Quick tripping device

Abstract

The utility model relates to a tripping device of a circuit breaker, in particular to a quick tripping device, which is assembled in the circuit breaker, and the circuit breaker comprises a static contact bridge, a movable contact bridge, a rotating shaft, an operating mechanism, a traction rod and the quick tripping device, the quick tripping device comprises a lever mechanism, a transmission mechanism and a reset tension spring; the static contact bridge is assembled in the circuit breaker; the movable contact bridge and the lever mechanism are movably connected in the rotating shaft through a mounting shaft; one end of the lever mechanism is in transmission with the movable contact bridge, and the other end is connected with the reset tension spring and the transmission mechanism; one end of the transmission mechanism is connected with the lever mechanism, and the other end of the transmission mechanism is in transmission arrangement with the draw bar; one end of the reset tension spring is connected with the lever mechanism and the other end is connected with the transmission mechanism; the rotating shaft and the draw bar are in transmission with the operating mechanism. Compared with the prior art, the utility model solves the defect that the contact of the circuit breaker is easy to fall back, and realizes the accurate and rapid unlocking of the operating mechanism of the circuit breaker after the contact is separated due to the electric repulsive force.

Description

Technical Field

[0001] The utility model relates to a tripping device of a circuit breaker, in particular to a quick tripping device. Background Art

[0002] Existing molded case circuit breakers usually have a current limiting function. When a short circuit occurs in a circuit, the moving and static contacts of the circuit breaker are repelled and an arc is generated in a very short time under the action of electro - dynamic repulsion force. As the separation distance between the moving and static contacts increases, the electro - dynamic repulsion force rapidly decreases. When the electro - dynamic repulsion force is less than the reaction force of the contact spring, the moving and static contacts begin to approach, and this kind of approach is called "fall - back of the contacts", which will have an adverse impact on the circuit breaker, such as: prolonging the breaking time, causing the re - ignition of the arc in the arc extinguishing chamber, and seriously burning out the circuit breaker, thus affecting the breaking ability of the circuit breaker.

[0003] In small - capacity circuit breakers, a general solution is to use an electromagnet to act to quickly unlock the operating mechanism of the circuit breaker. When a short circuit occurs in the circuit, the operating mechanism of the circuit breaker quickly acts to separate the moving and static contacts, thus avoiding the "fall - back of the contacts" phenomenon of the repelled contacts.

[0004] However, due to space limitations in the circuit breaker, the size of the electromagnet is restricted, and the electromagnet is extremely easy to saturate, thus affecting the action speed of the operating mechanism of the circuit breaker, resulting in the "fall - back of the contacts" phenomenon of the repelled contacts again, and ultimately causing the risk of circuit breaker failure.

[0005] Therefore, a tripping device is needed that can accurately and quickly unlock the operating mechanism of the circuit breaker after the contacts are separated due to electro - dynamic repulsion force. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a quick tripping device to solve at least one of the above problems, so as to solve the defect that the circuit breaker in the prior art is prone to cause the repelled contacts to fall back again due to space limitations, which may lead to circuit breaker failure. This solution realizes that the operating mechanism of the circuit breaker can be accurately and quickly unlocked after the contacts are separated due to electro - dynamic repulsion force.

[0007] The purpose of the utility model is realized through the following technical solutions:

[0008] A quick tripping device is assembled in a circuit breaker. The circuit breaker includes a static contact bridge, a moving contact bridge, a rotating shaft, an operating mechanism, a traction rod and a quick tripping device;

[0009] The quick tripping device includes a lever mechanism, a transmission mechanism and a return tension spring;

[0010] The static contact bridge is assembled in the circuit breaker;

[0011] The moving contact bridge is movably connected to the rotating shaft through a mounting shaft;

[0012] The lever mechanism is movably connected to the rotating shaft through a mounting shaft. One end of the lever mechanism is in transmission connection with the moving contact bridge, and the other end is connected to the return spring and the transmission mechanism;

[0013] The transmission mechanism is assembled in the rotating shaft. One end of the transmission mechanism is connected to the lever mechanism, and the other end is in transmission connection with the traction rod;

[0014] One end of the return spring is connected to the lever mechanism, and the other end is connected to the transmission mechanism;

[0015] The rotating shaft and the traction rod are in transmission connection with the operating mechanism;

[0016] When the circuit breaker is in the closed state: the static contact bridge is coupled with the moving contact bridge, and one end of the lever mechanism (under the spring force of the return spring) abuts against the moving contact bridge, and the transmission mechanism does not move;

[0017] When a short circuit occurs in the circuit: the moving contact bridge repels, and through the transmission of the quick trip device, the traction rod rotates and unlocks the operating mechanism; the operating mechanism drives the rotating shaft to rotate through transmission, so that the moving contact bridge and the static contact bridge maintain a separated state.

[0018] Preferably, the moving contact bridge includes a moving contact, an arc groove and a first mounting hole;

[0019] The moving contact is arranged at one end of the moving contact bridge, and the moving contact is coupled with the static contact at the end of the static contact bridge when the circuit breaker is closed;

[0020] The first mounting hole is arranged at the other end of the moving contact bridge for assembling the mounting shaft;

[0021] The arc groove is opened on the upper surface of the moving contact bridge for connecting the lever mechanism.

[0022] Preferably, the arc groove and the first mounting hole are concentrically arranged.

[0023] Preferably, the rotating shaft includes an assembly hole, a convex platform and a screw fastening hole;

[0024] The assembly hole is opened on the side wall of the rotating shaft for assembling the mounting shaft;

[0025] The convex platform is arranged on the upper part of the rotating shaft for limiting the transmission mechanism;

[0026] The screw fastening hole is opened on the upper part of the rotating shaft for assembling the transmission mechanism.

[0027] Preferably, the lever mechanism includes a pair of connecting shafts and a pair of lever pieces;

[0028] One end of the described lever piece is provided with a connecting hole, and the other end is provided with a slot; a second mounting hole is also provided in the middle of the lever piece for assembling the mounting shaft.

[0029] The described connecting shaft includes a first connecting shaft and a second connecting shaft; the first connecting shaft passes through the connecting hole, and the first connecting shaft is drivingly arranged with the moving contact bridge; the second connecting shaft passes through the slot, and the second connecting shaft is connected with the transmission mechanism; one end of the return tension spring is sleeved on the second connecting shaft.

[0030] Preferably, the transmission mechanism includes a first bracket, a second bracket, a push rod, a crank, a stepped shaft and a return torsion spring.

[0031] The first bracket and the second bracket are fixedly assembled in the rotating shaft by screws. The push rod is connected between the first bracket and the second bracket. The crank is connected between the first bracket and the second bracket through the stepped shaft. One end of the return torsion spring is connected to the first bracket or the second bracket, and the other end abuts against the surface of the push rod.

[0032] One end of the described crank is connected with the lever mechanism, and the other end is drivingly arranged with the push rod.

[0033] One end of the described push rod abuts against the crank, and the other end is drivingly arranged with the traction rod.

[0034] Preferably, the push rod includes a first end and a second end.

[0035] The surface of the first end facing the crank side is the driving surface, and the surface facing away from the crank side is the return surface; the return torsion spring abuts against the return surface.

[0036] The end of the second end is provided with a first actuating surface for pushing the traction rod to rotate in the first direction.

[0037] Preferably, the included angle between the first end and the second end is 120±5°.

[0038] Preferably, the crank includes a connecting rod end and a cam end.

[0039] The connecting rod end is connected with the lever mechanism.

[0040] The cam end is provided with a sector-shaped convex block. The surface of the cam end other than the sector-shaped convex block is the first limiting surface, the sector surface of the sector-shaped convex block is the second limiting surface, and the end of the sector-shaped convex block facing the outside is provided with a second actuating surface.

[0041] When the circuit breaker is in the closed state, the first limiting surface abuts against the push rod; when a short circuit occurs in the circuit, the lever mechanism drives the crank to rotate through transmission, so that the sector-shaped convex block drives the push rod to rotate through transmission; when the crank rotates further, the second limiting surface abuts against the push rod.

[0042] Preferably, the first bracket includes a first assembly hole, a second assembly hole, a third assembly hole, and a bending portion; the first assembly hole is for passing through a screw, the second assembly hole is for assembling a push rod, the third assembly hole is for assembling a crank, and the bending portion is for connecting a return spring.

[0043] The second bracket includes a fourth assembly hole, a fifth assembly hole, a sixth assembly hole, and a seventh assembly hole; the fourth assembly hole is for passing through a screw, the fifth assembly hole is for assembling a push rod, the sixth assembly hole is for assembling a crank, and the seventh assembly hole is for connecting a return torsion spring.

[0044] Compared with the prior art, the present utility model has the following beneficial effects:

[0045] (1) In this technical solution, the breaking mode of using the moving contact itself to drive the tripping device is adopted in the structure. Compared with the breaking mode of using an electromagnet to drive the tripping device in the prior art, the response speed is faster, which can effectively prevent the falling back of the moving contact and improve the breaking reliability of the circuit breaker.

[0046] (2) This technical solution adopts a special lever mechanism, so that when any moving contact repels, it will drive the operating mechanism to trip, avoiding the phenomenon of "falling back of the contact" of the repelled contact again. In the prior art, only when a designated moving contact in each phase bounces, the operating mechanism will be driven to trip. The improvement of the prior art improves the breaking reliability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a schematic structural diagram of the quick tripping device;

[0048] Figure 2 It is a schematic structural diagram of the moving contact bridge and the static contact bridge in the quick tripping device in a coupled state;

[0049] Figure 3 It is a schematic structural diagram of the moving contact bridge and the static contact bridge in the quick tripping device in a separated state;

[0050] Figure 4 It is an exploded schematic structural diagram of the lever mechanism;

[0051] Figure 5 It is an exploded schematic structural diagram of the transmission mechanism;

[0052] Figure 6 It is a schematic structural diagram of the moving contact bridge;

[0053] Figure 7 It is a schematic structural diagram of the rotating shaft;

[0054] Figure 8It is a schematic structural diagram of a push rod;

[0055] Figure 9 It is a schematic structural diagram of a crank;

[0056] Figure 10 It is a schematic diagram of the movement process of the push rod and the crank during the disconnection process of the quick release device;

[0057] In the figure: 1 - static contact bridge; 2 - moving contact bridge; 3 - rotating shaft; 4 - operating mechanism; 5 - traction rod; 6 - lever mechanism; 7 - transmission mechanism; 8 - return spring; 9 - screw; 11 - static contact; 21 - moving contact; 22 - arc groove; 23 - first mounting hole; 31 - mounting shaft; 32 - assembly hole; 33 - boss; 34 - screw fastening hole; 61 - connecting shaft; 62 - lever piece; 621 - connecting hole; 622 - second mounting hole; 623 - slotted hole; 71 - first bracket; 711 - first assembly hole; 712 - second assembly hole; 713 - third assembly hole; 714 - bending part; 72 - second bracket; 721 - fourth assembly hole; 722 - fifth assembly hole; 723 - sixth assembly hole; 724 - seventh assembly hole; 73 - push rod; 731 - first end; 7311 - driving surface; 7312 - reset surface; 732 - second end; 7321 - first actuating surface; 733 - first boss; 734 - second boss; 74 - crank; 741 - connecting rod end; 7411 - first connecting hole; 7412 - second connecting hole; 742 - cam end; 7421 - first limiting surface; 7422 - second actuating surface; 7423 - second limiting surface; 75 - stepped shaft; 76 - return torsion spring. Specific embodiments

[0058] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0059] Embodiment 1

[0060] A quick release device, as Figure 1-10 shown, is assembled in a circuit breaker. The circuit breaker includes a static contact bridge 1, a moving contact bridge 2, a rotating shaft 3, an operating mechanism 4, a traction rod 5 and a quick release device;

[0061] The quick release device includes a lever mechanism 6, a transmission mechanism 7 and a return spring 8;

[0062] The static contact bridge 1 is assembled in the circuit breaker;

[0063] The moving contact bridge 2 is movably connected to the rotating shaft 3 through a mounting shaft 31;

[0064] The lever mechanism 6 is movably connected to the rotating shaft 3 through a mounting shaft 31. One end of the lever mechanism 6 is arranged in transmission with the moving contact bridge 2, and the other end is connected to the return spring 8 and the transmission mechanism 7;

[0065] The described transmission mechanism 7 is assembled inside the rotating shaft 3. One end of the transmission mechanism 7 is connected to the lever mechanism 6, and the other end is drivingly arranged with the traction rod 5.

[0066] One end of the described return spring 8 is connected to the lever mechanism 6, and the other end is connected to the transmission mechanism 7.

[0067] The rotating shaft 3 and the traction rod 5 are drivingly arranged with the operating mechanism 4.

[0068] When the circuit breaker is in the closed state: the static contact bridge 1 is coupled with the moving contact bridge 2. One end of the lever mechanism 6 abuts against the moving contact bridge 2 under the spring force of the return spring 8, and the transmission mechanism 7 does not move.

[0069] When a short circuit occurs in the circuit: the moving contact bridge 2 repels and rotates the traction rod 5 through the transmission of the quick release device to unlock the operating mechanism 4; the operating mechanism 4 drives the rotating shaft 3 to rotate through transmission, so that the moving contact bridge 2 and the static contact bridge 1 maintain a separated state.

[0070] More specifically, in this embodiment:

[0071] The main structure of the circuit breaker is composed of a static contact bridge 1, a moving contact bridge 2, a rotating shaft 3, an operating mechanism 4, a traction rod 5 and a quick release device. The system structure of the quick release device:

[0072] It is composed of a lever mechanism 6, a transmission mechanism 7 and a return spring 8. Through mechanical transmission, the rotation of the moving contact bridge 2 is transmitted to the rotation of the traction rod 5, and then the operating mechanism 4 of the circuit breaker is unlocked to achieve and maintain the separated state between the moving contact bridge 2 and the static contact bridge 1, so that the circuit breaker trips.

[0073] The static contact bridge 1 is assembled inside the housing of the circuit breaker, and a static contact point 11 is provided at one end of it.

[0074] The moving contact bridge 2, such as Figure 6 , has a moving contact point 21 at one end that can be coupled or disconnected from the static contact point 11. A first mounting hole 23 is provided at the other end of the moving contact bridge 2. An arc groove 22 is provided at a position near the middle on the side of the first mounting hole 23 of the moving contact bridge 2. The arc groove 22 is provided on the upper surface of the moving contact bridge 2 and is concentric with the mounting hole. A hook claw block also protrudes below the moving contact bridge 2 corresponding to the arc groove 22. The moving contact bridge 2 is movably assembled on the rotating shaft 3 through a mounting shaft 31 passing through the first mounting hole 23.

[0075] The rotating shaft 3, such as Figure 7, it forms an open cavity for accommodating the moving contact bridge 2, and assembly holes 32 are symmetrically opened on both side walls of the open cavity for assembling the mounting shaft 31. Above the open cavity, a slot for assembling the transmission mechanism 7 is formed. A boss 33 (for limiting the transmission mechanism 7) extends inward from the side of the slot, and screw fastening holes 34 (for fixing and assembling the transmission mechanism 7) are opened on the inner side wall surface of the slot.

[0076] The lever mechanism 6, such as Figure 4 , is composed of two connecting shafts 61 and two lever pieces 62, forming a quadrilateral structure. One end of the lever piece 62 is provided with a connecting hole 621, the middle of the lever piece 62 is provided with a second mounting hole 622, and the other end of the lever piece 62 is provided with a slotted hole 623. Among the two connecting shafts 61 (divided into the first connecting shaft 61 and the second connecting shaft 61), the first connecting shaft 61 passes through the connecting holes 621 of the two lever pieces 62 and is slidably arranged in the arc groove 22 of the moving contact bridge 2, and the second connecting shaft 61 passes through the slotted holes 623 of the two lever pieces 62 and is connected to the transmission mechanism 7. The lever mechanism 6 is also movably assembled on the rotating shaft 3 through the mounting shaft 31 passing through the second mounting hole 622. Moreover, one end of the return spring 8 is hooked on the second connecting shaft 61. In addition, to match the internal structure configuration of the circuit breaker, the two ends of the lever piece 62 where the connecting hole 621 and the slotted hole 623 are provided form an obtuse angle, and the second mounting hole 622 is located at the corner.

[0077] The transmission mechanism 7, such as Figure 5 , 8 , 9, is composed of a first bracket 71, a second bracket 72, a push rod 73, a crank 74, a stepped shaft 75 and a return torsion spring 76. The first bracket 71 is a 90° bent plate, and a first assembly hole 711 is opened on its rear side for fixing and assembling the first bracket 71 on the rotating shaft 3 in cooperation with the screw 9 and the screw fastening hole 34. A second assembly hole 712 and a third assembly hole 713 are respectively opened on its right side. The second assembly hole 712 is used for installing the push rod 73, and the third assembly hole 713 is used for installing the crank 74. A bent portion 714 with a 180° bend is also connected to the rear side of the first bracket 71, which is used for hooking one end of the return spring 8. The second bracket 72 is a 90° bent plate, and a fourth assembly hole 721 is opened on its rear side for fixing and assembling the second bracket 72 on the rotating shaft 3 in cooperation with the screw 9 and the screw fastening hole 34. A fifth assembly hole 722, a sixth assembly hole 723 and a seventh assembly hole 724 are respectively opened on its left side. The fifth assembly hole 722 is used for installing the push rod 73, the sixth assembly hole 723 is used for installing the crank 74, and the seventh assembly hole 724 is used for installing the return torsion spring 76. Such as Figure 8As shown, the push rod 73 is provided with a first end 731, a second end 732, a first boss 733 and a second boss 734. Among them, the included angle between the first end 731 and the second end 732 is approximately 120°. The first boss 733 and the second boss 734 are arranged on both sides of this corner. The side of the first end 731 facing the crank 74 is the driving surface 7311, and the side facing away from the crank 74 is the reset surface 7312. One end of the reset torsion spring 76 is installed in the seventh assembly hole 724, and the other end abuts against the reset surface 7312. The second end 732 is provided with a first actuating surface 7321 at the end position for pushing the traction rod 5 to rotate. The crank 74, as Figure 9 shown, includes a connecting rod end 741 and a cam end 742 integrally connected (the cam end 742 is connected to the side of the connecting rod end 741 and protrudes from the connecting rod end 741). The first connecting hole 7411 and the second connecting hole 7412 are respectively arranged at both ends of the connecting rod end 741. The cam end 742 is located at the second connecting hole 7412 and protrudes outward with a sector-shaped protrusion. The cam end 742 includes a first limiting surface 7421 (the surface outside the sector-shaped protrusion), a second actuating surface 7422 (the end of the sector-shaped protrusion facing the outside) and a second limiting surface 7423 (the surface of the sector-shaped protrusion). During the operation of the quick-release device, these three surfaces alternately abut / push the push rod 73 to rotate in turn. The push rod 73 and the crank 74 are respectively movably installed between the first bracket 71 and the second bracket 72. Specifically, the first boss 733 of the push rod 73 is aligned and inserted into the second assembly hole 712, and the second boss 734 passes through the reset torsion spring 76 and is aligned and inserted into the fifth assembly hole 722; one end of the reset torsion spring 76 is aligned and inserted into the seventh assembly hole 724, and the other end closely adheres to the reset surface 7312 of the push rod 73; the stepped shaft 75 passes through the first connecting hole 7411 of the crank 74, and the third assembly hole 713 and the sixth assembly hole 723 are aligned and inserted, and the stepped surfaces on both sides of the stepped shaft 75 closely adhere to the side surfaces of the first bracket 71 and the second bracket 72. The second connecting hole 7412 of the crank 74 is used to connect and assemble the second connecting shaft 61. Further, driven by the lever mechanism 6, the transmission mechanism 7 (the crank 74 and the push rod 73 therein) will perform a rotational motion.

[0078] The traction rod 5 and the rotating shaft 3 are respectively arranged in a transmission manner with the operating mechanism 4, and thus the three can drive each other to move.

[0079] The assembly of this quick-release device, as Figure 1-3 shown:

[0080] The moving contact bridge 2 and the lever mechanism 6 are jointly hinged on the rotating shaft 3 through the mounting shaft 31. The connecting shaft 61 (the first connecting shaft 61) placed in the connecting hole 621 is installed in the arc groove 22 of the moving contact bridge 2. The second connecting shaft 61 of the connecting shaft 61 placed in the slot hole 623 passes through the hook ring on one side of the return spring 8 and the second connecting hole 7412 of the crank 74, connecting the lever mechanism 6 and the transmission mechanism 7. The boss 33 formed in the rotating shaft 3 positions the first bracket 71 and the second bracket 72 in the transmission mechanism 7, so that the first assembly hole 711 and the fourth assembly hole 721 can be respectively aligned with the corresponding screw fastening holes 34, and then tightened and fixed with screws 9. The other hook ring of the return spring 8 is hooked on the bent portion 714 of the first bracket 71.

[0081] As Figure 10 shown, four positions (P1 - P4) of the crank 74 during movement and two positions (S1, S2) of the push rod 73 during movement are respectively shown: the first position (P1) of the crank 74 is represented by a solid line in Figure 10 ; the second position (P2) of the crank 74 is represented by a dashed line in Figure 10 ; the third position (P3) of the crank 74 is represented by a dotted - dash line in Figure 10 ; the fourth position (P4) of the crank 74 is represented by a dotted line in Figure 10 ; the first position (S1) of the push rod 73 is represented by a solid line in Figure 10 ; the second position (S2) of the push rod 73 is represented by a dashed line in Figure 10 .

[0082] For a circuit breaker, usually there are multiple moving contact bridges 2 in each phase. In the quick - release device of this solution, the first connecting shaft 61 in the lever mechanism 6 of each phase forms a connection relationship with the arc grooves 22 of each moving contact bridge 2 in this phase, that is, the first connecting shaft 61 of each phase is slidably arranged in the arc grooves 22 of each moving contact bridge 2 in this phase. Thus, when any one of the moving contact bridges 2 bounces due to electric repulsive force, the quick - release device can operate quickly and correctly to disconnect the contact between the moving contact bridge 2 and the static contact bridge 1, ensuring the safe operation of the circuit. In addition, as Figure 1 shown, the lower hook claw block of the moving contact bridge 2 is also connected to the plate below the rear side of the rotating shaft 3 through a contact spring to provide contact pressure.

[0083] The functions and working principles of the main components in this quick - release device are as Figure 2 , 3 , 10:

[0084] When the moving contact point 21 of any moving contact bridge 2 is separated from the static contact point 11 on the static contact bridge 1 due to the electro-dynamic repulsive force, the moving contact bridge 2 will rotate clockwise around the mounting shaft 31. During this rotation process, it will further drive the connecting shaft 61 (the first connecting shaft 61) placed in its arc groove 22 to rotate, thereby causing the lever mechanism 6 to also rotate clockwise around the mounting shaft 31. Further still, the connecting shaft 61 (the second connecting shaft 61) placed in the elongated hole 623 will drive the crank 74 to rotate counterclockwise around the stepped shaft 75. When the moving contact bridge is not repelled, under the action of the return torsion spring 76, the driving surface 7311 of the push rod 73 closely adheres to the first limiting surface 7421 of the crank 74. At this time, the crank 74 is in the first position (P1), and the push rod 73 is in the first position (S1). When the crank 74 rotates by α°, the second actuating surface 7422 of the cam end 742 abuts against the driving surface 7311 of the push rod 73. At this time, the crank 74 is in the second position (P2), and the push rod 73 is still in the first position (S1), that is, the push rod 73 does not move. When the crank 74 continues to rotate by β° (i.e., a total rotation of α to α + β°), the second actuating surface 7422 of the cam end 742 abuts against the driving surface 7311 of the push rod 73 and causes the push rod 73 to start rotating counterclockwise. At this time, the crank 74 is in the third position (P3), and the push rod 73 rotates to the second position (S2), and the push rod 73 acts to trigger the protection. When the crank 74 continues to rotate by γ°, the driving surface 7311 of the push rod 73 closely adheres to the second limiting surface 7423 of the cam end 742. At this time, the crank 74 is in the fourth position (P4), and the push rod 73 is still in the second position (S2), and the push rod 73 is limited in the S2 state and cannot continue to rotate.

[0085] During the process of the push rod 73 rotating from the first position (S1) to the second position (S2), the first end 731 of the push rod 73 is pushed by the cam end 742, causing the push rod 73 to start rotating counterclockwise. The first actuating surface 7321 of its second end 732 closely adheres to the traction rod 5, thereby causing the traction rod 5 to rotate, further promoting the unlocking of the operating mechanism 4, and further driving the rotating shaft 3 to rotate so that the moving contact bridge 2 and the static contact bridge 1 remain in a separated state. When the rotating shaft 3 rotates, under the combined action of the return tension spring 8 and the return torsion spring 76, the lever mechanism 6 and the driving mechanism will return to the initial position. At this time, the moving contact bridge 2 and the static contact bridge 1 maintain the separated state.

[0086] The above description of the embodiments is for the convenience of those of ordinary skill in the art to understand and use the utility model. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative labor. Therefore, the present utility model is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the present utility model according to the disclosure of the present utility model should be within the protection scope of the present utility model.

Claims

1. A quick release device, assembled in a circuit breaker, characterized in that: The circuit breaker comprises a stationary contact bridge (1), a movable contact bridge (2), a rotating shaft (3), an operating mechanism (4), a traction rod (5) and a quick release device; The quick release device comprises a lever mechanism (6), a transmission mechanism (7) and a reset tension spring (8); The static contact bridge (1) is installed in the circuit breaker; The movable contact bridge (2) is movably connected to the rotating shaft (3) via a mounting shaft (31); The lever mechanism (6) is movably connected to the rotating shaft (3) via a mounting shaft (31); one end of the lever mechanism (6) is transmission-connected to the moving contact bridge (2), and the other end is connected to a reset tension spring (8) and a transmission mechanism (7); The transmission mechanism (7) is assembled in the rotating shaft (3), one end of the transmission mechanism (7) is connected to the lever mechanism (6), and the other end is arranged for transmission with the traction rod (5); One end of the return tension spring (8) is connected to the lever mechanism (6), and the other end is connected to the transmission mechanism (7); The rotating shaft (3) and the traction rod (5) are arranged in a transmission manner with the operating mechanism (4); When the circuit breaker is in a closed state: the stationary contact bridge (1) is coupled with the moving contact bridge (2), one end of the lever mechanism (6) abuts against the moving contact bridge (2), and the transmission mechanism (7) does not move; When a short circuit occurs in the circuit, the moving contact bridge (2) is pushed away, and the traction rod (5) is rotated through the transmission of the quick release device, thereby unlocking the operating mechanism (4); the operating mechanism (4) drives the rotating shaft (3) to rotate through the transmission, so that the moving contact bridge (2) and the stationary contact bridge (1) are maintained in a separated state.

2. A quick release device according to claim 1, characterized in that: The moving contact bridge (2) comprises a moving contact point (21), an arc groove (22) and a first mounting hole (23); The moving contact (21) is arranged at one end of the moving contact bridge (2), and the moving contact (21) is coupled with the static contact (11) at the end of the static contact bridge (1) when the circuit breaker is closed; The first mounting hole (23) is arranged at the other end of the moving contact bridge (2) and is used for assembling the mounting shaft (31); The arc groove (22) is provided on the upper surface of the moving contact bridge (2) and is used for connecting the lever mechanism (6).

3. A quick release device according to claim 2, characterized in that: The arc groove (22) and the first mounting hole (23) are arranged concentrically.

4. A quick release device according to claim 1, characterized in that: The rotating shaft (3) comprises an assembly hole (32), a boss (33) and a screw fastening hole (34); The assembly hole (32) is formed on the side wall of the rotating shaft (3) and is used for assembling the installation shaft (31); The boss (33) is arranged on the upper part of the rotating shaft (3) and is used for limiting the transmission mechanism (7); The screw fastening hole (34) is provided on the upper part of the rotating shaft (3) and is used for assembling the transmission mechanism (7).

5. A quick release device according to claim 1, characterized in that: The lever mechanism (6) comprises a pair of connecting shafts (61) and a pair of lever plates (62); The lever piece (62) has a connecting hole (621) at one end and a strip hole (623) at the other end; a second mounting hole (622) is also formed in the middle of the lever piece (62) for assembling the mounting shaft (31); The connecting shaft (61) comprises a first connecting shaft and a second connecting shaft; the first connecting shaft is arranged through the connecting hole (621), and the first connecting shaft is arranged for transmission with the moving contact bridge (2); the second connecting shaft is arranged through the bar hole (623), and the second connecting shaft is connected to the transmission mechanism (7); one end of the reset tension spring (8) is sleeved on the second connecting shaft.

6. A quick release device according to claim 1, characterized in that: The transmission mechanism (7) comprises a first bracket (71), a second bracket (72), a push rod (73), a crank (74), a stepped shaft (75) and a return torsion spring (76); The first bracket (71) and the second bracket (72) are fixedly assembled in the rotating shaft (3) by means of screws (9); the push rod (73) is connected between the first bracket (71) and the second bracket (72); the crank (74) is connected between the first bracket (71) and the second bracket (72) by means of a stepped shaft (75); one end of the return torsion spring (76) is connected to the first bracket (71) or the second bracket (72), and the other end abuts against the surface of the push rod (73); One end of the crank (74) is connected to the lever mechanism (6), and the other end is in transmission arrangement with the push rod (73); One end of the push rod (73) is in contact with the crank (74), and the other end is in transmission arrangement with the traction rod (5).

7. A quick release device according to claim 6, characterized in that: The push rod (73) comprises a first end (731) and a second end (732); The surface of the first end (731) facing the crank (74) is a driving surface (7311), and the surface of the first end (731) facing away from the crank (74) is a reset surface (7312); the reset torsion spring (76) abuts against the reset surface (7312); The end of the second end (732) is provided with a first actuating surface (7321) for pushing the traction rod (5) to rotate in a first direction.

8. A quick release device according to claim 7, characterized in that: The angle between the first end (731) and the second end (732) is 120±5°.

9. A quick release device according to claim 6, characterized in that: The crank (74) comprises a connecting rod end (741) and a cam end (742); The connecting rod end (741) is connected to the lever mechanism (6); The cam end (742) is provided with a fan-shaped protrusion, the surface of the cam end (742) other than the fan-shaped protrusion is a first limiting surface (7421), the fan-shaped surface of the fan-shaped protrusion is a second limiting surface (7423), and the end of the fan-shaped protrusion facing outward is provided with a second actuating surface (7422); When the circuit breaker is in a closed state, the first limit surface (7421) abuts against the push rod (73); when a short circuit occurs in the circuit, the lever mechanism (6) causes the crank (74) to rotate through transmission, and the fan-shaped protrusion causes the push rod (73) to rotate through transmission; the crank (74) further rotates, causing the second limit surface (7423) to abut against the push rod (73).

10. A quick release device according to claim 6, characterized in that: The first bracket (71) comprises a first assembly hole (711), a second assembly hole (712), a third assembly hole (713) and a bend (714); the first assembly hole (711) is used to pass a screw (9), the second assembly hole (712) is used to assemble a push rod (73), the third assembly hole (713) is used to assemble a crank (74), and the bend (714) is used to connect a reset tension spring (8); The second bracket (72) comprises a fourth assembly hole (721), a fifth assembly hole (722), a sixth assembly hole (723) and a seventh assembly hole (724); the fourth assembly hole (721) is used to pass the screw (9), the fifth assembly hole (722) is used to assemble the push rod (73), the sixth assembly hole (723) is used to assemble the crank (74), and the seventh assembly hole (724) is used to connect the reset torsion spring (76).

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