JPH05126269A - Diaphragm valve - Google Patents

Abstract

PURPOSE:To provide a diaphragm valve wherein air bleeding in a water purifier and antiseptic solution injecting into the water purifier can be performed in common with a single valve. CONSTITUTION:A diaphragm 2 having a deformable part 6 of thin thickness is arranged closely to a valve seat 5 in a housing 1 of a diaphragm valve having fluid gates 3, 4. One side of the diaphragm 2 is opened to the atmosphere through an opening 8. A closely attached part to the valve seat 5 of the other side communicates with the fluid gate 3. A peripheral part 7 in the deformable part of the other side communicates with the other fluid gate 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diaphragm valve capable of blocking fluid flow under reduced pressure and atmospheric pressure, while allowing fluid flow in both directions under pressure.

[0002]

2. Description of the Related Art In recent years, precision water purifiers using microporous hollow fiber membranes have been used in the medical field and food industry field for the production of sterile water containing no bacteria or pyrodiene.

These precision water purifiers utilize the fact that the porous hollow fiber membrane is excellent in water permeability and its fractionation performance is smaller than the size of these bacteria. In order to supply the raw water to the water purifier provided with such a hollow fiber membrane, an air bleeding mechanism for bleeding the air existing in the water purifier before passing water is required. However, if air flows into the water purifier from the air outlet after each stop, purified water cannot be collected until the inside of the water purifier is filled even if water flow is started. However, there was a problem that water was continuously discharged until the water in the water purifier became empty.

As a method for solving such a problem, a filtration module having a check valve at the air outlet for preventing the intrusion of air from the outside of the housing into the inside (June Sho 63-
No. 26163) is known.

On the other hand, in an apparatus for producing aseptic water used for medical purposes and the like, sterilization of the inside of the apparatus is required because it is necessary to completely eliminate the growth of bacteria in the apparatus. Such sterilization treatment has been carried out by periodically injecting a disinfecting solution such as an aqueous solution of sodium hypochlorite or an aqueous solution of formalin into the apparatus. However, since it is usually necessary to prevent dust from entering from the outside and to block the flow of air, a troublesome operation such as disposing a screw lid etc. as an inlet for the disinfectant and opening it one by one to inject the disinfectant is required. Was needed.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a diaphragm valve having a simple structure which prevents fluid from flowing under reduced pressure and atmospheric pressure, while allowing fluid to flow in both directions under pressure. To provide.

Another object of the present invention is to provide a diaphragm valve which can share the air bleeding inside the water purifier and the injection of the disinfectant solution into the water purifier with one valve.

[0008]

That is, according to the present invention, in a housing having at least two fluid inlets and outlets, a diaphragm having a thin-walled deformable portion is disposed in close contact with a valve seat of one fluid inlet and outlet. , One surface of the diaphragm is open to the atmosphere, the other surface-contacting portion with the valve seat communicates with one fluid inlet / outlet through the inner hole of the valve seat, and the outer peripheral portion of the deformable portion has the other surface. A diaphragm valve that communicates with the fluid inlet and outlet.

[0009]

The diaphragm valve of the present invention is provided with a diaphragm having a thin-walled deformable portion that can be deformed by a slight force. When the pressure at the fluid inlet / outlet is reduced or atmospheric pressure, the diaphragm is in close contact with the valve seat and the fluid is blocked from flowing. On the other hand, when the pressure at any one of the fluid inlets becomes higher than the atmospheric pressure, the deformable portion of the diaphragm is deformed by the pressure and the diaphragm is pushed up from the valve seat, and the fluid flows from the fluid inlet / outlet where the pressure increased to the valve seat. Flow toward the fluid inlet / outlet with the lower pressure.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A diaphragm valve of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic sectional view showing an example of the diaphragm valve of the present invention. A diaphragm 2 is arranged in the housing 1. The housing 1 is provided with two fluid inlets / outlets 3, 4. Two fluid ports 3, 4
Are arranged so as to face one and the same surface of the diaphragm 2. A valve seat 5 is arranged in a portion of the fluid inlet / outlet 3 facing the diaphragm 2, and in a non-pressurized state, the diaphragm 2 is in close contact with the valve seat 5, and the fluid must pass through the diaphragm valve. I can't. The circular diaphragm 2 has a thin-walled deformable portion 6 in the vicinity of the contact portion with the valve seat 5. In this example, the deformable portion 6 is in contact with the inner wall of the housing 1, and this contact portion is also configured to contribute to the prevention of fluid flow under a non-pressurized state. Although this is a preferred aspect of the invention, the diaphragm 2 need not necessarily be configured to contact the inner wall. The outer peripheral portion 7 of the deformable portion 6 is
It communicates with another fluid port 4. The outermost peripheral portion of the diaphragm 2 is fixed to the inner wall of the housing 1 and blocks the flow of fluid.

The other surface of the diaphragm is open to the atmosphere through the opening 8. This is because the deformable portion 6 is easily deformed when the surface of the diaphragm facing the fluid inlet / outlet is pressurized. This is so that it can be transformed. When this one side is not opened under the atmospheric pressure, the deformation of the deformable portion 6 is hindered by the compression resistance of the air existing in the space facing the one side, so that the fluid will not be released unless a considerably large pressure is applied. The diaphragm valve cannot flow.

The diaphragm is preferably, but not limited to, composed of a flexible elastomer for manufacturing and operating performance reasons. In order to allow the fluid to flow even under a slight pressure, the deformable portion 6 is preferably as thin as possible and has a thickness of 1 mm.
The following is preferable. Depending on the flexibility of the elastomer, the thickness of silicon rubber is 0.3 mm
If the pressure is set to about 0.1 atm, the fluid can satisfactorily flow even under a pressure of about 0.1 atm.

When a pressure higher than atmospheric pressure is applied to the fluid inlet / outlet 3 of the diaphragm valve of the present invention, a force for pushing up the diaphragm 2 from the valve seat 5 acts, and this deformable portion 6 of the diaphragm deforms. The diaphragm 2 separates from the valve seat 5, and the deformable housing 1
The part that was in contact with the inner wall of the fluid also separates from the inner wall, and the fluid flows from the fluid inlet / outlet 3 toward the fluid inlet / outlet 4 via the valve seat 5. On the other hand, even when a pressure higher than the atmospheric pressure is applied to the fluid inlet / outlet port 4, a force that pushes up the diaphragm acts, and this deforms the deformable portion of the diaphragm.
The contact portion with the inner wall is separated from the inner wall, and the contact portion with the toilet seat is also separated from the valve seat 5. Therefore, the fluid flowing in from the fluid inlet / outlet 4 flows toward the fluid inlet / outlet 3 via the valve seat 5.
In other words, whichever fluid inlet / outlet is under pressure,
Fluid can flow through the diaphragm valve of the present invention.

On the other hand, no matter which of the fluid inlet / outlet 3 and the fluid inlet / outlet 4 is depressurized, in this case, a force works to attract the diaphragm to the valve seat, so that the fluid flows through the diaphragm valve of the present invention. I can't.

When such a diaphragm valve of the present invention is arranged in a water purifier having a hollow fiber filtration module built therein, it functions as an air vent valve when the internal pressure in the water purifier rises, and at the atmospheric pressure it is external. No air will come in from. On the other hand, if a simple pressurizing means such as a syringe is used, this diaphragm valve can be used as an inlet for injecting the disinfectant solution into the water purifier, but under atmospheric pressure, this valve is used. Dust will not enter the water purifier.

[0017]

Although the diaphragm valve of the present invention has a simple structure, it prevents fluid flow under reduced pressure and atmospheric pressure, while keeping either of the fluid inlets and outlets under slight pressurization. Even if the fluid can flow. In addition, when this diaphragm valve is installed in the water purifier, it plays a role of an air vent in the water purifier that blocks the inflow of air and a role of an inlet for the disinfectant solution that blocks the entry of dust into the water purifier. Can be shared by two valves.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an example of a diaphragm valve of the present invention.

[Explanation of symbols]

 1 Housing 2 Diaphragm 3 Fluid Inlet 4 Fluid Inlet 5 Valve Seat 6 Deformable Part 7 Outer Part 8 Opening

Claims (1)

[Claims] 1. A diaphragm having a thin-walled deformable portion is disposed in close contact with a valve seat of one fluid inlet / outlet in a housing having at least two fluid inlet / outlet ports, and one surface of the diaphragm is exposed to the atmosphere. Open, on the other side,
A diaphragm valve in which the close contact portion with the valve seat communicates with one fluid inlet / outlet through the inner hole of the valve seat, and the outer peripheral portion of the deformable portion communicates with another fluid inlet / outlet.