JPS6137508B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnet unit attached to a valve body such as a water supply valve, and more specifically, by applying resin coating to all exposed parts of the device when attached to the valve body, In particular, the present invention relates to an electromagnet unit in which a double insulating coating is formed between the yoke connecting the cylindrical poles of the electromagnetic coil and the electromagnetic coil, thereby completely preventing leakage due to the presence of water or detergent.

As shown in FIG. 1, an electromagnet unit for a water supply valve conventionally used in an automatic washing machine, etc. has an armature that presses a diaphragm 10 of a water supply valve (not shown) toward a valve seat (not shown) by a spring 12. 14, a cylindrical synthetic resin armature guide 16 which incorporates the armature 14 and the spring 12 and guides the armature 14 in the direction of contact with and away from the diaphragm 10; Cylindrical poles 20a, 20b are externally fitted on the armature guide 16 at regular intervals and connected by a yoke 18, and a synthetic resin bobbin 22 is further externally fitted on the cylindrical poles 20a, 20b. It consists of an electromagnetic coil 24 wound around.

A resin cover plate 26 is formed on the electromagnetic coil 24 by molding or it is covered with an insulating tape, while the yoke 18
had been subjected to plating treatment.

Therefore, when an abnormal overcurrent flows through the electromagnetic coil 24 and abnormal heat generation occurs, the resin film on the electromagnetic coil 24 leaches, and leakage occurs between the leached portion and the yoke 18 through water, and the electromagnetic coil 24 There was a risk of poor insulation between the yoke 18 and the yoke 18.

In addition, when molding the resin cover plate 26 as described above, defects such as coil breakage are likely to occur due to the influence of the molding pressure and temperature of the resin, and when processing with insulating tape, the number of processing steps increases and production In addition to poor performance, there were other drawbacks such as the possibility of variations in quality.

Furthermore, the yoke 18 has the disadvantage that it is easily rusted when used in a place with a lot of moisture such as a water supply valve.

The present invention has been made to solve the above-mentioned problems, and its purpose is to provide two cylindrical poles that completely prevent current leakage and have good insulation properties, and that are arranged at a predetermined distance with their axes aligned with each other. It has an electromagnetic coil wound around a bobbin provided on the outer circumferential side of the cylindrical pole, and has an armature guided by an armature guide on the inner circumferential side of the cylindrical pole. In an electromagnet unit that has a U-shaped yoke that connects the lower end and is attached to a valve body such as a water supply valve, all parts that are exposed to the outside when attached to the valve body, except for the terminals of the electromagnetic coil, are An object of the present invention is to provide an electromagnet unit characterized by being coated with a resin coating.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail below based on the accompanying drawings.

In FIG. 2, the general reference numeral 30 is an electromagnet unit which is screwed to the water supply valve 32 with a screw 34.

Reference numeral 36 denotes an armature, which is housed in a cylindrical armature guide 38 that is open downward, and is moved downward by a spring 40 interposed between the top of the armature guide 38 and the inner top wall of the armature guide 38. The diaphragm 42 of the water supply valve 32 is energized to the valve seat 4.
It's pressed to 4.

The armature guide 38 has a large-diameter flange portion 46 connected to its lower portion, and an annular portion 48 protrudes from the lower surface of the flange portion 46 .

The annular portion 48 fits tightly into the corresponding circular hole 50 on the water supply valve 32 side, and the diaphragm 42
The periphery is squeezed watertight.

54a and 54b are iron cylindrical poles;
These two cylindrical poles 54a and 54b are arranged on the outer periphery of the armature guide 38 at a constant interval in the vertical direction.

56 is the yoke bottom plate, and the armature guide 3
The lower end of the lower cylindrical pole 54b is fitted into and connected to a circular hole 58 which is disposed in contact with the upper surface of the flange portion 46 of No. 8 and is provided approximately at the center thereof.

Electromagnetic coil terminals 60a, 6 are provided on the yoke bottom plate 56.
A notch 62 for 0b placement is provided, and the screw 34 insertion hole 64 is bored at a circumferential angle of 120° on a circumference centered on the axis of the armature guide 38 at its periphery.

66 is an inverted L-shaped yoke, and the upper end of the upper cylindrical pole 54a fits into a circular hole 68 provided in the horizontal part, and a protrusion 72 protruding from the lower end of the vertical part 70 is connected to the opposite notch part 62. The upper and lower cylindrical poles 54a and 54b are connected to the yoke bottom plate 56 in a U-shape by engaging the square hole 74 formed on the side yoke bottom plate 56.

76 is a bobbin, which has upper and lower cylindrical poles 54a,
The cylindrical poles 54a, 5 cover the outer surface of 54b.
The circumferential groove 77 is continuous with the outer surface of the armature guide 38 at the interval 4b, and is recessed at this portion by approximately the thickness of the cylindrical poles 54a and 54b.

A flange portion 78 that contacts the horizontal lower surface of the yoke 66 is formed at the upper end of the bobbin 76, and a flange portion 80 that contacts the upper surface of the yoke bottom plate 56 is formed at the lower end.

82 is a coil wound on the bobbin 76.

The bobbin 76 (including the flange portion 78 and the flange portion 80) and the armature guide 38 (including the flange portion 46 and the annular portion 48) hold the upper and lower cylindrical poles 54a, 54b and the yoke bottom plate 56 at predetermined positions. Further, the terminals 60a and 60b are arranged in the notch 62 of the yoke bottom plate 56 without contacting the yoke bottom plate 56, and are integrally insert-molded.

In this case, the terminals 60a, 60b are fixed in a resin plate 84 that is continuous with the flange portion 46 of the armature guide 38 and the flange portion 80 of the bobbin 76.

A small hole 86 is formed in each of the upper and lower cylindrical poles 54a and 54b, and a small hole 88 is also formed in the yoke bottom plate 56 to form a resin bridge by insert molding to firmly fix each member. is preferable.

After integrally molding in this way, the coil 82 is wound on the bobbin 76 and connected to the terminals 60a and 60b.
Further, as described above, the yoke 6 is
6.

In the present invention, the electromagnet unit formed as described above is powder-coated with epoxy or Apply the resin.

It goes without saying that powder coating may be replaced by other appropriate coating treatments such as dipping or spraying.

As described above, according to the present invention, since the exposed parts are coated with resin, it is possible to effectively prevent rusting on the exposed metal parts of the yoke and the yoke bottom plate. Since the coating film is formed on the surface of the electromagnetic coil, even if the coating film on the electromagnetic coil surface is destroyed due to abnormal overcurrent flowing through the electromagnetic coil and abnormal heat generation, there is a risk of poor insulation between the electromagnetic coil and the yoke. Therefore, even if the coating film is formed thinly, it has a sufficient insulating effect and is economical.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional electromagnet unit. FIG. 2 is a sectional view of the electromagnet unit according to the present invention, FIG. 3 is an exploded perspective view of a yoke and a cylindrical pole, and FIG. 4 is a perspective view showing an insert molded state.
FIG. 5 is a perspective view of the coil wound state, and FIG. 6 is a perspective view showing an example of the water supply valve. 10...Diaphragm, 12...Spring, 14
... Armature, 16... Armature guide, 18...
Yoke, 20a, 20b...Cylindrical pole, 22...Bobbin, 24...Electromagnetic coil, 26...Resin cover plate, 30...
Electromagnet unit, 32... Water supply valve, 34... Screw, 3
6... Armature, 38... Armature guide, 40
... Spring, 42 ... Diaphragm, 44 ... Valve seat, 46 ... Flange part, 48 ... Annular part, 50 ... Circular hole, 52 ... Flange part, 54a, 54b ... Cylindrical pole, 5
6...Yoke bottom plate, 58...Circular hole, 60a, 60b...
Electromagnetic coil terminal, 62...notch, 64...insertion hole,
66...Yoke, 68...Circular hole, 70...Vertical part, 72
...Protrusion, 74...Square hole, 76...Bobbin, 77...Peripheral groove, 80...Flange portion, 82...Coil, 84...Resin plate, 86, 88...Small hole.

Claims (1)

[Claims] 1 It has two cylindrical poles arranged at a predetermined interval with their axes aligned with each other, and has an electromagnetic coil wound around a bobbin provided on the outer circumferential side of the cylindrical pole. In an electromagnet unit that is attached to a valve body such as a water supply valve, it has an armature guided by an armature guide on the inner circumferential side of the valve, and a U-shaped yoke that connects the upper and lower ends of the cylindrical pole. An electromagnet unit characterized by coating all parts exposed to the outside with a resin coating except for the terminals of the electromagnetic coil when attached to the main body.