JP2021008321A

JP2021008321A - cap

Info

Publication number: JP2021008321A
Application number: JP2019219992A
Authority: JP
Inventors: 晃弘後藤; Akihiro Goto; 桑垣　傳美; Tsutayoshi Kuwagaki; 傳美桑垣; 雄斗西村; Yuto Nishimura; 裕貴堀; Hirotaka Hori; 啓晃森; Keiko Mori; 平野　健; Takeshi Hirano; 健平野; 虎廣瀧下; Torahiro Takishita
Original assignee: Kikkoman Corp; Mikasa Sangyo Co Ltd
Current assignee: Kikkoman Corp; Mikasa Sangyo Co Ltd
Priority date: 2019-07-01
Filing date: 2019-12-05
Publication date: 2021-01-28
Anticipated expiration: 2039-12-05
Also published as: JP7403123B2

Abstract

To provide a cap improved in responsiveness of a check valve in opening and closing to a driving pressure and exerting excellent sealability.SOLUTION: In the cap, a check valve 8 includes an inside plug 9 having an opening 11 and a valve seat 12 formed around the opening 11, and a valve member 10 arranged so as to cover an opening 11 of an inside plug 9 and the valve seat 12; the valve member 10 has a valve body 13 displaced over a valve opening position and a valve closing position and a valve body supporting part 14 for supporting an outer peripheral edge of the valve body 13 to be attached to the inside plug 9; the valve body 13 has a seal part 16 formed in an annular shape along the outer peripheral edge of the valve body 13; the seal part 16 has a curved shape protruded toward the valve seat 12 in a cross section along an axial center of the opening 11 of the inside plug 9; in the curved shape, an outer curved part 18 at a liquid hole side is different in shape from an inner curved part 19 at an opening side of the inside plug 9, and the outer curved part 18 has a curvature radius larger than that of the inner curved part 19.SELECTED DRAWING: Figure 1

Description

本発明は、容器に装着するキャップに関し、キャップに内蔵する逆止弁の技術に係るものである。 The present invention relates to a cap to be mounted on a container and relates to a technique for a check valve built in the cap.

従来、醤油等の内容物を充填した容器において内容物の酸化を抑制する技術がある。これは、二重容器の内容器に醤油等の内容物を納め、内容器の口部にキャップを装着し、キャップの内部に配置した逆止弁の中栓の開口を弁体で封止するものである。 Conventionally, there is a technique for suppressing oxidation of contents in a container filled with contents such as soy sauce. This is done by putting the contents such as soy sauce in the inner container of the double container, attaching a cap to the mouth of the inner container, and sealing the opening of the inner plug of the check valve arranged inside the cap with the valve body. It is a thing.

このような容器およびキャップの構造を示した先行技術文献には、例えば特許文献１に記載するものがある。 Prior art documents showing the structures of such containers and caps include, for example, those described in Patent Document 1.

これは、二重容器の内容器の口部に中栓部材を装着し、中栓部材に設けた連通筒部内に弁体部を配置したものであり、弁体部が連通筒部内において容器軸心方向に沿って摺動する。弁体部は、容器軸心と同軸に配置された有底筒状をなし、容器軸心方向の上側端部に径方向外方に拡がる環状のフランジ部を有する。連通筒部の環状の上端面が弁座をなし、弁体部のフランジ部と当接して封止する。そして、弁体部が連通筒部内において容器軸心方向に沿って摺動することで、フランジ部と連通筒部の弁座間を開閉する。 In this method, an inner plug member is attached to the mouth of the inner container of the double container, and the valve body portion is arranged in the communication cylinder portion provided in the inner plug member, and the valve body portion is the container shaft in the communication cylinder portion. It slides along the direction of the heart. The valve body has a bottomed tubular shape arranged coaxially with the container axis, and has an annular flange portion extending outward in the radial direction at the upper end in the container axis direction. The annular upper end surface of the communication cylinder portion forms a valve seat, and is in contact with the flange portion of the valve body portion to seal. Then, the valve body portion slides in the communication cylinder portion along the direction of the container axis to open and close the valve seat between the flange portion and the communication cylinder portion.

また、特許文献２に記載するものは、図１４から図１８に示すようなものである。ここでは、容器本体１００が外容器１０１と内容器１０２からなる二重構造を有し、外容器１０１の口部にキャップ１０３を装着している。キャップ１０３は、外容器１０１の口部に嵌合するキャップ本体１０４と、キャップ本体１０４の上部に配置する蓋１０５からなる。キャップ本体１０４は、吐出口１０６を有し、蓋１０５に吐出口１０６を閉止する閉止部１０７を設けている。 Further, what is described in Patent Document 2 is as shown in FIGS. 14 to 18. Here, the container body 100 has a double structure including an outer container 101 and an inner container 102, and a cap 103 is attached to the mouth of the outer container 101. The cap 103 includes a cap body 104 that fits into the mouth of the outer container 101, and a lid 105 that is placed above the cap body 104. The cap body 104 has a discharge port 106, and the lid 105 is provided with a closing portion 107 for closing the discharge port 106.

キャップ１０３の内部には逆止弁１２０を配置している。逆止弁１２０は、内容器１０２の口部に装着する中栓１０８と、中栓１０８を覆って配置する弁部材１０９を備えている。弁部材１０９は、内容器１０２の軸心方向において中栓１０８に対向して配置する弁体１１０と、弁体１１０と一体をなし弁体１１０の外周縁を支持して中栓１０８に外嵌装着する弁体支持部１１１を有している。 A check valve 120 is arranged inside the cap 103. The check valve 120 includes an inner plug 108 attached to the mouth of the inner container 102 and a valve member 109 arranged so as to cover the inner plug 108. The valve member 109 is integrated with the valve body 110 arranged so as to face the inner plug 108 in the axial direction of the inner container 102, and is integrally fitted with the inner plug 108 to support the outer peripheral edge of the valve body 110. It has a valve body support portion 111 to be mounted.

中栓１０８は醤油等の内容物の液体が通過する開口１１２を有し、開口１１２の周囲が弁座１１３をなす。弁体１１０は中栓１０８の開口１１２を覆って弁座１１３に対向して配置し、開口１１２を囲み弁体１１０の周縁部に沿って形成したシール部１１４を有している。シール部１１４は、弁体１１０の一部をなし、弁体１１０の内面側において弁座１１３に向けて湾曲形状に突出し、弁体１１０の外面側において溝状に窪んだ形状をなす。シール部１１４は、中栓１０８の開口１１２の周囲の弁座１１３にシール面１１５が当接離間可能である。このシール部１１４よりも外側の位置において弁体１１０には複数の液穴１１６が開口している。 The inner plug 108 has an opening 112 through which a liquid of contents such as soy sauce passes, and the periphery of the opening 112 forms a valve seat 113. The valve body 110 is arranged so as to cover the opening 112 of the inner plug 108 and face the valve seat 113, and has a seal portion 114 formed along the peripheral edge portion of the valve body 110 surrounding the opening 112. The seal portion 114 forms a part of the valve body 110, protrudes in a curved shape toward the valve seat 113 on the inner surface side of the valve body 110, and has a groove-like recessed shape on the outer surface side of the valve body 110. In the seal portion 114, the seal surface 115 can be brought into contact with and separated from the valve seat 113 around the opening 112 of the inner plug 108. A plurality of liquid holes 116 are opened in the valve body 110 at a position outside the seal portion 114.

また、キャップ１０３は、吸気口１１７を有し、吸気口１１７が内容器１０２と外容器１０１の間に連通している。弁部材１０９は、吸気口１１７を開閉する空気弁部１１８を有し、空気弁部１１８は弁支持部１１１の外周縁からキャップ１０３の半径方向外側へ伸びる四角形状をなす。 Further, the cap 103 has an intake port 117, and the intake port 117 communicates between the inner container 102 and the outer container 101. The valve member 109 has an air valve portion 118 that opens and closes the intake port 117, and the air valve portion 118 has a rectangular shape extending from the outer peripheral edge of the valve support portion 111 to the outside in the radial direction of the cap 103.

このキャップ１０３において内容器１０２の内容物を吐出する際には、外容器１０１に圧搾力を加え、この圧搾力を外容器１０１と内容器１０２の間の空気層を介して内容器１０２に与えて内容器１０２を搾る。 When the contents of the inner container 102 are discharged by the cap 103, a pressing force is applied to the outer container 101, and this pressing force is applied to the inner container 102 via an air layer between the outer container 101 and the inner container 102. Squeeze the inner container 102.

このとき、内容器１０２の内圧の高まりにより弁体１１０は、図１８（ａ）に示す閉弁状態から図１８（ｂ）に示す中間状態へ遷移して、中栓１０８の開口１１２から離間する方向に移動する。さらに、弁体１１０は、図１８（ｂ）に示す中間状態から図１８（ｃ）に示す閉弁状態に遷移し、弁体１１０の移動に伴ってシール部１１４が弁座１１３から離間して開弁位置に移動し、図１６に示すように、内容器１０２の内容物がシール部１１４と弁座１１３の間を通り、キャップ１０３の吐出口１０６から押し出される。 At this time, due to the increase in the internal pressure of the inner container 102, the valve body 110 transitions from the valve closed state shown in FIG. 18A to the intermediate state shown in FIG. 18B, and is separated from the opening 112 of the inner plug 108. Move in the direction. Further, the valve body 110 transitions from the intermediate state shown in FIG. 18 (b) to the valve closed state shown in FIG. 18 (c), and the seal portion 114 is separated from the valve seat 113 as the valve body 110 moves. It moves to the valve opening position, and as shown in FIG. 16, the contents of the inner container 102 pass between the seal portion 114 and the valve seat 113 and are pushed out from the discharge port 106 of the cap 103.

また、外容器１０１に加える圧搾力を解除すると、弾性変形した外容器１０１が復元力により元の形状に戻ることで外容器１０１の内部空間が広がって負圧となる。このため、図１７に示すように、空気弁部１１８が開いて吸気口１１７を通して外容器１０１と内容器１０２の間に空気が流入する。 Further, when the pressing force applied to the outer container 101 is released, the elastically deformed outer container 101 returns to its original shape due to the restoring force, and the internal space of the outer container 101 expands to become a negative pressure. Therefore, as shown in FIG. 17, the air valve portion 118 opens and air flows in between the outer container 101 and the inner container 102 through the intake port 117.

また、加圧力が解除された内容器１０２の内部が負圧となることで、容器内外の圧力差を駆動圧として、弁体１１０の液弁部１１８が中栓１０８の開口１１２に接近する方向に押圧され、弁体１１０の移動に伴ってシール部１１４が弁座１１３に当接する閉弁位置に移動し、シール面１１５と弁座１１３の間を封止する。 Further, since the inside of the inner container 102 from which the pressing force is released becomes a negative pressure, the liquid valve portion 118 of the valve body 110 approaches the opening 112 of the inner plug 108 by using the pressure difference between the inside and outside of the container as the driving pressure. As the valve body 110 moves, the seal portion 114 moves to a valve closing position where it abuts on the valve seat 113, and seals between the seal surface 115 and the valve seat 113.

さらに、シール部１１４の内周面と中栓１０８の弁座１１３との間、およびシール部１１４の外周面と中栓１０８の弁座１１３との間に醤油等の内容物の液体の液層を保持して液封することで、内容器１０２に空気が侵入することを遮断する。 Further, a liquid layer of contents such as soy sauce is formed between the inner peripheral surface of the seal portion 114 and the valve seat 113 of the inner plug 108, and between the outer peripheral surface of the seal portion 114 and the valve seat 113 of the inner plug 108. By holding and sealing the liquid, the invasion of air into the inner container 102 is blocked.

特許第６４５０２４３号Patent No. 6450243 特開２０１９−４３６４４JP-A-2019-43644

上述した構成において、弁体１１０の移動に追従して生じるシール部１１４の稼働は、シール部１１４における弁体１１０の湾曲形状が曲率半径の大きい緩やかな曲がりであるほどに容易となり、シール部１１４における弁体１１０の湾曲形状が曲率半径の小さい急な曲がりであるほどに困難となる。 In the above-described configuration, the operation of the seal portion 114 that occurs following the movement of the valve body 110 becomes easier as the curved shape of the valve body 110 in the seal portion 114 is a gentle bend having a large radius of curvature, and the seal portion 114 The more the curved shape of the valve body 110 in the above is a sharp bend with a small radius of curvature, the more difficult it becomes.

例えば、一定の厚みを有する板材を水平方向に対して傾斜配置したときに、鉛直方向に沿った板材の断面形状は、水平方向に対する傾斜角度が大きくなるほどに鉛直方向に長くなり、傾斜角度が小さくなるほどに鉛直方向の長さが短くなる。 For example, when a plate material having a certain thickness is inclined with respect to the horizontal direction, the cross-sectional shape of the plate material along the vertical direction becomes longer in the vertical direction as the inclination angle with respect to the horizontal direction increases, and the inclination angle becomes smaller. Indeed, the length in the vertical direction becomes shorter.

このため、弁体１１０のシール部１１４の湾曲形状において、湾曲形状が曲率半径の大きい緩やかな曲がりであるほどに、中栓１０８の軸心方向におけるシール部１１４の断面の長さが短くなり、シール部１１４の湾曲形状が曲率半径の小さい急な曲がりであるほどに中栓１０８の軸心方向におけるシール部１１４の断面の長さが大きくなる。 Therefore, in the curved shape of the seal portion 114 of the valve body 110, the longer the curved shape is a gentle bend with a large radius of curvature, the shorter the length of the cross section of the seal portion 114 in the axial direction of the inner plug 108. The sharper the curved shape of the seal portion 114 with a smaller radius of curvature, the larger the length of the cross section of the seal portion 114 in the axial direction of the inner plug 108.

一般に、部材の曲げ剛性は、断面二次モーメントが大きくなるほどに大きくなる。したがって、シール部１１４は湾曲形状が曲率半径の大きい緩やかな曲がりであるほど曲げ剛性が小さく、湾曲形状が曲率半径の小さい急な曲がりであるほど曲げ剛性が大きくなる。この結果、弁体１１０の移動に追従して生じるシール部１１４の稼働は、シール部１１４における弁体１１０の湾曲形状が曲率半径の大きい緩やかな曲がりであるほどに容易となり、駆動圧に対する弁体１１０の応答性が良くなる。 In general, the flexural rigidity of a member increases as the moment of inertia of area increases. Therefore, the bending rigidity of the seal portion 114 decreases as the curved shape has a large radius of curvature and the bending rigidity increases, and the bending rigidity increases as the curved shape has a sharp bending with a small radius of curvature. As a result, the operation of the seal portion 114 that occurs following the movement of the valve body 110 becomes easier as the curved shape of the valve body 110 in the seal portion 114 becomes a gentle bend having a large radius of curvature, and the valve body with respect to the driving pressure. The responsiveness of 110 is improved.

逆に、シール部１１４における弁体１１０の湾曲形状が曲率半径の小さい急な曲がりであるほどに、弁体１１０の移動に追従して生じるシール部１１４の稼働は困難となり、駆動圧に対する弁体１１０の応答性が悪くなる。 On the contrary, the more the curved shape of the valve body 110 in the seal portion 114 is a sharp bend with a small radius of curvature, the more difficult it becomes for the seal portion 114 to operate following the movement of the valve body 110, and the valve body with respect to the driving pressure. The responsiveness of 110 becomes poor.

一方、駆動圧を受ける弁体１１０からシール部１１４のシール面に伝わる力は、シール部１１４の湾曲形状が曲率半径の大きい緩やかな曲がりであるほどに、換言すると曲げ剛性が小さいほどに弱くなり、結果としてシール部１１４のシール面と弁座１１３との面圧が低くなる。また、シール部１１４のシール面に伝わる力は、シール部１１４の湾曲形状が曲率半径の小さい急な曲がりであるほどに、換言すると曲げ剛性が大きいほどに強くなり、結果としてシール部１１４のシール面と弁座１１３との面圧が高くなる。 On the other hand, the force transmitted from the valve body 110 that receives the driving pressure to the seal surface of the seal portion 114 becomes weaker as the curved shape of the seal portion 114 is a gentle bend with a large radius of curvature, in other words, as the bending rigidity is smaller. As a result, the surface pressure between the sealing surface of the sealing portion 114 and the valve seat 113 becomes low. Further, the force transmitted to the seal surface of the seal portion 114 becomes stronger as the curved shape of the seal portion 114 is a sharp bend with a smaller radius of curvature, in other words, the greater the bending rigidity, and as a result, the seal of the seal portion 114 is sealed. The surface pressure between the surface and the valve seat 113 increases.

本発明は上記した課題を解決するものであり、駆動圧に対する逆止弁の開閉の応答性を向上させ、かつ優れたシール性を発揮するキャップを提供することを目的とする。 The present invention solves the above-mentioned problems, and an object of the present invention is to provide a cap that improves the responsiveness of opening and closing the check valve to a driving pressure and exhibits excellent sealing performance.

上記した課題を解決するために、本発明のキャップは、容器の口部に装着し、内部に逆止弁を有するキャップであり、逆止弁は、容器の口部を塞ぐ位置に配置し、容器内の内容物が流れ出る開口および開口の周囲に形成した弁座を有する中栓と、中栓の開口および弁座を覆って配置する弁部材を備え、
弁部材は、中栓の開口および弁座に対向して配置し、中栓の開口の軸心方向において開弁位置と閉弁位置とにわたって変位する弁体と、弁体と一体をなし弁体の外周縁を支持して中栓に装着する弁体支持部を有し、弁体は、中栓の開口を囲み弁体の外周縁に沿って環状に形成したシール部と、中栓の開口の半径方向においてシール部よりも外側の位置に形成した液穴を有し、シール部は、中栓の開口の軸心に沿った断面において、弁座に向けて突出する湾曲形状を有し、湾曲形状は、液穴側の外側湾曲部と中栓の開口側の内側湾曲部との形状が異なり、外側湾曲部は内側湾曲部の曲率半径よりも大きい曲率半径を有することを特徴とする。 In order to solve the above-mentioned problems, the cap of the present invention is a cap that is attached to the mouth of the container and has a check valve inside, and the check valve is arranged at a position that closes the mouth of the container. An inner plug having an opening through which the contents in the container flow out and a valve seat formed around the opening, and a valve member arranged over the opening of the inner plug and the valve seat.
The valve member is arranged so as to face the opening of the inner plug and the valve seat, and is integrated with the valve body and the valve body which is displaced between the valve opening position and the valve closing position in the axial direction of the opening of the inner plug. The valve body has a valve body support portion that supports the outer peripheral edge of the valve body and is attached to the inner plug, and the valve body has a seal portion that surrounds the opening of the inner plug and is formed in an annular shape along the outer peripheral edge of the valve body, and an opening of the inner plug. It has a liquid hole formed at a position outside the seal portion in the radial direction of the seal portion, and the seal portion has a curved shape protruding toward the valve seat in a cross section along the axis of the opening of the inner plug. The curved shape is characterized in that the outer curved portion on the liquid hole side and the inner curved portion on the opening side of the inner plug are different in shape, and the outer curved portion has a radius of curvature larger than the radius of curvature of the inner curved portion.

本発明のキャップにおいて、シール部は、内側湾曲部の曲率半径よりも大きい曲率半径を有する外側湾曲部が内側湾曲部の曲がり剛性より小さい曲がり剛性を有し、曲がり剛性が大きい内側湾曲部と曲がり剛性が小さい外側湾曲部との曲がり剛性が異なる二つの部位が共存する構造をなすことを特徴とする。 In the cap of the present invention, in the seal portion, the outer curved portion having a radius of curvature larger than the radius of curvature of the inner curved portion has a bending rigidity smaller than the bending rigidity of the inner curved portion, and the inner curved portion and the bending portion having a large bending rigidity are bent. It is characterized by forming a structure in which two parts having different bending rigidity from the outer curved portion having low rigidity coexist.

本発明のキャップにおいて、シール部は、弁体の無負荷状態において、湾曲形状の頂点を境として液穴側が外側湾曲部をなし、中栓の開口側が内側湾曲部をなし、外側湾曲部と内側湾曲部が非対称な形状をなすことを特徴とする。 In the cap of the present invention, the seal portion has an outer curved portion on the liquid hole side and an inner curved portion on the opening side of the inner plug with the apex of the curved shape as a boundary in the no-load state of the valve body, and the outer curved portion and the inner side. It is characterized in that the curved portion has an asymmetrical shape.

本発明のキャップにおいて、逆止弁は、シール部のシール面の一部が中栓の弁座の弁座面に圧接する閉弁状態で、シール面と弁座面の間の非圧接領域において、外側湾曲部の外側シール面と弁座面の間に外側液封用間隙を形成し、内側湾曲部の内側シール面と弁座面の間に内側液封用間隙を形成し、外側液封用間隙を内側液封用間隙よりも狭く形成することを特徴とする。 In the cap of the present invention, the check valve is in a closed state in which a part of the seal surface of the seal portion is in pressure contact with the valve seat surface of the valve seat of the inner plug, and in the non-pressure contact region between the seal surface and the valve seat surface. , An outer liquid sealing gap is formed between the outer sealing surface and the valve seat surface of the outer curved portion, and an inner liquid sealing gap is formed between the inner sealing surface and the valve seat surface of the inner curved portion. It is characterized in that the gap is formed narrower than the inner liquid sealing gap.

本発明のキャップにおいて、逆止弁は、シール部のシール面が弁座の弁座面に圧接する圧接領域と、シール面と弁座面が離間する非圧接領域を形成し、圧殺領域と非圧接領域との境の近傍において、外側シール面に対する接線と弁座面との成す角度θ_１が、内側シール面に対する接線と弁座面との成す角度θ_２よりも小さくなることを特徴とする。 In the cap of the present invention, the check valve forms a pressure contact region in which the seal surface of the seal portion is in pressure contact with the valve seat surface of the valve seat and a non-pressure contact region in which the seal surface and the valve seat surface are separated from each other. In the vicinity of the boundary with the pressure contact region, the angle θ ₁ formed by the tangent to the outer sealing surface and the valve seat surface is smaller than the angle θ ₂ formed by the tangent to the inner sealing surface and the valve seat surface. ..

本発明のキャップにおいて、中栓の弁座の弁座面は、シール部に当接する平面状弁座面と、平面状弁座面から立ち上がり、シール部の内側湾曲部の内側シール面に対向する曲面状弁座面からなり、シール部が平面状弁座面と曲面状弁座面にわたって圧接することを特徴とする。 In the cap of the present invention, the valve seat surface of the valve seat of the inner plug rises from the flat valve seat surface that abuts on the seal portion and the flat valve seat surface and faces the inner seal surface of the inner curved portion of the seal portion. It is composed of a curved valve seat surface, and the seal portion is pressure-welded over the flat valve seat surface and the curved valve seat surface.

本発明のキャップにおいて、逆止弁は、シール部のシール面の一部が中栓の弁座の弁座面に圧接する閉弁状態で、シール面と弁座面の間の非圧接領域において、外側湾曲部の外側シール面と平面状弁座面の間に外側液封用間隙を形成し、内側湾曲部の内側シール面と曲面状弁座面の間に内側液封用間隙を形成し、内側液封用間隙を外側液封用間隙よりも狭く形成することを特徴とする。 In the cap of the present invention, the check valve is in a closed state in which a part of the seal surface of the seal portion is in pressure contact with the valve seat surface of the valve seat of the inner plug, and in the non-pressure contact region between the seal surface and the valve seat surface. , An outer liquid sealing gap is formed between the outer sealing surface of the outer curved portion and the flat valve seat surface, and an inner liquid sealing gap is formed between the inner sealing surface of the inner curved portion and the curved valve seat surface. It is characterized in that the inner liquid sealing gap is formed narrower than the outer liquid sealing gap.

本発明のキャップにおいて、内側シール面と曲面状弁座面の間に形成する内側液封用間隙が上方に向けて開口することを特徴とする。 The cap of the present invention is characterized in that the inner liquid sealing gap formed between the inner sealing surface and the curved valve seat surface opens upward.

本発明のキャップにおいて、逆止弁は、シール部のシール面が弁座の弁座面に圧接する圧接領域と、シール面と弁座面が離間する非圧接領域を形成し、圧殺領域と非圧接領域との境の近傍において、内側シール面に対する接線と曲面状弁座面に対する接線との成す角度θ_３が、外側シール面に対する接線と平面状弁座面との成す角度θ_４よりも小さくなることを特徴とする。 In the cap of the present invention, the check valve forms a pressure contact region in which the seal surface of the seal portion is in pressure contact with the valve seat surface of the valve seat and a non-pressure contact region in which the seal surface and the valve seat surface are separated from each other. In the vicinity of the boundary with the pressure contact region, the angle θ ₃ formed by the tangent to the inner sealing surface and the tangent to the curved valve seat surface is smaller than the angle θ ₄ formed by the tangent to the outer sealing surface and the flat valve seat surface. It is characterized by becoming.

上記した構成により、シール部の外側湾曲部の曲率半径を内側湾曲部の曲率半径よりも大きくすることで、シール部に曲がり剛性が異なる二つの部位、すなわち曲がり剛性の大きい内側湾曲部と曲がり剛性の小さい外側湾曲部が共存する構造を実現できる。 With the above configuration, the radius of curvature of the outer curved portion of the seal portion is made larger than the radius of curvature of the inner curved portion, so that the seal portion has two parts having different bending rigidity, that is, the inner curved portion having a large bending rigidity and the bending rigidity. It is possible to realize a structure in which a small outer curved portion coexists.

このため、曲がり剛性の小さい外側湾曲部により、弁体の移動に追従してシール部が容易に稼働する優れた応答性を実現でき、曲がり剛性の大きい内側湾曲部により、駆動圧を受ける弁体からシール部に加わる力を確実にシール面に作用させて弁座面とシール面との間に内容物の漏出を防止する封止に必要な十分な面圧を確保できる。 For this reason, the outer curved portion having a small bending rigidity can realize excellent responsiveness in which the seal portion easily operates following the movement of the valve body, and the inner curved portion having a large bending rigidity receives the driving pressure. It is possible to secure a sufficient surface pressure necessary for sealing to prevent leakage of the contents between the valve seat surface and the seal surface by surely applying a force applied to the seal portion to the seal surface.

シール面が弁座面に圧接する閉弁状態で、シール部の内周の内側シール面と中栓の弁座面との間、およびシール部の外周の外側シール面と中栓の弁座面との間に毛管現象により内容物の液層が形成される。 In a closed state where the seal surface is in pressure contact with the valve seat surface, between the inner seal surface on the inner circumference of the seal and the valve seat surface of the inner plug, and the outer seal surface on the outer circumference of the seal and the valve seat surface of the inner plug. A liquid layer of the contents is formed between the two by the capillary phenomenon.

この際に、外側湾曲部の曲率半径が内側湾曲部の曲率半径よりも大きいことで、シール面と弁座面の間の非圧接領域において、外側湾曲部の外側シール面と弁座面の間に形成する外側液封用間隙は、内側湾曲部の内側シール面と弁座面の間に形成する内側液封用間隙よりも狭くなり、表面張力が強まることで毛管現象により保持する液層を確実に保持できる。このため、内容物の酸化を防止するために必要なシール部と弁座間の通気の遮断を確実に実現できる。 At this time, since the radius of curvature of the outer curved portion is larger than the radius of curvature of the inner curved portion, in the non-pressure contact region between the sealing surface and the valve seat surface, between the outer sealing surface and the valve seat surface of the outer curved portion. The outer liquid sealing gap formed in is narrower than the inner liquid sealing gap formed between the inner sealing surface and the valve seat surface of the inner curved portion, and the surface tension is increased to hold the liquid layer by capillary action. Can be held securely. Therefore, it is possible to surely block the ventilation between the seal portion and the valve seat, which is necessary to prevent the contents from being oxidized.

また、中栓の弁座面が平面状弁座面と曲面状弁座面からなり、シール部が平面状弁座面と曲面状弁座面にわたって圧接するので、駆動圧を受ける弁体からシール部の内側湾曲部に加わる力が方向を違えて平面状弁座面と曲面状弁座面に向けて作用し、シール部のシール面を平面状弁座面と曲面状弁座面に確実に圧接させて、弁座面とシール面との間に内容物の漏出を防止する封止に必要な十分な面圧を確保できる。 Further, since the valve seat surface of the inner plug is composed of a flat valve seat surface and a curved valve seat surface, and the seal portion presses and contacts the flat valve seat surface and the curved valve seat surface, the valve body that receives the driving pressure is sealed. The force applied to the inner curved part of the part acts in different directions toward the flat valve seat surface and the curved valve seat surface, and the sealing surface of the seal part is surely applied to the flat valve seat surface and the curved valve seat surface. By pressure contacting, sufficient surface pressure required for sealing to prevent leakage of the contents can be secured between the valve seat surface and the sealing surface.

内側湾曲部の内側シール面と曲面状弁座面の間に形成する内側液封用間隙が上方に向けて開口するので、毛管現象により保持する液層が振動等よって漏出することがなくなり、液層をより確実に保持できる。このため、内容物の酸化を防止するために必要なシール部と弁座間の通気の遮断をより確実に実現できる。 Since the inner liquid sealing gap formed between the inner sealing surface of the inner curved portion and the curved valve seat surface opens upward, the liquid layer held by the capillary phenomenon does not leak due to vibration or the like, and the liquid is prevented from leaking. The layer can be held more reliably. Therefore, it is possible to more reliably block the ventilation between the seal portion and the valve seat, which is necessary to prevent oxidation of the contents.

この際に、シール面と弁座面の間の非圧接領域において、内側湾曲部の内側シール面と弁座面の間に形成する内側液封用間隙は、外側湾曲部の外側シール面と弁座面の間に形成する外側液封用間隙よりも狭くなり、表面張力が強まることで毛管現象により保持する液層を確実に保持できる。 At this time, in the non-pressure contact region between the seal surface and the valve seat surface, the inner liquid sealing gap formed between the inner seal surface and the valve seat surface of the inner curved portion is the outer seal surface of the outer curved portion and the valve. It is narrower than the outer liquid sealing gap formed between the seat surfaces, and the surface tension is increased so that the liquid layer held by the capillary phenomenon can be reliably held.

本発明の実施の形態におけるキャップを示す断面図Sectional drawing which shows the cap in embodiment of this invention 同実施の形態における中栓を示す平面図Top view showing the inner plug in the same embodiment 図２のＡ−Ａ矢視断面図Cross-sectional view taken along the line AA of FIG. 同中栓の背面図Rear view of the inner plug 同実施の形態における弁部材を示す平面図Top view showing the valve member in the same embodiment 図５のＢ−Ｂ矢視断面図Cross-sectional view taken along the line BB in FIG. 同弁部材の背面図Rear view of the valve member 同中栓の斜視図Perspective view of the inner plug 同弁部材の斜視図Perspective view of the valve member 同実施の形態の逆止弁の作動を示し、（ａ）は閉弁状態を示す図、（ｂ）は中間状態を示す図、（ｃ）は開弁状態を示す図The operation of the check valve of the same embodiment is shown, (a) is a diagram showing a valve closed state, (b) is a diagram showing an intermediate state, and (c) is a diagram showing a valve open state. 同逆止弁を示す部分拡大断面図Partially enlarged cross-sectional view showing the check valve 本発明の他の実施の形態における中栓に弁部材を組み付けた逆止弁を示す断面図Sectional drawing which shows the check valve which attached the valve member to the inner plug in another embodiment of this invention. 同中栓に弁部材を組み付けた逆止弁の部分拡大断面図Partially enlarged cross-sectional view of the check valve with the valve member assembled to the inner plug 従来の逆止弁を示す部分拡大断面図Partially enlarged cross-sectional view showing a conventional check valve 従来のキャップを示す断面図Sectional view showing a conventional cap 同キャップの液弁構造を示す部分拡大断面図Partially enlarged cross-sectional view showing the liquid valve structure of the cap 同キャップの空気弁構造を示す部分拡大断面図Partially enlarged cross-sectional view showing the air valve structure of the cap 従来の逆止弁の作動を示し、（ａ）は閉弁状態を示す図、（ｂ）は中間状態を示す図、（ｃ）は開弁状態を示す図The operation of the conventional check valve is shown, (a) is a diagram showing a valve closed state, (b) is a diagram showing an intermediate state, and (c) is a diagram showing a valve open state.

（実施例１）
以下、本発明の実施の形態を図面に基づいて説明する。図１から図１１に示すように、本実施の形態では、容器本体１が外容器２と内容器３からなる二重構造を有している。容器本体１の口部にはキャップ４を装着している。キャップ４は、キャップ本体５と蓋（図示省略）からなり、キャップ本体５と蓋が一体に成型されている。ここでは、蓋の構造を開示しないが、先に図１３で説明したものと同様であり、説明を省略する。 (Example 1)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 11, in the present embodiment, the container body 1 has a double structure including an outer container 2 and an inner container 3. A cap 4 is attached to the mouth of the container body 1. The cap 4 includes a cap body 5 and a lid (not shown), and the cap body 5 and the lid are integrally molded. Although the structure of the lid is not disclosed here, it is the same as that described above with reference to FIG. 13, and the description thereof will be omitted.

キャップ本体５は、外容器２の口部外周に螺合装着しており、頂部に形成した注ぎ口部６に吐出口７を有している。キャップ４の内部には逆止弁８を配置している。 The cap body 5 is screwed and mounted on the outer periphery of the mouth portion of the outer container 2, and has a discharge port 7 at the spout portion 6 formed at the top. A check valve 8 is arranged inside the cap 4.

逆止弁８は中栓９と弁部材１０を備えており、図２から図４に示すように、内容器３の口部を塞ぐ位置に配置する中栓９は、醤油等の内容物の液体が通過する開口１１を有し、開口１１の周囲が弁座１２をなす。中栓９は弁座１２の外周に環状溝９ａを有し、環状溝９ａの外周に拡がる外縁部９ｂに複数の切欠き部９ｃを有している。切欠き部９ｃはキャップ本体５の内部に形成した突起（図示省略）と係合し、開口１１の軸心廻りにおいて中栓９を位置決めする。 The check valve 8 includes an inner plug 9 and a valve member 10, and as shown in FIGS. 2 to 4, the inner plug 9 arranged at a position of closing the mouth of the inner container 3 is a content such as soy sauce. It has an opening 11 through which a liquid passes, and the periphery of the opening 11 forms a valve seat 12. The inner plug 9 has an annular groove 9a on the outer periphery of the valve seat 12, and has a plurality of notches 9c on the outer edge portion 9b extending to the outer periphery of the annular groove 9a. The notch 9c engages with a protrusion (not shown) formed inside the cap body 5 to position the inner plug 9 around the axis of the opening 11.

また、中栓９の環状溝９ａの内周面には弁部材１０を位置決めする突起９ｄが形成されている。突起９ｄに対応する位置にある切欠き部９ｃは、両端縁がそれぞれ２１度の角度θ_βで扇状に拡がっている。 Further, a protrusion 9d for positioning the valve member 10 is formed on the inner peripheral surface of the annular groove 9a of the inner plug 9. Notched portions 9c in a position corresponding to the projection 9d, the end edges has spread in a fan shape at an angle theta _beta of each 21 °.

図５から図７に示すように、弁部材１０は、中栓９の開口１１および弁座１２を覆って配置しており、弁体１３と弁体支持部１４と空気弁部１５を有している。 As shown in FIGS. 5 to 7, the valve member 10 is arranged so as to cover the opening 11 of the inner plug 9 and the valve seat 12, and has a valve body 13, a valve body support portion 14, and an air valve portion 15. ing.

弁体１３は、中栓９の開口１１および弁座１２に対向し、中栓９の開口１１の軸心方向において開弁位置と閉弁位置とにわたって弾性変位する。弁体支持部１４は、弁体１３と一体をなし弁体１３の外周縁を支持しており、中栓９の環状溝９ａに嵌合装着している。弁体支持部１４は内周面に中栓９の突起９ｄに嵌合する凹部１４ａを有している。 The valve body 13 faces the opening 11 of the inner plug 9 and the valve seat 12, and elastically displaces between the valve opening position and the valve closing position in the axial direction of the opening 11 of the inner plug 9. The valve body support portion 14 is integrated with the valve body 13 to support the outer peripheral edge of the valve body 13, and is fitted and mounted in the annular groove 9a of the inner plug 9. The valve body support portion 14 has a recess 14a on the inner peripheral surface that fits into the protrusion 9d of the inner plug 9.

弁体１３は、中栓９の開口１１を囲み弁体１３の外周縁に沿って環状に形成したシール部１６と、中栓９の開口１１の半径方向においてシール部１６よりも外側の位置に形成した液穴１７を有している。 The valve body 13 has a seal portion 16 formed in an annular shape along the outer peripheral edge of the valve body 13 surrounding the opening 11 of the inner plug 9, and a position outside the seal portion 16 in the radial direction of the opening 11 of the inner plug 9. It has the formed liquid hole 17.

シール部１６は、図６および図１１に示すように、中栓９の開口１１の軸心に沿った断面において、弁座１２に向けて突出しており、弁体１３の一部を湾曲形状に形成したものである。すなわち、シール部１６は、弁座１２に対向する弁体１３の内面側において弁座１２に向けて湾曲形状に突出し、弁体１３の外面側において溝状に窪んだ形状をなす。 As shown in FIGS. 6 and 11, the seal portion 16 projects toward the valve seat 12 in a cross section along the axis of the opening 11 of the inner plug 9, and a part of the valve body 13 has a curved shape. It is formed. That is, the seal portion 16 projects in a curved shape toward the valve seat 12 on the inner surface side of the valve body 13 facing the valve seat 12, and has a groove-like recessed shape on the outer surface side of the valve body 13.

シール部１６の湾曲形状は、液穴１７に臨む側の外側湾曲部１８と中栓９の開口１１に臨む側の内側湾曲部１９との形状が異なっている。すなわち、シール部１６は、弁体１３に強制力が作用しない自然下の無負荷状態において、湾曲形状の頂点を境とする液穴１７の側の外側湾曲部１８と中栓９の開口１１の側の内側湾曲部１９とが非対称な形状をなしている。 The curved shape of the seal portion 16 is different between the outer curved portion 18 on the side facing the liquid hole 17 and the inner curved portion 19 on the side facing the opening 11 of the inner plug 9. That is, the seal portion 16 has an outer curved portion 18 on the side of the liquid hole 17 with the apex of the curved shape as a boundary and an opening 11 of the inner plug 9 in a natural no-load state in which a forcing force does not act on the valve body 13. The inner curved portion 19 on the side has an asymmetrical shape.

そして、外側湾曲部１８は、内側湾曲部１９の曲率半径よりも大きい曲率半径の形状をなし、中栓９の開口１１の軸心と平行な方向において外側湾曲部１８の厚みが内側湾曲部１９の厚みより小さい形状をなす。 The outer curved portion 18 has a shape with a radius of curvature larger than the radius of curvature of the inner curved portion 19, and the thickness of the outer curved portion 18 is increased in the direction parallel to the axis of the opening 11 of the inner plug 9. The shape is smaller than the thickness of.

また、内側湾曲部１９は、外側湾曲部１８の曲率半径よりも小さい曲率半径の形状をなし、中栓９の開口１１の軸心と平行な方向において内側湾曲部１９の厚みが外側湾曲部１８の厚みより大きい形状をなす。 Further, the inner curved portion 19 has a shape having a radius of curvature smaller than the radius of curvature of the outer curved portion 18, and the thickness of the inner curved portion 19 is the outer curved portion 18 in a direction parallel to the axis of the opening 11 of the inner plug 9. The shape is larger than the thickness of.

このように、シール部１６の外側湾曲部１８の曲率半径を内側湾曲部１９の曲率半径よりも大きくすることで、シール部１６に曲がり剛性が異なる二つの部位、すなわち曲がり剛性が外側湾曲部１８よりも大きい内側湾曲部１９と曲がり剛性が内側湾曲部１９よりも小さい外側湾曲部１８が共存する構造を実現できる。 In this way, by making the radius of curvature of the outer curved portion 18 of the seal portion 16 larger than the radius of curvature of the inner curved portion 19, the seal portion 16 has two portions having different bending rigidity, that is, the bending rigidity is the outer curved portion 18. It is possible to realize a structure in which an inner curved portion 19 having a larger bending rigidity and an outer curved portion 18 having a bending rigidity smaller than that of the inner curved portion 19 coexist.

シール部１６は、湾曲形状の頂点を含むシール面２０の一部で、弁座１２の弁座面２１に当接離間可能である。そして、閉弁位置にある逆止弁８は、シール部１６のシール面２０が弁座１２の弁座面２１に圧接する圧接領域と、シール面２０と弁座面２１が離間する非圧接領域を形成し、圧殺領域と非圧接領域との境の近傍において、外側シール面２０ｂに対する接線と弁座面２１との成す角度θ_１が、内側シール面２０ａに対する接線と弁座面２１との成す角度θ_２よりも小さくなる。 The seal portion 16 is a part of the seal surface 20 including the apex of the curved shape, and can be brought into contact with and separated from the valve seat surface 21 of the valve seat 12. The check valve 8 at the valve closing position has a pressure contact region in which the seal surface 20 of the seal portion 16 is in pressure contact with the valve seat surface 21 of the valve seat 12, and a non-pressure contact region in which the seal surface 20 and the valve seat surface 21 are separated from each other. In the vicinity of the boundary between the crushing region and the non-pressing region, the angle θ ₁ formed by the tangent to the outer sealing surface 20b and the valve seat surface 21 is formed by the tangent to the inner sealing surface 20a and the valve seat surface 21. It is smaller than the angle θ ₂ .

液穴１７は、シール部１６に沿った複数個所において、弁体１３と弁体支持部１４の肩部とにわたって開口しており、後述するように、従来よりも大きく開口している。 The liquid holes 17 are opened over the valve body 13 and the shoulder portion of the valve body support portion 14 at a plurality of locations along the seal portion 16, and are opened larger than the conventional ones as will be described later.

キャップ本体５は、天部に形成した吸気部２２に吸気口２３が開口しており、吸気口２３が外容器２と内容器３の間に連通している。 The cap body 5 has an intake port 23 open to an intake portion 22 formed at the top, and the intake port 23 communicates between the outer container 2 and the inner container 3.

弁部材１０の空気弁部１５は、弁体支持部１４の外周縁からキャップ本体５の半径方向外側へ伸びる扇形状をなし、両端縁がそれぞれ５度の角度θ_αで広がっている。空気弁部１５は吸気口２３を閉塞する閉弁位置と吸気口２３を開放する開弁位置とにわたって変位し、吸気口２３を開閉する。空気弁部１５は吸気口２３に対向する表面側が平坦面をなし、背面側に格子状のリブ１５ａを備えている。 Air valve portion 15 of the valve member 10 forms a fan shape that extends from the outer periphery of the valve support portion 14 radially outwardly of the cap body 5, both end edges are spread at an angle theta _alpha of 5 degrees, respectively. The air valve portion 15 is displaced over a valve closing position that closes the intake port 23 and a valve opening position that opens the intake port 23, and opens and closes the intake port 23. The air valve portion 15 has a flat surface on the front surface side facing the intake port 23, and is provided with grid-like ribs 15a on the back surface side.

弁部材１０は基本的に薄膜に形成しており、弁体１３および空気弁部１５は０．２ｍｍの厚みに形成している。ここで、先に説明した従来の弁体と本実施の形態における弁体１３および空気弁部１５の違いについて説明する。 The valve member 10 is basically formed into a thin film, and the valve body 13 and the air valve portion 15 are formed to have a thickness of 0.2 mm. Here, the difference between the conventional valve body described above and the valve body 13 and the air valve portion 15 in the present embodiment will be described.

従来の弁体は、材質がＥＰＤＭ（エチレンプロピレンジエンゴム）であり、弁体の厚みが０．４ｍｍであった。このＥＰＤＭは硬度ショアＡ４０程度の柔らかさを有しているので、弁体の応答性が良い特質を有する。一方で、柔らかさのために、薄くすると形状を維持することが困難となる場合があり、厚みは０．４ｍｍが限界であり、これ以上に薄くするとシール部のシール性を確保することが困難となる。このため、シール部は曲率半径の小さい形状に形成しており、液穴も小さく開口せざるを得なかった。 The conventional valve body is made of EPDM (ethylene propylene diene rubber) and has a valve body thickness of 0.4 mm. Since this EPDM has a hardness of about A40, it has a characteristic that the responsiveness of the valve body is good. On the other hand, due to its softness, it may be difficult to maintain its shape if it is made thinner, and the thickness is limited to 0.4 mm, and if it is made thinner than this, it is difficult to secure the sealing property of the sealing portion. It becomes. For this reason, the seal portion is formed in a shape having a small radius of curvature, and the liquid hole has to be opened small.

本実施の形態では、弁部材１０の材質としてＰＥ（ポリエチレン）を採用しており、超低密度ＰＥに軟化剤を添加して硬度ショアＡ７５程度の柔らかさに調整している。このため、弁部材１０の弁体１３および空気弁部１５を０．２ｍｍの薄膜に形成しても形状を維持することが可能となった。この結果、シール部１６は、液穴１７の側の外側湾曲部１８と中栓９の開口１１の側の内側湾曲部１９とが非対称な形状をなし、外側湾曲部１８が内側湾曲部１９の曲率半径よりも大きい曲率半径を有する形状に形成できた。このため、応答性とシール性がともに向上した。 In this embodiment, PE (polyethylene) is used as the material of the valve member 10, and a softening agent is added to the ultra-low density PE to adjust the hardness to about A75 on the shore. Therefore, even if the valve body 13 and the air valve portion 15 of the valve member 10 are formed into a thin film of 0.2 mm, the shape can be maintained. As a result, in the seal portion 16, the outer curved portion 18 on the side of the liquid hole 17 and the inner curved portion 19 on the side of the opening 11 of the inner plug 9 have an asymmetrical shape, and the outer curved portion 18 is the inner curved portion 19. It was possible to form a shape having a radius of curvature larger than the radius of curvature. Therefore, both responsiveness and sealing property are improved.

また、液穴１７を弁体１３と弁体支持部１４の肩部とにわたって大きく開口させ、肩部の肉厚を薄くしても型崩れを起こすことがないので、液穴１７の拡張により液出し性が向上した。この結果、内容物の少量出しから大量出しまでの全域において圧搾力を低減することができ、液穴１７からの吐出量が増加したことで大量出しもスムーズに行うことができ、特に、内容器３の残量が少なくなった状態で行う最終排液も、軽い力で出し切ることが可能となった。 Further, even if the liquid hole 17 is widely opened between the valve body 13 and the shoulder portion of the valve body support portion 14 and the wall thickness of the shoulder portion is thinned, the shape is not lost. Therefore, the liquid can be expanded by expanding the liquid hole 17. The ease of delivery has improved. As a result, the squeezing force can be reduced in the entire range from the small amount to the large amount of the contents, and the large amount can be smoothly discharged due to the increase in the discharge amount from the liquid hole 17, and in particular, the inner container. The final drainage performed when the remaining amount of 3 is low can be discharged with a light force.

以下、上記の構成における作用について説明する。内容器３の内容物を吐出する際には、外容器２に圧搾力を加え、この圧搾力を外容器２と内容器３の間の空気層を介して内容器３に与えて内容器３を搾る。 Hereinafter, the operation in the above configuration will be described. When the contents of the inner container 3 are discharged, a squeezing force is applied to the outer container 2 and this squeezing force is applied to the inner container 3 through the air layer between the outer container 2 and the inner container 3. Squeeze.

内容器３の内圧の高まりにより弁体１３は、図１０（ａ）に示す閉弁状態から図１０（ｂ）に示す中間状態へ遷移して、中栓９の開口１１から離間する方向に移動する。本実施の形態では、駆動圧力に対する弁体１３の応答性が優れているので、この過程の途中でシール部１６が弁座１２から離間し始める。さらに、弁体１３は、図１０（ｂ）に示す中間状態から図１０（ｃ）に示す閉弁状態に遷移し、弁体１３の移動に伴ってシール部１６が弁座１２から離間して開弁位置に移動し、内容器３の内容物がシール部１６と弁座１２の間を通り、キャップ４の吐出口７から押し出される。 Due to the increase in the internal pressure of the inner container 3, the valve body 13 transitions from the valve closed state shown in FIG. 10 (a) to the intermediate state shown in FIG. 10 (b) and moves in a direction away from the opening 11 of the inner plug 9. To do. In the present embodiment, the responsiveness of the valve body 13 to the driving pressure is excellent, so that the seal portion 16 starts to separate from the valve seat 12 in the middle of this process. Further, the valve body 13 transitions from the intermediate state shown in FIG. 10 (b) to the valve closed state shown in FIG. 10 (c), and the seal portion 16 is separated from the valve seat 12 as the valve body 13 moves. It moves to the valve opening position, the contents of the inner container 3 pass between the seal portion 16 and the valve seat 12, and are pushed out from the discharge port 7 of the cap 4.

このとき、本実施の形態では、シール部１６が曲がり剛性の大きい内側湾曲部１９と曲がり剛性の小さい外側湾曲部１８が共存する構造を有しているので、曲がり剛性の小さい外側湾曲部１８により、弁体１３の移動に追従してシール部１６が容易に稼働する優れた応答性を実現できる。 At this time, in the present embodiment, since the seal portion 16 has a structure in which the inner curved portion 19 having a large bending rigidity and the outer curved portion 18 having a small bending rigidity coexist, the outer curved portion 18 having a small bending rigidity is used. , It is possible to realize excellent responsiveness in which the seal portion 16 easily operates following the movement of the valve body 13.

外容器２に加える圧搾力を解除すると、弾性変形した外容器２が復元力により元の形状に戻ることで外容器２の内部空間が広がって負圧となる。このため、図１に一点鎖線で示すように、空気弁部１５が開いて吸気口２３を通して外容器２と内容器３の間に空気が流入する。 When the squeezing force applied to the outer container 2 is released, the elastically deformed outer container 2 returns to its original shape due to the restoring force, and the internal space of the outer container 2 expands to become a negative pressure. Therefore, as shown by the alternate long and short dash line in FIG. 1, the air valve portion 15 opens and air flows in between the outer container 2 and the inner container 3 through the intake port 23.

また、弁体１３は、自身の復元力で閉弁方向に移動するとともに、加圧力が解除された内容器３の内部が負圧となることで、容器内外の圧力差を駆動圧として、中栓９の開口１１に接近する方向に押圧される。弁体１３の移動に伴ってシール部１６が弁座１２に当接する閉弁位置に移動し、シール面２０と弁座面２１の間を封止する。 Further, the valve body 13 moves in the valve closing direction by its own restoring force, and the inside of the inner container 3 from which the pressing force is released becomes a negative pressure, so that the pressure difference between the inside and outside of the container is used as the driving pressure. It is pressed in a direction approaching the opening 11 of the stopper 9. As the valve body 13 moves, the seal portion 16 moves to a valve closing position where it abuts on the valve seat 12, and seals between the seal surface 20 and the valve seat surface 21.

このとき、本実施の形態では、シール部１６が曲がり剛性の大きい内側湾曲部１９と曲がり剛性の小さい外側湾曲部１８が共存する構造を有するので、曲がり剛性の大きい内側湾曲部１９により、駆動圧を受ける弁体１３からシール部１６に加わる力を確実にシール面２０に作用させて弁座面２１とシール面２０との間に内容物の漏出を防止する封止に必要な十分な面圧を確保できる。 At this time, in the present embodiment, since the seal portion 16 has a structure in which the inner curved portion 19 having a large bending rigidity and the outer curved portion 18 having a small bending rigidity coexist, the driving pressure is generated by the inner curved portion 19 having a large bending rigidity. Sufficient surface pressure required for sealing to prevent leakage of contents between the valve seat surface 21 and the seal surface 20 by reliably applying a force applied to the seal portion 16 from the valve body 13 to be received to the seal surface 20. Can be secured.

また、図１１に示すように、シール面２０が弁座面２１に圧接する閉弁状態で、シール部１６の内周の内側シール面２０ａと中栓９の弁座面２１との間、およびシール部１６の外周の外側シール面２０ｂと中栓９の弁座面２１との間に毛管現象により内容物の液層２４が形成される。 Further, as shown in FIG. 11, in a closed state where the seal surface 20 is in pressure contact with the valve seat surface 21, between the inner seal surface 20a on the inner circumference of the seal portion 16 and the valve seat surface 21 of the inner plug 9. A liquid layer 24 of the contents is formed between the outer sealing surface 20b on the outer periphery of the sealing portion 16 and the valve seat surface 21 of the inner plug 9 by a capillary phenomenon.

この際に、外側湾曲部１８の曲率半径が内側湾曲部１９の曲率半径よりも大きいことで、シール面２０と弁座面２１の間の非圧接領域において、外側湾曲部１８の外側シール面２０ｂと弁座面２１の間に形成する外側液封用間隙２５は、内側湾曲部１９の内側シール面２０ａと弁座面２１の間に形成する内側液封用間隙２６よりも狭くなり、表面張力が強まることで、毛管現象により保持する液層２４を確実に保持できる。このため、内容物の酸化を防止するために必要なシール部１６と弁座１２の間の通気の遮断を確実に実現できる。
（実施例２）
図１２、図１３は、本発明の他の実施の形態を示すものである。先の実施の形態で説明したものと同様の作用を行う部材には同符号を付して説明を省略する。 At this time, since the radius of curvature of the outer curved portion 18 is larger than the radius of curvature of the inner curved portion 19, the outer sealing surface 20b of the outer curved portion 18 is formed in the non-pressure contact region between the sealing surface 20 and the valve seat surface 21. The outer liquid sealing gap 25 formed between the valve seat surface 21 and the inner liquid sealing gap 25 formed between the inner sealing surface 20a of the inner curved portion 19 and the valve seat surface 21 is narrower than the inner liquid sealing gap 26 formed between the valve seat surface 21 and the surface tension. By strengthening, the liquid layer 24 held by the capillary phenomenon can be reliably held. Therefore, it is possible to reliably block the ventilation between the seal portion 16 and the valve seat 12, which is necessary for preventing the contents from being oxidized.
(Example 2)
12 and 13 show other embodiments of the present invention. Members that perform the same operations as those described in the previous embodiment are designated by the same reference numerals, and the description thereof will be omitted.

中栓９は、弁座面２１の開口１１に臨む側に、弁座面２１の内側縁に沿って環状に***する***部２７を有しており、***部２７はシール部１６の内側湾曲部１９より内側の開口１１の側に位置している。***部２７は開口１１の半径方向で外側に位置する外側面が弁座面２１の一部をなして曲面状に窪む形状をなす。 The inner plug 9 has a raised portion 27 that is annularly raised along the inner edge of the valve seat surface 21 on the side of the valve seat surface 21 facing the opening 11, and the raised portion 27 is curved inward of the seal portion 16. It is located on the side of the opening 11 inside the portion 19. The raised portion 27 has a shape in which the outer surface located on the outer side in the radial direction of the opening 11 forms a part of the valve seat surface 21 and is recessed in a curved surface shape.

このため、弁座面２１は、シール部１６が当接する平面状弁座面２１ａと、平面状弁座面２１ａから立ち上がり、シール部１６の内側シール面２０ａに対向する曲面状弁座面２１ｂからなり、曲面状弁座面２１ｂは、***部２７の外側面からなる。 Therefore, the valve seat surface 21 rises from the flat valve seat surface 21a with which the seal portion 16 abuts and the curved valve seat surface 21b that rises from the flat valve seat surface 21a and faces the inner seal surface 20a of the seal portion 16. The curved valve seat surface 21b is formed of the outer surface of the raised portion 27.

逆止弁８は、閉弁状態でシール部１６のシール面２０の一部、すなわち頂点付近が平面状弁座面２１ａと曲面状弁座面２１ｂにわたって圧接する。 When the check valve 8 is closed, a part of the seal surface 20 of the seal portion 16, that is, the vicinity of the apex is pressed against the flat valve seat surface 21a and the curved valve seat surface 21b.

シール面２０と弁座面２１が離間する非圧接領域において、外側湾曲部１８の外側シール面２０ｂと平面状弁座面２１ａの間に外側液封用間隙２５を形成し、内側湾曲部１９の内側シール面２０ａと曲面状弁座面２１ｂの間に内側液封用間隙２６を形成しており、内側液封用間隙２６が外側液封用間隙２５よりも狭く形成されている。 In the non-pressure contact region where the seal surface 20 and the valve seat surface 21 are separated from each other, an outer liquid sealing gap 25 is formed between the outer seal surface 20b of the outer curved portion 18 and the flat valve seat surface 21a, and the inner curved portion 19 is formed. An inner liquid sealing gap 26 is formed between the inner sealing surface 20a and the curved valve seat surface 21b, and the inner liquid sealing gap 26 is formed narrower than the outer liquid sealing gap 25.

内側シール面２０ａと曲面状弁座面２１ｂの間に形成する内側液封用間隙２６は、内側シール面２０ａと曲面状弁座面２１ｂに沿って湾曲し、上方に向けて開口している。 The inner liquid sealing gap 26 formed between the inner sealing surface 20a and the curved valve seat surface 21b is curved along the inner sealing surface 20a and the curved valve seat surface 21b and opens upward.

そして、閉弁位置にある弁体１３は、シール部１６のシール面２０が弁座１２の弁座面２１に圧接する圧接領域と、シール部１６のシール面２０と弁座１２の弁座面２１が離間ｓする非圧接領域を形成し、圧接領域と非圧接領域との境の近傍において、内側シール面２０ａに対する接線と曲面状弁座面２１ｂに対する接線との成す角度θ_３が、外側シール面２０ｂに対する接線と平面状弁座面２１ａとの成す角度θ_４よりも小さくなる。 The valve body 13 in the valve closed position has a pressure contact region in which the seal surface 20 of the seal portion 16 is in pressure contact with the valve seat surface 21 of the valve seat 12, and the seal surface 20 of the seal portion 16 and the valve seat surface of the valve seat 12. 21 forms a non-pressure contact region separated by s, and in the vicinity of the boundary between the pressure contact region and the non-pressure contact region, the angle θ ₃ formed by the tangent line to the inner seal surface 20a and the tangent line to the curved valve seat surface 21b is the outer seal. It is smaller than the angle θ ₄ formed by the tangent to the surface 20b and the flat valve seat surface 21a.

この構成によれば、弁体１３は、閉弁状態において、容器内外の圧力差を駆動圧として、中栓９の開口１１に接近する方向に押圧され、シール部１６が弁座面２１の平面状弁座面と曲面状弁座面にわたって圧接し、シール面２０と弁座面２１の間を封止する。 According to this configuration, in the valve closed state, the valve body 13 is pressed in a direction approaching the opening 11 of the inner plug 9 by using the pressure difference between the inside and outside of the container as a driving pressure, and the seal portion 16 is a flat surface of the valve seat surface 21. Pressure contact is performed over the curved valve seat surface and the curved valve seat surface to seal between the seal surface 20 and the valve seat surface 21.

このとき、本実施の形態では、シール部１６が曲がり剛性の大きい内側湾曲部１９と曲がり剛性の小さい外側湾曲部１８が共存する構造を有し、駆動圧を受ける弁体１３からシール部１６に加わる力を、曲がり剛性の大きい内側湾曲部１９により確実にシール面２０に作用させることに加えて以下の作用が生じる。 At this time, in the present embodiment, the seal portion 16 has a structure in which the inner curved portion 19 having a large bending rigidity and the outer curved portion 18 having a small bending rigidity coexist, and the valve body 13 receiving the driving pressure is transferred to the seal portion 16. In addition to ensuring that the applied force acts on the sealing surface 20 by the inner curved portion 19 having a large bending rigidity, the following action occurs.

すなわち、中栓９の弁座面２１が平面状弁座面２１ａと曲面状弁座面２１ｂからなり、シール部１６の内側湾曲部１９が平面状弁座面２１ａと曲面状弁座面２１ｂにわたって圧接するので、駆動圧を受ける弁体１３からシール部１６の内側湾曲部１９に加わる力が方向を違えて平面状弁座面２１ａと曲面状弁座面２１ｂに向けて作用し、シール部１６のシール面２０を平面状弁座面２１ａと曲面状弁座面２１ｂに確実に圧接させて、弁座面２１とシール面２０との間に内容物の漏出を防止する封止に必要な十分な面圧を確保できる。 That is, the valve seat surface 21 of the inner plug 9 is composed of a flat valve seat surface 21a and a curved valve seat surface 21b, and the inner curved portion 19 of the seal portion 16 extends over the flat valve seat surface 21a and the curved valve seat surface 21b. Since pressure contact is performed, a force applied from the valve body 13 that receives the driving pressure to the inner curved portion 19 of the seal portion 16 acts in different directions toward the flat valve seat surface 21a and the curved valve seat surface 21b, and the seal portion 16 Sufficiently necessary for sealing to prevent leakage of contents between the valve seat surface 21 and the seal surface 20 by securely pressing the seal surface 20 of the above against the flat valve seat surface 21a and the curved valve seat surface 21b. Surface pressure can be secured.

この際に、シール面２０と弁座面２１の間の非圧接領域において、内側湾曲部１９の内側シール面２０ａと曲面状弁座面２１ｂの間に形成する内側液封用間隙２６が、外側湾曲部１８の外側シール面２０ｂと平面状弁座面２１ａの間に形成する外側液封用間隙２５よりも狭くなり、表面張力が強まることで、毛管現象により保持する液層２４を確実に保持できる。 At this time, in the non-pressure contact region between the seal surface 20 and the valve seat surface 21, the inner liquid sealing gap 26 formed between the inner seal surface 20a of the inner curved portion 19 and the curved valve seat surface 21b is outside. It is narrower than the outer liquid sealing gap 25 formed between the outer sealing surface 20b of the curved portion 18 and the flat valve seat surface 21a, and the surface tension is increased, so that the liquid layer 24 held by the capillary phenomenon is reliably held. it can.

さらに、内側湾曲部１９の内側シール面２０ａと曲面状弁座面２１ｂの間に形成する内側液封用間隙２６が上方に向けて開口するので、毛管現象により保持する液層が振動等よって漏出することがなくなり、液層をより確実に保持できる。このため、内容物の酸化を防止するために必要なシール部１６と弁座１２の間の通気の遮断をより確実に実現できる。 Further, since the inner liquid sealing gap 26 formed between the inner sealing surface 20a of the inner curved portion 19 and the curved valve seat surface 21b opens upward, the liquid layer held by the capillary phenomenon leaks due to vibration or the like. The liquid layer can be held more reliably. Therefore, it is possible to more reliably block the ventilation between the seal portion 16 and the valve seat 12, which is necessary to prevent the contents from being oxidized.

４キャップ
５キャップ本体
７吐出口
８逆止弁
９中栓
１０弁部材
１１開口
１２弁座
１３弁体
１４弁体支持部
１５空気弁部
１６シール部
１７液穴
１８外側湾曲部
１９内側湾曲部
２０シール面
２０ａ内側シール面
２０ｂ外側シール面
２１弁座面
２１ａ平面状弁座面
２１ｂ曲面状弁座面
２４液層
２５外側液封用間隙
２６内側液封用間隙
２７ ***部 4 Cap 5 Cap body 7 Discharge port 8 Check valve 9 Inner plug 10 Valve member 11 Opening 12 Valve seat 13 Valve body 14 Valve body support part 15 Air valve part 16 Seal part 17 Liquid hole 18 Outer curved part 19 Inner curved part 20 Sealing surface 20a Inner sealing surface 20b Outer sealing surface 21 Valve seating surface 21a Flat valve seating surface 21b Curved valve seating surface 24 Liquid layer 25 Outer liquid sealing gap 26 Inner liquid sealing gap 27 Raised part

Claims

容器の口部に装着し、内部に逆止弁を有するキャップであり、
逆止弁は、容器の口部を塞ぐ位置に配置し、容器内の内容物が流れ出る開口および開口の周囲に形成した弁座を有する中栓と、中栓の開口および弁座を覆って配置する弁部材を備え、
弁部材は、中栓の開口および弁座に対向して配置し、中栓の開口の軸心方向において開弁位置と閉弁位置とにわたって変位する弁体と、弁体と一体をなし弁体の外周縁を支持して中栓に装着する弁体支持部を有し、
弁体は、中栓の開口を囲み弁体の外周縁に沿って環状に形成したシール部と、中栓の開口の半径方向においてシール部よりも外側の位置に形成した液穴を有し、
シール部は、中栓の開口の軸心に沿った断面において、弁座に向けて突出する湾曲形状を有し、湾曲形状は、液穴側の外側湾曲部と中栓の開口側の内側湾曲部との形状が異なり、外側湾曲部は内側湾曲部の曲率半径よりも大きい曲率半径を有することを特徴とするキャップ。 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 opening of the inner plug and the valve seat, and the inner plug having the opening and the valve seat formed around the opening through which the contents in the container flow out. Equipped with a valve member to
The valve member is arranged so as to face the opening of the inner plug and the valve seat, and is integrated with the valve body and the valve body which is displaced between the valve opening position and the valve closing position in the axial direction of the opening of the inner plug. Has a valve body support part that supports the outer peripheral edge of the
The valve body has a seal portion formed in an annular shape along the outer peripheral edge of the valve body surrounding the opening of the inner plug, and a liquid hole formed at a position outside the seal portion in the radial direction of the opening of the inner plug.
The seal portion has a curved shape that protrudes toward the valve seat in a cross section along the axis of the opening of the inner plug, and the curved shape is an outer curved portion on the liquid hole side and an inner curved portion on the opening side of the inner plug. A cap characterized in that the shape is different from that of the portion, and the outer curved portion has a radius of curvature larger than the radius of curvature of the inner curved portion.

シール部は、内側湾曲部の曲率半径よりも大きい曲率半径を有する外側湾曲部が内側湾曲部の曲がり剛性より小さい曲がり剛性を有し、曲がり剛性が大きい内側湾曲部と曲がり剛性が小さい外側湾曲部との曲がり剛性が異なる二つの部位が共存する構造をなすことを特徴とする請求項１に記載のキャップ。 In the seal portion, the outer curved portion having a radius of curvature larger than the radius of curvature of the inner curved portion has a bending rigidity smaller than the bending rigidity of the inner curved portion, and the inner curved portion having a large bending rigidity and the outer curved portion having a small bending rigidity The cap according to claim 1, wherein the cap has a structure in which two parts having different bending rigidity from the above coexist.

シール部は、弁体の無負荷状態において、湾曲形状の頂点を境として液穴側が外側湾曲部をなし、中栓の開口側が内側湾曲部をなし、外側湾曲部と内側湾曲部が非対称な形状をなすことを特徴とする請求項１または２に記載のキャップ。 In the no-load state of the valve body, the seal portion has an outer curved portion on the liquid hole side with the apex of the curved shape as a boundary, an inner curved portion on the opening side of the inner plug, and an asymmetrical shape between the outer curved portion and the inner curved portion. The cap according to claim 1 or 2, wherein the cap is made of.

逆止弁は、シール部のシール面の一部が中栓の弁座の弁座面に圧接する閉弁状態で、シール面と弁座面の間の非圧接領域において、外側湾曲部の外側シール面と弁座面の間に外側液封用間隙を形成し、内側湾曲部の内側シール面と弁座面の間に内側液封用間隙を形成し、外側液封用間隙を内側液封用間隙よりも狭く形成することを特徴とする請求項１から３の何れか１項に記載のキャップ。 The check valve is in a closed state in which a part of the seal surface of the seal portion is pressed against the valve seat surface of the valve seat of the inner plug, and is outside the outer curved portion in the non-pressure contact region between the seal surface and the valve seat surface. An outer liquid sealing gap is formed between the sealing surface and the valve seat surface, an inner liquid sealing gap is formed between the inner sealing surface and the valve seat surface of the inner curved portion, and the outer liquid sealing gap is inner liquid sealed. The cap according to any one of claims 1 to 3, wherein the cap is formed narrower than the gap.

逆止弁は、シール部のシール面が弁座の弁座面に圧接する圧接領域と、シール面と弁座面が離間する非圧接領域を形成し、圧殺領域と非圧接領域との境の近傍において、外側シール面に対する接線と弁座面との成す角度θ_１が、内側シール面に対する接線と弁座面との成す角度θ_２よりも小さくなることを特徴とする請求項４に記載のキャップ。 The check valve forms a pressure contact region in which the seal surface of the seal portion is in pressure contact with the valve seat surface of the valve seat and a non-pressure contact region in which the seal surface and the valve seat surface are separated from each other, and is a boundary between the pressure pressing region and the non-pressure contact region. The fourth aspect of claim 4, wherein the angle θ ₁ formed by the tangent to the outer sealing surface and the valve seat surface is smaller than the angle θ ₂ formed by the tangent to the inner sealing surface and the valve seat surface in the vicinity. cap.

中栓の弁座の弁座面は、シール部に当接する平面状弁座面と、平面状弁座面から立ち上がり、シール部の内側湾曲部の内側シール面に対向する曲面状弁座面からなり、シール部が平面状弁座面と曲面状弁座面にわたって圧接することを特徴とする請求項１に記載のキャップ。 The valve seat surface of the valve seat of the inner plug is from a flat valve seat surface that abuts on the seal portion and a curved valve seat surface that rises from the flat valve seat surface and faces the inner seal surface of the inner curved portion of the seal portion. The cap according to claim 1, wherein the seal portion is pressed against the flat valve seat surface and the curved valve seat surface.

逆止弁は、シール部のシール面の一部が中栓の弁座の弁座面に圧接する閉弁状態で、シール面と弁座面の間の非圧接領域において、外側湾曲部の外側シール面と平面状弁座面の間に外側液封用間隙を形成し、内側湾曲部の内側シール面と曲面状弁座面の間に内側液封用間隙を形成し、内側液封用間隙を外側液封用間隙よりも狭く形成することを特徴とする請求項６に記載のキャップ。 The check valve is in a closed state in which a part of the seal surface of the seal portion is pressed against the valve seat surface of the valve seat of the inner plug, and is outside the outer curved portion in the non-pressure contact region between the seal surface and the valve seat surface. An outer liquid sealing gap is formed between the sealing surface and the flat valve seat surface, an inner liquid sealing gap is formed between the inner sealing surface of the inner curved portion and the curved valve seat surface, and an inner liquid sealing gap is formed. The cap according to claim 6, wherein the cap is formed to be narrower than the outer liquid sealing gap.

内側シール面と曲面状弁座面の間に形成する内側液封用間隙が上方に向けて開口することを特徴とする請求項７に記載のキャップ。 The cap according to claim 7, wherein an inner liquid sealing gap formed between the inner sealing surface and the curved valve seat surface opens upward.

逆止弁は、シール部のシール面が弁座の弁座面に圧接する圧接領域と、シール面と弁座面が離間する非圧接領域を形成し、圧殺領域と非圧接領域との境の近傍において、内側シール面に対する接線と曲面状弁座面に対する接線との成す角度θ_３が、外側シール面に対する接線と平面状弁座面との成す角度θ_４よりも小さくなることを特徴とする請求項７または８に記載のキャップ。 The check valve forms a pressure contact region in which the seal surface of the seal portion is in pressure contact with the valve seat surface of the valve seat and a non-pressure contact region in which the seal surface and the valve seat surface are separated from each other, and is a boundary between the pressure pressing region and the non-pressure contact region. In the vicinity, the angle θ ₃ formed by the tangent to the inner sealing surface and the tangent to the curved valve seat surface is smaller than the angle θ ₄ formed by the tangent to the outer sealing surface and the flat valve seat surface. The cap according to claim 7 or 8.