An operating mechanism for a residual current circuit breaker

Abstract

This utility model belongs to the field of circuit breakers, specifically relating to an operating mechanism for a residual current operated circuit breaker. It includes a frame, handle, moving contact frame, connecting rod, torsion spring, latch, and latch torsion spring. A trip latch, which engages with the latch, is rotatably mounted within the frame. A trip latch torsion spring is positioned between the trip latch and the frame. The moving contact frame is linked to the handle and rotates relative to the frame, having both an open and a closed position. The connecting rod is also linked to the moving contact frame. When the moving contact frame rotates in the closing direction, it engages the connecting rod with the trip latch, keeping the moving contact frame in the closed position. This operating mechanism integrates the handle, connecting rod, trip latch, and latch within the frame, employing a modular design that facilitates modular assembly. The simple design of this operating mechanism, with the handle driving the connecting rod to engage with the trip latch via the contact frame, keeps the moving contact frame in the closed state, thus improving the reliability of the opening and closing operation.

Description

Technical Field

[0001] This utility model belongs to the field of circuit breaker technology, specifically relating to an operating mechanism for a residual current operated circuit breaker. Background Technology

[0002] Residual current operated circuit breakers (RCCBs) can quickly disconnect faulty power sources within a very short time, protecting the safety of personnel and electrical equipment. RCCBs are suitable for AC 50Hz or 60Hz circuits with rated voltages of single-pole two-wire, two-pole 230V, three-pole / three-pole four-wire, four-pole 400V, and rated currents up to 60A. When a person experiences electric shock or the leakage current in the power grid exceeds the specified value, the RCCB can quickly disconnect the faulty power source within a very short time, protecting the safety of personnel and electrical equipment.

[0003] The existing residual current operated circuit breaker has a complex operating mechanism with a large number of parts, which greatly affects the reliability of the circuit breaker's opening and closing. In addition, the operating mechanism cannot be integrated and modularized, making assembly cumbersome. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide an operating mechanism for a residual current operated circuit breaker with a simple structural design that ensures the circuit breaker can reliably open and close.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An operating mechanism for a residual current operated circuit breaker includes a frame, a handle rotatably mounted on the frame, a movable contact, a connecting rod rotatably mounted within the frame, a torsion spring mounted on the connecting rod, a latch rotatably mounted within the frame, and a latch torsion spring mounted on the latch. A trip latch is rotatably mounted within the frame and engages with the latch. A trip latch torsion spring is provided between the trip latch and the frame. The movable contact is linked to the handle. The movable contact rotates relative to the frame and has an open position and a closed position. The connecting rod is linked to the movable contact. When the movable contact rotates in the closing direction, it engages the connecting rod with the trip latch and keeps the movable contact in the closed position.

[0006] In some embodiments, a U-shaped connecting rod is linked to the handle, a sliding groove is provided on the movable contact frame, and one end of the U-shaped connecting rod has a driving part that is slidably disposed in the sliding groove. The U-shaped connecting rod drives the driving part to slide in the sliding groove, thus forming a linkage between the movable contact frame and the U-shaped connecting rod.

[0007] In some embodiments, one end of the jump buckle is provided with a fastening groove, and one end of the connecting rod has a fastening protrusion that engages with the fastening groove.

[0008] In some embodiments, the other end of the buckle is provided with a locking protrusion, and the buckle is provided with a locking groove that engages with the locking protrusion.

[0009] In some embodiments, the other end of the connecting rod has a linkage rod, and the movable contact frame has a driving ramp that abuts against the linkage rod.

[0010] In some embodiments, a reset member is rotatably provided within the mechanism frame to drive the latch to perform a release action. A reset torsion spring is provided between the reset member and the mechanism frame. The reset member has a drive arm, and the latch has an unlocking arm that cooperates with the drive arm. The reset member causes the drive arm to abut against the unlocking arm to achieve the release of the latch from the release latch.

[0011] In some embodiments, the reset member has a linkage arm that extends outside the frame and engages with the electromagnetic trip unit.

[0012] In some embodiments, the mechanism frame includes a base frame and a cover plate. The base frame is provided with a plurality of positioning shafts. The handle, connecting rod, jumper, lock, and reset component are rotatably mounted on the plurality of positioning shafts. The cover plate is mounted on the base frame and covers the handle, connecting rod, jumper, lock, and reset component.

[0013] In some embodiments, the base frame is provided with a plurality of snap-fit ​​posts facing the cover plate, and the cover plate is provided with a plurality of snap-fit ​​holes that engage with the plurality of snap-fit ​​posts.

[0014] In some embodiments, the movable contact frame is provided with a positioning boss on the side facing the cover plate, and the cover plate is provided with a positioning hole that engages with the positioning boss.

[0015] The beneficial effects of this utility model are as follows: The operating mechanism integrates the handle, connecting rod, jumper, and lock into the mechanism frame and adopts a modular structure design, which is conducive to the modular assembly of the operating mechanism. The operating mechanism has a simple structure design. The handle drives the connecting rod to engage with the jumper through the contact frame, thereby keeping the moving contact frame in the closed state, which helps to improve the opening and closing reliability of the operating mechanism. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0017] Figure 1This is a perspective view of an embodiment of the present utility model; Figure 2 This is an exploded view of an embodiment of the present utility model; Figure 3 This is a top view of the internal structure of an embodiment of the present utility model. Detailed Implementation

[0018] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0020] The directional and positional terms used in this utility model, such as up, down, front, back, left, right, inside, outside, top, bottom, side, etc., are only for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0021] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments: like Figure 1-3 As shown, an operating mechanism for a residual current operated circuit breaker includes a frame 1, a handle 2 rotatably mounted on the frame 1, a movable contact 3 rotatably mounted inside the frame 1, a torsion spring 5 mounted on the connecting rod 4, a latch 6 rotatably mounted inside the frame 1, and a latch torsion spring 7 mounted on the latch 6. A trip latch 8 is rotatably mounted inside the frame 1 and engages with the latch 6. A trip latch torsion spring 9 is provided between the trip latch 8 and the frame 1. The movable contact 3 is linked to the handle 1 and rotates relative to the frame 1, having an open position and a closed position. The connecting rod 4 is linked to the movable contact 3. When the movable contact 3 rotates in the closing direction, it engages the connecting rod 4 with the trip latch 8 and keeps the movable contact 3 in the closed position.

[0022] like Figure 2As shown, a U-shaped connecting rod 21 is linked to the handle 2, and a sliding groove 30 is provided on the movable contact frame 3. One end of the U-shaped connecting rod 21 has a driving part 211 that is slidably disposed in the sliding groove 30. The U-shaped connecting rod 21 drives the driving part 211 to slide within the sliding groove 30, thus forming a linkage between the movable contact frame 3 and the U-shaped connecting rod 21. The handle drives the movable contact frame through the U-shaped connecting rod, thereby ensuring more reliable transmission between the handle and the movable contact frame, and facilitating the assembly of the handle, contact frame, and U-shaped connecting rod, resulting in higher assembly efficiency. One end of the jump buckle 8 is provided with a locking groove 81, and one end of the connecting rod 4 has a locking protrusion 41 that engages with the locking groove 81. The connecting rod engages with the locking groove of the jump buckle through the locking protrusion, thereby ensuring reliable engagement between the connecting rod and the jump buckle, which helps to improve the working reliability of the operating mechanism. The other end of the jump buckle 8 is provided with a locking protrusion 82, and the lock buckle 6 is provided with a locking groove 61 that engages with the locking protrusion 82. The jump catch engages with the locking groove of the latch via a locking protrusion, ensuring reliable engagement between the jump catch and the latch, thus improving the operational reliability of the operating mechanism. The other end of the connecting rod 4 has a linkage rod 42, and the moving contact 3 has a driving inclined surface 31 that abuts against the linkage rod 42. The moving contact 3 pushes the linkage rod of the connecting rod via the driving inclined surface, ensuring more reliable transmission between the moving contact 3 and the connecting rod.

[0023] like Figure 2 and 3As shown, a reset member 10 is rotatably mounted inside the frame 1 to drive the latch 6 to perform a tripping action. A reset torsion spring 101 is provided between the reset member 10 and the frame 1. The reset member 10 has a drive arm 102, and the latch 6 has an unlocking arm 62 that cooperates with the drive arm 102. The reset member 10 causes the drive arm 102 to abut against the unlocking arm 62, thereby achieving the tripping of the latch 6 and the trip latch 8. The reset member 10 has a linkage arm 103 extending outside the frame 1 and cooperating with the electromagnetic trip unit. When a circuit abnormality occurs, the electromagnetic trip unit drives the reset member to operate through the linkage arm. The reset member abuts against the unlocking arm of the latch through the drive arm, and the latch and the trip latch perform a tripping action, thereby realizing the rapid tripping and opening of the operating mechanism. The frame 1 includes a base frame 11 and a cover plate 12. Multiple positioning shafts 111 are respectively provided on the base frame 11. The handle 2, connecting rod 4, jumper 8, lock 6, and reset component 10 are rotatably mounted on the positioning shafts 111. The cover plate 12 is mounted on the base frame 11 and covers the handle 2, connecting rod 4, jumper 8, lock 6, and reset component 10. The base frame is connected to the handle, connecting rod, jumper 8, lock 6, and reset component via the multiple positioning shafts, facilitating assembly of the base frame with these components and improving assembly efficiency. Multiple locking posts 112 are respectively provided on the base frame 11 facing the cover plate 12, and multiple locking holes 121 are respectively provided on the cover plate 12 to engage with the locking posts 112. The base frame is engaged with the cover plate via the multiple locking posts, facilitating assembly of the base frame and cover plate and making assembly more convenient. The movable contact 3 is provided with a positioning boss 32 on the side facing the cover plate 12, and the cover plate 12 is provided with a positioning hole 122 that engages with the positioning boss 32. The movable contact is engaged in the positioning hole of the cover plate through the positioning boss, so that the movable contact can reliably move within the mechanism frame.

[0024] This operating mechanism integrates the handle, connecting rod, trip latch, and lock within the frame, employing a modular design that facilitates modular assembly. The mechanism's simple structure allows the handle to drive the connecting rod via the contact frame, engaging the trip latch and keeping the moving contact in the closed position, thus improving the reliability of the opening and closing mechanism. During operation, the operator rotates the handle, which drives the moving contact via the U-shaped connecting rod. The moving contact then drives the connecting rod, engaging the trip latch and lock, keeping the moving contact in the closed position.

[0025] The above description is only one embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model; the scope of protection of the present utility model is defined by the claims in the claims, and all equivalent changes and modifications made in accordance with the utility model are within the scope of protection of the present utility model patent.

Claims

1. An operating mechanism for a residual current operated circuit breaker, characterized in that: The device includes a frame, a handle and a movable contact rotatably mounted on the frame, a connecting rod rotatably mounted within the frame, a torsion spring mounted on the connecting rod, a latch rotatably mounted within the frame, and a latch torsion spring mounted on the latch. A jump catch that engages with the latch is rotatably mounted within the frame. A jump catch torsion spring is provided between the jump catch and the frame. The movable contact is linked to the handle. The movable contact rotates relative to the frame and has an open position and an closed position. The connecting rod is linked to the movable contact. When the movable contact rotates in the closing direction, it engages the connecting rod with the jump catch and keeps the movable contact in the closed position.

2. The operating mechanism of the residual current operated circuit breaker according to claim 1, characterized in that: The handle is linked with a U-shaped connecting rod, the movable contact frame is provided with a sliding groove, and one end of the U-shaped connecting rod has a driving part that is slidably disposed in the sliding groove. The U-shaped connecting rod drives the driving part to slide in the sliding groove, thus forming a linkage between the movable contact frame and the U-shaped connecting rod.

3. The operating mechanism of the residual current operated circuit breaker according to claim 1, characterized in that: The jump buckle has a locking groove at one end, and the connecting rod has a locking protrusion at one end that engages with the locking groove.

4. The operating mechanism of the residual current operated circuit breaker according to claim 3, characterized in that: The other end of the buckle is provided with a locking protrusion, and the buckle is provided with a locking groove that engages with the buckle protrusion.

5. The operating mechanism of the residual current operated circuit breaker according to claim 3, characterized in that: The other end of the connecting rod has a linkage rod, and the movable contact frame has a driving inclined surface that abuts against the linkage rod.

6. The operating mechanism of the residual current operated circuit breaker according to claim 1, characterized in that: The mechanism frame is rotatably equipped with a reset member for driving the latch to perform a release action. A reset torsion spring is provided between the reset member and the mechanism frame. The reset member has a drive arm, and the latch has an unlocking arm that cooperates with the drive arm. The reset member causes the drive arm to abut against the unlocking arm to realize the release of the latch from the release latch.

7. The operating mechanism of the residual current operated circuit breaker according to claim 6, characterized in that: The reset component has a linkage arm that extends outside the mechanism frame and is linked with the electromagnetic trip unit.

8. The operating mechanism of the residual current operated circuit breaker according to claim 6, characterized in that: The mechanism frame includes a base frame and a cover plate. Multiple positioning shafts are respectively provided on the base frame. The handle, connecting rod, jumper, lock, and reset component are rotatably mounted on the multiple positioning shafts. The cover plate is mounted on the base frame and covers the handle, connecting rod, jumper, lock, and reset component.

9. The operating mechanism of the residual current operated circuit breaker according to claim 8, characterized in that: The base frame is provided with multiple snap-fit ​​posts facing the cover plate, and the cover plate is provided with multiple snap-fit ​​holes that engage with the multiple snap-fit ​​posts.

10. The operating mechanism of the residual current operated circuit breaker according to claim 9, characterized in that: The movable contact frame is provided with a positioning boss on the side facing the cover plate, and the cover plate is provided with a positioning hole that engages with the positioning boss.

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