JPH0228206B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic relay in which a contact component is enclosed in a sealed container, and more particularly to an electromagnetic relay that performs a transfer operation.

The structure of a conventional electromagnetic relay of this kind will be explained with reference to FIG. 1. It has a neutral terminal 101 made of a substantially H-shaped conductor, and a neutral terminal 101 made of a soft magnetic conductor to which fixed contacts 102 and 103 are fixed, respectively. The first and second fixed contact terminals 104 and 105 have respective lead-out portions in an insulating casing 106 made of synthetic resin.
The neutral terminal 101 is fixed to an insulating casing 106 so as to protrude to the outside and the two fixed contact terminals 104 and 105 are arranged on both sides of the neutral terminal 101 . Furthermore, a thin plate-shaped movable contact spring made of a non-magnetic conductive material has an armature 107 made of a soft magnetic material and a movable contact 108 having a raised protrusion at the lower center that contributes to setting the fulcrum of the tilting movement and the contact gap. 109
A movable contact assembly in which both ends of the armature 107 are fixed to the fixed contact terminal 10 by welding, etc.
4, 105, and extends outward on both sides from near the center of the movable contact spring 109 so that the protrusion of the armature 107 comes into contact with the central flat part of the neutral terminal 101. The tip is fixed to the neutral terminal 101 by welding or the like. Further, the permanent magnets 110a and 110b are connected to the fixed contact terminal 104,
105 are placed near the top of these fixed contact terminals so that both are magnetized to the same polarity, and an upper housing (lid) 111 made of synthetic resin is fixed on the opening peripheral edge of the insulating housing 106. It airtightly accommodates the contact component members described above and constitutes a winding frame. An excitation winding 112 is wound around this,
It is connected to the coil terminal 113. The yoke 114 is fixed to the lower part of the insulating casing 106 and forms a magnetic flux path. Furthermore, a protective cover 115 is adhered to the outer periphery of the casings 106 and 111. The transfer type electromagnetic relay configured in this way has a permanent magnet 1
10a and 110b are fixed contact terminals 104 and 105
Since the permanent magnets 110a, 110b and the armature 107 are disposed outside the upper contact facing part, the magnetic gap between the permanent magnets 110a, 110b and the armature 107 is large, so that the magnetic flux from the permanent magnets 110a, 110b that generates magnetic attraction force on the armature 107 is effective. However, leakage magnetic flux is generated without reaching the armature 107, and a decrease in magnetic efficiency is inevitable. Furthermore, in order to compensate for the decrease in magnetic efficiency, it is necessary to increase the size of the magnet, resulting in problems such as an increase in the size of the relay.

An object of the present invention is to provide a transfer type electromagnetic relay that is compact and has excellent magnetic efficiency by arranging a permanent magnet directly under a fixed contact terminal and within the range of the contact facing portion.

A transfer type electromagnetic relay according to the present invention includes conductive first, second, and third terminals each having a lead-out portion that penetrates an insulating casing; a raised protrusion that abuts on the upper surface of the first terminal. an armature made of a magnetic material that selectively tilts into contact with the second and third terminals respectively disposed on both sides of the first terminal using the protrusion as a fulcrum; The second
and a movable contact spring portion having a movable contact member that selectively contacts a fixed contact member provided on a third terminal, and a movable arm that is electrically connected to the first terminal and supports tilting of the armature. a permanent magnet disposed near at least one of the second and third terminals and on the opposite side of the surface that contacts the armature; and a permanent magnet coupled on the housing. an insulating lid constituting an airtight container for airtightly accommodating the constituent members; the casing and the lid being wound together as a winding frame, and the movable contact member of the thin plate spring by tilting the armature; The present invention is characterized by comprising: an excitation winding that makes selective contact with each of the fixed contact members of the second and third terminals.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is a partially cutaway perspective view of one row of transfer type electromagnetic relays according to the present invention. Referring to the figure, a substantially H-shaped neutral terminal 201 made of a non-magnetic conductor, and first and second fixed contact terminals 202, 203 made of a soft magnetic conductor and having fixed contacts 204, 205 fixed thereto, Each drawer is connected to a lower insulating casing 20 made of synthetic resin.
The neutral terminal 201 is fixed to the lower insulating casing 206 so as to be pulled out to the outside of the neutral terminal 201 and the fixed contact terminals 202 and 203 are arranged on both sides of the neutral terminal 201. Furthermore, a thin plate-shaped movable contact spring made of a non-magnetic conductive material has an armature 207 made of a soft magnetic material and a movable contact 209 having a protrusion at the lower center thereof that contributes to setting the fulcrum of the tilting movement and the contact interval. 208
A movable contact assembly in which both ends of the armature 207 are fixed to each other by welding or the like is connected to the fixed contact terminal 20 at both ends of the armature 207.
2, 203, and extends from near the center of the movable contact spring 208 so that the protrusion of the armature 207 contacts the central flat part of the neutral terminal 201. is fixed to the neutral terminal 201 by welding or the like. Furthermore, the permanent magnets 210a, 210b are fixed contact terminals 202, 2
03 to the same polarity, these fixed contact terminals are arranged on the opposite side of the contact arrangement part, that is, directly under the opposing part of the fixed contact terminals 202, 203 and the armature 207. This arrangement allows
The length of fixed contact terminals required for conventional permanent magnet arrangement can be shortened. Along with this, permanent magnets 210a, 2
The magnetic resistance between the armature 10b and the armature 207 is reduced, the amount of effective magnetic flux can be increased, and the external size can also be reduced. Further, since the permanent magnets 210a and 210b approach the magnetic gap portion where the armature 207 and the fixed contact terminals 202 and 203 face each other, leakage magnetic flux is reduced and magnetic efficiency can be improved, so that the permanent magnets can be made smaller. Note that by fixing the upper insulating casing (lid) 211 made of synthetic resin onto the open peripheral edge of the lower insulating casing 206, the above-mentioned contact components are accommodated airtightly, and the winding frame is Configure. An excitation winding 212 is wound around this.
Furthermore, a yoke 2 is provided on the upper part of the upper insulating housing 211.
13 is attached to form a magnetic flux path. lastly,
A protective cover 214 is attached to the relay body to complete the transfer type electromagnetic relay.

Although the relay of the above-described embodiment is a double-contact switching self-holding type relay using two permanent magnets, it can be changed to a monostable self-holding type by omitting one of the permanent magnets.

As explained above, according to the present invention, a transfer type electromagnetic relay that is small and has excellent magnetic efficiency can be obtained by arranging the permanent magnet on the opposite side of the fixed contact terminal surface to the side that is in contact with the armature.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing an example of a conventional transfer type electromagnetic relay, and FIG. 2 is a partially cutaway perspective view showing an embodiment of the transfer type electromagnetic relay according to the present invention. 201... Neutral terminal, 202, 203... First
and second fixed contact terminal, 204, 205... fixed contact, 206... lower insulating casing, 207... armature, 208... movable contact spring, 209... movable contact, 210a, 210b... permanent magnet , 211
... Upper insulating casing, 212 ... Excitation winding, 213
...Yoke, 214...Cover.

Claims (1)

[Claims] 1 Conductive first, second, and third terminals each having a lead-out portion that penetrates the insulating casing; having a protrusion that abuts the top surface of the first terminal, and using this protrusion as a fulcrum. an armature made of a magnetic material that makes selective tilting contact with the second and third terminals disposed on both sides of the first terminal; a movable contact spring portion having a movable contact member that is driven and selectively contacts fixed contact members provided on the second and third terminals; a conductive thin plate spring having a movable arm that supports tilting; a permanent magnet disposed in the vicinity of at least one of the second and third terminals and on the opposite side of contact with the armature; the casing; an insulating lid that is combined with the top to form an airtight container that airtightly accommodates the constituent members; the housing and the lid are wound as a winding frame, and the thin plate spring is wound by tilting the armature; A transfer type electromagnetic relay comprising: an excitation winding that performs a switching operation between the movable contact member and the fixed contact members of the second and third terminals.