Direct-current miniature circuit breaker

Abstract

The utility model discloses a direct-current miniature circuit breaker which is small in size and good in stability. According to the technical scheme, the tripping device comprises a shell and a tripping mechanism arranged in the shell, the tripping mechanism comprises a support, a lock catch in shaft connection with the middle of the support and a jump pin in shaft connection with the top of the support, the bottom of the support is in shaft connection with a moving contact, the upper end of the moving contact is connected with a tension spring, the other end of the tension spring is connected to the shell, and the shell is connected with the jump pin. The upper end of the shell is in shaft connection with a handle, the handle is connected with the jump pin through a U-shaped connecting rod, a convex rib is integrally formed at the lower right corner of the handle, a shaft hole extending axially is formed in the convex rib, and the end part of the U-shaped connecting rod is connected in the shaft hole.

Description

Technical Field

[0001] The utility model belongs to the field of low-voltage electrical appliances, and in particular relates to a small circuit breaker. Background Art

[0002] A DC miniature circuit breaker is an overcurrent protection device used in DC systems, primarily for overload and short-circuit protection of DC lines. The structure of a conventional miniature circuit breaker is shown in the Chinese utility model patent application number "CN 215988635 U," entitled "A Miniature Circuit Breaker." The structure comprises a housing and a tripping mechanism housed within the housing. The tripping mechanism includes a bracket, a locking latch pivotally connected to the middle of the bracket, and a tripping latch pivotally connected to the top of the bracket. A moving contact is pivotally connected to the bottom of the bracket, with a tension spring attached to the upper end of the moving contact. The other end of the tension spring is connected to the housing. A handle is pivotally connected to the upper end of the housing and connected to the tripping latch via a U-shaped connecting rod. Rotating the handle from left to right drives the U-shaped connecting rod, resetting the tripping mechanism. This structure requires a long U-shaped connecting rod, and the handle must be mounted on the side of the upper end of the housing, which increases the overall size and reduces stability. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a small DC miniature circuit breaker with small size and good stability.

[0004] In order to solve the above problems, the technical solution adopted by the present invention includes: a shell and a tripping mechanism arranged in the shell, the tripping mechanism includes a bracket, a lock buckle axially connected to the middle part of the bracket, and a jump buckle axially connected to the top of the bracket, a moving contact is axially connected to the bottom of the bracket, the upper end of the moving contact is connected to a tension spring, the other end of the tension spring is connected to the shell, the upper end of the shell is axially connected to a handle, and the handle is connected to the jump buckle through a U-shaped connecting rod, which is characterized in that a convex rib is integrally formed with a lower right corner of the handle, an axially extending axial hole is provided on the rib, the end of the U-shaped connecting rod is connected to the axial hole, the handle is axially connected to the middle part of the shell, and when the handle rotates, the U-shaped connecting rod pushes the tripping mechanism to reset.

[0005] The DC miniature circuit breaker is characterized in that the convex rib is integrally formed at a 90° position on the lower right corner of the handle.

[0006] The DC miniature circuit breaker is characterized in that a first torsion spring is provided on the lock, a first force arm of the first torsion spring acts on the first force arm connecting column at the upper end of the bracket, and a second force arm acts on the second force arm connecting column at the lower end of the lock.

[0007] The DC miniature circuit breaker is characterized in that a second torsion spring is provided on the trip button, a third force arm of the second torsion spring acts on the third force arm connecting column at the upper end of the trip button, and a fourth force arm acts on the first force arm connecting column.

[0008] The DC miniature circuit breaker is characterized in that a limiting groove with a 45° angle is provided on the housing, and the handle rotates in the limiting groove.

[0009] The DC miniature circuit breaker is characterized in that a lock hole is provided in the middle of the housing corresponding to the limiting groove.

[0010] The DC miniature circuit breaker is characterized in that an indicator piece is connected to the inner shaft of the housing, and the lower end of the indicator piece is connected to the connecting shaft on the bracket through a waist-shaped hole.

[0011] The DC miniature circuit breaker is characterized in that a positioning step is provided at the upper end of the handle corresponding to the rib.

[0012] The advantages of the DC miniature circuit breaker of the present invention are as follows: a convex rib is integrally formed at the lower right corner of the handle, one end of the U-shaped connecting rod is connected to the axial hole of the convex rib, and the other end is connected to the tripping buckle, so that the handle can be axially connected to the middle of the shell and rotated from right to left to drive the U-shaped connecting rod to push the tripping mechanism to reset, thereby reducing the length of the U-shaped connecting rod and the volume of the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below with reference to the accompanying drawings.

[0014] Figure 1 This is a structural diagram of a DC miniature circuit breaker of the utility model;

[0015] Figure 2 It is a structural diagram of the tripping mechanism of the utility model;

[0016] Figure 3 It is an exploded view of the tripping mechanism of the utility model;

[0017] Figure 4 It is a structural schematic diagram of the housing of the utility model;

[0018] Figure 5 It is a structural diagram of the handle of the utility model. DETAILED DESCRIPTION

[0019] Reference Figures 1 to 5As shown, the DC miniature circuit breaker of the present invention includes a housing 1 and a tripping mechanism 2 arranged in the housing 1. The tripping mechanism 2 includes a bracket 3, a lock 4 axially connected to the middle part of the bracket 3, and a tripping catch 5 axially connected to the top of the bracket 3. A moving contact 6 is axially connected to the bottom of the bracket 3, and a tension spring 7 is connected to the upper end of the moving contact 6, and the other end of the tension spring 7 is connected to the housing 1. The bracket 3 and the lock 4 are connected by a long axis 27, and the two ends of the long axis 27 are connected to the housing 1, so that when the tripping catch 5 is pushed, the tripping mechanism 2 can rotate along the long axis 27. A handle 8 is axially connected to the upper end of the housing 1. The handle 8 is connected to the tripping catch 5 through a U-shaped connecting rod 9. A convex rib 10 is integrally formed at the lower right corner of the handle 8, and an axially extending shaft hole 11 is provided on the convex rib 10. The end of the U-shaped connecting rod 9 is rotatably connected to the shaft hole 11. The handle 8 is axially connected to the middle of the housing 1 , and when the handle 8 rotates from left to right, the U-shaped connecting rod 9 pushes the tripping mechanism 2 to reset.

[0020] Preferably, the rib 10 is integrally formed at a 45° angle to the lower right corner of the handle 8. The housing 1 is also provided with a 90° retaining groove 21, within which the handle 8 rotates. This allows the U-shaped connecting rod 9 to be horizontal when the handle 8 is in the open position, making it easier and faster for the U-shaped connecting rod 9 to push the trip mechanism 2 during a reset operation.

[0021] Preferably, the lock catch 4 is provided with a first torsion spring 12, wherein a first lever 13 of the first torsion spring 12 acts on a first lever connecting post 14 at the upper end of the bracket 3, and a second lever 15 of the first torsion spring 12 acts on a second lever connecting post 16 at the lower end of the lock catch 4. A second torsion spring 17 is provided on the tripping catch 5, wherein a third lever 18 of the second torsion spring 17 acts on a third lever connecting post 19 at the upper end of the tripping catch 5, and a fourth lever 20 of the second torsion spring 17 acts on the first lever connecting post 14. The dual torsion spring design can greatly improve the sensitivity and stability of the tripping mechanism.

[0022] Preferably, the housing 1 is provided with a lock hole 22 in the middle corresponding to the limiting groove 21. By inserting a lock rod into the lock hole 22, the handle 8 can be prevented from being misoperated during power maintenance.

[0023] Preferably, an indicator member 23 is connected to the inner shaft of the housing 1, and the lower end of the indicator member 23 is connected to the connecting shaft 25 on the bracket 3 through a waist-shaped hole 24. When the trip mechanism 2 is opened or closed, the connecting shaft 25 rotates and prompts the user with the current status of the circuit breaker in different colors (green for open and red for closed).

[0024] Preferably, the handle 8 is provided with a positioning step 26 at the upper end corresponding to the rib 10. When the handle 8 is rotated into position, the positioning step 26 is used to position the U-shaped connecting rod 9 to improve the stability of opening and closing.

[0025] The above does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with this profession can make some changes or modifications to the above-disclosed structures and technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A DC miniature circuit breaker, comprising a housing (1) and a tripping mechanism (2) arranged in the housing (1), the tripping mechanism (2) comprising a bracket (3), a lock catch (4) axially connected to the middle of the bracket (3), and a tripping catch (5) axially connected to the top of the bracket (3), a moving contact (6) axially connected to the bottom of the bracket (3), a tension spring (7) connected to the upper end of the moving contact (6), the other end of the tension spring (7) connected to the housing (1), a handle (8) axially connected to the upper end of the housing (1), the handle (8) connected to the tripping catch (5) via a U-shaped connecting rod (9), characterized in that: A convex rib (10) is integrally formed at the lower right corner of the handle (8), and an axially extending shaft hole (11) is provided on the convex rib (10). The end of the U-shaped connecting rod (9) is connected to the shaft hole (11). The handle (8) is axially connected to the middle of the housing (1), and when the handle (8) rotates, the U-shaped connecting rod (9) pushes the tripping mechanism (2) to reset.

2. The DC miniature circuit breaker according to claim 1, characterized in that: The convex rib (10) is integrally formed at a 45° position at the lower right corner of the handle (8).

3. The DC miniature circuit breaker according to claim 1, characterized in that: The lock buckle (4) is provided with a first torsion spring (12), a first force arm (13) of the first torsion spring (12) acts on a first force arm connecting column (14) at the upper end of the bracket (3), and a second force arm (15) acts on a second force arm connecting column (16) at the lower end of the lock buckle (4).

4. The DC miniature circuit breaker according to claim 3, characterized in that: The jump buckle (5) is provided with a second torsion spring (17), a third force arm (18) of the second torsion spring (17) acts on a third force arm connecting column (19) at the upper end of the jump buckle (5), and a fourth force arm (20) acts on the first force arm connecting column (14).

5. The DC miniature circuit breaker according to claim 1, characterized in that: The housing (1) is provided with a limiting groove (21) with an angle of 45°, and the handle (8) rotates in the limiting groove (21).

6. The DC miniature circuit breaker according to claim 5, characterized in that: A locking hole (22) is provided in the middle of the housing (1) corresponding to the limiting groove (21).

7. The DC miniature circuit breaker according to claim 1, characterized in that: The housing (1) is connected to an inner shaft with an indicator member (23), and the lower end of the indicator member (23) is connected to a connecting shaft (25) on the bracket (3) via a waist-shaped hole (24).

8. The DC miniature circuit breaker according to claim 1, characterized in that: The handle (8) is provided with a positioning step (26) at the upper end corresponding to the rib (10).

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