JP5068093B2 - Safety valve for high pressure gas container - Google Patents
Safety valve for high pressure gas container Download PDFInfo
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- JP5068093B2 JP5068093B2 JP2007077391A JP2007077391A JP5068093B2 JP 5068093 B2 JP5068093 B2 JP 5068093B2 JP 2007077391 A JP2007077391 A JP 2007077391A JP 2007077391 A JP2007077391 A JP 2007077391A JP 5068093 B2 JP5068093 B2 JP 5068093B2
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Description
本発明は、高圧ガス容器の安全弁、特にＣＮＧを封入する高圧ガス容器の安全弁の改良に関するものである。 The present invention relates to an improvement in a safety valve for a high-pressure gas container, in particular, a safety valve for a high-pressure gas container enclosing CNG.
従来、ＣＮＧ等を封入する高圧ガス容器のガス出入口には、ガスの出入りを制御する流量制御弁が取り付けられている。この流量制御弁は、機能の異なる３つの弁からなり、所定のガス流量を排出するためのメイン弁（特許文献１参照のこと）と、ガス流量が一定量以上排出される場合にガスの排出を遮断する過流防止弁と、高圧ガス容器が高温になった場合の危険を未然に防止するため、容器内のガスを強制的に排出する安全弁とから構成される。
従来の流量制御弁において、メイン弁と過流防止弁とが故障した場合には、容器内のガスを容易に排出できないという課題が生じる。 In the conventional flow control valve, when the main valve and the overflow prevention valve break down, there arises a problem that the gas in the container cannot be easily discharged.
このような場合に容器内のガスを排出する手立てとしては、安全弁を容器に固定するねじ部を緩めることが考えられるが、この場合には、ねじ部の嵌合長さが不足し、ガスが排出される前にガス圧がねじ部の強度を超えた場合には、ガスが排出される前に安全弁が容器から外れるという問題がある。 In such a case, as a means for discharging the gas in the container, it is conceivable to loosen the screw part that fixes the safety valve to the container. When the gas pressure exceeds the strength of the threaded portion before being discharged, there is a problem that the safety valve is detached from the container before the gas is discharged.
本発明においては、上記の問題点に鑑みてなされたものであり、上記問題点を解決する高圧ガス容器の安全弁を提供することを目的とする。 The present invention has been made in view of the above problems, and an object thereof is to provide a safety valve for a high-pressure gas container that solves the above problems.
第１の発明は、高圧ガス容器の開口部に取り付けられるバルブボディ内に配置され、安全弁として作動する所定条件時に高圧ガス容器内のガスを排出する高圧ガス容器の安全弁において、前記バルブボディの前記高圧ガス容器内と外部とを連通する貫通孔の内周面に形成された雌ねじ部に螺合する雄ねじ部を備えた本体部と、前記本体部内にその中心軸方向に摺動可能に配置され、通常時にガス排出時の流路を閉止し、前記所定条件時に前記本体部に対して中心軸方向に移動して前記流路を開口する弁体と、を備え、前記バルブボディの雌ねじ部と前記本体部の雄ねじ部との嵌合長は、前記高圧ガス容器内のガス圧力に応じてねじ山に作用するせん断力に耐えうる嵌合長として設定されるＬ１と、前記弁体が前記流路を閉止する位置から手動によって前記本体部を前記バルブボディに対して回転して前記弁体を前記中心軸方向に所定長さだけ移動させて前記流路を開口するまでの距離をＬ２に相当する嵌合長と、に基づいてＬ１＋Ｌ２以上の有効長に設定されることを特徴とする高圧ガス容器の安全弁である。 A first invention is a safety valve of a high-pressure gas container that is disposed in a valve body attached to an opening of a high-pressure gas container and discharges gas in the high-pressure gas container under a predetermined condition that operates as a safety valve. A main body portion having a male screw portion threadably engaged with a female screw portion formed on the inner peripheral surface of a through hole that communicates the inside and outside of the high-pressure gas container, and the main body portion is slidably disposed in the central axis direction. A valve body that normally closes the flow path when gas is discharged and moves in a central axis direction with respect to the main body portion under the predetermined condition to open the flow path , and a female thread portion of the valve body, The fitting length of the main body portion with the external thread portion is set as L1 that is set as a fitting length that can withstand a shearing force acting on a screw thread according to the gas pressure in the high-pressure gas container ; manually from the position for closing the road Thus a fitting length corresponding to the distance of said body portion to open the flow path is moved through a prescribed length to rotate the valve body to the central axis direction with respect to the valve body to L2, the The safety valve of the high-pressure gas container is characterized by being set to an effective length of L1 + L2 or more based on it .
第２の発明は、第１の発明において、前記弁体が前記流路を閉止する状態で、前記本体部の端部は、前記バルブボディの前記貫通孔が開口する開口面と同一平面上に配置される高圧ガス容器の安全弁である。 According to a second invention, in the first invention, the valve body closes the flow path, and the end of the main body is flush with an opening surface where the through hole of the valve body opens. It is a safety valve of the high-pressure gas container to be arranged.
第３の発明は、第２の発明において、前記本体部が、前記先端から前記所定長さの位置に指標を設け、この指標が前記開口面と同一平面上に配置されるまで前記本体部を回転移動することで、前記弁体が前記流路を開口するようにした高圧ガス容器の安全弁である。 According to a third invention, in the second invention, the main body portion is provided with an index at a position of the predetermined length from the tip, and the main body portion is arranged until the index is arranged on the same plane as the opening surface. The valve body is a safety valve for a high-pressure gas container that rotates and moves so that the valve body opens the flow path.
第１の発明では、安全弁は、弁体が前記流路を閉止する位置から、本体部をバルブボディに対して回転して弁体を本体部の中心軸方向に所定長さだけ移動させて流路を開口し、弁体が前記流路を閉止する状態において、バルブボディの雌ねじ部と本体部の雄ねじ部との嵌合長は、高圧ガス容器内のガス圧力に応じて設定される嵌合長と流路を開口する所定長さに相当する嵌合長とに基づいて設定されるため、例えば手動にて安全弁の本体部を回転させて流路を開口して高圧ガス容器内のガスを排出する場合でも、嵌合長は高圧ガス容器内のガス圧力に応じた嵌合長を維持しているため、安全弁が高圧ガス容器から外れるようなことはなく、安全に高圧ガス容器内のガスを排出することができる。 In the first invention, the safety valve flows from the position where the valve body closes the flow path by rotating the main body portion relative to the valve body and moving the valve body by a predetermined length in the central axis direction of the main body portion. In the state where the passage is opened and the valve body closes the flow path, the fitting length between the female threaded portion of the valve body and the male threaded portion of the main body is set according to the gas pressure in the high-pressure gas container. Since it is set based on the length and the fitting length corresponding to the predetermined length that opens the flow path, for example, the body of the safety valve is manually rotated to open the flow path, and the gas in the high-pressure gas container Even when discharging, the fitting length maintains the fitting length according to the gas pressure in the high-pressure gas container, so the safety valve will not come off the high-pressure gas container, and the gas in the high-pressure gas container can be safely Can be discharged.
第２、第３の発明では、安全弁の本体部の位置と弁体が流路を開閉状態の関係が視認できるようにしたので、確実に安全弁を操作することができる。 In the second and third aspects of the invention, the relationship between the position of the body portion of the safety valve and the valve body can be visually recognized as to whether the flow path is open or closed, so that the safety valve can be operated reliably.
図１は、本発明に係る高圧ガス容器の安全弁を取り付ける高圧ガス容器の外観図を示す。 FIG. 1 shows an external view of a high-pressure gas container to which a safety valve for a high-pressure gas container according to the present invention is attached.
図１において、１は高圧ガス容器本体、２は流量制御弁であり、図２に示すように流量制御弁２は、容器本体１内から流出するガスの流量を制御するメイン弁３と、流出するガスの流量が所定流量以上になったときにガスの流出を遮断する過流防止弁４と、容器本体１の温度が所定温度となったときに容器本体１内のガスを外部に放出する安全弁５とがバルブボディ６にそれぞれ取り付けられて構成される。 In FIG. 1, 1 is a high-pressure gas container main body, 2 is a flow control valve, and as shown in FIG. 2, the flow control valve 2 includes a main valve 3 for controlling the flow rate of gas flowing out from the container main body 1, and an outflow An overflow prevention valve 4 that shuts off the outflow of gas when the gas flow rate exceeds a predetermined flow rate, and releases the gas in the container main body 1 to the outside when the temperature of the container main body 1 reaches a predetermined temperature. The safety valve 5 is configured to be attached to the valve body 6.
図２、図３を用いて各構成部材を説明する。 Each component will be described with reference to FIGS.
図２は、流量制御弁２を軸方向に貫通する第１貫通孔８の中心線で切った断面図を示し、第１貫通孔８にはメイン弁３と容器本体１側に過流防止弁４が配置される。図３は、安全弁５作動時に容器本体内のガスが外部へ流出する際に流通するガス排出孔１４の断面図である。 FIG. 2 shows a cross-sectional view taken along the center line of the first through hole 8 that passes through the flow control valve 2 in the axial direction. The first through hole 8 has an overflow prevention valve on the main valve 3 and container body 1 side. 4 is arranged. FIG. 3 is a cross-sectional view of the gas discharge hole 14 that flows when the gas in the container body flows out to the outside when the safety valve 5 is operated.
バルブボディ６は、小径部６ａと大径部６ｂとをもつ段付円柱形状を有し、小径部６ａの外周部に端部から雄ねじが形成され、六角断面形状に形成された大径部６ｂをスパナ等の工具により回転することで、容器本体１の開口部に形成された雌ねじと螺合し、バルブボディ６が容器本体１の開口部に取り付けられる。小径部６ａと大径部６ｂとの段差部にはＯリング７が配置されており、容器本体１とバルブボディ６の小径部６ａとの間隙からガスが漏洩することを防止する。 The valve body 6 has a stepped columnar shape having a small-diameter portion 6a and a large-diameter portion 6b. A large-diameter portion 6b formed in a hexagonal cross-sectional shape with a male screw formed from the end on the outer peripheral portion of the small-diameter portion 6a. Is rotated with a tool such as a wrench so as to be screwed into a female screw formed in the opening of the container body 1, and the valve body 6 is attached to the opening of the container body 1. An O-ring 7 is disposed at the step portion between the small diameter portion 6a and the large diameter portion 6b, and gas is prevented from leaking from the gap between the container body 1 and the small diameter portion 6a of the valve body 6.
バルブボディ６には、その中心軸方向に２つの貫通孔８、９が並設される。第１貫通孔８は、径の異なる段付形状を有しており、小径部１０が容器本体１側に配置され、この小径部１０に過流防止弁４が設置される。一方、大径部１１にはメイン弁３が配置され、メイン弁３の操作ハンドル１２の回転操作によりメイン弁３が移動して小径部１０と大径部１１との連通部を開閉する。一方、第２貫通孔９には安全弁５が設置されるが、その詳細は後述する。さらに、第１、第２貫通孔８、９から径方向に穿設されてバルブボディ６の大径部１１の外周面に開口するガス排出孔１３、１４がそれぞれ形成される。 The valve body 6 is provided with two through holes 8 and 9 side by side in the central axis direction. The first through hole 8 has a stepped shape with different diameters, a small diameter portion 10 is disposed on the container body 1 side, and the overflow prevention valve 4 is installed in the small diameter portion 10. On the other hand, the main valve 3 is disposed in the large diameter portion 11, and the main valve 3 is moved by the rotation operation of the operation handle 12 of the main valve 3 to open and close the communicating portion between the small diameter portion 10 and the large diameter portion 11. On the other hand, the safety valve 5 is installed in the second through hole 9, details of which will be described later. Further, gas discharge holes 13 and 14 that are formed in the radial direction from the first and second through holes 8 and 9 and open to the outer peripheral surface of the large diameter portion 11 of the valve body 6 are formed.
メイン弁３は、第１貫通孔８の大径部１１内周面に形成された雌ねじ部に螺合するメイン弁ボディ１５と、メイン弁ボディ１５を軸方向に貫通して配置され、メイン弁ボディ１５に形成された雌ねじ部に螺合することで軸方向に移動可能なメイン弁本体１６と、その回転操作によりメイン弁本体１６を軸方向に移動させる操作ハンドル１２とから構成される。そして、操作ハンドル１２を回してメイン弁本体１６を容器本体１側に移動することでメイン弁本体１６の端面が第１貫通孔８の小径部１０を閉止して、ガスの供給を停止する。一方、操作ハンドル１２を逆方向に回転して小径部１０の開口部を適宜開くことで、開口面積に応じた所定量のガスが容器本体１からガス排出孔１３を経由して外部に供給される。 The main valve 3 is disposed with a main valve body 15 threadedly engaged with an internal thread portion formed on the inner peripheral surface of the large diameter portion 11 of the first through-hole 8, and the main valve body 15 penetrating in the axial direction. The main valve main body 16 is movable in the axial direction by being screwed into a female screw portion formed in the body 15, and the operation handle 12 is configured to move the main valve main body 16 in the axial direction by rotating the main valve main body 16. Then, the operation handle 12 is turned to move the main valve main body 16 toward the container main body 1, whereby the end surface of the main valve main body 16 closes the small diameter portion 10 of the first through hole 8 and stops the gas supply. On the other hand, by rotating the operation handle 12 in the reverse direction to appropriately open the opening of the small diameter portion 10, a predetermined amount of gas corresponding to the opening area is supplied from the container body 1 to the outside via the gas discharge hole 13. The
過流防止弁４は、バルブボディ６内においてメイン弁３のガス流れ方向上流に設置され、バルブボディ６の小径部１０に軸方向に摺動可能に設置される過流防止弁本体１７と、過流防止弁本体１７内に軸方向に摺動可能に、かつガスが内部を流通可能に形成される過流防止弁弁体１８と、この過流防止弁弁体１８を容器本体１側に付勢するばね１９と、を備える。 The overflow prevention valve 4 is installed in the valve body 6 upstream of the main valve 3 in the gas flow direction, and is installed in the small diameter portion 10 of the valve body 6 so as to be slidable in the axial direction. An overflow prevention valve body 18 is formed in the overflow prevention valve body 17 so as to be slidable in the axial direction and through which gas can flow, and the overflow prevention valve body 18 is disposed on the container body 1 side. And an urging spring 19.
過流防止弁４を通過するガスの流量が所定流量以下の場合には、ばね１９が過流防止弁弁体１８を容器本体１側へと付勢して、過流防止弁本体１７と過流防止弁弁体１８との間の間隙が開き、この間隙をガスがメイン弁３側へと流通する。一方、ガスの流量が所定流量を越えると、過流防止弁弁体１８へ作用するガスの圧力がばね１９の付勢力を上回って、過流防止弁弁体１８がメイン弁３側へ移動し、過流防止弁本体１７と過流防止弁弁体１８との間隙を閉止する。閉止した状態では、容器本体１内のガスの圧力が過流防止弁弁体１８に作用して、閉止状態を維持する。閉止状態からメイン弁３の操作ハンドル１２を閉方向へ回すと、メイン弁本体１６の端面１６ａが過流防止弁弁体１８の先端部１８ａを容器本体１側に押し込み、過流防止弁本体１７と過流防止弁弁体１８との間隙が開き、ガスの流通が可能となる。この状態でガスの流量が所定流量以下であれば、過流防止弁弁体１８に作用するガスの圧力とばね１９の付勢力の大小関係は、ばね１９の付勢力が大きいため、間隙は開状態を維持し、ガスが流通される。 When the flow rate of the gas passing through the overflow prevention valve 4 is equal to or less than a predetermined flow rate, the spring 19 biases the overflow prevention valve body 18 toward the container body 1, and A gap with the flow prevention valve body 18 is opened, and gas flows through the gap to the main valve 3 side. On the other hand, when the gas flow rate exceeds a predetermined flow rate, the pressure of the gas acting on the overflow prevention valve body 18 exceeds the urging force of the spring 19, and the overflow prevention valve body 18 moves to the main valve 3 side. The gap between the overflow prevention valve body 17 and the overflow prevention valve body 18 is closed. In the closed state, the pressure of the gas in the container body 1 acts on the overflow prevention valve body 18 to maintain the closed state. When the operation handle 12 of the main valve 3 is turned in the closing direction from the closed state, the end surface 16a of the main valve body 16 pushes the tip 18a of the overflow prevention valve body 18 toward the container body 1 and the overflow prevention valve body 17 is reached. And the overflow prevention valve body 18 are opened, and gas can be circulated. If the gas flow rate is less than or equal to the predetermined flow rate in this state, the relationship between the pressure of the gas acting on the overflow prevention valve body 18 and the biasing force of the spring 19 is large. The state is maintained and gas is distributed.
次に図４から図８を用いて安全弁５の詳細形状を説明する。ここで、図４は安全弁５の断面図であり、図５は安全弁５が取り付けられるバルブボディ６の第２貫通孔９の断面図である。また図６は、バルブボディ６に安全弁５が取り付けられた通常状態での流量制御弁２の断面図であり、図７は、安全弁５が所定温度を超え、溶栓部２２が溶解した後の流量制御弁２の断面図であり、図８は、バルブボディ６に安全弁５が取り付けられ、メイン弁３と過流防止弁４の故障時に、手動によりガスを開放する場合の流量制御弁２の断面図である。 Next, the detailed shape of the safety valve 5 will be described with reference to FIGS. 4 is a sectional view of the safety valve 5, and FIG. 5 is a sectional view of the second through hole 9 of the valve body 6 to which the safety valve 5 is attached. 6 is a cross-sectional view of the flow control valve 2 in a normal state in which the safety valve 5 is attached to the valve body 6. FIG. FIG. 8 is a sectional view of the flow control valve 2. FIG. 8 shows the flow control valve 2 when the safety valve 5 is attached to the valve body 6 and the main valve 3 and the overflow prevention valve 4 are manually opened. It is sectional drawing.
安全弁５は、図４に示すように、有底円筒形状の本体部２０と、本体部２０の内部に摺動可能に配置された弁体２１と、弁体２１の本体部２０内の位置を規定し、所定温度を越えると溶解する溶栓部２２と、溶栓部２２を構成する溶解した材料が排出される孔３６と、図６に示すように弁体２１を本体部２０の底部側へ付勢するばね３５とから構成されている。このような構成で、溶栓部２２の温度が所定温度に達すると溶栓部２２を構成する材料が溶解し、孔３６から排出され、ばね３５の付勢力により弁体２１が底部側へと変位し、容器本体１内のガスが流出される。 As shown in FIG. 4, the safety valve 5 includes a bottomed cylindrical main body 20, a valve body 21 slidably disposed inside the main body 20, and a position of the valve body 21 in the main body 20. The plug portion 22 that melts when the temperature exceeds a predetermined temperature, the hole 36 through which the melted material constituting the plug portion 22 is discharged, and the valve body 21 as shown in FIG. And a spring 35 that biases the spring. With such a configuration, when the temperature of the fusing part 22 reaches a predetermined temperature, the material constituting the fusing part 22 is melted and discharged from the hole 36, and the valve body 21 is moved to the bottom side by the urging force of the spring 35. Displaced and the gas in the container body 1 flows out.
本体部２０は、その外周面に雄ねじが形成された雄ねじ部２３と、雄ねじ部２３の底部側外周面に形成されたソケットレンチ等の工具が掛かる六角断面の六角部２４とから構成される。内周面側は、底部側が小径の段付形状の底付き孔部が形成され、小径孔２５と大径孔２６それぞれに摺接するように弁体２１が形成される。 The main body portion 20 includes a male screw portion 23 having a male screw formed on the outer peripheral surface thereof and a hexagonal section 24 having a hexagonal cross section on which a tool such as a socket wrench is formed on the bottom outer peripheral surface of the male screw portion 23. On the inner peripheral surface side, a bottomed hole portion having a stepped shape with a small diameter is formed on the bottom side, and a valve body 21 is formed so as to be in sliding contact with the small diameter hole 25 and the large diameter hole 26, respectively.
弁体２１は、本体部２０の小径孔２５に摺接する第１摺動部２７と、大径孔２６に摺接する第２摺動部２８と、容器本体１側に形成され、バルブボディ６の第２貫通孔９を閉止する第３摺動部２９とから構成される。 The valve body 21 is formed on the container body 1 side with a first sliding portion 27 slidably contacting the small diameter hole 25 of the main body portion 20, a second sliding portion 28 slidably contacting the large diameter hole 26, and the valve body 6. The third through hole 9 is configured to close the second through hole 9.
図５に示すように、安全弁５が取り付けられるバルブボディ６の第２貫通孔９は、段付形状に形成され、容器本体１側に小径側が形成される。第２貫通孔９の小径孔３０に弁体２１の第３摺動部２９が摺接し、弁体２１が小径孔３０に押し込まれた状態で第３摺動部２９の外周面に設置されたＯリングにより小径孔３０が閉鎖される。また、大径孔３１には雌ねじ部３２が形成されて、本体部２０の雄ねじ部２３と螺合する。 As shown in FIG. 5, the 2nd through-hole 9 of the valve body 6 to which the safety valve 5 is attached is formed in a step shape, and the small diameter side is formed in the container main body 1 side. The third sliding portion 29 of the valve body 21 is in sliding contact with the small diameter hole 30 of the second through hole 9, and the valve body 21 is installed on the outer peripheral surface of the third sliding portion 29 in a state of being pushed into the small diameter hole 30. The small diameter hole 30 is closed by the O-ring. In addition, a female screw portion 32 is formed in the large diameter hole 31 and is screwed into the male screw portion 23 of the main body portion 20.
本体部２０内周側の小径孔２５と大径孔２６との径違いにより形成される段差部３３と、弁体２１の第１摺動部２７と第２摺動部２８との径違いによる段差部３４とが軸方向に所定間隔にて対峙し、この所定の間隔は溶栓部２２の軸方向長さにより規定される。前述したように、溶栓部２２は所定の温度に達すると溶解し、弁体２１が軸方向へ変位可能となる。溶栓部２２の軸方向長さは、第３摺動部２９により第２貫通孔９の小径孔３０を閉鎖していた弁体２１が軸方向への変位により第２貫通孔９の小径孔３０を開口するのに必要な長さである。図６に示すように、バルブボディ６の大径孔３１内には弁体２１を底部側に付勢するばね３５が設置され、溶栓部２２が溶解した後、ばね３５の付勢力により弁体２１が軸方向に移動し、第２貫通孔９の小径孔３０を開口する。また本体部２０には溶解した溶栓部２２を構成する材料を外部に放出する孔３６が六角部２４の端面に開口して形成される。 Due to the difference in diameter between the stepped portion 33 formed by the difference in diameter between the small diameter hole 25 and the large diameter hole 26 on the inner peripheral side of the main body 20, and the first sliding portion 27 and the second sliding portion 28 of the valve body 21. The stepped portion 34 faces the axial direction at a predetermined interval, and the predetermined interval is defined by the axial length of the fusing plug portion 22. As described above, the fusing part 22 melts when it reaches a predetermined temperature, and the valve body 21 can be displaced in the axial direction. The axial length of the fusing part 22 is such that the valve body 21 that has closed the small-diameter hole 30 of the second through-hole 9 by the third sliding part 29 is displaced in the axial direction to reduce the small-diameter hole of the second through-hole 9. This is the length necessary to open 30. As shown in FIG. 6, a spring 35 for urging the valve body 21 toward the bottom side is installed in the large-diameter hole 31 of the valve body 6, and after the fusing part 22 is melted, the valve 35 is urged by the urging force of the spring 35. The body 21 moves in the axial direction and opens the small diameter hole 30 of the second through hole 9. Further, a hole 36 for discharging the material constituting the melted plug portion 22 to the outside is formed in the main body portion 20 so as to open to the end face of the hexagonal portion 24.
このように構成されて、図６から図８を用いて安全弁５の作動状態を説明する。 The operation state of the safety valve 5 configured as described above will be described with reference to FIGS. 6 to 8.
図６は、安全弁５がガスの流れを遮断している通常状態を示し、図７は、安全弁５の温度が所定温度を超えて、溶栓部２２が溶解し、ガスがガス排出孔１４から排出される状態を示す。そして図８は、手動により安全弁５を操作して、ガスをガス排出孔１４から排出する状態を示している。 FIG. 6 shows a normal state in which the safety valve 5 blocks the gas flow, and FIG. 7 shows that the temperature of the safety valve 5 exceeds a predetermined temperature, the fusing part 22 is dissolved, and the gas is discharged from the gas discharge hole 14. Indicates the state of being discharged. FIG. 8 shows a state in which the safety valve 5 is manually operated to discharge gas from the gas discharge hole 14.
図６において、安全弁５の六角部２４を工具を用いて右回転させると安全弁５は容器本体１側に雄ねじ部２３の作用によりねじ込まれる。そして、六角部２４の端面２４ａがバルブボディ６の第２貫通孔９が開口する端面６ｃと略同一平面となる位置までねじ込むと、弁体２１の第３摺動部２９がバルブボディ６の小径孔３０を閉止する。したがって、この通常状態では、容器本体１内のガスは、安全弁５から排出されることはない。 In FIG. 6, when the hexagonal portion 24 of the safety valve 5 is rotated to the right using a tool, the safety valve 5 is screwed into the container body 1 side by the action of the male screw portion 23. Then, when the end surface 24a of the hexagonal portion 24 is screwed to a position where it is substantially flush with the end surface 6c where the second through hole 9 of the valve body 6 opens, the third sliding portion 29 of the valve body 21 has a small diameter of the valve body 6. The hole 30 is closed. Therefore, in this normal state, the gas in the container body 1 is not discharged from the safety valve 5.
図７は、安全弁５の溶栓部２２が溶解した状態を示しており、溶栓部２２の占めていたスペースにばね３５の付勢力により弁体２１が移動することで、バルブボディ６の小径孔３０が開放され、ガスがガス排出孔１４から排出される。 FIG. 7 shows a state where the fusing part 22 of the safety valve 5 is melted, and the valve body 21 is moved by the urging force of the spring 35 to the space occupied by the fusing part 22, thereby reducing the small diameter of the valve body 6. The hole 30 is opened and the gas is discharged from the gas discharge hole 14.
図８は、安全弁５の六角部２４を工具を用いて手動により回転させて、安全弁５をバルブボディ６から突出させてバルブボディ６の小径孔３０が開放した状態を説明する図である。六角部２４を左回転させると安全弁５は、雄ねじ部２３の作用によりバルブボディ６から突出してくる。そして、六角部２４と雄ねじ部２３との段差部３７とバルブボディ６の端面６ｃとが略同一平面となるまで六角部２４を回転させると、安全弁５の弁体２１の第３摺動部２９がバルブボディ６の小径孔３０から離れ、容器本体１とガス排出孔１４とを連通させ、ガスが放出される。 FIG. 8 is a view for explaining a state where the hexagonal portion 24 of the safety valve 5 is manually rotated using a tool, the safety valve 5 is protruded from the valve body 6 and the small-diameter hole 30 of the valve body 6 is opened. When the hexagonal portion 24 is rotated counterclockwise, the safety valve 5 protrudes from the valve body 6 by the action of the male screw portion 23. When the hexagonal portion 24 is rotated until the stepped portion 37 between the hexagonal portion 24 and the male screw portion 23 and the end surface 6c of the valve body 6 are substantially flush with each other, the third sliding portion 29 of the valve body 21 of the safety valve 5 is obtained. Is separated from the small-diameter hole 30 of the valve body 6 to allow the container body 1 and the gas discharge hole 14 to communicate with each other, and gas is released.
図９は、安全弁５手動操作時に本体部２０の六角部２４の端面２４ａとバルブボディ６の端面６ｃとを略同一平面として、第３摺動部２９が確実にバルブボディ６の小径孔３０を閉止する場合のねじ部の寸法関係を説明する図である。図１０は、安全弁５手動時に本体部２０の六角部２４の段差部３７とバルブボディ６の端面６ｃとを略同一平面として、第３摺動部２９が確実にバルブボディ６の小径孔３０を開口する場合のねじ部の寸法関係を説明する図である。 9 shows that when the safety valve 5 is manually operated, the end surface 24a of the hexagonal portion 24 of the main body portion 20 and the end surface 6c of the valve body 6 are substantially flush with each other so that the third sliding portion 29 can reliably make the small-diameter hole 30 of the valve body 6 open. It is a figure explaining the dimensional relationship of the thread part in the case of closing. 10 shows that when the safety valve 5 is manually operated, the stepped portion 37 of the hexagonal portion 24 of the main body portion 20 and the end surface 6c of the valve body 6 are made substantially flush with each other so that the third sliding portion 29 can reliably make the small-diameter hole 30 of the valve body 6. It is a figure explaining the dimensional relationship of the thread part in the case of opening.
図において、Ｌ１は、雄ねじ部２３と雌ねじ部３２とからなるねじ部の強度、特にねじ山のせん断強度が容器本体１内の圧力に応じてねじ山に作用するせん断力に耐えうるねじの嵌合長であり、Ｌ２は安全弁５がバルブボディ６の小径孔３０を閉止する基準位置から、手動により小径孔３０を開口するのに必要な安全弁５の軸方向移動量である。 In the figure, L1 is the fitting of a screw that can withstand the shearing force that acts on the thread according to the pressure in the container body 1 according to the strength of the threaded part composed of the male threaded part 23 and the female threaded part 32, in particular the shearing strength of the threaded thread. L2 is an axial movement amount of the safety valve 5 that is required to manually open the small diameter hole 30 from a reference position where the safety valve 5 closes the small diameter hole 30 of the valve body 6.
ここで、手動により安全弁５が軸方向に移動し、安全弁５がバルブボディ６の小径孔３０を開口した場合でも、雄ねじ部２３と雌ねじ部３２のねじの嵌合長Ｌ１が確保されていれば容器本体１内のガス圧力により安全弁５が外れることはない。したがって、安全弁５が小径孔３０を閉止する基準位置、例えば安全弁５の六角部２４の端面２４ａがバルブボディ６の端面６ｃと同一平面となる位置で、雄ねじ部２３と雌ねじ部３２のそれぞれのねじの有効長ａ１、ａ２は（Ｌ１＋Ｌ２）以上が必要であり、このようにすることで、基準位置からＬ２だけ移動して安全弁５が小径孔３０を開く位置、例えば六角部２４の段差部３７とバルブボディ６の端面６ｃが同一面となる位置での雄ねじ部２３と雌ねじ部３２の嵌合長は、容器本体１内のガス圧力により安全弁５が外れることがない嵌合長Ｌ１を確保することができる。 Here, even when the safety valve 5 is moved manually in the axial direction and the safety valve 5 opens the small-diameter hole 30 of the valve body 6, if the fitting length L1 of the male screw portion 23 and the female screw portion 32 is secured. The safety valve 5 does not come off due to the gas pressure in the container body 1. Therefore, each screw of the male screw portion 23 and the female screw portion 32 is a reference position where the safety valve 5 closes the small-diameter hole 30, for example, a position where the end surface 24a of the hexagonal portion 24 of the safety valve 5 is flush with the end surface 6c of the valve body 6. Effective lengths a1 and a2 of (L1 + L2) or more are necessary, and in this way, the position where the safety valve 5 moves by L2 from the reference position and opens the small diameter hole 30, for example, the stepped portion 37 of the hexagonal portion 24 and The fitting length of the male screw portion 23 and the female screw portion 32 at a position where the end surface 6c of the valve body 6 is the same surface is ensured to be a fitting length L1 at which the safety valve 5 does not come off due to gas pressure in the container body 1. Can do.
このような寸法関係にすることで、バルブボディ６の小径孔３０を閉止する基準位置、例えば安全弁５の六角部２４の端面２４ａがバルブボディ６の端面６ｃと同一平面となる位置を目視にて確認し、手動により安全弁５を回転させてバブルボディ６から突出させ、安全弁５が小径孔３０を開口する位置、例えばバルブボディ６の段差部３７と六角部２４の端面６ｃが同一面となる位置まで目視により確認しつつ安全弁５を移動することで、容器本体１内のガス圧力により安全弁５が外れることがなく、容器本体１内のガスをガス排出孔１４から排出することができる。 With such a dimensional relationship, a reference position for closing the small diameter hole 30 of the valve body 6, for example, a position where the end surface 24a of the hexagonal portion 24 of the safety valve 5 is flush with the end surface 6c of the valve body 6 is visually observed. Check and manually rotate the safety valve 5 to protrude from the bubble body 6, the position where the safety valve 5 opens the small diameter hole 30, for example, the position where the stepped portion 37 of the valve body 6 and the end surface 6 c of the hexagonal portion 24 are the same surface. By moving the safety valve 5 while visually confirming until the safety valve 5 is not released by the gas pressure in the container body 1, the gas in the container body 1 can be discharged from the gas discharge hole 14.
本発明は上記の実施の形態に限定されずに、その技術的な思想の範囲内において種々の変更がなしうることは明白である。 The present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.
Ｌ１ 嵌合長
Ｌ２ 安全弁の軸方向移動量
１ 容器本体
２ 流量制御弁
５ 安全弁
６ バルブボディ
６ａ 小径部
６ｂ 大径部
６ｃ 端面
８ 第１貫通孔
９ 第２貫通孔
２０ 本体部
２１ 弁体
２２ 溶栓部
２３ 雄ねじ部
２４ 六角部
２５ 小径孔
２６ 大径孔
２７ 第１摺動部
２８ 第２摺動部
２９ 第３摺動部
３０ 小径孔
３１ 大径孔
３２ 雌ねじ部
３３ 段差部
３４ 段差部
３５ ばね
３６ 孔
３７ 段差部
L1 fitting length L2 axial displacement of safety valve 1 container body 2 flow control valve 5 safety valve 6 valve body 6a small diameter part 6b large diameter part 6c end face 8 first through hole 9 second through hole 20 main body part 21 valve element 22 melted Plug part 23 Male thread part 24 Hexagon part 25 Small diameter hole 26 Large diameter hole 27 First sliding part 28 Second sliding part 29 Third sliding part 30 Small diameter hole 31 Large diameter hole 32 Female thread part 33 Step part 34 Step part 35 Spring 36 Hole 37 Stepped part
Claims (3)
前記バルブボディの前記高圧ガス容器内と外部とを連通する貫通孔の内周面に形成された雌ねじ部に螺合する雄ねじ部を備えた本体部と、
前記本体部内にその中心軸方向に摺動可能に配置され、通常時にガス排出時の流路を閉止し、前記所定条件時に前記本体部に対して中心軸方向に移動して前記流路を開口する弁体と、
を備え、
前記バルブボディの雌ねじ部と前記本体部の雄ねじ部との嵌合長は、前記高圧ガス容器内のガス圧力に応じてねじ山に作用するせん断力に耐えうる嵌合長として設定されるＬ１と、前記弁体が前記流路を閉止する位置から手動によって前記本体部を前記バルブボディに対して回転して前記弁体を前記中心軸方向に所定長さだけ移動させて前記流路を開口するまでの距離をＬ２に相当する嵌合長と、に基づいてＬ１＋Ｌ２以上の有効長に設定されることを特徴とする高圧ガス容器の安全弁。 In the safety valve of the high-pressure gas container that is arranged in the valve body attached to the opening of the high-pressure gas container and discharges the gas in the high-pressure gas container at a predetermined condition that operates as a safety valve,
A main body portion having a male screw portion that is screwed into a female screw portion formed on an inner peripheral surface of a through hole that communicates the inside and outside of the high-pressure gas container of the valve body;
It is slidably disposed in the central axis direction in the main body, and closes the flow path when the gas is discharged during normal operation, and moves in the central axis direction with respect to the main body when the predetermined condition is reached to open the flow path a valve body which,
With
The fitting length between the female threaded portion of the valve body and the male threaded portion of the main body is set as L1 that is set as a fitting length that can withstand the shearing force acting on the thread according to the gas pressure in the high-pressure gas container. The valve body is manually rotated from the position where the valve body closes the flow path, and the valve body is moved by a predetermined length in the central axis direction to open the flow path. A safety valve for a high-pressure gas container, wherein the effective length is set to an effective length of L1 + L2 or more based on a fitting length corresponding to L2.
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| JP5379467B2 (en) * | 2008-12-24 | 2013-12-25 | カヤバ工業株式会社 | Vehicle height adjustment device |
| JP5386249B2 (en) * | 2009-07-03 | 2014-01-15 | トヨタ自動車株式会社 | Valve device for high-pressure tank for vehicles |
| JP5333145B2 (en) * | 2009-10-14 | 2013-11-06 | トヨタ自動車株式会社 | Valve device for high-pressure tank for vehicles |
| JP5270518B2 (en) * | 2009-10-30 | 2013-08-21 | トヨタ自動車株式会社 | Safety valve device |
| KR101464493B1 (en) * | 2013-10-25 | 2014-11-24 | 주식회사 대륙제관 | Over pressure safety relief valve for portable gas container |
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| JPS4932896Y1 (en) * | 1970-03-19 | 1974-09-05 | ||
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| JPS49150027U (en) * | 1973-04-20 | 1974-12-25 | ||
| JPS505229U (en) * | 1973-05-10 | 1975-01-20 | ||
| JPS5094547U (en) * | 1973-12-19 | 1975-08-08 | ||
| JPS5174224U (en) * | 1974-12-10 | 1976-06-11 | ||
| JPS646472U (en) * | 1987-06-30 | 1989-01-13 | ||
| JPH0674855B2 (en) * | 1987-12-29 | 1994-09-21 | 宣行 杉村 | Combined relief and stop valve |
| JPH04254078A (en) * | 1991-02-06 | 1992-09-09 | Mitsubishi Electric Corp | Drain cock for water heating apparatus |
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| JP4593811B2 (en) * | 2000-03-02 | 2010-12-08 | 株式会社ハマイ | Safety valve and integrated valve |
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