JPH05126265A - Fluid controller - Google Patents

Abstract

PURPOSE:To improve durability by forming a diaphragm into a laminated structure comprising a rubber elastic unit and hard resin layers of corrosion resistance formed on both sides of this rubber elastic unit, in a device of fixing the diaphragm through a holding member in a position opposed to a seal seat of a valve main unit. CONSTITUTION:By introducing air into an air passage 10 from an inlet port 9, a stem 4 and a compressor 3 are lifted through a spring 7 to connect an inlet flow path 21 to an outlet flow path 22 by detaching a diaphragm 8 from a seal seat 23. In a fluid controller 1 thus obtained, the diaphragm 8 is formed of a laminated structure comprising a rubber elastic unit 81 and hard resin layers 82 of corrosion resistance preferably of polytetrafluoroethylene formed on both sides of this rubber elastic unit. In the diaphragm 8, its peripheral edge part 801 is formed into a small thickness part, and in a holding member 5 for holding this diaphragm peripheral edge fastened, a notched part 501 is formed in a contact part with the peripheral edge part 801 to improve its fastening effect.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid controller, and an object thereof is to provide a fluid controller which is easily tightened during use and has excellent durability.

[0002]

2. Description of the Related Art In the case of shutting off chemicals such as acids, a heat-resistant rubber diaphragm valve is used as a fluid controller, which hardly gives a resistance to the flow of fluid and is free from corrosion. There is. This diaphragm valve has a valve body (A) and stem (B), diaphragm (C), bonnet (D), spring (E), compressor (F), cap (G ) And. Valve body (A)
An inlet passage (A1), an outlet passage (A2), and a seal seat (A3) located in the middle of these passages are formed in this.

A diaphragm valve having such a structure
At (Z), the air passage from the inlet port (J)
Air is introduced through (I) to move the compressor (F) fixed to the lower end of the stem (B) upward. By the vertical movement of the compressor (F), the diaphragm (C) is pressed against or separated from the seal seat (A3) of the valve body (A) to open and close the inlet flow passage (A1) and the outlet flow passage (A2).

In this way, the diaphragm (C) is
In a diaphragm valve (Z) that has a structure that closes the flow paths (A1) and (A2) by pressing it against (A3), close contact between the diaphragm (C) and the seal seat (A3) is required. A rubber elastic body is generally used for the diaphragm (C) or the seal seat (A3). However, if a diaphragm (C) made of a rubber elastic body is used, the adhesion with the seal seat (A3) will be improved, but since it is an elastic body, it will always be used with a load applied, and it will be used for a long time. When it is used, there is a problem that non-plastic deformation occurs in this elastic body, and as a result, phenomena such as aging and breakage occur, and eventually fluid leakage occurs.

In view of these problems, the technology has been improved in recent years, and for the purpose of improving the durability of the diaphragm (C), for example, as shown in an enlarged cross section of FIG. It is usually formed by a laminated structure of a rubber elastic body (H) and a polytetrafluoroethylene resin film (P). Such a diaphragm (C)
In the above, a thin polytetrafluoroethylene resin film (P) having excellent chemical resistance is provided on the side (surface side) of the rubber elastic body (H) which is in contact with the fluid.

[0006]

However, in the above-mentioned conventional diaphragm valve, the polytetrafluoroethylene resin film (P) excellent in chemical resistance and surface smoothness is provided on the side in contact with the fluid (surface side). However, since the side of the diaphragm (C) that is pressed against the seal seat (A3) (rear side) is the rubber elastic body (H), repeated clamping of the diaphragm (C) due to long-term use may cause There was a problem that the rubber elastic body (H) part deteriorates. This rubber elastic body
When the portion (H) deteriorates, the diaphragm (C) itself or the seal seat (A3) will eventually be damaged, causing fluid leakage and impairing the function of the valve.

[0007]

DISCLOSURE OF THE INVENTION In the present invention, a valve body having an inlet passage and an outlet passage, and a seal seat positioned between these two passages, and a holding member at a position facing the seal seat of the valve body. A diaphragm fixed through the diaphragm, and an operation mechanism for pressing or separating the diaphragm from the seal seat. The diaphragm includes a rubber elastic body and corrosion-resistant hard resin layers formed on both sides of the rubber elastic body. The sandwiching member has a thin-walled portion, and the sandwiching member has a notch formed in a contact portion with the diaphragm, and the thin-walled portion of the diaphragm is formed by a protruding portion of the contact portion. By providing a fluid controller characterized by being sandwiched, the above-mentioned conventional drawbacks are eliminated.

[0008]

[Function] Since the diaphragm is formed by the laminated structure of the rubber elastic body and the corrosion-resistant hard resin layers formed on both sides of the rubber elastic body, the adhesion between the diaphragm and the seal seat by the rubber elastic body is improved. While being maintained, both the surface of the diaphragm that contacts the fluid and the surface of the diaphragm that is pressed against the seal seat are formed of a corrosion-resistant hard resin layer, so fatigue and deterioration will not occur even if used for a long period of time. Unlikely to occur. When the flow path is closed, the thin-walled portion at the peripheral edge of the diaphragm is clamped by the protrusion of the contacting portion of the clamp member, so that the clamping force is concentrated on the clamp member protrusion and the diaphragm can be clamped and lowered efficiently. At the same time, the torque can be set when closed. In addition, since the peripheral edge of the diaphragm is formed as a thin portion and has a small thickness, no play is formed between the diaphragm and the abutting portion of the sandwiching member, and both sides have excellent surface smoothness and strength characteristics. Since a hard resin layer having corrosion resistance is formed, effective tightening can be performed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A fluid controller according to the present invention will be described below with reference to the drawings. FIG. 1 is a sectional explanatory view showing an embodiment of a fluid controller (1) according to the present invention. In the figure, (2) is a valve body, and this valve body (2) has an inlet passage (21). And outlet flow path (22)
And a seal seat (23) located in the middle of these two flow paths. (3) is a compressor, (4) is a stem, (5) is a holding member, (6) is an actuator cap, (7) is a spring, and (8) is a diaphragm.

In the fluid controller (1) having such a structure, when the flow paths (21) and (22) are closed, a spring is used.
Lower the compressor (3), which is fixed under the stem (4) by (7). Then the diaphragm (8)
The peripheral edge is clamped and clamped by the tip of the clamping member (5), and is pressed against the seal seat (23) of the valve body (2) to make the inlet flow path.
The (21) and the outlet channel (22) are closed. Also, when air is introduced from the inlet port (9) through the air passageway (10), the compressor fixed under the stem (4)
(3) is raised, the diaphragm (8) is separated from the seal seat (23), and the inlet passage (21) and the outlet passage (22) are opened.

FIG. 1 shows a flow path (21) by a fluid controller (1),
(22) is shown in a closed state, and FIG. 2 is an enlarged partial cross-sectional view showing a tightened state of the diaphragm (8) shown in FIG. As shown in FIG. 2, in the present invention, the diaphragm (8) has a laminated structure including a rubber elastic body (81) and corrosion-resistant hard resin layers (82) formed on both sides of the rubber elastic body (81). It is formed by. In the present invention, as the resin used for the corrosion-resistant hard resin layer (82), a fluororesin having low wear resistance, chemical resistance, and excellent surface smoothness is used, and particularly polytetrafluoroethylene ( PTFE) resin is preferably used.

Further, in the present invention, the diaphragm
The peripheral part (801) of (8) is a thin part, and the clamping member (5) that clamps and clamps the peripheral part of the diaphragm (8) when the diaphragm (8) descends is the peripheral part of the diaphragm (8).
A notch (501) is formed in the contact portion with. In the fluid controller (1) according to the present invention thus formed, when the inlet flow passage (21) and the outlet flow passage (22) of the valve body (2) are closed, the holding member (5) pushes them. The pressure is concentrated on the tip of the protruding part (502), and it is effectively pressed with a small area,
The fluid controller (1) can be tightened easily and securely.

In the present invention, the diaphragm
The size of (8) is smaller than that of the conventional diaphragm. The reason for this is that by providing a hard resin layer (82) with corrosion resistance on both sides of the rubber elastic body (81), the rubber elastic body (81) can be repeatedly opened and closed even if it is not formed thick like a conventional diaphragm. This is because there is no concern that the parts will deteriorate, and by making the diaphragm (8) thin in this way, play does not occur between the diaphragm (8) and the compressor (3) and effective opening and closing operations can be performed.

In the embodiment shown in FIG. 2, the diaphragm is
(8) The thin portion of the peripheral edge (801) is a corrosion resistant hard resin layer (82)
However, in the present invention, as shown in FIG.
As shown in Fig. 7, the thin portion of the peripheral edge portion (801) of the diaphragm (8) may be formed by a laminate of the rubber elastic body (81) and the corrosion resistant hard resin layers (82) provided on both sides thereof. Good.

Further, in the present invention, the fluid controller
(1) is not limited to the embodiment shown in FIG. 1, and is suitably used for any fluid controller of manual type or automatic type.

[0016]

As described above in detail, according to the present invention, a valve body having an inlet passage and an outlet passage and a seal seat located between these passages and a seal seat of the valve body are opposed to each other. The diaphragm is fixed at a position via a holding member, and an operation mechanism that presses or separates the diaphragm from the seal seat. The diaphragm is a rubber elastic body and corrosion resistance formed on both sides of the rubber elastic body. Of the hard resin layer, and its peripheral portion is a thin-walled portion, and the sandwiching member has a notch formed at a contact portion with the diaphragm, and the thin-walled portion of the diaphragm is brought into contact with the notched portion. Since the fluid controller is characterized in that it is sandwiched by the projecting portions, the following effects are obtained.

That is, since the diaphragm is formed by the laminated structure composed of the rubber elastic body and the corrosion-resistant hard resin layers formed on both sides of the rubber elastic body, not only on the side of the diaphragm in contact with the fluid, A layer with excellent strength properties is also provided on the side that receives the pressing force of the sandwiching member, so while maintaining the adhesion by the rubber elastic body, deterioration and fatigue due to repeated opening and closing operations do not easily occur, and excellent durability ing.

Further, since the peripheral edge of the diaphragm is thin and a notch is formed in the diaphragm contact portion of the sandwiching member, the clamping force of the diaphragm when the flow path is closed is concentrated on the protruding portion. Since it is transmitted to the diaphragm, the tightening operation of the fluid controller can be performed easily and surely. Further, since the diaphragm portion of this fluid controller is composed of the rubber elastic body and the corrosion-resistant hard resin layers formed on both sides thereof as described above, even if it is formed to be considerably thinner than the conventional diaphragm. The function is sufficiently exhibited, and since it is formed thinly, it does not play with the compressor. Further, it is possible to set the torque on the sandwiching member. Moreover, since the diaphragm portion is formed thin, when the actuator is actuated, the actuator output is reduced and the entire valve is miniaturized.

[Brief description of drawings]

FIG. 1 is a sectional explanatory view showing an embodiment of a fluid controller according to the present invention.

FIG. 2 is an enlarged partial cross-sectional view of a diaphragm portion when tightening the same as above.

FIG. 3 is a partial cross-sectional enlarged view showing a modified example of a diaphragm portion at the time of tightening.

FIG. 4 is an explanatory sectional view showing an example of a conventional fluid controller.

FIG. 5 is an enlarged partial cross-sectional view of the diaphragm portion when tightening the same as above.

[Explanation of symbols]

 1 Fluid Controller 2 Valve Body 21 Inlet Flow Path 22 Outlet Flow Path 23 Seal Seat 3 Compressor 5 Clamping Member 8 Diaphragm 81 Rubber Elastic Body 82 Corrosion Resistant Hard Resin Layer 801 Peripheral Edge 501 Notch 502 Projection

Claims (3)

[Claims] 1. A valve body having an inlet passage and an outlet passage, and a seal seat positioned between these two passages, and fixed at a position facing the seal seat of the valve body via a sandwiching member. And a diaphragm, and an operation mechanism for pressing or separating the diaphragm from the seal seat, and the diaphragm has a laminated structure including a rubber elastic body and a corrosion-resistant hard resin layer formed on both sides of the rubber elastic body. And a peripheral portion thereof is a thin portion, and the holding member has a notch portion formed in a contact portion with the diaphragm so that the thin portion of the diaphragm is held by a protruding portion of the contact portion. A fluid controller characterized by the above. 2. The fluid controller according to claim 1, wherein the thin-walled portion of the diaphragm is formed by a laminated body including only a corrosion-resistant hard resin layer. 3. The fluid controller according to claim 1, wherein the thin-walled portion of the diaphragm is formed of a rubber elastic body and corrosion-resistant hard resin layers provided on both sides of the rubber elastic body.