High voltage relay resistant to instantaneous high-current impact

Abstract

A high voltage relay resistant to instantaneous high-current impact is disclosed, and includes an electromagnet system, a control system, a contact system, and a base support. In the present solution, an electromagnetic force generated by the contact system is used to resolve a problem of contact separation caused by an electric repulsion force generated by an instantaneous high-current.

Claims

1. A high voltage relay resistant to instantaneous high-current impact, comprising: an electromagnet system, a control system, a contact system, and a base support, wherein the electromagnet system is connected to the control system, and the electromagnet system is configured to generate a magnetic field to provide a driving force for the control system; the control system is connected to the contact system, and the control system is configured to control contacts in the contact system to open and close; and the contact system generates an electromagnetic force when an instantaneous high current passes the high voltage relay, to offset an electric repulsion force between the contacts; wherein the contact system comprises a current inflow plate, a movable copper plate, a connecting piece, a current outflow plate, a movable contact, and a static contact; the current inflow plate and the current outflow plate are fastened on the base support; the movable contact is fastened on the movable copper plate, and the static contact is fastened on the current outflow plate; and the connecting piece is riveted or welded onto the current inflow plate and the movable copper plate; and wherein the connecting piece is a soft connecting piece.

2. The high voltage relay according to claim 1, wherein the current inflow plate and the movable copper plate generate a magnetic field through interaction when an instantaneous high current passes the high voltage relay, so that the movable copper plate generates an electromagnetic force in a direction opposite to that of the electric repulsion force between the contacts.

3. The high voltage relay according to claim 1, wherein an overtravel is set between the movable contact and the static contact.

4. The high voltage relay according to claim 1, wherein: the electromagnet system comprises a magnetic yoke, a coil framework, a movable iron core, and a static iron core; the coil framework is fastened on outer sides of the movable iron core and the static iron core; and the magnetic yoke is wrapped around the least four sides of the movable iron core, the static iron core, and the coil framework to form a magnetic circuit.

5. The high voltage relay according to claim 4, wherein the movable iron core and the static iron core are annular and hollow, are made of a magnetic material, and have a fixed air gap.

6. The high voltage relay according to claim 4, wherein the movable iron core drives a transmission shaft to move after the high voltage relay is energized, so that a movable contact support and the movable copper plate move toward a direction of closing the contacts.

7. The high voltage relay according to claim 1, wherein: the control system comprises a transmission shaft, a contact spring, a retractile spring, a movable contact support, and a circular hole; the contact spring and the retractile spring are wound around the transmission shaft, and the transmission shaft passes through the movable contact support, and is connected to the movable contact support by using a jump ring; and the circular hole is provided in the middle of the movable contact support.

8. The high voltage relay according to claim 7, wherein the contact spring is configured to provide contact pressure between the movable contact and the static contact.

9. The high voltage relay according to claim 7, wherein the retractile spring is configured to drive the movable contact support, by using the transmission shaft, to separate the movable contact from the static contact.

10. The high voltage relay according to claim 2, wherein the movable iron core drives a transmission shaft to move after the high voltage relay is energized, so that a movable contact support and the movable copper plate move toward a direction of closing the contacts.

11. The high voltage relay according to claim 3, wherein the movable iron core drives a transmission shaft to move after the high voltage relay is energized, so that a movable contact support and the movable copper plate move toward a direction of closing the contacts.

12. The high voltage relay according to claim 4, wherein the movable iron core drives a transmission shaft to move after the high voltage relay is energized, so that a movable contact support and the movable copper plate move toward a direction of closing the contacts.

13. The high voltage relay according to claim 5, wherein the movable iron core drives a transmission shaft to move after the high voltage relay is energized, so that a movable contact support and the movable copper plate move toward a direction of closing the contacts.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1 is a schematic structural diagram of a high voltage relay resistant to instantaneous high-current impact in an embodiment;

(2) FIG. 2 is a schematic diagram of closed contacts in a contact system in FIG. 1; and

(3) FIG. 3 is a schematic structural diagram of the movable copper plate and the movable contact support shown in FIG. 1.

DESCRIPTION OF EMBODIMENTS

(4) The following describes the technical solutions of the present disclosure in detail with reference to the accompanying drawings and the embodiments.

(5) FIG. 1 shows a high voltage relay resistant to instantaneous high-current impact in an embodiment, including an electromagnet system, a control system, and a contact system. The electromagnet system includes a magnetic yoke 1, a coil framework 2, a coil (not shown in the figure), a movable iron core 9, and a static iron core 10. The control system includes a base support 3, a transmission shaft 8, a contact spring 11, a retractile spring 12, and a movable contact support 15. The contact system includes a current inflow plate 4, a movable copper plate 5, a connecting piece 6, a current outflow plate 7, a movable contact 13, and a static contact 14. In this embodiment, the transmission shaft 8 is wound with the contact spring 11 and the retractile spring 12, and sequentially passes through the movable iron core 9 and the static iron core 10. Preferably, the movable iron core 9 and the static iron core 10 are annular and hollow, are made of a permeability magnetic material, and have a fixed air gap. The transmission shaft 8 further passes through the movable contact support 15 and is connected to the movable contact support 15 by using a jump ring. A surface of the coil framework 2 is covered with an insulation layer, and is fastened on outer sides of the iron core 9 and the static iron core 10. The magnetic yoke 1 is wrapped around the upper, lower, left, and right sides of the movable iron core 9, the static iron core 10, and the coil framework 2 to form a magnetic circuit. The current inflow plate 4 and the current outflow plate 7 are both fastened on the base support 3. The movable copper plate 5 is fastened on the movable contact support 15. The movable contact 13 is fastened on the movable copper plate 5. The static contact 14 is fastened on the current outflow plate 7. The current inflow plate 4 and the movable copper plate 5 are connected through a soft connecting piece 6 (e.g., a copper soft connecting piece or an aluminum soft connecting piece). One end of the soft connecting piece 6 is welded or riveted onto the current inflow plate 4, and the other end is welded or riveted onto the movable copper plate 5.

(6) In the foregoing structure, after the coil is energized, the movable iron core 9 moves, under an action of a magnetic field generated by the coil, toward a direction of narrowing the air gap. The movable iron core 9 drives the transmission shaft 8, to enable the movable contact support 15, the movable copper plate 5 fastened on the movable contact support 15, and the current inflow plate 4 to move toward a direction of closing the contacts. The moving direction is a normal direction of a contact section. In the moving process, the transmission shaft 8 is controlled by the coil and the movable iron core 9 to push the movable contact support 15. At the same time, the contact spring 11 and the retractile spring 12 are compressed. The contact spring 11 exerts pressure to the movable contact support 15, so that the movable contact 13 and the static contact 14 are in reliable contact. After the movable contact 13 and the static contact 14 are closed, the contact spring 11 provides proper contact pressure. As shown in FIG. 2, the contacts can be stably closed. To ensure a life of the contacts, a specific overtravel is set between the movable contact 13 and the static contact 14. In addition, to further ensure that the movable contact 13 and the static contact 14 are in reliable contact, a circular hole 16 is provided in the middle of the movable contact support 15. As shown in FIG. 3, the circular hole is used to fine-tune the movable contact support 15 within a relatively small range, thereby facilitating good contact between the movable contact 13 and the static contact 14.

(7) After the coil is energized, an instantaneous high current may pass the high voltage relay. In this case, a current in the current inflow plate 4 and a current in the movable copper plate 5 are in opposite directions and interact with each other to generate a magnetic field. The movable copper plate 5 generates an electromagnetic force under an action of the magnetic field. In other words, the electromagnetic force and an electric repulsion force between the contacts are in opposite directions. The electromagnetic force is exerted on the movable contact 13 and the static contact 14 by using the movable contact support 15, thereby avoiding deformation of the movable copper plate 5. In this embodiment, a length and an installation manner of the movable copper plate 5 are properly set, so that the generated electromagnetic force completely offsets the electric repulsion force between the contacts.

(8) After the coil is de-energized, under an action of the retractile spring 12, the transmission shaft 8 drives the movable contact support 15 to rapidly separate the movable contact 13 from the static contact 14, thereby implementing rapid breaking. To extinguish an electric arc as quickly as possible, in this embodiment, a permanent magnet is disposed on two sides of a contact area to blow the electric arc out, so that the electric arc is rapidly stretched and extinguished.

(9) The control system designed in this embodiment can well control contact between the movable contact and the static contact when the relay is energized, and can effectively ensure the life of the contacts by setting the overtravel between the contacts. When the relay encounters instantaneous high-current impact, the contact system uses the generated magnetic field to offset the electric repulsion force between the movable contact and the static contact, to avoid deformation of an internal apparatus of the relay. After the relay is de-energized, the control system drives the movable contact and the static contact to implement rapid breaking.

(10) Although the present disclosure has been disclosed above with examples of various embodiments, the present disclosure is not intended to limit the scope of the claims recited herein. Any person skilled in the art may, without departing from the scope of the present disclosure, make some conceptions or modifications to equivalent variations by using the foregoing disclosed technical content, however, any amendments, equivalent variations, and modifications that are made to the foregoing embodiments according to the technical essence of the present disclosure without departing from the content of the present disclosure still fall within the scope of the technical solutions of the present disclosure.