JPH089869Y2 - Electromagnetic relay - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a sound insulation structure for noise generated from an electromagnetic relay.

Generally, an electromagnetic relay composed of an electromagnet, a magnetic circuit, a contact spring assembly, etc., causes noise at the time of operation and restoration due to the impact of the armature being attracted to the iron core, the impact between contacts when opening and closing the contacts, the vibration of the contact spring, etc. Occurs.

The noise that normally does not cause annoyance is also extremely annoying when used in an electromagnetic relay, for example, when mounted in a relatively small room.

[Conventional technology]

Conventionally, an electromagnetic relay having a movable part such as an armature and a movable contact spring, and a cover for protecting the contact, for example, a main part 2 such as an electromagnet, a magnetic circuit, and a contact spring assembly as shown in FIG.
An electromagnetic relay 1 in which a box-shaped base 3 having lead terminal lead-out holes and a cover 4 attached to the base 3 are housed in a container.
In general, the container is generally formed by molding a resin such as polycarbonate.

The thickness of the container is thin to the extent that the electromagnetic relay 1 can be miniaturized and the mechanical strength of the container can be secured and the container can be molded.

[Problems to be solved by the invention]

For a certain type of electromagnetic relay that has a conventional configuration, microphones are placed 5 mm apart, and the operating noise is measured to be about 90 dB, and as mentioned above, the noise that is excessive for applications where noise is a problem is It has been found that the thin and light container and the light weight of the spring and the like formed to have a uniform thickness are one of the factors that cause poor noise insulation with respect to internally generated sound and increase noise.

As a measure for improving the sound insulation, the thickness of the container may simply be increased. However, this has the disadvantages that the electromagnetic relay becomes large, the efforts for miniaturization in the past are significantly delayed, and a new mold must be prepared.

Further, simply thickening or enlarging the spring or the like in order to reduce the operation noise is not suitable because the operating characteristics such as the contact pressure of contact and the miniaturization are impaired.

[Means for solving problems]

The present invention is intended to solve the above problems,
An electromagnetic relay in which an electromagnet, a magnetic circuit, and a contact spring set are housed in a container, and a coil of the electromagnet and a conductor terminal connected to a contact of the contact spring set lead out from the container. At least a part of the movable contact spring or the fixed contact spring constituting the magnetic circuit, the armature, the yoke or the iron core constituting the magnetic circuit is mixed with a member for increasing the specific gravity of those constituent members or a metal plate is adhered thereto. Further, the container is made of plastic containing metal powder, a metal plate is attached to the inner surface of the container, the movable contact spring, the fixed contact spring, and the armature. An electromagnetic relay characterized in that a metal plate is adhered to the yoke, and a soft metal plate having a larger specific gravity than the iron core material is adhered to the magnetic pole surface of the iron core. is there.

[Action]

According to the above means, the weight of the components is increased without increasing the size of the electromagnetic relay as compared with the conventional one, the noise generated by improving the sound insulation of the container can be reduced, and the conventional manufacturing apparatus can be used as it is. It can be implemented with a small investment.

〔Example〕

FIG. 1 is a perspective view of an electromagnetic relay according to an embodiment of the present invention, which is disassembled into a relay main part, a cover and a base body, and FIG. 2 is an exploded view of an electromagnetic relay container according to another embodiment of the present invention. Fig. 3 is a perspective view, Fig. 3 is a sectional view in which the insulating plate shown in Fig. 2 is inserted into the base body, and Fig. 4 is an exploded perspective view of a metal plate attached to an electromagnetic relay according to still another embodiment of the present invention. It is a figure.

In FIG. 1, the electromagnetic relay 1 includes an electromagnet, a magnetic circuit,
A main part 2 composed of a contact spring set and the like, a box-shaped base 3 formed by molding a resin mixed with a metal powder such as nickel,
The cover 4 is formed by molding a resin mixed with metal powder such as nickel, and the cover 4 is attached to the base body 3 having a plurality of lead terminal lead-out holes 3a.

The main part 2 is a pair of vertically opposed flanges 5a and 5b.
5, the bobbin 5 integrally formed with the coil 6, the coil 6 wound around the bobbin 5, and the fixed contact terminals supported by the flanges 5a and 5b.
7,8, Y-shaped yoke 9 in side view, armature 10, and movable contact spring 11 that is L-shaped in side view and supports the armature 10.
A coil terminal 12 which is supported by the flange 5a and to which the winding end of the coil 6 is connected, an iron core 13 (not shown), each fixed contact terminal 7, and a contact (not shown) welded to the movable contact spring 10 .

The main part 2 has a conventional structure and is a coil terminal.
When a predetermined current is passed through the coil 6 via the coil 11 and the current is cut off, the armature 10 fixed to the movable contact spring 10 is attracted or separated from the magnetic pole surface of the iron core 13, and a pair of fixed contact and movable contact are switched. Is selectively performed.

On the other hand, the base body 3 and the cover 4 which are formed in substantially the same shape as the conventional one by the same method are formed by molding polycarbonate containing metal powder such as nickel.
The lead terminal (lead parts of the contact springs 7 and 8 and the coil terminal 12) lead-out hole 3a formed in the bottom surface of the lead terminal 3a has such a size that the lead terminal does not come into contact therewith.

Therefore, the base body 3 and the cover 4 are heavy because they contain nickel, which has a specific gravity of about 8.9, as compared with a conventional product using polycarbonate having a specific gravity of about 1.2, and the sound insulation is improved.

An insulating plate inserted between the bottom surface of the base body 3 and the bobbin 5a in FIG.
Reference numeral 15 is made of an electrically insulating resin (for example, polycarbonate), and when inserted into the base body 3 as shown in FIG. 3, the plurality of holes 15a through which the lead terminals penetrate are formed in the base body 3.
Inside of the hole 3a, that is, the lead terminal has a small penetrating allowance.

Therefore, the insulating plate 15 contributes to ensuring electrical insulation between each lead terminal and the base body 3.

In FIG. 4 in which the same reference numerals are used for the common parts as in FIG. 1, (a) is the main part of the relay and the metal piece attached to its constituent parts, and (b) is the base body of the container accommodating the main part. 16 is a perspective view showing the cover of the container and the metal plate adhered thereto, 16 is a small piece of lead adhered to the upper surface of the contact spring 7, 17 Is a small piece of lead attached to the side surface of the contact spring 7, 18 is a small piece of lead attached to the upper surface of the contact spring 8, 19 is a small piece of lead attached to the side surface of the contact spring 8, and 20 is an armature 11. A small piece of lead to be adhered to the upper surface, 21 is a small piece of lead to be adhered to the rear surface of the yoke 9, 22 is a small piece of lead to be adhered to the magnetic pole surface of the iron core, 23 is a lead plate to be inserted into the base 3, 24 Is a lead plate attached to the ceiling surface of the cover 4.

The lead small pieces 16 to 22 and the lead plates 23 and 24 are shaped so as not to come into contact with other constituent parts, which contributes to an increase in the weight of the adhered parts and reduces the occurrence of operation noise.

[Effect of device]

As described above, according to the present invention, the noise when the microphone is installed about 5 mm away from the conventional noise is about 90%.
The effect which was reduced from dB to about 75 dB and could be realized with a small investment is remarkable.

[Brief description of drawings]

FIG. 1 is a perspective view of an electromagnetic relay according to an embodiment of the present invention disassembled into a relay main part, a cover and a base body, and FIG. 2 is an exploded view of an electromagnetic relay container according to another embodiment of the present invention. Fig. 3 is a perspective view, Fig. 3 is a sectional view in which the insulating plate shown in Fig. 2 is inserted into the base body, and Fig. 4 is a perspective view of a metal plate attached to an electromagnetic relay according to still another embodiment of the present invention. Fig. In the figure, 1 is an electromagnetic relay, 2 is a main part of the electromagnetic relay, 3 is a base,
4 is a cover, 6 is a coil, 7 and 8 are fixed contact terminals, 9 is a yoke, 10 is an armature, 11 is a movable contact terminal, 16 to 22 are small pieces of lead (metal plate), and 23 and 24 are lead plates. (Metal plate) is shown.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Koji Iiyoshi 1300, Furuma, Shinano-cho, Kaminamiuchi-gun, Nagano FUJITSU PARTS CO., LTD. (56) References

Claims (5)

[Scope of utility model registration request] 1. An electromagnetic relay in which an electromagnet, a magnetic circuit, and a contact spring set are housed in a container, and a conductor terminal connected to a coil of the electromagnet and a contact of the contact spring set is led out from the container. A movable contact spring or a fixed contact spring constituting the contact spring set, or at least a part of an armature, a yoke or an iron core constituting the magnetic circuit is mixed with a member for increasing the specific gravity of those constituent members, or a metal. An electromagnetic relay characterized in that a plate is attached. 2. The electromagnetic relay according to claim 1, wherein the container is formed of plastic containing metal powder. 3. The electromagnetic relay according to claim 1, wherein the container is formed of plastic and a metal plate is attached to the inner surface of the container. 4. The electromagnetic relay according to claim 1, wherein the movable contact spring, the fixed contact spring, the armature, and the yoke are covered with a metal plate. 5. The electromagnetic relay according to claim 1, wherein the magnetic pole surface of the iron core is covered with a soft metal plate having a larger specific gravity than the material of the iron core. .