JPH01188777A - Fluid control valve and manufacture thereof - Google Patents

Abstract

PURPOSE:To improve the operation stability and durability of a control valve by forming a valve body with a piston made of a thermoplastic resin and a rubber diaphragm which is bonded by vulcanization to the end portion of the piston. CONSTITUTION:The end portion with unevenness of a piston 12 made of a thermoplastic resin having high heat resistance is coated with a rubber vulcanizing adhesive composed of a natural rubber type rubber adhesive and dried and, then, the piston 12 is placed in position in a diaphragm molding die. A preheated rubber material such as ethylene propylene, etc., having high chemical resistance is introduced from an injecting gate into a molding cavity and subjected to vulcanization for a defined time and, after that, the molding die is separated to take out the piston 12. Thereby, no dispersion will occur in the degree of bonding of the diaphragm 10 to the piston 12, enabling uniform and strong bonding.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a fluid control valve that switches the passage of the valve by pressing the valve body against the valve seat or separating it from the valve seat, and a method for manufacturing the same. be.

[Conventional technology]

In a fluid control valve, when the valve body consists of a resin piston and a rubber diaphragm, conventionally, the tip of the piston is coated with an adhesive such as cyanoacrylate to bond the diaphragm and piston together. It had become

On the other hand, since a fluid control valve is a basic element constituting a fluid circuit, it is required to have extremely high quality such as operational stability and durability, and is also desired to be low in price.

[Problem that the invention seeks to solve]

However, when a diaphragm and a piston that have been manufactured in advance are manually bonded together later, as in the conventional method, there are the following problems.

(a) There may be variations in the degree of adhesion, or the elasticity of the diaphragm may deteriorate near the piston, which may cause the diaphragm to separate from the piston or tear off, which may affect the operational stability and durability of the fluid control valve. This results in a decline in quality.

(c) Since the bonding work takes time and the process cannot be simplified, the cost is high and the price cannot be reduced.

The present invention was made in order to solve the above problems, and aims to provide a high quality and low cost fluid control valve and a method for manufacturing the same.

[Means for solving problems]

In order to achieve the above object, the fluid control valve of the present invention includes a valve body capable of reciprocating linear movement, a cylinder 26, 32 in which the valve body slides, and a cylinder having a plurality of passages and fixed to the cylinder. It includes a manifold 40 attached to the cylinder and a control signal introduction part 34 provided in the cylinder, and by turning a control signal on or off to the control signal introduction part, the valve element moves and the valve seat 46 of the manifold is moved. In a fluid control valve in which a passage provided in a manifold is opened/closed and switched by being moved apart or pressed, a valve body is vulcanized and bonded to a piston 12 made of thermoplastic resin and the tip of this piston. It consists of a diaphragm 10 made of rubber.

The method for manufacturing the above-mentioned fluid skewer valve includes applying a rubber vulcanizing adhesive to the tip of the piston 12 and drying it.
A suitable method is to place the piston 12 in a diaphragm mold, mold and vulcanize the diaphragm, and simultaneously vulcanize and bond the diaphragm 10 to the tip of the piston 12 using an adhesive.

[For production]

When the rubber material is heated and vulcanized, the diaphragm is formed and vulcanized, and at the same time, the diaphragm 10 is evenly and firmly vulcanized and bonded to the piston 12. The fluid control valve using the diaphragm 10 and the piston 12 obtained in this way is such that when the piston 12 moves in either direction depending on the presence or absence of a control signal from outside the valve, the diaphragm 10 bonded to the tip of the piston also moves. As it moves, the diaphragm moves away from or against the valve seat 46 of the manifold 40 to open or close passageways in the manifold and control the flow of fluid through the passageways.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. However, unless there is a specific description, the materials, shapes, relative positions, etc. of the components described in this example are not intended to limit the scope of the present invention to these, but are merely illustrative. Just an example.

FIG. 1 is a cross-sectional view of the fluid control valve (cross-sectional view taken along the line A-A in FIG. 2), and FIG. 2 is a partially cutaway plan view of the manifold.

An umbrella-shaped diaphragm 10 is bonded to the tip of the piston 12. The production of the diaphragm and the gluing of the diaphragm to the piston is carried out - by way of example - as follows. In other words, the tip of the piston 12 made of a thermoplastic resin such as nylon 46, which has good heat resistance, has an uneven surface.
After applying and drying a rubber vulcanizing adhesive made of a natural rubber-based rubber adhesive, the piston 12 was placed in a predetermined position in the diaphragm mold, and the piston 12 was preheated from the injection gate to the molding cavity. A rubber material such as ethylene-propylene with good chemical resistance is introduced and vulcanized for a predetermined period of time.The mold is then separated and the piston 12 is taken out. It is vulcanized and bonded to the tip of the piston 12 via a sulfur adhesive. The diaphragm 10 is evenly and firmly bonded to the piston 12.

Since the tip of the piston 12 is provided with unevenness,
The bond between the two becomes even stronger.

Further, the piston 12 is fitted into a hole 16 provided inside the small diameter portion 18 of the piston 14, which has a small diameter portion 18 and a large diameter portion 20, and is integrated. A backing 21 is attached to the outer periphery of the large diameter portion 20.

A recess 22 is provided inside the large diameter portion 20, and a spring 24 is fitted into the recess 22. In FIG. 1, the inner diameter of the upper part of the recess 22 is approximately the same as the outer diameter of the spring 24, and the lower part of the recess 22 is formed with a tapered part 23, which becomes larger than the outer diameter of the spring 24 toward the lower part. Therefore, the spring 24 is caught in the upper part of the recess 22, and the spring 24 does not fall even if the piston is lifted, which is convenient during assembly. Since the lowermost part of the recess 22 has a larger periphery cut out, the spring 24 can be easily pinched by hand, and the spring 24 can be easily attached to and removed from the recess 22.

Further, the small diameter portion 18 of the piston 14, which is integrated with the diaphragm 10 and the piston 12, is inserted into the inside of the cylinder 26, which has a backing 30 attached to its inner periphery and a sealing material 28 attached to its outer periphery.

As described above, the spring 24 is disposed between the bottom of the cylinder 32 and the recess 22 of the piston 14, and the large diameter portion 2
The piston 14 is inserted into the cylinder 26.32 such that the outer circumference of the small diameter section 18 slides on the inner circumference of the cylinder 26 via the backing 21 and the outer circumference of the small diameter section 18 slides on the inner circumference of the cylinder 26 via the backing 30. The cylinder 26 is placed in the cylinder 32 such that the outer periphery is in contact with the inner periphery of the cylinder 32 via the sealing material 28 .

The cylinder 32 is provided with a control signal introduction part 34 that communicates with the inside of the cylinder 32, and a rainbow pull 36 is connected continuously to the control signal introduction part 34 via a sealing material 38.

On the other hand, a passage 42.4 for fluid such as liquid or gas to flow
A manifold 40 is provided with a nipple 48 and a nipple 52 through a sealing material 50 and a nipple 52 through a sealing material 54 following the passages 42 and 44, respectively. It is attached to the cylinder 32 with set screws 56 and 58. The cylinder 26.32 has a piston 12
．． In order to be able to quickly move up and down in 14,
Vent holes 31, 33 communicating with the atmosphere are provided in each case.

In this embodiment, air pressure is used as the control signal for the valve. When compressed air is not supplied to the control signal introduction part 34, the piston 12 is
．． 14 is pushed upward, and the diaphragm 10, which is glued to the piston 12, is pressed against the valve seat 4 of the manifold 40.
6, the passage 42 and the passage 44 are blocked.

When compressed air is supplied to the control signal introduction section 34, the piston 12.14 is pushed downward against the force of the spring 24, the diaphragm 10 is separated from the valve seat 46 of the manifold 40, and the passages 42 and 44 are separated. We communicate with each other.

If the piston 12.14, cylinder 26.32, manifold 40, and nipple 36.48.52 are manufactured by resin molding, the unit cost of the parts can be significantly reduced by mass production. Further, the nipple and the manifold, and the nipple and the cylinder can be integrally molded with resin, thereby further reducing costs.

The material of the piston 12 is not limited to nylon 46, but any material that can withstand the molding and vulcanization of the diaphragm 10 may be used, and other thermoplastic resins may also be used. diaphragm 10
is not limited to ethylene-propylene rubber, but other rubber materials such as nitrile rubber and chloroprene rubber can also be used depending on the usage conditions, for example, the type of fluid.

Further, the method of vulcanizing the diaphragm is not limited to injection molding vulcanization, but may also be compression vulcanization or transfer vulcanization.

In this embodiment, a case has been described in which air pressure is used as a control signal for the valve, but it is also possible to use other fluid pressure such as hydraulic fluid instead of air pressure.

〔Effect of the invention〕

As explained above, in the fluid control valve of the present invention, the valve body consists of a diaphragm and a piston, and the rubber diaphragm is molded in a mold and vulcanized, and at the same time, the diaphragm is vulcanized and bonded to the resin piston. Since it is composed of the following, it has the following nurturing effects.

(a) There is no variation in the degree of adhesion between the diaphragm and the piston, and the adhesion is uniform and strong, so the diaphragm will not come off the piston or tear (it will improve the operational stability and durability of the fluid control valve). etc. quality will be significantly improved.

(b) Since the process of bonding the diaphragm and piston can be simplified, process control can be improved, the unit cost of parts can be reduced, and a low-cost fluid control valve can be provided.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view showing one embodiment of the fluid control valve of the present invention (a cross-sectional view taken along the line A-A in Fig. 2), and Fig. 2 is a plan view with a part of the manifold cut away in Fig. 1. It is a diagram.

Claims (1)

[Claims] 1. A valve body capable of reciprocating linear movement, a cylinder in which the valve body slides, a manifold having a plurality of passages and fixedly attached to the cylinder, and a manifold provided in the cylinder. By turning a control signal on or off to the control signal introduction part, the valve body moves and leaves or presses against the valve seat of the manifold, opening and closing the passage provided in the manifold. A fluid control valve in which the passage is switched, the valve body comprising a piston made of thermoplastic resin and a diaphragm made of rubber vulcanized and bonded to the tip of the piston. 2. In manufacturing the fluid control valve according to claim 1, after applying a rubber vulcanizing adhesive to the tip of the piston and drying it, the piston is placed in a mold for diaphragm molding, and the diaphragm is molded and vulcanized. At the same time, a diaphragm is vulcanized and bonded to the tip of the piston via an adhesive.