JPS63207019A - Electromagnetic relay - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] [Technical Field j] The present invention operates and demagnetizes a coil of an electromagnetic device to operate or displace a movable iron piece to a normal position, and fixes the movable iron piece in response to the displacement operation of the movable iron piece. .

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

[Background technology] Electromagnetic relays produce metallic collision noises due to collisions of related parts when the contacts are connected/disconnected (opened/closed), that is, when the coil of the electromagnetic device is excited or demagnetized to displace the movable iron piece. occurs. Such electromagnetic relays are incorporated into various devices, and are especially relatively quiet! ! ! They are often incorporated into household electrical equipment and OA equipment used in trenches. For electromagnetic relays compatible with such equipment, it is desirable to reduce the collision noise as much as possible.

Therefore, the applicant of the present application proposed a countermeasure in Japanese Patent Application No. 61-66461 in order to reduce the above-mentioned collision noise. That is, as shown in Fig. 4, an elastic member is provided on the surface of a leaf spring C attached to a movable iron piece B of the electromagnet device that comes into contact with the position regulating member A, so that the elastic member rests during demagnetization. It directly buffers and absorbs the impact of a collision, and also absorbs the vibrations caused by the collision during excitation.
This reduces collision noise during both excitation and demagnetization operations. E is a yoke, F is a fixed core, G is a coil, H is a fixed contact, and J is a movable contact.

However, even with this structure, the collision between the movable iron piece B and the fixed iron core F cannot be avoided, and therefore there is no effect of reducing the collision noise, and there is still a need to reduce the overall collision noise.

[Object of the Invention] The present invention has been made in view of the above reasons, and its object is to provide an electromagnetic relay that eliminates the collision noise of the electromagnet device portion and reduces the overall collision noise.

[Disclosure of the Invention] The electromagnetic relay of the present invention includes a fixed contact, a movable contact plate provided with a movable contact that connects and separates from the fixed contact, a yoke, a coil wound around the yoke, and a coil that is activated or demagnetized by excitation or demagnetization of the coil. In an electromagnetic relay that includes an electromagnetic device constituted by a movable iron piece that is respectively displaced to the operating or normal position, and in which a movable contact plate responds to the movable iron piece and both contacts move toward and away from each other, the movable iron piece has a substantially center point. The yoke is rotatably supported and is provided with a magnetic flux exchange part and a movable contact plate pressing part symmetrical with respect to the center at each end extending on both sides of the center, and the yoke has a U-shape 2 ( It consists of IM yoke pieces, and a permanent magnet is inserted into one leg of one yoke piece so that the end face of each leg faces the magnetic flux exchange part of the movable iron piece, and between the connecting pieces of both yoke pieces. are connected by a magnetic material, and the magnetic flux transfer portion of the movable iron piece is formed so that it does not contact the yoke in either the operating or normal position and the gap between it and the end face of each leg piece changes. .

According to the present invention, collision noise of the electromagnet device part is eliminated,
The collision noise generated during excitation is limited to that generated between both contacts, and the overall collision noise can be reduced.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 3.

■ is the base of the electromagnetic relay made of insulating material. Reference numeral 2.2 denotes a fixed contact, which is fixed to one end of the fixed contact plate 3.3 and contacts (opens and closes) a movable contact, which will be described later. The other end of the fixed contact plate is fixed to the base 1, and the portion protruding from the base serves as a fixed contact terminal.

4.4 is a movable contact plate made of an elastic conductive material, the base end of which is fixed to one end of a movable contact terminal plate 5.5 fixed through the base l, and a movable contact 6.6 is provided at the tip. . In addition,
This embodiment will be described with a normally open contact configuration. In addition, the contact point is
Two circuits are not necessarily required, and one circuit may be used.

7 is a yoke consisting of a U-shaped 2111 yoke piece 8.9, a coil 10.10 wound around the yoke, and a movable iron piece 1.
This is an electromagnet device consisting of 1.

The movable iron piece 11 has a substantially I-shaped planar shape, and has a base tta
A shaft hole 11b is provided at approximately the center CP of the shaft portion 1 of the base 1.
a, and is moved to the operating (contact open) position when the coil 10 is energized, and to the normal (contact open) position when the coil 10 is demagnetized. At each end extending on both sides of the center CP, there is a magnetic flux transfer portion ILC, 11e and a movable contact plate 4 symmetrically shaped with respect to the center CP.
Pressing portions lid and lid of degree 4 are provided. During demagnetization, the movable iron piece 11 is regulated to a normal position by the magnetic flux of a permanent magnet, which will be described later.

One leg piece 8a of the yoke piece 8 on one side is formed of a permanent magnet. It should be noted that a permanent magnet may be provided in a part of one of the leg pieces, and it is said that a permanent magnet is inserted in one leg piece including these. The other yoke piece 9 is integrally formed to have the same shape as the yoke piece 8 in plan view. These pieces of coke8.
The end surfaces of one leg piece 8a, 8b, 9a, 9b of 9 are as follows:
Magnetic flux exchange part iic, it of the movable iron piece through a predetermined gap
It is arranged symmetrically so as to face C. Further, the connecting pieces 8'c and 9c of both yoke pieces are connected by a flat magnetic body 12.

A coil 10.10 is wound around each other leg piece 8b, 9b and electrically connected to the coil terminal 13 so that their magnetic fluxes are superimposed.

More important points are the magnetic flux transfer part 11c of the movable iron piece 11,
llc does not contact the end surfaces of all the leg pieces 8a, 8b, 9a, 9b of the yoke piece in both the operating and normal positions, and the gap gl (8a, 9a-11C
) and g2 (between 8b and 9b and 9b). Specifically, it is formed into a curved surface having a radius r sufficiently smaller than the distance from the center CP to the magnetic flux transfer parts 11C, 11C, and whose center is located on a line CT passing through the center CP and parallel to the longitudinal direction. Note that a regulating member for regulating the normal position of the movable iron piece 11 may be provided. Moreover, when the above-mentioned shaft portion 1a overlaps with the magnetic body 12, these may be provided on the magnetic body 12.

Thus, the coil 10.10 of the electromagnetic device is energized or demagnetized to operate or displace the movable iron piece 11 to the normal position, and in response to the displacement operation of the movable iron piece 11, both the fixed and movable contacts 2, 6 It causes the contact/separation (opening/closing) operation.

(Operation) In FIGS. 1 and 3, the coil 10 is in a demagnetized state, the magnetic flux φM of the permanent magnet flows through all the gaps, and the coil 10 is in a normal position where the attractive forces in all the gaps are balanced.

Therefore, the movable contact plate 4.4 is not driven, and both contacts 2.6 are in an open state, with the gap g1 being at its minimum and g2 being at its maximum.

When the coil 10.10 is excited in this state, the magnetic flux φC of the coil flows as shown by the dashed line in FIG. 3 together with the magnetic flux φM of the permanent magnet. As is clear from the figure, most of the magnetic flux φC of the coil is concentrated on the other leg pieces 8b and 9b of both yoke pieces because it is difficult for the magnetic flux φC of the coil to pass through the permanent magnet and because of the presence of the magnetic body 12. (The other leg piece 9b of the yoke piece 9 has both magnetic fluxes φM
, φC are superimposed), the suction force in the gap g2 increases, and the movable iron piece 11 rotates clockwise and is displaced to the operating position through the state indicated by the broken line in FIG. 3. Therefore, the movable contact plate 4 is pressed (driven) by the pressing parts lid, lid, and both the contacts 2, 6
is in a closed state, and at this time, the gap g1 is the maximum and the gap g2 is the minimum.

Next, when the coil 10 is demagnetized, the magnetic flux φC stops flowing, so the movable iron piece 11 returns to its normal position, and both contacts 2
．． 6 is in the open state.

As is clear from this operation, the movable iron piece 11 is connected to the yoke piece 8 of the electromagnetic device in both the operating and normal positions.
, 9, and therefore the collision noise between these members can be eliminated. Furthermore, the magnetic body 12 efficiently superimposes and cancels magnetic fluxes, improving magnetic efficiency.

Although this embodiment has been described using a normally open contact configuration, it can also be changed to a closed contact configuration.

[Effects of the Invention] The electromagnetic relay of the present invention is an electromagnetic relay in which a movable contact plate is fixed in response to a movable iron piece, and both movable contacts move toward and away from each other, in which the movable iron piece is rotatably supported approximately at its center. , each end extending on both sides of the center is provided with a magnetic flux transfer part and a movable contact plate pressing part that are symmetrical with respect to the center, and the cork is composed of two yoke pieces forming a U-shape, A permanent magnet is inserted into one leg of one of the yoke pieces, and the end face of each leg is arranged to face the magnetic flux exchange part of the movable iron piece, and the connecting pieces of both yoke pieces are connected by a magnetic material, Furthermore, the magnetic flux exchange part of the movable iron piece is formed so that it does not contact the yoke in either the operating or normal position and the gap between it and the end face of each leg piece changes, eliminating collision noise from the electromagnetic device part. The collision noise during excitation is limited to that generated between both contacts,
The overall collision noise can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 is a perspective view showing an embodiment of the present invention.
FIG. 3 is an exploded perspective view of the same, FIG. 3 is a plan view thereof, and FIG. 4 is a conventional example, (a) is a side view, and (b) is a plan view. 1 - base, 2 - fixed contact, 4 - movable contact plate, 6 -
Movable contact, 7--electromagnetic device, 8.9--yoke (2
yoke pieces), 8a, 9a -- one leg piece, 8b, 9
b-・-Other leg piece, 8c, 9cm connecting piece, 10.10・
-Coil, 11-・Movable iron piece, cp-・Center of movable iron piece, llc, 1lc-・Magnetic flux exchange part, 11d, 11d--
- Pressing part, 12-magnetic material.

Claims (1)

[Claims] (1) A fixed contact, a movable contact plate provided with a movable contact that contacts and separates from the fixed contact, a yoke, a coil wound around the yoke, and a coil that is actuated or displaced to a normal position by excitation or demagnetization of the coil, respectively. and an electromagnet device constituted by a movable iron piece, wherein the movable contact plate responds to the movable iron piece to cause both the contacts to move toward and away from each other, wherein the movable iron piece is rotatable approximately at its center. A magnetic flux exchange part and a movable contact plate pressing part each having a symmetrical shape with respect to the center are provided at each end that is supported and extends on both sides of the center, and the yoke is formed of two yoke pieces having a U-shape. A permanent magnet is inserted into one leg of one of the yoke pieces, and the end face of each leg is arranged to face the magnetic flux exchange part of the movable iron piece, and the space between the connecting pieces of both yoke pieces is made of magnetic material. An electromagnetic relay in which the magnetic flux exchange portion of the movable iron piece is connected to the yoke and is formed so that the gap between it and the end face of each leg piece changes without contacting the yoke in either the operating or normal position.