A moving contact bridge repulsion and locking structure and a double-break circuit breaker

Abstract

This utility model discloses a moving contact bridge repulsion and locking structure and a double-break circuit breaker, including a rotor base and a moving contact bridge rotatably connected to the rotor base. The moving contact bridge has an abutment portion, and a torsion spring is mounted on the rotor base. The torsion spring has a first end that elastically abuts against the rotor base and a second end that elastically abuts against the abutment portion. The second end includes a first extension and a second extension, with a bending inflection point between the first and second extensions to make the second extension bend relative to the first extension. In this utility model, the first and second ends of the torsion spring elastically abut against the corresponding rotor base and abutment portion, respectively. Even after repeated operations, the mating parts are less prone to wear leading to torsion spring failure, which helps improve the stability and reliability of the product.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, specifically to a moving contact bridge repulsion and locking structure and a double-break circuit breaker. Background Technology

[0002] Currently, the contact mechanism of a molded case double-break circuit breaker typically consists of a rotor base, a moving contact bridge, a stationary contact bridge, a moving contact bridge tension spring, and a locking device. It utilizes the electrodynamic repulsion force generated by a large short-circuit fault current to quickly separate the moving and stationary contact bridges, and the locking device automatically locks them to prevent the moving contact bridge from falling, thus achieving rapid interruption of fault current and current-limiting protection. However, in existing contact mechanisms, one end of the moving contact bridge tension spring is attached to the moving contact bridge, while the other end is attached to the tension spring shaft of the rotor base. After repeated operation of the contact mechanism, the contact surface between the moving contact bridge tension spring and the tension spring shaft suffers severe wear, potentially leading to functional failure of the contact mechanism. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a moving contact bridge repulsion and locking structure, which mainly solves the technical problem that after repeated operation of the contact mechanism of existing molded case double-break circuit breakers, the contact surface between the moving contact bridge tension spring and the tension spring shaft is severely worn, which may lead to the risk of functional failure of the contact mechanism.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0005] A movable contact bridge repulsion and locking structure includes a rotor base and a movable contact bridge rotatably connected to the rotor base. The movable contact bridge is provided with an abutment portion, and a torsion spring is installed on the rotor base. The torsion spring has a first end that elastically abuts against the rotor base and a second end that elastically abuts against the abutment portion. The second end includes a first extension and a second extension. There is a bending inflection point between the first extension and the second extension so that the second extension is bent relative to the first extension. When the movable contact bridge moves to a closed position relative to the rotor base, the abutment portion is configured to abut against the first extension and the torsion spring generates a closing holding force on the movable contact bridge. When the movable contact bridge moves away from the rotor base to a split position under the action of an external force and the abutment portion passes the bending inflection point, the abutment portion is configured to abut against the second extension and the torsion spring generates a repulsion and locking force on the movable contact bridge.

[0006] Furthermore, the second extension is configured to bend inward relative to the first extension towards the center of the torsion spring.

[0007] Furthermore, the bending angle between the second extension segment and the first extension segment is 120° to 150°.

[0008] Furthermore, a waist-shaped long slot is provided at the center of the moving contact bridge, and a central shaft is provided at the center of the rotor seat. Through the cooperation between the waist-shaped long slot and the central shaft, the moving contact bridge is rotatably connected to the rotor seat.

[0009] Furthermore, at least one pair of contact parts are provided on the moving contact bridge, which are arranged symmetrically with respect to the rotation center of the moving contact bridge.

[0010] Furthermore, two pairs of abutting structures are provided on the moving contact bridge. Each pair of abutting structures consists of two abutting parts arranged symmetrically on the moving contact bridge. The two pairs of abutting structures are respectively arranged opposite to each other on the two sides of the moving contact bridge, and four torsion springs that cooperate with each abutting part are provided on the rotor seat.

[0011] Furthermore, two centrally symmetrically arranged limiting shafts are provided on the rotor base, and four torsion springs are respectively sleeved on the corresponding limiting shafts in pairs. When the moving contact bridge rotates relative to the rotor base to the disconnected state position, the moving contact bridge abuts against the two limiting shafts, thereby limiting the repulsion stroke of the moving contact bridge by the limiting shafts.

[0012] Furthermore, the contact part is a shaft structure located on the side of the moving contact bridge.

[0013] Furthermore, both the first extension section and the second extension section engage with the contacting part through line contact.

[0014] Based on the same inventive concept, this utility model also provides a double-break circuit breaker, including the above-mentioned moving contact bridge repulsion and locking structure.

[0015] The above technical solution has the following advantages or beneficial effects:

[0016] In the moving contact bridge repulsion and locking structure and double-break circuit breaker described in this utility model, a torsion spring structure is used instead of the existing tension spring structure. On the one hand, the torsion spring is smaller in size than the tension spring. On the other hand, the first and second ends of the torsion spring are elastically engaged with the corresponding rotor seat and the contact part, respectively. After multiple operations, the engaging parts are not prone to wear and tear that could cause the torsion spring to fail, which helps to improve the stability and reliability of the product. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the moving contact bridge repulsion and locking structure in the closed state of this utility model embodiment.

[0018] Figure 2 This is a schematic diagram of the internal engagement structure of the moving contact bridge repulsion and locking structure in the closed state of this utility model embodiment.

[0019] Figure 3This is a three-dimensional structural diagram of the moving contact bridge repulsion and locking structure in the broken state of the moving contact bridge according to an embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram of the internal engagement structure of the moving contact bridge repulsion and locking structure in the broken state of the moving contact bridge according to an embodiment of the present invention.

[0021] Figure 5 This is a three-dimensional structural schematic diagram of the moving contact bridge according to an embodiment of the present invention.

[0022] Figure 6 This is a three-dimensional structural diagram of the rotor seat according to an embodiment of the present invention.

[0023] Figure 7 This is a schematic diagram of the cooperation structure between the moving contact bridge and the torsion spring in an embodiment of this utility model.

[0024] Label Explanation:

[0025] 1. Rotor seat, 2. Moving contact bridge, 3. Torsion spring, 11. Central shaft, 12. Limiting shaft, 21. Contact part, 22. Waist-shaped long groove, 31. First end, 32. Second end, 321. First extension section, 322. Second extension section, 323. Bend point. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] In the description of this utility model, 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 utility model 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 utility model.

[0028] Please refer to the appendix. Figure 1 To be continued Figure 7One embodiment of this utility model provides a moving contact bridge repulsion and locking structure, including a rotor base 1 and a moving contact bridge 2 rotatably connected to the rotor base 1. The moving contact bridge 2 is provided with an abutment portion 21. A torsion spring 3 is installed on the rotor base 1. The torsion spring 3 has a first end 31 that elastically abuts against the rotor base 1 and a second end 32 that elastically abuts against the abutment portion 21. The second end 32 includes a first extension section 321 and a second extension section 322. A bending inflection point 323 is located between the first extension section 321 and the second extension section 322. The second extension 322 is bent relative to the first extension 321. When the moving contact bridge 2 moves relative to the rotor seat 1 to the closed position, the abutment part 21 is configured to abut against the first extension 321, causing the torsion spring 3 to generate a closing holding force on the moving contact bridge 2. When the moving contact bridge 2 moves away from the rotor seat 1 to the open position under the action of external force, and the abutment part 21 passes the bending inflection point 323, the abutment part 21 is configured to abut against the second extension 322, causing the torsion spring 3 to generate a repulsive locking force on the moving contact bridge 2. It can be understood that in this embodiment, a torsion spring structure is used instead of the existing tension spring structure. On the one hand, the torsion spring is smaller in size than the tension spring. On the other hand, the first end 31 and the second end 32 of the torsion spring 3 are elastically engaged with the corresponding rotor seat 1 and the abutment part 21, respectively. After multiple operations, the engaging parts are not prone to wear leading to torsion spring failure, which is beneficial to improving the stability and reliability of the product.

[0029] Please refer to the appendix. Figure 1 To be continued Figure 7 In one preferred embodiment, the first extension 321 and the second extension 322 engage with the contact portion 21 through line contact. Existing contact mechanisms typically have a mounting groove on the moving contact bridge to allow the tension spring to stably engage with it. This ensures that the mounting end of the tension spring is always in close contact with the moving contact bridge. However, the moving contact bridge reaches a high temperature when energized, and this high temperature is conducted to the tension spring through the mounting area. This high temperature affects the lifespan of the tension spring and reduces its force, resulting in lower contact pressure between the contacts. Lower contact pressure leads to increased circuit resistance, which in turn increases the temperature rise of the moving contact bridge, creating a vicious cycle that affects the product's lifespan. In this embodiment, due to the elastic abutment characteristics of the torsion spring, the first extension 321 and the second extension 322 of its second end 32 can make line contact with the abutment part 21, which effectively reduces the contact area between the torsion spring 3 and the moving contact bridge 2, thereby improving the influence of the high temperature conduction of the moving contact bridge 2 on the force value of the torsion spring 3 and helping to ensure the contact pressure between the contacts.

[0030] Please refer to the appendix. Figure 2In one preferred embodiment, the second extension 322 is configured to bend inward relative to the first extension 321 toward the center of the torsion spring 3. Preferably, the bending angle between the second extension 322 and the first extension 321 is 120° to 150° (the bending angle between the second extension 322 and the first extension 321 when the moving contact bridge is closed). However, those skilled in the art should understand that in other embodiments, the bending angle between the second extension 322 and the first extension 321 is not limited to the specific implementation disclosed in this embodiment. As long as the moving contact bridge 2 moves relative to the rotor seat 1 to the closed position, the abutting part 21 abuts against the first extension 321 and the torsion spring 3 generates a closing holding force on the moving contact bridge 2, and when the moving contact bridge 2 moves relative to the rotor seat 1 to the open position under the action of external force and the abutting part 21 passes the bending inflection point 323, the abutting part 21 abuts against the second extension 322 to change the direction of the elastic force and the torsion spring 3 generates a repulsive and locking force on the moving contact bridge 2, it is acceptable.

[0031] Please refer to the appendix. Figure 1 To be continued Figure 7 In one preferred embodiment, at least one pair of abutment portions 21 are provided on the movable contact bridge 2, symmetrically arranged around the rotation center of the movable contact bridge 2. Preferably, two pairs of abutment structures are provided on the movable contact bridge 2, each pair consisting of two abutment portions 21 symmetrically arranged on the movable contact bridge 2. The two pairs of abutment structures are respectively arranged opposite to each other on the two sides of the movable contact bridge 2, and four torsion springs 3 are provided on the rotor seat 1, each cooperating with one of the abutment portions 21. Further, two centrally symmetrical limiting shafts 12 are provided on the rotor seat 1, and the four torsion springs 3 are respectively sleeved on the corresponding limiting shafts 12 in pairs. When the movable contact bridge 2 rotates relative to the rotor seat 1 to the broken state position, the movable contact bridge 2 abuts against the two limiting shafts 12, thereby limiting the repulsive stroke of the movable contact bridge 2 by the limiting shafts 12. However, those skilled in the art should understand that in other embodiments, the number and arrangement of torsion springs 3 are not limited to the specific implementation disclosed in this embodiment, and those skilled in the art can make adaptive changes to the design according to specific needs.

[0032] Please refer to the appendix. Figure 5 In one preferred embodiment, the abutment portion 21 is a shaft structure located on the side of the movable contact bridge 2. However, those skilled in the art will understand that in other embodiments, the abutment portion 21 may also be a convex shaft structure that is integrally formed or detachably connected to the movable contact bridge 2 and can make line contact abutment with the second end 32 of the torsion spring 3.

[0033] Please refer to the appendix. Figure 5 To be continued Figure 7In one preferred embodiment, a waist-shaped long groove 22 is provided at the center of the moving contact bridge 2, and a central shaft 11 is provided at the center of the rotor seat 1. Through the mutual cooperation between the waist-shaped long groove 22 and the central shaft 11, the moving contact bridge 2 is rotatably connected to the rotor seat 1.

[0034] Please refer to the appendix. Figure 1 To be continued Figure 7 Furthermore, existing tension springs have large overall volume and are relatively close to the moving contacts at both ends of the moving bridge 2. This results in a large exposed surface area, making them susceptible to short-circuit arc erosion. In contrast, the torsion spring 3 is small in size and positioned at a relatively large distance from the moving contacts at both ends of the moving bridge 2. Compared to the existing tension spring structure, its exposed surface is relatively small and the distance is large, making it less susceptible to short-circuit arc erosion and improving product reliability.

[0035] Please refer to the appendix. Figure 1 To be continued Figure 7 An embodiment of this utility model also provides a double-break circuit breaker, including the above-mentioned moving contact bridge repulsion and locking structure.

[0036] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model 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. 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 this utility model. Therefore, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. A moving contact bridge repulsion locking structure, characterized by: The device includes a rotor base (1) and a movable contact bridge (2) rotatably connected to the rotor base (1). The movable contact bridge (2) is provided with an abutment part (21). A torsion spring (3) is installed on the rotor base (1). The torsion spring (3) has a first end (31) that elastically abuts against the rotor base (1) and a second end (32) that elastically abuts against the abutment part (21). The second end (32) includes a first extension section (321) and a second extension section (322). There is a bending inflection point (323) between the first extension section (321) and the second extension section (322) so that the second extension section (322) can be bent. The moving contact bridge (2) is bent relative to the first extension section (321). When the moving contact bridge (2) moves to the closed position relative to the rotor seat (1), the abutment part (21) is configured to abut against the first extension section (321) and the torsion spring (3) generates a closing holding force on the moving contact bridge (2). When the moving contact bridge (2) moves away from the rotor seat (1) to the open position under the action of external force and the abutment part (21) passes the bending inflection point (323), the abutment part (21) is configured to abut against the second extension section (322) and the torsion spring (3) generates a repulsive blocking force on the moving contact bridge (2).

2. The movable contact bridge repulsion locking structure according to claim 1, characterized in that: The second extension (322) is configured to bend inward relative to the first extension (321) toward the center of the torsion spring (3).

3. The movable contact bridge repulsion locking structure according to claim 2, characterized in that: The bending angle between the second extension segment (322) and the first extension segment (321) is 120° to 150°.

4. The movable contact bridge repulsive locking structure according to claim 1, characterized in that: A waist-shaped long groove (22) is provided at the center of the moving contact bridge (2), and a central shaft (11) is provided at the center of the rotor seat (1). Through the mutual cooperation of the waist-shaped long groove (22) and the central shaft (11), the moving contact bridge (2) is rotatably connected to the rotor seat (1).

5. The movable contact bridge repulsion locking structure according to claim 1, characterized in that: At least one pair of contact parts (21) are provided on the movable contact bridge (2) with the rotation center of the movable contact bridge (2) as the center of symmetry and arranged in a centrally symmetrical manner on the movable contact bridge (2).

6. The movable contact bridge repulsion locking structure according to claim 5, characterized in that: Two pairs of contact structures are provided on the moving contact bridge (2). Each pair of contact structures consists of two contact parts (21) arranged symmetrically on the moving contact bridge (2). The two pairs of contact structures are respectively arranged on the two sides of the moving contact bridge (2). Four torsion springs (3) are provided on the rotor seat (1) to cooperate with each contact part (21).

7. The movable contact bridge repulsion locking structure according to claim 6, characterized in that: Two centrally symmetrical limiting shafts (12) are provided on the rotor seat (1). Four torsion springs (3) are respectively sleeved on the corresponding limiting shafts (12) in pairs. When the moving contact bridge (2) rotates relative to the rotor seat (1) to the disconnected state position, the moving contact bridge (2) abuts against the two limiting shafts (12), and the limiting shafts (12) limit the repulsion stroke of the moving contact bridge (2).

8. The movable contact bridge repulsion locking structure according to claim 1, characterized in that: The contact part (21) is a shaft structure located on the side of the moving contact bridge (2).

9. The moving contact bridge repulsion and locking structure according to any one of claims 1 to 8, characterized in that: When the first extension section (321) and the second extension section (322) abut against the contact part (21), they are both in a line contact abutment fit.

10. A double-break circuit breaker characterized by: Includes the moving contact bridge repulsion and locking structure as described in any one of claims 1 to 9.

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