JPH0531332Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a check valve for allowing gas and/or liquid to flow in one direction and preventing flow from the opposite direction.

[Prior art]

Conventional one-way flutter valves and the like are simply flattened tube-shaped seats, and are insufficiently effective in preventing backflow of gas or liquid. In other words, since the valve is pressed and closed against the flow from the opposite direction, it is relatively easy to produce a backflow prevention effect, but the effect is not necessarily sufficient;
When suction is applied from the air supply side, when the suction pressure is strong, the valve is forced into close contact with the suction force, so there is less inflow from the opposite direction and the backflow prevention effect can be achieved.
When the negative pressure is low and the suction force is relatively weak, the tightness of the valve is unstable to begin with, and because the valve is not able to operate, the minute gaps in the tight contact are often not closed and backflow occurs.

In order to solve this problem, the inventor of the present invention previously devised a non-return valve in which both ends of the tip of a flat tube were sealed, and disclosed this in Japanese Utility Model Application Publication No. 67477/1983. This check valve has already been put into practical use and is showing its effectiveness, but depending on the application, a large opening is required, and in that case, the size of the outlet side must also be large. , it becomes difficult to maintain the tightness of the valve, resulting in a problem that the backflow prevention effect is impaired.

[Purpose of invention]

The present invention is a check valve that prevents the flow of gas or fluid from the opposite direction across the valve.
The purpose of this invention is to provide a check valve that is particularly suitable for applications where the flow rate is large and the opening size must be large, and that exhibits superior backflow prevention effects without unnecessarily increasing flow resistance. be.

[Structure of the idea]

That is, the present invention consists of a soft, flat bag-like material, the inner surface of the bag-like material is in close contact with each other, and the opening that serves as the fluid inlet has a circular or slit-like cross-sectional shape, and the fluid The other end, which serves as an outlet, is an anti-reflux valve characterized by having a plurality of discharge ports provided at the bottom of the bag.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A check valve according to an embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic diagram of a check valve according to an embodiment of the present invention. The non-return valve consists of a soft, flat, bag-like material 1 whose inner surface is in close contact with each other, one end of which is an opening 2 that serves as an inlet for fluid, and the bottom 3 of the other end is provided with an outlet for fluid. A plurality of discharge ports 4 are provided to constitute a valve section.

FIG. 2 is a schematic diagram of a check valve according to another embodiment of the present invention. In the example shown in Fig. 1, the opening 2 is flat and closely attached, and its cross-sectional shape is slit-like, whereas in the example shown in Fig. 2, the opening 5 is closed for convenience of use. Although it is formed in a circular or elliptical shape, the bottom portion 3 at the other end is a valve portion having the same structure as the example shown in FIG.

The flat bag-like object 1 is made by sealing one end of a tubular film formed by extrusion molding or other method to form a bag with a bottom, or by overlapping two flat sheets and pasting the lower sides on both sides. There is no problem even if it is made into a bag. The thinner the sheet, the more effective it is, but it is particularly preferable that the thickness of the bottom portion 3, which serves as the valve portion, be approximately 0.1 to 0.6 mm.

Further, as the material, latex rubber, silicone rubber, thermoplastic elastomer, soft thermoplastic resin, etc. can be used.

The non-return valve of the present invention is normally installed and built into containers such as medical drainage bags, bottles, pipe-shaped containers, etc., but it can also be installed at the end of a pipe or tube. There is no problem even if there is. FIG. 3 is a diagram showing an example in which a bag-like object 12 serving as a backflow prevention valve is attached and built into the inside of the bag 11, and the opening 13 is formed by overlapping the bag 11 and the bag-like object 12 and gluing or heat-sealing them. If necessary, plastic plates or the like may be inserted for reinforcement during bonding. Also,
The bag 11 may be discarded with the liquid stored therein, but if the liquid is to be discharged, the protrusion 14 at the bottom may be cut off, or a mechanism for discharging the contents may be installed in advance.

FIG. 4 is a diagram showing a state in which liquid is stored in the bag 11 equipped with the check valve 12 according to the present invention. Even if the liquid enters the check valve 12 from the opening 13, it will be easily discharged to the bag 11 side through the outlet 15 due to its own weight until it reaches the same level as the liquid level in the bag 11. be done. On the other hand, if a force is applied from the outside of the bag 11 and the liquid level on the bag 11 side becomes higher, or if the inside of the check valve 12 becomes depressurized, the bottom 3 of the check valve 12 The adhesion becomes stronger, and liquid will not flow back toward the inside of the check valve 12.

The longer the length h of the bag-like object 12 serving as a check valve, the better the effect of preventing back flow, but when used as shown in FIG. 4, the flow resistance to passage of fluid increases. The length h of the bag-shaped article 12 can be used in a range of about 1/4 to 3/4 of the length H of the bag 11, but from a practical standpoint, it is preferably about 2/4 to 3/4.
Further, the shapes of the discharge ports 4 and 15 are not particularly limited, but their sizes may be determined by considering the balance between backflow prevention effect and flow resistance. The total width w of the plurality of discharge ports 4 is the width W of the entire bag-like object 1.
It is preferable to set it in the range of about 1/4 to 2/3 of , and it may be set in relation to the purpose and the length h of the bag-like article.

[Effect of idea]

The check valve according to the present invention is based on the conventional one-way flutter valve, but has a larger opening and can increase the flow rate without unnecessarily increasing fluid flow resistance. The present invention provides a simple and novel check valve that can exhibit a sufficient back flow prevention effect while ensuring smooth flow.

[Brief explanation of the drawing]

Figures 1 and 2 are schematic diagrams of a check valve that is an embodiment of the present invention. Figure 1 shows a valve with a slit-shaped opening, and Figure 2 shows a valve with a circular opening. In the figure, a is a front view, b is a sectional view of the bottom of the check valve, and c is a side view.
Furthermore, Figures 3 and 4 are diagrams showing an example in which the non-return valve of the present invention is installed and incorporated inside a medical drainage bag, and Figure 4 particularly shows the state in which liquid is stored. .

Claims (1)

[Scope of utility model registration request] It consists of a soft flat bag-like material, the inner surface of the bag-like material is in close contact with each other, and the opening that serves as the fluid inlet has a circular or slit-like cross-sectional shape,
A backflow prevention valve characterized in that the other end, which serves as a fluid outlet, has a bag-shaped bottom with a plurality of discharge ports.