Large throw operating mechanism for miniature circuit breaker

Abstract

The utility model relates to a kind of big opening distance operating mechanism of small circuit breaker, fixed fulcrum is set on movable contact of operating mechanism, operating mechanism is connected in the middle section of movable contact by contact push rod and connecting piece, since the distance of connecting point of connecting piece to fulcrum is less than the distance of contact part to fulcrum, the movement distance of contact part of movable contact is amplified by lever action of movable contact, the movement distance of contact part of movable contact is greater than the lower end moving distance of contact push rod in operating mechanism, the opening distance of movable contact is improved without changing operating mechanism, and big opening distance is realized.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical equipment, specifically a large-opening-distance operating mechanism for a miniature circuit breaker. Background Technology

[0002] Miniature circuit breakers, also known as micro circuit breakers, are mainly used in various places such as industrial, commercial, high-rise and residential buildings. They can be used for overload and short circuit protection of lines, and can also be used for infrequent operation switching of lines under normal conditions.

[0003] To meet the high voltage requirements of the new energy sector, miniature circuit breakers need to improve their breaking distance and arc extinguishing capability. However, due to the compact design of miniature circuit breakers, the existing operating mechanisms control small moving contact opening distances, and the arc extinguishing chambers are small in size with few arc extinguishing grids, making it difficult to achieve high voltage breaking. Summary of the Invention

[0004] To address the aforementioned shortcomings, this utility model provides a small-volume, large-opening-distance operating mechanism for a miniature circuit breaker.

[0005] To achieve the above objectives, this utility model employs a large-opening-distance operating mechanism for a miniature circuit breaker, comprising a handle, a connecting rod, a latch, a trip latch, a contact support, and a moving contact. One end of the moving contact forms a fixed fulcrum, and the other end forms a contact portion. The operating mechanism further includes a contact push rod and a connecting piece. The upper end of the contact push rod is connected to the contact support, and the lower end of the contact push rod is connected to one end of the connecting piece. The other end of the connecting piece is connected to the middle section of the moving contact, pushing the moving contact to swing between the open and closed positions around the fulcrum. The swing distance of the contact portion of the moving contact is longer than the movement distance of the lower end of the contact push rod.

[0006] Specifically, the contact push rod is hinged to the contact support, and a contact spring is provided between the contact support and the contact push rod.

[0007] Specifically, the lower end of the contact support has symmetrical push rod connecting parts on both sides, and the upper end of the contact push rod has two contact connecting pieces, which are respectively hinged in the push rod connecting parts.

[0008] Specifically, the lower end of the contact push rod forms two connecting ends, and there are two connecting pieces. One end of the two connecting pieces is hinged to the two connecting ends, and the other end is hinged to both sides of the moving contact. The connecting pieces are in an upwardly curved arc shape.

[0009] Specifically, the contact spring is a double torsion spring structure, with the middle part of the contact spring connected to the contact support, and the two ends of the contact spring hooked to the outside of the contact connecting piece.

[0010] This invention features a fixed fulcrum on the moving contact. The operating mechanism is connected to the middle section of the moving contact via a contact push rod and a connecting piece. Since the distance from the connection point of the connecting piece to the fulcrum is less than the distance from the contact part to the fulcrum, the lever effect of the moving contact amplifies the movement distance of the contact part of the moving contact, making the movement distance of the contact part of the moving contact greater than the movement distance of the lower end of the contact push rod in the operating mechanism. This increases the breaking distance of the moving contact without changing the operating mechanism, achieving a large opening distance. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of a specific embodiment of the present utility model.

[0012] Figure 2 This is a schematic diagram from another angle of a specific embodiment of the present utility model.

[0013] Figure 3 This is an exploded view of a specific embodiment of this utility model. Detailed Implementation

[0014] like Figures 1-3 As shown, a specific embodiment of this utility model is a large-opening-distance operating mechanism for a miniature circuit breaker, including a handle 1, a connecting rod 11, a latch 2, a trip latch 3, a contact support 4, a moving contact 5, a contact push rod 6, and a connecting piece 7. The handle 1 is connected to the trip latch 3 via the connecting rod 11. The latch 2 and the trip latch 3 are hinged to the contact support 4, and the latch 3 and the trip latch 2 form a locking fit with each other. One end of the moving contact 5 forms a fixed fulcrum, and a fulcrum shaft 51 is inserted through the fulcrum. Both ends of the fulcrum shaft 51 are fixed to the outer casing. The other end of the moving contact 5 forms a contact portion 52. The upper end of the contact push rod 6 is connected to the contact support 4, and the lower end of the contact push rod 6 is connected to one end of the connecting piece 7. The other end of the connecting piece 7 is connected to the middle section of the moving contact 5, which pushes the moving contact 5 to swing around the fulcrum shaft 51 between the open and closed positions. The swing distance of the contact portion 52 of the moving contact 5 is longer than the movement distance of the lower end of the contact push rod 6.

[0015] The lower ends of the contact support 4 are formed with mutually symmetrical push rod connecting parts 41, and the upper ends of the contact push rod 6 are formed with two contact connecting pieces 61, which are respectively hinged in the push rod connecting parts 41.

[0016] The lower end of the contact push rod 6 forms two connecting ends 62. There are two connecting pieces 7. One end of the two connecting pieces 7 is hinged to the two connecting ends 62, and the other end is hinged to both sides of the moving contact 5. The connecting pieces 7 are in an upward curved arc shape.

[0017] The contact push rod 6 is hinged to the contact support 4. A contact spring 8 is provided between the contact support 4 and the contact push rod 6. The contact spring 8 is a double torsion spring structure. The middle part of the contact spring 8 is connected to the contact support 4, and the two ends of the contact spring 8 are hooked to the outside of the contact connecting piece 61.

[0018] The preferred embodiments of the present invention described above are examples of the present invention. Other obvious variations or combinations are also within the scope of protection of the claims.

Claims

1. A large-opening-distance operating mechanism for a miniature circuit breaker, comprising a handle, a connecting rod, a latch, a trip latch, a contact support, and a moving contact, characterized in that: One end of the moving contact forms a fixed fulcrum, and the other end of the moving contact forms a contact portion. The operating mechanism also includes a contact push rod and a connecting piece. The upper end of the contact push rod is connected to the contact support, and the lower end of the contact push rod is connected to one end of the connecting piece. The other end of the connecting piece is connected to the middle section of the moving contact, which pushes the moving contact to swing around the fulcrum between the open and closed positions. The swing distance of the contact portion of the moving contact is longer than the movement distance of the lower end of the contact push rod.

2. The large opening distance operating mechanism of the miniature circuit breaker according to claim 1, characterized in that: The contact push rod is hinged to the contact support, and a contact spring is provided between the contact support and the contact push rod.

3. The large opening distance operating mechanism of the miniature circuit breaker according to claim 2, characterized in that: The lower end of the contact support forms symmetrical push rod connecting parts on both sides, and the upper end of the contact push rod forms two contact connecting pieces, which are respectively hinged in the push rod connecting parts.

4. The large opening distance operating mechanism of the miniature circuit breaker according to claim 3, characterized in that: The lower end of the contact push rod forms two connecting ends. There are two connecting pieces. One end of the two connecting pieces is hinged to the two connecting ends, and the other end is hinged to both sides of the moving contact. The connecting pieces are in an upwardly curved arc shape.

5. The large opening distance operating mechanism of the miniature circuit breaker according to claim 3, characterized in that: The contact spring is a double torsion spring structure. The middle part of the contact spring is connected to the contact support, and the two ends of the contact spring are hooked to the outside of the contact connecting piece.

Images