A moving contact mechanism of a circuit breaker
By designing a moving contact mechanism with structures including sliding grooves, bent parts, straight parts, bosses, positioning blocks, arcuate convex columns, convex ribs, torsion springs and positioning plates, the unreasonable structure of the existing circuit breaker dynamic contact mechanism is solved and the problems of lag, lag, and adhesion are prone to lag, lag, and adhesion, and the structural rationality and working stability of the circuit breaker are achieved.
Patent Information
- Application Number
- CN202011568391.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-12-25
- Publication Date
- 2025-06-20
- Estimated Expiration
- 2040-12-25
AI Technical Summary
The structure of the moving contact mechanism of the existing circuit breakers is unreasonable and is prone to lag. The N-pole moving contacts and L-pole moving contacts are unreasonable, and they are prone to lag when tripping, and there is a problem of adhesion or friction between the lock and the mounting seat.
A moving contact mechanism including a movable contact mounting seat, a lock, an L-pole movable contact and an N-pole movable contact is designed. Through structures such as slide grooves, bent parts, straight parts, bosses, positioning blocks, arcuate convex columns, convex ribs, torsion springs and positioning plates, the rational installation and rotation of the moving contacts is achieved, avoiding the problems of adhesion and increased friction.
The structural rationality and working stability of the moving contact mechanism of the circuit breaker are realized, and the phenomenon of lag and hysteresis is avoided, the problems of adhesion and friction are reduced, and the operation reliability and safety of the circuit breaker are improved.
Smart Images
Figure CN112490090B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a circuit breaker, in particular to a moving contact mechanism of the circuit breaker inside the circuit breaker. Background Art
[0002] The structure of the moving contact mechanism of the existing circuit breaker is unreasonable, and jamming is likely to occur. In addition, the installation of the N-pole moving contact and the L-pole moving contact is unreasonable, and problems such as easy lag during tripping are likely to occur. Finally, problems such as adhesion or increased friction are likely to occur between the lock and the mounting seat. Summary of the Invention
[0003] The present invention overcomes the problems existing in the prior art and provides a new moving contact mechanism of a circuit breaker with a reasonable structure and stable operation.
[0004] To achieve the above object, the present invention adopts the following technical solution: A moving contact mechanism of a circuit breaker includes a moving contact mounting seat, a lock, an L-pole moving contact, and an N-pole moving contact. Mounting posts are provided on both sides of the moving contact mounting seat and on the same axis. The L-pole moving contact and the N-pole moving contact are respectively movably arranged on the mounting posts on both sides of the moving contact mounting seat. The side of the moving contact mounting seat where the L-pole moving contact is installed is the first side, and the side where the N-pole moving contact is installed is the second side. It is characterized in that: A chute is provided above the first side of the moving contact mounting seat. The chute has a bent portion and a straight portion. A contact arm is provided on the lock, and the contact arm is matched with the chute to lock or release the handle link of the circuit breaker. A boss is provided below the chute, and a positioning block is provided below the boss. An arc-shaped convex column is provided around the bottom of the mounting post on the first side of the moving contact mounting seat. A convex rib is provided on the plane around the mounting post on the first side of the moving contact mounting seat. An installation through hole is provided on the lock, and the installation through hole of the lock is sleeved on the mounting post on the first side and forms a rotational fit with the arc-shaped convex column. The L-pole moving contact is sleeved on the mounting post on the first side and its side abuts or is close to the end of the arc-shaped convex column. A first bayonet is provided on the L-pole moving contact. A concave cavity is provided on the moving contact mounting seat corresponding to the first bayonet. A stop block is provided below the boss, and a limiting groove is formed between the stop block and the side surface of the first side of the moving contact mounting seat. A first torsion spring is provided between the L-pole moving contact and the moving contact mounting seat, and the first torsion spring is also sleeved on the mounting post on the first side. The first torsion arm of the first torsion spring abuts in the limiting groove below the boss, and the second torsion arm of the first torsion spring abuts on the first bayonet of the L-pole moving contact. The end wall of the second torsion arm of the first torsion spring has a bent portion, and the bent portion is inserted into the concave cavity below the first bayonet. A positioning piece is provided on the L-pole moving contact, and the positioning piece is located between the positioning block and the boss of the moving contact mounting seat. The abutment between the positioning piece and the positioning block or the boss constitutes the limit of the rotation angle of the L-pole moving contact.
[0005] By adopting the above scheme, the chute is arranged to be connected with the handle link in the circuit breaker. The chute is provided with a bent portion and a straight portion, so that it can cooperate with the abutting arm of the latch to position one end of the handle link, enabling it to be placed in the bent portion or slide into the straight portion. When one end of the handle link is placed in the bent portion, operating the circuit breaker handle, at this time the handle link can drive the moving contact seat to rotate. Specifically, the end of the handle link is always placed in the bent portion under the action of the abutting arm, realizing the closing of the circuit breaker by operating the handle. When the latch moves under an external force, the abutting arm of the latch leaves above the bent portion of the chute, that is, it loses the abutment against the handle link, then the handle link slides into the straight portion under the action of the side wall of the bent portion of the chute and the handle, and the moving contact mounting seat rotates to trip the circuit breaker; the latch rotates and cooperates with the arc-shaped convex column, and there will be a gap, and dust will enter the gap, and there will be no problem of adhesion and increased friction caused by dust jamming. The convex rib is provided to reduce friction; the L-pole moving contact is very convenient to install in the above manner. In addition, the two arms of the first torsion spring are firmly fixed on the mounting seat, and can well limit the rotation range of the L-pole moving contact. At the same time, the L-pole moving contact is closer to the static contact when closing, and will rotate first under the condition of large current, which is beneficial to quick opening.
[0006] A further setting of the present invention is: above the mounting post on the second side of the moving contact mounting seat, there is a connecting post. A convex edge is arranged around the connecting post for one week. The convex edge is respectively provided with an abutting surface and an abutting boss. A third torsion spring is sleeved on the connecting post. The first torsion arm of the third torsion spring abuts on the abutting surface, and the second torsion arm of the third torsion spring can abut on the abutting boss. Below the abutting boss, there is a second stop block. A positioning notch is formed between the second stop block and the side surface of the second side of the moving contact mounting seat. A second bayonet is arranged on the N-pole moving contact. A second concave cavity is arranged on the second side of the moving contact mounting seat and corresponding to the second bayonet. The N-pole moving contact is sleeved on the mounting post on the second side of the moving contact mounting seat, and a second torsion spring is arranged between the N-pole moving contact and the moving contact mounting seat. The second torsion spring is also sleeved on the mounting post on the second side of the moving contact mounting seat. The first torsion arm of the second torsion spring abuts on the positioning notch, and the second torsion arm of the second torsion spring abuts on the second bayonet of the N-pole moving contact. And the end of the second torsion arm of the second torsion spring is bent and inserted into the second concave cavity. A positioning convex block is arranged on the second side of the moving contact mounting seat. An N-pole limit block is arranged on the N-pole moving contact and between the positioning convex block and the abutting boss. The abutment between the N-pole limit block and the positioning convex block or the abutting boss constitutes the limit of the rotation angle of the N-pole moving contact.
[0007] By adopting the above scheme, the function of the N-pole moving contact is the same as that of the L-pole moving contact. In addition, the connecting column is arranged in the above manner, and a convex edge is arranged around it to protect the connecting column well. Even if the connecting column is broken, it does not affect the function of the third torsion spring. The interference boss arrangement on the convex edge can make the second interference arm of the third torsion spring temporarily interfere with the interference boss. When the circuit breaker base is installed, the bevel on the base can be inserted into the convex block on the base, so that mechanized installation can be realized.
[0008] A further arrangement of the present invention is that: the first torsion arm of the first torsion spring is placed near the stop block of the limiting groove, the width of the space of the limiting groove in the first torsion arm of the first torsion spring is greater than the thickness of the L-pole moving contact, and the L-pole moving contact rotates its positioning piece side to be inserted into the space of the limiting groove in the first torsion arm, and the first torsion arm of the second torsion spring is placed near the stop block of the positioning recess, the width of the space of the positioning recess in the first torsion arm of the second torsion spring is greater than the thickness of the N-pole moving contact, and the N-pole moving contact rotates its limiting block side to be inserted into the space of the positioning recess in the first torsion arm of the second torsion spring.
[0009] By adopting the above scheme, in which the limiting groove and the first torsion arm of the first torsion spring are arranged using the above scheme, it can be ensured that the range of movement of the positioning plate is not affected. In addition, the rotation of the positioning plate will not affect the torsion spring, and the two do not interfere with each other. Similarly, the positioning recess, the second torsion spring and the limiting block also have the same function.
[0010] A further configuration of the present invention is that a convex rib or a groove is provided on the circumferential surface of the moving contact mounting seat and between the positioning piece of the L-pole moving contact and the N-limit block, a convex piece is provided below the lock catch, an arc-shaped contact surface is provided on the lock catch at a position corresponding to the top rod of the circuit breaker releaser, and a contact inclined surface is provided on the lock catch and above the mounting column.
[0011] By adopting the above scheme, convex ribs or grooves are arranged on the peripheral surface of the moving contact mounting seat, the purpose of which is to increase the creepage distance. Since the positioning piece and the limit block are relatively close at this position, it is not easy to burn the product; the convex piece is arranged for the double metal pull rod to pull, the arc-shaped contact surface is arranged to facilitate the releaser top rod to push it, and the contact inclined surface is to facilitate the lock top rod to push the lock.
[0012] The final setting of the invention is: a groove is arranged around the bottom of the slide slot, the upper side of the boss and the lower side of the curved portion of the slide slot are integrally arranged to form a pressure surface, after the circuit breaker is closed, the connecting end of the circuit breaker handle connecting rod abuts against the pressure surface, and the angle between the thrust direction of the circuit breaker handle on the connecting end of the handle connecting rod and the thrust direction of the pressure surface on the connecting end of the handle connecting rod is less than 180 degrees, and the moving contact mounting seat is provided with an opening and closing indicator plate above the slide slot.
[0013] By adopting the above solution, the safety of the product is increased. The setting of the groove allows dust and the like to enter without affecting the movement of the handle connecting rod. The above limitation on the pressing surface should not only satisfy the stable pressing of the pressing surface on the handle connecting rod during closing, but also ensure that when the locking buckle rotates away from the handle connecting rod, the end of the connecting rod can slide into the straight part of the chute to achieve the disconnection of the circuit breaker. It should be noted here that the included angle between the thrust direction of the handle on the connecting end of the handle connecting rod and the thrust direction of the pressing surface on the connecting end of the handle connecting rod is less than 180 degrees. In this way, the resultant force generated by the two forces is upward. If the upper part of the end of the handle connecting rod is blocked by the contact arm of the locking buckle, the end of the handle connecting rod will stay in the bent part of the chute without moving. If the contact arm of the locking buckle above the end of the handle connecting rod leaves, the end of the handle connecting rod will slide into the straight part of the chute under the action of the upward force to achieve opening.
[0014] The following further describes the present invention with reference to specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a perspective view showing the locking buckle according to an embodiment of the present invention;
[0016] Figure 2 It is a perspective view showing the third torsion spring according to an embodiment of the present invention;
[0017] Figure 3 It is a perspective view of the moving contact mounting seat according to an embodiment of the present invention;
[0018] Figure 4 It is a perspective view showing the connecting column of the moving contact mounting seat according to an embodiment of the present invention;
[0019] Figure 5 It is a perspective view of the cooperation between the locking buckle and the moving contact mounting seat according to an embodiment of the present invention;
[0020] Figure 6 It is a structural diagram showing the force generated between the handle connecting rod and the chute contact surface during closing of the circuit breaker according to an embodiment of the present invention;
[0021] Figure 7 For Figure 6 schematic diagram of the force direction. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0022] Such as Figures 1-7As shown in the figure, a moving contact mechanism of a circuit breaker includes a moving contact mounting base 1, a latch 2, an L-pole moving contact 3 and an N-pole moving contact 4. Mounting posts 14 are provided on both sides of the moving contact mounting base 1 and are located on the same axis. The L-pole moving contact 3 and the N-pole moving contact 4 are respectively movably arranged on the mounting posts 14 on both sides of the moving contact mounting base 1. Here, the mounting posts 14 and the moving contact mounting base 1 are integrally provided. The side of the moving contact mounting base 1 where the L-pole moving contact 3 is installed is the first side 11, and the side where the N-pole moving contact 4 is installed is the second side 12. In the embodiment of the present invention, a chute 111 is provided above the first side 11 of the moving contact mounting base 1. The chute 111 has a bent portion 1111 and a straight portion 1112. A contact arm 22 is provided on the latch 2. The contact arm 22 is matched with the chute 111 to lock or release the handle link of the circuit breaker. The handle link exists in existing circuit breakers and connects the handle and the moving contact mounting base 1. We will not describe it in detail here. A boss 112 is provided below the chute 111, and a positioning block 113 is provided below the boss 112. An arc-shaped convex column 114 is provided around the bottom of the mounting post 14 on the first side 11 of the moving contact mounting base 1. A rib 115 is provided on the plane around the mounting post 14 on the first side 11 of the moving contact mounting base 1. A mounting through hole 21 is provided on the latch 2. The mounting through hole 21 of the latch 2 is sleeved on the mounting post 14 on the first side 11 and forms a rotational fit with the arc-shaped convex column 114. The L-pole moving contact 3 is sleeved on the mounting post 14 on the first side 11 and its side abuts against or is close to the end of the arc-shaped convex column 114. A first bayonet 31 is provided on the L-pole moving contact 3. A concave cavity 15 is provided on the moving contact mounting base 1 corresponding to the first bayonet 31. A stop block 1121 is provided below the boss 112. A limiting groove 1122 is formed between the stop block 1121 and the side surface of the first side 11 of the moving contact mounting base 1. A first torsion spring 5 is provided between the L-pole moving contact 3 and the moving contact mounting base 1. The first torsion spring 5 is also sleeved on the mounting post 14 on the first side 11. The first torsion arm of the first torsion spring 5 abuts in the limiting groove 1122 below the boss 112. The second torsion arm of the first torsion spring 5 abuts on the first bayonet 31 of the L-pole moving contact 3. The end of the second torsion arm of the first torsion spring 5 has a bent portion, and this bent portion is inserted into the concave cavity 15 below the first bayonet 31. In this way, the installation of the first torsion spring 5 is very firm. A positioning piece 32 is provided on the L-pole moving contact 3. The positioning piece 32 is located between the positioning block 113 and the boss 112 of the moving contact mounting base 1. The abutment between the positioning piece 32 and the positioning block 113 or the boss 112 constitutes the limit of the rotation angle of the L-pole moving contact 3.In the above solution, the purpose of setting the chute 111 is to connect with the handle link in the circuit breaker. The chute 111 is provided with a bent portion 1111 and a straight portion 1112, so that it can cooperate with the contact arm 22 of the latch 2 to position one end of the handle link, enabling it to be placed in the bent portion 1111 or slide into the straight portion 1112. When one end of the handle link is placed in the bent portion 1111, operating the circuit breaker handle, at this time the handle link can drive the moving contact mounting seat 1 to rotate. Specifically, the end of the handle link is always placed in the bent portion 1111 under the action of the contact arm 22. The end of the handle link refers to the part inserted into the chute 111, realizing the closing operation of the circuit breaker. When the latch 2 moves under an external force, the contact arm 22 of the latch 2 leaves above the bent portion 1111 of the chute 111, that is, losing the contact with the handle link. Then the handle link slides into the straight portion 1112 under the action of the side wall of the bent portion 1111 of the chute 111 and the handle, and the moving contact mounting seat 1 rotates to trip the circuit breaker; the latch 2 is rotationally matched with the arc-shaped convex column 114, and there will be a gap, and dust will enter the gap, without the problems of adhesion and increased friction caused by being affected by impurities such as dust and getting stuck. The setting of the rib 115 is to reduce the friction; the L-pole moving contact 3 is very convenient to install in the above manner. In addition, the two arms of the first torsion spring 5 are firmly fixed on the L-pole moving contact 3 and the moving contact mounting seat 1, and can well limit the rotation range of the L-pole moving contact 3. At the same time, the L-pole moving contact 3 is in closer contact with the static contact during closing, and will rotate first under the condition of large current, which is beneficial to quick opening.
[0023] In an embodiment of the present invention, a connecting column 121 is provided above the mounting post 14 on the second side 12 of the moving contact mounting seat 1. A convex edge 1211 is provided around the connecting column 121 for one week. A contact surface 12111 and a contact boss 12112 are respectively provided on the convex edge 1211. A third torsion spring 6 is sleeved on the connecting column 121. The first torsion arm of the third torsion spring 6 abuts against the contact surface 12111, and the second torsion arm of the third torsion spring 6 can abut against the contact boss 12112. Of course, a groove can also be provided on the contact boss 12112, and the third torsion spring 6 abuts in the groove. A second stopper 121121 is provided below the contact boss 12112. A positioning notch 121122 is formed between the second stopper 121121 and the side surface of the second side 12 of the moving contact mounting seat 1. A second bayonet 42 is provided on the N-pole moving contact 4. A second concave cavity 16 is provided on the second side 12 of the moving contact mounting seat 1 and corresponding to the second bayonet 42. The N-pole moving contact 4 is sleeved on the mounting post 14 on the second side 12 of the moving contact mounting seat 1. A second torsion spring 7 is provided between the N-pole moving contact 4 and the moving contact mounting seat 1. The second torsion spring 7 is also sleeved on the mounting post 14 on the second side 12 of the moving contact mounting seat 1. The first torsion arm of the second torsion spring 7 abuts against the positioning notch 121122, and the second torsion arm of the second torsion spring 7 abuts against the second bayonet 42 of the N-pole moving contact 4. The end of the second torsion arm of the second torsion spring 7 is bent and inserted into the second concave cavity 16. A positioning convex block 122 is provided on the second side 12 of the moving contact mounting seat 1. An N-pole limiting block 41 is provided on the N-pole moving contact 4 and located between the positioning convex block 122 and the contact boss 12112. The abutment between the N-pole limiting block 41 and the positioning convex block 122 or the contact boss 12112 constitutes the limit of the rotation angle of the N-pole moving contact 4; in the above solution, the function of the N-pole moving contact 4 is basically the same as that of the L-pole moving contact, and their purposes are all to better close or open the switch. In addition, the connecting column 121 is arranged in the above manner, and the convex edge 1211 provided around it can well protect the connecting column 121. Even if the connecting column 121 is broken, it does not affect the function of the third torsion spring 6. The contact boss 12112 provided on the convex edge 1211 enables the second contact arm of the third torsion spring 6 to temporarily abut against the contact boss 12112. The purpose is that when the circuit breaker base is installed, the second contact arm of the third torsion spring 6 can be clamped onto the convex block on the base through the bevel edge on the base, and mechanized installation can be realized.
[0024] In the embodiment of the present invention, the first torsion arm of the first torsion spring 5 is placed near the stopper 1121 of the limiting groove 1122. The spatial width of the limiting groove 1122 within the first torsion arm of the first torsion spring 5 is greater than the thickness of the L-pole moving contact 3. When the L-pole moving contact 3 rotates, the side of its positioning piece 32 can be inserted into the space of the limiting groove 1122 within the first torsion arm. The first torsion arm of the second torsion spring 7 is placed near the stopper 121121 of the positioning notch 121122. The spatial width of the positioning notch 121122 within the first torsion arm of the second torsion spring 7 is greater than the thickness of the N-pole moving contact 4. When the N-pole moving contact 4 rotates, the side of its limiting block 41 can be inserted into the space of the positioning notch 121122 within the first torsion arm of the second torsion spring 7. In the above solution, the limiting groove 1122 and the first torsion arm of the first torsion spring 5 are arranged according to the above solution, which can ensure that the movement range of the positioning piece 32 is not affected. In addition, the rotation of the positioning piece 32 will not affect the torsion spring, and the two do not interfere with each other. Similarly, the positioning notch 121122, the second torsion spring 7, and the limiting block 41 also have such functions.
[0025] In the embodiment of the present invention, ribs or grooves 17 are provided on the circumferential surface of the moving contact mount 1 and between the positioning piece 32 of the L-pole moving contact 3 and the limiting block 41 of the N-pole moving contact 4. The purpose is to increase the creepage distance. Since the positioning piece 32 and the limiting block 41 are relatively close to each other at this position, the product will not be easily burned. An arc barrier plate 23 and a convex piece 24 are provided below the lock 2. The function of the arc barrier plate 23 is to isolate the arc, and the function of the convex piece 24 is to be pulled by the bimetal pull rod. An arc-shaped contact surface 25 is provided on the lock 2 corresponding to the trip rod of the circuit breaker. The arc-shaped contact inclined surface 25 facilitates the pushing of the lock 2 by the lock trip rod. A contact inclined surface 26 is provided on the lock 2 and above the mounting post 14.
[0026] In an embodiment of the present invention, a groove 1113 is provided around the bottom of the sliding groove 111. The groove 1113 allows dust, impurities, etc. to enter without affecting the movement of the handle link. The upper side of the boss 112 and the lower side of the bending part 1111 of the sliding groove 111 are integrally formed to constitute a pressing surface 1123. After the circuit breaker is closed, the connecting end of the circuit breaker handle link abuts against the pressing surface 1123, and the included angle A between the thrust direction F1 of the circuit breaker handle on the connecting end of the handle link and the thrust direction F2 of the pressing surface 1123 on the connecting end of the handle link is less than 180 degrees. A closing and opening indicating plate 13 is provided above the moving contact mounting seat 1 in the sliding groove 11. By adopting the above solution, the safety of the product is increased. The above limitation on the pressing surface 1123 is to not only ensure the stable pressing of the pressing surface 1123 on the handle link during closing, but also ensure that when the latch rotates away from the handle link, the end of the link can slide into the straight part 1112 of the sliding groove 111 to disconnect the circuit breaker. It should be noted here that the included angle between the thrust direction of the handle on the connecting end of the handle link and the thrust direction of the pressing surface 1123 on the connecting end of the handle link is less than 180 degrees, so that the resultant force F3 generated by the two forces is upward. If the end of the handle link is blocked by the abutting arm 22 of the latch 2 above, the end of the handle link remains stationary in the bending part 1111 of the sliding groove. If the abutting arm 22 of the latch 2 above the end of the handle link moves away, the end of the handle link slides into the straight part 1112 of the sliding groove under the action of the upward force to achieve opening.
[0027] Finally, it should be noted that the terms of the upper, lower and other positional relationships described in this application document are based on the attached Figure 1 views of this application document for illustration.
Claims
1. A moving contact mechanism for a circuit breaker, comprising a moving contact mounting seat, a latch, an L-pole moving contact, and an N-pole moving contact. Mounting posts are provided on both sides of the moving contact mounting seat and on the same axis. The L-pole moving contact and the N-pole moving contact are respectively movably arranged on the mounting posts on both sides of the moving contact mounting seat. The side of the moving contact mounting seat where the L-pole moving contact is installed is the first side, and the side where the N-pole moving contact is installed is the second side. It is characterized in that: Above the first side of the moving contact mounting seat, there is a chute which has a bent portion and a straight portion. A resisting arm is provided on the latch, and this resisting arm is matched with the chute to lock or release the handle link of the circuit breaker. Below the chute, there is a boss, and below the boss, there is a positioning block. Around the bottom of the mounting post on the first side of the moving contact mounting seat, there is an arc-shaped convex column provided around its circumference. On the plane around the mounting post on the first side of the moving contact mounting seat, there are convex ribs. An installation through hole is provided on the latch, and the installation through hole of the latch is sleeved on the mounting post on the first side and forms a rotational fit with the arc-shaped convex column. The L-pole moving contact is sleeved on the mounting post on the first side and its side abuts or is close to the end of the arc-shaped convex column. A first bayonet is provided on the L-pole moving contact. At the position corresponding to the first bayonet on the moving contact mounting seat, there is a concave cavity. Below the boss, there is a stop block, and a limiting groove is formed between the stop block and the side surface of the first side of the moving contact mounting seat. A first torsion spring is provided between the L-pole moving contact and the moving contact mounting seat, and the first torsion spring is also sleeved on the mounting post on the first side. The first torsion arm of the first torsion spring abuts in the limiting groove below the boss, and the second torsion arm of the first torsion spring abuts on the first bayonet of the L-pole moving contact. The end wall of the second torsion arm of the first torsion spring has a bent portion, and this bent portion is inserted into the concave cavity below the first bayonet. A positioning piece is provided on the L-pole moving contact, and this positioning piece is located between the positioning block and the boss of the moving contact mounting seat. The abutment between the positioning piece and the positioning block or the boss constitutes the limit of the rotation angle of the L-pole moving contact.
2. The moving contact mechanism for a circuit breaker according to claim 1, characterized in that: Above the mounting post on the second side of the moving contact mounting seat, there is a connecting post. Around the circumference of the connecting post, there is a convex edge provided, and on the convex edge, there are respectively a resisting surface and a resisting boss. A third torsion spring is sleeved on the connecting post, and the first torsion arm of the third torsion spring abuts on the resisting surface, and the second torsion arm of the third torsion spring can abut on the resisting boss. Below the resisting boss, there is a second stop block, and a positioning notch is formed between the second stop block and the side surface of the second side of the moving contact mounting seat. A second bayonet is provided on the N-pole moving contact. At the position corresponding to the second bayonet on the second side of the moving contact mounting seat, there is a second concave cavity. The N-pole moving contact is sleeved on the mounting post on the second side of the moving contact mounting seat, and a second torsion spring is provided between the N-pole moving contact and the moving contact mounting seat. The second torsion spring is also sleeved on the mounting post on the second side of the moving contact mounting seat. The first torsion arm of the second torsion spring abuts on the positioning notch, and the second torsion arm of the second torsion spring abuts on the second bayonet of the N-pole moving contact, and the end of the second torsion arm of the second torsion spring is bent and inserted into the second concave cavity. A positioning convex block is provided on the second side of the moving contact mounting seat. An N-pole limiting piece is provided on the N-pole moving contact and is located between the positioning convex block and the resisting boss. The abutment between the N-pole limiting block and the positioning convex block or the resisting boss constitutes the limit of the rotation angle of the N-pole moving contact.
3. The moving contact mechanism for a circuit breaker according to claim 2, characterized in that: The first torsion arm of the first torsion spring is placed near the stopper in the limiting groove. The width of the space of the limiting groove within the first torsion arm of the first torsion spring is greater than the thickness of the L-pole moving contact. When the L-pole moving contact rotates, the side of its positioning piece can be inserted into the space of the limiting groove within the first torsion arm. The first torsion arm of the second torsion spring is placed near the stopper in the positioning notch. The width of the space of the positioning notch within the first torsion arm of the second torsion spring is greater than the thickness of the N-pole moving contact. When the N-pole moving contact rotates, the side of its limiting block can be inserted into the space of the positioning notch within the first torsion arm of the second torsion spring.
4. The moving contact mechanism for a circuit breaker according to claim 1 or 2, characterized in that: On the circumferential surface of the moving contact mounting seat and between the positioning piece of the L-pole moving contact and the N-pole limiting piece, there are convex ribs or grooves. Below the latch, there is a tab. At the position corresponding to the trip rod of the circuit breaker's release on the latch, there is an arc-shaped contact surface. Above the mounting post on the latch, there is a contact inclined surface.
5. The moving contact mechanism for a circuit breaker according to claim 1 or 2, characterized in that: Grooves are provided around the bottom of the sliding groove. The upper side of the convex platform and the lower side of the bending part of the sliding groove are integrally formed to constitute a pressing surface. After the circuit breaker is closed, the connecting end of the circuit breaker handle link abuts on the pressing surface, and the included angle between the thrust direction of the circuit breaker handle on the connecting end of the handle link and the thrust direction of the pressing surface on the connecting end of the handle link is less than 180 degrees. A closing and opening indicator board is provided above the moving contact mounting seat in the sliding groove.
6. The moving contact mechanism for a circuit breaker according to claim 4, characterized in that: Grooves are provided around the bottom of the sliding groove. The upper side of the convex platform and the lower side of the bending part of the sliding groove are integrally formed to constitute a pressing surface. After the circuit breaker is closed, the connecting end of the circuit breaker handle link abuts on the pressing surface, and the included angle between the thrust direction of the circuit breaker handle on the connecting end of the handle link and the thrust direction of the pressing surface on the connecting end of the handle link is less than 180 degrees. A closing and opening indicator board is provided above the moving contact mounting seat in the sliding groove.
Citation Information
Patent Citations
Moving contact mechanism of circuit breaker
CN214378288U