A circuit breaker test circuit power taking mechanism

Abstract

The utility model relates to a circuit breaker test loop power taking mechanism, including casing and inside's opening and closing operation mechanism. Through operating handle drive contact seat swing control, static contactor opening and closing, spring mounting groove is equipped in casing and built -in contact spring, and the fixed arm of contact spring is connected with main loop in the groove side fixed clamping groove and connects main loop, and the rotary arm extends to the swing path of contact seat, contact seat is equipped with drive boss, and when closing, push rotary arm to contact piece displacement conduction, and make main loop current transmit to circuit board in fixed arm, rotary arm, contact piece in proper order. The utility model ensures that only when the contact is closed, the test loop is electrified, avoids misjudgment, and the overtravel friction of rotary arm and contact piece removes the oxidation layer and improves the contact reliability, and the isolation structure effectively prevents external interference.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to a power supply mechanism for a circuit breaker test circuit. Background Technology

[0002] In the existing circuit breaker product test circuit design, its power supply mechanism is usually directly connected to the main circuit board (or busbar) inside the product. This design means that as long as the main circuit of the circuit breaker product is energized (i.e. the circuit board / busbar is energized), the test circuit can be activated and work regardless of whether the main contacts of the circuit breaker itself are in the closed state.

[0003] This design presents significant safety hazards and technical defects: Risk of misjudgment: Operators may conduct tests when the circuit breaker's main contacts are not actually closed (in the open state). In this case, the test current does not flow through the circuit breaker's preset main conductive path (contacts, arc-extinguishing chamber, etc.), but rather through parallel bypasses or other unexpected paths. This will cause the test results (such as circuit on / off indications and signals) to fail to accurately reflect the circuit breaker's performance when the main contacts are closed, easily leading to misjudgments of the product's actual operating state by operators; Forcibly applying test current when the circuit breaker's main contacts are open may cause the test energy to act on insulating components or electronic components inside the circuit breaker that are not designed to carry main current, leading to overheating, breakdown, or permanent damage to these components.

[0004] Therefore, there is an urgent need to design an improved power supply mechanism or control logic for the test circuit. The core requirement is that the activation and operation of the test circuit must strictly depend on the reliable physical closure of the circuit breaker's main contacts. That is, the test circuit can only be established and obtain the electrical energy required for operation if and only if the circuit breaker's main contacts successfully close and form an effective main current path, thereby fundamentally eliminating the aforementioned risks of misjudgment and equipment damage. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings and deficiencies of the existing technology and to provide a power supply mechanism for the test circuit of a circuit breaker.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a circuit breaker test circuit power take-off mechanism, including a housing, wherein a closing and opening operation mechanism is provided inside the housing, the closing and opening operation mechanism includes a moving contact, a stationary contact, a contact seat, and an operating handle, the operating handle is rotatably mounted on the housing and linked with the contact seat, the contact seat swings to drive the moving contact and the stationary contact to open and close, the housing is provided with a spring mounting groove for placing a contact spring, the contact spring includes a fixed arm and a rotating arm; the fixed arm is snapped into a fixed slot on the side wall of the spring mounting groove and is connected to the main circuit through a wire; the rotating arm extends into the swing path of the contact seat, and the contact seat is provided with a driving boss; a contact piece is provided on one side of the adjacent rotating arm inside the housing, and the contact piece is connected to the circuit board through a wire; when the contact seat performs a closing action, its driving boss pushes the rotating arm to move towards the contact piece and make contact, so that the main circuit current is transmitted to the circuit board in sequence through the fixed arm, the rotating arm, and the contact piece.

[0007] As a preferred embodiment of this utility model, the bottom of the spring mounting groove is provided with a positioning post, and the center hole of the contact spring is sleeved on the positioning post.

[0008] As a preferred technical solution of this utility model, the housing includes a middle base, a middle cover and an upper base assembled in sequence, wherein: the spring mounting groove is provided in the middle base; the middle cover has a strip-shaped guide hole for the rotating arm to pass through; the upper base is provided with a mounting groove, and the contact piece is fixed in the mounting groove.

[0009] As a preferred technical solution of this utility model, the upper base is also provided with a detachable isolation cover plate, which covers the opening of the mounting groove and isolates the contact piece and the rotating arm in the mounting groove.

[0010] As a preferred embodiment of this utility model, the isolation cover is provided with a snap-fit ​​hole, and the upper base is provided with a snap-fit ​​post that cooperates with the snap-fit ​​hole, forming a locking structure after being fastened together.

[0011] As a preferred technical solution of this utility model, the opening and closing operation mechanism further includes: a lever, the middle part of which is rotatably connected to the middle cover via a rotating shaft, and its upper end is linked to the operating handle via a linkage shaft passing through the middle cover. The middle cover is provided with a movable hole for the linkage shaft to swing; a linkage rod, the first end of which is pivotally connected to the lower end of the lever and the second end of which is pivotally connected to the upper end of the contact seat; and a return spring, which is a compression spring, one end of which abuts against the fixed point of the middle cover and the other end of which abuts against the contact seat.

[0012] As a preferred embodiment of this utility model, the contact seat is provided with a boss, and the moving contact is provided with a socket that matches the shape of the boss, and the boss and the socket are inserted and engaged.

[0013] In summary, the beneficial effects of this utility model are as follows: by driving the contact spring rotating arm to move by the drive boss on the contact seat, it is ensured that "the test circuit is energized only when the main contact is physically closed", which completely avoids the risk of misjudgment (such as incorrect display of the closing status) or product damage caused by the circuit board being accidentally energized when the contact is not closed in the traditional design; after the rotating arm contacts the contact piece, it generates overtravel motion as the contact continues to close, and slides and rubs along the surface of the contact piece. The friction automatically scrapes off oxides or contaminants on the contact surface, ensuring stable contact resistance. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the internal structure of the cover of the circuit breaker of this utility model; Figure 2 This is a schematic diagram of the internal structure of the base of the circuit breaker of this utility model; Figure 3 This is a schematic diagram of the internal structure of the base in the circuit breaker of this utility model; Figure 4 This is a schematic diagram of the base structure in the circuit breaker of this utility model; Figure 5 This is a schematic diagram of the contact spring in this utility model; Figure 6 This is a schematic diagram of the contact seat in this utility model; Figure 7 This is a schematic diagram of the structure of the isolation cover plate in this utility model.

[0015] Reference numerals: 1. Housing; 2. Moving contact; 3. Stationary contact; 4. Contact seat; 5. Operating handle; 6. Spring mounting slot; 7. Fixed arm; 8. Rotating arm; 9. Fixed slot; 10. Drive boss; 11. Contact piece; 12. Positioning post; 13. Middle base; 14. Middle cover; 15. Upper base; 16. Strip guide hole; 17. Mounting slot; 18. Isolation cover plate; 19. Snap-fit ​​hole; 20. Snap-fit ​​post; 21. Lever; 22. Rotating shaft; 23. Linkage shaft; 24. Movable hole; 25. Linkage rod; 26. Return spring; 27. Fixed point; 28. Boss; 29. ​​Insertion hole; 30. Contact spring. Detailed Implementation

[0016] To make the technical means, creative features, and achieved objectives and effects of this utility model easier to understand, the present utility model is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are merely preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described in the implementation plan without creative effort are all within the protection scope of this utility model.

[0017] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0018] like Figure 1-7 The circuit breaker test circuit power supply mechanism shown includes a housing 1. A circuit breaker opening and closing operation mechanism is provided inside the housing 1. The opening and closing operation mechanism includes a moving contact 2, a stationary contact 3, a contact seat 4, and an operating handle 5. The operating handle 5 is rotatably mounted on the housing 1 and linked with the contact seat 4. The contact seat 4 swings to drive the moving contact 2 and the stationary contact 3 to open and close. A spring mounting groove 176 for placing a contact spring 30 is provided inside the housing 1. The contact spring 30 includes a fixed arm 7 and a rotating arm 8. The fixed arm 7 is engaged in a fixed slot 9 on the side wall of the spring mounting groove 176 and is connected to the main circuit (through a wire). The potential of the current-carrying component is obtained by welding the current-carrying component through the wire. The current-carrying component is a terminal block or braided wire, etc. This is the prior art, so it is not described in detail and is not the focus of this application); the rotating arm 8 extends into the swing path of the contact seat 4, and the contact seat 4 is provided with a driving boss 2810; a contact piece 11 is provided on one side of the adjacent rotating arm 8 in the housing 1, and the contact piece 11 is connected to the circuit board through the wire; when the contact seat 4 performs the closing action, its driving boss 2810 pushes the rotating arm 8 to move towards the contact piece 11 and make contact and conduct, so that the main circuit current is transmitted to the circuit board in sequence through the fixed arm 7, the rotating arm 8, and the contact piece 11.

[0019] The drive boss 2810 on the contact seat 4 pushes the contact spring 30 to rotate the arm 8, ensuring that "the test circuit is energized only when the main contacts are physically closed". This completely avoids the risk of misjudgment (such as incorrect display of the closing status) or product damage caused by the circuit board being accidentally energized when the contacts are not closed in traditional designs. After the rotating arm 8 contacts the contact piece 11, it generates overtravel motion as the contacts continue to close, sliding and rubbing along the surface of the contact piece 11. The friction automatically scrapes off oxides or contaminants from the contact surface, ensuring stable contact resistance.

[0020] When the product closes, the contact seat 4 pushes the rotating arm 8 of the contact spring 30 to move within the strip guide hole 16, eventually making contact with the contact piece 11. The power supply to the circuit board travels from the main circuit through the fixed arm 7 of the contact spring 30 to the rotating arm 8, and then through movement to the contact piece 11, which finally connects to the circuit board, enabling the circuit board to draw power. Simultaneously, the contact spring 30 closes with the contact piece 11 before the product contacts close. The advantage of this design is that the circuit board will definitely be energized and operational after the product is powered on.

[0021] The bottom of the spring mounting groove 176 is provided with a positioning post 12, and the center hole of the contact spring 30 is sleeved on the positioning post 12.

[0022] The housing 1 includes a lower base, a middle base 13, a middle cover 14 and an upper base 15 assembled in sequence, wherein: a spring mounting groove 176 is provided in the middle base 13; the middle cover 14 has a strip-shaped guide hole 16 for the rotating arm 8 to pass through; the upper base 15 is provided with a mounting groove 17, and the contact piece 11 is fixed in the mounting groove 17.

[0023] The upper base 15 is also provided with a removable isolation cover 18, which covers the opening of the mounting groove 17 and isolates the contact piece 11 and the rotating arm 8 within the mounting groove 17. The isolation cover 18 is provided with a snap-fit ​​hole 19, and the upper base 15 is provided with a snap-fit ​​post 20 that mates with the snap-fit ​​hole 19, forming a locking structure when fastened together. The advantage of the isolation cover 18 is that it can isolate the contact space between the contact spring 30 and the contact piece 11 from the external space, preventing interference from other factors.

[0024] The opening and closing operation mechanism also includes: a lever 21, the middle part of which is rotatably connected to the middle cover 14 via a rotating shaft 22, and its upper end is linked to the operating handle 5 via a linkage shaft 23 passing through the middle cover 14. The middle cover 14 is provided with a movable hole 24 for the linkage shaft 23 to swing; a linkage rod 25, the first end of which is pivotally connected to the lower end of the lever 21, and the second end of which is pivotally connected to the upper end of the contact seat 4; a return spring 26, which is a compression spring, one end of which abuts against the fixed point 27 of the middle cover 14, and the other end abuts against the contact seat 4. The contact seat 4 is provided with a boss 28, and the moving contact 2 is provided with an insertion hole 29 that matches the shape of the boss 28. The boss 28 and the insertion hole 29 are inserted and matched. The opening and closing principle in this embodiment is the prior art, so this application will not elaborate on it.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the utility model as defined by the appended claims and their equivalents.

Claims

1. A circuit breaker test circuit power take-off mechanism, comprising a housing (1), wherein a circuit breaker opening and closing operation mechanism is provided inside the housing (1), the circuit breaker opening and closing operation mechanism comprising a moving contact (2), a stationary contact (3), a contact seat (4), and an operating handle (5), wherein the operating handle (5) is rotatably mounted on the housing (1) and linked with the contact seat (4), and the contact seat (4) swings to drive the moving contact (2) and the stationary contact (3) to open and close, characterized in that: The housing (1) is provided with a spring mounting groove (17)(6) for placing a contact spring (30). The contact spring (30) includes a fixed arm (7) and a rotating arm (8). The fixed arm (7) is snapped into a fixed slot (9) on the side wall of the spring mounting groove (17)(6) and connected to the main circuit through a wire. The rotating arm (8) extends into the swing path of the contact seat (4) and the contact seat (4) is provided with a driving boss (28)(10). A contact piece (11) is provided on one side of the adjacent rotating arm (8) in the housing (1) and the contact piece (11) is connected to the circuit board through a wire. When the contact seat (4) performs the closing action, its driving boss (28)(10) pushes the rotating arm (8) to move towards the contact piece (11) and make contact and conduct, so that the main circuit current is transmitted to the circuit board in sequence through the fixed arm (7), the rotating arm (8), and the contact piece (11).

2. The circuit breaker test circuit power take-off mechanism according to claim 1, characterized in that: The bottom of the spring mounting groove (17) (6) is provided with a positioning post (12), and the center hole of the contact spring (30) is sleeved on the positioning post (12).

3. The circuit breaker test circuit power take-off mechanism according to claim 2, characterized in that: The housing (1) includes a middle base (13), a middle cover (14) and an upper base (15) assembled in sequence, wherein: the spring mounting groove (17) (6) is provided in the middle base (13); the middle cover (14) has a strip-shaped guide hole (16) for the rotating arm (8) to pass through; the upper base (15) is provided with a mounting groove (17), and the contact piece (11) is fixed in the mounting groove (17).

4. The circuit breaker test circuit power take-off mechanism according to claim 3, characterized in that: The upper base (15) is also provided with a removable isolation cover (18), which covers the opening of the mounting groove (17) and isolates the contact piece (11) from the rotating arm (8) in the mounting groove (17).

5. The circuit breaker test circuit power take-off mechanism according to claim 4, characterized in that: The isolation cover (18) is provided with a snap-fit ​​hole (19), and the upper base (15) is provided with a snap-fit ​​post (20) that cooperates with the snap-fit ​​hole (19), forming a locking structure after being fastened together.

6. The circuit breaker test circuit power take-off mechanism according to claim 3, characterized in that: The opening and closing operation mechanism further includes: a lever (21), the middle part of which is rotatably connected to the middle cover (14) via a rotating shaft (22), and its upper end is linked to the operating handle (5) via a linkage shaft (23) passing through the middle cover (14). The middle cover (14) is provided with a movable hole (24) for the linkage shaft (23) to swing; a linkage rod (25), the first end of which is pivotally connected to the lower end of the lever (21), and the second end of which is pivotally connected to the upper end of the contact seat (4); and a return spring (26), which is a compression spring, one end of which abuts against the fixed point (27) of the middle cover (14), and the other end abuts against the contact seat (4).

7. The circuit breaker test circuit power take-off mechanism according to claim 6, characterized in that: The contact seat (4) is provided with a boss (28), and the moving contact (2) is provided with a socket (29) that matches the shape of the boss (28). The boss (28) and the socket (29) are inserted into each other.

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