A movable contact part and circuit breaker

Abstract

This invention discloses a moving contact portion and a circuit breaker, including a contact support and an arc-blocking cover mounted on the contact support. The arc-blocking cover is curved in an arc shape. The center of the arc-blocking cover is defined as O1, and the rotation center of the contact support is defined as O2. O1 is configured to face towards O2 and offset relative to O2 in the opening direction of the moving contact portion. Because O1 is facing towards O2 and offset relative to O2 in the opening direction of the moving contact portion, the high-voltage force acting on the arc-blocking cover will generate a component force pushing the contact support in its opening direction, thereby improving the opening speed and enhancing the breaking performance.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, and specifically to a moving contact part and a circuit breaker. Background Technology

[0002] In existing circuit breakers, an arc-blocking cover is typically installed on the contact support of the moving contact. The arc-blocking cover is configured to extend towards the stationary contact relative to the moving contact, and a clearance groove is provided on the circuit breaker base plate. When the moving contact and stationary contact are closed, the arc-blocking cover is embedded in the clearance groove on the base plate. When the moving contact performs an opening action relative to the stationary contact, the arc-blocking cover prevents the arc from moving downward away from the arc-extinguishing chamber. However, due to structural limitations, the existing arc-blocking cover has a relatively simple function, generally only providing arc isolation. This has limitations in applications requiring miniaturization and high breaking capacity. Furthermore, to ensure smooth operation, the center of the existing arc-shaped arc-blocking cover is usually configured to coincide with the rotation center of the contact support. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a moving contact part, which mainly solves the technical problem of the single function of existing arc-blocking covers.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution: A moving contact portion includes a contact support, on which an arc-blocking cover is mounted. The arc-blocking cover is curved in an arc shape. The center of the arc-blocking cover is defined as O1, and the rotation center of the contact support is defined as O2. O1 is configured to face towards O2 and offset relative to O2 in the opening direction of the moving contact portion.

[0005] Furthermore, the arc shield is an arc shield structure made of nylon.

[0006] Furthermore, the top of the arc-blocking shield is provided with several guide grooves extending along the opening and closing direction of the moving contact part to suppress the transformation of surface turbulent airflow into turbulent flow.

[0007] Based on the same inventive concept, the present invention also provides a circuit breaker, including a base, a bottom plate, a stationary contact portion and the aforementioned moving contact portion, wherein the moving contact portion is mounted on the base and the stationary contact portion is mounted on the bottom plate.

[0008] Furthermore, the base and bottom plate are equipped with arc-extinguishing chambers corresponding to the moving and stationary contact parts at the upper end. A gas-generating plate is installed on each side of the arc-extinguishing chamber. Several protruding ribs are provided on the inner sidewalls of the two gas-generating plates to increase the gas-generating area.

[0009] Furthermore, the ribs extend vertically on the inner wall of the gas-generating plate and are arranged at intervals in the transverse direction, and a guide groove is formed between adjacent ribs in the direction of arc movement to suppress the transformation of surface turbulent airflow into turbulent flow.

[0010] Furthermore, a Laval channel structure is formed between the inner sidewalls of the two gas-producing plates.

[0011] Furthermore, the gas-generating plate is a gas-generating plate structure made of nylon.

[0012] Furthermore, a corresponding arc-blocking cover is provided on the base plate to allow the moving contact part and the stationary contact part to close normally. When the arc-blocking cover is embedded in the avoidance groove, the arc-blocking cover and the inner wall of the avoidance groove cooperate with each other to form a sealing effect.

[0013] The above technical solution has the following advantages or beneficial effects: In the moving contact portion and circuit breaker described in this invention, by configuring O1 to face towards O2 and offset relative to O2 towards the opening direction of the moving contact portion, the top of the arc-blocking cover will be subjected to high voltage during opening. When the high voltage acts on the arc-shaped arc-blocking cover, it will generate a force pointing towards O1. Since O1 faces towards O2 and is offset relative to O2 towards the opening direction of the moving contact portion, the high voltage force acting on the arc-blocking cover will generate a component force pushing the contact support in the opening direction, thereby improving the opening speed and breaking performance. Furthermore, without significantly changing the dimensions and specifications of the arc-blocking cover, the arc-blocking function is achieved while simultaneously promoting the opening action of the moving contact portion. This satisfies the requirements of product miniaturization design and enhances the functionality of the arc-blocking cover, achieving multiple benefits. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the movable contact portion according to an embodiment of the present invention.

[0015] Figure 2 This is an exploded three-dimensional structural diagram of the moving contact portion according to an embodiment of the present invention.

[0016] Figure 3 This is a partial structural diagram of the contact support according to an embodiment of the present invention.

[0017] Figure 4 This is a schematic diagram of the force applied to the arc-blocking shield according to an embodiment of the present invention.

[0018] Figure 5 This is an exploded three-dimensional structural diagram of the circuit breaker according to an embodiment of the present invention.

[0019] Figure 6 This is a structural cross-sectional view of the circuit breaker according to an embodiment of the present invention.

[0020] Figure 7 This is a schematic diagram of the internal structure of the circuit breaker according to an embodiment of the present invention.

[0021] Labeling explanation: 1. Moving contact part, 2. Static contact part, 3. Base, 4. Base plate, 5. Arc extinguishing chamber, 11. Contact support, 12. Arc isolation cover, 41. Avoidance groove, 51. Gas generation plate, 121. First guide groove, 511. Protruding rib, 512. Second guide groove. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] Please refer to the appendix. Figure 1 To be continued Figure 7 An embodiment of the present invention provides a moving contact portion applied in a circuit breaker, including a contact support 11, an arc-blocking cover 12 mounted on the contact support 11, the arc-blocking cover 12 being in an arc-shaped bend, the center of the arc-blocking cover 12 being defined as O1, the rotation center of the contact support 11 being defined as O2, and O1 being configured to face towards the side of O2 and offset relative to O2 towards the opening direction of the moving contact portion (the offset distance between O1 and O2 is d). Understandably, in this embodiment, by configuring O1 to face O2 and offset relative to O2 towards the opening direction of the moving contact, the top of the arc-blocking cover 12 will be subjected to high pressure during opening (due to the gas generation plate of the arc-extinguishing chamber and the arc combustion, the pressure in the top space of the arc-blocking cover 12 surges). When the high pressure acts on the arc-shaped arc-blocking cover 12, it will generate a force pointing towards O1. Since O1 faces O2 and is offset relative to O2 towards the opening direction of the moving contact, the high pressure force acting on the arc-blocking cover 12 will generate a component force pushing the contact support 11 towards its opening direction, thereby improving the opening speed and breaking performance. Furthermore, without significantly changing the dimensions of the arc-blocking cover 12, it achieves the arc-blocking function while simultaneously promoting the opening action of the moving contact, satisfying the miniaturization design requirements of the product and improving the functionality of the arc-blocking cover 12—achieving multiple benefits in one fell swoop.

[0025] Please refer to the appendix. Figure 1 To be continued Figure 7In one preferred embodiment, the arc shield 12 is a nylon arc shield structure made of PA66, PA66+25%GF, POM, melamine, or PA46. However, those skilled in the art will understand that in other embodiments, the arc shield 12 can also be made of other materials with gas-generating effects, and is not limited to the specific implementation disclosed in this embodiment. Gas generation by the arc shield 12 facilitates the rapid upward movement of the arc root and cools the arc, reducing ionization.

[0026] Please refer to the appendix. Figure 1 To be continued Figure 7 In one preferred embodiment, the top of the arc-blocking shield 12 is provided with a plurality of first guide grooves 121 extending along the opening and closing direction of the moving contact portion 1 to suppress the transformation of surface turbulent airflow into turbulent flow. By opening the first guide grooves 121 on the top surface of the arc-blocking shield 12, its surface becomes an uneven structure, which on the one hand increases the gas generation area and improves the air blowing power, and on the other hand suppresses the transformation of surface turbulence into turbulence, so that the electric arc flows along the extension direction of the first guide grooves 121, thereby facilitating the smooth entry of the electric arc into the arc-extinguishing chamber. In addition, the arc-shaped arc-blocking shield 12 is fixedly connected to the contact support 11 through an integrally formed connecting bracket structure.

[0027] Please refer to the appendix. Figure 1 To be continued Figure 7 An embodiment of the present invention also provides a circuit breaker, including a base 3, a base plate 4, a stationary contact portion 2 and a moving contact portion 1 as described in any one of claims 1 to 3, wherein the moving contact portion 1 is mounted on the base 3 and the stationary contact portion 2 is mounted on the base plate 4.

[0028] Please refer to the appendix. Figure 1 To be continued Figure 7 In one preferred embodiment, an arc-extinguishing chamber 5 corresponding to the moving contact portion 1 and the stationary contact portion 2 is also installed at the upper end of the base 3 and the bottom plate 4. A gas-generating plate 51 is installed on each side of the arc-extinguishing chamber 5. Several protruding ribs 511 are provided on the inner sidewalls of the two gas-generating plates 51 to increase the gas-generating area. In this embodiment, preferably, the ribs 511 extend vertically on the inner sidewalls of the gas-generating plates 51 and are arranged at intervals in the transverse direction. A second guide groove 512 is formed between adjacent ribs 511, arranged in the direction of arc movement to suppress the transformation of surface turbulent airflow into turbulent flow.

[0029] Please refer to the appendix. Figure 1 To be continued Figure 7In one preferred embodiment, a Laval channel structure is formed between the opposing inner sidewalls of the two gas-generating plates 51. The gas-generating plates 51 are nylon gas-generating plate structures made of PA66, PA66+25%GF, POM, melamine, or PA46. However, those skilled in the art will understand that in other embodiments, the gas-generating plates 51 may also be made of other existing gas-generating materials, and are not limited to the specific implementation methods disclosed in this embodiment.

[0030] Please refer to the appendix. Figure 1 To be continued Figure 7 In one preferred embodiment, a corresponding arc-blocking cover 12 is provided on the base plate 4 to allow the moving contact part 1 and the stationary contact part 2 to close normally. When the arc-blocking cover 12 is embedded in the avoidance groove 41, the arc-blocking cover 12 and the inner wall of the avoidance groove 41 cooperate with each other to form a sealing effect. In this embodiment, a seal is formed by the mutual cooperation between the arc-isolating cover 12 and the clearance groove 41 of the base plate 4 (this seal is not an absolute seal; since the arc-isolating cover 12 needs to move relative to the base plate 4, a corresponding clearance needs to be reserved between the two so that the arc-isolating cover 12 will not cause unnecessary resistance to the movement of the contact support 11, so as not to affect the normal opening and closing operation of the moving contact part. At the same time, since O1 and O2 are offset, the clearance groove 41 also needs to be specially designed according to the specific movement trajectory of the arc-isolating cover 12 so that it can meet the sealing requirements without causing unnecessary interference to the movement of the moving contact part 1). This isolates the arc-extinguishing chamber area from the lower area (non-contact area) of the circuit breaker. During the opening process, due to the sealing effect of the arc-isolating cover 12, the arc is pushed into the arc-extinguishing chamber through the airflow reflection effect, thereby improving the problem of arc movement difficulty caused by the non-sealing of the lower area of ​​the existing circuit breaker.

[0031] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features therein. These modifications or substitutions do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. Therefore, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

Claims

1. A movable contact part, characterized in that: It includes a contact support, on which an arc-blocking cover is installed. The arc-blocking cover is curved in an arc shape. The center of the arc-blocking cover is defined as O1, and the rotation center of the contact support is defined as O2. O1 is configured to face the side of O2 and be biased relative to O2 in the opening direction of the moving contact part.

2. The movable contact portion according to claim 1, characterized in that: The arc shield is made of PA66 material, PA66+25%GF material, POM material, or melamine material.

3. The movable contact portion according to claim 2, characterized in that: The top of the arc-blocking shield is provided with several guide grooves that extend along the opening and closing direction of the moving contact part to suppress the transformation of surface turbulent airflow into turbulent flow.

4. A circuit breaker, comprising a base, a bottom plate, a stationary contact portion, and a moving contact portion as described in any one of claims 1 to 3, wherein, The moving contact part is mounted on the base, and the stationary contact part is mounted on the bottom plate.

5. The circuit breaker according to claim 4, characterized in that: The base and bottom plate are also equipped with arc-extinguishing chambers corresponding to the moving and stationary contact parts. A gas-generating plate is installed on each side of the arc-extinguishing chamber. Several protruding ribs are provided on the inner sidewalls of the two gas-generating plates to increase the gas-generating area.

6. The circuit breaker according to claim 5, characterized in that: The ribs extend vertically on the inner wall of the gas-generating plate and are spaced apart from each other in the transverse direction. A guide groove is formed between adjacent ribs, which is arranged in the direction of arc movement to suppress the transformation of surface turbulent airflow into turbulent flow.

7. The circuit breaker according to claim 5, characterized in that: A Laval channel structure is formed between the inner sidewalls of the two gas-producing plates.

8. The circuit breaker according to claim 5, characterized in that: The gas-generating plate is made of PA66 material, PA66+25%GF material, POM material, or melamine material.

9. The circuit breaker according to claim 4, characterized in that: A corresponding arc-blocking cover is provided on the base plate so that the moving contact part and the stationary contact part can close normally. When the arc-blocking cover is embedded in the avoidance groove, the arc-blocking cover and the inner wall of the avoidance groove cooperate with each other to form a sealing effect.

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