Operating mechanism of circuit breaker

Abstract

The utility model provides an operating mechanism of a circuit breaker, which comprises the components of a knob which is rotatably mounted on a housing and drives a rotating wheel to rotate through a link rod; the rotating wheel is rotationally installed on the shell, a first elastic piece is arranged between the rotating wheel and the moving contact assembly, and the moving contact assembly is driven to rotate through the first elastic piece; a third elastic piece is arranged between the jump pin and the rotating wheel, a locking opening for the end portion of the link rod to be inserted is formed between the jump pin and the rotating wheel under the elastic acting force of the third elastic piece, and the end portion of the link rod abuts against the locking opening in the closing process. In the switching-on process, the third elastic piece can enable the locking opening to be kept in a closed state, the rotary knob abuts against the locking opening through the connecting rod so as to drive the rotating wheel to rotate, the rotating wheel drives the moving contact assembly to rotate in the switching-on direction through the first elastic piece, and furthermore, the rotary knob is installed in the middle of the shell. Even if the circuit breaker is installed in a narrow space, the knob can be manually operated conveniently, so that the circuit breaker is convenient for a user to use.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to an operating mechanism of a circuit breaker. Background Art

[0002] A circuit breaker is a low-voltage protective device used in power distribution systems to connect or interrupt load lines. It has both a manual switch function and the ability to automatically perform overload, short circuit, and leakage protection.

[0003] The traditional circuit breaker operating mechanism generally includes a knob, a connecting rod, a trip button, a lock button, and a contact bracket. One end of the connecting rod is connected to the knob, and the other end is connected to the trip button. The trip button and the lock button are both rotatably mounted on the contact bracket. The trip button and the lock button are respectively provided with a first locking tooth and a second locking tooth that can cooperate with each other. When closing the circuit, the first locking tooth of the trip button abuts against the second locking tooth of the lock button, and the knob drives the contact bracket to rotate in the closing direction through the connecting rod. The structure of the first locking tooth and the second locking tooth cooperating and locking is unstable. If the circuit breaker is subjected to vibration and other factors, the first locking tooth and the second locking tooth are easily separated, resulting in the circuit breaker opening, and the reliability is low. In addition, the knob of the traditional circuit breaker is set on the side of the shell, and the shell has enough space to arrange the operating mechanism to realize the function of the circuit breaker. When the circuit breaker is installed in a narrow space, it is inconvenient to reach in and rotate the knob, and there is a defect of inconvenient manual operation. Utility Model Content

[0004] Therefore, the utility model aims to provide an operating mechanism for a circuit breaker with high reliability and convenient operation.

[0005] To this end, the utility model provides an operating mechanism of a circuit breaker, comprising a knob, a rotating wheel and a trip button, wherein the knob is rotatably mounted on a housing, and the knob drives the rotating wheel to rotate through a connecting rod; the rotating wheel is rotatably mounted on the housing, a first elastic member is provided between the rotating wheel and a moving contact assembly, and the moving contact assembly is driven to rotate through the first elastic member; the trip button is rotatably mounted on the housing, a third elastic member is provided between the trip button and the rotating wheel, a locking opening for inserting the end of the connecting rod is formed between the trip button and the rotating wheel under the elastic force of the third elastic member, and the end of the connecting rod abuts against the locking opening during the closing process; the moving contact assembly comprises a moving contact frame, and a moving contact fixed on the moving contact frame.

[0006] The knob is installed at the middle position of the shell.

[0007] The jump button, the rotating wheel and the moving contact frame all rotate around the same first rotating shaft.

[0008] The first elastic member is arranged at the end of the rotating wheel of the first rotating shaft away from the moving contact.

[0009] It also includes a reset spring, one end of which is connected to the rotating wheel, and the other end of which is connected to the housing, and the reset spring is suitable for applying an elastic force to the rotating wheel to move toward the opening position.

[0010] The trip button has a first rotating arm and a second rotating arm located on both sides of its rotation center. The first rotating arm is arranged corresponding to the push rod of the overcurrent tripping mechanism, and the locking opening is formed between the end of the second rotating arm and the rotating wheel.

[0011] The return spring and the first elastic member are both tension springs.

[0012] The third elastic member is a compression spring.

[0013] The technical solution of the utility model has the following advantages:

[0014] 1. The operating mechanism of the circuit breaker provided by the utility model comprises a knob, a rotating wheel, a trip button, and a third elastic member. Under the elastic force of the third elastic member, a locking opening for inserting an end of a connecting rod is formed between the trip button and the rotating wheel. During the closing process, under the elastic force of the third elastic member, the locking opening can be kept in a closed state. The knob abuts against the locking opening through the connecting rod, thereby driving the rotating wheel to rotate. The rotating wheel drives the moving contact assembly to rotate in the closing direction through the first elastic member. The above-mentioned operating mechanism is not easily affected by external vibration factors and has the advantage of high reliability.

[0015] 2. In the operating mechanism of the circuit breaker provided by the utility model, the knob is installed in the middle position of the housing, so that it is convenient to manually operate the knob even if the circuit breaker is installed in a narrow space.

[0016] 3. In the operating mechanism of the circuit breaker provided by the utility model, the first elastic member is arranged on the opposite or corresponding side of the first rotating shaft away from the moving contact, so that the housing space is reasonably utilized and the structure is more compact.

[0017] 4. In the operating mechanism of the circuit breaker provided by the utility model, the rotating wheel and the moving contact assembly are directly connected through a tension spring, and the connecting rod connected to the rotating wheel exerts force on the moving contact assembly through the rotating wheel, so that the closing of the circuit breaker is more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of the circuit breaker of the utility model;

[0020] Figure 2 It is a schematic diagram of the structure of the circuit breaker operating mechanism;

[0021] Figure 3 This is a schematic diagram of the structure after the knob and connecting rod are removed from the operating mechanism.

[0022] Explanation of the accompanying drawings: 1. Housing; 3. Moving contact assembly; 4. Knob; 5. Connecting rod; 6. Rotating wheel; 7. First elastic member; 17. Jump button; 18. Third elastic member; 19. Locking opening; 20. Moving contact frame; 21. Moving contact; 22. First rotating shaft; 65. Push rod; 200. Reset spring; 201. First rotating arm; 202. Second rotating arm; 104. Overcurrent release mechanism. DETAILED DESCRIPTION

[0023] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0027] Example

[0028] This embodiment provides an operating mechanism of a circuit breaker, such as Figure 1 and Figure 2 As shown, it includes a knob 4, a connecting rod 5, a rotating wheel 6, a trip button 17, a first elastic member 7, a third elastic member 18, a reset spring 200 and a moving contact assembly 3.

[0029] The moving contact assembly 3 includes a moving contact frame 20 and a moving contact 21 fixed on the moving contact frame 20 . The moving contact frame 20 is rotatably mounted on the housing 1 around a first rotating shaft 22 .

[0030] The knob 4 is rotatably mounted at the middle position of the housing 1. One end of the connecting rod 5 is connected to the knob 4, and the other end can cooperate with the rotating wheel 6. The knob 4 drives the rotating wheel 6 to rotate through the connecting rod 5. The housing 1 is provided with a torsion spring for driving the knob 4 to reset.

[0031] The rotating wheel 6 is installed on the housing 1 and rotates around the first rotating shaft 22. A first elastic member 7 is provided between the rotating wheel 6 and the moving contact assembly 3, and the moving contact assembly 3 is driven to rotate by the first elastic member 7. In this embodiment, the first elastic member 7 is provided at the end of the rotating wheel 6 away from the moving contact 21 on the first rotating shaft 22.

[0032] The jump button 17 is rotatably mounted on the housing 1. Figure 2 and Figure 3 As shown, a third elastic member 18 is provided between the jumper 17 and the rotating wheel 6, and a locking opening 19 for inserting the end of the connecting rod 5 is formed between the jumper 17 and the rotating wheel 6 under the elastic force of the third elastic member 18, and the end of the connecting rod 5 abuts against the locking opening 19 during the closing process. The rotating wheel 6, the jumper 17 and the moving contact assembly 3 are coaxially arranged, so that the operating mechanism has a compact structure, reasonably utilizes the space of the housing 1, and is conducive to the reasonable layout of other related mechanisms in the housing 1.

[0033] In this embodiment, the trip button 17 has a first rotating arm 201 and a second rotating arm 202 located on both sides of its rotation center, the first rotating arm 201 is arranged corresponding to the push rod 65 of the overcurrent tripping mechanism 104, the end of the second rotating arm 202 forms the locking opening 19 with the rotating wheel 6, and the third elastic member 18 is a compression spring. It should be noted that the overcurrent tripping mechanism 104 is an existing mature technology, so its specific structure and working principle are not described in detail.

[0034] One end of the return spring 200 is connected to the rotating wheel 6, and the other end is connected to the housing 1. The return spring 200 is suitable for applying an elastic force to the rotating wheel 6 to move toward the opening position. In this embodiment, the return spring 200 is a tension spring.

[0035] It should be noted that the return spring 200 may be a torsion spring or a compression spring, and the first elastic member 7 may also be a torsion spring, which can be flexibly selected according to actual needs.

[0036] The working principle of the circuit breaker operating mechanism of the utility model is as follows:

[0037] When closing the circuit breaker, the manual driving knob 4 rotates clockwise, and the end of the connecting rod 5 abuts against the locking opening 19, thereby driving the rotating wheel 6 and the tripping buckle 17 to rotate clockwise. The rotating wheel 6 drives the moving contact frame 20 to rotate clockwise through the first elastic member 7, so that the moving contact 21 is in contact with the static contact.

[0038] When an overcurrent, overload or other fault occurs, the trip button 17 rotates counterclockwise relative to the rotating wheel 6 under the action of external force. After the locking opening 19 is opened, the end of the connecting rod 5 moves out from the opened locking opening 19, and the rotating wheel 6 rotates counterclockwise under the action of the reset spring 200, thereby driving the moving contact frame 20 to rotate counterclockwise, so that the moving contact is separated and disconnected from the static contact.

[0039] In the operating mechanism of the circuit breaker provided by the utility model, the knob 4 is installed at the middle position of the housing 1, so that even if the circuit breaker is installed in a narrow space, it is convenient to manually operate the knob, thereby facilitating use by users.

[0040] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. An operating mechanism of a circuit breaker, characterized in that: include: A knob (4) is rotatably mounted on the housing (1), and the knob (4) drives the rotating wheel (6) to rotate via a connecting rod (5); A rotating wheel (6) is rotatably mounted on the housing (1); a first elastic member (7) is provided between the rotating wheel (6) and the moving contact assembly (3), and the moving contact assembly (3) is driven to rotate by the first elastic member (7); A jump button (17) is rotatably mounted on the housing (1), a third elastic member (18) is provided between the jump button (17) and the rotating wheel (6), a locking opening (19) for inserting the end of the connecting rod (5) is formed between the jump button (17) and the rotating wheel (6) under the elastic force of the third elastic member (18), and the end of the connecting rod (5) abuts against the locking opening (19) during the closing process; A moving contact assembly (3) comprises a moving contact frame (20) and a moving contact (21) fixed on the moving contact frame (20).

2. The operating mechanism of the circuit breaker according to claim 1, characterized in that , the knob (4) is installed at the middle position of the housing (1).

3. The operating mechanism of the circuit breaker according to claim 1, characterized in that The jump button (17), the rotating wheel (6) and the moving contact frame (20) all rotate around the same first rotating shaft (22).

4. The operating mechanism of the circuit breaker according to claim 3, characterized in that: The first elastic member (7) is arranged at the end of the rotating wheel (6) of the first rotating shaft (22) away from the moving contact (21).

5. The operating mechanism of the circuit breaker according to any one of claims 1 to 4, characterized in that , further comprising a return spring (200), one end of the return spring (200) being connected to the rotating wheel (6), and the other end being connected to the housing (1), the return spring (200) being suitable for applying an elastic force to the rotating wheel (6) to move it in the direction of the opening position.

6. The operating mechanism of the circuit breaker according to claim 1, characterized in that: The trip latch (17) comprises a first rotating arm (201) and a second rotating arm (202) located on both sides of its rotation center; the first rotating arm (201) is arranged corresponding to the push rod (65) of the overcurrent tripping mechanism (104); and the locking opening (19) is formed between the end of the second rotating arm (202) and the rotating wheel (6).

7. The operating mechanism of the circuit breaker according to claim 5, characterized in that: The return spring (200) and the first elastic member (7) are both tension springs.

8. The operating mechanism of the circuit breaker according to claim 1, characterized in that: The third elastic member (18) is a compression spring.

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