JP2893853B2 - Electromagnetic relay - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electromagnetic relay, and more particularly to an electromagnetic relay using a U-shaped iron core.

[Prior art] Conventionally, such an electromagnetic relay mounts a coil assembly in which a coil is wound around a U-shaped iron core on an insulator base, arranges an armature thereon, covers with a cover, and seals a terminal side. Sealed with a blocking agent.

FIG. 3 is a cross-sectional view showing the position of the iron core, flange, and fixed terminal in the electromagnetic relay for explaining one example of the related art.

As shown in FIG. 3, the conventional electromagnetic relay includes an insulator base 15 in which fixed contacts 11 are formed on solid terminals 12 arranged at four corners and a base 18 and a hole 17 are formed, and a coil is wound. A coil assembly in which the turned U-shaped iron core 6 is arranged as a center, a flat flange portion 23 is formed on the upper surface, and a minute projection 21 which contacts the leg portion 20 and the reference base 18 is formed on the lower surface; (Both not shown) and the like, and a cover 16 for covering the coil terminals and the contact terminals. That is, a coil assembly having a U-shaped iron core 6 is fixed inside an insulator base 15, an armature interlocking with a movable contact spring is disposed above the coil assembly, and a cover 16 is attached. The flange portion 23 beside the magnetic pole portion of the U-shaped iron core 6 is formed in a shape along the winding.

[Problems to be solved by the invention]

In the above-described conventional electromagnetic relay, since the magnetic pole portion exposed from the coil assembly and the fixed contact portion implanted by the insulator base are located at a close distance, the insulation between the contact and the coil reduces the creepage distance and the space distance. Both of these are inadequate and have the drawback of causing a breakdown voltage failure.

An object of the present invention is to provide an electromagnetic relay capable of improving the insulating properties of the exposed magnetic pole portion and the contact point of the iron core and realizing a high withstand voltage.

[Means for solving the problem]

In the electromagnetic relay according to the present invention, a protrusion of an insulator protruding upward from the side holding the U-shaped iron core is interposed between the fixed contact corresponding to the movable contact of the movable contact spring and the magnetic pole portion of the U-shaped iron core. It is characterized by having made it.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an exploded perspective view of an electromagnetic relay showing one embodiment of the present invention.

As shown in FIG. 1, in this embodiment, a concave portion for disposing a permanent magnet 9 is formed in the center of a U-shaped iron core 6 around which a coil is wound, and a coil spool 8 having flange portions 23 at both ends is provided. A coil assembly, an armature 4 arranged at both ends so as to be adapted to both magnetic pole portions of the iron core 6, a hinge spring portion 2 for causing the armature 4 to perform a tilting motion, and a movable member arranged near the armature 4. A movable contact spring block having the contact 1 and a movable contact spring block integrally fixed by an insulating fixed body 5; an insulator base 15 adapted to be tiltable with the upper part of the permanent magnet 9 as a fulcrum; 2 is an electromagnetic relay constituted by fixing the cover 2 to the neutral terminal 13 of the insulator base 15 and covering it with a cover 16.

In the electromagnetic relay having such a configuration, in the present embodiment, the core 6
The protrusion 24 is provided on the upper surface of the horizontal flange portion 23 of both magnetic pole surfaces and between the iron core 6 and the fixed contact 11 and the fixed terminal 12.

2 (a) and 2 (b) are a plan view of the insulator base and the coil assembly of the electromagnetic relay shown in FIG. 1 and a cross-sectional view showing a positional relationship among an iron core, a flange, and a solid terminal.

As shown in FIGS. 2 (a) and 2 (b), the conventional insulation withstand voltage failure was caused by the fixed terminal 12 having the fixed contact 11 passing through the surface of the flange portion 23 of the coil spool 8 and the iron core 6. In this embodiment, by providing the projecting portion 24 on the flange portion 23 of the coil spool 8, the creepage distance between the iron core 6 and the fixed terminal 12 can be doubled or more, and the fixed terminal 12 can be viewed directly from the iron core 6. Since it is not possible, the spatial distance can be increased.

〔The invention's effect〕

As described above, the electromagnetic relay of the present invention provides the U-shaped iron core and the fixed contact by providing the insulator protrusion between the magnetic pole part of the U-shaped iron core and the fixed contact provided on the insulator part. The creepage distance is sufficient to greatly improve the insulation, the space between the U-shaped iron core and the fixed contact is sufficient to improve the withstand voltage, and the collision between the magnetic pole surface of the U-shaped iron core and the armature This has the effect of preventing scattering of wear powder to the vicinity of the contact due to dust.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an electromagnetic relay showing one embodiment of the present invention, and FIGS. 2 (a) and 2 (b) are a plan view of an insulator base and a coil assembly of the electromagnetic relay in FIG. 1, respectively. FIG. 3 is a sectional view taken along the line A-A showing the positional relationship between the iron core, the flange, and the fixed terminal. FIG.
It is A sectional drawing. 1 movable contact 2 hinge hinge spring 3 movable contact spring 4 armature 5 insulated fixed body 6 iron core
7 ... coil terminal, 8 ... coil spool, 9 ... permanent magnet, 10 ... projection, 11 ... fixed contact, 12 ... fixed terminal,
13 ... Neutral terminal, 14 ... Coil lead-out terminal, 15 ... Insulator base, 16 ... Cover, 17 ... Hole, 18 ... Reference base, 19 ...
... Notch, 20 ... Leg, 21 ... Small projection, 22 ... Sealant, 23 ... Flange, 24 ... Protrusion.

Claims (1)

(57) [Claims] 1. A U-shaped iron core wound with a coil, a permanent magnet, an armature having both ends corresponding to both magnetic pole portions of the U-shaped iron core and performing a tilting motion, and a vicinity of an end of the armature. A movable contact spring attached to the armature having a movable contact located at, and an electromagnetic relay including an insulator portion having a fixed contact corresponding to the movable contact, wherein the magnetic pole portion of the U-shaped iron core; An electromagnetic relay, wherein a protrusion of an insulator protruding upward from a side holding the U-shaped iron core is interposed between the fixed contact and the fixed contact.