JP2001317648A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small solenoid valve reduced in the number of part items. SOLUTION: A central part of a yoke 11 covering an outer side of a bobbing 12 around which a coil 13 is wound is formed into a deeply drawn part 11D. This deeply drawn part 11D opposes to a movable plunger 14, which drives a valve element 19. A packing 18 attached to the deeply drawn part 11D prevents the generation of noise generated when the movable plunger 14 collides.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve, and more particularly to a solenoid valve which can be downsized.

[0002]

2. Description of the Related Art FIG. 5 is a sectional view showing a conventional solenoid valve. In the drawing, 1 is a yoke, 2 is a plate, 3 is a movable plunger, 4 is a fixed iron core, 5 is a valve seat, 6 is a spring, 7 is a bobbin, 8 is a solenoid coil, 9 is a lead wire, 10 is an O-ring, P1 Is an input hole, and P2 is a discharge hole.

Next, the operation of the solenoid valve having such a configuration will be described. When an electric current is applied to the solenoid coil 8 through the lead wire 9, the yoke 1, the plate 2, the movable plunger 3, and the fixed iron core 4 form a magnetic circuit, and the fixed iron core 4 is excited to move the movable plunger 3 against the spring 6. And let the fixed iron core 4 suck it. When the current flowing through the solenoid coil 8 is stopped, the fixed core 4 releases the movable plunger 3, and the movable plunger 3 is pushed forward by the elastic force of the spring 6. In this manner, the input hole P1 is opened and closed by the tip of the movable plunger 3 in response to the energization and de-energization by the solenoid coil 8. Therefore, when the valve is opened, the control fluid flows in from the input hole P1 and flows out from the discharge hole P2.

[0004]

In such a conventional solenoid valve, a fixed iron core 4 for sucking the movable plunger 3 is required, the number of parts is large, the cost is high, and it is a factor that hinders miniaturization. I was Further, there is a problem that the noise when the movable plunger 3 hits the fixed iron core 4 is large. In view of the above, it is an object of the present invention to provide a solenoid valve that can reduce the number of components by eliminating the need for a fixed iron core and prevent noise when the movable plunger hits the fixed iron core.

[0005]

In order to achieve the above object, a solenoid valve according to the present invention comprises: a cylindrical bobbin wound with a coil; a movable plunger disposed inside the bobbin; It consists of a yoke arranged outside,
A part of the yoke has a shape disposed inside the bobbin and opposed to the plunger.

In a preferred aspect, the shape is a deep drawing portion of the yoke. Further, in a preferred aspect, the plunger has a valve portion at a tip end opposite to a surface facing the yoke, and has a coil spring locked between the valve portion and the bobbin. .

In another preferred embodiment of the present invention, the tip of the plunger is a tapered portion.
In still another preferred aspect, the deep drawing portion includes a packing. In a preferred aspect of the present invention, the valve portion is formed by integrating a metal plate and an elastic body coated on the metal plate.

[0008] The solenoid valve according to the present invention thus configured has a shape in which a part of the yoke is a fixed iron core.
Since the number of parts is reduced and the shape of the yoke is provided with packing, noise can be prevented. Further, since the coil spring is locked between the valve portion and the bobbin, each component such as the bobbin and the plunger can be integrally held until assembly, and the above components are not separated, so that the assemblability can be improved. . Further, it is possible to realize an electromagnetic valve in which the assemblability of the valve portion is improved and the number of parts is reduced.

[0009]

FIG. 1 is a sectional view showing an embodiment of a solenoid valve according to the present invention. In the figure, 11 is a yoke, 12 is a bobbin, 13 is a coil, 14 is a movable plunger, 15 is a plate, 16 is a spring, 17 is a holding plate, 18 is packing, 19 is a valve element, and 20 is a lead wire. The yoke 11 of the illustrated embodiment is arranged outside the cylindrical bobbin 12 around which the coil 13 is wound, and the center of the yoke 11 has the shape of a deep drawing portion 11D. The deep drawing portion 11D of the yoke 11 is provided on the inside of the cylindrical bobbin 12 so as to oppose one end of the movable plunger 14 existing on the inside. The packing 18 is locked to the deep drawing portion 11D, and the packing 18 exists between the deep drawing portion 11D and one end of the plunger 14. The end 11E of the yoke 11 is connected to the end 15E of the plate 15.
And fixed by caulking. The plunger 14 penetrates a central portion 15C of the plate 15.

A step portion 14F is formed at the other end of the plunger 14, and a holding plate 17 is fixed to the step portion 14F by swaging. A resin or rubber valve body 19 is mounted on the holding plate 17 to form a valve portion. This mounting is performed by engaging the disc-shaped holding plate 17 with a concave portion 19C formed in the disc-shaped valve body 19.

A spring 16 is mounted on the outer periphery of the movable plunger 14, and the spring 16 exists between the bobbin 12 and the holding plate 17. One end of the spring 16 is a step formed at the end of the bobbin 12. Locked to the part 12F,
The other end of the spring 16 contacts the holding plate 17.

Further, the spring 16 is connected to the plunger 1.
4 is mounted along a tapered portion 14S formed near the step portion 14F.

In the solenoid valve configured as described above, when a current is applied to the coil 13 by the lead wire 20, the yoke 11, the plate 15, the movable plunger 14, and the deep drawing portion 11D of the yoke 11 form a magnetic path, Restrictor 11D
Performs the same operation as the fixed iron core of the conventional solenoid valve,
The deep drawing portion 11D is configured such that the movable plunger 14 is
Suction is sucked into the deep drawing portion 11D in opposition to 6. As a result, the valve element 19 separates from the seat portion (not shown), and the predetermined fluid flows. Next, when the energization of the lead wire 20 is stopped, the deep drawn portion 11D releases the movable plunger 14, and the valve body 19 is pressed against the seat portion by the spring 16, and the flow of the predetermined fluid is stopped. When the valve body 19 comes into contact with or separates from the seat portion, a fixed iron core as in the configuration of the conventional solenoid valve is not required, and the packing 18 acts as a sound absorbing cushioning material, thereby preventing generation of noise.

Further, in the solenoid valve according to the present invention, the valve portion including the holding plate 17 and the valve element 19 is not limited to the configuration of the embodiment shown in FIG. The configuration can also be adopted.

FIG. 3 is a sectional view showing a valve portion of the solenoid valve according to the present invention, in which a holding plate 17A which is a metal disk and a valve body 19A using a rubber or resin layer which is an elastic body. For example, the valve body 19A of a rubber layer is integrally formed with the plunger 1
4 is fixed by caulking at a caulking portion 14G formed at the other end of the plunger 14 so that the valve portion 20 including the holding plate 17A and the valve body 19A is connected to the caulking portion 1 of the plunger 14.
4F, and the spring 16 is held between the bobbin 12 and the valve section 20. The holding plate 17
A and the valve element 19A are integrated by coating or bonding a rubber material on the surface of the metal plate, and foamed rubber or ordinary sheet rubber is used as the rubber material. With this configuration, it is possible to reduce the number of assembly steps, improve the assemblability, and realize a solenoid valve with a reduced number of parts.

FIG. 4 is a sectional view showing another configuration of the valve portion of the solenoid valve according to the present invention. Only the configuration of the valve portion is different from the embodiment shown in FIG. 3, and the other configuration is the same. Therefore, the same portions are denoted by the same reference numerals and description thereof will be omitted. In FIG. 4, the valve portion 20 ′ is integrated on both surfaces of a holding plate 17 </ b> B which is a metal plate, for example, by coating a rubber layer serving as a valve body 19 </ b> B. By being caulked and fixed to the step portion 14F,
The valve part 20 ′ is fixed to the plunger 14. Also in the present embodiment, it is possible to realize a solenoid valve with a reduced number of parts, which has reduced assembly man-hours and improved assemblability.

In the solenoid valve according to the present embodiment,
A spring 16 mounted on the movable plunger 14 as shown in a partially enlarged view of FIG. 2 is locked by a locking portion 12F formed at one end of the bobbin 12, and is firmly fixed by the tapered portion 14S of the movable plunger 14. It is held between 12 and the holding plate 17. Therefore, the spring 1
According to 6, the components such as the bobbin 12 and the movable plunger 14 are held together without being separated until assembly, so that a solenoid valve with good assemblability can be obtained.

[0018]

As described above, according to the present invention, since the fixed core is formed by the yoke, the fixed core is not required as a separate part, the number of components can be reduced, and the movable plunger can be operated. In addition, noise associated with the operation of the movable plunger can be reduced. In addition, since the coil spring is attached to the outside of the movable plunger and the coil spring is locked to the bobbin, the assemblability of the solenoid valve can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a solenoid valve according to the present invention.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a cross-sectional view showing another embodiment of the main part of the solenoid valve according to the present invention.

FIG. 4 is a sectional view showing another embodiment of a main part of the solenoid valve according to the present invention.

FIG. 5 is a sectional view showing a configuration of a conventional solenoid valve.

[Explanation of symbols]

 Reference Signs List 11 yoke 12 bobbin 13 coil 14 movable plunger 15 plate 16 coil spring 17 holding plate 18 packing 19 valve body 20 lead wire

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H052 AA01 BA25 BA26 BA33 CA18 CA19 3H106 DA07 DA13 DA23 DB02 DB12 DB23 DB32 DC02 DC17 DD03 EE20 EE34 EE35 GA11 GA13 GA15 GA23 GB06 GC09 JJ02

Claims (7)

[Claims] 1. A bobbin in which a coil is wound, a movable plunger arranged inside the bobbin, and a yoke arranged outside the bobbin, a part of the yoke being part of the bobbin An electromagnetic valve, characterized in that it has a shape disposed opposite to the plunger inside the inside. 2. The solenoid valve according to claim 1, wherein the shape is a deep drawing portion of the yoke. 3. The solenoid valve according to claim 2, wherein the deep drawing portion includes a packing. 4. The plunger has a valve portion at a tip end opposite to a surface facing the yoke, and has a coil spring locked between the valve portion and the bobbin. Item 7. The solenoid valve according to Item 1. 5. The solenoid valve according to claim 4, wherein a tip portion of the plunger is a tapered portion. 6. The solenoid valve according to claim 4, wherein the valve portion is formed integrally with a metal plate and an elastic body coated on the metal plate. 7. The solenoid valve according to claim 4, wherein the valve portion comprises a holding plate and a valve body mounted on the holding plate.