JP4142756B2 - Safety structure of piston type pressure reducing device with V packing - Google Patents
Safety structure of piston type pressure reducing device with V packing Download PDFInfo
- Publication number
- JP4142756B2 JP4142756B2 JP27668297A JP27668297A JP4142756B2 JP 4142756 B2 JP4142756 B2 JP 4142756B2 JP 27668297 A JP27668297 A JP 27668297A JP 27668297 A JP27668297 A JP 27668297A JP 4142756 B2 JP4142756 B2 JP 4142756B2
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- packing
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- pressure
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Description
【０００１】
【発明の属する技術分野】
本発明はＶパッキン付きピストン型減圧装置の安全構造に関する。
【０００２】
【従来の技術】
ピストンの外周にＶパッキンを嵌装し、シリンダーに横穴を貫設し、シリンダーの内壁面に拡径部や縦溝を設けてこの拡径部や縦溝を横穴でシリンダーの外部へ開放させ、又は単に縦溝だけを設け、ピストンが過剰（高）圧を受けてこのＶパッキンがこの横穴、拡径部、縦溝に移動したときにガスをシリンダー外部へ放出する安全構造が本件出願人により実用新案登録第２５４８７４３号の中で提示されている。
【０００３】
【発明が解決しようとする課題】
上記の構造の場合、ピストンの外周に嵌装されたＶパッキンの密封部には、この密封部の外側面、即ちＶ溝面と反対側の外側の面、をシリンダーの内周壁面に圧接させるように、常に内側から圧力がかかっているので、ピストンが移動してＶパッキンがガス放出口に到達すると、Ｖパッキンの密封部がピストンの半径方向外方へ押し出され、密封部がガス放出口を塞いでしまうことがある。こうなると異常に上昇した圧力のガスを放出できず、減圧装置の破壊を惹き起こしたりして甚だ危険となったり、パッキンが放出口に強く圧接することによりパッキンを損傷してしまう。
【０００４】
本発明は上昇したガスの圧力をＶパッキンの密封部の内側面、即ちＶ溝面と反対側の内側の面、に作用させるようにして放出口の閉塞をなくし、確実且つ迅速にガスを放出できる安全構造を提供することを意図する。
【０００５】
【課題を解決するための手段】
本発明にかかるＶパッキン付きピストン型減圧装置の安全構造はシリンダーの側壁の内周壁面に設けられた環状の凹溝にＶパッキンが装入される。そして、該シリンダーに摺嵌するピストンにその受圧端面と側面を連通させる放出路が設けられている。
【０００６】
該内周壁面に該Ｖパッキンの密封部と反対側で該凹溝と連続する環状の隙間部が形成され、該側壁には該隙間部に連通するように放出口が貫通して設けられている。
該ピストンの移動で該側面の該開口の面内に該Ｖパッキンの該内側面が相対した時点で圧力ガスを該凹溝、該隙間部及び該放出口を通して外部へ放出するようになっている。
【０００７】
該放出路の該側面の該開口の縁に面取り部が形成されていてもよい。
【０００８】
【発明の実施の形態】
以下に本発明実施の形態を図面を参照しつつ説明する。
１は本発明の安全構造を適用したガス供給器を示してある。２は圧力ガス容器の取付部、３は減圧部、４はガスの供給口である。このガス供給器１は圧力ガス容器を下端部の取付部２に取り付けると、穿針５によりこの容器の封板が開封され、一次側の圧力Ｐ1の高圧ガスを減圧部３により減圧して、二次側の圧力Ｐ2のガスを供給口４から供給する型式となっている。
【０００９】
減圧部３はシリンダー６、このシリンダー６に摺嵌するピストン７、このピストン７に背圧をかけるスプリング８、このスプリング８の他端を受けるスプリング受け９を備えている。このスプリング受け９はシリンダー６の一端外周に螺合するキャップ１０に螺合した調整ネジ１１によってその位置を移動し、これによりスプリング８の圧力を調整するようになっている。
【００１０】
シリンダー６の側壁３２の内周壁面１２に環状の凹溝１３が設けられ、この凹溝１３にＶパッキン１４が装入される。
【００１１】
ピストン７は、その受圧端面１５と側面１６にそれぞれ開口１７と１８を有して両面１５と１６を連通させる、ガスの放出路１９を備えている。図示のように受圧端面１５に環状の凹嵩２０がある場合、この凹嵩２０を放出路１９の一部として利用できる。そして、Ｖパッキン１４の密封部２１の内側面２２はピストン７の側面１６に圧接している。
【００１２】
一次側の圧力Ｐ1のガス洩れ等により二次側の圧力Ｐ2が上昇すると、ピストン７はスプリング８を撓ませて上方へ移動する。
【００１３】
図２に示すように、放出路１９の側面１６での開口１８がＶパッキン１４の密封部２１に到達すると直ちにガス圧がこのＶパッキン１４の内側面２２を押圧してこの内側面２２を側面１６から離し、ガスはピストン７とシリンダー６の隙間を通り、更にシリンダー６とキャップ１０や、キャップ１０と調整ネジ１１の隙間を通って外部へ放出される。
【００１４】
このように、Ｖパッキン１４の密封部２１はガス放出時にピストン７の側面１６から押し離されるので、ピストンにＶパッキンを配装する従来型のように密封部が放出路内に入り込んで放出路を塞いでしまうようなことがなく、圧力放出が確実に行われ、減圧装置１の破損を防ぐ。
【００１５】
放出路１９の加工はピストン７の外部から行えるので、加工や管理も容易となる。
【００１６】
内周壁面１２にＶパッキン１４の密封部２１と反対側で凹溝１３と連続する環状の隙間部３１が形成される。そして、シリンダー６の側壁３２には隙間部３１に連通するようにガスの放出口３３が貫通して設けられている。
そして、ピストン７の移動で側面１６の開口１８の面内にＶパッキン１４の内側面２２が相対した時点で圧力ガスを凹溝１３、隙間部２１及び放出口３３を通して外部へ放出するようになっている。
圧力の上昇したガスは開口１８の面内にＶパッキン１４の内側面２２が相対した時点で始まり、凹溝１３、隙間部３１から放出口３３を通ってシリンダー６の外部へ流出するので、構成部品間の隙間から放出する場合に較べ、時間当りの大量の排気量を確保できる。
【００１７】
放出路１９の側面１６の開口１８の縁に面取り部３４が形成されている。こうすると、ピストン７がガス放出のためスプリング８を撓ませて移動したり、ガス放出後にピストン７が原状に戻る際に開口１８の縁がＶパッキン１４の密封部２１と当接して密封部２１を損傷するのが、この面取り部３４により防がれる。
【００１８】
【発明の効果】
本発明のＶパッキン付きピストン型減圧装置の安全構造によると、シリンダの内周壁面にＶパッキンを配装し、ピストンにその受圧端面と側面を直通させる放出路を設けたので、二次圧が所定の値以上に高圧になった場合、ピストンが移動して放出路がＶパッキンの密封部に到達した時点で直ちにこの高圧ガスでＶパッキンの密封部をピストンの側面から押し離して流出することになり、ガス放出を確実且つ迅速に行え、圧力の上昇したガスは隙間部から放出口を通ってシリンダーの外部へ流出するので、時間当りの大量の排気量を確保できる。
【００１９】
請求項２によると、ピストンがガス放出のためスプリングを撓ませて移動したり、ガス放出後にピストンが原状に戻る際に開口の縁がＶパッキンの密封部と当接して密封部を損傷するのを、この面取り部により防ぐことができる。
【図面の簡単な説明】
【図１】 本発明にかかる安全構造の具体例を採用したＶパッキン付きピストン型減圧装置の切断側面図である。
【図２】 同安全構造の作用の詳細説明図である。
【符号の説明】
６ シリンダー
７ ピストン
１２ 内周壁面
１３ 凹溝
１４ Ｖパッキン
１５ 受圧端面
１６ 側面
１７ 開口
１８ 開口
１９ 放出路
２１ 密封部
３１ 隙間部
３２ 側壁
３３ 放出口
３４ 面取り部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a safety structure of a piston type pressure reducing device with a V packing.
[0002]
[Prior art]
V-packing is fitted on the outer periphery of the piston, a horizontal hole is penetrated through the cylinder, an enlarged diameter part and a vertical groove are provided on the inner wall surface of the cylinder, and the enlarged diameter part and the vertical groove are opened to the outside of the cylinder through the horizontal hole. Alternatively, the present applicant has provided a safety structure in which only a vertical groove is provided, and when the piston receives excessive (high) pressure and the V-packing moves to the horizontal hole, the enlarged diameter portion, or the vertical groove, gas is discharged to the outside of the cylinder. It is presented in Utility Model Registration No. 2554843.
[0003]
[Problems to be solved by the invention]
In the case of the above structure, the outer surface of the sealing portion, that is, the outer surface opposite to the V groove surface, is brought into pressure contact with the inner peripheral wall surface of the cylinder on the sealing portion of the V packing fitted on the outer periphery of the piston. In this way, since the pressure is always applied from the inside, when the piston moves and the V packing reaches the gas discharge port, the sealing portion of the V packing is pushed outward in the radial direction of the piston, and the sealing portion becomes the gas discharge port. May be blocked. If this happens, the gas with an abnormally increased pressure cannot be released, causing a serious danger by causing destruction of the decompression device, or the packing is damaged by being strongly pressed against the discharge port.
[0004]
The present invention applies the increased gas pressure to the inner surface of the sealing portion of the V-packing, that is, the inner surface opposite to the V-groove surface, thereby eliminating the blockage of the discharge port and releasing the gas reliably and quickly. It is intended to provide a possible safety structure.
[0005]
[Means for Solving the Problems]
In the safety structure of the piston type pressure reducing device with V packing according to the present invention, the V packing is inserted into an annular groove provided on the inner peripheral wall surface of the side wall of the cylinder. And the discharge path which makes the pressure-receiving end surface and a side surface connect is provided in the piston slidingly fitted by this cylinder.
[0006]
An annular gap is formed in the inner peripheral wall on the opposite side of the sealing portion of the V-packing and is continuous with the groove, and a discharge port is provided through the side wall so as to communicate with the gap. The
When the piston moves, the pressure gas is discharged to the outside through the concave groove, the gap portion, and the discharge port when the inner surface of the V-packing faces the surface of the opening of the side surface. .
[0007]
A chamfer may be formed at the edge of the opening on the side surface of the discharge path.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0009]
The decompression unit 3 includes a cylinder 6, a piston 7 slidably fitted to the cylinder 6, a spring 8 that applies back pressure to the piston 7, and a spring receiver 9 that receives the other end of the spring 8. The position of the spring receiver 9 is moved by an adjusting screw 11 screwed to a cap 10 screwed to the outer periphery of one end of the cylinder 6, thereby adjusting the pressure of the spring 8.
[0010]
An annular groove 13 is provided in the inner peripheral wall surface 12 of the side wall 32 of the cylinder 6, and the V packing 14 is inserted into the groove 13.
[0011]
The piston 7 is provided with a gas discharge passage 19 having openings 17 and 18 on the pressure receiving end surface 15 and side surface 16 and communicating the both surfaces 15 and 16 with each other. As shown in the figure, when the pressure receiving end surface 15 has an annular concave bulk 20, the concave bulk 20 can be used as a part of the discharge path 19. The inner side surface 22 of the sealing portion 21 of the V packing 14 is in pressure contact with the side surface 16 of the piston 7.
[0012]
When the secondary pressure P 2 rises due to gas leakage of the primary pressure P 1 or the like, the piston 7 deflects the spring 8 and moves upward.
[0013]
As shown in FIG. 2, as soon as the opening 18 in the side surface 16 of the discharge path 19 reaches the sealing portion 21 of the V packing 14, the gas pressure presses the inner side surface 22 of the V packing 14, thereby 16, the gas passes through the gap between the piston 7 and the cylinder 6, and is further discharged to the outside through the gap between the cylinder 6 and the cap 10 and between the cap 10 and the adjusting screw 11.
[0014]
Thus, since the sealing part 21 of the V packing 14 is pushed away from the side surface 16 of the piston 7 at the time of gas discharge, the sealing part enters into the discharge path as in the conventional type in which the V packing is arranged on the piston. The pressure release is performed reliably and the
[0015]
Since processing of the discharge path 19 can be performed from the outside of the piston 7, processing and management are also facilitated.
[0016]
An annular gap 31 that is continuous with the groove 13 is formed on the inner peripheral wall surface 12 on the side opposite to the sealing portion 21 of the V packing 14. A gas discharge port 33 is provided through the side wall 32 of the cylinder 6 so as to communicate with the gap 31.
Then, when the inner surface 22 of the V packing 14 faces the opening 18 of the side surface 16 by the movement of the piston 7, the pressure gas is discharged to the outside through the concave groove 13, the gap portion 21 and the discharge port 33. ing.
Increased gas pressure begins when the inner surface 22 of the V-packing 14 in the plane of the opening 18 are relatively recessed groove 13, so through the discharge port 33 through the gap 31 flows out to the outside of the cylinder 6, configuration Compared to the case of discharging from the gap between parts, a large amount of exhaust per hour can be secured .
[0017]
A chamfer 34 is formed at the edge of the opening 18 on the side surface 16 of the discharge path 19. In this way, the piston 7 moves by deflecting the spring 8 for gas release, or when the piston 7 returns to its original shape after gas release, the edge of the opening 18 comes into contact with the sealing portion 21 of the V-packing 14 and the sealing portion 21. The chamfered portion 34 prevents the damage.
[0018]
【The invention's effect】
According to the safety structure of the piston type pressure reducing device with V packing according to the present invention, the V packing is arranged on the inner peripheral wall surface of the cylinder, and the discharge path for directly passing the pressure receiving end surface and the side surface is provided in the piston. When the pressure becomes higher than a predetermined value, the high pressure gas immediately pushes the sealing part of the V packing away from the side surface of the piston when the piston moves and the discharge path reaches the sealing part of the V packing. Therefore, the gas can be discharged reliably and quickly , and the gas whose pressure has increased flows out of the cylinder through the discharge port from the gap, so that a large amount of exhaust per hour can be secured.
[00 19 ]
According to the second aspect of the present invention, when the piston is moved by bending the spring for releasing gas, or when the piston returns to its original shape after releasing gas, the edge of the opening contacts the sealing portion of the V-packing and damages the sealing portion. Can be prevented by the chamfered portion.
[Brief description of the drawings]
FIG. 1 is a cut-away side view of a piston-type pressure reducing device with a V packing that employs a specific example of a safety structure according to the present invention.
FIG. 2 is a detailed explanatory view of the operation of the safety structure.
[Explanation of symbols]
6 Cylinder 7 Piston 12 Inner peripheral wall surface 13 Concave groove 14 V packing 15 Pressure receiving end surface 16 Side surface 17 Opening 18 Opening 19 Release passage 21 Sealing portion 31 Gap portion 32 Side wall 33 Release port 34 Chamfering portion
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27668297A JP4142756B2 (en) | 1997-09-25 | 1997-09-25 | Safety structure of piston type pressure reducing device with V packing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27668297A JP4142756B2 (en) | 1997-09-25 | 1997-09-25 | Safety structure of piston type pressure reducing device with V packing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1194199A JPH1194199A (en) | 1999-04-09 |
| JP4142756B2 true JP4142756B2 (en) | 2008-09-03 |
Family
ID=17572860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27668297A Expired - Fee Related JP4142756B2 (en) | 1997-09-25 | 1997-09-25 | Safety structure of piston type pressure reducing device with V packing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4142756B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101485280B1 (en) * | 2011-02-09 | 2015-01-21 | 에미텍 게젤샤프트 퓌어 에미시온스테크놀로기 엠베하 | Conveying Unit for Conveying Reducing Agent |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4540995B2 (en) * | 2004-01-22 | 2010-09-08 | 株式会社旭製作所 | Pressure reducing valve with safety device |
| JP6448127B2 (en) * | 2014-12-19 | 2019-01-09 | 日酸Ｔａｎａｋａ株式会社 | Safety valve mechanism, pressure regulator |
| CN113915526B (en) * | 2021-10-26 | 2023-09-05 | 宁波纽必得自动化科技有限公司 | High temperature high pressure cylinder seals and uses subassembly |
-
1997
- 1997-09-25 JP JP27668297A patent/JP4142756B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101485280B1 (en) * | 2011-02-09 | 2015-01-21 | 에미텍 게젤샤프트 퓌어 에미시온스테크놀로기 엠베하 | Conveying Unit for Conveying Reducing Agent |
| US9169760B2 (en) | 2011-02-09 | 2015-10-27 | Emitec Gesellschaft Fuer Emissionstechnologie Mbh | Conveying unit for conveying reducing agent |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1194199A (en) | 1999-04-09 |
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