A multi-pole circuit breaker and a synchronous tripping device thereof

Abstract

The utility model discloses a multi-pole circuit breaker and a synchronous tripping device thereof, which are used to solve the problem that the multi-pole disconnection cannot be synchronized, causing the circuit breaker to slip, trip, and fail to close. The technical solution to this problem is mainly a synchronous tripping device including a bracket rod, a straight top rod, a bent top rod, and a synchronous pin. The straight top rod and the bent top rod are respectively arranged at both ends of the bracket rod. The straight top rod and the bent top rod are both provided with protrusions at the same horizontal position. The center of the protrusion is provided with a through hole of the same size. The lower end of the straight top rod protrusion is provided with an avoidance groove. The bracket rod is provided with a through pin hole. The synchronous pin passes through the through pin hole and is connected with the through pin hole of another bracket rod. The number of bracket rods is at least two. The utility model sets a synchronous tripping device, so that when one of the electrodes of the multi-pole circuit breaker fails and trips, the remaining electrodes can be tripped synchronously, thereby improving the product qualification rate and reducing the failure rate of the circuit breaker.

Description

Technical Field

[0001] The utility model relates to the field of circuit breakers, in particular to a multi-pole circuit breaker and a synchronous tripping device thereof. Background Art

[0002] Circuit breakers are important power control and protection devices for safe power supply and reliable operation. Synchronous tripping means that when any pole of a multi-pole circuit breaker trips due to a fault current, the remaining poles can also synchronously cut off the fault power supply in a very short time. The main function of the synchronous tripping device is that when a multi-pole circuit breaker encounters a fault power supply impact such as overcurrent, short circuit, undervoltage, leakage, overheating, shunt, lightning strike, etc., due to the short board effect, the most sensitive pole in the multi-pole circuit breaker is first triggered to trip, which is the active tripping pole. After one of the poles actively trips, the synchronous tripping device drives the remaining poles to trip. At present, multi-pole circuit breaker products are all composed of single poles in parallel. Most multi-pole connection devices have problems such as poor consistency in part size and inability to synchronize multi-pole disconnection, which causes the circuit breaker to slip, trip, and fail to close, affecting safe production.

[0003] Prior art CN116013743A discloses a synchronous tripping linkage device for a multi-pole circuit breaker and a working method thereof. The utility model sets a synchronous tripping linkage device with a long comb-shaped structure. When the active tripping pole of the multi-pole circuit breaker trips, the crank mechanism of the active tripping pole pushes the force-bearing end of the transmission plate counterclockwise through the trigger rod, so that the transmission plate rotates rapidly counterclockwise, and the working end of the transmission plate presses the corresponding comb finger of the synchronous tripping linkage device, so that the synchronous tripping linkage device rotates around the positioning installation hole along the comb rod axis at both ends. The rotation displacement and the pressing force are transmitted to the remaining comb fingers in parallel through the comb rod of the synchronous tripping linkage device, so that the remaining passive tripping poles are mechanically unlocked to achieve synchronous disconnection. Although the above scheme effectively realizes the synchronous tripping of the remaining poles when the electrode is tripped, reduces the failure rate of the circuit breaker, and improves the ability of the circuit breaker to resist vibration and impact. However, since the long comb-shaped structure is integrally formed and the comb fingers are in sheet form, the comb fingers are easily worn, resulting in insufficient response. When the comb fingers are damaged, the entire structure needs to be replaced, which increases the maintenance cost. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a multi-pole circuit breaker and a synchronous tripping device thereof, aiming to solve the problems of the synchronous tripping in the prior art that the response is not timely enough, the loading and unloading is troublesome, and the maintenance cost is high, so as to make the synchronous tripping of the circuit breaker more stable and reliable, reduce the failure rate of the circuit breaker, and improve the vibration and impact resistance of the circuit breaker.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a synchronous tripping device, including a support rod, a straight push rod, a bent push rod and a synchronous pin, the straight push rod and the bent push rod are respectively arranged at both ends of the support rod, the straight push rod and the bent push rod are provided with protrusions at the same horizontal position, the center of the protrusion is provided with a through hole of the same size, the lower end of the straight push rod protrusion is provided with an avoidance groove, the support rod is provided with a through pin hole, the synchronous pin passes through the through pin hole and is connected with the through pin hole of another support rod, and the number of support rods is at least two.

[0006] The length of the synchronization pin is determined by the number of bracket rods.

[0007] Blind pin holes are respectively provided at both ends of the support rod, and the number of synchronization pins is determined by the number of support rods.

[0008] The bending angle of the bending top rod is α, 90°≤α≤120°.

[0009] A multi-stage circuit breaker comprises the above-mentioned synchronous tripping device, a support seat and an inductive driving member, wherein the support seat is provided with a first fixed shaft and a tripping buckle, the first fixed shaft passes through the through hole at the center of the protrusion of the straight top rod and the bent top rod, the inductive driving member is used for inducing the electrode to fall off and make the synchronous tripping device rotate relative to the first fixed shaft, and the tripping buckle is arranged on the movement track of the straight top rod.

[0010] The inductive driving part comprises a moving contact piece and a collision block, the moving contact piece and the collision block are fixedly connected, and the moving contact piece senses the action of the electrode to release and drive the collision block to act on the bending top rod.

[0011] The support seat is provided with a second fixed shaft, the collision block is provided with a through hole and a collision rivet matched with the second fixed shaft, and the collision block rotates relative to the second fixed shaft to drive the collision rivet to collide with the bent ejector rod.

[0012] The multistage circuit breaker includes a handle, a connecting block and a third fixed shaft. The handle is provided with a through hole matching the third fixed shaft. The number of handles is consistent with the number of bracket rods. The connecting block is respectively connected to the first fixed shaft and the third fixed shaft.

[0013] The multi-stage circuit breaker also includes a connecting pin. The outer end of the handle is provided with a pin hole matched with the connecting pin. The connecting pin passes through the pin hole and is connected with the pin hole of another handle.

[0014] The beneficial effects of the utility model are as follows: the synchronous tripping device of the utility model is installed on the first fixed shaft, and the synchronous tripping device can rotate relative to the first fixed shaft. When one of the poles of the multi-pole circuit breaker is tripped, the inductive driving part can sense the electrode tripping and drive the bent top rod to rotate. Since the rotation centers of the bent top rod and the straight top rod are at the same horizontal position, the straight top rod will synchronously rotate and collide with the tripping buckle to make the corresponding electrode tripped, and the bracket rod will follow the rotation. Since the synchronous pin is connected to multiple bracket rods, it will drive the electrodes corresponding to the remaining bracket rods to trip, so as to achieve timely multi-electrode synchronous tripping, reduce the failure rate of the circuit breaker, and improve the circuit breaker's ability to resist vibration and impact. Since the bracket rod and the synchronous pin are hole-shaft matched, when one of the components of the synchronous tripping device is damaged, it can be easily disassembled, repaired and replaced.

[0015] 2) By providing blind pin holes at both ends of the bracket rod, the synchronization pins are respectively connected to the blind pin holes of different bracket rods, which is convenient for disassembly during maintenance.

[0016] 3) The handle and the synchronous tripping device are linked by setting a connection block. When the electrode needs to be actively tripped, the handle can be controlled to be linked, which is convenient for user operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings:

[0018] Figure 1 It is a schematic diagram of a synchronous tripping device of the utility model;

[0019] Figure 2 It is a side view of a multi-pole circuit breaker of the utility model;

[0020] Figure 3 The utility model is a schematic diagram of a multi-pole circuit breaker.

[0021] In the figure: 1. bracket rod; 2. synchronization pin; 3. straight push rod; 4. bent push rod; 5. support seat; 51. first fixed axis; 52. release buckle; 53. second fixed axis; 6. moving contact piece; 7. collision block; 71. collision rivet; 8. handle; 9. connecting block; 10. third fixed axis; 11. connecting pin. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0023] The terms "first", "second", etc. (if any) in the specification and claims of the present utility model are used to distinguish similar objects, rather than to describe a specific order or sequence. Even if "second" is used to distinguish a certain technical feature, it does not necessarily mean that it has "first". It should be understood that in the present utility model, "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. It should be understood that in the present utility model, "multiple" means two or more. "And / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, X and / or Y can represent: X exists alone, X and Y exist at the same time, and Y exists alone. The character " / " generally indicates that the related objects before and after are in an "or" relationship. "Contains X, Y and Z", "Contains X, Y, Z" means that X, Y, and Z are all included, "Contains X, Y or Z" means that one of X, Y, and Z is included, and "Contains X, Y and / or Z" means that any one, any two, or three of X, Y, and Z are included.

[0024] The following specific embodiments are used to describe the technical solution of the utility model in detail. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments. Example

[0025] like Figure 1 A synchronous tripping device shown in the figure comprises a support rod 1, a straight push rod 3, a bent push rod 4 and a synchronous pin 2. The straight push rod 3 and the bent push rod 4 are respectively arranged at both ends of the support rod 1. The straight push rod 3 and the bent push rod 4 are both provided with protrusions at the same horizontal position. The center of the protrusion is provided with a through hole of the same size. The lower end of the protrusion of the straight push rod 3 is provided with an avoidance groove. The support rod 1 is provided with a through pin hole. The synchronous pin 2 passes through the through pin hole and is connected with the through pin hole of another support rod 1. The number of support rods 1 is at least two. The length of the synchronous pin 2 is determined by the number of support rods 1. The bending angle of the bent push rod 3 is α, 90°≤α≤120°.

[0026] like Figure 2-3As shown, a multi-pole circuit breaker includes the above-mentioned synchronous tripping device, a support seat 5 and an inductive driving member, wherein the support seat 5 is provided with a first fixed shaft 51 and a tripping buckle 52, the first fixed shaft 51 passes through the through hole at the center of the protrusion of the straight top rod 3 and the bent top rod 4, the inductive driving member is used to sense the electrode action and make the synchronous tripping device rotate relative to the first fixed shaft 51, and the tripping buckle 52 is arranged on the motion track of the straight top rod 3. The inductive driving member includes a moving contact piece 6 and a collision block 7, the moving contact piece 6 and the collision block 7 are fixedly connected, and the moving contact piece 6 senses the electrode action and tripping to drive the collision block 7 to act on the bent top rod 3. The support seat 5 is provided with a second fixed shaft 53, and the collision block 7 is provided with a through hole and a collision rivet 71 that cooperates with the second fixed shaft 53, and the collision block 7 rotates relative to the second fixed shaft 53 to drive the collision rivet 71 to hit the bent top rod 4.

[0027] When one of the stages of the multi-pole circuit breaker trips, the corresponding moving contact piece 6 senses the electrode tripping and rotates downward. Since the collision block 7 is fixedly connected to the moving contact piece 6, it rotates with the moving contact piece 6, so that the collision rivet 71 on the collision block 7 will hit the corresponding pole's bent top rod 4. After the impact force, the bent top rod 4 rotates relative to the first fixed rod 51. Since the bent top rod 4, the straight top rod 3 and the support rod 1 are an integrated structure, the straight top rod 3 will also rotate synchronously and collide with the trip buckle 52 to make the corresponding electrode actively trip. When the support rod 1 rotates, the synchronization pin 2 will also drive the other support rods 1 to rotate synchronously, so that the corresponding straight top rod 3 will also hit the other trip buckles 52 to make the other electrodes actively trip, achieving the effect of synchronous tripping of the multi-pole circuit breaker. Example

[0028] Blind pin holes are provided at both ends of the support rod 1, and the number of synchronization pins 2 is determined by the number of support rods 1. The two ends of the synchronization pin 1 are respectively connected to the blind pin holes of different support rods 1, and the length of the synchronization pin 2 is reasonably selected according to the spacing between each electrode of the multi-pole circuit breaker. When the components in the synchronous tripping device are damaged, only the synchronization pins 2 at both ends of the corresponding support rod 1 need to be removed to replace the components, thereby shortening the maintenance time. Example

[0029] like Figure 2-3As shown, the multi-stage circuit breaker includes a handle 8, a connecting block 9 and a third fixed shaft 10. The handle 8 is provided with a through hole that matches the third fixed shaft 10. The number of the handles 10 is consistent with the number of the bracket rods 1. The connecting block 9 is respectively connected to the first fixed shaft 51 and the third fixed shaft 10. The multi-stage circuit breaker also includes a connecting pin 11. The outer end of the handle 8 is provided with a pin hole that matches the connecting pin 11. The connecting pin 11 passes through the pin hole and is connected to the pin hole of another handle 8. When the user needs to check or repair the multi-stage circuit breaker, by rotating the handle 8, the connecting block 9 links the handle 8 and the synchronous tripping device. The synchronous tripping device will rotate synchronously with the handle 8 to make each electrode of the multi-stage circuit breaker trip synchronously and cut off the current, which effectively improves the safety of maintenance and reduces the risk of electric shock.

[0030] In addition to the above-mentioned preferred embodiments, the present invention also has other implementation modes. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present invention.

Claims

1. A synchronous tripping device, characterized in that: The invention comprises a support rod (1), a straight push rod (3), a bent push rod (4) and a synchronous pin (2), wherein the straight push rod (3) and the bent push rod (4) are respectively arranged at two ends of the support rod (1), the straight push rod (3) and the bent push rod (4) are both provided with protrusions at the same horizontal position, through holes of the same size are arranged at the center of the protrusions, an avoidance groove is arranged at the lower end of the protrusion of the straight push rod (3), the support rod (1) is provided with a through pin hole, the synchronous pin (2) passes through the through pin hole and is connected to the through pin hole of another support rod (1), and the number of the support rods (1) is at least two.

2. A synchronous tripping device according to claim 1, characterized in that: The length of the synchronization pin (2) is determined by the number of support rods (1).

3. A synchronous tripping device according to claim 1, characterized in that: Blind pin holes are respectively provided at both ends of the support rod (1), and the number of synchronization pins (2) is determined by the number of support rods (1).

4. A synchronous tripping device according to claim 1, characterized in that: The bending angle of the bent top rod (4) is α, 90°≤α≤120°.

5. A multi-pole circuit breaker, characterized in that: The invention comprises a synchronous tripping device as claimed in any one of claims 1 to 4, a support seat (5) and an inductive driving member, wherein the support seat (5) is provided with a first fixed shaft (51) and a tripping buckle (52), the first fixed shaft (51) passes through a through hole at the center of a protrusion of a straight top rod (3) and a curved top rod (4), the inductive driving member is used for sensing the electrode action to fall off and causing the synchronous tripping device to rotate relative to the first fixed shaft (51), and the tripping buckle (52) is arranged on the movement trajectory of the straight top rod (3).

6. A multi-pole circuit breaker according to claim 5, characterized in that: The inductive drive component comprises a moving contact piece (6) and a collision block (7), wherein the moving contact piece (6) and the collision block (7) are fixedly connected, and the moving contact piece (6) senses the electrode action and releases, driving the collision block (7) to act on the bending top rod (4).

7. A multi-pole circuit breaker according to claim 6, characterized in that: The support seat (5) is provided with a second fixed shaft (53), the collision block (7) is provided with a through hole and a collision rivet (71) that cooperate with the second fixed shaft (53), and the collision block (7) rotates relative to the second fixed shaft (53) to drive the collision rivet (71) to collide with the bent top rod (4).

8. A multi-pole circuit breaker according to claim 5, characterized in that: It also comprises a handle (8), a connecting block (9) and a third fixed shaft (10); the handle (8) is provided with a through hole that cooperates with the third fixed shaft (10); the number of the handles (8) is consistent with the number of the support rods (1); the connecting block (9) is respectively connected to the first fixed shaft (51) and the third fixed shaft (10).

9. A multi-pole circuit breaker according to claim 8, characterized in that: It also comprises a connecting pin (11), the outer end of the handle (8) is provided with a pin hole which matches the connecting pin (11), and the connecting pin (11) passes through the pin hole to be connected with the pin hole of another handle (8).

Images