JP4110315B2 - Connection system with check valve and backflow prevention function - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a check valve and a connection system having a check flow prevention function including the check valve.
[Prior art]
[0002]
Conventionally, to prevent backflow when transporting and discharging fluids such as water and oil and powders such as powdered sugar, powdered medicines and copier toners during manufacture and use Various types of check valves are used in containers and pipes. In addition, the fluid here includes gas in addition to liquid. Whether the check valve only requires a function to prevent backflow, or has a function to cover the powder or fluid in the container or tube so that it does not fall out, etc. The structure and shape are changed according to the difference in function and according to various conditions such as the pressure of the powder or fluid in the container and the tube, the particle diameter of the powder, and the viscosity of the fluid.
[0003]
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 this is one of the check valve configurations for preventing the back-flow of high-pressure gas. Some have a structure using a sphere biased by a coil spring.
The check valve mechanism as described above uses a relatively large number of parts to constitute the check valve, and thus the assembly process is complicated. In particular, when used in a small-capacity container, it is required to make parts finer and improve the accuracy of the assembly process. Therefore, when the check valve structure as described above is used, it is manufactured at a low cost. Things get harder.
Further, when a mechanism for releasing the backflow prevention function is provided when biased by a coil spring or the like, a large force is required to push the sphere, so that the backflow prevention release mechanism is complicated or handled. It will not be easy.
[0004]
On the other hand, a flange-type check valve may be inserted into the pipe line and used for the purpose of preventing the back flow of the fluid in the pipe line in response to a small change in stress. A small one has a structure in which a plastic film punched out in a disk shape is enclosed in a cylindrical cavity having an inlet and an outlet on the upper and lower surfaces, respectively. By making the upper surface side in the cylindrical cavity flat and forming a plurality of grooves connected to the outflow port on the lower surface side, a backflow prevention mechanism can be configured relatively easily. However, even in this case, a process such as bonding is required to form the cavity, and it takes time to manufacture and the manufacturing cost cannot be reduced sufficiently. In addition, in the case of such a mechanism, the function of preventing fluid leakage is weakened.
[Problems to be solved by the invention]
[0005]
Since the conventional check valve has the structure as described above, it has a function to prevent backflow and cover, and further to realize a function to cancel the backflow prevention function in a connection system including the check valve. Since a plurality of members are combined, there is a problem that the structure is likely to be complicated and the price is increased.
[0006]
The present invention has been made to solve the above-described problems, and by making the check valve a one-piece configuration, it can be easily attached and detached and can be made relatively inexpensive, and there is little leakage of powder or fluid. An object is to provide a check valve and a coupling system.
It is another object of the present invention to reduce the stress required to cancel the backflow prevention function and to easily release the backflow prevention function.
[Means for solving the problems and effects]
[0007]
A check valve according to the first invention is a check valve for preventing a backflow of powder or fluid in an opening of a pipe, and a stopper for fitting into the opening and closing the opening; A membrane-like elastic body molded integrally with the stopper portion around the stopper portion, and provided integrally with the membrane-like elastic body, the pressure applied in the reverse flow direction from the powder or fluid to the stopper portion is almost zero. Even in a state, a gripping part for gripping the outer periphery of the tube while covering the outer periphery of the tube while deforming the membrane elastic body so as to close the opening with the plug part, and passing as a powder or fluid passage through the opening The hole is provided in the film-like elastic body.
In this case, since the plug portion, the membrane-like elastic body, and the grip portion are integrally provided and are in one piece, there is an effect that it is possible to provide an inexpensive check valve that saves extra labor when manufactured or used. Play.
In addition, since the check valve can be pressed and fitted to the tube so as to be covered and covered by the holding portion, as in the case of attaching and detaching the cap to the mouth of the bottle, there is an effect that the attachment and detachment can be easily performed.
[0008]
The check valve according to a second aspect of the invention is the check valve according to the first aspect of the invention, wherein the opening is circular, and the plug portion is formed in a spherical shape in a region close to the opening. To do.
In this case, even when the plug portion is inclined to close the opening portion, the region in close contact with the opening portion is a spherical portion, so that the portion in contact with the opening portion is always circular and no gap is formed. There is an effect that it is possible to prevent leakage of fluid or powder which is a target of backflow prevention.
[0009]
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 is an elastic body in a region in close contact with the opening.
In this case, even when the plug portion is inclined and the opening portion is closed, since the region in close contact with the opening portion is an elastic body, no deformation occurs according to the shape of the opening portion, thus preventing backflow. There is an effect that it is possible to prevent the fluid or powder that is the target of the leakage.
[0010]
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 is a foam in a region in close contact with the opening.
In this case, the plug portion is easily deformed, and in the case of powder, it is possible to prevent the powder from being pressed and hardened in the gap between the opening and the plug portion.
[0011]
A connection system with a backflow prevention function according to a fifth aspect of the present invention is a female connector having an opening for circulating powder or fluid, and a reverse attached to the female connector to prevent backflow of powder or fluid in the opening. A connection system comprising a stop valve and a male connector having a tubular portion that is inserted into a female connector and guides powder or fluid flowing through the opening, and the check valve is fitted into the opening to close the opening Plug, a membrane-like elastic body formed integrally with the plug around the plug, and the plug even when the pressure applied to the plug from the powder or fluid in the reverse flow direction is almost zero And an attachment part for deforming the membranous elastic body and fastening it to the female connector in order to close the opening at the section, and the membranous elastic body has a passage hole serving as a passage for powder or fluid passing through the opening. The mounting part has a check valve at the tip of the tubular part. In a state where the plug portion is opened from the opening portion, at least one of the check valve and the male connector is used to flow the powder or fluid that has passed through the passage hole and the check opening valve of the tubular portion. A structure for forming a gap between them is formed.
In this case, since the plug portion is supported by the membranous elastic body, the force required to push up the check valve in the tubular portion can be reduced, and a gap is formed between the distal end opening of the tubular portion and the check valve. The connector and the check valve are simplified in shape to facilitate downsizing.
[0012]
A connection system with a backflow prevention function according to a sixth aspect of the invention is the connection system with a backflow prevention function according to the fifth aspect of the invention, and includes a gripping part for gripping the locking part so as to cover the periphery of the opening of the female connector.
In this case, the check valve can be pushed and fitted to the tube so that the cap is fitted into the mouth of the bottle and can be gripped so as to be covered with the gripping portion, so that there is an effect that the mounting can be performed easily.
[0013]
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 is formed in a spherical shape in a region close to the opening. It is what.
In this case, even when the plug portion is inclined and the opening portion is closed, since the region in close contact with the opening portion is an elastic body, no deformation occurs according to the shape of the opening portion, thus preventing backflow. There is an effect that it is possible to prevent the fluid or powder that is the target of the leakage.
[0014]
The connection system with a backflow prevention function according to an eighth aspect of the present invention is the connection system with a backflow prevention function according to the sixth aspect of the present invention, wherein the plug portion is formed of an elastic body in a region close to the opening.
In this case, even when the plug portion is inclined to close the opening portion of the female connector, the region in close contact with the opening portion is an elastic body, so the gap does not occur because it deforms according to the shape of the opening portion, Therefore, there is an effect that it is possible to prevent leakage of the fluid or powder that is the object of backflow prevention.
[0015]
A connection system with a backflow prevention function according to a ninth invention is the connection system with a backflow prevention function according to the eighth invention, wherein the plug portion is a foam in a region close to the opening.
In this case, the plug portion is easily deformed, and in the case of powder, it is possible to prevent the powder from being pressed and hardened in the gap between the opening and the plug portion.
DETAILED DESCRIPTION OF THE INVENTION
[0016]
Hereinafter, a check valve according to an embodiment of the present invention and a connection system with a check flow prevention function using the check valve will be described with reference to the drawings.
FIG. 1 is a plan view of a check valve according to an embodiment of the present invention. 2 is a cross-sectional view taken along the line II of FIG. 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 disk-shaped film-like elastic body 2, a passage hole 3 formed in the film-like elastic body 2, and the center of the back surface of the film-like elastic body 2. A hemispherical spherical surface portion 4 formed on the spherical surface portion 4, a planar cross-shaped receiving portion 5 formed at the tip of the spherical surface portion 4, and a side surface cylindrical shape formed around the film-like elastic body 2 and extending to the back surface side. And a ring-shaped rib 7 formed on the inner peripheral side of the end of the side cylindrical portion 6.
[0017]
The film-like elastic body 2 is preferably made of an elastomer such as rubber. The film-like elastic body 2 is not necessarily disc-shaped, and for example, a thin and thin film may extend 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 and fluid, the pressure of the powder and fluid to be closed, and the like.
Here, the passage hole 3 is formed by making a hole in a part of the membranous elastic body 2. Although the shape and size of the passage hole 3 are also design matters, when the passage hole 3 is enlarged, the stress generated when the film-like elastic body 2 is deformed is also reduced.
[0018]
The spherical portion 4 is preferably formed at the same time as the film elastic body 2, and is preferably formed of the same material as the film elastic body 2. The spherical surface portion 4 is fitted into an opening portion of a female connector, which will be described later, but preferably has an appropriate elasticity so that the opening portion can be reliably closed when fitted. The spherical portion 4 only needs to have a spherical shape at least in the vicinity of the portion in contact with the opening, and does not necessarily have a hemispherical shape as a whole.
Since the region in contact with the opening of the spherical portion 4 is spherical, there is no gap between the opening and the spherical portion 4 even if the spherical portion 4 is fitted to the opening in a slightly inclined state. , Powder and fluid are difficult to leak.
[0019]
A receiving portion 5 having a cross-shaped planar shape is formed at the tip of the spherical portion 4. The length of the two lines constituting the cross is at least longer than the inner diameter of the male connector, which will be described later, and when the male connector comes into contact with the tip of the spherical surface portion 4, the male connector Supported by four ends of the book wire.
Even when the male connector abuts on the receiving portion 5, a gap through which powder or fluid can pass is formed between the male connector and the spherical portion 4.
[0020]
The side cylindrical portion 6 communicates with the outer diameter of the disk-like film-like elastic body 2 and extends from the end of the disk-like film-like elastic body 2 toward the back side. The side cylindrical portion 6 is preferably formed of an elastic body, and more preferably formed of the same material as the film-shaped elastic body 2 and simultaneously with the film-shaped elastic body 2.
The side cylindrical portion 6 preferably has an inner diameter that is narrower than the outer diameter of the cylindrical convex portion of the female connector described later. Thereby, when the check valve 1 is attached to the female connector, the side cylindrical portion 6 is in close contact with the periphery of the cylindrical convex portion of the female connector, so that the gap between the cylindrical convex portion and the side cylindrical portion 6 is reduced. It is possible to prevent the powder or fluid from leaking.
[0021]
A ring-shaped rib 7 is formed at the end of the side cylindrical portion 6. The rib 7 is preferably formed of an elastic body, and more preferably formed of the same material as that of the side cylindrical portion 6 at the same time as the side 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. When the rib 7 is fitted into the ring-shaped groove, the check valve 1 is locked to the female connector.
[0022]
FIG. 4 is a partially broken side view showing the shape of the female connector.
A cylindrical convex portion 9 is formed on the female connector 8 shown in FIG. The fracture surface shown in FIG. 4 is a plane that passes through the central axis of the cylindrical projection 9 and is parallel to the drawing.
The female connector 8 is formed with a flow passage passing through the center, and an opening 10 is formed on the upper surface of the female connector 8.
The spherical portion 4 of the check valve 1 is fitted into the opening 10. If the spherical surface portion 4 is formed of an elastic body, the spherical surface portion 4 can be brought into close contact with the opening portion 10, and leakage of powder or fluid can be prevented.
In particular, in the case of powder, the spherical portion 4 is preferably formed of a foam. By being formed of a foam, it is possible to prevent the powder from being pressed between the spherical portion 4 and the opening 10. In the case of a foam, the surface of the spherical portion 4 is hardly damaged by the powder adhering to the opening 10.
[0023]
5 and 6 are views for explaining the relationship between the check valve and the cylindrical convex portion 9 of the female connector. As shown in FIG. 5, the inner diameter of the side cylindrical portion 6 is smaller than the outer diameter of the convex portion 9. Furthermore, 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 larger than the height difference.
As shown in FIG. 6, the check valve 1 is put on the opening 10 and pushed down until the rib 7 fits into the groove 11 while expanding the side cylindrical portion 6. As a result, the membranous elastic body 2 is deformed and stretched, and the spherical surface portion 4 is brought into close contact with the opening 10 so that the side cylindrical portion 6 and the membranous 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 cylindrical portion 6 so as to cover the convex portion 9, but the side cylindrical portion 6 has a hole. For example, the side cylindrical portion 6 may have a nest shape.
[0024]
Next, using FIG. 7 and FIG. 8, the operation of the connection system comprising male and female connectors, female connectors and check valves will be described. FIGS. 7 and 8 are cross-sectional views showing 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 channel side wall of the female connector.
7 and 8 show a state where 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 elastic membrane 2 and the side cylindrical portion 6 are elastically deformed to lift the check valve 1, and a gap is formed 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 from the tip of the tubular portion 12 through the gap between the tubular portion 12 and the check valve 1.
[0025]
With the above-described configuration, the distance from the passage hole 3 to the tip of the tubular portion 12 can be shortened, the resistance that the fluid or powder receives from the female connector 8 is reduced, and the fluid or powder can easily flow.
Moreover, since the length of the tubular portion 12 of the male connector can be shortened, it is easy to design the connection system in a compact manner as compared with the case where a hole is provided in the side wall of the tubular portion 12 or the like.
[Brief description of the drawings]
FIG. 1 is a plan view showing a configuration of a check valve according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line II of FIG.
FIG. 3 is a bottom view of the check valve shown in FIG.
FIG. 4 is a partially cutaway side view showing the configuration of the female connector.
FIG. 5 is a view for explaining the mounting of a check valve to the female connector.
FIG. 6 is a view for explaining the mounting of the check valve to the female connector.
FIG. 7 is a cross-sectional view for explaining the operation of the connection system.
FIG. 8 is a cross-sectional view for explaining the operation of the connection system.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Check valve, 2 Membrane-like 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 part, 11 Groove, 12 Tubular Part, 13 O-ring.

Claims (9)

A connection comprising a female connector having an opening for circulating powder or fluid, and a male connector having a tubular portion that is inserted into the opening of the female connector and guides the powder or fluid flowing through the opening. In the system, a check valve attached to the female connector to prevent backflow of powder or fluid in the opening,
A stopper for fitting into the opening and closing the opening;
A film-like elastic body provided integrally with the plug portion around the plug portion, and having a passage hole serving as a passage of powder or fluid passing through the opening ;
The film-like elastic body, the female connector while deformation is so capable of closing the opening in the stopper portion even in a state of substantially zero pressure on the backflow direction with respect to the plug portion from the powder or fluid In the thing with the attaching part to fasten ,
A receiving portion that can form a gap through which powder or fluid flows between the plug portion and the distal end opening of the tubular portion in a state where the opening is opened by being pushed up at the distal end of the tubular portion. A check valve characterized by comprising: The receiving portion is a convex shape having a cross shape when viewed from the plane, and the length of two lines constituting the cross is at least longer than the inner diameter of the tubular portion. The check valve according to claim 1. The check valve according to claim 1 or 2 , wherein the opening is circular, and the plug portion is formed in a spherical shape in a region close to the opening. The plug unit is characterized by areas closely to the opening is an elastic body, the check valve according to any one of claims 1 to 3. The check valve according to claim 4 , wherein the plug portion is formed of a foam in a region in close contact with the opening. The check valve according to any one of claims 1 to 5, wherein the film-like elastic body is formed at the same time as the stopper portion with the same material as the stopper portion. The said attaching part is provided integrally with the said film-like elastic body, The holding part which hold | grips so that the surroundings of the said opening part of the said female connector may be covered is characterized by the above-mentioned. Check valve described in one. 8. The check valve according to claim 7, wherein the grip portion is formed simultaneously with the film-like elastic body by the same material as the film-like elastic body. A female connector having an opening for the passage of powder or fluid, a check valve to prevent backflow of the powder or fluid in the opening is attached to the female connector, the opening of the female connector is inserted Ri Do and a male connector having a tubular portion for guiding the powder or fluid flowing through the opening, the check valve is constituted by a check valve according to any one of claims 1 to 8 characterized in that there, the coupling system.

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