A trip unit for a circuit breaker

Abstract

The utility model provides a tripping mechanism for circuit breaker relates to circuit breaker technical field, including mechanism body, the mechanism body is provided with circuit breaker coil, the both ends of circuit breaker coil are provided with the wiring drum of up and down direction, is set up on the left side wall of wiring drum of circuit breaker coil the threaded hole, the threaded hole inside of circuit breaker coil is installed with wiring lock column, the outside circumference of wiring lock column is set up with thread, the left end surface of wiring lock column is set up with the hexagonal groove, the right end surface of wiring lock column is provided with frosted surface, the inside of wiring drum of circuit breaker coil is inserted to the soft wiring conveniently, wiring lock column is installed on circuit breaker coil through thread to lock and fix the soft wiring conveniently, solved the soft wiring direct crimping on the coil, led to the soft wiring to be unable to dismantle replacement, the measure of inconvenient wiring on the coil adds, makes the soft wiring can dismantle replacement problem.

Description

Technical Field

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

[0002] The tripping mechanism used in circuit breakers is an important component of the operating system that enables the switch to trip automatically. During the closing process and when the circuit breaker is in the closed position, the tripping mechanism acts as a fulcrum. When the circuit breaker trips automatically, the tripping mechanism is operated by the tripping device to release this fulcrum, allowing the circuit breaker to enter the free-opening state. Common tripping mechanisms include electromagnetic tripping, thermal tripping, and leakage current tripping.

[0003] Based on the above, the inventors have discovered the following shortcomings in existing circuit breaker tripping mechanisms: 1. The flexible connector is directly crimped onto the coil, making it impossible to remove and replace the flexible connector. It is inconvenient to add wiring measures to the coil so that the flexible connector can be removed and replaced. 2. When the tripped iron core is reset by the spring, the iron core is prone to impacting the damping cylinder and causing damage. It is inconvenient to install anti-collision measures on the damping cylinder to prevent the iron core from impacting the damping cylinder during reset. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a tripping mechanism for circuit breakers, which solves the problems of existing flexible wires being directly crimped onto the coil, making it impossible to disassemble and replace the flexible wires, and making it inconvenient to add wiring measures to the coil to make the flexible wires disassemble and replaceable; when the tripping iron core is reset by the spring, the iron core is prone to impacting the damping cylinder and causing damage, and it is inconvenient to add anti-collision measures to the damping cylinder to prevent the iron core from impacting the damping cylinder during reset.

[0005] The purpose and function of the tripping mechanism for the circuit breaker of this utility model are achieved by the following specific technical means: A tripping mechanism for a circuit breaker includes a mechanism body; the mechanism body is provided with a circuit breaker coil, and both ends of the circuit breaker coil are provided with vertically oriented terminal tubes. A threaded hole is opened on the left side wall of the terminal tube of the circuit breaker coil, and a terminal locking post is installed inside the threaded hole of the circuit breaker coil. The outer circumference of the terminal locking post is threaded, the left end face of the terminal locking post is provided with a regular hexagonal groove, and the right end face of the terminal locking post is provided with a frosted surface.

[0006] Furthermore, a rubber annular pad is fitted around the lower outer circumference of the release linkage rod, and a wear-resistant layer is provided on the inner circumferential surface of the rubber annular pad.

[0007] Furthermore, a tripping linkage rod is installed inside the threaded blind hole of the movable iron core column. A threaded post is provided on the bottom end face of the tripping linkage rod, and a regular hexagonal prism is provided on the top end face of the tripping linkage rod. The top end face of the regular hexagonal prism of the tripping linkage rod is set as a pulling rod, and a limit post is provided on the top end face of the pulling rod of the tripping linkage rod.

[0008] Furthermore, a movable iron core column is placed inside the bearing damping cylinder. The movable iron core column has a stepped columnar structure. A threaded blind hole is opened in the center of the top end face of the movable iron core column. A regular hexagonal groove is opened in the middle of the bottom end face of the movable iron core column. A return spring is sleeved on the lower outer circumference of the movable iron core column.

[0009] Furthermore, a fixed limiting cylinder is threadedly installed on the annular groove of the bearing damping cylinder. The top outer circumference of the fixed limiting cylinder is threaded, the lower outer circumference of the fixed limiting cylinder is provided with a regular hexagonal structure, and the middle outer circumference of the fixed limiting cylinder is provided with a limiting ring plate.

[0010] Furthermore, a damping cylinder bracket is installed on the threaded post that supports the damping cylinder. The damping cylinder bracket is an L-shaped plate structure, and a threaded hole that runs through the top and bottom is opened in the middle of the horizontal plate of the damping cylinder bracket.

[0011] Furthermore, a load-bearing damping cylinder is placed inside the circuit breaker coil. A threaded annular groove is formed on the inner circumference of the bottom of the load-bearing damping cylinder. A regular hexagonal plate is provided on the top end face of the load-bearing damping cylinder. A threaded post is provided in the middle of the top end face of the regular hexagonal plate of the load-bearing damping cylinder. A through hole is formed at the center of the threaded post of the load-bearing damping cylinder.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The design facilitates the insertion of flexible connectors into the wiring sleeve of the circuit breaker coil. The locking pin is threaded onto the circuit breaker coil to lock and secure the flexible connector. This solves the problem that the flexible connector is directly crimped onto the coil, making it impossible to disassemble and replace, and that it is inconvenient to add wiring measures to the coil to allow for disassembly and replacement of the flexible connector.

[0013] The rubber ring pad is convenient to be placed inside the top of the load-bearing damping cylinder, which facilitates the buffering of the moving iron core column during reset. This solves the problem that when the tripped iron core is reset by the spring, the iron core is prone to impacting the damping cylinder and causing damage, and it is inconvenient to install anti-collision measures on the damping cylinder to prevent the iron core from impacting the damping cylinder during reset. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the main structure of this utility model.

[0015] Figure 2 This is a bottom view of the structure of this utility model.

[0016] Figure 3 This is a cross-sectional structural diagram of the present invention.

[0017] Figure 4 This is a disassembled structural diagram of the present invention.

[0018] Figure 5 This is an assembly diagram of the circuit breaker coil and wiring locking post of this utility model.

[0019] Figure 6 This is a schematic diagram showing the positions of the movable iron core column and the rubber annular pad of this utility model.

[0020] In the diagram: 1. Mechanism body; 2. Circuit breaker coil; 3. Wiring locking column; 4. Bearing damping cylinder; 5. Damping cylinder bracket; 6. Fixed limit cylinder; 7. Moving iron core column; 8. Tripping linkage rod; 9. Rubber ring pad. Detailed Implementation

[0021] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples.

[0022] Example 1: As shown in the attached document Figure 1 To be continued Figure 6 As shown: This utility model provides a tripping mechanism for a circuit breaker, including a mechanism body 1. The mechanism body 1 is equipped with a circuit breaker coil 2 for easy current flow. Both ends of the circuit breaker coil 2 are provided with vertically oriented terminal blocks for easy insertion of flexible wiring. A threaded hole is provided on the left side wall of the terminal block of the circuit breaker coil 2 for easy installation of a wiring locking pin 3 via threads. The wiring locking pin 3 is installed inside the threaded hole of the circuit breaker coil 2 for easy locking and fixing of the flexible wiring. The outer circumference of the wiring locking pin 3 is threaded for easy installation via threads. A regular hexagonal groove is provided on the left end face of the wiring locking pin 3 for easy rotation and disassembly using tools. The right end face of the wiring locking pin 3 is provided with a frosted surface to increase the friction between the wiring locking pin 3 and the flexible wiring, preventing the flexible wiring from coming off. A load-bearing damping cylinder 4 is placed inside the circuit breaker coil 2. The damping cylinder 4 has a threaded annular groove on its bottom inner circumference to facilitate the installation of the limiting cylinder 6 by threads. A regular hexagonal plate is provided on the top end face of the damping cylinder 4 to facilitate its rotation and disassembly using tools. A threaded post is provided in the middle of the top end face of the regular hexagonal plate of the damping cylinder 4 to facilitate the installation of the damping cylinder bracket 5 by threads. A through hole is provided in the center of the threaded post of the damping cylinder 4 to facilitate the insertion and movement of the tripping linkage rod 8. The damping cylinder bracket 5 is installed on the threaded post of the damping cylinder 4 to facilitate the load-bearing of various components. The damping cylinder bracket 5 has an overall L-shaped plate structure to facilitate load-bearing, and the lower end of the damping cylinder bracket 5 is cut off. A through threaded hole is provided in the middle of the horizontal plate of the damping cylinder bracket 5 to facilitate the installation of the damping cylinder 4 by threads.

[0023] The bearing damping cylinder 4 has a fixed limiting cylinder 6 threadedly installed on its annular groove to facilitate limiting and preventing the circuit breaker coil 2 and the movable iron core column 7 from disengaging. The top outer circumference of the fixed limiting cylinder 6 has threads for easy installation. The lower outer circumference of the fixed limiting cylinder 6 has a regular hexagonal structure for easy rotation and disassembly using tools. The middle outer circumference of the fixed limiting cylinder 6 has a limiting ring plate for limiting and preventing the circuit breaker coil 2 from disengaging. The movable iron core column 7 is placed inside the bearing damping cylinder 4, facilitating its movement via electromagnetic induction. The movable iron core column 7 has a stepped columnar structure for easy descent and anti-disengagement. The top end face of the movable iron core column 7 has a threaded blind hole for threaded installation of the tripping linkage rod 8. The bottom end face of the movable iron core column 7 has a regular hexagonal groove for easy passage. The tool is rotated for disassembly and assembly. A return spring is fitted around the lower outer circumference of the movable iron core column 7, facilitating its reset under reaction force. A tripping linkage rod 8 is installed inside the threaded blind hole of the movable iron core column 7, facilitating the pulling of the tripping structure. A threaded post is provided on the bottom end face of the tripping linkage rod 8, facilitating its threaded installation. A regular hexagonal prism is provided on the top end face of the tripping linkage rod 8, facilitating its disassembly and assembly by rotating the tool. The top end face of the regular hexagonal prism of the tripping linkage rod 8 is set as a pull rod, facilitating its insertion into the tripping structure. A limit post is provided on the top end face of the pull rod of the tripping linkage rod 8, facilitating its hooking onto the tripping structure. A rubber annular pad 9 is fitted around the lower outer circumference of the tripping linkage rod 8, facilitating the cushioning of the reset impact of the movable iron core column 7. A wear-resistant layer is provided on the inner circumferential surface of the rubber annular pad 9, facilitating its service life.

[0024] The specific usage and function of this embodiment are as follows: In this utility model, such as Figure 1 As shown, the lower end of the damping cylinder bracket 5 is in a cut-off state. When the circuit breaker coil 2 is wired, the flexible wire is inserted into the wiring cylinder of the circuit breaker coil 2, and the wiring locking post 3 is installed on the circuit breaker coil 2 by thread to lock and fix the flexible wire. This realizes the detachable connection between the flexible wire and the circuit breaker coil 2, solving the problem that the flexible wire is directly pressed onto the coil, making it impossible to disassemble and replace. When the circuit breaker coil 2 is supplied with fault current, the circuit breaker coil 2 generates a strong electromagnetic field, causing the moving iron core column 7 to move downward to overcome the force of the reset spring. The moving iron core column 7 drives the trip linkage rod 8 to pull the external trip assembly, thereby tripping the circuit breaker. At this time, the reset spring of the moving iron core column 7 pushes the moving iron core column 7 back to its original position after the electromagnetic force disappears. When the moving iron core column 7 returns to its original position, the rubber ring pad 9 absorbs the impact energy of the moving iron core column 7 through elastic deformation, reducing metal fatigue damage and solving the problem that the iron core is easily damaged by impacting the damping cylinder when the tripping iron core is reset by the spring.

[0025] Example 2: Unlike Example 1, the regular hexagonal groove of the wiring locking post 3 can also be set as a regular heptagonal groove. This makes the wiring locking post 3 require a special tool that matches the regular heptagonal groove to rotate, thus preventing non-staff members from rotating and disassembling the wiring locking post 3.

[0026] Example 3: The difference from Example 1 is that the regular hexagonal prism of the trip linkage 8 can also be set as a regular heptagonal prism, so that the trip linkage 8 can only be rotated by a special tool that cooperates with the regular heptagonal prism, thus preventing non-workers from rotating and disassembling the trip linkage 8.

Claims

1. A tripping mechanism for a circuit breaker, characterized in that: The mechanism includes a main body (1); the main body (1) is provided with a circuit breaker coil (2), and both ends of the circuit breaker coil (2) are provided with vertically oriented terminal blocks. A threaded hole is provided on the left side wall of the terminal block of the circuit breaker coil (2). A terminal locking pin (3) is installed inside the threaded hole of the circuit breaker coil (2). A thread is provided on the outer circumference of the terminal locking pin (3). A regular hexagonal groove is provided on the left end face of the terminal locking pin (3). A frosted surface is provided on the right end face of the terminal locking pin (3).

2. The tripping mechanism for a circuit breaker as described in claim 1, characterized in that: The circuit breaker coil (2) has a bearing damping cylinder (4) inside. The bearing damping cylinder (4) has a threaded annular groove on the inner circumference of the bottom. The bearing damping cylinder (4) has a regular hexagonal plate on the top end face. The bearing damping cylinder (4) has a threaded post in the middle of the top end face of the regular hexagonal plate. The bearing damping cylinder (4) has a through hole in the center of the threaded post.

3. The tripping mechanism for a circuit breaker as described in claim 2, characterized in that: The damping cylinder (4) is mounted on a threaded post. The damping cylinder support (5) is an L-shaped plate structure. The horizontal plate of the damping cylinder support (5) has a threaded hole that runs through it from top to bottom.

4. The tripping mechanism for a circuit breaker as described in claim 3, characterized in that: A fixed limiting cylinder (6) is installed on the annular groove of the bearing damping cylinder (4) by thread. The top outer circumference of the fixed limiting cylinder (6) is threaded, the lower outer circumference of the fixed limiting cylinder (6) is provided with a regular hexagonal structure, and the middle outer circumference of the fixed limiting cylinder (6) is provided with a limiting ring plate.

5. The tripping mechanism for a circuit breaker as described in claim 4, characterized in that: The bearing damping cylinder (4) contains a movable iron core column (7). The movable iron core column (7) is a stepped column structure. A threaded blind hole is opened in the center of the top end face of the movable iron core column (7). A regular hexagonal groove is opened in the middle of the bottom end face of the movable iron core column (7). A reset spring is sleeved on the lower outer circumference of the movable iron core column (7).

6. The tripping mechanism for a circuit breaker as described in claim 5, characterized in that: The movable iron core column (7) has a release linkage rod (8) installed inside the threaded blind hole. The bottom end face of the release linkage rod (8) is provided with a threaded column, and the top end face of the release linkage rod (8) is provided with a regular hexagonal prism. The top end face of the regular hexagonal prism of the release linkage rod (8) is set as a pull rod, and the top end face of the pull rod of the release linkage rod (8) is provided with a limit post.

7. The tripping mechanism for a circuit breaker as described in claim 6, characterized in that: The lower end of the release linkage rod (8) is fitted with a rubber ring pad (9) on its outer circumference, and the inner circumferential surface of the rubber ring pad (9) is provided with a wear-resistant layer.

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