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, and each contact finger comprises a contact point arranged on the outer side surface; 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; one end of the indicating rod is arranged on the inner side surface of a first contact finger in the plurality of contact fingers at the position corresponding to the contact point, the other end of the indicating rod penetrates through the supporting plate, the indicating rod moves along with the contact fingers, and when the contact fingers are in the closing position, the other end of the indicating rod extends out of the supporting plate. According to the moving contact system provided by the utility model, the indicating rod is arranged at the position corresponding to the contact point of the contact finger, so that when the circuit breaker is switched on, the over travel of the circuit breaker can be accurately indicated.

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] Existing moving contact systems, due to limited space and complex application environments, cannot be equipped with sophisticated sensing devices to accurately measure the overtravel and lifespan monitoring of circuit breakers.

[0004] A common method for overtravel monitoring involves using the arc angle of the moving contact's finger in conjunction with the mounting bracket to create slots. The overtravel is then indirectly measured by projecting the arc angle of the finger onto the slots. However, this method cannot accurately measure or represent the true overtravel of the circuit breaker, thus failing to accurately determine the circuit breaker's lifespan. Utility Model Content

[0005] Therefore, in view of the above problems, this utility model provides a moving contact system and a circuit breaker including the same.

[0006] An embodiment of this utility model provides a moving contact system, the moving contact system comprising: a plurality of contact fingers arranged side by side, each contact finger including a contact point disposed on an outer surface; a contact support member including a support plate and a pair of support arms on both sides of the support plate, the first ends of the plurality of contact fingers being pivotally mounted between the pair of support arms; a plurality of springs disposed 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 indicator rod, one end of which is disposed on the inner surface of the first contact finger among the plurality of contact fingers at a position corresponding to the contact point, the other end of which passes through the support plate, the indicator rod moving with the contact finger, and when the contact finger is in the closed position, the other end of the indicator rod extending beyond the support plate.

[0007] In one embodiment, the other end of the indicator rod includes an indicator mark, which extends from the support plate to be visible from the outside when the contact finger is in the closed position, provided that the contact finger is operating normally.

[0008] In one embodiment, as the contact point of the touch finger is ablated, when the touch finger is in the closed position, the length of the other end of the indicator rod extending from the support plate decreases until the indicator mark on the other end of the indicator rod is no longer visible from the outside.

[0009] In one embodiment, the indicator rod includes a base and a rod portion protruding from the base. The base is U-shaped and includes a pair of side wings and a connecting portion between the pair of side wings, the pair of side wings clamping the first touch finger therebetween and abutting a touch finger adjacent to the pair of side wings.

[0010] In one embodiment, the other end of the indicator rod passes through a spring corresponding to the first touch finger, such that one end of the spring abuts against the connecting portion and the other end abuts against the support plate.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] In one embodiment, the protective member and the spacer bracket are formed as an integral structure.

[0015] An embodiment of this utility model provides a circuit breaker, which includes the moving contact system as described above.

[0016] According to an embodiment of the utility model, the moving contact system, by setting an indicator rod at the position corresponding to the contact point of the contact finger, can accurately indicate the overtravel of the circuit breaker after the circuit breaker is closed. Furthermore, the indicator rod passes through the spring, thus serving as a guide rod for the spring, effectively preventing spring deflection during short-term withstand conditions, thereby optimizing short-term withstand capability. In addition, the side wings of the indicator rod can adhere to and maintain synchronous movement with adjacent contact fingers, thereby effectively preventing contact finger deflection under complex magnetic fields, improving short-term withstand performance, and effectively reducing frictional resistance, thus enhancing the durability of the moving contact. Attached Figure Description

[0017] 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:

[0018] Figure 1This is a schematic diagram showing the exploded structure of a moving contact system according to an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram showing a spacer bracket of a moving contact system according to an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram showing the moving contact system in the closed state according to an embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram showing an indicator rod of a moving contact system according to an embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram showing the structure of a circuit breaker according to an embodiment of the present invention. Detailed Implementation

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] Reference Figure 1 and Figure 2 According to one 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 indicator rod 5.

[0028] like Figure 1As shown, multiple contact fingers 1 are arranged side by side and connected in parallel. Each contact finger 1 includes a contact point 13 disposed on its outer surface. For example, the contact point 13 can be a silver dot. The contact support 2 includes a support plate 21 and a pair of support arms 22 on both sides of the support plate 21, with the first ends 11 of the multiple contact fingers 1 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 six contact fingers 1, there are also six springs 4, each corresponding to one of the contact fingers 1. The springs 4 can pass through the through holes 311 in the spacer plate 31 and are thus positioned between the multiple contact fingers 1 and the support plate 21 of the contact support member 2. Figure 2 As shown, one end of the indicator rod 5 is disposed on the inner surface of one of the plurality of contact fingers 1 (e.g., the first contact finger) at a position corresponding to the contact point 13, and the other end extends toward the support plate 21, passing through the through hole 311 in the spacer plate 31 and the through hole 213 in the support plate 21. The indicator rod 5 can move with the contact finger 1. In one embodiment of this disclosure, the six contact fingers 1 can be arranged in two groups, and one indicator rod 5 can be disposed on one contact finger in each group.

[0029] Figure 3 This is a schematic diagram showing a moving contact system according to an embodiment of the present invention in the closed state. Figure 3 As shown, when the contact finger 1 is in the closed position, the other end of the indicator rod 5 passes through the through hole 213 in the support plate 21 and extends out of the support plate 21. Since the indicator rod 5 is set at the position corresponding to the contact point 13 of the contact finger 1 and moves with the contact finger 1, the part of the indicator rod 5 extending out of the support plate 21 can accurately indicate the overtravel of the circuit breaker.

[0030] In one embodiment of this disclosure, the other end of the indicator rod 5 may include an indicator mark, such as a marking line. This indicator mark can indicate the overtravel of the moving contact system. When the contact finger 1 is in the closed position during normal operation, the indicator mark on the other end of the indicator rod 5 can extend beyond the support plate 21 through the through hole 213 in the support plate 21, making it visible from the outside. When the moving contact system is in the closed state and the indicator mark is visible from the outside, the contact point of the indicating contact finger is in a normal state, and the overtravel of the circuit breaker is within a safe range.

[0031] As the contact point 11 of contact finger 1 is continuously eroded, the length of the other end of indicator rod 5 extending from support plate 21 also continuously decreases when contact finger 1 is in the closed position. At this time, the length of the other end of indicator rod 5 extending from support plate 21 can be used to determine that the lifespan of the circuit breaker is continuously shortening. When contact finger 1 is in the closed position and the length of the other end of indicator rod 5 extending from support plate 21 decreases to the point where the indicator mark is no longer visible from the outside, the contact point of the indicator finger has been excessively eroded, resulting in insufficient overtravel of the circuit breaker, and the circuit breaker cannot operate safely.

[0032] Figure 4 This is a schematic diagram illustrating an indicator rod according to an embodiment of the present invention. The indicator rod 5 includes a base 51 and a rod portion 52 protruding from the base 51. The base 51 is U-shaped and includes a pair of side wings 511 and a connecting portion 512 between the pair of side wings 511. The pair of side wings 511 clamp a finger 1 between them and abut against the finger 1 adjacent to the pair of side wings 511. Thus, the side wings of the indicator rod 5 can maintain a uniform gap between the fingers, thereby effectively preventing the fingers from deflecting laterally under complex magnetic fields and optimizing short-term tolerance performance. The rod portion 52 of the indicator rod 5 extends toward the support plate 21, passing through the spring 4 corresponding to the finger 1, the through hole 311 in the spacer plate 31, and the through hole 213 in the support plate 21, such that one end of the spring 4 abuts against the connecting portion 512 of the base 51, and the other end abuts against the support plate 21. When the contact finger 1 is in the closed position, a portion of the rod 52 of the indicator rod 5 passes through the through hole 213 in the support plate 21 and extends beyond the support plate 21. Thus, the indicator rod 5 can function as a guide rod for the spring 4, effectively preventing the spring from deflecting during short-term withstand conditions, thereby preventing a decrease in spring force and optimizing short-term withstand capability. Furthermore, since the indicator rod 5 is pressed against the contact finger 1 by the spring 4, it ensures that the indicator rod 5 and the contact finger 1 move synchronously, effectively reducing frictional resistance and improving the durability of the moving contact.

[0033] 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.

[0034] 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.

[0035] In one embodiment of this disclosure, the moving contact system may include two or more indicator rods 5. The indicator rods 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 indicator rods may be made of plastic.

[0036] Figure 5 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 4 The moving contact system described according to an embodiment of the present invention.

[0037] According to an embodiment of the utility model, the moving contact system, by setting an indicator rod at the position corresponding to the contact point of the contact finger, can accurately indicate the overtravel of the circuit breaker after the circuit breaker is closed. Furthermore, the indicator rod passes through the spring, thus serving as a guide rod for the spring, effectively preventing spring deflection during short-term withstand conditions, thereby optimizing short-term withstand capability. In addition, the side wings of the indicator rod can adhere to and maintain synchronous movement with adjacent contact fingers, thereby effectively preventing contact finger deflection under complex magnetic fields, improving short-term withstand performance, and effectively reducing frictional resistance, thus enhancing the durability of the moving contact.

[0038] 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 contact fingers are arranged side by side, and each contact finger includes a contact point disposed on the outer surface; 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 indicator rod has one end positioned on the inner surface of the first of the plurality of contact fingers at a location corresponding to the contact point, and the other end passing through the support plate. The indicator rod moves with the contact finger. When the contact finger is in the closed position, the other end of the indicator rod extends beyond the support plate.

2. The moving contact system according to claim 1, characterized in that, The other end of the indicator rod includes an indicator mark. When the contact finger is working normally, and the contact finger is in the closed position, the indicator mark on the other end of the indicator rod extends from the support plate to be visible from the outside.

3. The moving contact system according to claim 2, characterized in that, As the contact point of the contact finger is ablated, when the contact finger is in the closed position, the length of the other end of the indicator rod extending from the support plate decreases until the indicator mark on the other end of the indicator rod is no longer visible from the outside.

4. The moving contact system according to claim 1, characterized in that, The indicator rod includes a base and a rod portion protruding from the base. The base is U-shaped and includes a pair of side wings and a connecting portion between the pair of side wings. The pair of side wings sandwich the first finger between them and fit against the finger adjacent to the pair of side wings.

5. The moving contact system according to claim 4, characterized in that, The other end of the indicator rod passes through a spring corresponding to the first touch finger, such that one end of the spring abuts against the connecting part and the other end abuts against the support plate.

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. A circuit breaker, characterized in that, The circuit breaker includes: The moving contact system as described in any one of claims 1-9.

Images