JP2003194245A - Check valve and coupling system equipped with counterflow preventive function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a check valve and its coupling system embodied in a simple and low-cost structure, assuring easy mounting, and capable of shutting off the powder or fluid at the opening of a pipe and accomplishing momentarily the prevention of the powder or fluid from counterflowing. <P>SOLUTION: The check valve 1 made of elastic material is equipped rigidly with a plug to block the opening and a passage hole 3 for the powder or fluid provided in a film 2 around the plug part and is mounted in such a way as enwrapping at a projection furnished with opening 10 on provided in a female connector 8 to admit passage of the powder or fluid and the opening 10 is blocked. A male connector 12 is inserted into the passage for the powder or fluid in the female connector 8 and the check valve 1 is pushed up by the forefront of the male connector 12, and the opening 10 is opened to allow the powder or fluid to flow with no risk of counterflow. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve and a connection system with a check valve for preventing backflow.

[Prior art]

[0002] Conventionally, a backflow is caused when a fluid such as water or oil and powder such as powdered sugar, a powdery medicine or a toner of a copying machine is transported or discharged during manufacturing or use. To prevent this, various kinds of check valves are used by being incorporated in containers and pipes. In addition to liquid, gas is also included in the fluid here. Is the check valve only required to have a function of preventing backflow, or is it also provided with a function of covering the powder or fluid in the container or pipe so as not to spill? The structure and shape are changed according to the difference in function and various conditions such as the pressure of the powder or fluid in the container or the tube, the particle size of the powder, and the viscosity of the fluid.

For example, in a spray container pre-filled with high-pressure gas, it is necessary to prevent the high-pressure gas in the spray container from flowing back from the filling port, and a check valve for preventing back-flow of high-pressure gas is used. One is a structure having a sphere that is biased by a coil spring.
The check valve mechanism as described above uses a relatively large number of parts to form the check valve, which complicates the assembly process. In particular, when it is used for a container with a small capacity, it is required to miniaturize the parts and to improve the accuracy of the assembly process as well. Therefore, if the check valve structure as described above is used, it can be manufactured at low cost. Things get harder. Furthermore, if a mechanism for canceling the backflow prevention function is provided when it is biased by a coil spring or the like, a large force is required to push the sphere, which makes the backflow prevention release mechanism complicated or difficult to handle. It will not be easy.

On the other hand, a flange type check valve may be inserted and used in the pipe line in order to prevent the back flow of the fluid in the pipe line in response to a small change in stress. Some of the smaller ones have a structure in which a plastic film punched into a disc is enclosed in a cylindrical cavity having an inlet and an outlet on the upper surface and the lower surface, respectively. The backflow prevention mechanism can be relatively easily configured by flattening the upper surface side in the cylindrical cavity and radially forming a plurality of grooves connected to the outflow port on the lower surface side. However, even in this case, steps such as bonding are required to form the cavity, and it takes time to manufacture and the manufacturing cost cannot be sufficiently reduced. Further, in the case of such a mechanism, the function of preventing fluid leakage becomes weak.

[Problems to be Solved by the Invention]

Since the conventional check valve has the structure as described above, it has a function of preventing a backflow and a lid, and further realizes a function of canceling the backflow prevention function in a connecting system including a check valve. In such a case, there are problems that the structure is likely to be complicated and the cost is high because a plurality of members are combined.

The present invention has been made to solve the above-mentioned problems, and by making the check valve a one-piece structure, it can be easily attached and detached and is relatively inexpensive, and powder or fluid It is an object of the present invention to provide a check valve and a connection system having low leakage. Furthermore, it is an object of the present invention to reduce the stress required when releasing the backflow prevention function, and to easily release the backflow prevention function.

[Means and effects for solving the problem]

A check valve according to a first aspect of the present invention is a check valve for preventing backflow of powder or fluid at an opening of a pipe,
A plug portion for fitting into the opening to close the opening,
A film-like elastic body integrally formed with the stopper around the stopper,
Provided integrally with the membrane elastic body, the membrane elastic body is deformed in order to close the opening with the plug even when the pressure applied from the powder or fluid to the plug in the backward direction is almost zero. At the same time, a gripping portion that grips the outer circumference of the pipe so as to cover it is provided, and a passage hole that serves as a passage for powder or fluid passing through the opening is provided in the film-like elastic body. In this case, since the plug portion, the film-like elastic body, and the grip portion are integrally provided in one piece, it is possible to provide an inexpensive check valve that saves extra labor during manufacture or use. Play. In addition, since the check valve can be pressed into the pipe and can be grasped so as to be covered with the grasping portion, it is possible to easily attach and detach the cap so that the cap can be attached to and detached from the bottle mouth.

A check valve according to a second aspect of the present invention is the check valve according to the first aspect of the present invention, wherein the opening has a circular shape and the stopper has a spherical shape in a region in close contact with the opening. It is characterized by. In this case, even when the plug portion is tilted to close the opening, since the area in close contact with the opening is the spherical portion, the portion in contact with the opening is always circular and no gap is generated. This has the effect of preventing the fluid or powder that is the object of backflow prevention from leaking.

A check valve according to a third aspect of the present invention is the check valve according to the first aspect of the present invention, wherein the plug portion has an elastic body in a region in close contact with the opening. In this case, even when the plug part is inclined to close the opening, since the region that is in close contact with the opening is elastic and deforms according to the shape of the opening, no gap is created, thus preventing backflow. There is an effect that it is possible to prevent the fluid or powder that is the target of the leakage.

A check valve according to a fourth aspect of the present invention is the check valve according to the third aspect of the present invention, wherein the plug portion has a foamed portion in a region in close contact with the opening. In this case, the plug portion is easily deformed, and particularly in the case of powder, it is possible to prevent the powder from being compacted in the gap between the opening and the plug portion.

A connection system with a backflow prevention function according to a fifth aspect of the present invention includes a female connector having an opening for allowing a powder or fluid to flow therethrough, and a backflow of the powder or fluid at the opening attached to the female connector. Check valve to prevent,
A connection system comprising a male connector having a tubular portion that is inserted into a female connector and guides powder or fluid flowing through an opening, wherein a check valve fits into the opening and closes the opening. Portion, a film-like elastic body integrally formed with the stopper portion around the stopper portion, and the opening portion at the stopper portion even when the pressure applied from the powder or fluid in the backward direction to the stopper portion is substantially zero. And a mounting portion for deforming the film-like elastic body and fastening it to the female connector in order to close it.The film-forming elastic body has a passage hole which serves as a passage for powder or fluid passing through the opening, and the mounting portion is In a state where the check valve is pushed up by the tip of the tubular portion and the plug portion is opened from the opening, at least one of the check valve and the male connector has a tubular portion for flowing the powder or fluid passing through the passage hole. To form a gap between the check valve and the tip opening of the In which structure is formed.
In this case, the force required to push up the check valve by the tubular portion can be reduced because the stopper is supported by the membrane elastic body, and a gap is created between the tip opening of the tubular portion and the check valve. This has the effect of simplifying the shapes of the connector and the check valve, making it easier to downsize.

A connection system with a backflow prevention function according to a sixth aspect of the present invention is the connection system with a backflow prevention function according to the fifth aspect of the present invention, which includes a holding portion for holding the locking portion so as to wrap around the opening of the female connector. It is a waste. in this case,
Since the check valve can be pressed into the pipe and can be gripped so as to cover the bottle with the grip portion, it is possible to easily attach the cap to the mouth of the bottle.

A connection system with a backflow prevention function according to a seventh invention is the connection system with a backflow prevention function according to the sixth invention, wherein the opening is circular, and the plug portion has a spherical surface in a region in close contact with the opening. It is molded into. In this case, even when the plug part is inclined to close the opening, since the region that is in close contact with the opening is elastic and deforms according to the shape of the opening, no gap is created, thus preventing backflow. There is an effect that it is possible to prevent the fluid or powder that is the target of the leakage.

The connecting system with a backflow preventing function according to an eighth aspect of the present invention is the connecting system with a backflow preventing function according to the sixth aspect of the invention, wherein the plug portion is formed of an elastic body in a region in close contact with the opening. is there. In this case, even when the plug portion is tilted to close the opening of the female connector, since the region that is in close contact with the opening is an elastic body and is deformed according to the shape of the opening, a gap does not occur, Therefore, there is an effect that it is possible to prevent the fluid or powder that is the object of backflow prevention from leaking.

A connecting system with a backflow preventing function according to a ninth invention is the connecting system with a backflow preventing function according to the eighth invention, wherein the plug portion is made of a foam material in a region in close contact with the opening. In this case, the plug portion is easily deformed, and particularly in the case of powder, it is possible to prevent the powder from being compacted in the gap between the opening and the plug portion.

DETAILED DESCRIPTION OF THE INVENTION

A check valve according to an embodiment of the present invention and a connecting system using the check valve with a backflow prevention function will be described below with reference to the drawings. FIG. 1 is a plan view of a check valve according to an embodiment of the present invention. FIG. 2 shows I- of FIG.
It is an I line sectional view. FIG. 3 is a bottom view of the check valve according to the embodiment of the present invention. As shown in FIGS. 1 to 3, the check valve 1 includes a disc-shaped film elastic body 2, a passage hole 3 formed in the film elastic body 2, and a central portion of the back surface of the film elastic body 2. A hemispherical spherical portion 4 formed on the surface, a cross-shaped receiving portion 5 formed at the tip of the spherical portion 4, and a side surface cylindrical shape formed around the membrane elastic body 2 and extending to the back surface side. The portion 6 and the ring-shaped rib 7 formed on the inner peripheral side of the end of the side surface cylindrical portion 6 are provided.

The membrane elastic body 2 is preferably made of an elastomer such as rubber. The membranous elastic body 2 does not necessarily have to be in the shape of a disc, and may have a configuration in which a thin and thin membrane extends radially from the center, and is not limited to the illustrated shape. The thickness of the film-like elastic body 2 is appropriately designed according to the properties of the powder or fluid and the pressure of the powder or fluid to be closed. The passage hole 3 is formed here by making a hole in a part of the film-shaped elastic body 2. The shape and size of the passage hole 3 are also design matters, but if the passage hole 3 is made large, the stress generated when the membrane elastic body 2 is deformed also becomes small.

The spherical portion 4 is preferably formed at the same time as the film elastic body 2, and more preferably formed of the same material as the film elastic body 2. The spherical portion 4 is fitted into an opening of a female connector described later, but it is preferable that the spherical portion 4 has an appropriate elasticity so that the opening can be surely closed when fitted. The spherical portion 4 need only have a spherical shape at least in the vicinity of the portion in contact with the opening, and does not need to have a hemispherical shape as a whole. Since the area of the spherical portion 4 that comes into contact with the opening is spherical, even if the spherical portion 4 is fitted into the opening when the spherical portion 4 is slightly inclined, no gap is formed between the opening and the spherical portion 4. , Powder and fluid are less likely to leak.

At the tip of the spherical portion 4, a receiving portion 5 having a cross shape in a plan view is formed. The length of the two wires forming the cross is formed to be at least longer than the inner diameter of the male connector to be described later, and when the male connector abuts the tip of the spherical portion 4, the male connector is It is supported at the four ends of the book line. Even if the male connector comes into contact with the receiving portion 5, a gap is formed between the male connector and the spherical portion 4, through which powder or fluid can pass.

The side surface cylindrical portion 6 is a disk-shaped film-like elastic body 2.
Of the disk-shaped film-like elastic body 2 and extends toward the back surface side. The side surface cylindrical portion 6 is preferably formed of an elastic body, and more preferably formed of the same material as the film elastic body 2 at the same time as the film elastic body 2. The side surface cylindrical portion 6 preferably has an inner diameter smaller than the outer diameter of the cylindrical convex portion of the female connector described later.
As a result, when the check valve 1 is attached to the female connector, the side surface cylindrical portion 6 comes into close contact with the periphery of the cylindrical convex portion of the female connector, so that the clearance between the cylindrical convex portion and the side surface cylindrical portion 6 is eliminated. It is possible to prevent the powder or fluid from leaking.

A ring-shaped rib 7 is formed at the end of the side surface cylindrical portion 6. The rib 7 is preferably formed of an elastic body, and more preferably formed of the same material as the side surface cylindrical portion 6 and at the same time as the side surface cylindrical portion 6. The ring-shaped rib 7 is fitted into a ring-shaped groove formed in a cylindrical convex portion of a female connector described later. The check valve 1 is locked to the female connector by fitting the rib 7 in the ring-shaped groove.

FIG. 4 is a partially cutaway side view showing the shape of the female connector. The female connector 8 shown in FIG. 4 is formed with a cylindrical convex portion 9. The fracture surface shown in FIG. 4 is a plane that passes through the central axis of the cylindrical convex portion 9 and is parallel to the drawing.
A flow passage is formed in the female connector 8 through the center thereof, and an opening 10 is formed in the upper surface of the female connector 8. The spherical portion 4 of the check valve 1 fits into the opening 10.
When the spherical portion 4 is formed of an elastic body, the spherical portion 4 can be brought into close contact with the opening 10 and leakage of powder or fluid can be prevented. Especially in the case of powder, the spherical portion 4
Are preferably formed of foam. By being formed of a foam, it is possible to prevent the powder from being compacted between the spherical portion 4 and the opening 10. Also,
In the case of foam, the surface of the spherical portion 4 is less likely to be scratched by the powder attached to the opening 10.

FIGS. 5 and 6 are views for explaining the relationship between the check valve and the cylindrical projection 9 of the female connector.
As shown in FIG. 5, the inner diameter of the side surface cylindrical portion 6 is smaller than the outer diameter of the convex portion 9. Further, the difference in height between the location where the spherical portion 4 and the opening 10 are in contact with the upper surface of the groove 11 is the difference between the location where the spherical portion 4 and the opening 10 are in contact with the upper surface of the rib 7. Designed to be larger than the height difference. As shown in FIG. 6, the check valve 1 is covered on the opening 10 and the side surface cylindrical portion 6 is expanded and pushed down until the rib 7 is fitted into the groove 11. As a result, the membrane elastic body 2 is deformed and stretched, and the spherical portion 4 is brought into close contact with the opening 10 so that the side surface cylindrical portion 6 and the membrane elastic body 2 hold the convex portion 9 of the female connector 8. be able to. As shown in FIG. 6, the check valve 1 is attached to the female connector 8 by gripping the side surface cylindrical portion 6 so as to cover the convex portion 9, but the side surface cylindrical portion 6 has a hole. Alternatively, for example, the side surface cylindrical portion 6 may have a nest-like shape.

Next, the operation of the connecting system including the male and female connectors, the female connector, and the check valve will be described with reference to FIGS. 7 and 8. FIG. 7 and FIG. 8 are views showing cross sections at different angles. As shown in FIGS. 7 and 8, the male connector includes a tubular portion 12 and an O-ring 13 for bringing the tubular portion 12 into close contact with the flow path side wall of the female connector.
And is configured. 7 and 8 show a state in which the receiving portion 5 of the check valve 1 is pushed up by the tip of the tubular portion 12 of the male connector. At this time, the film-shaped elastic body 2
And the side surface tubular portion 6 elastically deforms to lift the check valve 1 and a gap is created between the spherical portion 4 and the opening 10. At this time, as shown in FIG. 8, the fluid or powder flowing in from the passage hole 3 flows in from the tip of the tubular portion 12 through the gap between the tubular portion 12 and the check valve 1.

With the above structure, the distance from the passage hole 3 to the tip of the tubular portion 12 can be shortened, the resistance of the fluid or powder from the female connector 8 is reduced, and the fluid or powder flows. It will be easier. In addition, since the length of the tubular portion 12 of the male connector can be shortened, it becomes easier to design the connecting system compactly as compared with the case where the side wall of the tubular portion 12 is provided with a hole.

[Brief description of drawings]

FIG. 1 is a plan view showing the structure of a check valve according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line I-I of FIG.

FIG. 3 is a bottom view of the check valve shown in FIG. 1.

FIG. 4 is a partially cutaway side view showing a configuration of a female connector.

FIG. 5 is a view for explaining how the check valve is attached to the female connector.

FIG. 6 is a view for explaining how the check valve is attached to the female connector.

FIG. 7 is a sectional view for explaining the operation of the connection system.

FIG. 8 is a sectional view for explaining the operation of the coupling system.

[Explanation of symbols]

1 Check Valve, 2 Membrane Elastic Body, 3 Passage Hole, 4 Spherical Part, 5 Receiving Part, 6 Side Cylindrical Part, 7 Rib, 8 Female Connector, 9 Convex Part, 10 Opening, 11 Groove, 12 Tubular Section, 13 O-ring.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yuji Murakami             No. 25, 1-chome Kitanomachi, Yabu City, Osaka Prefecture               Inside Nishiki Castle Co., Ltd. (72) Inventor Yama ▲ Saki ▼ Masayuki             Akira 8-14 Ryuzoji Town, Chuo-ku, Osaka City, Osaka Prefecture             Wa Products Co., Ltd. (72) Inventor Shigeza Iwasaki             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works             Within the corporation (72) Inventor Atsuhiro Saito             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works             Within the corporation F-term (reference) 3H055 AA11 AA22 BA04 BA18 CC02                       CC03 CC04 CC05 CC21 GG08                       GG22 GG27                 3H058 AA13 BB02 BB03 BB22 BB24                       BB33 CA22 CA23 CD26 EE01                       EE19

Claims (9)

[Claims] 1. A check valve for preventing reverse flow of powder or fluid at an opening of a pipe, the plug being fitted into the opening to close the opening, and a periphery of the plug. In the state in which the film-like elastic body integrally formed with the plug part and the film-like elastic body are integrally provided, and the pressure applied from the powder or fluid to the plug part in the reverse flow direction is substantially zero, Also includes a gripping portion that grips so as to cover the outer periphery of the tube while deforming the film-like elastic body to close the opening portion with the plug portion, and a passage for powder or fluid passing through the opening portion. A check valve, wherein the passage hole is formed in the membrane elastic body. 2. The check valve according to claim 1, wherein the opening has a circular shape, and the stopper has a spherical shape in a region in close contact with the opening. 3. The check valve according to claim 2, wherein an area of the plug portion that is in close contact with the opening is made of an elastic body. 4. The plug portion, wherein a region in close contact with the opening is formed of foam.
Check valve described. 5. A female connector having an opening for allowing powder or fluid to flow therethrough, a check valve attached to the female connector for preventing backflow of powder or fluid through the opening, and the female connector. And a male connector having a tubular portion for guiding powder or fluid flowing through the opening, the check valve being fitted into the opening to close the opening. The plug portion, the film-like elastic body formed around the plug portion, and the opening portion at the plug portion even when the pressure applied from the powder or fluid in the backward direction to the plug portion is substantially zero. An attachment portion for deforming the membrane elastic body to hold it in the female connector to close the membrane elastic body, the membrane elastic body having a passage hole serving as a passage for powder or fluid passing through the opening portion; Is in front of the check valve In a state in which the plug portion is pushed up by the tip of the tubular portion of the male connector and the plug portion is opened from the opening portion, at least one of the check valve and the male connector has powder or fluid that has passed through the passage hole. A connection system with a backflow preventing function, characterized in that a structure for forming a gap is formed between the tip opening of the tubular portion and the check valve for flowing the fluid. 6. A membrane elastic body is integrally provided with the plug portion, and the locking portion is integrally provided with the membrane elastic body to grip the female connector so as to cover the periphery of the opening portion. 6. A gripping part for performing the same is included.
Connection system with the described backflow prevention function. 7. The connection system with a backflow prevention function according to claim 6, wherein the opening has a circular shape, and the stopper has a spherical shape in a region in close contact with the opening. . 8. The connection system with a backflow preventing function according to claim 6, wherein the plug portion is formed of an elastic body in the region in close contact with the opening. 9. The connection system with a backflow preventing function according to claim 8, wherein the region of the plug portion that is in close contact with the opening is made of foam.