JPH05282983A - Electromagnetic relay - Google Patents

Abstract

PURPOSE:To prevent an electro motive force from being generated in a coil even when an electric current is interrupted by contacts. CONSTITUTION:A coil 1 is wound on the barrel part 11a of a coil frame 11. One end part 2a of an armature 2 is rotatably held by the internal hole of the barrel part 11a and the other end part 2b thereof is attracted or released by a yoke 12. A switch part 3 is provided on the opposite side to the coil 1 with respect to the collar part 11c of the coil frame 11 with a fixed contact piece 31 composed of a long conductive member and a normally closed contact spring 32 and a normally opened contact spring 33 formed into one body and actuated by the armature 2 so as to be opened and closed. Therefore, a relatively large current is interrupted by contacts provided on the conductive member and a magnetic flux generated around the current flowing through the conductive member of the switch part 3 is not interlinked with the coil 1, whereby an electro motive force is prevented from being generated in the coil 1 even when the magnetic flux is abruptly changed at every time of interruption.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to electromagnetic relays.

[0002]

2. Description of the Related Art As a conventional electromagnetic relay, a switch having a coil, an armature operated by excitation of the coil, and a long movable contact spring (conductive member) provided with a contact for opening and closing a current in response to the armature. And a coil and a movable contact spring are arranged side by side in parallel with each other.

[0003]

In the above-mentioned conventional electromagnetic relay, since the coil and the movable contact spring are arranged in parallel, the magnetic flux generated around the current flowing through the movable contact spring is generated by the coil. Will be linked. Therefore, when a relatively large current is opened and closed by the contact provided on the movable contact spring, the magnetic flux that links the coil also becomes relatively large, and the flux linkage changes rapidly each time the current is opened and closed. Therefore, an electromotive force is generated in the coil, which causes noise, which may cause an electronic component or the like connected with the coil to malfunction.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an electromagnetic relay which does not generate an electromotive force in a coil by opening and closing a current at a contact.

[0005]

In order to solve the above-mentioned problems, the electromagnetic relay of the present invention is provided with a coil, an armature that operates by exciting the coil, and a contact that opens and closes a current in response to the armature. In an electromagnetic relay provided with a switch section having a long conductive member, a coil is arranged at a position other than a space surrounding the conductive member as a longitudinal direction.

[0006]

According to the electromagnetic relay of the present invention, since the coil is disposed at a position other than the space surrounding the longitudinal direction of the conductive member, the magnetic flux generated around the current flowing through the conductive member is Therefore, even if the magnetic flux is suddenly changed by opening and closing a relatively large current with the contact provided on the conductive member, the coil does not interlink.
No electromotive force is generated in the coil.

[0007]

An embodiment of the present invention will be described below with reference to FIG.

Reference numeral 1 denotes a coil, which is wound around the winding barrel portion 11a of the coil frame 11. The coil frame 11 has flange portions 11b and 11c at both ends of the winding barrel portion 11a, and the coil 1 is connected to a coil terminal 11d provided on the one flange portion 11b. Then, the substantially U-shaped yoke 12 has its one facing piece 12a and one flange portion 11b.
The other facing piece 12b is disposed outside the other side so as to pass through the inside of the other flange portion 11c, respectively.

2 is an armature, which is formed in a flat plate shape,
While being inserted into the inner hole of the winding barrel portion 11a of the coil frame 11,
One end 2a is rotatably supported by one end of one facing piece 12a of the yoke 12, and the other end 2b is yoked by the excitation of the coil 1.
It is adapted to be sucked by the end face of the other facing piece 12b of the twelve. A return spring 2c is locked to one end 2a of the armature 2 so that the armature 2 is released from the yoke 12 when the coil 1 is de-energized.

Reference numeral 3 denotes a switch portion, in which a fixed contact piece 31, which is an elongated conductive member, a normally closed contact spring 32, and a normally open contact spring 33 are integrally formed on a molded body 34. The fixed contact piece 31 has fixed contacts 31a and 31b fixed to both surfaces of one end, and the other end bent into an L shape inside the molded body 34 is led out from the molded body 34 as an external connection terminal 31c. There is. The normally closed contact spring 32 is parallel to the fixed contact piece 31 and is fixed to one end of the normally closed contact 32a.
The other end portion is fixedly provided to the external connection terminal 32b led out from the molded body 34 so as to contact the one fixed contact 31a. The normally open contact spring 33 is parallel to the fixed contact piece 31 on the side opposite to the normally closed contact spring 32, and the normally open contact 33a fixed to one end contacts the other fixed contact 31b. The other end is fixed to the external connection terminal 33b led out from the 34.

In the switch portion 3, the longitudinal direction thereof, that is, the lengthwise direction of the fixed contact piece 31 is the axial direction of the coil 1, and the switch portion 3 is located on the side opposite to the coil 1 with respect to the other flange portion 11c of the coil frame 11. It is installed in. In other words, the coil 1 has a space other than the space surrounded by the longitudinal direction of the long conductive member (fixed contact piece 31, normally closed contact spring 32, normally open contact spring 33) of the switch section 3 as an axis. Will be arranged at the position.

More specifically, a base piece 11e is formed so as to extend from the other flange portion 11c of the coil frame 11 toward the outer side in the axial direction of the coil 1. The base piece 11e is formed in the longitudinal direction of the fixed contact piece 31. The molded body 34 is mounted on the base piece 11e through the external connection terminals 31c, 32b, and 33b so that they are parallel to each other.
An insulating drive piece 2d fixed to the tip of the other end portion 2b of 2 is inserted between one end portions of the normally closed contact spring 32 and the normally open contact spring 33. Then, as shown in the figure, when the other end 2b of the armature 2 is released from the end face of the other facing piece 12b of the yoke 12, the driving piece 2d pushes up the normally open contact spring 33 to make the normally open contact 33a a fixed contact. While being separated from 31b, the normally-closed contact 32a separates from the normally-closed contact spring 32 and is in contact with the fixed contact 31a with a predetermined contact pressure.

The sheet-shaped base 13 is a coil frame.
A box-shaped case 14 fitted along the base piece 11e of 11 and fitted to the base 13 is attached.

Next, the operation will be described. Coil in the state shown
When 1 is excited, the other end 2b of armature 2
On the other hand, by being attracted to the end surface of the opposite piece 12b, the driving piece 2d presses the normally closed contact spring 32 to separate the normally closed contact 32a from the fixed contact 31a and away from the normally open contact spring 33. The open contact 33a comes into contact with the fixed contact 31b with a predetermined contact pressure. When the coil 1 is de-energized, the state shown in the figure is restored. In this way, the switch unit 3 responds to the armature 2 to open and close the current by the normally closed contact 32a and the normally open contact 33a coming into contact with and separating from the fixed contacts 31a and 31b, respectively.

In such an electromagnetic relay, the coil 1
Is a long conductive member (fixed contact piece 31,
Since the normally-closed contact spring 32 and the normally-open contact spring 33) are arranged at positions other than the space surrounding the longitudinal direction as an axis, the magnetic flux generated around the current flowing through the conductive member links the coils. Therefore, even if the magnetic flux is suddenly changed by opening and closing a relatively large current with a contact provided on the conductive member, electromotive force is not generated in the coil 1, As a result, the electronic parts connected together with the coil 1 will not malfunction.

Further, since the coil 1 and the switch portion 3 are arranged at positions opposite to each other with respect to the other flange portion 11c of the coil frame 11, insulation between the coil 1 and the switch portion 3 is provided. It is easy to secure, and high withstand voltage can be obtained.

In this embodiment, although the coil 1 is arranged at a position other than the space surrounding the long conductive member of the switch section 3 with respect to the longitudinal direction as an axis, the switch section 3 has a long length. Direction, that is, the lengthwise direction of the fixed contact piece 31 is the axial direction of the coil 1, and the coil is positioned with respect to the other flange portion 11c of the coil frame 11.
Although it is arranged at the position opposite to 1, the long direction of the fixed contact piece 31 is perpendicular to the axis of the coil 1, and
It may be arranged at a position outside the one winding surface.

[0018]

In the electromagnetic relay of the present invention, since the coil is arranged at a position other than the space surrounding the conductive member in the longitudinal direction as an axis, the coil is generated around the current flowing through the conductive member. The magnetic flux that does not cross the coil does not cause electromotive force to the coil even if the magnetic flux is suddenly changed by opening and closing a relatively large current with the contacts provided on the conductive member. Does not occur, and eventually, the electronic components connected together with the coil do not malfunction.

[Brief description of drawings]

FIG. 1 is a sectional front view showing an embodiment of the present invention.

[Explanation of symbols]

 1 Coil 2 Armature 3 Switch part 31 Fixed contact piece (conductive member) 32 Normally closed contact spring (conductive member) 33 Normally open contact spring (conductive member)

Claims (1)

[Claims] 1. An electromagnetic relay comprising: a coil; an armature which operates by exciting the coil; and a switch section having an elongated conductive member having a contact for opening and closing a current in response to the armature, the electromagnetic relay comprising: The electromagnetic relay is characterized in that the electromagnetic relay is arranged at a position other than the space surrounding the conductive member as an axis in the longitudinal direction.