Linkage device for a latch, moving contact holder and moving contact of a circuit breaker

Abstract

The present invention relates to a circuit breaker, in particular to a locking buckle, a movable contact seat and a linkage device of the movable contact inside the circuit breaker. The present invention adopts the following technical scheme: a locking buckle, a movable contact seat and a linkage device of the movable contact of the circuit breaker, a mounting column is provided on the movable contact seat, the locking buckle and the movable contact are both movably sleeved on the mounting column, the upper end of the movable contact seat is provided with a slide groove for the end of the circuit breaker connecting rod to slide, the slide groove includes a curved portion and a straight portion, a resistance arm is provided at the upper end of the locking buckle, and a resistance surface is provided on the resistance arm, after the circuit breaker is disconnected, the resistance surface cooperates with the curved portion of the slide groove to lock the end of the circuit breaker connecting rod, and at this time, the handle can be pushed to close the circuit breaker; by adopting the above scheme; the present invention provides a new type of locking buckle, a movable contact seat and a linkage device of the movable contact of the circuit breaker, which can reduce parts through mechanical principles and mechanics principles, metal or plastic particles can fall into corresponding grooves or gaps, and does not affect the action of the movable contact.

Description

Technical Field

[0001] The present invention relates to a circuit breaker, in particular to a linkage device of a latch, a moving contact seat and a moving contact inside the circuit breaker. Background Art

[0002] The mechanism of traditional circuit breaker products generally has a lever, a latch and a trip latch. The structure is complex and the cost is high. The volume of the trip latch is not conducive to automatic assembly. Moreover, there are many product parts and there is a risk of product failure. Now, a circuit breaker is designed which can reduce parts through mechanical principles and mechanics principles, remove the trip latch and reduce the tripping force of the product. The fixing mechanism of traditional circuit breaker products uses a metal shaft. For products with contacts provided for both 1P+N or L pole and N pole, there are problems such as too small electrical clearance between the L pole and the N pole or breakdown of the withstand voltage between the L pole and the N pole after the breaking test. Therefore, the metal shaft is not used for product positioning, and the cooperation between the lever and the housing is used to achieve positioning. During the mechanical movement between the lever and the moving contact of the traditional circuit breaker, friction generates plastic or metal particles, which affect the movement of the contact. Therefore, a moving contact active contact surface corresponding to the moving contact is provided so that the moving contact abuts against the bottom contact. Metal or plastic particles can fall into the corresponding grooves, so as not to affect the movement of the moving contact. The plastic particles generated by the friction during the movement of the traditional latch and the lever can increase the tripping force and affect the action characteristics of the product. Summary of the Invention

[0003] The present invention overcomes the problems existing in the prior art and provides a new linkage device of a latch, a moving contact seat and a moving contact of a circuit breaker, which can reduce parts through mechanical principles and mechanics principles, and metal or plastic particles can fall into the corresponding grooves or gaps without affecting the movement of the moving contact.

[0004] To achieve the above object, the present invention adopts the following technical solution: A linkage device of a latch, a moving contact seat and a moving contact of a circuit breaker, including a latch, a moving contact seat and a moving contact. The latch and the moving contact are both arranged on the moving contact seat. The moving contact and the moving contact seat are linked through a torsion spring. The characteristic is that: an installation column is arranged on the moving contact seat. The latch and the moving contact are both movably sleeved on the installation column. The upper end of the moving contact seat is provided with a chute for the end of the circuit breaker connecting rod to slide. The chute includes a bending part and a straight part. A resisting arm is arranged at the upper end of the latch. A resisting surface is arranged on the resisting arm. After the circuit breaker is disconnected, the cooperation between the resisting surface and the bending part of the chute can lock the end of the circuit breaker connecting rod. At this time, the handle can be pushed to close the circuit breaker. After the circuit breaker is closed, the tripping mechanism of the circuit breaker acts on the latch to make the latch rotate, then the resisting surface loses the locking of the end of the connecting rod. At this time, the end of the connecting rod can slide into the straight part of the chute to disconnect the circuit breaker.

[0005] By adopting the above scheme, a new method is adopted to realize locking or unlocking the end of the circuit breaker connecting rod, which is simple, convenient and reliable in structure. In addition, through the cooperation between the contact surface of the lock buckle and the slide groove, it is only necessary to control the rotation of the lock buckle, which is very practical.

[0006] A further configuration of the present invention is that an inclined surface is provided on the interference arm on the outside of the interference surface, a lever arm is provided above the lock and below the interference arm, the interference arm and the lever arm are forked to form a fork, the width of the fork is greater than the diameter of the connecting rod end of the circuit breaker, and the upper side of the lever arm can push the connecting rod end of the circuit breaker when the circuit breaker is opened to cause the connecting rod end of the circuit breaker to slide into the straight part of the slide groove.

[0007] By adopting the above scheme, the setting of the inclined surface can well guide the end of the connecting rod into the curved part of the slide slot without any jamming phenomenon. The setting of the lever arm can push the end of the connecting rod to slide into the straight part of the slide slot when the circuit breaker is disconnected. What we want to explain here is that the circuit breaker opening refers to the automatic opening of the circuit breaker, not the opening of the circuit breaker by manual operation of the handle. This can ensure that the circuit breaker opening can be successful, thereby increasing the safety of the product.

[0008] A further configuration of the present invention is that: the resistance arm and the push arm are staggered, a positioning boss is provided below the slide slot of the moving contact seat, part of the upper side surface of the positioning boss is integrated with the lower side surface of the curved portion of the slide slot to form a pressing surface, and the pressing surface cooperates with the resistance surface to lock the end of the connecting rod of the circuit breaker so that the end of the connecting rod of the circuit breaker is placed in the curved portion of the slide slot, and the push arm is placed on the outer side surface of the positioning boss.

[0009] By adopting the above solution, the structure is more reasonable, wherein part of the upper side surface of the positioning boss and the lower side surface of the curved portion of the slide groove are integrated into a pressing surface. In this way, the pressing surface is relatively large, the locking end of the connecting rod will be more stable, and the stability of the product will be increased.

[0010] A further configuration of the present invention is that grooves are provided on both sides of the bottom of the slide groove, an arc-shaped convex column is provided around the bottom of the mounting column, a gap is formed between the arc-shaped convex columns, a circular through hole is provided on the lock buckle, the lock buckle is sleeved on the arc-shaped convex column through the circular through hole, a convex rib is provided on the moving contact seat and located at the periphery of the mounting column, and the inner side surface of the lock buckle contacts the convex rib.

[0011] By adopting the above solution, the arc-shaped boss can well ensure the flexibility of the lock buckle in rotation, and the arc-shaped boss and the notch can also well prevent metal particles or dust from adhering to the lock buckle and the moving contact seat.

[0012] The final setting of the present invention is: the moving contact is sleeved on the mounting column and its side surface abuts or is close to the end of the arc-shaped convex column, a torsion spring seat is arranged below the positioning boss, a positioning block is arranged on the moving contact seat below the spring seat, a bayonet is arranged on the moving contact, and the torsion spring is also sleeved on the mounting column, the first torsion arm of the torsion spring abuts on the torsion spring seat, the second torsion arm of the torsion spring abuts on the bayonet of the moving contact, a positioning piece is arranged on the moving contact for cooperating with the positioning block to limit the moving contact, the moving contact is arranged on the moving contact seat through the torsion spring, and the moving contact can rotate on the moving contact seat under the action of external force, and arc isolation bosses or convex ribs are arranged on the front and rear side surfaces of the lock buckle.

[0013] By adopting the above solution, the moving contact is installed reasonably, especially when the mechanism is in the case of large current, the mechanism can first push the moving contact to disconnect, thereby increasing the safety of the product.

[0014] The present invention will be further described below in conjunction with specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A three-dimensional diagram of an embodiment of the present invention;

[0016] Figure 2 A three-dimensional diagram of a moving contact seat according to an embodiment of the present invention;

[0017] Figure 3 This is a structural diagram of a lock according to an embodiment of the present invention;

[0018] Figure 4 This is a structural diagram of the lock and the moving contact in the embodiment of the present invention;

[0019] Figure 5 This is a structural diagram of a lock reflecting a fork in an embodiment of the present invention;

[0020] Figure 6 It is a rear structural diagram of a lock buckle according to an embodiment of the present invention;

[0021] Figure 7 This is a structural diagram of the lock catch and the moving contact seat in the disconnected position of the product according to the embodiment of the present invention;

[0022] Figure 8 This is a structural diagram of the lock catch and the moving contact seat of the product of the embodiment of the present invention when they are just beginning to close;

[0023] Figure 9 This is a structural diagram of the lock catch and the moving contact seat in the closing process of the product of the embodiment of the present invention;

[0024] Figure 10 This is a structural diagram of the lock and the moving contact seat after the product of the embodiment of the present invention is closed;

[0025] Figure 11Structural diagram of the cooperation between the latch and the moving contact seat when the product of the embodiment of the present invention is about to trip;

[0026] Figure 12 Structural diagram of the cooperation between the latch and the moving contact seat when the product of the embodiment of the present invention is forced to trip;

[0027] Figure 13 Structural diagram of the cooperation between the latch and the moving contact seat during the process of the handle returning to its original position after the product of the embodiment of the present invention trips;

[0028] Figure 14 Structural diagram of the cooperation between the latch and the moving contact seat when the moving contact of the mechanism is knocked open by the electromagnetic mechanism during a short circuit of the product of the embodiment of the present invention;

[0029] Figure 15 Structural diagram of the cooperation between the latch and the moving contact seat when the moving contact does not return to its original position after the moving contact of the mechanism is knocked open by the electromagnetic mechanism during a short circuit of the product of the embodiment of the present invention. Detailed implementation mode

[0030] As Figures 1 - 15 shown, a linkage device for the latch, moving contact seat and moving contact of a circuit breaker includes a latch 1, a moving contact seat 2 and a moving contact 3. The latch 1 and the moving contact 3 are both arranged on the moving contact seat 2. Here, the moving contact 3 refers to the L-pole moving contact. The N-pole moving contact can also be arranged on the reverse side of the moving contact seat 2, which is set according to needs and will not be described in detail here. The moving contact 3 and the moving contact seat 2 are linked through a torsion spring 5. In the embodiment of the present invention, an installation post 21 is arranged on the moving contact seat 2. The latch 1 and the moving contact 3 are both movably sleeved on the installation post 21. The upper end of the moving contact seat 2 is provided with a chute 211 for the end 4 of the circuit breaker connecting rod to slide. The chute 211 includes a bending part 2111 and a straight part 2112. The upper end of the latch 1 is provided with a resisting arm 11, and a resisting surface 111 is arranged on the resisting arm 11. After the circuit breaker is disconnected, the cooperation between the resisting surface 111 and the bending part 2111 of the chute 211 can lock the end 4 of the circuit breaker connecting rod. At this time, the handle can be pushed to close the circuit breaker, Figure 8 and Figure 9 ; after the circuit breaker is closed, the offline mechanism of the circuit breaker acts on the latch 1 to make the latch 1 rotate, then the resisting surface 111 loses the locking of the end 4 of the connecting rod. At this time, the end 4 of the connecting rod can slide into the straight part 2112 of the chute 211 to disconnect the circuit breaker, Figure 14 and Figure 15 . By adopting the above scheme, a new method is used to lock or unlock the end 4 of the circuit breaker connecting rod, which is simple and convenient. In addition, through the cooperation between the resisting surface 111 of the latch 1 and the chute 211, as long as the rotation of the latch 1 is controlled, it is very practical and reliable in performance.

[0031] In an embodiment of the present invention, a slope 112 is provided on the outer side of the contact arm 11 at the contact surface 111. A dialing arm 12 is provided above the latch 1 and below the contact arm 11. The contact arm 11 and the dialing arm 12 are arranged in a fork shape to form a fork opening 13. The width of the fork opening 13 is greater than the diameter of the connecting rod end 4 of the circuit breaker. The upper side surface 121 of the dialing arm 12 can dial the connecting rod end 4 of the circuit breaker during the opening of the circuit breaker to cause the connecting rod end 4 of the circuit breaker to slide into the straight part 2112 of the chute 211. By adopting the above solution, the slope 112 can well guide the connecting rod end 4 into the bending part 2111 of the chute 211 without jamming. The dialing arm 12 can dial the connecting rod end 4 to slide into the straight part 2112 of the chute when the circuit breaker is disconnected. It should be noted that the opening of the circuit breaker here refers to the automatic opening of the circuit breaker, not the manual operation of the handle to open the circuit breaker. The above structure can ensure the successful opening of the circuit breaker and improve the safety of the product.

[0032] In an embodiment of the present invention, the contact arm 11 and the dialing arm 12 are arranged in a staggered manner. A positioning boss 22 is provided below the chute 211 of the moving contact seat 2. Part of the upper side surface 221 of the positioning boss 22 is integrally provided with the lower side surface of the bending part 2111 of the chute 211 to form a pressing surface. The pressing surface cooperates with the contact surface 111 to lock the connecting rod end 4 of the circuit breaker so that the connecting rod end 4 of the circuit breaker is placed in the bending part 2111 of the chute 211. The dialing arm 12 is placed on the outer side surface of the positioning boss 22. By adopting the above solution, the structure is more reasonable. Part of the upper side surface 221 of the positioning boss 22 is integrally provided with the lower side surface of the bending part 2111 of the chute 211 to form a pressing surface. In this way, the pressing surface is relatively large, and the locking of the connecting rod end 4 will be more stable, improving the stability of the product.

[0033] In an embodiment of the present invention, grooves 21111 are provided on both sides of the bottom of the chute 211. An arc-shaped convex column 212 is provided around the bottom of the mounting post 21. A notch is formed between the arc-shaped convex columns 212. A circular through hole 14 is provided on the latch 1. The latch 1 is sleeved on the arc-shaped convex column 212 through the circular through hole 14. A convex rib 213 is provided on the moving contact seat 2 around the mounting post 21. The inner side surface of the latch 1 contacts the convex rib 213. By adopting the above solution, the flexibility of the rotation of the latch 1 can be well ensured, and it can also well prevent metal particles or dust from sticking to the latch 1 and the moving contact seat 2.

[0034] In an embodiment of the present invention, the moving contact 3 is sleeved on the mounting post 21 and its side abuts against or is close to the end of the arc-shaped convex post 212. A torsion spring seat 222 is provided below the positioning boss 22. A positioning block 23 is provided below the torsion spring seat 222 of the moving contact seat 2. A bayonet 31 is provided on the moving contact 3. The torsion spring 5 is also sleeved on the mounting post 21. The first torsion arm of the torsion spring 5 abuts against the torsion spring seat 222, and the second torsion arm of the torsion spring 5 abuts against the bayonet 31 of the moving contact 3. A positioning piece 32 that cooperates with the positioning block 23 to limit the moving contact is provided on the moving contact 3. The moving contact 3 is arranged on the moving contact seat 2 through the torsion spring 5. Under the action of an external force, the moving contact 3 can rotate on the moving contact seat 2. In this way, in the case of a large current, the mechanism can first push the moving contact to disconnect, increasing the safety of the product. Arc isolation bosses or ribs 15 are provided on both the front and rear side surfaces of the latch 1. The purpose of these arc isolation bosses and ribs is to prevent the arc from passing through and increase the creepage distance.

Claims

1. A linkage device for a handle, a latch, a moving contact seat and a moving contact of a circuit breaker, comprising a handle, a latch, a moving contact seat and a moving contact. A connecting rod is arranged between the handle and the moving contact seat. The first end of the connecting rod is connected to the handle, and the second end of the connecting rod is connected to the moving contact seat. Both the latch and the moving contact are arranged on the moving contact seat. The moving contact and the moving contact seat are linked through a torsion spring. Characterized in that: An installation post is integrally arranged on the moving contact seat. Both the latch and the moving contact are movably sleeved on the installation post. The upper end of the moving contact seat is provided with a chute for the end of the connecting rod of the circuit breaker to slide. The chute includes a bent part and a straight part. A resisting arm is arranged at the upper end of the latch, and a resisting surface is arranged on the resisting arm. After the circuit breaker is disconnected, the resisting surface cooperates with the bent part of the chute to lock the second end of the connecting rod of the circuit breaker. At this time, the handle can be pushed to close the circuit breaker. After the circuit breaker is closed, the off - line mechanism of the circuit breaker acts on the latch to make the latch rotate, and then the resisting surface loses the lock on the second end of the connecting rod. At this time, the second end of the connecting rod can slide into the straight part of the chute to disconnect the circuit breaker.

2. The linkage device for a handle, a latch, a moving contact seat and a moving contact of a circuit breaker according to claim 1, Characterized in that: The bent part of the chute bends downward at the end close to the handle, and a pressing and limiting surface is arranged on the lower side of the bent part. After the circuit breaker is closed, the second end of the connecting rod abuts against the pressing and limiting surface. At this time, the included angle between the thrust direction generated by the handle on the second end of the connecting rod and the thrust direction generated by the pressing and limiting surface on the second end of the connecting rod is less than 180 degrees.

3. The linkage device for a handle, a latch, a moving contact seat and a moving contact of a circuit breaker according to claim 1 or 2, Characterized in that: On the resisting arm, an inclined surface for the second end of the connecting rod to slide into the bent part of the chute is arranged outside the resisting surface. Above the latch and below the resisting arm, a dialing arm is arranged. The resisting arm and the dialing arm are arranged in a forked manner to form a fork opening. The width of the fork opening is greater than the diameter of the second end of the connecting rod of the circuit breaker. The upper side of the dialing arm can dial the second end of the connecting rod of the circuit breaker during the opening of the circuit breaker to prompt the second end of the connecting rod of the circuit breaker to slide into the straight part of the chute.

4. The linkage device for a handle, a latch, a moving contact seat and a moving contact of a circuit breaker according to claim 3, Characterized in that: The resisting arm and the dialing arm are arranged in a staggered manner. A positioning boss is arranged below the chute of the moving contact seat. Part of the upper side of the positioning boss is integrally arranged with the lower side of the bent part of the chute to form a pressing and limiting surface. The pressing and limiting surface cooperates with the resisting surface to lock the second end of the connecting rod of the circuit breaker so that the second end of the connecting rod of the circuit breaker is placed in the bent part of the chute. The dialing arm is arranged on the outer side of the positioning boss.

5. The linkage device for a handle, a latch, a moving contact seat and a moving contact of a circuit breaker according to claim 4, Characterized in that: Both sides of the bottom of the chute are provided with grooves. An arc-shaped convex column is arranged around the bottom of the mounting post. A notch is formed between the arc-shaped convex columns. A circular through hole is provided on the latch. The latch is sleeved on the arc-shaped convex column through the circular through hole. A convex rib is arranged on the moving contact seat and around the mounting post. The inner side of the latch contacts the convex rib.

6. The linkage device of the handle, latch, moving contact seat and moving contact of the circuit breaker according to claim 5, characterized in that: The moving contact is sleeved on the mounting post and its side abuts against or is close to the end of the arc-shaped convex column. A limiting block is arranged below the positioning boss. A positioning opening is formed between the limiting block and the moving contact seat. A positioning block is arranged on the moving contact seat below the positioning boss. A bayonet is arranged on the moving contact. A concave cavity is arranged on the moving contact seat corresponding to the bayonet. The torsion spring is also sleeved on the mounting post. The first torsion arm of the torsion spring abuts against the positioning opening. The second torsion arm of the torsion spring abuts against the bayonet of the moving contact. The end of the second torsion arm is bent and inserted into the concave cavity. A positioning piece is arranged on the moving contact between the positioning boss and the positioning block. The positioning piece restricts the rotation angle of the moving contact by abutting against the positioning boss or the positioning block.

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