Electromagnetic tripping device of circuit breaker

Abstract

The electromagnetic tripping device comprises a circuit breaker operating mechanism, a tripping transmission rod and a support, a tripping pull plate is arranged on one side of the outer wall of the circuit breaker operating mechanism, and one end of the tripping pull plate extends backwards to the rear end of the circuit breaker operating mechanism and is movably connected with one end of the tripping transmission rod to achieve the tripping function. The other end of the tripping transmission rod is connected with an armature, a busbar is installed in the support, and the armature moves on the inner side of the support. By adopting the design of the structural scheme, the circuit breaker has electronic and electromagnetic double-protection tripping modes at the same time, and the electromagnetic tripping device is additionally arranged on the circuit breaker, so that the double-protection effect can be achieved, and the service life of the circuit breaker is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, and specifically relates to an electromagnetic tripping device for a circuit breaker. Background Art

[0002] A circuit breaker is a mechanical switching device used to connect, carry, and break the current under normal circuit conditions, and to connect, carry for a certain time, and break the current under specified abnormal circuit conditions. It is a protection device in the power system for controlling the current and protecting electrical equipment from damage caused by faults such as overload and short circuit.

[0003] However, the existing circuit breakers are only designed with electronic tripping devices and do not adopt the combined scheme of electronic and electromagnetic types, resulting in the defect of dual protection, thus reducing the service life of the circuit breaker. Summary of the Invention

[0004] The purpose of the utility model is to provide an electromagnetic tripping device for a circuit breaker to solve the problem mentioned in the above background art that the existing circuit breakers are only designed with electronic tripping devices and do not adopt the combined scheme of electronic and electromagnetic types, resulting in the defect of dual protection, thus reducing the service life of the circuit breaker.

[0005] To achieve the above purpose, the utility model provides the following technical solution: An electromagnetic tripping device for a circuit breaker, including a circuit breaker operating mechanism, a tripping transmission rod, and a bracket. One side of the outer wall of the circuit breaker operating mechanism is provided with a tripping pull plate, and one end of the tripping pull plate extends backward to the rear end of the circuit breaker operating mechanism and is movably connected to one end of the tripping transmission rod to achieve the tripping function. The other end of the tripping transmission rod is connected with an armature, a bus bar is installed inside the bracket, and the armature moves inside the bracket.

[0006] Preferably, a yoke iron is arranged between the inner wall of the bracket and the bus bar, and the bracket is connected to the bus bar and the yoke iron through fastening screws.

[0007] Preferably, the yoke iron is designed with a concave structure, and the outer wall of the yoke iron fits with the inner wall of the bracket.

[0008] Preferably, a sliding groove is formed on the outer wall surface of the bracket.

[0009] Preferably, sliding blocks are fixedly connected to both sides of the outer wall of the armature, and the sliding blocks are horizontally slidably connected in the sliding groove. Fixing rings are fixedly connected to both ends of the surface of the outer wall of the armature away from the bus bar.

[0010] Preferably, a tension spring is fixedly connected to the fixing ring.

[0011] Advantageous Effects

[0012] Compared with the existing technologies, the beneficial effects of the present utility model are as follows:

[0013] 1. With the design of the above structural scheme, the circuit breaker has a tripping method with dual protection of electronic and electromagnetic types. Adding this electromagnetic tripping device to the circuit breaker can achieve the dual protection effect, thereby improving the service life of the circuit breaker.

[0014] 2. At the same time, fixing rings are fixed at both ends of the armature surface, and a tension spring is connected to the fixing rings. With the structure of dual tension springs, the force is balanced and the stability is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the overall matching structure of the present utility model;

[0016] Figure 2 is a front view structural schematic diagram of the present utility model;

[0017] Figure 3 In the present utility model Figure 2 is a schematic diagram of the structure in the A direction;

[0018] Figure 4 In the present utility model Figure 2 is a schematic diagram of the structure in the B direction.

[0019] 1. Circuit breaker operating mechanism; 2. Tripping pull plate; 3. Tripping transmission rod; 4. Busbar; 5. Yoke iron;

[0020] 6. Bracket; 7. Armature; 8. Sliding groove; 9. Fixing ring; 10. Sliding block; 11. Fastening screw;

[0021] 12. Tension spring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The technical solutions of the present utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0023] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", "vertical", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0024] As Figures 1-4 It is a schematic structural diagram of an electromagnetic tripping device of a circuit breaker according to a preferred embodiment of the present utility model. In this embodiment, an electromagnetic tripping device of a circuit breaker includes a circuit breaker operating mechanism 1, a tripping transmission rod 3, and a bracket 6. A tripping pull plate 2 is provided on one side of the outer wall of the circuit breaker operating mechanism 1, and one end of the tripping pull plate 2 extends backward to the rear end of the circuit breaker operating mechanism 1 and is movably connected to one end of the tripping transmission rod 3 to achieve the tripping function. The other end of the tripping transmission rod 3 is connected to an armature 7. A busbar 4 is installed inside the bracket 6, and the function of the busbar 4 is to conduct current as a carrier. The armature 7 moves inside the bracket 6.

[0025] In this embodiment, a yoke iron 5 is provided between the inner wall of the bracket 6 and the busbar 4. The bracket 6 is connected to the busbar 4 and the yoke iron 5 by fastening screws 11. This structural design has the advantages of simple installation, convenient operation, and easy disassembly and assembly in the later stage.

[0026] In this embodiment, the yoke iron 5 is designed in a concave shape, and the outer wall of the yoke iron 5 fits with the inner wall of the bracket 6.

[0027] In this embodiment, sliding grooves 8 are formed on the outer wall surface of the bracket 6. Sliding blocks 10 are fixedly connected to both sides of the outer wall of the armature 7. Due to the principle of electromagnetic induction, the yoke iron 5 conducts electricity and adsorbs the armature 7 through the busbar 4, so that the sliding blocks 10 are horizontally slidably connected in the sliding grooves 8, and at the same time, it also plays a role in limiting the armature 7. Fixed rings 9 are fixedly connected to both ends of the surface of the outer wall of the armature 7 away from the busbar 4.

[0028] In this embodiment, a tension spring 12 is fixedly connected to the fixed ring 9, and the other end of the tension spring 12 is connected to the insulating housing.

[0029] Working principle

[0030] During specific use, when the instantaneous current carried by the circuit breaker exceeds a predetermined value (usually n times the rated current), due to the generation of magnetism by electricity, when the suction force of the yoke iron 5 is greater than the force of the tension spring 12, the armature 7 will be instantly attracted upwards. Since the trip transmission rod 3 is fixed to the armature 7, when the armature 7 is attracted to one side, the trip transmission rod 3 also moves accordingly. At this time, due to the rotating shaft provided on the trip transmission rod 3, the direction of the horizontal linear motion is changed to the arc rotation direction. After the trip transmission rod 3 rotates, the other end pulls the trip plate 2 to cause the circuit breaker operating mechanism 1 to trip.

[0031] After tripping occurs, since the release in the circuit breaker operating mechanism 1 has tripped and the circuit breaker is powered off, at this time, when the magnetic force is 0, the reaction force of the yoke iron 5 is also 0. At this time, the tension spring 12 will naturally pull the armature 7 back to restore it to its natural state.

[0032] The above content further elaborates on the present utility model in combination with specific embodiments. It cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope determined by the claims submitted for the present utility model.

Claims

1. An electromagnetic tripping device for a circuit breaker, comprising a circuit breaker operating mechanism (1), a tripping transmission rod (3) and a bracket (6), characterized in that: On one side of the outer wall of the circuit breaker operating mechanism (1), a tripping pull plate (2) is provided, and one end of the tripping pull plate (2) extends backward to the rear end of the circuit breaker operating mechanism (1) and is movably connected to one end of a tripping transmission rod (3) to achieve the tripping function. The other end of the tripping transmission rod (3) is connected to an armature (7). A busbar (4) is installed inside the bracket (6), and the armature (7) moves inside the bracket (6).

2. The electromagnetic tripping device of a circuit breaker according to claim 1, characterized in that: A yoke iron (5) is provided between the inner wall of the bracket (6) and the busbar (4), and the bracket (6) is connected to the busbar (4) and the yoke iron (5) by fastening screws (11).

3. The electromagnetic tripping device of a circuit breaker according to claim 2, characterized in that: The yoke iron (5) is designed with a concave structure, and the outer wall of the yoke iron (5) fits with the inner wall of the bracket (6).

4. The electromagnetic tripping device of a circuit breaker according to claim 3, characterized in that: A sliding groove (8) is formed on the outer wall surface of the bracket (6).

5. The electromagnetic tripping device of a circuit breaker according to claim 1, characterized in that: On both sides of the outer wall of the armature (7), sliding blocks (10) are fixedly connected, and the sliding blocks (10) are horizontally slidably connected in the sliding groove (8). At both ends of the surface of the outer wall of the armature (7) far from the busbar (4), fixing rings (9) are fixedly connected.

6. The electromagnetic tripping device of a circuit breaker according to claim 5, characterized in that: A tension spring (12) is fixedly connected to the fixing ring (9).

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