JP2014015983A - Seal structure of high-pressure gas container - Google Patents

Seal structure of high-pressure gas container Download PDF

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JP2014015983A
JP2014015983A JP2012153838A JP2012153838A JP2014015983A JP 2014015983 A JP2014015983 A JP 2014015983A JP 2012153838 A JP2012153838 A JP 2012153838A JP 2012153838 A JP2012153838 A JP 2012153838A JP 2014015983 A JP2014015983 A JP 2014015983A
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truncated cone
ring
seal structure
nozzle
gas container
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JP2012153838A
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JP5973816B2 (en
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Hironobu Kinoshita
弘信 木之下
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Benkan Kikoh Corp
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Nippon Steel and Sumikin Kikoh Co Ltd
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Priority to KR1020120090078A priority patent/KR20140007240A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J12/00—Pressure vessels in general
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/08—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with exclusively metal packing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/06—Closures, e.g. cap, breakable member
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/32—Hydrogen storage

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Joints With Pressure Members (AREA)
  • Gasket Seals (AREA)
  • Pressure Vessels And Lids Thereof (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a seal structure capable of surely preventing leakage of filled gas from a gap between a nozzle part of a high-pressure gas container and an accessory such as a connection pipe connected to the nozzle part.SOLUTION: The seal structure includes: a metal block 20 comprising a first truncated conical part 22, a column part 21 and a second truncated conical part 23 and having a through hole 24 on an axial center; and first and second rubber O-rings 25, 26 mounted around the column part 21 near the first truncated conical part 22 and near the second truncated conical part 23 respectively. A first recess 30 comprising an area of a tapered surface 31 and an area of a cylindrical surface 32 is formed on a nozzle part 4, a second recess 40 comprising an area of a tapered surface 41 and an area of a cylindrical surface 42 is formed on a connection pipe 5, the block 20 is stored in the first and second recesses 30, 40, the connection pipe 5 is pressed to the nozzle part 4, respective outer peripheral surfaces of the first and second truncated conical parts 22, 23 are brought into pressure-contact with the tapered surfaces 31, 41, and the respective first and second O-rings 25, 26 are brought into contact with the cylindrical surfaces 32, 42.

Description

本発明は、高圧ガス容器の口に該当する管台部と、これに連設される接続管や止栓といった付属品と、の間を密閉し、充填ガスの漏出を防止する高圧ガス容器のシール構造に関する。   The present invention provides a high-pressure gas container that seals between a nozzle section corresponding to the mouth of a high-pressure gas container and accessories such as a connecting pipe and a stopcock that are connected to the nozzle, thereby preventing leakage of a filling gas. The present invention relates to a seal structure.

高圧ガス容器は、水素（Ｈ2）や酸素（Ｏ2）や窒素（Ｎ2）などのガス（液化ガスを含む）を高圧状態で貯蔵するのに用いられる。一般に、高圧ガス容器は、円筒状の胴部、この胴部の両端にそれぞれ形成された鏡板部、およびこれらの鏡板部の一方または両方から突き出す管台部から構成される。管台部は高圧ガス容器の口に該当し、高圧ガス容器の内部空間は管台部を通じて外部に開口する。 The high-pressure gas container is used to store gas (including liquefied gas) such as hydrogen (H 2 ), oxygen (O 2 ), and nitrogen (N 2 ) in a high-pressure state. In general, a high-pressure gas container includes a cylindrical barrel portion, end plate portions formed at both ends of the barrel portion, and a nozzle portion protruding from one or both of the end plate portions. The nozzle part corresponds to the mouth of the high-pressure gas container, and the internal space of the high-pressure gas container opens to the outside through the nozzle part.

管台部が鏡板部の両方に設けられた高圧ガス容器の場合、一方の管台部には、ガスを充填したり放出したりするために、付属品として配管の取付けが可能な接続管が連設され、他方の管台部には、その開口を閉塞するために、付属品として止栓が連設される。管台部が鏡板部の一方のみに設けられた高圧ガス容器の場合は、その管台部に接続管が連設される。このように、高圧ガス容器は、管台部に付属品が連設されることから、管台部と付属品との間から充填ガスが漏出するのを防止するシール構造が不可欠である（例えば、特許文献１参照）。   In the case of a high-pressure gas container in which the nozzle part is provided on both of the end plate parts, one of the nozzle parts is provided with a connecting pipe to which piping can be attached as an accessory in order to fill and discharge gas. In order to close the opening, the stopper is continuously provided as an accessory in the other nozzle part. In the case of a high-pressure gas container in which the nozzle part is provided only on one of the end plate parts, a connecting pipe is connected to the nozzle part. As described above, since the accessory for the high-pressure gas container is connected to the nozzle part, a sealing structure that prevents the filling gas from leaking between the nozzle part and the accessory is indispensable (for example, , See Patent Document 1).

図１は、従来の一般的なシール構造を示す模式図であり、同図（ａ）は各部材を分解した状態の断面図を示し、同図（ｂ）は各部材を組み付けた状態の断面図を示す。同図では、高圧ガス容器１は、胴部２の端に形成された鏡板部３から管台部４が突き出しており、この管台部４に付属品として接続管５が連設されるものを例示している。また、管台部４への接続管５の固定は袋ナット６を用いるものを例示している。   FIG. 1 is a schematic view showing a conventional general seal structure, in which FIG. 1 (a) shows a sectional view of each member disassembled, and FIG. 1 (b) shows a section of each member assembled. The figure is shown. In the figure, the high-pressure gas container 1 has a nozzle part 4 protruding from an end plate part 3 formed at the end of the body part 2, and a connecting pipe 5 is connected to the nozzle part 4 as an accessory. Is illustrated. Further, the connection pipe 5 is fixed to the nozzle base 4 by using a cap nut 6 as an example.

図１に示すように、従来のシール構造では、管台部４の先端面４ａと対向する接続管５の端面５ａに環状溝５ｂが形成されており、この環状溝５ｂに金属製のＯリング１１が挿入される。この金属Ｏリング１１は、金属細管をリング状に成形し、その端面同士を溶接した後、表面研磨し、必要に応じて表面にコーティングやメッキを施した中空の金属ガスケットである。   As shown in FIG. 1, in the conventional seal structure, an annular groove 5b is formed in the end surface 5a of the connecting pipe 5 facing the tip surface 4a of the nozzle base part 4, and a metal O-ring is formed in the annular groove 5b. 11 is inserted. The metal O-ring 11 is a hollow metal gasket in which a metal thin tube is formed into a ring shape, end surfaces thereof are welded, and then the surface is polished, and the surface is coated or plated as necessary.

組み付けに際し、金属Ｏリング１１を端面５ａに備えた接続管５は、高圧ガス容器１の管台部４の先端に隣接して配置され、袋ナット６が被せられる。そして、管台部４の外周面に形成された雄ねじ４ｂに袋ナット６を螺合させ、袋ナット６が管台部４に締め付けられることにより、接続管５は金属Ｏリング１１を介在した状態で管台部４に向けて軸方向に押し付けられる。これにより、金属Ｏリング１１は弾性変形し、管台部４の先端面４ａに圧接するとともに、接続管５の環状溝５ｂに圧接した状態にされる。   At the time of assembly, the connection pipe 5 provided with the metal O-ring 11 on the end face 5a is disposed adjacent to the tip of the nozzle base part 4 of the high-pressure gas container 1 and covered with the cap nut 6. Then, the cap nut 6 is screwed into the male screw 4 b formed on the outer peripheral surface of the nozzle pedestal 4, and the cap nut 6 is fastened to the nozzle pedestal 4, so that the connection pipe 5 has the metal O-ring 11 interposed therebetween. Then, it is pressed in the axial direction toward the nozzle part 4. As a result, the metal O-ring 11 is elastically deformed and is brought into pressure contact with the distal end surface 4 a of the nozzle pedestal portion 4 and is in pressure contact with the annular groove 5 b of the connection pipe 5.

このように、従来のシール構造では、金属Ｏリング１１がシール部材として機能し、金属Ｏリング１１と管台部４および接続管５との弾性接触により気密性が保たれ、管台部４と接続管５との間からの充填ガスの漏出が防止される。   Thus, in the conventional seal structure, the metal O-ring 11 functions as a seal member, and the hermeticity is maintained by elastic contact between the metal O-ring 11 and the nozzle 4 and the connecting pipe 5. Leakage of the filling gas from the connection pipe 5 is prevented.

なお、袋ナット６には、管台部４の先端面４ａと接続管５の端面５ａとの隙間につながるリークポート６ａが穿設されている。このリークポート６ａは、充填ガスの漏出の検知に用いられる。   The cap nut 6 is provided with a leak port 6a that leads to a gap between the tip surface 4a of the nozzle pedestal 4 and the end surface 5a of the connecting pipe 5. The leak port 6a is used for detecting leakage of the filling gas.

ところで、高圧ガス容器に充填されるガスの圧力仕様は、従来、一般的に１０〜２０ＭＰａ程度、高くても４０ＭＰａ程度に過ぎなかったが、近年では、それを遥かに超えて９０ＭＰａとされるものもあった。しかし、充填ガスの圧力が９０ＭＰａと高い場合、前記図１に示すような金属Ｏリング１１の弾性接触によるシール構造では、シール性能が不足し、充填ガスの漏出を抑えることができない。特に、水素やヘリウム（Ｈｅ）などように分子が小さくて透過性が高いガスを充填した場合は、なおさら充填ガスの漏出防止は困難である。   By the way, the pressure specification of the gas filled in the high-pressure gas container has been generally about 10 to 20 MPa, and at most only about 40 MPa, but in recent years, the pressure specification is much more than 90 MPa. There was also. However, when the pressure of the filling gas is as high as 90 MPa, the sealing structure based on the elastic contact of the metal O-ring 11 as shown in FIG. 1 has insufficient sealing performance and cannot suppress the leakage of the filling gas. In particular, when a gas having a small molecule and high permeability such as hydrogen or helium (He) is filled, it is difficult to prevent leakage of the filling gas.

このため、本出願人は、前記特許文献１に記載されるとおり、充填ガスの圧力が高い場合であってもシール性能を確保できる特殊なシール構造を提案した。   For this reason, the present applicant has proposed a special seal structure that can ensure the sealing performance even when the pressure of the filling gas is high, as described in Patent Document 1.

図２は、特許文献１に記載される特殊なシール構造を示す模式図であり、同図（ａ）は各部材を分解した状態の断面図を示し、同図（ｂ）は各部材を組み付けた状態の断面図を示し、同図（ｃ）は同図（ａ）の要部拡大図を示す。同図では、前記図１と共通するものには同一の符号を付しており、高圧ガス容器１の管台部４に付属品として接続管５が連設され、管台部４への接続管５の固定は袋ナット６を用いるものを例示している。   FIG. 2 is a schematic view showing a special seal structure described in Patent Document 1. FIG. 2 (a) shows a sectional view of each member in an exploded state, and FIG. 2 (b) shows the assembly of each member. FIG. 2C is an enlarged view of the main part of FIG. In the figure, the same reference numerals are attached to the same components as in FIG. 1, and a connecting pipe 5 is connected as an accessory to the nozzle part 4 of the high-pressure gas container 1, and the connection to the nozzle part 4 is performed. The fixing of the pipe 5 is exemplified by using a cap nut 6.

図２に示すシール構造では、前記図１に示す金属Ｏリング１１に代え、管台部４と接続管５との間に金属製のブロック２０が介在している。具体的には、その金属ブロック２０は、円柱部２１、この円柱部２１の一端からテーパー状に連なる第１円錐台部２２、および円柱部２１の他端からテーパー状に連なる第２円錐台部２３からなり、軸心に沿って貫通孔２４を有する。また、管台部４、接続管５には、金属ブロック２０を受け入れるために、それぞれ第１凹部３０、第２凹部４０が形成されている。   In the seal structure shown in FIG. 2, a metal block 20 is interposed between the nozzle 4 and the connecting pipe 5 in place of the metal O-ring 11 shown in FIG. 1. Specifically, the metal block 20 includes a cylindrical portion 21, a first truncated cone portion 22 that tapers from one end of the cylindrical portion 21, and a second truncated cone portion that tapers from the other end of the cylindrical portion 21. 23 and has a through hole 24 along the axis. Moreover, in order to receive the metal block 20, the 1st recessed part 30 and the 2nd recessed part 40 are formed in the nozzle part 4 and the connecting pipe 5, respectively.

管台部４に形成された第１凹部３０は、金属ブロック２０の第１円錐台部２２の全体を収容するとともに、円柱部２１の第１円錐台部２２側のほぼ半分を収容する。この第１凹部３０はテーパー面３１の領域を有し、この領域のテーパー角度α２が金属ブロック２０の第１円錐台部２２のテーパー角度α１と一致している。一方、接続管５に形成された第２凹部４０は、金属ブロック２０の第２円錐台部２３の全体を収容するとともに、円柱部２１の第２円錐台部２３側のほぼ半分を収容する。この第２凹部４０はテーパー面４１の領域を有し、この領域のテーパー角度β２が金属ブロック２０の第２円錐台部２３のテーパー角度β１と一致している。   The first recess 30 formed in the nozzle part 4 accommodates the entire first truncated cone part 22 of the metal block 20 and accommodates almost half of the cylindrical part 21 on the first truncated cone part 22 side. The first recess 30 has an area of a tapered surface 31, and the taper angle α 2 of this area coincides with the taper angle α 1 of the first truncated cone part 22 of the metal block 20. On the other hand, the second recess 40 formed in the connecting pipe 5 accommodates the entire second truncated cone part 23 of the metal block 20 and accommodates almost half of the cylindrical part 21 on the second truncated cone part 23 side. The second recess 40 has a region of a tapered surface 41, and the taper angle β 2 of this region coincides with the taper angle β 1 of the second truncated cone part 23 of the metal block 20.

組み付けに際し、接続管５は、高圧ガス容器１の管台部４に先端に隣接して配置され、袋ナット６が被せられる。このとき、管台部４の第１凹部３０および接続管５の第２凹部４０には、金属ブロック２０が挿入された状態にある。そして、袋ナット６が管台部４に締め付けられることにより、接続管５は金属ブロック２０を介在した状態で管台部４に向けて軸方向に押し付けられる。これにより、金属ブロック２０は、第１円錐台部２２の外周面が第１凹部３０のテーパー面３１に圧接するとともに、第２円錐台部２３の外周面が第２凹部４０のテーパー面４１に圧接した状態にされる。   When assembling, the connecting pipe 5 is disposed adjacent to the tip of the nozzle 4 of the high-pressure gas container 1 and covered with a cap nut 6. At this time, the metal block 20 is inserted in the first recess 30 of the nozzle pedestal 4 and the second recess 40 of the connecting pipe 5. Then, when the cap nut 6 is fastened to the nozzle part 4, the connecting pipe 5 is pressed in the axial direction toward the nozzle part 4 with the metal block 20 interposed. As a result, the metal block 20 has the outer peripheral surface of the first truncated cone part 22 in pressure contact with the tapered surface 31 of the first recess 30, and the outer peripheral surface of the second truncated cone part 23 contacts the tapered surface 41 of the second recess 40. It is brought into a pressure contact state.

このように、図２に示すシール構造では、金属ブロック２０がシール部材として機能し、第１円錐台部２２の外周面と第１凹部３０のテーパー面３１とがテーパー形状でメタル面接触すると同時に、第２円錐台部２３の外周面と第２凹部４０のテーパー面４１とがテーパー形状でメタル面接触し、これらの接触面に押付け力集中させることにより、管台部４と接続管５との間の気密性が強力に保たれる。これにより、充填ガスの圧力が高い場合であっても、管台部４と接続管５との間からの充填ガスの漏出が防止される。   As described above, in the seal structure shown in FIG. 2, the metal block 20 functions as a seal member, and at the same time the outer peripheral surface of the first truncated cone portion 22 and the tapered surface 31 of the first recess 30 are tapered and contact the metal surface. The outer peripheral surface of the second truncated cone portion 23 and the tapered surface 41 of the second recess 40 are in a tapered shape and contact with the metal surface, and the pressing force is concentrated on these contact surfaces, whereby the nozzle portion 4 and the connecting pipe 5 are Airtightness between the two is kept strong. Thereby, even if the pressure of the filling gas is high, leakage of the filling gas from between the nozzle 4 and the connecting pipe 5 is prevented.

特開２０１１−１９６５１１号公報JP 2011-196511 A

高圧ガス容器に充填されるガスの圧力仕様は、近年、９０ＭＰａが最高となっていたところ、ここ最近では、それをさらに超える圧力仕様が要求されている。確かに、前記図２に示すような金属ブロックのメタル面接触によるシール構造によれば、前記特許文献１に記載されるように、充填ガスの圧力が９０ＭＰａまでの場合は、充填ガスの漏出を防止できることが実証されている。しかし、充填ガスの圧力が９０ＭＰａを超えた場合の検証はされていない。したがって、充填ガスの圧力仕様がますます増加する動向からして、高圧ガス容器のシール構造のさらなる改良と、その技術の確立が強く望まれている。   In recent years, the pressure specification of the gas filled in the high-pressure gas container has been 90 MPa, and recently, a pressure specification exceeding that is required. Certainly, according to the seal structure by the metal surface contact of the metal block as shown in FIG. 2, when the pressure of the filling gas is up to 90 MPa, the leakage of the filling gas is prevented as described in Patent Document 1. It has been demonstrated that it can be prevented. However, it has not been verified when the pressure of the filling gas exceeds 90 MPa. Therefore, with the trend of increasing the pressure specification of the filling gas, further improvement of the sealing structure of the high-pressure gas container and establishment of the technology are strongly desired.

本発明は、上記の実情に鑑みてなされたものであり、充填ガスの圧力が９０ＭＰａを超えて高い場合であっても、高圧ガス容器の管台部とこれに連設される接続管や止栓といった付属品との間から充填ガスが漏出するのを確実に防止できるシール構造を提供することを目的とする。   The present invention has been made in view of the above circumstances, and even when the pressure of the filling gas is higher than 90 MPa, the nozzle base portion of the high-pressure gas container and the connecting pipe or stop connected thereto are provided. It is an object of the present invention to provide a seal structure that can reliably prevent leakage of a filling gas from an accessory such as a stopper.

本発明者は、上記目的を達成するため、前記図２に示すような金属ブロックのメタル面接触によるシール構造を前提として改良を重ね、種々の試験を実施して鋭意検討を行った。その結果、前記図２に示すシール構造と同様の金属ブロックのメタル面接触に加え、金属ブロックの円柱部にゴム製のＯリングを環装させて、このＯリングの弾性接触を活用すれば、メタル面接触と弾性接触という二重のシールが形成されるので、シール性能が向上し、充填ガスの漏出を確実に防止できることを知見した。   In order to achieve the above-mentioned object, the present inventor has made extensive studies by carrying out various tests on the premise of the sealing structure by the metal surface contact of the metal block as shown in FIG. As a result, in addition to the metal surface contact of the metal block similar to the seal structure shown in FIG. 2, if a rubber O-ring is attached to the cylindrical portion of the metal block and the elastic contact of this O-ring is utilized, It has been found that since a double seal of metal surface contact and elastic contact is formed, the sealing performance is improved and leakage of the filling gas can be surely prevented.

本発明は、このような知見に基づいて完成されたものであり、その要旨は、下記の高圧ガス容器のシール構造にある。すなわち、本発明は、高圧ガス容器の管台部とこの管台部に連設される付属品との間のシール構造であって、
円柱部、この円柱部の一端からテーパー状に連なる第１円錐台部、および前記円柱部の他端からテーパー状に連なる第２円錐台部からなり、軸心に沿って貫通孔を有する金属製のブロックと、
前記円柱部の前記第１円錐台部寄りに環装されたゴム製の第１Ｏリングと、
前記円柱部の前記第２円錐台部寄りに環装されたゴム製の第２Ｏリングと、を備え、
前記管台部には、前記第１円錐台部の全体を収容するテーパー面の領域、および前記円柱部の前記第１Ｏリングが環装された部分を収容する円筒面の領域からなる第１凹部が形成され、
前記付属品には、前記第２円錐台部の全体を収容するテーパー面の領域、および前記円柱部の前記第２Ｏリングが環装された部分を収容する円筒面の領域からなる第２凹部が形成されており、
前記管台部の前記第１凹部および前記付属品の前記第２凹部に前記ブロックが収容され、前記付属品が前記管台部に向けて軸方向に押し付けられることにより、前記第１円錐台部の外周面が前記第１凹部の前記テーパー面に圧接するとともに、前記第２円錐台部の外周面が前記第２凹部の前記テーパー面に圧接し、さらに、前記第１Ｏリングが前記第１凹部の前記円筒面に接触するとともに、前記第２Ｏリングが前記第２凹部の前記円筒面に接触した状態にされていること、
を特徴とする高圧ガス容器のシール構造である。 The present invention has been completed on the basis of such findings, and the gist thereof lies in the following high-pressure gas container seal structure. That is, the present invention is a seal structure between the nozzle part of the high-pressure gas container and the accessory connected to the nozzle part,
A cylindrical part, a first truncated cone part that tapers from one end of the cylindrical part, and a second truncated cone part that tapers from the other end of the cylindrical part, and has a through hole along the axis. Block of
A first O-ring made of rubber and provided near the first truncated cone part of the cylindrical part;
A second O-ring made of rubber and provided near the second truncated cone part of the cylindrical part,
The tube base portion includes a first concave portion including a region of a tapered surface that accommodates the entire first truncated cone portion and a region of a cylindrical surface that accommodates a portion of the columnar portion where the first O-ring is mounted. Formed,
The accessory includes a second concave portion including a tapered surface region that accommodates the entire second truncated cone portion and a cylindrical surface region that accommodates a portion of the columnar portion where the second O-ring is mounted. Formed,
The block is accommodated in the first concave portion of the nozzle base portion and the second concave portion of the accessory, and the accessory is pressed in the axial direction toward the nozzle base portion, thereby the first truncated cone portion. And the outer peripheral surface of the second truncated cone part is in pressure contact with the tapered surface of the second recess, and the first O-ring is in contact with the first recess. The second O-ring is in contact with the cylindrical surface of the second recess,
This is a high-pressure gas container sealing structure.

上記のシール構造では、前記ブロックの材質が、極軟鋼、純鉄、銅、アルミニウム、チタンもしくはそれらの合金、またはステンレス鋼であることが好ましい。   In the above-described seal structure, it is preferable that the material of the block is extremely soft steel, pure iron, copper, aluminum, titanium or an alloy thereof, or stainless steel.

上記のシール構造では、前記第１Ｏリングおよび前記第２Ｏリングの材質が合成ゴムであることが好ましい。   In the above seal structure, it is preferable that the material of the first O-ring and the second O-ring is a synthetic rubber.

上記のシール構造において、前記円柱部には、前記第１Ｏリングの前記第２円錐台部側に隣接して前記第１Ｏリングよりも硬い樹脂製の第１バックアップリングが環装され、前記第２Ｏリングの前記第１円錐台部側に隣接して前記第２Ｏリングよりも硬い樹脂製の第２バックアップリングが環装されていることが好ましい。   In the above sealing structure, a first backup ring made of a resin harder than the first O-ring is provided around the cylindrical portion adjacent to the second truncated cone portion side of the first O-ring, and the second O-ring is mounted. It is preferable that a second back-up ring made of a resin harder than the second O-ring is provided adjacent to the first truncated cone part side of the ring.

また、上記のシール構造では、前記第１円錐台部および前記第２円錐台部それぞれの前記外周面、並びに前記第１凹部および前記第２凹部それぞれの前記テーパー面の表面粗さが算術平均粗さ（Ｒａ）で１．６μｍ以下であることが好ましい。   In the above seal structure, the surface roughness of the outer peripheral surface of each of the first truncated cone portion and the second truncated cone portion, and the tapered surface of each of the first recessed portion and the second recessed portion is an arithmetic average roughness. The thickness (Ra) is preferably 1.6 μm or less.

上記のシール構造においては、前記第１円錐台部および前記第２円錐台部それぞれのテーパー角度の加工公差を−２°／＋０°とし、前記第１凹部および前記第２凹部それぞれの前記テーパー面の領域のテーパー角度の加工公差を−０°／＋２°とすることが好ましい。   In the above sealing structure, the processing tolerance of the taper angle of each of the first truncated cone part and the second truncated cone part is set to −2 ° / + 0 °, and the tapered surface of each of the first recessed part and the second recessed part. It is preferable to set the processing tolerance of the taper angle in the region of −0 ° / + 2 °.

本発明のシール構造によれば、先ず金属ブロックがメタル面接触によるシール部材として機能し、これに加え、第１、第２Ｏリングが弾性接触によるさらなるシール部材として機能するため、シール性能が向上し、充填ガスの圧力が９０ＭＰａを超えて高い場合であっても、充填ガスの漏出を確実に防止することができる。   According to the seal structure of the present invention, first, the metal block functions as a seal member by metal surface contact, and in addition, the first and second O-rings function as further seal members by elastic contact, so that the seal performance is improved. Even when the pressure of the filling gas is higher than 90 MPa, leakage of the filling gas can be reliably prevented.

従来の一般的なシール構造を示す模式図であり、同図（ａ）は各部材を分解した状態の断面図を示し、同図（ｂ）は各部材を組み付けた状態の断面図を示す。It is a schematic diagram which shows the conventional general seal structure, The figure (a) shows sectional drawing of the state which decomposed | disassembled each member, The figure (b) shows sectional drawing of the state which assembled | attached each member. 特許文献１に記載される特殊なシール構造を示す模式図であり、同図（ａ）は各部材を分解した状態の断面図を示し、同図（ｂ）は各部材を組み付けた状態の断面図を示し、同図（ｃ）は同図（ａ）の要部拡大図を示す。It is a schematic diagram which shows the special seal structure described in patent document 1, The figure (a) shows sectional drawing of the state which decomposed | disassembled each member, The figure (b) is a cross section of the state which assembled | attached each member. The figure (c) shows the principal part enlarged view of the figure (a). 本発明の第１実施形態のシール構造を示す模式図であり、同図（ａ）は各部材を分解した状態の断面図を示し、同図（ｂ）は各部材を組み付けた状態の断面図を示し、同図（ｃ）は同図（ａ）の要部拡大図を示す。It is a schematic diagram which shows the seal structure of 1st Embodiment of this invention, The figure (a) shows sectional drawing of the state which decomposed | disassembled each member, The figure (b) is sectional drawing of the state which assembled | attached each member. The figure (c) shows the principal part enlarged view of the figure (a). 本発明の第２実施形態のシール構造を示す模式図であり、同図（ａ）は各部材を分解した状態の断面図を示し、同図（ｂ）は各部材を組み付けた状態の断面図を示す。It is a schematic diagram which shows the seal structure of 2nd Embodiment of this invention, The figure (a) shows sectional drawing of the state which decomposed | disassembled each member, The figure (b) is sectional drawing of the state which assembled | attached each member. Indicates. 本発明の第３実施形態のシール構造を示す模式図であり、同図（ａ）は各部材を分解した状態の断面図を示し、同図（ｂ）は各部材を組み付けた状態の断面図を示す。It is a schematic diagram which shows the seal structure of 3rd Embodiment of this invention, The figure (a) shows sectional drawing of the state which decomposed | disassembled each member, The figure (b) is sectional drawing of the state which assembled | attached each member. Indicates. 実施例の試験結果として充填ガスの圧力と漏出発生率の関係を示す図である。It is a figure which shows the relationship between the pressure of a filling gas, and the leak occurrence rate as a test result of an Example.

以下に、本発明の高圧ガス容器のシール構造について、その実施形態を詳述する。   Below, the embodiment is explained in full detail about the sealing structure of the high-pressure gas container of the present invention.

＜第１実施形態＞
図３は、本発明の第１実施形態のシール構造を示す模式図であり、同図（ａ）は各部材を分解した状態の断面図を示し、同図（ｂ）は各部材を組み付けた状態の断面図を示し、同図（ｃ）は同図（ａ）の要部拡大図を示す。同図に示す第１実施形態のシール構造は、前記図２に示すシール構造の構成を基本としており、前記図２と共通するものには同一の符号を付し、重複する説明は適宜省略する。 <First Embodiment>
FIG. 3 is a schematic view showing a seal structure according to the first embodiment of the present invention. FIG. 3 (a) shows a sectional view of each member in an exploded state, and FIG. 3 (b) shows that the members are assembled. The sectional view of a state is shown, and the figure (c) shows the principal part enlarged view of the figure (a). The seal structure of the first embodiment shown in the figure is based on the structure of the seal structure shown in FIG. 2, and the same reference numerals are given to the same elements as those in FIG. .

図３に示すように、第１実施形態のシール構造では、高圧ガス容器１の管台部４に付属品として接続管５が連設され、管台部４への接続管５の固定には袋ナット６が用いられる。管台部４と接続管５との間には、前記図２に示すシール構造と同様に、円柱部２１、第１円錐台部２２および第２円錐台部２３からなる金属ブロック２０が介在している。第１円錐台部２２は円柱部２１の一端からテーパー状に連なり、第２円錐台部２３は円柱部２１の他端からテーパー状に連なる。金属ブロック２０には、第１円錐台部２２、円柱部２１および第２円錐台部２３にわたり、軸心に沿って貫通孔２４が形成されている。   As shown in FIG. 3, in the seal structure of the first embodiment, a connecting pipe 5 is connected as an accessory to the nozzle 4 of the high-pressure gas container 1, and the connecting pipe 5 is fixed to the nozzle 4. A cap nut 6 is used. Similar to the seal structure shown in FIG. 2, a metal block 20 including a columnar part 21, a first truncated cone part 22, and a second truncated cone part 23 is interposed between the nozzle part 4 and the connecting pipe 5. ing. The first truncated cone part 22 is connected in a tapered manner from one end of the cylindrical part 21, and the second truncated cone part 23 is connected in a tapered form from the other end of the cylindrical part 21. A through hole 24 is formed in the metal block 20 along the axial center across the first truncated cone part 22, the cylindrical part 21 and the second truncated cone part 23.

金属ブロック２０の材質としては、極軟鋼、純鉄、銅、アルミニウム、チタンもしくはそれらの合金、またはステンレス鋼を採用することができる。   As the material of the metal block 20, it is possible to employ extremely soft steel, pure iron, copper, aluminum, titanium or their alloys, or stainless steel.

また、円柱部２１の外周面には、第１円錐台部２２寄りの位置に円周方向にわたり第１円周溝２１ａが形成され、第２円錐台部２３寄りの位置に円周方向にわたり第２円周溝２１ｂが形成されている。第１円周溝２１ａには、弾性変形が可能なゴム製の第１Ｏリング２５が嵌め込まれ、第２円周溝２１ｂには、同じく弾性変形が可能なゴム製の第２Ｏリング２６が嵌め込まれる。第１、第２Ｏリング２５、２６の材質としては、合成ゴムを採用することができ、一般的にはＮＢＲと称されるニトリルゴム等が用いられる。   Further, a first circumferential groove 21a is formed on the outer peripheral surface of the cylindrical portion 21 in a circumferential direction at a position near the first truncated cone portion 22, and a first circumferential groove is formed at a position near the second truncated cone portion 23. Two circumferential grooves 21b are formed. A first O-ring 25 made of rubber that can be elastically deformed is fitted into the first circumferential groove 21a, and a second O-ring 26 made of rubber that can also be elastically deformed is fitted into the second circumferential groove 21b. . Synthetic rubber can be adopted as the material of the first and second O-rings 25 and 26, and nitrile rubber or the like generally called NBR is used.

さらに、第１実施形態では、第１円周溝２１ａには、第１Ｏリング２５の第２円錐台部２３側（第１円錐台部２２側とは反対側）に隣接して、第１Ｏリング２５よりも硬い樹脂製の第１バックアップリング２７が嵌め込まれている。第２円周溝２１ｂには、第２Ｏリング２６の第１円錐台部２２側（第２円錐台部２３側とは反対側）に隣接して、第２Ｏリング２６よりも硬い樹脂製の第２バックアップリング２８が嵌め込まれている。第１、第２バックアップリング２７、２８は、それぞれ、第１、第２Ｏリング２５、２６の過剰な変形を抑え、第１、第２円周溝２１ａ、２１ｂから第１、第２Ｏリング２５、２６が脱落するのを防止する役割を担う。第１、第２バックアップリング２７、２８の材質としては、硬質のフッ素樹脂を採用することができ、一般的にはポリテトラフルオロエチレン（ＰＴＦＥ）等が用いられる。   Furthermore, in the first embodiment, the first circumferential groove 21 a is adjacent to the second truncated cone part 23 side (the opposite side to the first truncated cone part 22 side) of the first O ring 25, and the first O ring. A first backup ring 27 made of resin harder than 25 is fitted. The second circumferential groove 21b is adjacent to the first truncated cone part 22 side of the second O ring 26 (on the opposite side to the second truncated cone part 23 side) and is made of a resin made of a resin harder than the second O ring 26. 2 A backup ring 28 is fitted. The first and second backup rings 27 and 28 suppress excessive deformation of the first and second O-rings 25 and 26, respectively, and from the first and second circumferential grooves 21a and 21b to the first and second O-rings 25 and 25, respectively. It plays the role which prevents that 26 falls out. As the material of the first and second backup rings 27 and 28, hard fluororesin can be adopted, and generally polytetrafluoroethylene (PTFE) or the like is used.

このように、円柱部２１には、第１円錐台部２２寄りに第１Ｏリング２５および第１バックアップリング２７が環装され、第２円錐台部２３寄りに第２Ｏリング２６および第２バックアップリング２８が環装されている。   As described above, the cylindrical portion 21 is provided with the first O-ring 25 and the first backup ring 27 near the first truncated cone portion 22, and the second O-ring 26 and the second backup ring near the second truncated cone portion 23. 28 is ringed.

また、管台部４、接続管５には、そのような第１、第２Ｏリング２５、２６および第１、第２バックアップリング２７、２８を備えた金属ブロック２０を受け入れるために、それぞれ第１凹部３０、第２凹部４０が形成されている。   In addition, in order to receive the metal block 20 having the first and second O-rings 25 and 26 and the first and second backup rings 27 and 28 in the nozzle base part 4 and the connecting pipe 5, respectively, A recess 30 and a second recess 40 are formed.

管台部４に形成された第１凹部３０は、金属ブロック２０の第１円錐台部２２の全体を収容するテーパー面３１の領域、および円柱部２１の第１円錐台部２２側のほぼ半分を収容する円筒面３２の領域からなる。この第１凹部３０のテーパー面３１のテーパー角度α２は、金属ブロック２０の第１円錐台部２２のテーパー角度α１と一致している。円柱部２１の第１Ｏリング２５が環装された部分は、その第１凹部３０の円筒面３２の領域に収容される。   The first recess 30 formed in the tube base part 4 is an area of the tapered surface 31 that accommodates the entire first truncated cone part 22 of the metal block 20 and substantially half of the cylindrical part 21 on the first truncated cone part 22 side. It consists of the area | region of the cylindrical surface 32 which accommodates. The taper angle α <b> 2 of the tapered surface 31 of the first recess 30 matches the taper angle α <b> 1 of the first truncated cone part 22 of the metal block 20. The portion of the columnar portion 21 where the first O-ring 25 is mounted is accommodated in the region of the cylindrical surface 32 of the first recess 30.

一方、接続管５に形成された第２凹部４０は、金属ブロック２０の第２円錐台部２３の全体を収容するテーパー面４１の領域、および円柱部２１の第２円錐台部２３側のほぼ半分を収容する円筒面４２の領域からなる。この第２凹部４０のテーパー面４１のテーパー角度β２は、金属ブロック２０の第２円錐台部２３のテーパー角度β１と一致している。円柱部２１の第２Ｏリング２６が環装された部分は、その第２凹部４０の円筒面４２の領域に収容される。   On the other hand, the second concave portion 40 formed in the connecting pipe 5 is substantially the region of the tapered surface 41 that accommodates the entire second truncated cone portion 23 of the metal block 20 and the second truncated cone portion 23 side of the cylindrical portion 21. It consists of a region of a cylindrical surface 42 that accommodates half. The taper angle β2 of the taper surface 41 of the second recess 40 coincides with the taper angle β1 of the second truncated cone part 23 of the metal block 20. The portion of the cylindrical portion 21 where the second O-ring 26 is mounted is accommodated in the region of the cylindrical surface 42 of the second recess 40.

組み付けに際し、接続管５は、高圧ガス容器１の管台部４に先端に隣接して配置され、袋ナット６が被せられる。このとき、管台部４の第１凹部３０および接続管５の第２凹部４０には、第１、第２Ｏリング２５、２６および第１、第２バックアップリング２７、２８を備えた金属ブロック２０が挿入された状態にある。そして、袋ナット６が管台部４に締め付けられることにより、接続管５は金属ブロック２０を介在した状態で管台部４に向けて軸方向に押し付けられる。   When assembling, the connecting pipe 5 is disposed adjacent to the tip of the nozzle 4 of the high-pressure gas container 1 and covered with a cap nut 6. At this time, the metal block 20 provided with the first and second O-rings 25 and 26 and the first and second backup rings 27 and 28 in the first recess 30 of the nozzle 4 and the second recess 40 of the connecting pipe 5. Is in the inserted state. Then, when the cap nut 6 is fastened to the nozzle part 4, the connecting pipe 5 is pressed in the axial direction toward the nozzle part 4 with the metal block 20 interposed.

これにより、金属ブロック２０は、第１円錐台部２２の外周面が第１凹部３０のテーパー面３１に圧接するとともに、第２円錐台部２３の外周面が第２凹部４０のテーパー面４１に圧接した状態にされる。これと同時に、第１Ｏリング２５が弾性変形によって第１凹部３０の円筒面３２に接触するとともに、第２Ｏリング２６が弾性変形によって第２凹部４０の円筒面４２に接触した状態にされる。   As a result, the metal block 20 has the outer peripheral surface of the first truncated cone part 22 in pressure contact with the tapered surface 31 of the first recess 30, and the outer peripheral surface of the second truncated cone part 23 contacts the tapered surface 41 of the second recess 40. It is brought into a pressure contact state. At the same time, the first O-ring 25 comes into contact with the cylindrical surface 32 of the first recess 30 by elastic deformation, and the second O-ring 26 comes into contact with the cylindrical surface 42 of the second recess 40 by elastic deformation.

このような第１実施形態のシール構造によれば、先ず金属ブロック２０がシール部材として機能し、第１円錐台部２２の外周面と第１凹部３０のテーパー面３１とがテーパー形状でメタル面接触すると同時に、第２円錐台部２３の外周面と第２凹部４０のテーパー面４１とがテーパー形状でメタル面接触し、これらの接触面に押付け力集中させることにより、管台部４と接続管５との間の気密性が強力に保たれる。これに加え、第１、第２Ｏリング２５、２６がさらなるシール部材として機能し、第１Ｏリング２５と管台部４および金属ブロック２０との弾性接触、並びに第２Ｏリング２６と接続管５および金属ブロック２０との弾性接触により、上記のメタル面接触の下流側でも気密性が保たれる。このため、メタル面接触と弾性接触という二重のシールが形成されるので、シール性能が向上し、充填ガスの圧力が９０ＭＰａを超えて高い場合であっても、管台部４と接続管５との間からの充填ガスの漏出を確実に防止することができる。   According to such a seal structure of the first embodiment, first, the metal block 20 functions as a seal member, and the outer peripheral surface of the first truncated cone portion 22 and the tapered surface 31 of the first recess 30 are tapered and have a metal surface. Simultaneously with the contact, the outer peripheral surface of the second truncated cone part 23 and the tapered surface 41 of the second recess 40 are in a tapered shape and contact with the metal surface, and the pressing force is concentrated on these contact surfaces, thereby connecting to the nozzle part 4. The airtightness between the tube 5 is kept strong. In addition, the first and second O-rings 25 and 26 function as further sealing members, and elastic contact between the first O-ring 25 and the nozzle 4 and the metal block 20, and the second O-ring 26 and the connecting pipe 5 and metal. Due to the elastic contact with the block 20, airtightness is maintained even on the downstream side of the metal surface contact. For this reason, since a double seal of metal surface contact and elastic contact is formed, the sealing performance is improved, and even if the pressure of the filling gas exceeds 90 MPa, the nozzle 4 and the connecting pipe 5 Leakage of the filling gas from between the two can be reliably prevented.

高圧ガス容器１の材質は、特に限定はないが、耐圧強度および耐腐食性に優れたクロムモリブデン鋼（例：ＪＩＳ規格のＳＣＭ４３５）やニッケルクロムモリブデン鋼（例：ＪＩＳ規格のＳＮＣＭ４３９）などの低合金鋼を採用することができる。また、金属ブロック２０および接続管５の材質も、特に限定はないが、充填ガスとして水素を用いる場合、水素脆化による影響の小さいステンレス鋼（例：ＪＩＳ規格のＳＵＳ３１６Ｌ）を採用することができる。   The material of the high-pressure gas container 1 is not particularly limited, but is low such as chromium molybdenum steel (eg, JIS standard SCM435) and nickel chrome molybdenum steel (eg, JIS standard SNCM439) having excellent pressure resistance and corrosion resistance. Alloy steel can be adopted. Also, the material of the metal block 20 and the connecting pipe 5 is not particularly limited. However, when hydrogen is used as the filling gas, stainless steel (eg, JIS standard SUS316L) that is less affected by hydrogen embrittlement can be used. .

ここで、メタル面接触によって充填ガスの漏出を防止するには、接続管５を管台部４に向けて軸方向に押し付けることに伴いその軸方向の押付け力によって、第１、第２円錐台部２２、２３の外周面と第１、第２凹部３０、４０のテーパー面３１、４１との各接触面に直角に作用する面圧（以下、「面接触力」という）が、少なくとも充填ガスの圧力を超えている必要がある。接続管５の押付け力は袋ナット６の締付けトルクに依存することから、面接触力の調整は、袋ナット６の締付けトルクを調整することで行える。そして、金属ブロック２０の第１、第２円錐台部２２、２３それぞれのテーパー角度α１、β１（第１、第２凹部３０、４０それぞれのテーパー面３１、４１のテーパー角度α２、β２）は、高圧ガス容器１、金属ブロック２０および接続管５の材質に応じて適宜設定される。   Here, in order to prevent leakage of the filling gas by contact with the metal surface, the first and second truncated cones are caused by the axial pressing force as the connecting pipe 5 is pressed in the axial direction toward the nozzle 4. The surface pressure (hereinafter referred to as “surface contact force”) acting at right angles to the contact surfaces of the outer peripheral surfaces of the portions 22 and 23 and the tapered surfaces 31 and 41 of the first and second recesses 30 and 40 is at least filled gas. The pressure must be exceeded. Since the pressing force of the connecting pipe 5 depends on the tightening torque of the cap nut 6, the surface contact force can be adjusted by adjusting the tightening torque of the cap nut 6. The taper angles α1 and β1 of the first and second truncated cone portions 22 and 23 of the metal block 20 (taper angles α2 and β2 of the taper surfaces 31 and 41 of the first and second concave portions 30 and 40) are as follows: The pressure is appropriately set according to the materials of the high-pressure gas container 1, the metal block 20 and the connection pipe 5.

もっとも、高圧ガス容器１（管台部４）の材質と接続管５の材質が異なり、高圧ガス容器１の材料強度と接続管５の材料強度が相違する場合、材料強度の低い方が、歪み量が大きくなり、充填ガスの漏出が生じ易い。このため、材料強度の低い方の面接触力を補完すべく、材料強度の低い方のテーパー角度は材料強度の高い方のテーパー角度よりも大きくすることが望ましい。   However, when the material of the high-pressure gas container 1 (base 4) and the material of the connecting pipe 5 are different, and the material strength of the high-pressure gas container 1 and the material strength of the connecting pipe 5 are different, the lower the material strength, the more The amount increases and the filling gas is likely to leak. For this reason, in order to complement the surface contact force with the lower material strength, it is desirable that the taper angle with the lower material strength be larger than the taper angle with the higher material strength.

具体的には、管台部４の材料強度が接続管５の材料強度よりも高い場合、材料強度の高い側の第１円錐台部２２のテーパー角度α１および第１凹部３０のテーパー面３１の領域のテーパー角度α２を、材料強度の低い側の第２円錐台部２３のテーパー角度β１および第２凹部４０のテーパー面４１の領域のテーパー角度β２よりも小さくする。例えば、前者のテーパー角度を３０°とし、後者のテーパー角度を４５°とする。これとは逆に、管台部４の材料強度が接続管５の材料強度よりも低い場合、材料強度の低い側の第１円錐台部２２のテーパー角度α１および第１凹部３０のテーパー面３１の領域のテーパー角度α２を、材料強度の高い側の第２円錐台部２３のテーパー角度β１および第２凹部４０のテーパー面４１の領域のテーパー角度β２よりも大きくする。例えば、前者のテーパー角度を４５°とし、後者の角度をテーパー３０°とする。   Specifically, when the material strength of the tube base part 4 is higher than the material strength of the connection pipe 5, the taper angle α1 of the first truncated cone part 22 on the side with the higher material strength and the taper surface 31 of the first recess 30. The taper angle α2 of the region is set to be smaller than the taper angle β1 of the second truncated cone portion 23 on the low material strength side and the taper angle β2 of the region of the tapered surface 41 of the second recess 40. For example, the former taper angle is 30 ° and the latter taper angle is 45 °. On the contrary, when the material strength of the nozzle 4 is lower than the material strength of the connecting pipe 5, the taper angle α 1 of the first truncated cone 22 on the side having a lower material strength and the tapered surface 31 of the first recess 30. Is made larger than the taper angle β1 of the second truncated cone portion 23 on the side having a higher material strength and the taper angle β2 of the region of the tapered surface 41 of the second recess 40. For example, the former taper angle is 45 °, and the latter angle is 30 °.

また、第１、第２円錐台部２２、２３それぞれの外周面、および第１、第２凹部３０、４０それぞれのテーパー面３１、４１の表面粗さは、ＪＩＳ規格のＢ０６０１に準拠した算術平均粗さ（Ｒａ）で１．６μｍ以下であることが好ましい。より好ましくは、０．８μｍ以下である。上記の各面はメタル面接触の接触面であるため、その表面粗さが大き過ぎると充填ガスが透過して漏出してしまうからである。   The surface roughness of the outer peripheral surfaces of the first and second truncated cone portions 22 and 23 and the tapered surfaces 31 and 41 of the first and second recesses 30 and 40 are arithmetic averages based on JIS standard B0601. The roughness (Ra) is preferably 1.6 μm or less. More preferably, it is 0.8 μm or less. This is because each surface described above is a contact surface in contact with a metal surface, and if the surface roughness is too large, the filling gas permeates and leaks.

さらに、第１、第２円錐台部２２、２３それぞれのテーパー角度α１、β１の加工公差を−２°／＋０°とし、第１、第２凹部３０、４０それぞれのテーパー面３１、４１の領域のテーパー角度α２、β２の加工公差を−０°／＋２°とすることが好ましい。すなわち、組み付け前の状態で、第１円錐台部２２のテーパー角度α１は、第１凹部３０のテーパー面３１の領域のテーパー角度α２と同じにするか、それよりも小さくし、第２円錐台部２３のテーパー角度β１は、第２凹部４０のテーパー面４１の領域のテーパー角度β２と同じにするか、それよりも小さくしておく。第１、第２円錐台部２２、２３のテーパー角度α１、β１の方が大きいと、第１、第２円錐台部２２、２３が第１、第２凹部３０、４０の奥まで挿入されないため、第１、第２円錐台部２２、２３それぞれの外周面と、第１、第２凹部３０、４０それぞれのテーパー面３１、４１とのメタル面接触が不十分となるからである。   Further, the processing tolerances of the taper angles α1 and β1 of the first and second truncated cone parts 22 and 23 are set to −2 ° / + 0 °, respectively, and regions of the tapered surfaces 31 and 41 of the first and second recesses 30 and 40, respectively. The machining tolerances of the taper angles α2 and β2 are preferably set to −0 ° / + 2 °. That is, in the state before the assembly, the taper angle α1 of the first truncated cone part 22 is the same as or smaller than the taper angle α2 of the region of the tapered surface 31 of the first recess 30 to obtain the second truncated cone. The taper angle β1 of the portion 23 is the same as or smaller than the taper angle β2 of the region of the tapered surface 41 of the second recess 40. If the taper angles α1 and β1 of the first and second truncated cone parts 22 and 23 are larger, the first and second truncated cone parts 22 and 23 are not inserted to the back of the first and second recesses 30 and 40. This is because the metal surface contact between the outer peripheral surfaces of the first and second truncated cone portions 22 and 23 and the tapered surfaces 31 and 41 of the first and second recesses 30 and 40 becomes insufficient.

＜第２実施形態＞
図４は、本発明の第２実施形態のシール構造を示す模式図であり、同図（ａ）は各部材を分解した状態の断面図を示し、同図（ｂ）は各部材を組み付けた状態の断面図を示す。同図に示す第２実施形態のシール構造は、前記図３に示す第１実施形態のシール構造の構成を変形したものである。 Second Embodiment
FIG. 4 is a schematic view showing a seal structure according to a second embodiment of the present invention, where FIG. 4 (a) shows a sectional view of each member in an exploded state, and FIG. 4 (b) shows that the members are assembled. A sectional view of the state is shown. The seal structure of the second embodiment shown in the figure is a modification of the structure of the seal structure of the first embodiment shown in FIG.

図４に示すように、第２実施形態のシール構造では、高圧ガス容器１の管台部４に連設される付属品として、前記図３に示す接続管５に代え、止栓７を適用している。この止栓７に、前記第１実施形態と同様の第２凹部４０が形成されている。これにより、付属品として止栓７を用いる場合にも、管台部４と止栓７との間からの充填ガスの漏出を確実に防止することができる。なお、止栓７を用いる場合、金属ブロック２０には、第１円錐台部２２、円柱部２１および第２円錐台部２３にわたり、軸心に沿って貫通孔２４が形成されていなくても構わない。   As shown in FIG. 4, in the seal structure of the second embodiment, a stopcock 7 is applied as an accessory connected to the nozzle base part 4 of the high-pressure gas container 1 instead of the connecting pipe 5 shown in FIG. doing. A second recess 40 similar to that of the first embodiment is formed in the stopper plug 7. Thereby, also when using the stopper plug 7 as an accessory, leakage of the filling gas from between the nozzle part 4 and the stopper plug 7 can be reliably prevented. When the stopcock 7 is used, the metal block 20 may not have the through-hole 24 formed along the axis extending over the first truncated cone part 22, the columnar part 21, and the second truncated cone part 23. Absent.

＜第３実施形態＞
図５は、本発明の第３実施形態のシール構造を示す模式図であり、同図（ａ）は各部材を分解した状態の断面図を示し、同図（ｂ）は各部材を組み付けた状態の断面図を示す。同図に示す第３実施形態のシール構造は、前記図３に示す第１実施形態のシール構造の構成を変形したものである。 <Third Embodiment>
FIG. 5 is a schematic view showing a seal structure according to a third embodiment of the present invention. FIG. 5 (a) shows a sectional view of each member in an exploded state, and FIG. 5 (b) shows that the members are assembled. A sectional view of the state is shown. The seal structure of the third embodiment shown in the figure is a modification of the structure of the seal structure of the first embodiment shown in FIG.

図５に示すように、第３実施形態のシール構造では、管台部４に接続管５を固定するのに、前記図３に示す袋ナット６に代え、フランジ形式を適用している。すなわち、管台部４の雄ねじ４ｂにフランジ８を取り付け、接続管５に押さえ用フランジ９を取り付け、フランジ８と押さえ用フランジ９とをボルト１０によって締結する。このようにフランジ形式による場合でも、接続管５は金属ブロック２０を介在した状態で管台部４に向けて軸方向に押し付けられるので、前記第１実施形態と同様の効果を奏することができる。   As shown in FIG. 5, in the seal structure of the third embodiment, a flange type is applied instead of the cap nut 6 shown in FIG. 3 in order to fix the connection pipe 5 to the nozzle base part 4. That is, the flange 8 is attached to the male screw 4 b of the nozzle 4, the holding flange 9 is attached to the connecting pipe 5, and the flange 8 and the holding flange 9 are fastened by the bolt 10. As described above, even in the case of the flange type, the connection pipe 5 is pressed in the axial direction toward the nozzle pedestal portion 4 with the metal block 20 interposed therebetween, so that the same effect as in the first embodiment can be obtained.

もっとも、第３実施形態のシール構造でも、前記図３に示す接続管５に代え、前記第２実施形態と同様に止栓を用いても構わない。この場合、止栓に押さえ用フランジが取り付けられる。   However, in the seal structure of the third embodiment, a stopper may be used in the same manner as in the second embodiment, instead of the connecting pipe 5 shown in FIG. In this case, a pressing flange is attached to the stopper.

本発明のシール構造による効果を確認するため、下記の気密試験を実施した。   In order to confirm the effect of the seal structure of the present invention, the following airtight test was conducted.

［試験方法］
本発明例では、充填ガスとして透過性が高い水素ガスを用いる気密試験を行うこととした。このため、高圧ガス容器から管台部を切り出し、この管台部の先端に、前記図４（ｂ）に示すように止栓を袋ナットによって連設した、金属ブロックのメタル面接触および第１、第２Ｏリングの弾性接触によるシール構造のものを試験体とした。この試験体の管台部の後端にガス供給配管を連結し、このガス供給配管に、水素ガスを圧送するポンプと、水素ガスの圧力を計測する圧力計を接続した後、その試験体を試験用の耐圧チャンバー内に格納して外気から隔離した。 [Test method]
In the example of the present invention, an airtight test using hydrogen gas having high permeability as the filling gas was performed. For this reason, the nozzle part is cut out from the high-pressure gas container, and the metal surface contact of the metal block and the first one are connected to the tip of the nozzle part by a cap nut as shown in FIG. 4 (b). A specimen having a seal structure by elastic contact of the second O-ring was used as a test specimen. A gas supply pipe is connected to the rear end of the base of the test body, and after connecting a pump for pumping hydrogen gas and a pressure gauge for measuring the pressure of the hydrogen gas to the gas supply pipe, It was stored in a test pressure chamber and isolated from the outside air.

そして、１個の試験体を準備し、この試験体に水素ガスを１０５ＭＰａの圧力になるまで段階的に送り込み、およそ１０ＭＰａ上昇する毎に、試験体（管台部と止栓の間）からの水素ガスの漏出有無を調査した。水素ガスの漏出有無の判断は、ガスクロマトグラフィ法により耐圧チャンバー内の水素ガスを検出することによって行った。なお、このように耐圧チャンバー内で試験を実施する理由は、爆発の危険性のある水素ガスを用いることから、安全上のためである。   Then, one test specimen was prepared, and hydrogen gas was fed into the test specimen in stages until the pressure reached 105 MPa. Every time the pressure increased by about 10 MPa, the test specimen (between the nozzle and stopper) The presence or absence of hydrogen gas leakage was investigated. Judgment of the presence or absence of leakage of hydrogen gas was performed by detecting hydrogen gas in the pressure-resistant chamber by gas chromatography. The reason why the test is carried out in the pressure resistant chamber in this manner is for safety reasons because hydrogen gas with a risk of explosion is used.

本発明例の試験に際し、管台部の材質はＳＣＭ４３５とし、止栓および金属ブロックの材質はＳＵＳ３１６Ｌとした。ＳＣＭ４３５とＳＵＳ３１６Ｌを比較すると、材料強度はＳＣＭ４３５の方が高いため、材料強度の高い管台部側の第１円錐台部および第１凹部のテーパー角度は３０°とし、材料強度の低い止栓側の第２円錐台部および第２凹部のテーパー角度はそれよりも大きい４５°とした。また、第１、第２Ｏリングの材質はＮＢＲとし、第１、第２バックアップリングの材質はＰＴＦＥとした。   In the test of the example of the present invention, the material of the nozzle part was SCM435, and the material of the stopper and the metal block was SUS316L. Comparing SCM435 and SUS316L, the material strength of SCM435 is higher. Therefore, the taper angle of the first truncated cone portion and the first recess on the side of the tube base portion where the material strength is high is 30 °, and the stopper side where the material strength is low The taper angle of the second truncated cone part and the second concave part was 45 °, which was larger than that. The material of the first and second O-rings was NBR, and the material of the first and second backup rings was PTFE.

比較例では、充填ガスとして不燃性の窒素ガスを用いる気密試験を行うこととした。このため、管台部が鏡板部の両方に設けられた高圧ガス容器を用い、一方の管台部の先端に、前記図１に示すように接続管を袋ナットによって連設するとともに、他方の管台部の先端に、止栓を袋ナットによって連設した、金属Ｏリングの弾性接触によるシール構造のものを試験体とした。この試験体の接続管にガス供給配管を連結し、このガス供給配管に、窒素ガスを圧送するポンプと、窒素ガスの圧力を計測する圧力計を接続した。   In the comparative example, an airtight test using nonflammable nitrogen gas as a filling gas was performed. For this reason, a high-pressure gas container in which the nozzle part is provided on both of the end plate parts is used, and at the tip of one of the nozzle parts, a connecting pipe is continuously provided by a cap nut as shown in FIG. A specimen having a seal structure in which a stopper is connected to the tip of the nozzle base by a cap nut and elastic contact with a metal O-ring was used as a test specimen. A gas supply pipe was connected to the connection pipe of the test body, and a pump for feeding nitrogen gas and a pressure gauge for measuring the pressure of the nitrogen gas were connected to the gas supply pipe.

比較例の試験に際し、管台部（高圧ガス容器）の材質はＳＣＭ４３５またはＳＮＣＭ４３９とし、接続管、止栓および金属Ｏリングの材質はＳＵＳ３１６Ｌとした。また、高圧ガス容器は、容量が６０Ｌ（リットル）（ＳＮＣＭ４３９鋼製）のものと１００Ｌ（ＳＣＭ４３５鋼製）のものの２種類を用い、前者を比較例１とし、後者を比較例２とした。   In the test of the comparative example, the material of the nozzle (high pressure gas container) was SCM435 or SNCM439, and the material of the connecting pipe, stopper, and metal O-ring was SUS316L. Two types of high-pressure gas containers having a capacity of 60 L (liter) (made of SNCM439 steel) and 100 L (made of SCM435 steel) were used, the former being Comparative Example 1 and the latter being Comparative Example 2.

そして、比較例１（６０Ｌ容器）では、１１個の試験体を準備し、各試験体に窒素ガスを９０ＭＰａの圧力になるまで段階的に送り込み、比較例２（１００Ｌ容器）では、５個の試験体を準備し、各試験体に窒素ガスを７２ＭＰａの圧力になるまで段階的に送り込み、それぞれ圧力がおよそ１０ＭＰａ上昇する毎に、試験体（管台部と接続管の間）からの窒素ガスの漏出有無を調査した。窒素ガスの漏出有無の判断は、袋ナットに２箇所ずつ設けられたリークポートに検知液を注入し、気泡の発生有無を確認することによって行った。   In Comparative Example 1 (60 L container), 11 test bodies were prepared, and nitrogen gas was fed into each test body in stages until the pressure reached 90 MPa. In Comparative Example 2 (100 L container), Test specimens are prepared, and nitrogen gas is fed in stages to each specimen until a pressure of 72 MPa is reached, and each time the pressure rises by about 10 MPa, nitrogen gas from the specimen (between the tube base and the connecting pipe) is supplied. The presence or absence of leakage was investigated. Judgment of the presence or absence of nitrogen gas leakage was performed by injecting the detection liquid into leak ports provided at two locations on the cap nut and confirming the presence or absence of bubbles.

［評価方法］
本発明例、比較例１および比較例２のいずれもガスの漏出発生率を算出して評価した。本発明例でのガス漏出発生率は、１個の試験体について、ガスの漏出が認められた場合を１００（％）、認められなかった場合を０（％）で表示するものである。一方、比較例１でのガス漏出発生率は、１１個の試験体の計２２箇所のリークポートについて、ガスの漏出が認められたリークポートの数を全リークポート数で除して百分率（％）により表示するものである。同様に、比較例２でのガス漏出発生率は、５個の試験体の計１０箇所のリークポートについて、ガスの漏出が認められたリークポートの数を全リークポート数で除して百分率（％）により表示するものである。 [Evaluation method]
The inventive example, Comparative Example 1 and Comparative Example 2 were all evaluated by calculating the gas leakage occurrence rate. The gas leakage occurrence rate in the example of the present invention is displayed as 100 (%) when gas leakage is recognized and 0 (%) when gas leakage is not recognized for one specimen. On the other hand, the gas leakage occurrence rate in Comparative Example 1 was calculated by dividing the number of leak ports in which gas leakage was observed for a total of 22 leak ports of 11 specimens by the total number of leak ports (% ) Is displayed. Similarly, the gas leak occurrence rate in Comparative Example 2 is a percentage of the total number of leak ports in five test specimens divided by the total number of leak ports, divided by the total number of leak ports. %).

［試験結果］
図６は、実施例の試験結果として充填ガスの圧力と漏出発生率の関係を示す図である。同図に示すように、金属ブロックのメタル面接触および第１、第２Ｏリングの弾性接触によるシール構造の本発明例では、充填ガスが透過性の高い水素ガスであっても、圧力が９０ＭＰａを超える１０５ＭＰａまで全く漏出が発生しなかった。一方、金属Ｏリングの弾性接触によるシール構造の比較例１、２では、充填ガスの圧力が５０ＭＰａを超えたあたりから、漏出の発生が認められた。 [Test results]
FIG. 6 is a diagram showing the relationship between the pressure of the filling gas and the leakage occurrence rate as a test result of the example. As shown in the figure, in the present invention example of the seal structure by the metal surface contact of the metal block and the elastic contact of the first and second O-rings, even if the filling gas is highly permeable hydrogen gas, the pressure is 90 MPa. No leakage occurred at a pressure exceeding 105 MPa. On the other hand, in Comparative Examples 1 and 2 of the seal structure by the elastic contact of the metal O-ring, the occurrence of leakage was recognized when the filling gas pressure exceeded 50 MPa.

本発明のシール構造は、充填ガスの圧力が９０ＭＰａを超えて高い高圧ガス容器に有用である。   The seal structure of the present invention is useful for a high-pressure gas container in which the pressure of the filling gas exceeds 90 MPa.

１：高圧ガス容器、 ２：胴部、 ３：鏡板部、
４：管台部、 ４ａ：先端面、 ４ｂ：雄ねじ、
５：接続管、 ５ａ：端面、 ５ｂ：環状溝、
６：袋ナット、 ６ａ：リークポート、 ７：止栓、
８：フランジ、 ９：押さえ用フランジ、 １０：ボルト、
１１：金属Ｏリング、
２０：金属ブロック、 ２１：円柱部、
２１ａ：第１円周溝、 ２１ｂ：第２円周溝、
２２：第１円錐台部、 ２３：第２円錐台部、
２４：貫通孔、 ２５：第１Ｏリング、 ２６：第２Ｏリング、
２７：第１バックアップリング、 ２８：第２バックアップリング、
３０：第１凹部、 ３１：第１凹部のテーパー面、 ３２：第１凹部の円筒面、
４０：第２凹部、 ４１：第２凹部のテーパー面、 ４２：第２凹部の円筒面、
α１：第１円錐台部のテーパー角度、 β１：第２円錐台部のテーパー角度、
α２：第１凹部テーパー面の角度、 β２：第２凹部テーパー面の角度 1: High pressure gas container, 2: Body, 3: End plate,
4: nozzle section, 4a: tip surface, 4b: male screw,
5: connecting pipe, 5a: end face, 5b: annular groove,
6: Cap nut, 6a: Leak port, 7: Stopcock,
8: Flange, 9: Pressing flange, 10: Bolt,
11: Metal O-ring,
20: metal block, 21: cylindrical part,
21a: first circumferential groove, 21b: second circumferential groove,
22: first truncated cone part, 23: second truncated cone part,
24: Through hole, 25: First O-ring, 26: Second O-ring,
27: First backup ring, 28: Second backup ring,
30: 1st recessed part, 31: The taper surface of a 1st recessed part, 32: The cylindrical surface of a 1st recessed part,
40: 2nd recessed part, 41: Tapered surface of 2nd recessed part, 42: Cylindrical surface of 2nd recessed part,
α1: taper angle of the first truncated cone part, β1: taper angle of the second truncated cone part,
α2: Angle of the first concave tapered surface, β2: Angle of the second concave tapered surface

Claims (6)

高圧ガス容器の管台部とこの管台部に連設される付属品との間のシール構造であって、
円柱部、この円柱部の一端からテーパー状に連なる第１円錐台部、および前記円柱部の他端からテーパー状に連なる第２円錐台部からなり、軸心に沿って貫通孔を有する金属製のブロックと、
前記円柱部の前記第１円錐台部寄りに環装されたゴム製の第１Ｏリングと、
前記円柱部の前記第２円錐台部寄りに環装されたゴム製の第２Ｏリングと、を備え、
前記管台部には、前記第１円錐台部の全体を収容するテーパー面の領域、および前記円柱部の前記第１Ｏリングが環装された部分を収容する円筒面の領域からなる第１凹部が形成され、
前記付属品には、前記第２円錐台部の全体を収容するテーパー面の領域、および前記円柱部の前記第２Ｏリングが環装された部分を収容する円筒面の領域からなる第２凹部が形成されており、
前記管台部の前記第１凹部および前記付属品の前記第２凹部に前記ブロックが収容され、前記付属品が前記管台部に向けて軸方向に押し付けられることにより、前記第１円錐台部の外周面が前記第１凹部の前記テーパー面に圧接するとともに、前記第２円錐台部の外周面が前記第２凹部の前記テーパー面に圧接し、さらに、前記第１Ｏリングが前記第１凹部の前記円筒面に接触するとともに、前記第２Ｏリングが前記第２凹部の前記円筒面に接触した状態にされていること、
を特徴とする高圧ガス容器のシール構造。 A seal structure between a nozzle part of a high-pressure gas container and an accessory connected to the nozzle part,
A cylindrical part, a first truncated cone part that tapers from one end of the cylindrical part, and a second truncated cone part that tapers from the other end of the cylindrical part, and has a through hole along the axis. Block of
A first O-ring made of rubber and provided near the first truncated cone part of the cylindrical part;
A second O-ring made of rubber and provided near the second truncated cone part of the cylindrical part,
The tube base portion includes a first concave portion including a region of a tapered surface that accommodates the entire first truncated cone portion and a region of a cylindrical surface that accommodates a portion of the columnar portion where the first O-ring is mounted. Formed,
The accessory includes a second concave portion including a tapered surface region that accommodates the entire second truncated cone portion and a cylindrical surface region that accommodates a portion of the columnar portion where the second O-ring is mounted. Formed,
The block is accommodated in the first concave portion of the nozzle base portion and the second concave portion of the accessory, and the accessory is pressed in the axial direction toward the nozzle base portion, thereby the first truncated cone portion. And the outer peripheral surface of the second truncated cone part is in pressure contact with the tapered surface of the second recess, and the first O-ring is in contact with the first recess. The second O-ring is in contact with the cylindrical surface of the second recess,
A high pressure gas container sealing structure characterized by the above. 前記ブロックの材質が、極軟鋼、純鉄、銅、アルミニウム、チタンもしくはそれらの合金、またはステンレス鋼であること、
を特徴とする請求項１に記載の高圧ガス容器のシール構造。 The material of the block is extremely soft steel, pure iron, copper, aluminum, titanium or an alloy thereof, or stainless steel,
The high-pressure gas container sealing structure according to claim 1. 前記第１Ｏリングおよび前記第２Ｏリングの材質が合成ゴムであること、
を特徴とする請求項１または２に記載の高圧ガス容器のシール構造。 The material of the first O-ring and the second O-ring is a synthetic rubber;
The seal structure for a high-pressure gas container according to claim 1 or 2. 前記円柱部には、前記第１Ｏリングの前記第２円錐台部側に隣接して前記第１Ｏリングよりも硬い樹脂製の第１バックアップリングが環装され、前記第２Ｏリングの前記第１円錐台部側に隣接して前記第２Ｏリングよりも硬い樹脂製の第２バックアップリングが環装されていること、
を特徴とする請求項１〜３のいずれかに記載の高圧ガス容器のシール構造。 A first back-up ring made of resin harder than the first O-ring is provided adjacent to the cylindrical portion adjacent to the second truncated cone portion of the first O-ring, and the first cone of the second O-ring A second backup ring made of resin harder than the second O-ring is mounted adjacent to the base side,
The seal structure for a high-pressure gas container according to any one of claims 1 to 3. 前記第１円錐台部および前記第２円錐台部それぞれの前記外周面、並びに前記第１凹部および前記第２凹部それぞれの前記テーパー面の表面粗さが算術平均粗さ（Ｒａ）で１．６μｍ以下であること、
を特徴とする請求項１〜４のいずれかに記載の高圧ガス容器のシール構造。 The surface roughness of the outer peripheral surface of each of the first truncated cone part and the second truncated cone part, and the tapered surface of each of the first recessed part and the second recessed part is 1.6 μm in terms of arithmetic average roughness (Ra). That
The seal structure for a high-pressure gas container according to any one of claims 1 to 4. 前記第１円錐台部および前記第２円錐台部それぞれのテーパー角度の加工公差を−２°／＋０°とし、前記第１凹部および前記第２凹部それぞれの前記テーパー面の領域のテーパー角度の加工公差を−０°／＋２°とすること、
を特徴とする請求項１〜５のいずれかに記載の高圧ガス容器のシール構造。 The processing tolerance of the taper angle of each of the first truncated cone part and the second truncated cone part is set to −2 ° / + 0 °, and the taper angle of the region of the tapered surface of each of the first recessed part and the second recessed part is processed. The tolerance is -0 ° / + 2 °,
The seal structure for a high-pressure gas container according to any one of claims 1 to 5.
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