CN213660327U

CN213660327U - Direct current breaker capable of quickly tripping

Info

Publication number: CN213660327U
Application number: CN202023074107.0U
Authority: CN
Inventors: 王义明; 章圣江
Original assignee: Zhejiang Changchun Electric Appliance Co ltd
Current assignee: Zhejiang Changchun Electric Appliance Co ltd
Priority date: 2020-12-18
Filing date: 2020-12-18
Publication date: 2021-07-09
Anticipated expiration: 2030-12-18

Abstract

The utility model discloses a direct current breaker capable of quickly tripping, which comprises an arc extinguishing chamber, an upper busbar and a lower busbar, wherein the upper busbar is electrically connected with the arc extinguishing chamber, the lower busbar is provided with a first section and a second section which are vertically connected with each other, the first section is vertically arranged and is electrically connected with the arc extinguishing chamber, the second section is arranged below the upper busbar in parallel, a moving contact is vertically arranged on the second section, a closing mechanism is arranged on one side of the upper busbar opposite to the moving contact, and a tripping mechanism is arranged on one side of the moving contact facing the upper busbar; the tripping mechanism is provided with a tripping rod adopting a lever principle, and the tripping rod pushes and presses an elastic rod in the closing mechanism when the main circuit is overloaded so as to trip a push rod which enters a locking groove of the elastic rod, thereby ensuring the quick response of the direct current circuit breaker when the main circuit is overloaded or short-circuited.

Description

Direct current breaker capable of quickly tripping

Technical Field

The utility model relates to a direct current breaker, especially a direct current breaker that can thread off fast.

Background

The direct current circuit breaker is used in a direct current circuit and used for protecting a short circuit and overload of a main circuit of a traction system of an electric locomotive of a subway, a light rail, an electric car and an industrial and mining. It can also be used in silicon rectifier devices, silicon controlled rectifier devices, and protective switches in steel rolling, mining, and chemical engineering, and can also be used in grading protective circuit breakers of small DC feeder devices. A dc circuit breaker generally includes an arc extinguishing chamber, an upper bus bar, a lower bus bar, a closing mechanism, and a tripping mechanism. The tripping mechanism is used for disconnecting the circuit breaker when the main circuit is in short circuit or overload. The existing tripping mechanism still uses a winch structure, the tripping mode is flexible and has slow response speed, and the situation that the main circuit is not tripped timely when overloaded easily occurs.

SUMMERY OF THE UTILITY MODEL

In view of the above, the utility model aims to provide a direct current circuit breaker that can trip fast can realize the quick dropout when main circuit transships or the short circuit, and then guarantees the safe operation of main circuit.

In order to achieve the above purpose, the technical scheme of the utility model is that:

a direct current breaker capable of quickly tripping comprises an arc-extinguishing shield, an upper busbar and a lower busbar, wherein the upper busbar is electrically connected with the arc-extinguishing shield, the lower busbar is provided with a first section and a second section which are vertically connected with each other, the first section is longitudinally arranged and electrically connected with the arc-extinguishing shield, the second section is arranged below the upper busbar in parallel, a moving contact is longitudinally arranged on the second section, a switching-on mechanism is arranged on one side of the moving contact, which is back to the upper busbar, and a tripping mechanism is arranged on one side of the moving contact, which faces the upper busbar;

the closing mechanism comprises a push rod capable of pushing the moving contact to the upper bus bar, the push rod is fixedly connected with a connecting rod which is longitudinally arranged, a shaft sleeve which is hinged with the second section is arranged on the second section, the connecting rod is slidably inserted into the shaft sleeve, and a first spring which applies downward pulling force to the push rod is sleeved on the connecting rod; an elastic rod is arranged below the push rod and abutted against the push rod, a locking groove for embedding the push rod is formed in the upper part of the elastic rod, one end, far away from the moving contact, of the elastic rod is connected with a moving iron core, one side of the moving iron core is provided with an electromagnet capable of attracting the moving iron core to move towards the second section, and a reset spring is further arranged on the elastic rod;

the tripping mechanism comprises a static induction electromagnet arranged below the second section and an dynamic induction electromagnet arranged above the second section, induction magnetic fields generated by the static induction electromagnet and the dynamic induction electromagnet are opposite in the same level, one end of a tripping rod hinged with the dynamic induction electromagnet is arranged above the dynamic induction electromagnet, and the other end of the tripping rod can be abutted to the end part of the elastic rod in a downward overturning manner.

Furthermore, the lower part of the electromagnet is horizontally arranged on a fork-shaped rod hinged to the shaft sleeve, the fork-shaped rod is inserted into the auxiliary contact in a sliding fit mode, a contact piece is further arranged on the fork-shaped rod, when the elastic rod is driven by the movable iron core to extend out, the fork-shaped rod drives the contact piece to be in contact with the auxiliary contact, and the auxiliary contact is electrically connected with the signal lamp.

Further, a second spring for supporting the elastic rod is hinged below the elastic rod.

The working principle is as follows: when the main circuit needs to be started, the electromagnet is electrified to generate magnetism, the movable iron core is immediately attracted to overcome the action of the reset spring and extend into the elastic rod, the push rod is immediately embedded into the locking groove on the elastic rod and moves forward along with the elastic rod, the movable contact is pushed to be elastically bent in the advancing process of the push rod, so that the movable contact is contacted with the upper bus bar, and the upper bus bar and the lower bus bar are immediately connected to conduct the main circuit. At the moment, the static induction electromagnet and the dynamic induction electromagnet positioned at the upper side and the lower side of the second section respectively generate induction magnetic fields, the dynamic induction electromagnet rises due to the repulsion of the homopolarity of the magnetic pole, the trip rod is immediately driven to rotate, and one end of the trip rod is abutted against the elastic rod to achieve a balanced state. And when the main circuit transships or the short circuit, then the current increase through lower busbar this moment, the induced magnetic field vibration of dynamic response electromagnet and static response electromagnet is strong, dynamic response electromagnet continues to rise, and then make the trip bar continue to overturn and push up the flexible rod bending, after the flexible rod bending to a certain degree, push rod and locked groove dropout (push rod roll-off locked groove), the flexible rod reached loses the constraint to the push rod, the push rod can not produce the effort to the crooked moving contact of elasticity, the moving contact is replied to initial condition, namely main circuit disconnection. In addition, when the main circuit needs to be conducted again, the electromagnet needs to be powered off and restarted.

Has the advantages that: the direct current breaker is simple in structure and can respond to overload and short circuit phenomena of the main circuit. Therefore, corresponding quick tripping is realized, and the safety of the circuit is effectively ensured.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Reference numerals: 100, arc chute 200, upper bus bar 300, lower bus bar 310, first segment 320, second segment 400, movable contact 500, closing mechanism 510, push rod 520, link 530, bushing 540, first spring 550, elastic rod 551, locking slot 560, movable iron core 570, electromagnet 580, return spring 600, tripping mechanism 610, static induction electromagnet 620, dynamic induction electromagnet 630, tripping rod 700, forked rod 710, contact 800, contact 900, and second spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The direct current circuit breaker capable of quick tripping shown in fig. 1 comprises an arc extinguishing chamber 100, an upper bus bar 200 and a lower bus bar 300. Wherein, the upper bus bar is electrically connected with the arc extinguishing chamber. And the lower bus bar has a first section 310 and a second section 320. The first section is longitudinally arranged and electrically connected with the arc extinguishing cover, and the second section is horizontally arranged below the upper bus bar and electrically connected with the first section. And a movable contact 400 having an elastic deformation capability is longitudinally disposed on the second end. A closing mechanism 500 is provided on the side of the moving contact opposite to the upper bus bar to push the moving contact to the upper bus bar to conduct the moving contact and a releasing mechanism 600 is provided on the side of the moving contact facing the upper bus bar to release the moving contact from contact with the upper bus bar.

Specifically, the closing mechanism includes a push rod 510 for pushing the movable contact and elastically bending the movable contact toward one side of the upper bus bar, one end of the push rod is fixedly connected with a longitudinally arranged connecting rod 520, and in addition, a shaft sleeve 530 hinged to the rod is arranged on the second section, and the connecting rod is inserted into the shaft sleeve in a sliding fit manner. In addition, a first spring 540 for continuously applying a downward pulling force to the link is sleeved on the link. At the same time, an elastic rod 550 is provided below the push rod, and is in contact with the push rod, and the elastic rod is horizontally arranged and can move close to and away from the upper bus bar. It should be noted that, a locking groove 551 is provided on the upper portion of the elastic rod, and when the push rod enters the locking groove, the push rod will move synchronously with the locking groove. In order to drive the elastic rod to move, a movable iron core 560 is fixedly connected to one end of the elastic rod away from the movable contact. The closing mechanism further includes an electromagnet 570 that is energized to generate magnetism and attracts the movable core to move toward the movable contact side. And in order to make the closing mechanism reset after the utility model stops working, a reset spring 580 is also sleeved on the elastic rod. When the elastic rod moves towards the moving contact, the return spring is compressed.

The trip mechanism 600 includes a static induction electromagnet 610 disposed below the second section and a dynamic induction electromagnet 620 disposed above the second section. It should be noted that both the static induction electromagnet and the dynamic induction electromagnet generate magnetic fields by inducing currents in the lower bus bar, and the winding directions of the static induction electromagnet and the dynamic induction electromagnet are opposite to each other, so that the magnetic poles of the magnetic fields generated by the static induction electromagnet and the dynamic induction electromagnet are opposite to each other. That is, the dynamic induction electromagnet is repelled by the static induction electromagnet and is in a lifting state. As the current in the lower busbar increases, the distance between the static induction electromagnet and the dynamic induction electromagnet will continue to increase, i.e., the dynamic induction electromagnet will continue to rise. Meanwhile, a trip bar 630 with one end hinged with the dynamic induction magnet is arranged above the dynamic induction magnet, and the other end of the trip bar abuts against the end part of the elastic rod extending forwards. And the trip rod can be driven by the dynamic induction electromagnet to turn over so as to enable the end part of the elastic rod to be elastically bent.

As a further improvement of the above embodiment, whether the closing is in place can be observed more intuitively. A fork-shaped rod 700 is horizontally arranged below the electromagnet and is hinged with the shaft sleeve. The forked lever is slidably engaged in an auxiliary contact 800. At the same time, a contact piece 710 is provided on the fork lever. When the switch is closed in place, the fork-shaped rod is driven by the shaft sleeve to enable the contact piece to move to be in contact with the auxiliary contact. The auxiliary contact is now conductive. At this time, the signal lamp 900 electrically connected to the auxiliary contact is lighted to enable a worker to sense a signal.

As a further improvement of the above embodiment, in order to prevent the elastic bar from being bent due to long-term compression, a second spring 1000 is provided below the elastic bar, and is hinged to the elastic bar without affecting horizontal expansion and contraction of the elastic bar.

Claims

1. The utility model provides a can quick dropout direct current circuit breaker which characterized in that: the arc extinguishing device comprises an arc extinguishing shield, an upper bus bar and a lower bus bar, wherein the upper bus bar is electrically connected with the arc extinguishing shield, the lower bus bar is provided with a first section and a second section which are vertically connected with each other, the first section is longitudinally arranged and is electrically connected with the arc extinguishing shield, the second section is arranged below the upper bus bar in parallel, a moving contact is longitudinally arranged on the second section, a closing mechanism is arranged on one side of the moving contact, which is back to the upper bus bar, and a tripping mechanism is arranged on one side of the moving contact, which faces the upper bus bar;

2. The direct current circuit breaker capable of quick tripping of claim 1, wherein: the lower part of the electromagnet is horizontally arranged on a fork-shaped rod hinged to the shaft sleeve, the fork-shaped rod is inserted into the auxiliary contact in a sliding fit mode, a contact piece is further arranged on the fork-shaped rod, when the elastic rod is driven by the movable iron core to extend out, the fork-shaped rod drives the contact piece to be in contact with the auxiliary contact, and the auxiliary contact is electrically connected with a signal lamp.

3. The direct current circuit breaker capable of quick tripping of claim 1, wherein: and a second spring for supporting the elastic rod is hinged below the elastic rod.