A molded case circuit breaker

Abstract

This utility model belongs to the field of circuit breaker technology, and particularly relates to a molded case circuit breaker, including a base and a cover plate, and further including a tripping operating mechanism, a moving contact assembly, an arc extinguishing cover, and a wiring assembly mounted on the base. The tripping operating mechanism includes an operating handle and a transmission link. The operating handle is used to control the movement of the transmission link, and the transmission link is used to control the action of the moving contact assembly. The cover plate is also provided with a locking mechanism, including: a fixed bracket mounted on the inner side of the cover plate; a lock cylinder rotatably mounted on the cover plate along the XZ plane and provided with a pusher; a locking member rotatably mounted on the fixed bracket along the XY plane; a reset member mounted on the fixed bracket; and a pusher member used to push the locking member to rotate along the XY plane. The beneficial effect of this utility model is that by inserting a key to rotate the lock cylinder, the operating handle is locked and limited, ensuring that the operating handle will not rotate due to accidental contact during maintenance, ensuring that the circuit is always in an open circuit state, and improving maintenance safety.

Description

Technical Field

[0001] This utility model belongs to the field of circuit breaker technology, and in particular relates to a molded case circuit breaker. Background Technology

[0002] Molded case circuit breakers, also known as modular circuit breakers, house the contacts, arc-extinguishing chamber, trip unit, and operating mechanism within a plastic casing, and are manually operated to close. The operating mechanism typically includes a mechanical handle and a transmission linkage. The mechanical handle controls the force that moves the linkage to control the connection between the stationary and moving contacts. In current technology, when performing circuit maintenance, it is usually necessary to rotate the mechanical handle on the circuit breaker to keep the stationary and moving contacts open, thus disconnecting the circuit and ensuring safe maintenance for personnel. However, because the mechanical handle can be rotated by external forces, there is a risk that the circuit could remain open, posing a safety hazard to maintenance personnel. Utility Model Content

[0003] The purpose of this utility model is to provide a molded case circuit breaker to address the aforementioned technical problems.

[0004] In view of this, the present invention provides a molded case circuit breaker, including a base and a cover plate, and further including a tripping operating mechanism, a moving contact assembly, an arc-extinguishing cover, and a wiring assembly mounted on the base. The tripping operating mechanism includes an operating handle and a transmission link. The operating handle is used to control the movement of the transmission link, and the transmission link is used to control the moving contact assembly to perform closing and opening actions. The cover plate is also provided with a locking mechanism, which includes: A fixing bracket is installed on the inner side of the cover plate; The lock cylinder is rotatably mounted on the cover plate along the XZ plane, passes through the fixed bracket along the Y direction, and is provided with a pusher. A locking element, which is rotatably mounted on a fixed bracket along the XY plane, is used to restrict the movement of the transmission link; A reset component, which is mounted on a fixed bracket, is used for the rotational reset of the locking component; The pusher is used to push the locking member to rotate along the XY plane.

[0005] Furthermore, the locking element includes: A fixing plate, the two ends of which are rotatably connected to a fixing bracket along the XY plane; A limiting rod is integrally connected to the side of the fixing plate away from the cover plate; The end of the limiting rod is used to abut against the transmission link to restrict the movement of the transmission link.

[0006] Furthermore, the locking element also includes: Limiting block, which is set on the fixed plate, is used to abut against the fixed bracket.

[0007] Furthermore, the reset element is a spring, with one end of the spring connected to the fixed bracket and the other end connected to the fixed plate.

[0008] The beneficial effects of this utility model are: When using this molded case circuit breaker, if a circuit needs maintenance, the operator pushes the neutral handle to disconnect the circuit, and then inserts the key to turn the lock cylinder to lock the handle to its limit. This ensures that the handle will not be accidentally turned during maintenance, and that the circuit is always in an open state, effectively improving maintenance safety. Attached Figure Description

[0009] Figure 1 This is a partial front view of the structure of this utility model; Figure 2 This is a partial structural diagram of the back of this utility model; Figure 3 This is a partial structural diagram of the rear side of this utility model from another perspective; The markings in the diagram are as follows: 1. Cover plate; 2. Transmission connecting rod; 21. Abutment part; 3. Fixed bracket; 31. Mounting hole; 4. Lock cylinder; 5. Pushing component; 6. Locking component; 61. Fixed plate; 62. Limiting rod; 63. Limiting block; 64. Connecting column; 7. Fixed hole. Detailed Implementation

[0010] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0011] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0012] Example 1:

[0013] This embodiment provides a molded case circuit breaker, including a base and a cover plate 1, and further including a tripping operating mechanism, a moving contact assembly, an arc-extinguishing cover, and a wiring assembly mounted on the base. The tripping operating mechanism includes an operating handle and a transmission link 2. The operating handle is used to control the movement of the transmission link 2, and the transmission link 2 is used to control the moving contact assembly to perform closing and opening actions. The cover plate 1 is also provided with a locking mechanism, which includes: Fixed bracket 3, which is installed on the inner side of cover plate 1; Lock cylinder 4 is rotatably mounted on cover plate 1 along the XZ plane. Lock cylinder 4 passes through fixed bracket 3 along the Y direction and is provided with pusher 5. Locking member 6, which is rotatably mounted on fixed bracket 3 along the XY plane, is used to restrict the movement of transmission link 2; A reset component, which is mounted on the fixed bracket 3, is used for the rotational reset of the locking component 6; The pusher 5 is used to push the locking member 6 to rotate along the XY plane.

[0014] In this technical solution, the operator inserts the matching key into the lock cylinder 4, and then rotates the lock cylinder 4 along the XZ plane, causing the pusher 5 on the lock cylinder 4 to rotate together. The rotation of the pusher 5 will contact the locking member 6 and push it to rotate along the XY plane. At the same time, the reset member deforms. After the locking member 6 rotates, it abuts against the transmission link 2, restricting the movement of the transmission link 2, thereby achieving the locking and limiting of the control handle, making it unable to rotate.

[0015] By rotating the lock cylinder 4 to reset, the pusher 5 no longer abuts against the locking part 6. At the same time, the reset part restores its shape and drives the locking part 6 to rotate and reset, so that the transmission link 2 is no longer restricted by the locking part 6, thus allowing the operator to operate the control handle to rotate.

[0016] In summary, when using this molded case circuit breaker, if a circuit needs maintenance, the operator can push the neutral handle to disconnect the circuit and then insert the key to turn the lock cylinder 4 to lock the control handle to its limit. This ensures that the control handle will not be accidentally turned during maintenance, and that the circuit is always in an open state, effectively improving maintenance safety.

[0017] Example 2:

[0018] This embodiment provides a molded case circuit breaker, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0019] Furthermore, the locking member 6 includes: The fixing plate 61 is rotatably connected to the fixing bracket 3 at both ends along the X direction in the XY plane; Limiting rod 62, the limiting rod 62 is integrally connected to the side of the fixing plate 61 away from the cover plate 1; The end of the limiting rod 62 is used to abut against the transmission link 2 to restrict the movement of the transmission link 2.

[0020] In this technical solution, mounting holes 31 are provided on both sides of the fixed bracket 3 along the X direction. Connecting posts 64 are provided on both ends of the fixed plate 61 along the X direction. The two connecting posts 64 are inserted into the two mounting holes 31 along the X direction, allowing the fixed plate 61 to rotate along the XY plane. An integral limiting rod 62 is provided on the side of the fixed plate 61 away from the cover plate 1. An integral abutment part 21 is provided on the transmission connecting rod 2. The limiting rod 62 is bent, and its end is used to abut against the abutment part 21. When the pusher 5 on the lock cylinder 4 rotates along the XZ plane with the lock cylinder 4, the pusher 5 abuts against and pushes the end of the fixed plate 61 near the cover plate 1 to rotate away from the cover plate 1 along the YZ plane. This causes the limiting rod 62 to rotate along the YZ plane and approach the transmission connecting rod 2, allowing the limiting rod 62 to abut against the abutment part 21 of the transmission connecting rod 2, thus locking and fixing the transmission connecting rod 2.

[0021] Furthermore, the locking component 6 also includes a limiting block 63, which is disposed on the fixing plate 61 and is used to abut against the fixing bracket 3. An integral limiting block 63 is provided on the side of the fixing plate 61 near the cover plate 1. The limiting block 63 is arranged in an "L" shape. The limiting block 63 and the fixing bracket 3 abut against each other to restrict the rotation and reset of the fixing plate 61. And when it is matched with the reset component, the locking component 6 can remain stationary when the lock cylinder 4 is not rotating.

[0022] Furthermore, the reset component is a spring, with one end connected to the fixed bracket 3 and the other end connected to the fixed plate 61. By providing fixing holes 7 on the fixed bracket 3 and the fixed plate 61, the two ends of the spring (not shown in the accompanying drawings) are hooked onto the two fixing holes 7 respectively, thus achieving the installation of the reset component.

[0023] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A molded case circuit breaker, comprising a base and a cover plate (1), further comprising a tripping operating mechanism, a moving contact assembly, an arc-extinguishing cover, and a wiring assembly mounted on the base, wherein the tripping operating mechanism comprises an operating handle and a transmission link (2), the operating handle being used to control the movement of the transmission link (2), and the transmission link (2) being used to control the moving contact assembly to perform closing and opening actions, characterized in that, The cover plate (1) is also provided with a locking mechanism, the locking mechanism including: A fixed bracket (3) is installed on the inner side of the cover plate (1); Lock cylinder (4), the lock cylinder (4) is rotatably mounted on the cover plate (1) along the XZ plane, the lock cylinder (4) passes through the fixed bracket (3) along the Y direction, and a pusher (5) is provided on the lock cylinder (4). Locking member (6), which is rotatably mounted on fixed bracket (3) along the XY plane, is used to restrict the movement of transmission link (2); A reset component, which is mounted on a fixed bracket (3) and is used for the rotational reset of the locking component (6); The pusher (5) is used to push the locking member (6) to rotate along the XY plane.

2. A molded case circuit breaker according to claim 1, characterized in that, The locking element (6) includes: The fixing plate (61) is rotatably connected to the fixing bracket (3) at both ends along the X direction in the X-direction; Limiting rod (62), the limiting rod (62) is integrally connected to the side of the fixing plate (61) away from the cover plate (1); The end of the limiting rod (62) is used to abut against the transmission link (2) to restrict the movement of the transmission link (2).

3. A molded case circuit breaker according to claim 2, characterized in that, The locking element (6) further includes: Limiting block (63), which is disposed on fixing plate (61) and is used to abut against fixing bracket (3).

4. A molded case circuit breaker according to claim 2, characterized in that, The reset component is a spring, with one end of the spring connected to the fixed bracket (3) and the other end connected to the fixed plate (61).

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