Arc path forming unit and direct current relay comprising same

Abstract

An arc path forming unit and a direct current relay are disclosed. An arc path forming unit according to an embodiment of the present invention comprises: a magnet frame extending in a longitudinal direction; and a plurality of main magnet units disposed in the width direction of the magnet frame. The surfaces, which face each other, of the main magnet units have the same polarity. Therefore, magnetic fields that repel each other are generated in a space between the respective main magnet units. An electromagnetic force in the direction oriented toward the outside of the arc path forming unit is formed by means of the magnetic fields. Thus, a generated arc can move in the direction of the electromagnetic force so as to be stably extinguished. As a result, various members positioned in the center of the direct current relay are prevented from being damaged by the arc.

Description

TECHNICAL FIELD[0001]The present disclosure relates to an arc path forming unit and a direct current (DC) relay comprising the same, and more particularly, to an arc path forming unit having a structure capable of forming an arc discharge path using electromagnetic force and preventing damage on a DC relay, and a DC relay comprising the same.BACKGROUND ART[0002]A direct current (DC) relay is a device that transmits a mechanical driving signal or a current signal using the principle of an electromagnet. The DC relay is also called a magnetic switch and generally classified as an electrical circuit switching device.[0003]A DC relay includes a fixed contact and a movable contact. The fixed contact is electrically connected to an external power supply and a load. The fixed contact and the movable contact may be brought into contact with or spaced apart from each other.[0004]By the contact and separation between the fixed contact and the movable contact, electrical connection or disconne...

AI Technical Summary

Benefits of technology

The present patent is about a magnet frame structure that can produce magnetic fields that repel or attract each other, which results in a path for an arc (which is electricity) to flow away from the center of the magnet frame. This prevents damage to the central portion of a DC relay and ensures the generated arc does not move towards the center of the magnet frame. The technical effect of this structure is improved safety and protection against electromagnetic damage.

Problems solved by technology

Therefore, when an arc generated as illustrated in (b) of FIG. 1 is moved toward the central portion, there is a risk that various members provided at the position may be damaged by energy of the arc.

This may cause inconvenience to the use of the DC relay.

In addition, regardless of the user's intention, a situation in which a flowing direction of current applied to the DC relay is changed due to an inexperienced operation or the like cannot be excluded.

In this case, the members disposed in the central portion of the DC relay may be damaged by the generated arc.

This may be likely to reduce the lifespan of the DC relay and cause a safety accident.

The DC relay having the structure can prevent the movement of the movable contact by using the plurality of permanent magnets, but there is a limitation in that any method for controlling a direction of an arc discharge path is not considered.

That is, there is a limitation in that a method for forming a discharge path for an arc generated when the movable contact and the fixed contact are separated from each other is not introduced.Korean Registration Application No. 10-1696952 (Jan. 16, 2017)Korean Registration Application No. 10-1216824 (Dec. 28, 2012)

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