Electromagnetic relay

Patent metadata

Field	Value
Publication number	US-10176952-B2
Application number	US-201515509914-A
Country	US
Kind code	B2
Filing date	Jul 27, 2015
Priority date	Dec 5, 2014
Publication date	Jan 8, 2019
Grant date	Jan 8, 2019

Abstract

Provided is an electromagnetic relay that is reduced in size and has great flexibility in designing. For this purpose, when a predetermined time has passed after generation of an arc at least either between a movable contact and a fixed contact or between a movable contact and a fixed contact, an arc generated between the movable contact and the fixed contact is extended by a magnetic field generation unit to be longer than an arc generated between the movable contact and the fixed contact.

First claim

The invention claimed is:

1. An electromagnetic relay, comprising:
a first movable contact and a second movable contact which are disposed on a movable contact piece;
a first fixed contact and a second fixed contact which are disposed so as to contactably and separably face the first movable contact and the second movable contact; and
a magnetic field generation unit that generates a first magnetic field having a first magnetic flux density to attract in a predetermined direction an arc generated between the first movable contact and the first fixed contact and that generates a second magnetic field having a second magnetic flux density to attract in a predetermined direction an arc generated between the second movable contact and the second fixed contact,
wherein, the first magnetic flux density between the first movable contact and the first fixed contact is larger than the second magnetic flux density between the second movable contact and the second fixed contact.

2. The electromagnetic relay according to claim 1 , wherein the arc generated between the first movable contact and the first fixed contact is attracted and extended to an arc extinguishing space that is disposed in a direction that, as seen from the first movable contact or the first fixed contact, is opposite to the facing first fixed contact or the facing first movable contact.

3. The electromagnetic relay according to claim 1 , wherein
the magnetic field generation unit comprises a first magnet that generates the first magnetic field having the first magnetic flux density and a second magnet that generates the second magnetic field having the second magnetic flux density.

Assignees

• Omron Tateisi Electronics Co

Inventors

• Itoda Syuichi
• Noda Masayuki
• Takami Koji
• Nishida Takeshi
• Hayashida Yasuo
• Yano Keisuke
• Miyake Ayaka

Classifications

• H01H50/60

  moving contact being rigidly combined with movable part of magnetic circuit {(for polarised relays H01H51/2254, H01H51/2281)} · CPC title

• H01H50/42

  Auxiliary magnetic circuits, e.g. for maintaining armature in, or returning armature to, position of rest, for damping or accelerating movement · CPC title

• H01H50/58

  Driving arrangements structurally associated therewith; Mounting of driving arrangements on armature · CPC title

• H01H2235/01

  Spiral spring · CPC title

• H01H50/38 Primary

  Part of main magnetic circuit shaped to suppress arcing between the contacts of the relay · CPC title