JPH085423Y2 - Control valve structure - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an improvement of a swing type valve part structure for the purpose of improving the shut-off property when the valve is closed.

[Conventional technology]

FIG. 2 is a cross-sectional view showing a conventional valve portion structure in an electromagnetic valve in which the plunger 20 is provided at the center of the electromagnetic coil 42 arranged annularly. The stem 23 is fixed to the tip of the plunger 20 by screwing. And has a spherical surface portion 25 for swinging at the tip of the stem 23 and a flat portion for returning on the back surface of the spherical surface portion 25.
A head 24 having a 26 is integrally formed.

The head 24 includes a bottom wall 32 of a head accommodating chamber 30 provided with the valve element 29 and a lock nut screwed into the head accommodating chamber 30.
It is held between 37 so as to be free to move in the axial and swing directions.

That is, the valve element 29 has a substantially cylindrical shape, and the head accommodation chamber 30 is formed concentrically from one end which becomes the plunger spring receiver 33,
A female screw part for screwing a lock nut on the inner wall of the head accommodating chamber 30.
34 is formed, and the crown portion 31 of the valve rubber 35 is formed at the other end.

Further, the lock nut 37 has an inner diameter 38 larger than the outer diameter 27 of the stem 23, and a male screw portion 39 on the outer circumference.
In addition, the locking brim portion 31 is formed.

Then, the valve body 36 is pressed against the valve seat 22 by the pressing force of the plunger spring 19 to shut off the fluid.
When the parallelism between the valve seat 36 and the valve seat 22 is poor, or when dust or the like is attached to the valve seat 22, the valve body 36 swings around the spherical surface portion 25 of the stem head 24 as a fulcrum and the valve seat 22 It is possible to maintain close contact with.

The swing angle of the valve body 36 is the clearance formed by the outer diameter 27 of the stem and the inner diameter 38 of the lock nut, and the length 40 of the contact portion in the axial direction.
It is determined by the interaction (depending on the length of the lock nut 37).

In the conventional valve structure, the lock nut 37 is used as the valve body.
Due to the structure of being screwed and fastened to 29, the screw insertion length 41a and the tightening portion length 41b are required, and the contact portion length 40 tends to be long.

Therefore, the clearance must be set large, and the head diameter 28 needs to be increased to prevent the stem 23 from coming off.

However, press molding is impossible as a method for processing the head diameter 28 to a large extent, and there is a drawback in that the cost is high because it is manufactured by shaving.

Further, there is a problem that the structure is enlarged due to the lock nut 37 having a complicated shape, and the cost of component parts and the cost required for assembly are high.

[Problems to be solved by the device]

The present invention has been made in view of the above points, and an object thereof is to provide a valve portion structure of a control valve which is manufactured at a reduced cost and is downsized.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a stem at the tip of a plunger that can move up and down in the control valve body, and forms a head having a swinging spherical portion at the tip of the stem and has a diameter larger than the stem diameter. A valve body having a large diameter stem insertion hole is swingably provided on the head portion, and a plunger spring is elastically provided between the valve body and the control valve body to connect the flat plate-shaped bottom plate portion to the bottom plate portion. The valve body is composed of a rigid valve body composed of a formed tubular portion and a flange portion connected to the tubular portion, and a valve rubber fitted to the flange portion. In the control valve, the stem insertion hole is formed in the bottom plate portion, the height of the tubular portion is formed higher than the height of the head portion, and the swinging spherical portion of the head portion is formed in the tubular portion. An axial gap is formed between the head portion and the bottom plate portion in a state of being close to the valve rubber, and when the valve is opened, the head portion runs idle within the range of the axial gap and the bottom plate Characterized in that it abuts the.

[Action]

When the valve head opens, the stem head runs idle in the gap in the axial direction and abuts against the bottom plate of the valve element, causing the valve element to move shockingly in the opening direction, and the valve rubber that is in close contact with the valve seat. Will be separated instantly.

〔Example〕

FIG. 1 is a sectional view showing a valve portion structure of the present invention in a solenoid valve. A female screw portion 21 is provided at the center of the tip of a plunger 20, and a male screw portion formed on one side of the stem 1 in the female screw portion 21. 8 is fixed by screwing.

On the other side (tip) of the stem 1, a head 2 having a swinging spherical surface portion 3 and a returning flat portion 4 on the back side of the spherical surface portion 3 is integrally press-molded with the stem 1. .

The outer diameter 6 of the head 2 is formed to be smaller than the conventional one.

The stem 1 is provided with a valve body 9 having a stem insertion hole 11 at the center, which is set to be slightly larger than the outer diameter 5 of the stem, facing the flat portion 4 of the head 2.

The valve element 9 is formed by press-molding a flat plate metal material so that a short cylindrical portion 7 is connected to a bottom plate portion 43 having a stem insertion hole 11, and the cylindrical portion 7 has a collar portion 10 for pressing a valve seat. The height of the cylindrical portion 7 is set to be slightly larger than the head height 7'of the stem 1 to form a clearance 15 in the axial direction.
The valve rubber 16 is attached to the inner wall 17 of the valve rubber 16 and the valve body 9
The valve body 18 through the head 2 of the stem 1 between the head contact surfaces 13 of the
Is provided so as to be movable in a certain range in the swing direction and the axial direction.

The thickness of the valve body 9 is much thinner than that of the lock nut 37 used in the conventional valve portion structure, and the clearance formed by the stem insertion hole 11 and the stem outer diameter 5 is set smaller than the conventional one.

Therefore, even if the head diameter 6 of the stem 1 is set small, there is no concern that the head 2 will be inserted into or removed from the stem insertion hole 11 of the valve body 9.

Further, since the valve element 18 has a swinging action, it is possible to improve the adhesion even when the parallelism with the valve seat 22 is poor when the valve is closed or dust or the like is attached to the valve seat 22.

Further, since the valve body 18 also has the clearance 15 in the axial direction, when the valve is opened, the flat portion 4 of the stem head 2 runs idle in the clearance 15 so that the abutting surface 13 of the valve body 9 is struck. The valve body 18 that is in close contact with the valve seat 22 is momentarily separated from the valve seat 22, and when the valve is closed, the spherical surface portion 3 impacts the valve rubber 16 to increase the close contact with the valve seat 22.

[Effect of device]

As described above, according to the present invention, when the valve head opens, the head of the stem runs idle and collides with the valve body, and instantly separates the valve rubber that is in close contact with the valve seat. Is improved, the valve opening time is shortened, and the valve opening operation is reliably performed.
Also, because the valve opening force is obtained by utilizing the free running of the stem head,
The control valve body including the plunger can be downsized, and the manufacturing cost can be reduced in combination with the pressing of the valve body.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a valve portion structure of the present invention, and FIG. 2 is a vertical sectional view showing a conventional valve portion structure. 1 ... Stem, 2 ... Head, 3 ... Spherical part, 11 ... Stem insertion hole, 18 ... Valve body, 20 ... Plunger, 22 ... Valve seat, 7 ... Cylindrical part, 9 ... … Valve body, 10 …… Tsubabe, 16 ……
Valve rubber, 43 ... Bottom plate part.

Claims (1)

[Scope of utility model registration request] 1. A stem is provided at the tip of a plunger that can move up and down in the control valve body, a head having a swinging spherical surface portion is formed at the tip of the stem, and a stem insertion hole having a diameter larger than the stem diameter is provided. A valve body is swingably provided on the head portion, a plunger spring is elastically provided between the valve body and the control valve body, and a flat plate-shaped bottom plate portion and a cylindrical portion connected to the bottom plate portion are provided. In the control valve, the valve body is composed of a rigid valve element composed of a flange part connected to the tubular part, and a valve rubber fitted to the flange part. In the state where the stem insertion hole is formed, the height of the cylindrical portion is higher than the height of the head, and the swinging spherical portion of the head is close to the valve rubber in the cylindrical portion. An axial gap is formed between the head portion and the bottom plate portion, and when the valve is opened, the head portion runs idle within the range of the axial gap and collides with the bottom plate portion. The valve structure of the control valve.