JPS6355829A - Electromagnetic relay - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field] The present invention operates by energizing or demagnetizing a coil of an N magnet device to operate or displace a movable iron piece to a normal position, and to respond to the displacement operation of the movable iron piece. Fixed.

This invention relates to an electromagnetic relay that connects and disconnects (opens and closes) both movable contacts.

[Background Art] This type of electromagnetic relay is generally shown in FIG. In the figure, 1 is a fixed contact, 2 is a fixed contact plate with a relatively large spring constant, 3 is a movable contact, and 4 is a movable contact plate with a relatively small spring constant.

Reference numeral 5 denotes an electromagnetic device, which includes a yoke 6, an iron core 7, a coil 8, a movable iron piece 9, a return spring 10, and the like. Reference numeral 11 denotes a card made of an insulating material such as plastic, which is fitted into the movable iron piece 9 and has a tip. is engaged with the movable contact plate 4. Each of these members is housed in a housing 2 constituted by a cover (not shown) and a base 13. Then, the movable iron piece 9 is activated by excitation or demagnetization of the coil 8. The movable contact plate 4 responds to the movable iron piece 9 via the card 11, and both contacts 1.3 move toward and away from each other.

When observing the contact (closing) operation of such an electromagnetic relay in detail, bounce occurs between both contacts 1.3. That is,
When the coil 8 is excited and the movable iron piece 9 is displaced to the operating position, the movable contact plate 4 is suddenly pressed toward the fixed contact plate 2 through the card 11, and the movable contact 3 collides with the fixed contact 1. Therefore, the fixed contact plate 2 receives the energy of the collision, bends in the direction of the collision, and both contacts 1.3 open, and then the fixed contact plate 2 returns and the movable contact plate 4 is further pressed, so that both contacts 1.3 comes into contact. If the energy of the collision is large, this kind of collision, separation,
The so-called bounce causes an arc between the two contacts 1.3, which damages the contacts and shortens their service life.

[Object of the Invention] The present invention was made in view of the above reasons, and its purpose is to reduce the /< lance between fixed and movable contacts, thereby extending the life of the contacts. Provides relays.

[Disclosure of the Invention] The electromagnetic relay of the present invention includes a fixed contact, a fixed contact plate provided with the fixed contact, a movable contact plate provided with a movable contact that contacts and separates from the fixed contact, a yoke, an iron core, a coil, and a movable iron piece. and an electromagnetic device in which the movable iron piece is actuated or displaced to the normal position by excitation or demagnetization of the coil, respectively, and these are housed in a housing, and the movable contact plate responds to the movable iron piece so that both contacts are connected and separated. The operating electromagnetic relay is characterized in that a buffer made of a viscoelastic material is provided between the fixed contact plate and the housing to absorb the energy of the collision received by the fixed contact plate during contact operation.

According to the present invention, the energy of the collision received by the fixed contact plate during the contact contact operation is absorbed by the buffer, so that the fixed contact plate
Bounce between both movable contacts can be significantly reduced, thereby extending the life of the contacts.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2. Note that substantially the same members as in the general example described above are given the same reference numerals.

The housing 12 is composed of an insulating base 13 and a box-shaped cover 14. On the base 13, there are fixed contact terminals 15, movable contact terminals 16, and coil terminals 17 and 17 of the electromagnetic device.
is penetrated and fixed. Also, the base 1 inside the housing 12
3, the base end of the fixed contact plate 2, the base end of the movable contact plate 4, and the horizontal piece of the yoke 6 of the electromagnet device are fixed. Each contact plate 2.4 faces approximately parallel, and the fixed contact plate 2 faces outward (
The cover 14 is located on the opposite side of the electromagnet device, and is arranged such that a small gap is interposed between the cover 14 and the inner wall surface of the cover 14. Each contact plate 2.4 and each contact terminal 15.1, 6 may be formed integrally.

The fixed contact plate 2 is formed of a conductive spring material with a relatively large spring constant, and the fixed contact 1 is provided at the tip. The movable contact plate 4 is formed of a conductive spring material with a relatively small spring constant, and is provided with a movable contact 3 that contacts and separates from the fixed contact 1 at its tip.

The electromagnet device 5 has an L-shaped yoke 6, a cylindrical iron core 7 fixed to a horizontal piece of the yoke 6, and a coil 8 wound around the outer periphery of the iron core 7, and has an angle slightly larger than a right angle. L
A movable iron piece 9 is shaped like a letter and is supported at one vertical end of the yoke 6 so as to be angularly displaceable so that the armature face faces the end face of the iron core 7.
and a return spring 10 that biases the movable iron piece 9 in a direction away from the end face of the iron core 7. The movable iron piece 9 is a coil 8
When it is demagnetized, it is in the normal position due to the spring force of the return spring 10', and when it is energized, it is displaced to the operating position where it is attracted to the end face of the iron core 7 against the spring force of the return spring 10.

The card 11 is made of an insulating material such as plastic so that the base end 11a is fitted into the movable iron piece 9 and the distal end 11b is engaged with the middle part of the movable contact plate 4. Therefore, when the movable iron piece 9 is moved to the activated or normal position by excitation or demagnetization of the coil 8 of the electromagnetic device 5, the movable contact plate 4 responds via the card 11, and both contacts 1.
3 performs contact M (opening/closing) operation.

Reference numeral 21 denotes a buffer body formed into a rectangular plate shape from a viscoelastic material that absorbs impact, such as butyl rubber, and is provided by adhesive or the like on the outer surface of the tip of the fixed contact plate 2 so as to overlap with the fixed contact 1. The thickness of the buffer body 21 is approximately equal to the small gap between the fixed contact plate 2 and the inner wall surface of the cover 14 of the housing 12. Note that the buffer 21 may be provided on the cover 14.

In such an electromagnetic relay, bounce between the contacts 1 and 3 during the contact (closing) operation can be significantly reduced.

That is, when the coil 8 is excited and the movable iron piece 9 is displaced to the operating position, the movable contact plate 4 is suddenly pressed toward the fixed contact plate 2 via the card 11, causing the movable contact 3 to move to the fixed contact 1.
collide with

Therefore, the fixed contact plate 2 receives the energy of the collision, and the buffer body 21 absorbs the energy when it tries to deflect in the direction of the collision. Therefore, compared to the general example described above, the deflection speed of the fixed contact plate 2 is small, and the force to return is almost eliminated, so that the contact points 1.3 are separated after a collision, and
Contact, or so-called bounce, can be significantly reduced. As a result, arcing due to bounce is less likely to occur between the contacts 1 and 3 during the contact/separation operation, and the life of the contacts can be extended. Further, according to the present invention, by adding a buffer body 21 to the electromagnetic relay described in the general example, it is possible to easily extend the life of the north contact.

3 and 4 show different embodiments of the present invention, which differ from the previous embodiments in the material and shape of the fixed contact plate. Therefore, the same members as in the previous embodiment are given the same reference numerals. In this device, the fixed contact plate 22 is formed of a visible printed circuit board, and the portion on which the fixed contact 1 is provided is fixed to the inner wall surface of the cover 14 of the housing 12 via a buffer body 21. Therefore, the fixed contact plate 22 has no spring properties at all, and its main function is to electrically connect the fixed contact 1 and the fixed contact terminal 15. In this case, all of the above collision energy is absorbed by the buffer 21, so
The effect becomes greater.

[Effects of the Invention] The electromagnetic relay of the present invention includes a fixed contact, a fixed contact plate provided with the fixed contact, a movable contact plate provided with a movable contact that contacts and separates from the fixed contact, a yoke, an iron core, and a coil. a movable iron piece and an electromagnetic device in which the movable iron piece is actuated or displaced to a normal position by excitation or demagnetization of the coil, and these are housed in a housing, and a movable contact plate responds to the movable iron piece to open both contacts. In electromagnetic relays that operate on contact and separation, a B-sided body made of a viscoelastic material that absorbs the energy of the collision received by the fixed contact plate during contact operation is provided between the fixed contact plate and the housing, so that the contact operation can be improved. Since the impact energy received by the fixed contact plate during this process is absorbed by the buffer, the bounce between the fixed and movable contacts can be significantly reduced, thereby extending the life of the contacts.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view showing one embodiment of the present invention; FIG. 2 is a perspective view thereof; FIG. 3 is a partially sectional side view showing a different embodiment of the present invention. FIG. 4 is a side view, FIG. 4 is a perspective view thereof, and FIG. 5 is a perspective view showing a general example. 1-fixed contact, 2.22-fixed contact plate, 3-movable contact,
4-・Movable contact plate, 5-Electromagnetic device, 6-Yoke, 7-
Iron core, 8...-Coil, 9...-Movable iron piece, 10-Return spring, 11--Card, 12--Housing, 13-Base, 14--Cover, 21--&! impact body

Claims (2)

[Claims] (1) A fixed contact, a fixed contact plate provided with the fixed contact, a movable contact plate provided with a movable contact that contacts and separates from the fixed contact, and excitation of the coil, including a yoke, an iron core, a coil, and a movable iron piece. Or an electromagnetic relay comprising an electromagnetic device in which a movable iron piece is actuated or displaced to a normal position by degaussing, these are housed in a housing, and the movable contact plate responds to the movable iron piece to cause both the contacts to move toward and away from each other. In,
An electromagnetic relay characterized in that a buffer made of a viscoelastic material is provided between the fixed contact plate and the housing to absorb the energy of a collision received by the fixed contact plate during a contact operation. (2) The fixed contact plate is formed of a flexible printed circuit board, and the portion where the fixed contact is provided is fixed to the housing via the buffer body. electromagnetic relay.