Operating mechanism of circuit breaker

Abstract

The present invention relates to an operating mechanism of a circuit breaker, comprising a handle, a lock latch, a trip latch rotationally arranged in a housing, a torsion spring arranged between the trip latch and the housing, and a contact support rotationally arranged in the housing, a spring arranged between the contact support and the housing, and a moving contact linked and matched with the contact support. The handle is connected to the lock latch by means of a connecting rod; one end of the lock latch is connected to the contact support by means of a U-shaped connecting rod; the other end of the lock latch is provided with a locking groove matched with the trip latch; the locking groove rotates along with the lock latch and can be fastened at one end of the trip latch, to lock the lock latch and the trip latch; and the other end of the trip latch is provided with a tripping part linked and matched with an electromagnetic trip unit and a bimetallic strip, wherein the electromagnetic trip unit and the bimetallic strip can respectively drive the tripping part to act to unlock the lock latch and the trip latch. The present invention has the advantages of simple structure, stable and reliable performance, convenient assembly, high opening and closing speed, and flexible operation.

Description

Operating mechanism of circuit breaker Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and in particular to an operating mechanism of a circuit breaker. Background Art

[0002] Miniature circuit breakers are the most widely used terminal protection devices in building electrical terminal distribution equipment. They provide circuit protection against short circuits, overloads, overvoltages, and other factors. For example, a residual current operated device with overcurrent protection can quickly disconnect faulty power, protecting personnel and electrical equipment, and providing protection against overloads, short circuits, and leakage. The operating mechanism of a circuit breaker is one of its core components, driving the opening and closing of the moving and stationary contacts. Traditional miniature circuit breaker operating mechanisms consist of a handle, contact frame, moving contact, trip latch, and latch. The trip latch and latch are hinged to the contact frame. The handle is linked to the trip latch via a U-shaped connecting rod, and the cooperation between the trip latch and latch activates the operating mechanism. This operating mechanism operates relatively slowly, resulting in a weak breaking capacity. Furthermore, this operating mechanism is complex, cumbersome to assemble, and unreliable. Summary of the Invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide an operating mechanism for a circuit breaker with a simple structure, stable and reliable performance, convenient assembly, fast opening and closing speed, and flexible operation.

[0004] To achieve the above-mentioned purpose, the present invention adopts an operating mechanism of a circuit breaker, including a handle rotatably arranged in a housing, a lock latch slidably arranged in the housing, a trip latch rotatably arranged in the housing, a torsion spring arranged between the trip latch and the housing, a contact frame rotatably arranged in the housing, a spring arranged between the contact frame and the housing, and a moving contact that cooperates with the contact frame. The handle is connected to the lock latch through a connecting rod, one end of the lock latch is connected to the contact frame through a U-shaped connecting rod, the other end of the lock latch has a locking groove that cooperates with the trip latch, the locking groove rotates with the lock latch and can be buckled on one end of the trip latch, thereby locking the lock latch and the trip latch, the other end of the trip latch has a tripping part that cooperates with the electromagnetic trip device and the bimetallic strip, the electromagnetic trip device and the bimetallic strip can respectively drive the tripping part to operate, thereby unlocking the lock latch and the trip latch.

[0005] The beneficial effects of the above structure are: the operating mechanism adopts a four-link structure design, so that the operating torque of the circuit breaker is evenly distributed, avoiding the situation where the circuit breaker is operated with excessive force or too lightly, and the operation is 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 contact frame to quickly perform the opening and closing action through the U-shaped connecting rod, thereby realizing the rapid opening and closing of the circuit breaker, and the opening and closing speed of the operating mechanism is faster. When tripping, the locking groove of the lock is engaged with the tripping buckle, and the electromagnetic release and the bimetallic strip can drive the tripping action respectively. The tripping buckle can be quickly unlocked with the lock buckle, the tripping action is more sensitive, and the reliability is higher. Therefore, the operating mechanism of the circuit breaker has the advantages of simple structure, stable and reliable performance, convenient assembly, fast opening and closing speed, and flexible operation.

[0006] 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 drive hole and extends into the sliding guide hole of the housing. The guide rod portion of the connecting rod slides back and forth within the sliding guide hole as the handle moves. The lock catch is slidably disposed within the housing via the connecting rod, thereby facilitating assembly of the lock catch with the housing and ensuring reliable operation within the housing. The lock catch can quickly drive the contact frame, thereby accelerating the opening and closing speed of the operating mechanism and enhancing operational reliability.

[0007] In particular, the locking groove is an arcuate groove, and one end of the jump buckle has an arcuate convex bearing surface that matches the locking groove. The arcuate convex bearing surface that matches the locking groove is provided on the jump buckle, thereby ensuring that the tripping action of the jump buckle and the lock buckle is more sensitive.

[0008] Specifically, one end of the lock catch has a connection hole that mates with the U-shaped connecting rod. The contact frame is provided with a through hole that mates with the U-shaped connecting rod. A guide groove is provided in the housing corresponding to the through hole. One end of the U-shaped connecting rod is connected to the connection hole, while the other end of the U-shaped connecting rod passes through the through hole and extends into the guide groove. The other end of the U-shaped connecting rod moves with the lock catch and reciprocates within the guide groove. The U-shaped connecting rod connects the contact frame and the lock catch, facilitating assembly of the contact frame and the lock catch. One end of the U-shaped connecting rod slides within the guide groove of the housing, ensuring more reliable transmission between the lock catch and the contact frame.

[0009] Specifically, the contact frame is provided with a positioning boss, the movable contact is provided with a positioning hole that mates with the positioning boss, the positioning boss is inserted into the positioning hole, and a contact torsion spring is provided on the positioning boss. The movable contact is provided with a first limiting groove and a second limiting groove on one side of the positioning boss, respectively, and the ends of the contact torsion spring engage with the first and second limiting grooves, respectively. The contact torsion spring increases the contact pressure of the movable contact, thereby ensuring reliable contact between the movable contact and the stationary contact. Furthermore, the movable contact and the contact frame are assembled using a snap-fit ​​method, which improves assembly efficiency between the movable contact and the contact frame.

[0010] In particular, the contact frame is provided with a positioning post that cooperates with the spring, one end of the spring is engaged with the positioning post, and the other end of the spring is engaged with a slot in the housing. The spring can accelerate the movement of the contact frame, thereby facilitating an increase in the movement speed of the operating mechanism.

[0011] Specifically, a positioning slot is provided on one side of the contact frame corresponding to the positioning post, and a positioning post is provided on the housing corresponding to the positioning slot. The positioning post is inserted into the positioning slot, forming a rotational connection between the contact frame and the positioning post. The contact frame and the housing are assembled using a snap-fit ​​method, which facilitates assembly of the contact frame and the housing and ensures that the contact frame can operate reliably within the housing, thereby improving the operating reliability of the operating mechanism.

[0012] Specifically, a positioning shaft is provided within the housing corresponding to the trip button, inserted into a positioning shaft hole in the middle of the trip button, and a torsion spring is mounted on the positioning shaft. One end of the torsion spring abuts against the trip button's engaging slot, while the other end abuts against a retaining plate in the housing. The trip button rotates on the positioning shaft within the housing, ensuring reliable rotation of the trip button within the housing. The torsion spring also increases the trip button's sensitivity, thereby accelerating the operating mechanism. 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.

[0016] FIG4 is a perspective view of a contact frame according to an embodiment of the present invention. DETAILED DESCRIPTION

[0017] As shown in Figures 1 to 4, an embodiment of the present invention is an operating mechanism of a circuit breaker, comprising a handle 11 rotatably disposed in a housing 10, a lock 12 slidably disposed in the housing 10, a tripping buckle 13 rotatably disposed in the housing 10, a torsion spring 14 disposed between the tripping buckle 13 and the housing 10, a contact frame 15 rotatably disposed in the housing 10, a spring 16 disposed between the contact frame 15 and the housing 10, and a moving contact 17 that cooperates with the contact frame 15. The handle 11 is connected to the lock 12 via a connecting rod 18, one end of the lock 12 is connected to the contact frame 15 via a U-shaped connecting rod 19, and the other end of the lock 12 has a locking groove 120 that cooperates with the tripping buckle 13. The locking groove 120 rotates with the lock 12 and can be buckled on one end of the tripping buckle 13 to achieve locking of the lock 12 and the tripping buckle 13. The tripping buckle 13 The other end has a tripping portion 131 that cooperates with the electromagnetic trip 20 and bimetallic strip 21. The electromagnetic trip 20 and bimetallic strip 21 can respectively drive the tripping portion 131 to unlock the lock catch 12 and the tripping latch 13. The handle 11 is provided with a rotating shaft hole 111 connected to the connecting rod 18. One end of the connecting rod 18 is inserted into the rotating shaft hole 111. The lock catch 12 is provided with a driving hole 121 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 driving hole 121 and extends into the sliding guide hole 101 of the housing 10. The guide rod portion 181 of the connecting rod 18 moves with the handle 11 and slides back and forth within the sliding guide hole 101. The lock catch is slidably mounted within the housing via a connecting rod, facilitating assembly of the lock catch and the housing while ensuring reliable operation within the housing. The lock catch can quickly actuate the contact holder, accelerating the opening and closing speed of the operating mechanism and enhancing operational reliability. The locking groove 120 is an arcuate groove, and the trip catch 13 has a raised arcuate bearing surface 132 on one end that mates with the locking groove 120. This arcuate bearing surface on the trip catch ensures a more sensitive release of the trip catch from the lock catch.

[0018] As shown in Figures 1 and 3 , the lock catch 12 has a connecting hole 122 at one end that mates with a U-shaped connecting rod 19. The contact frame 15 is provided with a through hole 151 that mates with the U-shaped connecting rod 19. A guide slot 102 is provided in the housing 10 corresponding to through hole 151. One end of the U-shaped connecting rod 19 is connected to the connecting hole 122, while the other end passes through through hole 102 and extends within the guide slot 102. The other end of the U-shaped connecting rod 19 moves with the lock catch 12 and reciprocates within the guide slot 102. The contact frame and lock catch are connected by the U-shaped connecting rod, facilitating assembly. One end of the U-shaped connecting rod slides within the housing's guide slot, ensuring more reliable transmission between the lock catch and the contact frame. The contact frame 15 is provided with a positioning boss 152. The movable contact 17 is provided with a positioning hole 170 that mates with the positioning boss 152. The positioning boss 152 is inserted into the positioning hole 170. A contact torsion spring 22 is provided on the positioning boss 152. A first limiting groove 171 and a second limiting groove 172 are provided on one side of the movable contact 17 corresponding to the positioning boss 152. The ends of the contact torsion spring 22 engage with the first limiting groove 171 and the second limiting groove 172, respectively. The contact torsion spring increases the contact pressure of the movable contact, thereby ensuring reliable contact between the movable contact and the stationary contact. The movable contact and the contact frame are assembled using a snap-fit ​​method, which helps improve assembly efficiency. The contact frame 15 is equipped with a positioning post 153 that mates with a spring 16. One end of the spring 16 engages with the positioning post 153, while the other end engages with a slot 103 in the housing 10. The spring accelerates the movement of the contact frame, thereby improving the operating speed of the operating mechanism. A positioning slot 154 is provided on one side of the contact frame 15, corresponding to the positioning post 153. A positioning post 104 is provided on the housing 10, corresponding to the positioning slot 154. The positioning post 104 is inserted into the positioning slot 154, forming a rotational connection between the contact frame 15 and the positioning post 104. The contact frame and the housing utilize a snap-fit ​​assembly, facilitating assembly and ensuring reliable operation of the contact frame within the housing, thereby improving the reliability of the operating mechanism.A positioning shaft 105 is provided within the housing 10, corresponding to the trip button 13. This shaft 105 is inserted into a positioning shaft hole 133 in the center of the trip button 13. A torsion spring 14 is mounted on this shaft. One end of the torsion spring 14 abuts against a retaining groove 134 in the trip button 13, while the other end abuts against a stopper 106 on the housing 10. The trip button rotates on the positioning shaft within the housing, ensuring reliable rotation within the housing. The torsion spring also increases its sensitivity, resulting in faster actuation of the operating mechanism.

[0019] The operating mechanism utilizes a four-link design, which evenly distributes the circuit breaker's operating torque, preventing over- or under-force operation and enhancing operational flexibility. The lock mechanism utilizes a sliding design. The handle drives the lock mechanism to slide via a connecting rod, which in turn drives the contact frame via a U-shaped connecting rod to rapidly open and close the circuit breaker. This allows for rapid opening and closing of the circuit breaker, further accelerating the operating mechanism's opening and closing speeds. During tripping, the lock mechanism's locking groove engages the trip mechanism, and the electromagnetic release and bimetallic strip independently drive the trip mechanism. The trip mechanism quickly disengages from the lock mechanism, resulting in a more sensitive tripping action and increased reliability. This circuit breaker operating mechanism offers the advantages of a simple structure, stable and reliable performance, easy assembly, fast opening and closing speeds, and flexible operation.

Claims

1. An operating mechanism of a 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, 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, and a moving contact that cooperates with the contact frame. The handle is connected to the lock buckle through a connecting rod, one end of the lock buckle is connected to the contact frame through a U-shaped connecting rod, the other end of the lock buckle has a locking groove that cooperates with the jump buckle, the locking groove rotates with the lock buckle and can be buckled on one end of the jump buckle to achieve locking of the lock buckle and the jump buckle, the other end of the jump buckle has a tripping part that cooperates with the electromagnetic release and the bimetallic strip, the electromagnetic release and the bimetallic strip can respectively drive the tripping part to move, and achieve unlocking of the lock buckle and the jump buckle.

2. The operating mechanism of the circuit breaker according to claim 1, 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 passing through the driving hole and extending into the sliding guide hole of the shell, and the guide rod portion of the connecting rod moves with the handle and slides back and forth in the sliding guide hole.

3. The operating mechanism of the circuit breaker according to claim 1 or 2, characterized in that: The locking groove is an arc-surface groove, and one end of the jump buckle has an arc-surface convex bearing surface that matches the locking groove.

4. The operating mechanism of the circuit breaker according to claim 1 or 2, characterized in that: One end of the lock has a connecting hole that matches the U-shaped connecting rod, the contact frame is provided with a through hole that matches the U-shaped connecting rod, and a guide groove is provided at the corresponding through hole in the shell. One end of the U-shaped connecting rod is connected to the connecting hole, and the other end of the U-shaped connecting rod passes through the through hole and extends into the guide groove. The other end of the U-shaped connecting rod moves with the lock and reciprocates in the guide groove.

5. The operating mechanism of the circuit breaker according to claim 1 or 2, characterized in that: A positioning boss is provided on the contact frame, a positioning hole matching the positioning boss is provided on the moving contact, the positioning boss is inserted into the positioning hole, a contact torsion spring is provided on the positioning boss, and a first limiting groove and a second limiting groove are respectively provided on one side of the moving contact corresponding to the positioning boss, and two ends of the contact torsion spring are respectively engaged in the first limiting groove and the second limiting groove.

6. The operating mechanism of the circuit breaker according to claim 1 or 2, characterized in that: The contact frame is provided with a positioning column matched with the spring, one end of the spring is clamped on the positioning column, and the other end of the spring is clamped in a clamping groove in the shell.

7. The operating mechanism of the circuit breaker according to claim 6, characterized in that: A positioning groove is arranged on one side of the contact frame corresponding to the positioning column, and a positioning column is arranged on the shell corresponding to the positioning groove. The positioning column is inserted into the positioning groove to form a rotational connection cooperation between the contact frame and the positioning column.

8. The operating mechanism of the circuit breaker according to claim 1 or 2, characterized in that: A positioning shaft is provided in the shell corresponding to the jump buckle, the positioning shaft is inserted into the positioning shaft hole in the middle of the jump buckle, the torsion spring is sleeved on the positioning shaft, one end of the torsion spring is in contact with the clamping groove of the jump buckle, and the other end of the torsion spring is in contact with the limiting plate of the shell.

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