JP2022101715A - cap - Google Patents

Abstract

To provide a cap that is attached to a mouth of a container and has a check valve therein and is capable of reliably shutting off air.SOLUTION: A check valve 20 includes: an inner plug 21 which is arranged in a location to block a mouth of a container 12 and has an opening 25 through which a content liquid in the container 12 flows out; and a valve body 23 which is arranged to cover the opening 25 of the inner plug 21 and a top surface 51 of the inner plug around the opening and is displaced between a valve opening position and a valve closing position in an axial direction of the opening 25 of the inner plug 21. The valve body 23 includes: an annular sealing part 27 which closely contacts the top surface 51 of the inner plug on the periphery of the opening 25 when it is in the valve closing position; and a liquid-sealing part 50 which is raised from a lower surface 49 of the valve body toward the top surface 51 of the inner plug and is formed in an annular shape along the periphery of the opening 25 of the inner plug 21 on an inner peripheral side than the sealing part 27. There is a liquid-sealing void 54 between the liquid-sealing part 50 and the top surface 51 of the inner plug.SELECTED DRAWING: Figure 1

Description

The present invention relates to a cap to be attached to a container, and more particularly to a cap having a built-in check valve.

A technique for suppressing oxidation of contents in a container filled with contents such as soy sauce is known. This is to put the contents such as soy sauce in the inner container of the double container, attach the cap to the mouth of the inner container, and seal the opening of the inner plug in the check valve placed inside the cap with the valve body. It is a thing.

Prior art relating to the structure of such a container and a cap is described in, for example, Patent Document 1. In this method, an inner plug is attached to the mouth of the inner container of the double container, and the valve body is arranged in the communication cylinder provided in the inner plug. The valve body can slide along the direction of the container axis in the communication cylinder. The valve body is formed in a bottomed tubular shape arranged coaxially with the container axis, and has an annular flange extending radially outward at the upper end portion in the container axis direction. The annular upper end surface of the communication cylinder constitutes a valve seat, and this valve seat abuts on the flange of the valve body to seal the valve. Then, the valve body slides in the communication cylinder along the direction of the container axis to open and close between the flange and the valve seat of the communication cylinder.

Further, those described in Patent Document 2 are known. This is the liquid or content of the contents such as soy sauce between the inner peripheral surface of the seal portion of the valve body and the valve seat of the inner plug, and between the outer peripheral surface of the seal portion of the valve body and the valve seat of the inner plug. By holding the liquid in layers and sealing it, air is blocked from entering the inner container. The contents flow out of the container by manually applying a pressing force to the container.

Japanese Patent No. 6450243 Japanese Unexamined Patent Publication No. 2019-43644

In the configuration described in Patent Document 2, the certainty of the liquid seal that blocks air from entering the inner container is the liquid held between the inner peripheral surface and the outer peripheral surface of the seal portion and the valve seat of the inner plug. It depends on the quantity. Factors that affect the amount of liquid are, for example, the posture of the inner container when the squeezing force is released, the vibration applied to the container, the remaining amount of the contents of the inner container, and the like.
The present invention solves the above-mentioned problems, and an object of the present invention is to provide a cap capable of reliably blocking air.

In order to solve the above-mentioned problems, the cap of the present invention is used.
A cap that is attached to the mouth of the container and has a check valve inside.
The check valve is placed at a position that closes the mouth of the container, and is placed so as to cover the inner plug having an opening through which the content liquid in the container flows out, the opening of the inner plug, and the upper surface of the inner plug around the opening. It has a valve body that is displaced over the valve opening position and the valve closing position in the axial direction of the opening of the plug.
The valve body has an annular seal portion that is in close contact with the upper surface of the inner plug around the opening when the valve body is in the closed position, and the inner peripheral side of the seal portion, from the lower surface of the valve body to the upper surface of the inner plug. It has a liquid sealing portion formed in an annular shape along the opening of the inner plug as well as being raised.
It is characterized by having a liquid sealing gap between the liquid sealing portion and the upper surface of the inner plug.

According to the cap of the present invention, there is a recess formed in a certain range in the circumferential direction on the upper surface around the opening of the inner plug, which is recessed more than the other ranges, and a liquid sealing gap is formed by this recess. Is preferable.

Further, according to the cap of the present invention, the liquid-sealed portion of the valve body formed in an annular shape has a low ridge portion formed in a certain range in the circumferential direction and the ridge height is lower than the other ranges. It is preferable that a liquid sealing gap is formed between the low ridge portion and the upper surface of the inner plug.

Further, according to the cap of the present invention,
A protrusion protruding toward the upper surface of the inner plug is formed in the annular seal portion, and the seal portion has a portion having no protrusion in a certain range along the circumferential direction or a protrusion amount larger than that in other ranges. Has a small part,
Instead of between the liquid seal part of the valve body and the upper surface of the inner plug, or between the liquid seal part of the valve body and the upper surface of the inner plug,
It is preferable to have a liquid sealing gap between the portion having no annular protrusion or the portion having a protrusion amount smaller than that of other ranges and the upper surface of the inner plug.

Further, according to the cap of the present invention, the inner plug rises from the upper surface of the inner plug toward the valve body around the opening on the inner peripheral side of the liquid sealing portion of the valve body, and along the edge of the opening of the inner plug. It is preferable to have a liquid sealing portion of an inner plug formed in an annular shape.

Further, according to the cap of the present invention, it is preferable to have a liquid sealing gap between the annular sealing portion and the upper surface of the inner plug.

Further, according to the cap of the present invention, it is preferable that the valve body has a thin portion for improving the displacement of the valve body over the valve opening position and the valve closing position.

In the above configuration, when the valve body is in the valve open position, the upper surface of the inner plug and the lower surface of the valve body are separated from each other and the flow path between the two becomes wider, and the content liquid flowing out from the opening of the inner plug is separated from the upper surface of the inner plug and the valve. It quickly flows out through the flow path between the lower surface of the body and the lower surface of the body.

In the process of returning the valve body from the valve open position to the valve closed position, the upper surface of the inner plug and the lower surface of the valve body approach each other, the flow path between the two becomes narrower, and the valve body fluid sealing portion resists the flow of the content liquid. The content liquid remaining between the upper surface of the inner plug and the lower surface of the valve body remains in the liquid sealing gap between the liquid sealing portion of the valve body and the upper surface of the inner plug to form a liquid seal. That is, it blocks the liquid sealing gap from communicating with the outside of the container.

Therefore, the liquid sealing can reliably block the invasion of external air into the container, and the contact between the liquid content of the container and the external air can be reliably prevented.

In addition, by forming a bottleneck between the liquid sealing part of the valve body and the upper surface of the inner plug, the action of holding the content liquid due to the surface tension of the content liquid is enhanced, and the content liquid is reliably held by the liquid sealing gap. Can be done.

It is sectional drawing of the cap of the embodiment of this invention in the state attached to the container. It is a top view of the inner plug in FIG. It is sectional drawing of the inner plug of FIG. It is sectional drawing of the valve member constituting the valve body in FIG. It is a bottom view of the valve member of FIG. It is a three-dimensional view of the inner plug in FIG. It is a three-dimensional view of the valve member in FIG. It is a figure which shows the operation state of a valve body. It is a figure which shows the next operation state of FIG. It is a figure which shows the next operation state of FIG. It is a figure which shows the main part in FIG. 1 in an enlarged manner. It is a figure which shows the part shown in FIG. 1 with a wider range. It is a top view of the inner plug in the cap of another embodiment of this invention. It is sectional drawing of the inner plug of FIG. It is a figure which shows the positional relationship between the inner plug of FIG. 13 and FIG. 14 and a valve body. It is a bottom view of the valve member constituting the valve body shown in FIG. It is sectional drawing of the valve body in the cap of still another embodiment of this invention. It is a bottom view of the valve member constituting the valve body shown in FIG. It is sectional drawing of the main part in the cap of still another embodiment of this invention. It is sectional drawing of the main part in the cap of still another embodiment of this invention. It is sectional drawing of the main part in the cap of still another embodiment of this invention. It is sectional drawing of the main part in the cap of still another embodiment of this invention.

FIG. 12 shows a state in which the cap 11 according to the embodiment of the present invention is attached to the container 12. Here, the container 12 has a double structure including an outer container 13 and an inner container 14, and a cap 11 is attached to the mouth portion 10 of the outer container 13. The cap 11 integrally includes a main body 15 that fits into the mouth portion 10 of the outer container 13 and a lid 16 for opening and closing the main body 15. The main body 15 has a discharge port 17, and the lid 16 has a closing portion 18 that closes the discharge port 17.

A check valve 20 is arranged inside the cap 11. The check valve 20 includes an inner plug 21 attached to the mouth portion 19 of the inner container 14, and a valve member 22 arranged so as to cover the inner plug 21. The valve member 22 is integrated with the valve body 23 as a liquid valve arranged so as to face the inner plug 21 in the axial direction of the inner container 14, and supports the outer peripheral edge of the valve body 23. It has a support portion 24 that is externally fitted and mounted on the stopper 21.

The inner plug 21 has an opening 25 through which the liquid of the contents such as soy sauce in the container 12, that is, the contents liquid passes, and the periphery of the opening 25 constitutes the valve seat 26. The valve body 23 is arranged to face the valve seat 26 so as to cover the opening 25 of the inner plug 21, and has a seal portion 27 formed along the peripheral edge portion of the valve body 23 surrounding the opening 25. The seal portion 27 forms a part of the valve body 23, protrudes in a curved shape toward the valve seat 26 on the inner surface side of the valve body 23, and has a groove-like recessed shape on the outer surface side of the valve body 23. .. In the seal portion 27, the seal surface 28 is in contact with and separated from the valve seat 26 around the opening 25 of the inner plug 21. A plurality of liquid holes 29 are opened in the valve body 23 at a position outside the seal portion 27. The liquid holes 29 are opened over the valve body 23 and the shoulder portion of the support portion 24 at a plurality of locations along the circumferential direction of the seal portion 27.

The cap 11 has an intake port 31, and the intake port 31 communicates between the inner container 14 and the outer container 13. The valve member 22 has an air valve body 32 that opens and closes the intake port 31, and the air valve body 32 has a square shape or a fan shape extending outward in the radial direction of the cap 11 from the outer peripheral edge of the support portion 24.

When the contents of the inner container 14 are discharged by the cap 11, a pressing force is applied to the outer container 13 and this pressing force is applied to the inner container 14 through the air layer between the outer container 13 and the inner container 14. And squeeze the inner container 14.

At this time, due to the increase in the internal pressure of the inner container 14, the valve body 23 transitions from the valve closed state shown in FIG. 12 to the initial motion state shown in FIG. 8, and starts to move in a direction away from the opening 25 of the inner plug 21. .. Further, the valve body 23 transitions from the intermediate state shown in FIG. 9 to the valve open state shown in FIG. That is, as the valve body 23 moves, the seal portion 27 moves away from the valve seat 26 to the valve opening position, and as shown in FIG. 10, the content liquid 57 of the inner container 14 moves to the seal portion 27 and the valve seat. It passes between 26 and is pushed out from the discharge port 17 of the cap 11 shown in FIG.

On the other hand, when the squeezing force applied to the outer container 13 is released, the elastically deformed outer container 13 returns to its original shape due to the restoring force, so that the internal space of the outer container 13 expands and the pressure is reduced. Therefore, as shown by a virtual line in FIG. 1, the air valve body 32 opens, and air flows in between the outer container 13 and the inner container 14 through the intake port 31.

At the same time, the pressure inside the inner container 14 from which the pressing force is released becomes decompressed, so that the valve body 23 approaches the opening 25 of the inner plug 21 as shown in FIG. 12, using the pressure difference between the inside and outside of the container as the driving pressure. Pressed in the direction. Then, as the valve body 23 moves, the seal portion 27 moves to a valve closing position in contact with the valve seat 26, and seals between the seal surface 28 and the valve seat 26.

Further, by holding the content liquid such as soy sauce in a layer between the valve body 23 and the inner plug 21 and sealing the liquid, the invasion of air into the inner container 102 is blocked. Hereinafter, this point will be described in detail.

As shown in FIGS. 1 and 6, the inner plug 21 has an annular groove 35 on the outer periphery of the valve seat 26, and as shown in FIGS. 2, 3 and 6, the inner plug 21 has an outer edge 36 extending to the outer peripheral side of the annular groove 35. Notches 37 are provided at a plurality of positions along the circumferential direction. The notch 37 fits into a protrusion (not shown) formed inside the main body 15 of the cap 11 shown in FIG. 1 to position the inner plug 21 around the axis of the opening 25.

On the other hand, as shown in FIGS. 2 and 3, a protrusion 38 for positioning the valve member 22 in the circumferential direction is formed on the inner peripheral surface of the annular groove 35 of the inner plug 21.

As described above, the valve body 23 of the valve member 22 shown in FIG. 1 is elastically displaced between the valve opening position and the valve closing position in the axial direction of the opening 25 of the inner plug 21. The support portion 24 of the valve member 22 is integrated with the valve body 23 to support the outer peripheral edge of the valve body 23, and is fitted and mounted in the annular groove 35 of the inner plug 21. The support portion 24 has a recess 39 on its inner peripheral surface that fits into the protrusion 38 of the inner plug 21.

As shown in detail in FIGS. 4 and 8 to 11, the curved shape of the seal portion 27 of the valve body 23 described above is the outer curved portion 41 on the side facing the liquid hole 29 and the side facing the opening 25 of the inner plug 21. The shape of the inner curved portion 42 is different from that of the inner curved portion 42. That is, the seal portion 27 has an outer curved portion 41 on the side of the liquid hole 29 with the apex of the curved shape as a boundary and an opening 25 of the inner plug 21 in a natural no-load state in which a forced force does not act on the valve body 23. The inner curved portion 42 on the side of the above side has an asymmetrical shape.

The outer curved portion 41 has a shape with a radius of curvature larger than the radius of curvature of the inner curved portion 42, and the thickness of the outer curved portion 41 is larger than the thickness of the inner curved portion 42. On the contrary, the inner curved portion 42 has a shape having a radius of curvature smaller than the radius of curvature of the outer curved portion 41, and the thickness of the inner curved portion 42 has a shape smaller than the thickness of the outer curved portion 41.

In this way, by making the radius of curvature of the outer curved portion 41 of the seal portion 27 larger than the radius of curvature of the inner curved portion 42, the seal portion 27 has two portions having different bending rigidity, that is, the bending rigidity is the outer curved portion 41. It is possible to realize a structure in which an inner curved portion 42 having a larger bending rigidity and an outer curved portion 41 having a bending rigidity smaller than that of the inner curved portion 42 coexist.

The seal portion 27 is a part of the seal surface 28 including the apex of the curved shape, and can be brought into contact with and separated from the seat surface 43 of the valve seat 26. The check valve 20 at the valve closing position has a pressure contact region where the seal surface 28 of the seal portion 27 is in pressure contact with the seat surface 43 of the valve seat 26, and a non-pressure contact region where the seal surface 28 and the seat surface 43 are separated from each other. To form. Then, as shown in FIG. 11, in the vicinity of the boundary between the pressure contact region and the non-pressure contact region, the inner liquid seal formed between the inner seal surface 44 and the seat surface 43 of the inner curved portion 42 of the non-pressure contact region. It has a gap 45 and also has an outer liquid sealing gap 47 formed between the outer sealing surface 46 and the seat surface 43 of the outer curved portion 41.

FIG. 6 shows a three-dimensional view of the valve member 22 viewed from diagonally above.

As shown in FIGS. 1, 4 to 5, and 8 to 12, the valve body 23 has a liquid sealing portion 50 on the lower surface 49 facing the inner plug 21. The liquid sealing portion 50 is located outside the opening 25 in the radial direction of the opening 25 of the inner plug 21 and is formed in an annular shape along the opening 25, and is formed from the lower surface 49 toward the upper surface 51 of the inner plug 21. It rises downward.

As shown in FIGS. 2 and 3, between the opening 25 and the valve seat 26 in the inner plug 21, a resin inflow mark 52 and a periphery of the resin inflow mark 52 are partially formed along the circumferential direction thereof. There is a recessed portion 53 as a recess. That is, the inner plug 21 is formed by injection molding using a mold, but the resin inflow mark 52 is a boundary between the gate as a passage for the molten resin provided in the mold and the molding space inside the mold. Is formed as a trace on a part of the surface of the inner plug 21 as a molded product. The depressed portion 53 is intentionally formed due to the design of the mold. The method of forming the depressed portion 53 can be appropriately changed.

In the valve closed state of the valve member 22 shown in FIG. 1, the sealing portion 27 of the valve body 23 is brought into close contact with the valve seat 26 as described above to seal the valve body 23, and the valve body 23 is sealed at a location other than the depressed portion 53. The liquid sealing portion 50 of the above is in close contact with the upper surface 51 of the inner plug 21. On the other hand, as shown in FIG. 11, in the recessed portion 53, a slight gap 54 as a liquid sealing gap is formed between the lower end surface of the liquid sealing portion 50 and the bottom surface of the depressed portion 53. The gap 54 is very small, and the distance between the lower end surface of the liquid sealing portion 50 and the bottom surface of the depressed portion 53 is about 0.01 to 0.1 mm, for example, 0.08 mm. The gap 54 constitutes a liquid sealing gap.

The valve member 22 is basically made of a thin film, the valve body 23 is formed to have a thickness of, for example, 0.2 mm, and the ridge of the liquid sealing portion 50 is formed to be, for example, 0.2 mm or less.

Therefore, the action of holding the content liquid by the surface tension of the content liquid acts between the lower surface 49 of the valve body 23 and the upper surface 51 of the inner plug 21. This action works strongly between the bottleneck, that is, the lower end surface of the liquid sealing portion 50 and the bottom surface of the depressed portion 53.

The intake port 31 of the main body 15 of the cap 11 shown in FIG. 1 communicates between the outer container 2 and the inner container 3. As described above, the air valve body 32 of the valve member 22 has a square shape or a fan shape extending outward from the outer peripheral edge of the support portion 24 in the radial direction of the main body 15. As shown in FIG. 1, the air valve body 32 is displaced over a valve closing position for closing the intake port 31 and a valve opening position for opening the intake port 31, and opens and closes the intake port 31. The air valve body 32 has a flat surface on the front surface side facing the intake port 23 as shown in FIG. 7, and has grid-like ribs 55 on the back surface side as shown in FIGS. 4 and 5.

Hereinafter, the operation in the above configuration will be described. When discharging the content liquid which is the content of the inner container 14, a pressing force is applied to the outer container 13, and this pressing force is applied to the inner container 14 through the air layer between the outer container 13 and the inner container 14. Give and squeeze the inner container 14.

Then, due to the increase in the internal pressure of the inner container 14, the valve body 23 transitions from the valve opening start state shown in FIG. 8 to the intermediate state shown in FIG. 9, and moves in a direction away from the opening 25 of the inner plug 21. At this time, since the valve body 23 has excellent responsiveness to the driving pressure, the seal portion 27 starts to separate from the valve seat 26 in the middle of this process. Further, the valve body 23 transitions from the intermediate state shown in FIG. 9 to the valve opening state shown in FIG. 10, and the seal portion 27 moves away from the valve seat 26 to the valve opening position as the valve body 23 moves. .. Then, the content liquid 57 of the inner container 14 passes between the seal portion 27 and the valve seat 26, and is pushed out from the discharge port 17 of the cap 11 shown in FIG.

At this time, as shown in detail in FIG. 11, since the seal portion 27 has a structure in which the inner curved portion 42 having a large bending rigidity and the outer curved portion 41 having a small bending rigidity coexist, the outer bending portion having a small bending rigidity is formed. The portion 41 can realize excellent responsiveness in which the seal portion 27 easily operates following the movement of the valve body 23.

When the squeezing force applied to the outer container 13 is released, the elastically deformed outer container 13 returns to its original shape due to the restoring force, and the internal space of the outer container 13 expands to form a decompressed body. Therefore, as shown by the alternate long and short dash line in FIG. 1, the air valve body 32 opens, and air flows in between the outer container 13 and the inner container 14 through the intake port 31.

The valve body 23 moves in the valve closing direction by its own restoring force, and the inside of the inner container 14 from which the pressing force is released is in a decompressed state, so that the pressure difference between the inside and outside of the container is used as the driving pressure to drive the inner plug 21. It is pressed in the direction approaching the opening 25 of. As the valve body 23 moves, the seal portion 27 moves to a valve closing position where it abuts on the valve seat 26, and seals between the seal surface 28 and the seat surface 43.

At this time, since the seal portion 27 has a structure in which the inner curved portion 42 having a large bending rigidity and the outer curved portion 41 having a small bending rigidity coexist, the valve body 23 that receives the driving pressure by the inner curved portion 42 having a large bending rigidity. The force applied to the seal portion 27 is surely applied to the seal surface 28, and a sufficient surface pressure necessary for sealing to prevent leakage of the contents can be secured between the seat surface 43 and the seal surface 28.

As shown in FIG. 11, in a valve closed state in which the seal surface 28 is in pressure contact with the seat surface 43, between the inner seal surface 44 on the inner circumference of the seal portion 27 and the seat surface 43 of the inner plug 21, and the seal portion 27. A liquid layer of the content liquid is formed by a capillary phenomenon between the outer sealing surface 46 on the outer periphery and the seat surface 43 of the inner plug 21.

That is, in the non-pressure contact region between the seal surface 28 and the seat surface 43, the inner liquid sealing gap 45 formed between the inner seal surface 44 and the seat surface 43 of the inner curved portion 42 and the outer curved portion 41. A liquid layer of the content liquid is formed in the outer liquid sealing gap 47 formed between the outer sealing surface 46 and the seat surface 43. The liquid layer of the content liquid formed on both sides of the inner seal surface 44 and the outer seal surface 46 forms a first liquid seal necessary for preventing oxidation of the content liquid, and the seal portion 27 and the valve seat are formed. Achieves a block of ventilation between and 26.

Further, when the valve body 23 returns from the valve opening position to the valve closing position, the liquid sealing portion 50 of the valve body 23 comes into contact with the upper surface 51 of the inner plug 21 as shown in FIG. 11, but at that time, the inner plug 21 is depressed. In the portion 53, as described above, a slight gap 54 is formed between the lower end surface of the liquid sealing portion 50 and the bottom surface of the depressed portion 53 to form a liquid sealing gap. As a result, the content liquid 57 remaining between the upper surface 51 of the inner plug 21 and the lower surface 49 of the valve body 23 is held in the gap 54, that is, the liquid sealing gap, and forms the second liquid sealing.

Specifically, as described above, the liquid sealing portion 50 of the valve body 23 is in contact with the upper surface 51 of the inner plug 21, so that the liquid collecting space shown in detail in FIG. 11 is between the liquid sealing portion 50 and the sealing portion 27. 58 is formed, and the content liquid that has not been discharged from the discharge port 17 shown in FIG. 1 can be retained in this liquid pool space 58. At this time, the excess liquid remaining in the liquid pool space 58 or the like reaches the opening 25 through the gap 54 and then flows down into the inner container 14. When a certain amount of the content liquid flows down into the inner container 14, the content liquid collects in the gap 58 due to surface tension, thereby forming a second liquid seal.

As a result, the first liquid seal and the second liquid seal can surely block the outside air from entering the inside of the inner container 14, and surely prevent the contents liquid of the inner container 14 from coming into contact with the outside air. can.

13 to 16 show caps of other embodiments of the invention. Here, as shown in FIGS. 13 and 14, the upper surface 51 of the inner plug 21 is not formed with the recessed portion 53 formed in the inner plug shown in FIGS. 2 and 3. Even if it is formed, it cannot be said that it is substantially depressed.

Then, in the embodiment of FIGS. 13 to 16, as shown in FIG. 16, the annular liquid sealing portion 50 formed in the valve body 23 of the valve member 22 has a constant angle range 60 along the circumferential direction. The low ridge portion 61 formed to have a ridge height lower than that of the other ranges is formed. In the range where the low ridge portion 61 is formed, as shown in detail in FIG. 15, a slight gap 54 is formed between the lower end surface of the low ridge portion 61 and the upper surface 51 of the inner plug 21. The distance between the lower end surface of the low ridge portion 61 and the upper surface 51 of the inner plug 21 in this gap 54 is about 0.01 to 0.1 mm, for example 0.08 mm, as in the previous embodiment. .. This gap 54 also constitutes a liquid sealing gap.

Similarly, in the embodiments of FIGS. 13 to 16, the liquid sealing effect due to the gap 54 can be expected. The gap 54 in the embodiment of FIGS. 13 to 16 can be formed in place of the gap 54 in the embodiment of FIGS. 1 to 12, or together with the gap 54 in the embodiment of FIGS. 1 to 12. It can also be formed. In the latter case, the depressed portion 53 of the inner plug 21 and the low raised portion 61 of the valve body 23 may be formed at different positions along the circumferential direction of the liquid sealing portion 50.

17-18 show caps of still other embodiments of the invention. Here, a downward protrusion 62 that can be in close contact with the seat surface 43 of the valve seat 26 formed on the upper surface 51 of the inner plug 21 is integrally formed on the seal portion 27 of the valve body 23 of the valve member 22. The protrusion 62 is formed along the circumferential direction of the seal portion 27, but as shown in FIG. 18, the valve member 22 has a portion having no protrusion in a certain range along the circumferential direction of the seal portion 27. 63 is provided. Alternatively, instead of this, the above-mentioned fixed range may be a portion where the protrusion amount of the protrusion is smaller than the other range.

Also in this case, a gap similar to the above is formed in the portion 63 having no protrusion or the portion where the protrusion amount of the protrusion is smaller than in other ranges, whereby a liquid sealing gap can be formed. The liquid sealing gaps of FIGS. 17 to 18 can be formed together with the gap 54 of FIGS. 1 to 12 and the gap 54 of FIGS. 13 to 16, or are formed in place of these gaps 54 and 54. You can also do it.

However, when formed together with the gap 54 of FIGS. 1 to 12 and the gap 54 of FIGS. 13 to 16, the portion 63 having no protrusion is located at a position away from the gap 54 along the circumferential direction of the valve body 23. It is preferable to provide it. This is because if they are in close proximity to each other, the content liquid to be retained in each part may be excessively returned to the inner container 14. Therefore, for example, when the depressed portion 53 exists at a position close to the air valve body 32 as shown in FIG. 1, and the protrusion 62 and the portion 63 having no protrusion are provided side by side, the protrusion is provided as shown in FIG. It is preferable that the portion 63 having no portion 63 is provided at a position away from the air valve body 32, for example, at a position 180 degrees away from the depressed portion 53 along the circumferential direction of the valve body 23.

FIG. 19 shows the cross-sectional structure of the main part of the cap according to still another embodiment of the present invention. In the embodiment of FIG. 19, the portion 65 of the valve body 23 of the valve member 22 in which the liquid hole 29 is formed is compared with the portion 65 of the embodiment of FIGS. 1 to 12 shown by virtual lines. The outer surface side of the portion 65 in which the liquid hole 29 is formed is reduced in thickness to form a thin wall. As a result, the opening / closing operability of the valve body 23 is improved.

FIG. 20 shows the cross-sectional structure of the main part of the cap according to still another embodiment of the present invention. In the embodiment of FIG. 20, the liquid sealing portion 66 of the inner plug 21 is integrated with the inner plug 21 by an annular protrusion protruding upward from the upper surface 51 of the inner plug 21 on the peripheral edge of the opening 25 in the inner plug 21. It is formed. Then, when the valve body 23 is closed as shown in the drawing, the inner peripheral surface of the liquid sealing portion 50 of the valve body 23 and the outer peripheral surface of the liquid sealing portion 66 of the inner plug 21 are in close contact with each other to perform sealing. It is configured in. Further, also in the configuration of FIG. 20, between the inner peripheral surface of the liquid sealing portion 50 of the valve body 23 and the liquid sealing portion 66 of the inner plug 21 within a certain range along the circumferential direction by means such as wall thinning. By forming a gap in the liquid sealing gap, the same liquid sealing gap as in other embodiments can be formed. In the illustrated example, the liquid sealing portion 66 of the inner plug 21 is provided on the peripheral edge of the opening 25 as described above, but the liquid sealing portion 66 is appropriately provided between the opening 25 and the valve seat 26 in the inner plug 21. Can be provided at the position of. In that case, the liquid sealing portion 50 of the valve body 23 is also provided at a position corresponding to the liquid sealing portion 50. Further, in the embodiment of FIG. 20, the inner surface side of the portion 67 between the portion 65 in the valve body 23 where the liquid hole 29 is formed and the outer curved portion 41 of the seal portion 27 is reduced in thickness. The portion 67 is formed to be thin. As a result, the opening / closing operability of the valve body 23 is improved.

FIG. 21 shows the cross-sectional structure of the main part of the cap according to still another embodiment of the present invention. In the embodiment of FIG. 21, the seal portion 68 of the valve body 23 is formed of a downwardly raised annular body similar to the liquid sealing portion 50, instead of the seal portion 27 of the previous embodiment. There is. As a result, the seal portion 68 is brought into contact with the valve seat 26 of the inner plug 21 in a form close to line contact. As a result, the contact pressure of the sealing portion 68 with the valve seat 26 is increased to improve the sealing function. Then, a gap similar to that between the liquid sealing portion 50 and the bottom surface of the recessed portion 53 can be formed between the sealing portion 68 and the valve seat 26 to form a similar liquid sealing gap. Further, in the embodiment of FIG. 21, the cross-sectional shape is different from that of the embodiment of FIG. 20, but similarly, in the valve body 23, between the portion 65 in which the liquid hole 29 is formed and the seal portion 68. The portion 69 is formed to be thin. As a result, the opening / closing operability of the valve body 23 is improved.

FIG. 22 shows the cross-sectional structure of the main part of the cap according to still another embodiment of the present invention. The embodiment of FIG. 22 is provided with the same sealing portion 68 as that of the embodiment of FIG. 21, but the opening / closing operability of the valve body 23 is improved by making the thickness thinner than that of the embodiment of FIG. The configuration for planning is different. In detail, the portion 67 between the portion 65 in which the liquid hole 29 is formed and the seal portion 68 in the valve body 23 has the same configuration as that shown in FIG.

11 Cap 20 Check valve 21 Inner plug 23 Valve body 25 Opening 26 Valve seat 27 Seal part 29 Liquid hole 49 Bottom surface 50 Liquid sealing part 51 Top surface 52 Resin inflow mark 53 Depression part 54 Gap 57 Contents Liquid 61 Low ridge part 62 Protrusion 63 Part without protrusion 68 Seal part

Claims (7)

A cap that is attached to the mouth of the container and has a check valve inside.
The check valve is placed at a position that closes the mouth of the container, and also covers the inner plug having an opening through which the liquid of the contents in the container flows out, the opening of the inner plug, and the upper surface of the inner plug around the opening. It has a valve body that is displaced over the valve opening position and the valve closing position in the axial direction of the opening of the inner plug.
The valve body has an annular seal portion that is in close contact with the upper surface of the inner plug around the opening when the valve body is in the closed position, and the inner peripheral side of the seal portion, from the lower surface of the valve body to the upper surface of the inner plug. It has a liquid sealing portion formed in an annular shape along the opening of the inner plug as well as being raised.
A cap characterized by having a liquid sealing gap between the liquid sealing portion and the upper surface of the inner plug. Claim 1 is characterized in that it has a recess formed in a certain range in the circumferential direction on the upper surface around the opening of the inner plug, which is recessed more than the other ranges, and a liquid sealing gap is formed by this recess. The cap described. The liquid-sealed portion of the valve body formed in an annular shape has a low ridge portion formed with a ridge height lower than that of other ranges in a certain range in the circumferential direction, and the low ridge portion and the upper surface of the inner plug The cap according to claim 1 or 2, wherein a liquid sealing gap is formed between the two. A protrusion protruding toward the upper surface of the inner plug is formed in the annular seal portion, and the seal portion has a portion having no protrusion in a certain range along the circumferential direction or a protrusion amount larger than that in other ranges. Has a small part,
Instead of between the liquid seal part of the valve body and the upper surface of the inner plug, or between the liquid seal part and the upper surface of the inner plug,
13. The cap according to any one item. The inner plug rises from the upper surface of the inner plug toward the valve body around the opening on the inner peripheral side of the liquid sealing part of the valve body, and the liquid sealing of the inner plug formed in a ring shape along the opening of the inner plug. The cap according to any one of claims 1 to 4, wherein the cap has a portion. The cap according to any one of claims 1 to 5, wherein a liquid sealing gap is also provided between the annular sealing portion and the upper surface of the inner plug. The cap according to any one of claims 1 to 6, wherein the valve body has a thin-walled portion for improving the displacement of the valve body over the valve opening position and the valve closing position.

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