A small double screw circuit breaker

Abstract

The utility model relates to circuit breaker technical field especially is a kind of small double screw circuit breaker, including circuit breaker shell, the port of circuit breaker shell is rotatably connected with handle, the inner wall of circuit breaker shell is provided with actuator, and the one end of actuator is connected with handle, the utility model discloses by setting electromagnetic release in circuit breaker will produce magnetic push top rod movement, further make actuator drive moving contact tripping, simultaneously top rod will contact trigger switch, further make trigger switch control buzzer to run, make buzzer emit buzzing sound;By setting wire inserts two groups of terminal block in turn, subsequently twist bolt terminal post and rotate in turn, further make bolt terminal post spiral and descend on the outer wall of terminal block, will make two bolt terminal post simultaneously fixed to wire, the fixed fastening of wire is better, even if a group of bolt terminal post is not fixed in place, wire connection depth will also meet the demand.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, specifically a small double-screw circuit breaker. Background Technology

[0002] A circuit breaker is a protective device in a power system used to automatically disconnect faulty circuits. When an overload, short circuit, or leakage occurs in the circuit, its built-in tripping mechanism (such as a thermomagnetic or electromagnetic component) quickly disconnects the contacts, and the arc is extinguished by an arc-extinguishing device, thereby ensuring the safety of equipment and personnel. It combines manual control and automatic protection functions, is reusable, and is widely used in homes, industries, and high-voltage power grids. By matching the rated current, number of poles, and tripping characteristics (such as overload / short circuit / leakage protection), it achieves precise protection, offering greater safety and practicality compared to disposable fuses.

[0003] Existing circuit breakers use cross-head screws for both incoming and outgoing lines, employing a single-screw connection method. When any of the connecting bolts fails, it can lead to poor circuit contact, and the wiring depth of ≤18mm can cause overheating issues in high-current scenarios. Furthermore, when a short-circuit fault occurs in the circuit, the electromagnetic trip unit in the circuit breaker will generate magnetic force to move the push rod, thereby causing the actuator to trip the moving contact. However, existing circuit breakers only have a mechanical disconnection function and cannot promptly alert users to the problem of the circuit fault.

[0004] Therefore, a small twin-screw circuit breaker is needed to improve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a small double-screw circuit breaker to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A miniature double-screw circuit breaker includes a circuit breaker housing, a handle rotatably connected to a port of the circuit breaker housing, an actuator provided on the inner wall of the circuit breaker housing, one end of the actuator being connected to the handle, a thermal trip rod installed on the other end of the actuator, a moving contact provided on one side of the thermal trip rod and on the outer wall of the actuator, and a stationary contact provided on the inner wall of the circuit breaker housing.

[0008] The circuit breaker housing has an installation groove on its outer wall, and a wiring housing is provided on the inner wall of the installation groove. A bolt terminal is threaded onto the outer wall of the wiring housing. An arc-extinguishing chamber is provided on the inner wall of the circuit breaker housing. An electromagnetic trip unit is provided on one side of the arc-extinguishing chamber and on the inner wall of the circuit breaker housing. A push rod is slidably connected to the inner wall of the electromagnetic trip unit. A trigger switch is provided on one side of the push rod and on the inner wall of the circuit breaker housing. A buzzer is embedded in the outer wall of the circuit breaker housing.

[0009] As a preferred embodiment of this utility model, the mounting groove is a connected structure, and multiple sets of mounting grooves are provided, which are respectively located on the opposite outer walls of the circuit breaker housing.

[0010] As a preferred embodiment of this utility model, the mounting slots are arranged in pairs in a symmetrical structure, and wiring housings are sequentially arranged on the inner wall of the mounting slots, with the cross-section of the wiring housings being rectangular.

[0011] As a preferred embodiment of this utility model, the top of the bolt terminal is provided with an internal hexagonal groove, and a protrusion is provided directly below the bolt terminal and on the inner wall of the wiring housing, and the handle is located on one side of the actuator.

[0012] In a preferred embodiment of this utility model, the moving contact is located on one side of the stationary contact, the arc-extinguishing chamber is located on one side of the moving contact, and the electromagnetic trip unit is located on one side of the arc-extinguishing chamber.

[0013] As a preferred embodiment of this utility model, the electromagnetic trip unit is located on one side of the actuator, and the trigger switch is connected to a buzzer via a wire in an electrical connection manner.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] In this invention, the bolt terminals in the miniature double-screw circuit breaker are used, and wires are sequentially inserted into two sets of wiring housings. Then, the bolt terminals are rotated sequentially, causing them to spiral downwards on the outer wall of the wiring housing. This allows both sets of bolt terminals to simultaneously secure the wires, resulting in better wire fixation. Even if one set of bolt terminals is not fully secured, the wire connection depth will still meet the requirements. This addresses the problem of existing circuit breakers using cross-head screws and single-screw wiring, where a faulty bolt can lead to poor circuit contact, and the wiring depth of ≤18mm can cause overheating in high-current scenarios.

[0016] In this invention, a trigger switch in a miniature double-screw circuit breaker is used. When a short circuit fault occurs in the circuit, the electromagnetic trip unit in the circuit breaker generates magnetism to push the push rod to move, thereby causing the actuator to trip the moving contact. At the same time, the push rod contacts the trigger switch, which in turn controls the buzzer to operate, causing the buzzer to sound. This prompts the user to maintain the circuit breaker in a timely manner, thus solving the problem that existing circuit breakers only have a mechanical disconnect function and cannot promptly alert users to circuit faults. Attached Figure Description

[0017] Figure 1 This is a top view of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of the circuit breaker housing of this utility model;

[0019] Figure 3 This is a schematic diagram of the wiring housing structure of this utility model.

[0020] In the diagram: 1. Circuit breaker housing; 2. Handle; 3. Actuator; 4. Thermal trip lever; 5. Moving contact; 6. Stationary contact; 7. Mounting slot; 8. Wiring housing; 9. Bolt terminal block; 10. Arc extinguishing chamber; 11. Electromagnetic trip unit; 12. Push rod; 13. Trigger switch; 14. Buzzer. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0022] For examples, please refer to Figure 1-3 This utility model provides a technical solution:

[0023] A small double-screw circuit breaker includes a circuit breaker housing 1, a handle 2 rotatably connected to the port of the circuit breaker housing 1, an actuator 3 provided on the inner wall of the circuit breaker housing 1, one end of the actuator 3 being connected to the handle 2, a thermal trip rod 4 being installed on the other end of the actuator 3, a moving contact 5 being provided on one side of the thermal trip rod 4 and on the outer wall of the actuator 3, and a stationary contact 6 being provided on the inner wall of the circuit breaker housing 1.

[0024] The circuit breaker housing 1 has an installation groove 7 on its outer wall. A wiring housing 8 is installed on the inner wall of the installation groove 7. A bolt terminal 9 is threadedly connected to the outer wall of the wiring housing 8. An arc-extinguishing chamber 10 is installed on the inner wall of the circuit breaker housing 1. An electromagnetic trip unit 11 is installed on one side of the arc-extinguishing chamber 10 and on the inner wall of the circuit breaker housing 1. A push rod 12 is slidably connected to the inner wall of the electromagnetic trip unit 11. A trigger switch 13 is installed on one side of the push rod 12 and on the inner wall of the circuit breaker housing 1. A buzzer 14 is embedded in the outer wall of the circuit breaker housing 1.

[0025] In this embodiment, please refer to Figure 1 , Figure 2 and Figure 3The mounting slot 7 is a connected structure. Multiple sets of mounting slot 7 are opened and are located on the opposite outer walls of the circuit breaker housing 1. The mounting slots 7 are symmetrical in pairs. The inner wall of the mounting slot 7 is provided with wiring housing 8 in sequence. The cross-section of the wiring housing 8 is a rectangular structure. The top of the bolt terminal 9 is provided with an internal hexagonal groove. The bolt terminal 9 is provided with a protrusion on the inner wall of the wiring housing 8 directly below it. The handle 2 is located on one side of the actuator 3. The moving contact 5 is located on one side of the stationary contact 6. The arc-extinguishing chamber 10 is located on one side of the moving contact 5. The electromagnetic trip device 11 is located on one side of the arc-extinguishing chamber 10. The electromagnetic trip device 11 is located on one side of the actuator 3. The trigger switch 13 is connected to the buzzer 14 through the wire and the connection method is electrical connection, which makes the device energized.

[0026] Furthermore, the buzzer 14 is a self-powered structure. The traditional wiring depth of ≤18mm leads to the problem of overheating in high current scenarios. The improved 25mm depth increases the conductive contact area, making the temperature rise more stable. The temperature rise is significantly improved compared to traditional products.

[0027] The working process of this utility model is as follows: When the miniature double-screw circuit breaker designed in this scheme is in operation, an installation groove 7 is provided on the outer wall of the circuit breaker housing 1. A wiring housing 8 is provided on the inner wall of the installation groove 7, and a bolt terminal 9 is threadedly connected to the outer wall of the wiring housing 8. The installation groove 7 is a connected structure, and multiple sets of installation grooves 7 are provided, located on opposite outer walls of the circuit breaker housing 1. The installation grooves 7 are symmetrical in pairs, and the wiring housings 8 are arranged sequentially on the inner wall of the installation groove 7. The cross-section of the wiring housing 8 is a rectangular structure. Under the action of the internal hexagonal groove on the top of the bolt terminal 9... Insert the wires into the two sets of terminal housings 8 in sequence, and then turn the bolt terminals 9 in sequence to rotate them. This causes the bolt terminals 9 to spiral down on the outer wall of the terminal housing 8, which allows both sets of bolt terminals 9 to fix the wires simultaneously. This provides better wire fixation and tightness. Even if one set of bolt terminals 9 is not fixed in place, the wire connection depth will still meet the requirements. This helps to solve the problem that the current circuit breaker uses cross screws and single screw connection for the incoming and outgoing lines. When any of the connection bolts fails, it will cause poor circuit contact, and the connection depth ≤18mm will cause overheating in high current scenarios.

[0028] A push rod 12 is slidably connected to the inner wall of the electromagnetic trip unit 11. A trigger switch 13 is installed on one side of the push rod 12 and on the inner wall of the circuit breaker housing 1. A buzzer 14 is embedded in the outer wall of the circuit breaker housing 1. When a short circuit fault occurs in the circuit, the electromagnetic trip unit 11 in the circuit breaker will generate magnetism to push the push rod 12 to move, thereby causing the actuator 3 to drive the moving contact 5 to trip. At the same time, the push rod 12 will contact the trigger switch 13, thereby causing the trigger switch 13 to control the buzzer 14 to operate, causing the buzzer 14 to emit a buzzing sound, thereby prompting the user to maintain the circuit breaker in time. This helps to solve the problem that the existing circuit breakers only have a mechanical disconnection function and cannot promptly remind users to detect circuit faults.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A miniature double-screw circuit breaker, comprising a circuit breaker housing (1), characterized in that: A handle (2) is rotatably connected to the port of the circuit breaker housing (1). An actuator (3) is provided on the inner wall of the circuit breaker housing (1). One end of the actuator (3) is connected to the handle (2). A thermal trip rod (4) is installed on the other end of the actuator (3). A moving contact (5) is provided on one side of the thermal trip rod (4) and on the outer wall of the actuator (3). A stationary contact (6) is provided on the inner wall of the circuit breaker housing (1). The circuit breaker housing (1) has an installation groove (7) on its outer wall. A wiring housing (8) is provided on the inner wall of the installation groove (7). A bolt terminal (9) is threaded onto the outer wall of the wiring housing (8). An arc-extinguishing chamber (10) is provided on the inner wall of the circuit breaker housing (1). An electromagnetic trip unit (11) is provided on one side of the arc-extinguishing chamber (10) and on the inner wall of the circuit breaker housing (1). A push rod (12) is slidably connected to the inner wall of the electromagnetic trip unit (11). A trigger switch (13) is provided on one side of the push rod (12) and on the inner wall of the circuit breaker housing (1). A buzzer (14) is embedded in the outer wall of the circuit breaker housing (1).

2. The miniature double-screw circuit breaker according to claim 1, characterized in that: The mounting slot (7) is a connected structure, and multiple sets of mounting slots (7) are opened and located on the opposite outer walls of the circuit breaker housing (1).

3. A miniature double-screw circuit breaker according to claim 1, characterized in that: The mounting slots (7) are arranged in pairs with a symmetrical structure, and wiring housings (8) are arranged sequentially on the inner wall of the mounting slots (7). The cross-section of the wiring housings (8) is a rectangular structure.

4. A miniature double-screw circuit breaker according to claim 1, characterized in that: The top of the bolt terminal (9) is provided with an internal hexagonal groove, and a protrusion is provided directly below the bolt terminal (9) and on the inner wall of the wiring housing (8). The handle (2) is located on one side of the actuator (3).

5. A miniature double-screw circuit breaker according to claim 1, characterized in that: The moving contact (5) is located on one side of the stationary contact (6), the arc-extinguishing chamber (10) is located on one side of the moving contact (5), and the electromagnetic trip unit (11) is located on one side of the arc-extinguishing chamber (10).

6. A miniature double-screw circuit breaker according to claim 1, characterized in that: The electromagnetic trip unit (11) is located on one side of the actuator (3), and the trigger switch (13) is connected to a buzzer (14) via a wire and the connection method is electrical connection.

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