JP3560102B2 - Piston with check valve - Google Patents

Piston with check valve Download PDF

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Publication number
JP3560102B2
JP3560102B2 JP18425696A JP18425696A JP3560102B2 JP 3560102 B2 JP3560102 B2 JP 3560102B2 JP 18425696 A JP18425696 A JP 18425696A JP 18425696 A JP18425696 A JP 18425696A JP 3560102 B2 JP3560102 B2 JP 3560102B2
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JP
Japan
Prior art keywords
valve
piston
valve seat
inclination angle
check valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP18425696A
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Japanese (ja)
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JPH109151A (en
Inventor
倫明 田辺
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nok Corp
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Nok Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Priority to JP18425696A priority Critical patent/JP3560102B2/en
Publication of JPH109151A publication Critical patent/JPH109151A/en
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Publication of JP3560102B2 publication Critical patent/JP3560102B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Description

【0001】
【発明の属する技術分野】
本発明は、ピストンの内部に流体の流路と、この流路を開閉する逆止弁とを備えた逆止弁付ピストンに関する。
【0002】
【従来の技術】
従来から、図3に示すように、ボール状の弁体bを弁座cに着座させて流体をシールする逆止弁aを備えた逆止弁付ピストンが知られており、このピストンにおいては、弁座cの傾斜角度θが加工の容易さから一定(一重)に設定されている。
【0003】
最近、使用流体の種類が増えて来たのに伴って、防食等の観点から、ピストンおよび弁体bの材質を金属から樹脂へ変更するものが出てきた。樹脂製のメリットとしては耐薬品性能や防錆性能に優れている点があるが、反対にデメリットとして弁体bの重量が軽くなり、同体積の金属製のものと比較して弁閉時の弁開放圧力(弁を開けるのに必要な力)が低下し、シール性が低下する問題がある。
【0004】
【発明が解決しようとする課題】
本発明は以上の点に鑑み、弁開放圧力が低下するのを防止し、もって優れたシール性を発揮することが可能な逆止弁付ピストンを提供することを目的とする。
【0005】
【課題を解決するための手段】
上記目的を達成するため、本発明の請求項1による逆止弁付ピストンは、ボール状の弁体を弁座に着座させて流体をシールする逆止弁を備えたピストンにおいて、前記弁座の傾斜角度を、前記弁体と前記弁座の接触線を境として弁入口側の傾斜角度が弁出口側の傾斜角度より大きくなるように、二重に設定することにした。
【0006】
また本発明の請求項2による逆止弁付ピストンは、請求項1の逆止弁付ピストンにおいて、弁座の表面に静電気を帯びさせることにした。
【0007】
【作用】
上記した従来技術の欠点である弁開放圧力の低下を防止するには、ボール状の弁体と弁座の接触面積を減少させて面圧を大きくするのが有効であり、方法としては、弁座の傾斜角度を大きくすれば、ピストンの軸方向の力が大きくなるが、流体の流れに伴う弁体の動きによる弁体の座りの良さは反対に弁座の傾斜角度が小さい方が良く、適正値は40〜50度であって、弁座の傾斜角度を大きくするのには限界がある。そこで本発明では、以下のような対処方法を提案する。
【0008】
【発明の実施の形態】
すなわち、弁座の傾斜角度を弁体と弁座の接触線を境として二重に設定し、弁入口側の傾斜角度を例えば上記したように40〜50度の範囲に設定するとともに弁出口側の傾斜角度をこれより小さくする。すると、弁体に対する弁座の接触部に環状突起状の段が形成されて弁体と弁座の接触面積が実質的に減少し、これに伴って面圧が大きくなる。尚、弁体と弁座斜面の接触面積は具体的には、各材料の弾性によって相対に大小する。
【0009】
また弁出口側の傾斜角度を弁入口側の傾斜角度より小さくしたのには、もう一つ以下のような理由がある。
【0010】
すなわち、弁入口側の傾斜角度は、面圧を大きくする目的に対しては大きい方が良いが、流体が弁体と弁座の接触部へ入り込む上での流体抵抗に対しては小さい方が良く、その分で面圧が低下するのを弁出口側の傾斜角度を小さくすることで補うことが可能となる。
【0011】
また請求項2のように、弁座の表面に静電気を帯びさせると、弁体の弁座への吸着力を増大させることが可能である。静電気は、加工時に弁座を摺動する工程を加えることにより容易に発生させることが可能である。
【0012】
【実施例】
つぎに本発明の実施例を図面にしたがって説明する。
【0013】
図1および図2に示すように、所定の形状を備えた樹脂製のピストン1の内部に流体の流路2が設けられており、この流路2の中途に、ボール状を呈する樹脂製の弁体4を弁座5に着座させて流体をシールする逆止弁3が設けられており、弁座5の傾斜角度が、弁体4と弁座5の接触線6を境として弁入口側(大径側)の傾斜角度θ が弁出口側(小径側)の傾斜角度θ より大きくなるように(θ >θ )、二重に設定されており、また弁座5の表面に静電気が帯電せしめられている。弁入口側の傾斜角度は40〜50度に設定されている。
【0014】
上記構成を備えた逆止弁付ピストンは、図上左側から流体圧力が作用すると弁体4が弁座5に着座して逆止弁3が閉じるとともに、反対に図上右側から流体圧力が作用すると弁体4が弁座5から離れて逆止弁3が開くもので、上記構成により以下の作用効果を奏する点に特徴を有している。
【0015】
すなわち、ボール状を呈する樹脂製の弁体4が着座する弁座5の傾斜角度が弁体4と弁座5の接触線6を境として二重に設定され、弁入口側の傾斜角度θ が40〜50度に設定されるとともに弁出口側の傾斜角度θ がこれより小さく設定されているために、弁体4に対する弁座5の接触部(上記した接触線6と同じところである)に環状突起状の段が形成されて弁体4と弁座5の接触面積が実質的に減少し、これに伴って面圧が大きくなる。したがって弁閉時の弁開放圧力が低下するのを防止し、または少なくとも低下率を軽減させることができ、これによりシール性を向上させることができる。
【0016】
また弁入口側の傾斜角度θ が40〜50度に設定されているために、流体の流れに伴う弁体4の動きによる弁体4の座りの良さをそのまま維持することができる。
【0017】
また弁座5の表面に静電気が帯電せしめられているために、弁体4の弁座5への吸着力を増大させることができ、これにより更に有効に弁開放圧力の低下を防止することができる。
【0018】
【発明の効果】
本発明は、以下の効果を奏する。
【0019】
すなわち、先ず、上記構成を備えた本発明の請求項1による逆止弁付ピストンにおいては、ボール状の弁体が着座する弁座の傾斜角度が弁体と弁座の接触線を境として二重に設定され、弁入口側の傾斜角度が弁出口側の傾斜角度より大きく設定されているために、弁体に対する弁座の接触部に環状突起状の段が形成されて弁体と弁座の接触面積が実質的に減少し、これに伴って面圧が大きくなる。したがって弁閉時の弁開放圧力が低下するのを防止し、または少なくとも低下率を軽減させることができ、これによりシール性を向上させることができる。
【0020】
またこれに加えて、上記構成を備えた本発明の請求項2による逆止弁付ピストンにおいては、弁座の表面に静電気を帯びさせたために、弁体の弁座への吸着力を増大させることができ、これにより更に有効に弁開放圧力の低下を防止することができる。
【図面の簡単な説明】
【図1】本発明の実施例に係る逆止弁付ピストンの断面図
【図2】同ピストンの要部拡大断面図
【図3】従来例に係る逆止弁付ピストンの要部断面図
【符号の説明】
1 ピストン
2 流路
3 逆止弁
4 弁体
5 弁座
6 接触線
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a check valve-equipped piston including a fluid flow path inside a piston and a check valve for opening and closing the flow path.
[0002]
[Prior art]
Conventionally, as shown in FIG. 3, a check valve-equipped piston having a check valve a for sealing a fluid by seating a ball-shaped valve body b on a valve seat c has been known. , The inclination angle θ of the valve seat c is set to be constant (single) for ease of machining.
[0003]
In recent years, as the types of fluids used have increased, there have been some types in which the material of the piston and the valve body b is changed from metal to resin from the viewpoint of corrosion protection and the like. As a merit of resin, there is a point that it has excellent chemical resistance performance and rust prevention performance. On the contrary, the weight of valve body b is lighter, and conversely, compared to a metal made of the same volume, the valve has better There is a problem that the valve opening pressure (the force required to open the valve) is reduced, and the sealing performance is reduced.
[0004]
[Problems to be solved by the invention]
In view of the above, an object of the present invention is to provide a piston with a check valve, which can prevent a valve opening pressure from lowering and thereby exhibit excellent sealing properties.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a piston with a check valve according to claim 1 of the present invention is a piston provided with a check valve for seating a ball-shaped valve body on a valve seat to seal fluid, The inclination angle is set to be double so that the inclination angle on the valve inlet side is larger than the inclination angle on the valve outlet side with respect to the contact line between the valve body and the valve seat.
[0006]
In the piston with a check valve according to the second aspect of the present invention, in the piston with the check valve according to the first aspect, the surface of the valve seat is charged with static electricity.
[0007]
[Action]
In order to prevent a decrease in the valve opening pressure, which is a drawback of the above-described conventional technology, it is effective to increase the surface pressure by reducing the contact area between the ball-shaped valve element and the valve seat. Increasing the inclination angle of the seat increases the axial force of the piston, but the better the seating of the valve body due to the movement of the valve body with the flow of fluid, the smaller the inclination angle of the valve seat is better, The appropriate value is 40 to 50 degrees, and there is a limit to increasing the inclination angle of the valve seat. Therefore, the present invention proposes the following coping method.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
That is, the inclination angle of the valve seat is set to be double with the contact line between the valve body and the valve seat as a boundary, and the inclination angle on the valve inlet side is set, for example, in the range of 40 to 50 degrees as described above, and the valve outlet side is set. Is made smaller than this. Then, a step of an annular projection is formed at the contact portion of the valve seat with the valve body, and the contact area between the valve body and the valve seat is substantially reduced, and the surface pressure increases accordingly. Specifically, the contact area between the valve body and the valve seat slope is relatively large or small due to the elasticity of each material.
[0009]
The reason why the inclination angle on the valve outlet side is made smaller than the inclination angle on the valve inlet side is also as follows.
[0010]
That is, the inclination angle on the valve inlet side is preferably large for the purpose of increasing the surface pressure, but smaller for the fluid resistance when the fluid enters the contact portion between the valve element and the valve seat. The decrease in the surface pressure can be compensated for by reducing the inclination angle on the valve outlet side.
[0011]
Further, when the surface of the valve seat is charged with static electricity as in claim 2, it is possible to increase the attraction force of the valve body to the valve seat. Static electricity can be easily generated by adding a step of sliding a valve seat during processing.
[0012]
【Example】
Next, embodiments of the present invention will be described with reference to the drawings.
[0013]
As shown in FIGS. 1 and 2, a fluid flow path 2 is provided inside a resin-made piston 1 having a predetermined shape, and a ball-shaped resin-made resin is provided in the middle of the flow path 2. A check valve 3 that seals fluid by seating the valve body 4 on a valve seat 5 is provided, and the inclination angle of the valve seat 5 is set at a valve inlet side with respect to a contact line 6 between the valve body 4 and the valve seat 5. (Θ 1 > θ 2 ) so that the inclination angle θ 1 on the (large diameter side) is larger than the inclination angle θ 2 on the valve outlet side (small diameter side). Is charged with static electricity. The inclination angle on the valve inlet side is set to 40 to 50 degrees.
[0014]
In the piston with a check valve having the above configuration, when fluid pressure acts from the left side in the figure, the valve body 4 sits on the valve seat 5 to close the check valve 3, and on the contrary, fluid pressure acts from the right side in the figure. Then, the valve element 4 is separated from the valve seat 5 and the check valve 3 is opened, and the above-described configuration is characterized in that the following operation and effect are achieved.
[0015]
That is, the inclination angle of the valve seat 5 on which the ball-shaped resin valve body 4 is seated is set to be double with the contact line 6 between the valve body 4 and the valve seat 5 as a boundary, and the inclination angle θ 1 on the valve inlet side. There because the inclination angle theta 2 of the valve outlet side while being set to 40 to 50 degrees is set to be smaller than this, (at the same place as the contact line 6 mentioned above) the contact portion of the valve seat 5 against the valve element 4 The contact area between the valve body 4 and the valve seat 5 is substantially reduced, and the surface pressure increases accordingly. Therefore, it is possible to prevent the valve opening pressure at the time of closing the valve from decreasing, or at least to reduce the decreasing rate, thereby improving the sealing performance.
[0016]
Also be inclined angle theta 1 of the valve inlet side because it is set to 40 to 50 degrees, to maintain the good sitting the valve body 4 by movement of the valve body 4 with the flow of the fluid.
[0017]
In addition, since the surface of the valve seat 5 is charged with static electricity, the attraction force of the valve body 4 to the valve seat 5 can be increased, thereby preventing the reduction of the valve opening pressure more effectively. it can.
[0018]
【The invention's effect】
The present invention has the following effects.
[0019]
That is, in the piston with a check valve according to the first aspect of the present invention having the above-described configuration, the inclination angle of the valve seat on which the ball-shaped valve element is seated is two times with the contact line between the valve element and the valve seat as a boundary. And the inclination angle on the valve inlet side is set to be larger than the inclination angle on the valve outlet side, so that an annular projecting step is formed at the contact portion of the valve seat with respect to the valve body, and the valve body and the valve seat are formed. Is substantially reduced, and the surface pressure increases accordingly. Therefore, it is possible to prevent the valve opening pressure at the time of closing the valve from decreasing, or at least to reduce the decreasing rate, thereby improving the sealing performance.
[0020]
In addition to this, in the piston with a check valve according to the second aspect of the present invention having the above configuration, the surface of the valve seat is charged with static electricity, so that the attraction force of the valve body to the valve seat is increased. Accordingly, it is possible to more effectively prevent a decrease in the valve opening pressure.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a piston with a check valve according to an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of a main part of the piston. FIG. Explanation of reference numerals]
DESCRIPTION OF SYMBOLS 1 Piston 2 Flow path 3 Check valve 4 Valve element 5 Valve seat 6 Contact line

Claims (2)

ボール状の弁体(4)を弁座(5)に着座させて流体をシールする逆止弁(3)を備えたピストン(1)において、
前記弁座(5)の傾斜角度を、前記弁体(4)と前記弁座(5)の接触線(6)を境として弁入口側の傾斜角度(θ )が弁出口側の傾斜角度(θ )より大きくなるように、二重に設定したことを特徴とする逆止弁付ピストン。
In a piston (1) provided with a check valve (3) for sealing a fluid by seating a ball-shaped valve body (4) on a valve seat (5),
The inclination angle of the valve seat (5) is defined by the inclination angle (θ 1 ) on the valve inlet side with respect to the contact line (6) between the valve body (4) and the valve seat (5). A piston with a check valve, characterized in that the piston is doubled so as to be larger than (θ 2 ).
請求項1の逆止弁付ピストン(1)において、
弁座(5)の表面に静電気を帯びさせたことを特徴とする逆止弁付ピストン。
The piston (1) with a check valve according to claim 1,
A piston with a check valve, wherein the surface of the valve seat (5) is charged with static electricity.
JP18425696A 1996-06-26 1996-06-26 Piston with check valve Expired - Fee Related JP3560102B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18425696A JP3560102B2 (en) 1996-06-26 1996-06-26 Piston with check valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18425696A JP3560102B2 (en) 1996-06-26 1996-06-26 Piston with check valve

Publications (2)

Publication Number Publication Date
JPH109151A JPH109151A (en) 1998-01-13
JP3560102B2 true JP3560102B2 (en) 2004-09-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
JP18425696A Expired - Fee Related JP3560102B2 (en) 1996-06-26 1996-06-26 Piston with check valve

Country Status (1)

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US20080145250A1 (en) * 2006-12-14 2008-06-19 Emerson Electric Co. Oiler pump
FR2912798B1 (en) * 2007-02-21 2012-12-21 De Dietrich DRAIN ASSEMBLY WITH OPENING UP AND FLAT SEAT WITHOUT RETENTION AREAS FOR A CHEMICAL REACTOR.
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JP4831049B2 (en) * 2007-10-23 2011-12-07 株式会社島津製作所 Check valve, liquid feeding device using the same, and method of manufacturing the check valve
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JP2017064591A (en) * 2015-09-29 2017-04-06 株式会社丸一 Sealing structure of atomization mechanism
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