Residual current module of miniature residual current circuit breaker

Abstract

The present invention relates to a residual current module of a miniature residual current circuit breaker, comprising a handle, a lock catch, a trip latch, a torsion spring, a contact holder rotatably provided in a housing, a spring provided between the contact holder and the housing, an N-wire moving contact in linkage cooperation with the contact holder, and a residual current trip assembly provided in the housing and cooperating with the trip latch; the handle is connected to the lock catch by means of a connecting rod, one end of the lock catch being connected to the contact holder by means of a U-shaped connecting rod; the residual current trip assembly comprises an electromagnetic trip unit, a linkage rod slidably provided in the housing and in linkage cooperation with the electromagnetic trip unit, and a push rod rotatably provided in the housing and in linkage cooperation with the linkage rod; the push rod has a driving plane abutting against one end of the trip latch, and the driving plane moves along with the push rod and drives the trip latch to act, so as to unlock the trip latch and the lock catch. The present invention has the advantages of simple structure, stable and reliable performance, fast opening and closing speed, flexible operation and sensitive tripping action.

Description

Leakage current module of small leakage circuit breaker Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and in particular to a leakage module of a small leakage circuit breaker. Background Art

[0002] Currently, miniature circuit breakers, also known as miniature circuit breakers, are suitable for overload and short-circuit protection in AC 50 / 60Hz circuits with a rated voltage of 230 / 400V and a rated current not exceeding 125A. They can also be used for infrequent line switching under normal conditions. Miniature circuit breakers are primarily used in various locations, including industrial, commercial, high-rise, and residential buildings. Miniature leakage circuit breakers (LRCBs) are switches that automatically activate when the leakage current in a circuit exceeds a predetermined value, protecting personnel and electrical appliances. They consist of multiple L-line circuit breaker units and an N-line leakage protection module assembled with these L-line circuit breaker units.

[0003] For example, Chinese patent application number CN201710462871.9 discloses a residual current tripping mechanism and circuit breaker, and proposes a leakage protection unit with an eccentric tripping action at an unfixed point. Although this leakage protection unit improves the tripping process, making tripping more labor-saving and the leakage protection unit functioning safely and reliably, during the tripping process, the point of application of the reset plate to the lock thrust is prone to offset, causing the tripping force to vary, resulting in unstable tripping force and unreliable tripping performance. Furthermore, the structural design of the existing N-line leakage protection module is relatively complex, the leakage protection module's opening and closing action is relatively slow, the breaking capacity is weak, and the leakage tripping action is not sensitive. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a leakage module for a small leakage circuit breaker with a simple structure, stable and reliable performance, fast opening and closing speed, flexible operation, and sensitive tripping action.

[0005] To achieve the above-mentioned objectives, the present invention adopts a leakage module of a small leakage circuit breaker, including a handle rotatably arranged in a shell, a lock slidably arranged in the shell, a trip button rotatably arranged in the shell and locked with the lock button, a torsion spring arranged between the trip button and the shell, a contact frame rotatably arranged in the shell, a spring arranged between the contact frame and the shell, an N-line moving contact cooperating with the contact frame, and a leakage trip assembly arranged in the shell and cooperating with the trip button. The handle is connected to the lock button through a connecting rod, and one end of the lock button is connected to the contact frame through a U-shaped connecting rod. The leakage trip assembly includes an electromagnetic trip, a linkage rod slidably arranged in the shell and cooperating with the electromagnetic trip, and a push rod rotatably arranged in the shell and cooperating with the linkage rod. The push rod has a driving plane that abuts against one end of the trip button. The driving plane moves with the push rod and drives the trip button to move, thereby unlocking the trip button and the lock button.

[0006] The beneficial effects of the above structure are: a four-link structure design is adopted between the handle and the lock buckle, the trip buckle, and the contact frame, thereby ensuring that the operating torque of the leakage module is evenly distributed, avoiding the situation of excessive or too light operation, and making the operation more flexible. The lock buckle adopts a sliding structure design, the handle drives the lock buckle to slide through the connecting rod, and the lock buckle drives the N-line moving contact frame through the U-shaped connecting rod to quickly perform the opening and closing action, thereby realizing the rapid opening and closing of the circuit breaker, and the opening and closing speed of the operating mechanism is faster. When the leakage trips, the arc locking groove of the lock buckle is buckled on the trip buckle, and the electromagnetic tripper and the bimetallic strip can drive the trip buckle action respectively. The trip buckle can be quickly unlocked with the lock buckle, the tripping action is more sensitive, and the reliability is higher. Therefore, the leakage module of the small circuit breaker has the advantages of simple structure, stable and reliable performance, fast opening and closing speed, flexible operation, and sensitive tripping action.

[0007] Specifically, the other end of the lock buckle has a curved locking groove that mates with the jump buckle, and one end of the jump buckle has a curved raised bearing surface that mates with the curved locking groove. The curved locking groove rotates with the lock buckle and can engage with the curved raised bearing surface of the jump buckle, thereby locking the lock buckle and the jump buckle. The provision of the curved raised bearing surface on the jump buckle that mates with the curved locking groove ensures a more sensitive disengagement of the jump buckle from the lock buckle.

[0008] Specifically, the handle is provided with a shaft hole connected to the connecting rod. One end of the connecting rod is inserted into the shaft hole. The lock catch is provided with a drive hole that cooperates with the connecting rod. The other end of the connecting rod has a guide rod portion that passes through the guide hole of the housing and connects to the drive hole. The guide rod portion of the connecting rod moves with the handle and reciprocates within the guide hole. The lock catch is slidably disposed within the housing via the connecting rod, facilitating assembly of the lock catch with the housing and ensuring reliable operation within the housing. The lock catch can quickly drive the N-wire contact holder, accelerating the opening and closing speed of the operating mechanism and enhancing operational reliability.

[0009] Specifically, one end of the linkage rod has a guide portion that abuts against the push rod of the electromagnetic release. A guide groove is provided within the housing that cooperates with the guide portion. The guide portion moves with the linkage rod and reciprocates within the guide groove. The linkage rod guide portion slides within the housing guide groove, thereby ensuring reliable sliding of the linkage rod within the housing.

[0010] In particular, the other end of the linkage rod has a snap-fit ​​hole, and the push rod is provided with a snap-fit ​​post that cooperates with the snap-fit ​​hole. The snap-fit ​​post engages within the snap-fit ​​hole, forming a snap-fit ​​connection between the snap-fit ​​post and the push rod. The snap-fit ​​connection between the linkage rod and the push rod facilitates assembly of the linkage rod and the push rod, and ensures more reliable transmission between the linkage rod and the push rod.

[0011] Specifically, a rotating shaft is disposed within the housing and engages with the push rod. A positioning hole is provided on the push rod and engages with the rotating shaft. The rotating shaft is inserted into the positioning hole and forms a rotational connection between the rotating shaft and the push rod. The push rod is rotatably mounted on the rotating shaft within the housing, thereby facilitating assembly of the push rod and the rotating shaft, making assembly more convenient and ensuring that the push rod can reliably rotate within the housing.

[0012] In particular, a contact torsion spring is provided between the contact frame and the N-line moving contact. The spring engages with the contact frame's positioning boss, with its two ends respectively engaging the first and second limiting grooves of the N-line moving contact. The spring increases the contact pressure of the N-line moving contact, thereby ensuring reliable contact between the N-line moving contact and the N-line stationary contact. Furthermore, the N-line moving contact and the contact frame are assembled using a snap-fit ​​mechanism, which improves assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG1 is a perspective view of an embodiment of the present invention.

[0014] FIG2 is a front view of an embodiment of the present invention.

[0015] FIG3 is an exploded view of an embodiment of the present invention. DETAILED DESCRIPTION

[0016] As shown in Figures 1 to 3, the embodiment of the present invention is a leakage module of a small leakage circuit breaker, including a handle 11 rotatably arranged in a housing 10, a lock 12 slidably arranged in the housing 10, a trip button 13 rotatably arranged in the housing 10 and locked with the lock, a torsion spring 14 arranged between the trip button 13 and the housing 10, a contact frame 15 rotatably arranged in the housing 10, a spring 16 arranged between the contact frame 15 and the housing 10, an N-line moving contact 17 linked with the contact frame 15, and a leakage trip assembly 20 arranged in the housing 10 and cooperating with the trip button 13. 11 is connected to the lock buckle 12 through a connecting rod 18, one end of the lock buckle 12 is connected to the contact frame 15 through a U-shaped connecting rod 19, and the leakage trip assembly 20 includes an electromagnetic tripper 21, a linkage rod 22 slidably arranged in the housing 10 and linked with the electromagnetic tripper 21, and a push rod 23 rotatably arranged in the housing 10 and linked with the linkage rod 22. The push rod 23 has a driving plane 231 that abuts against one end of the trip buckle 13. The driving plane 231 moves with the push rod 23 and drives the trip buckle 13 to move, thereby unlocking the trip buckle 13 and the lock buckle 12. The other end of the lock buckle 12 has an arcuate locking groove 121 that cooperates with the jump buckle 13. The one end of the jump buckle 13 has an arcuate raised bearing surface 131 that cooperates with the arcuate locking groove 121. The arcuate locking groove 121 rotates with the lock buckle 12 and can be engaged with the arcuate raised bearing surface 131 of the jump buckle 13, thereby locking the lock buckle 12 and the jump buckle 13. The arcuate raised bearing surface on the jump buckle that cooperates with the arcuate locking groove ensures that the jump buckle and the lock buckle can be released more sensitively. The handle 11 is provided with a shaft hole 111 connected to the connecting rod 18. One end of the connecting rod 18 is inserted into the shaft hole 111. The lock catch 12 is provided with a drive hole 122 that cooperates with the connecting rod 18. The other end of the connecting rod 18 has a guide rod portion 181 that passes through the guide hole 101 of the housing 10 and connects to the drive hole 122. The guide rod portion 181 of the connecting rod 18 moves with the handle 11 and reciprocates within the guide hole 101. The lock catch is slidably disposed within the housing via the connecting rod, which facilitates assembly of the lock catch with the housing and ensures that the lock catch can operate reliably within the housing. The lock catch can quickly drive the N-line contact frame to operate, which helps to accelerate the opening and closing speed of the operating mechanism and improve the reliability of the operation.

[0017] As shown in Figures 2 and 3, one end of the linkage rod 22 has a guide portion 211 that abuts against the push rod 211 of the electromagnetic release 21. A guide groove 102 is provided within the housing 10, which cooperates with the guide portion 211. The guide portion 211 moves with the linkage rod 22 and reciprocates within the guide groove 102. The linkage rod's guide portion slides within the housing's guide groove, ensuring reliable sliding of the linkage rod within the housing. The other end of the linkage rod 22 has a snap-in hole 222. The push rod 23 is provided with a snap-in post 232 that cooperates with the snap-in hole 222. The snap-in post 232 engages within the snap-in hole 222, forming a snap-in fit between the snap-in post 232 and the push rod 23. The snap-in fit between the linkage rod and the push rod facilitates assembly of the linkage rod and the push rod, ensuring more reliable transmission between the two rods. The housing 10 is provided with a rotating shaft 103 that cooperates with the push rod 23. The push rod 23 is provided with a positioning hole 233 that cooperates with the rotating shaft 103. The rotating shaft 103 is inserted into the positioning hole 233 and forms a rotational connection between the rotating shaft 103 and the push rod 23. The push rod is rotatably arranged on the rotating shaft in the housing, thereby facilitating the assembly of the push rod and the rotating shaft, making assembly more convenient and ensuring that the push rod can rotate reliably within the housing. A contact torsion spring 170 is provided between the contact frame 15 and the N-line moving contact 17. The contact torsion spring 170 is engaged with the positioning boss 151 of the contact frame 15. The two ends of the contact torsion spring 170 are respectively engaged with the first limiting groove 171 and the second limiting groove 172 of the N-line moving contact 17. The contact torsion spring can increase the contact pressure of the N-line moving contact, thereby ensuring that the N-line moving contact can reliably contact the N-line static contact, and the N-line moving contact and the contact frame are assembled by a snap-fit ​​method, which is beneficial to improving the assembly efficiency of the N-line moving contact and the contact frame.

[0018] A four-link structure design is adopted between the handle and the lock, trip, and contact frame, which can ensure that the operating torque of the leakage module is evenly distributed, avoid the situation of excessive or light operation, and make the operation more flexible. The lock adopts a sliding structure design. The handle drives the lock to slide through the connecting rod, and the lock drives the N-line movable contact frame through the U-shaped connecting rod to quickly perform the opening and closing action, thereby realizing the rapid opening and closing of the circuit breaker, and the opening and closing speed of the operating mechanism is faster. When the leakage trips, the arc-shaped locking groove of the lock is engaged with the trip, and the electromagnetic release and bimetallic strip can drive the trip action separately. The trip can be quickly unlocked with the lock, and the trip action is more sensitive and more reliable. Therefore, the leakage module of this small circuit breaker has the advantages of simple structure, stable and reliable performance, fast opening and closing speed, flexible operation, and sensitive tripping action.

Claims

1. A leakage module of a small leakage circuit breaker, characterized in that: It includes a handle rotatably arranged in a shell, a lock buckle slidably arranged in the shell, a jump buckle rotatably arranged in the shell and locked with the lock buckle, a torsion spring arranged between the jump buckle and the shell, a contact frame rotatably arranged in the shell, a spring arranged between the contact frame and the shell, an N-line moving contact cooperating with the contact frame, and a leakage tripping assembly arranged in the shell and cooperating with the jump buckle. The handle is connected to the lock buckle through a connecting rod, and one end of the lock buckle is connected to the contact frame through a U-shaped connecting rod. The leakage tripping assembly includes an electromagnetic tripper, a linkage rod slidably arranged in the shell and cooperating with the electromagnetic tripper, and a pushing rod rotatably arranged in the shell and cooperating with the linkage rod. The pushing rod has a driving plane that contacts one end of the jump buckle. The driving plane moves with the pushing rod and drives the jump buckle to move, so as to unlock the jump buckle and the lock buckle.

2. The leakage module of the small leakage circuit breaker according to claim 1, characterized in that: The other end of the lock buckle has an arcuate locking groove that matches the jump buckle, and one end of the jump buckle has an arcuate convex bearing surface that matches the arcuate locking groove. The arcuate locking groove rotates with the lock buckle and can be buckled on the arcuate convex bearing surface of the jump buckle, thereby realizing the locking of the lock buckle and the jump buckle.

3. The leakage module of the small leakage circuit breaker according to claim 1 or 2, characterized in that: The handle is provided with a rotating shaft hole connected to the connecting rod, one end of the connecting rod is inserted into the rotating shaft hole, the lock buckle is provided with a driving hole matching the connecting rod, the other end of the connecting rod has a guide rod portion that passes through the guide hole of the shell and is connected to the driving hole, and the guide rod portion of the connecting rod moves with the handle and slides back and forth in the guide hole.

4. The leakage module of the small leakage circuit breaker according to claim 1 or 2, characterized in that: One end of the linkage rod has a guide part that contacts the push rod of the electromagnetic releaser, and a guide groove matched with the guide part is arranged in the shell. The guide part moves with the linkage rod and slides back and forth in the guide groove.

5. The leakage module of the small leakage circuit breaker according to claim 4, characterized in that: The other end of the linkage rod is provided with a clamping hole, and the push rod is provided with a clamping column matched with the clamping hole. The clamping column is clamped in the clamping hole to form a clamping match between the clamping column and the push rod.

6. The leakage module of the small leakage circuit breaker according to claim 1 or 2, characterized in that: A rotating shaft matched with the push rod is arranged in the shell, a positioning hole matched with the rotating shaft is arranged on the push rod, the rotating shaft is inserted in the positioning hole, and forms a rotational connection match between the rotating shaft and the push rod.

7. The leakage module of the small leakage circuit breaker according to claim 1 or 2, characterized in that: A contact torsion spring is arranged between the contact frame and the N-line moving contact, the contact torsion spring is clamped on the positioning boss of the contact frame, and the two ends of the contact torsion spring are respectively clamped in the first limiting groove and the second limiting groove of the N-line moving contact.

Images