Moving contact system and circuit breaker comprising same

Abstract

The utility model provides a moving contact system and a circuit breaker comprising the same. The moving contact system comprises a plurality of contact fingers which are arranged in parallel; the contact supporting piece comprises a supporting plate and a pair of supporting arms arranged on the two sides of the supporting plate, and the first ends of the plurality of contact fingers are pivotally installed between the pair of supporting arms; the plurality of springs are arranged corresponding to the plurality of contact fingers and are positioned between the plurality of contact fingers and the supporting plate of the contact supporting piece; and the insulating grating comprises a connecting part which is arranged between the contact finger and the spring. According to the moving contact system, the insulating grating is arranged between the contact finger and the corresponding spring, so that the spring can provide larger contact pressure for overcoming electro-dynamic repulsive force during short-time tolerance, the tolerance performance is improved, meanwhile, the insulating grating and the contact finger can keep synchronous movement, friction force is reduced in the switching-on / switching-off process, and the service life of the moving contact system is prolonged. And the mechanical performance of the circuit breaker is improved.

Description

Technical Field

[0001] This utility model relates to a moving contact system and a circuit breaker including the same. Background Technology

[0002] Circuit breakers are an important part of power distribution equipment, used to connect and disconnect current in power grid circuits and protect lines and power equipment from damage caused by faults such as overload, undervoltage, and short circuit.

[0003] In practical use, when a circuit breaker is in the closed state, if a short-circuit fault occurs in the line, for selective protection purposes, the circuit breaker must be able to withstand the electrodynamic force generated by the short-circuit current for a specified time without tripping. Existing circuit breakers use insulating sheets with bosses to isolate the contacts, but this results in uncontrollable gaps between the contacts. If the gap is too large, the circuit breaker's stability during short-time withstand is poor, leading to lateral displacement of the contacts. If the gap is too small, the friction between the contacts during movement becomes excessive, resulting in a shorter circuit breaker lifespan. Utility Model Content

[0004] Therefore, in view of the above problems, this utility model provides a moving contact system and a circuit breaker including the same.

[0005] According to an embodiment of the present invention, a moving contact system includes: a plurality of contact fingers arranged in parallel; a contact support member including a support plate and a pair of support arms on both sides of the support plate, wherein the first ends of the plurality of contact fingers are pivotally mounted between the pair of support arms; a plurality of springs corresponding to the plurality of contact fingers and located between the plurality of contact fingers and the support plate of the contact support member; and an insulating grid including a connecting portion disposed between the contact fingers and the springs.

[0006] In one embodiment, one end of the spring abuts against the connecting portion, and the other end of the spring abuts against the support plate.

[0007] In one embodiment, the insulating grid further includes a pair of insulating sheets connected by the connecting portion, the pair of insulating sheets holding a touch finger between them and abutting against a touch finger adjacent to the pair of insulating sheets.

[0008] In one embodiment, the insulating grid moves synchronously with the touch finger.

[0009] In one embodiment, the contact support further includes a support shaft disposed between the pair of support arms, the support shaft passing through the plurality of contact fingers and the insulating sheet, such that the plurality of contact fingers and the insulating grid are rotatable about the support shaft.

[0010] In one embodiment, the moving contact system further includes a spacer bracket mounted to the contact support and including a spacer plate located between the support plate and the plurality of contact fingers, the plurality of springs passing through the spacer plate and thus located between the plurality of contact fingers and the support plate of the contact support.

[0011] In one embodiment, the moving contact system further includes a conductive block and a flexible connecting conductor, one end of which is connected to a first end of the plurality of contact fingers, and the other end of which is fixed to the conductive block.

[0012] In one embodiment, the moving contact system further includes a protective member that extends from the end of the spacer bracket opposite to the spacer plate and covers the outside of the flexible connection conductor.

[0013] In one embodiment, the protective member and the spacer bracket are formed as an integral structure.

[0014] In one embodiment, the first end of the finger includes a shaped protrusion, and the outer surface of the finger away from the first end includes a contact point. A groove is formed at the center of a first side of the support plate adjacent to the first end of the finger. When the first ends of the plurality of fingers are pivotally mounted between the pair of support arms, the hook-shaped protrusion of at least one finger in the middle position of the plurality of fingers engages with the groove on the first side of the support plate, such that the contact point of the at least one finger in the middle position protrudes outward higher than the contact points of the other fingers.

[0015] In one embodiment, the insulating grid is made of flexible insulating paper.

[0016] According to an embodiment of the present invention, a circuit breaker includes a moving contact system as described above.

[0017] The moving contact system of this invention, by setting an insulating grid between the contact finger and the corresponding spring, enables the spring to provide greater contact pressure to overcome electrodynamic repulsion during short-term withstand operations, thereby improving withstand performance. Simultaneously, the insulating grid also provides temperature isolation for the spring, improving its temperature resistance. Because the insulating grid moves synchronously with the contact finger, friction is reduced during closing / opening, improving the mechanical performance of the circuit breaker. Furthermore, since the insulating grid can completely fit with adjacent contact fingers, it maintains a uniform gap between the contact fingers, preventing lateral deflection of the contact fingers during short-term withstand operations. Attached Figure Description

[0018] The above and other features and advantages of exemplary embodiments of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, which are for illustrative purposes only and are not intended to limit the scope of the present invention in any way, wherein:

[0019] Figure 1 This is a schematic diagram showing the exploded structure of a moving contact system according to an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram showing a spacer bracket of a moving contact system according to an embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram showing an insulating grid of a moving contact system according to an embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram showing a finger according to an embodiment of the present invention.

[0023] Figure 5 This is a schematic diagram showing a contact support member according to an embodiment of the present invention.

[0024] Figure 6 and Figure 7 This is a schematic diagram showing the assembly structure of a moving contact system according to an embodiment of the present invention.

[0025] Figure 8 This is a schematic diagram showing the structure of a circuit breaker according to an embodiment of the present invention. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0027] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of this disclosure may have fewer components, other components not shown in the drawings, different components, components arranged differently, or components with different connections, etc. Furthermore, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0028] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Where the number of components is not specified, the number of components may be one or more; similarly, the terms “a,” “the,” “described,” and similar terms do not necessarily indicate a quantity limitation. The terms “comprising,” “including,” or “including,” and similar terms mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. The terms “install,” “set,” “connect,” or “link,” and similar terms are not limited to physical or mechanical installation, setting, or connection, but may include electrical installation, setting, or connection, whether direct or indirect. “Above,” “below,” “left,” “right,” etc., are used only to indicate the relative positional relationship of the equipment during use or the positional relationship shown in the accompanying drawings; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0029] Figure 1 This is a schematic diagram showing the exploded structure of a moving contact system according to an embodiment of the present invention. Figure 2 This is a schematic diagram showing a spacer bracket according to an embodiment of the present invention.

[0030] Reference Figure 1 and Figure 2 According to an embodiment of the present invention, the moving contact system may include a contact finger 1, a contact support 2, a spacer bracket 3, a spring 4, and an insulating grid 5.

[0031] like Figure 1 As shown, multiple contact fingers 1 are arranged side by side and connected in parallel. The contact support 2 includes a support plate 21 and a pair of support arms 22 on both sides of the support plate 21. The first ends 11 of the multiple contact fingers 1 are pivotally mounted between the pair of support arms 22. A spacer bracket 3 is mounted to the contact support 2 and includes a spacer plate 31 located between the support plate 21 and the multiple contact fingers 1. The spacer bracket 3 forms a through cavity 32 therein, with the spacer plate 31 located on the side of the through cavity 32 facing the contact support 2. The multiple contact fingers 1 are disposed through the through cavity 32, with the first ends 11 of the contact fingers 1 extending out of the through cavity 32 in a first direction to be mounted between the pair of support arms 22, and the second ends 12 of the contact fingers 1 extending out of the through cavity 32 in a second direction opposite to the first direction. Multiple springs 4 are disposed corresponding to the multiple contact fingers 1. For example, when there are 6 contact fingers 1, there are also 6 springs 4, each corresponding to one of the contact fingers 1. The spring 4 can pass through the through hole 311 in the spacer 31 and is thus positioned between the support plate 21 of the plurality of contact fingers 1 and the contact support member 2.

[0032] Figure 3 This is a schematic diagram illustrating an insulating grid according to an embodiment of the present invention. The insulating grid 5 includes a connecting portion 51 disposed between a contact finger 1 and a corresponding spring 4, and a pair of insulating sheets 52 connected by the connecting portion 52. The pair of insulating sheets 52 sandwiches a contact finger 1 between them and abuts against the contact fingers adjacent to the pair of insulating sheets 52. Thus, the insulating grid can maintain a uniform gap between the contact fingers and prevent the contact fingers from deflecting laterally during short-term withstand of the circuit breaker.

[0033] In one embodiment of this disclosure, one end of the spring 4 abuts against the connecting portion 51 of the insulating grid 5, and the other end of the spring 4 abuts against the support plate 21. Since the connecting portion 51 of the insulating grid 5 is located between the contact finger 1 and the corresponding spring 4, the compression stroke of the spring 4 is increased when the circuit breaker is closed. This allows the spring 4 to provide greater contact finger pressure, thereby improving the short-time withstand performance of the circuit breaker. Simultaneously, the connecting portion 51 of the insulating grid 5 also provides temperature isolation for the spring 4, improving its temperature resistance.

[0034] The contact support 2 also includes a support shaft 23 disposed between a pair of support arms 22. A through hole 15 is formed near the first end 11 of the contact finger 1, and a pair of insulating sheets 52 of the insulating grid 5 also have through holes 521. The support shaft 23 passes through the through holes 15 of each of the multiple contact fingers 1 and the through holes 521 of the insulating sheets 52 of the insulating grid 5, allowing the multiple contact fingers 1 and the insulating grid 5 to rotate around the support shaft 23, thereby enabling the contact fingers to move between the closed and open positions. Since the insulating grid 5 and the contact fingers 1 are disposed on the same support shaft 23, it can be ensured that the insulating grid 5 and the contact fingers 1 maintain synchronous movement during the closing and opening processes, thereby effectively reducing friction and other resistances and improving the mechanical performance of the circuit breaker.

[0035] Figure 4 This is a schematic diagram showing a finger according to an embodiment of the present invention. Figure 5 This is a schematic diagram showing a contact support member according to an embodiment of the present invention. Figure 6 and Figure 7 This is a schematic diagram illustrating the assembly structure of a moving contact system according to an embodiment of the present invention. Each contact finger 1 has a hook-shaped protrusion 14 formed at its first end 11, and a contact point 13 is provided on the outer surface of each contact finger 1 away from its first end 11 for electrical connection with the stationary contact when the circuit breaker is closed. For example, the contact point 13 can be a silver dot. A groove 212 is formed at the center of the first side 211 of the support plate 21 adjacent to the first end 11 of the contact finger 1. Figure 6 and 7As shown, when the first ends 11 of a plurality of contact fingers 1 are pivotally mounted between a pair of support arms 22, the hook-shaped protrusion 14 of at least one contact finger 1 (e.g., two contact fingers 1) in the middle position engages with the groove 212 on the first side 211 of the support plate 21, such that the contact point 13 of the contact finger 1 in the middle position protrudes outward relative to the contact points 13 of the other contact fingers 1, thereby being higher than the contact points 13 of the other contact fingers 1. Thus, the middle contact finger, which is higher than the other contact fingers, acts as an arc contact finger. When the circuit breaker is closed, the middle contact finger contacts the stationary contact first, and when the circuit breaker is opened, the middle moving contact finger separates from the stationary contact.

[0036] According to an embodiment of the present invention, the moving contact system further includes a conductive block 6 and a flexible connecting conductor 7. The flexible connecting conductor 7 is disposed corresponding to the contact finger 1, one end of the flexible connecting conductor 7 is connected to the first end 11 of the contact finger 1, and the other end of the flexible connecting conductor is fixed to the conductive block 6. The current path in the moving contact system is as follows: the current sequentially passes through the conductive block 6, the flexible connecting conductor 7, the contact finger 1, and the contact point 13 of the contact finger 1, and reaches the stationary contact of the circuit breaker.

[0037] In one embodiment of this disclosure, the moving contact system further includes a protective member 33, which extends from the end of the spacer bracket 3 opposite to the spacer plate 31 and covers the outer side of the flexible connection conductor 7. The protective member 33 may be formed in a sheet shape to provide shielding and protection. The protective member 33 and the spacer bracket 3 may be formed as an integral structure. The protective member 33 effectively protects the flexible connection conductor 7 from the erosion of arc particles, improving the electrical performance of the circuit breaker.

[0038] In one embodiment of this disclosure, the moving contact system may include two or more insulating grids 5. The insulating grids 5 may be made of a material with a lower conductivity than the contact finger 1. For example, the contact finger 1 may be made of copper. The insulating grids may be made of flexible insulating paper.

[0039] Figure 8 This is a schematic diagram illustrating the structure of a circuit breaker according to an embodiment of the present invention. As shown, the circuit breaker 100 includes a moving contact system 110. The moving contact system 110 can be used as a reference. Figures 1 to 7 The moving contact system described according to an embodiment of the present invention.

[0040] According to an embodiment of the utility model, the moving contact system, by providing an insulating grid between the contact finger and the corresponding spring, enables the spring to provide greater contact pressure to overcome electrodynamic repulsion during short-term withstand operations, thereby improving withstand performance. Simultaneously, the insulating grid also provides temperature isolation for the spring, improving its temperature resistance. Because the insulating grid moves synchronously with the contact finger, friction is reduced during closing / opening, improving the mechanical performance of the circuit breaker. Furthermore, since the insulating grid can fully conform to adjacent contact fingers, it maintains a uniform gap between the contact fingers, preventing lateral deflection of the contact fingers during short-term withstand operations.

[0041] Although the present invention has been described in the specification and illustrated in the accompanying drawings with reference to various embodiments, those skilled in the art will understand that the above embodiments are merely preferred embodiments, and some technical features in the embodiments may not be necessary for solving specific technical problems, so these technical features may be omitted or omitted without affecting the solution to the technical problem or the formation of the technical solution; moreover, the features, elements and / or functions of one embodiment may be appropriately combined, combined or coordinated with the features, elements and / or functions of one or more other embodiments, unless such combination, combination or coordination is obviously not feasible.

Claims

1. A moving contact system, characterized in that, The moving contact system includes: Multiple tentacles arranged side by side; A contact support includes a support plate and a pair of support arms on both sides of the support plate, wherein the first ends of the plurality of contact fingers are pivotally mounted between the pair of support arms; Multiple springs, corresponding to the multiple contact fingers, are located between the multiple contact fingers and the support plate of the contact support member; and An insulating grid includes a connection portion disposed between the contact finger and the spring.

2. The moving contact system according to claim 1, characterized in that, One end of the spring abuts against the connecting part, and the other end of the spring abuts against the support plate.

3. The moving contact system according to claim 1, characterized in that, The insulating grid also includes a pair of insulating sheets connected by the connecting portion, the pair of insulating sheets holding a touch finger between them and abutting against the touch finger adjacent to the pair of insulating sheets.

4. The moving contact system according to claim 3, characterized in that, The insulating grid moves synchronously with the finger.

5. The moving contact system according to claim 4, characterized in that, The contact support also includes a support shaft disposed between the pair of support arms. The support shaft passes through the plurality of contact fingers and the insulating sheet, allowing the plurality of contact fingers and the insulating grid to rotate about the support shaft.

6. The moving contact system according to claim 1, characterized in that, The moving contact system further includes a spacer bracket mounted to the contact support member, and includes a spacer plate located between the support plate and the plurality of contact fingers. The plurality of springs pass through the spacer and are located between the plurality of contact fingers and the support plate of the contact support member.

7. The moving contact system according to claim 6, characterized in that, The moving contact system also includes a conductive block and a flexible connecting conductor. One end of the flexible connector is connected to the first end of the plurality of contact fingers, and the other end of the flexible connector is fixed to the conductive block.

8. The moving contact system according to claim 7, characterized in that, The moving contact system further includes a protective member that extends from the end of the spacer bracket opposite to the spacer plate and covers the outside of the flexible connection conductor.

9. The moving contact system according to claim 8, characterized in that, The protective component and the spacer bracket are integrally formed.

10. The moving contact system according to claim 1, characterized in that, The first end of the finger includes a structural protrusion, and the outer surface of the finger away from the first end includes a contact point. A groove is formed at the center of the first side of the support plate adjacent to the first end of the touch finger. When the first ends of the plurality of fingers are pivotally mounted between the pair of support arms, the hook-shaped protrusion of at least one of the fingers in the middle position engages with a groove on the first side of the support plate, such that the contact point of the at least one finger in the middle position protrudes outwards higher than the contact points of the other fingers.

11. The moving contact system according to claim 1 or 3, characterized in that, The insulating grid is made of flexible insulating paper.

12. A circuit breaker, characterized in that, The circuit breaker includes: The moving contact system as described in any one of claims 1-11.

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