JPS62223931A - 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] The present invention relates to an electromagnetic relay that angularly displaces a movable iron piece by energizing or demagnetizing a coil, and opens and closes contacts in accordance with the angular displacement operation.

[Background Art] When an electromagnetic relay operates a contact opening/closing operation, that is, when a coil is energized or demagnetized and a movable iron piece is angularly displaced,
In either case, there is a metallic sound generated by the collision of related parts. Den Haitsu? U-units are incorporated into various types of equipment, especially in many household electrical appliances and OA equipment used in relatively quiet environments. For electromagnetic relays compatible with such devices, it is desirable to reduce the noise generated as much as possible.

As a measure to reduce such generated noise, a measure as shown in FIG. 4 has conventionally been implemented. (a) is an overall front view of the relay, (
b) is the upper electromagnet part A, and (c) is the lower contact part B.

Electromagnet part A consists of a U-shaped yoke C, a fixed iron core, and a coil E.
These tips extend into the contact portion B.

In the contact part B, a movable iron piece F that faces the tip and side of the fixed iron core with a small gap is fixed to the intermediate part of a leaf spring G supported at both ends, and is connected to the tip of the fixed iron core and the other side of the fixed iron core with a small gap between them. The movable contact H located thereon is supported in a cantilevered manner. A movable contact K that comes into contact with and separates from a fixed contact J provided on the fixed contact I is provided at the tip of the movable contact H. L is a plastic presser movably interposed between the movable iron piece F and the movable contact H.

In this case, when the coil E is energized, the movable iron piece F is attracted to the fixed iron core while deflecting the leaf spring G, and therefore the movable contact H is pressed through the pusher, and the movable contact K is moved to the fixed contact J. come into contact with. When the coil E is demagnetized in this state, the movable iron piece F returns to the normal (initial) position due to the spring force M multiplied by the leaf spring G, and therefore the movable contact H also returns and the movable contact K separates from the fixed contact J. do.

As is clear from this operation, when the coil E is demagnetized, since the abutting members are a metal member and a plastic member, the noise generated can be significantly reduced. however,
When the coil E is energized, both contacts J and K collide, and the vibrations generated therein are propagated through the contact member, so that a large amount of noise is still generated. In other words, although the number of occurrences of loud sounds has decreased, the loud sounds themselves still exist.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned reasons, and its purpose is to provide an electromagnetic relay that can reduce noise generated during both excitation and demagnetization operations.

[Disclosure of the Invention] The electromagnetic relay of the present invention is characterized in that an elastic member is provided on the surface of the leaf spring attached to the movable iron piece that comes into contact with the position regulating member, so that the elastic member does not directly touch the plate spring during demagnetization. It absorbs the shock caused by the collision during excitation, and also absorbs the vibration generated by the collision during excitation, thereby reducing the noise generated during both excitation and demagnetization operations.

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

Reference numeral 1 denotes an L-shaped yoke, which is formed by bending a thick magnetic plate, and has a supporting portion 1a for a movable iron piece, which will be described later, at its end.

Reference numeral 2 denotes a fixed iron core made of magnetic material in the shape of a round or square rod, and is magnetically coupled (not shown) perpendicularly to one side of the yoke 1 by caulking or the like.

A coil 3 is wound around the outer periphery of the fixed iron core 2 via a bobbin 4.

Reference numeral 5 denotes a movable iron piece, which is made of a thick magnetic plate and bent to form an L-shape, and one side 5a is connected to the fixed iron core 2 when the coil 3 is energized.
A leaf spring 8 is mounted so as to be attracted to the end surface 2a of the plate spring 8, and has a movable contact 7 on the other side 5b that contacts and separates from the fixed contact 6.
The intermediate portion 5C is supported by the support portion 1a of the yoke l so as to be freely angularly displaceable. The leaf spring 8 is a movable iron piece 5. It is electrically connected to a movable contact terminal (not shown) via a yoke l.

Reference numeral 9 denotes a return spring, which has a coil shape and is tensioned and suspended between the yoke 1 and one side 5a of the movable iron piece 5, and biases the movable iron piece 5 in a direction away from the end surface 2a of the fixed iron core 2.

A position regulating member 10 is provided on the yoke 1 to regulate the normal position of the leaf spring 8 (including the movable iron piece 5 and the movable contact 7) when the coil 3 is demagnetized.

The position regulating member 10 may be made of a conductive plate material or plastic, and in the case of the former, its tip may be extended to serve as a movable contact terminal.

Reference numeral 11 denotes an elastic member, which is made of a rubber sheet, for example, and is provided on the surface of the leaf spring 8 that comes into contact with the position regulating member 10, as shown in FIG. Further, as shown in FIG. 2, the elastic member 11 may be formed to have a size that includes a portion that abuts the position regulating member 10 and is also interposed between the leaf spring 8 and the movable iron piece 5.

(Operation) FIGS. 1 and 2 show the coil 3 in a demagnetized state, and the spring force of the return spring 9 causes both contacts 6.7 to open, and the leaf spring 8 (more specifically, the elastic member 11) to restrict the position. It is in its normal position abutting member 10.

When the coil 3 is excited in this state, the movable iron piece 5 is attracted to the end surface 2a of the fixed iron core 2 against the spring force of the return spring 9, and therefore the movable contact 7 comes into contact with the fixed contact 6.

Next, when the coil 3 is demagnetized in this state, the movable iron piece 5 separates from the end face 2a of the fixed iron core 2 due to the spring force of the return spring 9, and both contacts G and 7 are opened, and the handling spring 8 (for details The elastic member 11) returns to its normal position in contact with the position regulating member 10.

In this operation, the contacts 6 and 7 collide during excitation, and the leaf spring 8 (more specifically, the elastic member 11) collides with the position regulating member 10 during demagnetization, thereby producing noise. In that case, during demagnetization, the elastic member 11 directly buffers and absorbs the impact at the time of collision, and during excitation, the plate spring 8 attempts to vibrate due to the collision, but the elastic member 11 absorbs this, and therefore, during excitation. This makes it possible to reduce the noise generated during both the degaussing and degaussing operations.

As a result of noise measurements to confirm these effects,
The following experimental data were obtained. This noise measurement was conducted during excitation, when it is difficult to take measures to reduce the generated noise. After analysis, the result was as shown in Figure 3. Note that the conventional one is replaced by one in which the elastic member 11 of the present invention is removed, and the driving voltage is set to DCI.
2■.

According to this experimental data, comparing the sound pressures in the order of ■ to ■ above, the RMSA class is 63.3.5B, 4.56.5B,
The frequency of 8 kHz, which is harsh for humans, is 59.
5.50.4.47.3.10 kllz is 54.4.
50.1.43.8.12.5 kllZ is 56.4
．． 49.7.47.9 [dB], and it can be seen that ■■ is lower than ■, and ■ is lower than ■.

[Effects of the Invention] The electromagnetic relay of the present invention has an elastic member on the surface of the leaf spring attached to the movable iron piece that contacts the position regulating member.
During demagnetization, the elastic member directly buffers and absorbs the shock caused by the collision, and during excitation, the elastic member also absorbs the vibrations generated by the collision, so the noise generated during both the excitation and demagnetization operations is reduced. This can be reduced.

[Brief explanation of drawings]

FIG. 1 shows one embodiment of the present invention, (a) is a side view including a partial cross section, (b) is a plan view, and FIG. 2 is a diagram showing another embodiment of the present invention. 3 is a characteristic diagram showing the frequency analysis of the present invention, and FIG. 4 shows a conventional example, (a) is an overall front view, (b) is an electromagnet part, ( c) is the contact part B. 1.-Yoke, 2.. Fixed core, 3.-Coil, 5-
Movable iron piece, 6 - fixed contact, 7 - movable contact, 8 - plate spring, 9 - return spring, 10 - position regulating member, 11 - elastic member. Matsushita Electric Works Co., Ltd. Representative Patent Attorney
Takemitsu Senkou (and 2 others) Figure 1 (a) (b) Figure 2 Figure 3 M Yumaki [Out] Figure s4 (a) (b) (C)

Claims (1)

[Claims] (1) An L-shaped yoke, a fixed core magnetically coupled perpendicularly to one side of the yoke, and a coil wound around the outer periphery of the fixed core; a movable iron piece that is positioned so as to be attracted to the end face of the fixed iron core, has a plate spring provided on the other side with a movable contact that comes into contact with and separates from the fixed contact, and whose middle part is supported by the yoke so as to be freely angularly displaceable; and an electromagnetic relay comprising a return spring that urges the movable iron piece in a direction away from the end face of the fixed iron core, and a position regulating member that regulates the regular printing position of the leaf spring when the coil is demagnetized, An electromagnetic relay characterized in that an elastic member is provided on the surface of the leaf spring that comes into contact with the position regulating member.