arc partition plate are both plug-in structures, which have the advantages of convenient installation and simple structure.
[0034] A stop block 81 extending in the thickness direction is provided at the lower right corner of the lower arc partition plate 8, and a support plate 101 extending in the thickness direction is provided at the lower right corner of the lower magnetic conduction plate 10; as Figure 3 and 6 shown, the stop block 81 and the support plate 101 are located at the lower right corner. Under the action of gas blowing and magnetic blowing, the electric arc moves rapidly downward. The support plate is inclined and will also provide a magnetic blowing effect to change the direction of the electric arc and direct it to the arc extinguishing chamber.
[0035] A positioning block 82 is provided on the outer side wall of the stop block 81, and a positioning groove 102 corresponding to and adapted to the positioning block 82 is provided on the support plate 101, which is convenient for installation.
[0036] A plurality of spaced partition plates 13 are provided at the position of the housing 1 corresponding to the end of the arc extinguishing chamber 4; the end of the arc extinguishing chamber 4 is the arc outlet of the arc extinguishing cover. The number of partition plates is two. Three channels will be formed between the inner walls on both sides of the housing and the partition plates. These three channels divide the electric arc at the arc outlet of the arc extinguishing cover into three large segments, which can ensure that the electric arc can be evenly discharged from the product.
[0037] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0038] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, in the description of the present utility model, unless otherwise stated, the meaning of "a plurality of" is two or more.
[0039] All technicians should note that although the present utility model has been described according to the above specific embodiments, the inventive concept of the present utility model is not limited to this utility model alone. Any modification using the inventive concept of the present utility model will be included in the scope of protection of the patent right of this patent.
Claims
1. A circuit breaker arc extinguishing system, comprising a housing (1), a moving contact (2), a static contact (3) and an arc extinguishing chamber (4), characterized in that: An arc isolation component for clamping the lower positions of the moving contact (2) and the static contact (3) is provided inside the housing (1). The arc extinguishing chamber (4) includes: An arc extinguishing cover (41) which is installed on the inner wall of the housing (1); Grid plates (42) which are inserted into the arc extinguishing cover (41) and stacked; An arc leading sheet (43) with one end located at the bottom of the arc extinguishing cover (41) and the other end extending out after passing through the arc isolation component; Two protruding first grid plates (44) are provided in the grid plates (42), and the upper end of the arc leading sheet (43) is close to the moving contact (2) and the static contact (3).
2. The arc extinguishing system of the circuit breaker according to claim 1, characterized in that: The arc isolation component includes an upper arc isolation plate (7) and a lower arc isolation plate (8) which are connected to each other. An upper magnetic conduction plate (9) is inserted into the upper arc isolation plate (7), and a lower magnetic conduction plate (10) is inserted into the lower arc isolation plate (8). A magnetic conduction block (12) is provided on the housing (1) at the position corresponding to the static contact (3).
3. The arc extinguishing system of the circuit breaker according to claim 2, wherein: The cross-sections of the upper arc isolation plate (7) and the lower arc isolation plate (8) are both U-shaped.
4. The arc extinguishing system of the circuit breaker according to claim 2, characterized in that: A stop block (81) extending in the thickness direction is provided at the lower right corner position of the lower arc isolation plate (8), and a support plate (101) extending in the thickness direction is provided at the lower right corner position of the lower magnetic conduction plate (10).
5. The arc extinguishing system of the circuit breaker according to claim 4, characterized in that: A positioning block (82) is provided on the outer side wall of the stop block (81), and a positioning groove (102) corresponding to and adapted to the positioning block (82) is provided on the support plate (101).
6. The arc extinguishing system of the circuit breaker according to claim 1, characterized in that: The number of the grid plates (42) is 15, and the distance between two adjacent grid plates (42) is 1 mm.
7. The arc extinguishing system of the circuit breaker according to claim 1, characterized in that: A plurality of partition plates (13) arranged at intervals are provided on the housing (1) at the position corresponding to the end of the arc extinguishing chamber (4).