JPH0418682B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an electromagnetic device for a polarized relay.

[Background technology]

Conventionally, in the case of a polarized relay, as shown in FIG. 1, as an electromagnetic device, a coil frame 4 is attached, with magnetic pole parts 2 at both ends of an iron core 1 and a winding part 3 in the middle part. A coil frame sprue head 5 is integrally formed at both ends of the winding portion 3 by plastic molding of synthetic resin.

In the conventional configuration shown in FIG. 1, the attractive force when the magnetic pole part and the armature (not shown) are in close contact with each other due to the magnetomotive force of the permanent magnet (not shown) is too large compared to the spring load. A non-magnetic material (phosphor bronze plate) is welded to the magnetic pole part 2 to improve consistency with the spring load, but compared to non-polar relays, the parts and welding costs for the residual plate 6 are lower. In addition to being relatively expensive, there is a risk that the extremely thin residual plate 6 may be deformed during the assembly process, and in that case, changes in characteristics are unavoidable.

Furthermore, since the winding portion 3 is formed by plastic molding, it cannot be made very thin, which poses an obstacle to winding a coil with a larger number of turns in order to increase the coil constant as much as possible, especially when manufacturing a highly sensitive relay.

As an improvement to increase this coil constant, as shown in Fig. 2, it has been proposed to completely omit the synthetic resin material of the winding part 3 and obtain insulation between the iron cores 1 only by coating the coil windings. The edges of the conductive iron core 1 could cause wire breakage during winding, poor insulation due to peeling of the coating, and shortening.

[Purpose of the invention]

The present invention focuses on the above-mentioned conventional situation, and aims to make it possible to obtain a non-magnetic material that does not deform and also increase the coil constant.

[Disclosure of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 3 to 4.
This will be explained with reference to the figures.

The iron core 21 is formed by pressing a flat magnetic material.

Next, the resin coating B is applied to the iron core 2 by immersing the iron core 21 in a paint bath or by spraying paint.
Formed all over the surrounding area of 1. The thickness of this coating B is the minimum necessary for the reciprocal action and the insulation between the coil winding and the iron core 21, and is set depending on various conditions such as the type of material, coating means, and specifications of the relay.

As shown in the figure, the coil frame sprue head 22 is attached to the middle of the magnetic pole portion D by plastic molding of a synthetic resin material. Alternatively, the annular coil frame sprue head 22 is manufactured in advance by plastic molding, the annular hole of the coil frame sprue head 22 is forcibly inserted through the iron core 21 and the magnetic pole part D, and the coil frame sprue head 22 is press-fitted around the resin coating B and fixed. Installing.

And two coil frame sprue heads 22, 22
The resin-coated portion B between them is used as a winding portion E, and a coil wire (not shown) is wound thereon. The resin coating B on the magnetic pole portion D is designated as a residual F.

FIG. 5 shows an application of the electromagnetic device formed in this manner to a polarized relay.

That is, a housing is constituted by upper and lower cases 9 and 10 and a body block 1 to which these are attached above and below. 14 is insert molded, and a pair of contact plates 6 and fixed contacts 8 are attached. Each terminal 14
are led out downward from both sides of the body 11, and the contact portion consisting of the contact plate 6 and the fixed contact 8 is connected to the body 1.
A pair are arranged along both inner surfaces of 1. The coil block 2 is made by winding the coil 20 around a coil frame sprue head 22 into which the iron core 21 is inserted, and then wrapping the coil 20 in a molding die with the upper and lower surfaces of both ends of the iron core 21 held by the mold. Full surface and iron core 2
The coil 20 has a pair of shafts 24, 24 which protrude to both sides of the coil 20.
are integrally formed during the above molding. iron core 21
The relative positional accuracy between the upper and lower surfaces of both ends and the shaft 24 is highly accurate, depending on the mold accuracy, even though the shaft 24 is disposed around the outer periphery of the coil 20. This coil block 2 is assembled to the body block 1 by fitting the spring receivers 12 protruding from the inner surfaces of both ends of the body 11 into grooves 25 provided on both end faces of the iron core 21. Further, coil terminals 26 inserted into both ends of the coil block 2 are welded and fixed to the upper surface of the connecting piece 16 at one end of the terminal 14 protruding into the inner surface of the body 11. The coil 20 is electrically connected to the terminal 14 at the same time as the coil block 2 is fixed to the body block 1. Instead of welding, a hole 27 may be provided in the coil terminal 26, a pin 17 may be provided in the connecting piece 16, and the mechanical and electrical connection may be made by caulking.

The pair of upper and lower armatures 3 and 4 both have a coil 2 in the center.
It has a flat rectangular frame shape with an opening that accommodates 0,
A rectangular frame-shaped balance spring 35 is attached to the upper surface of the upper armature 3, and permanent magnets 5, 5 are connected to two pairs of coupling shafts 4 at the center of the upper surface of the lower armature 4.
1 and 41, and one end on each side of the lower surface of the armature 3 and one end on each side of the upper surface of the armature 4, and a card 31 are provided between the lower inner edge of the center of both sides of the armature 3 and the armature 4. A bearing portion 30 is formed at the upper part of the inner edge at the center of both sides. Note that the coupling shaft 41, card 31, and bearing portion 30 are outsert molded onto the armatures 3 and 4. Both armatures 3 and 4 are assembled into the body block 1 from above and below, respectively, and the coil 20 is inserted into the body block 1.
The upper end of a connecting shaft 41 protruding from the lower armature 4 is connected to a hole 32 drilled in the upper armature 3, thereby connecting both armatures 3 and 4. At this time, the two pairs of upper and lower bearing portions 30 in both armatures 3 and 4 sandwich the pair of shafts 24 from above and below. Both armatures 3 and 4 can freely rotate up and down about the shaft 24. Also, at this time,
Armature 3 with upper end surfaces of a pair of permanent magnets 5, 5 facing upward
comes into contact with the bottom surface of the The contact plate 6 and fixed contact 8 in the contact portion are located in a space surrounded by the permanent magnet 5 and the upper and lower armatures 3 and 4. After assembling the coil block 2 and the upper and lower armature blocks 3 and 4 to the body block 1,
Concave grooves 1 are provided on the opening edges of the upper and lower cases 9 and 10, and protrusions 13 are provided on the upper and lower edges of 1 all around
Upper and lower cases 9, 1 by fitting them into the upper and lower cases 9, 19.
Attach 0. The center of the balance spring 35 is caulked and fixed to the center of the upper surface of the armature 3 by pins 36, 36, and the lower surfaces of both ends abut against the upper surfaces of the pair of spring receivers 12.

By applying a voltage to the coil 20, the iron core 21
The upper and lower surfaces (magnetic pole surfaces) at both ends of the permanent magnet 5 are magnetized.
If a magnetic attraction and repulsion is exerted between the ends of both armatures 3 and 4, which are magnetized by
The armatures 3 and 4 rotate around the armature 4, and the contact plate 6 sandwiched between the cards 31 and 31 of the upper and lower armatures 3 and 4 is driven to open and close the contacts.

〔Effect of the invention〕

As explained above, according to the electromagnetic device of the present invention,
Since the resin coating is used to insulate the residual and the coil winding, there is no change in characteristics due to deformation of the residual compared to the conventional method, and since it can be made sufficiently thin, the coil constant is high and the insulation is good.

It also has the feature that it can be provided by one-time coating.

Furthermore, since the iron core 21 is covered by the coating, no rust will occur even in a corrosive environment, and the magnetic properties will be stabilized.

[Brief explanation of drawings]

1 and 2 are sectional views showing a conventional example. 3 to 4 show embodiments of the present invention,
FIG. 3 is a sectional view, and FIG. 4 is a perspective view. FIG. 5 is an exploded perspective view in which the present invention is applied to an electromagnetic relay, and FIG. 6 is a sectional view of FIG. 5. B... Resin coating, C... Coil frame sprue head, D... Magnetic pole part, E... Winding part, 21...
...Iron core.

Claims (1)

[Claims] 1. In an iron core with a magnetic pole portion at the end and a winding portion in the middle, a resin coating is formed on the magnetic pole portion and the winding portion, and a resin coating is formed around the iron core between the winding portion and the magnetic pole portion. An electromagnetic device equipped with a coil frame sprue head. 2. An electromagnetic device according to claim 1, in which a coil frame sprue head is attached around an iron core by plastic molding of synthetic resin. 3. The electromagnetic device according to claim 1, wherein an annular coil frame sprue head is forcibly inserted onto a resin coating of an iron core.