JP5032877B2 - Pressure regulator - Google Patents

Pressure regulator Download PDF

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JP5032877B2
JP5032877B2 JP2007098347A JP2007098347A JP5032877B2 JP 5032877 B2 JP5032877 B2 JP 5032877B2 JP 2007098347 A JP2007098347 A JP 2007098347A JP 2007098347 A JP2007098347 A JP 2007098347A JP 5032877 B2 JP5032877 B2 JP 5032877B2
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diaphragm
pressure reducing
switching
pressure chamber
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JP2008257440A (en
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年彦 鈴木
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Yazaki Corp
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Description

本発明は、液化ガス供給源からの液化ガス（ＬＰＧ）を使用先の圧力に調整して供給する圧力調整器に係り、特に、ガスボンベの圧力低下を検知して自動的に他のガスボンベに切り替えて継続してＬＰＧを供給する自動切替機構を備えた圧力調整器に関する。   The present invention relates to a pressure regulator that adjusts and supplies a liquefied gas (LPG) from a liquefied gas supply source to a pressure at a use destination, and in particular, detects a pressure drop of a gas cylinder and automatically switches to another gas cylinder. It is related with the pressure regulator provided with the automatic switching mechanism which supplies LPG continuously.

一般に、液化ガス供給源である例えばガスボンベからのＬＰＧを、使用先の燃焼器などのガス器具に適した圧力に調整するために圧力調整器が用いられている。このような圧力調整器としては、例えば、特許文献1、２に記載されているように、ガスボンベ等から供給される高圧（例えば、０．１５〜１．５６ＭＰａ）のＬＰＧを、一旦中圧（例えば、０．１２ＭＰａ程度）に減圧し、さらに低圧（例えば、２．５５〜３．３ｋＰａ程度）に減圧するものが知られている。   In general, a pressure regulator is used to adjust LPG from, for example, a gas cylinder as a liquefied gas supply source to a pressure suitable for a gas appliance such as a combustor at a use destination. As such a pressure regulator, for example, as described in Patent Documents 1 and 2, a high pressure (for example, 0.15 to 1.56 MPa) LPG supplied from a gas cylinder or the like is temporarily used. For example, the pressure is reduced to about 0.12 MPa and further reduced to a low pressure (for example, about 2.55 to 3.3 kPa).

また、それら特許文献１、２の中圧減圧部は、一又は複数からなる一方のガスボンベ系統が空に近くなったときに、予備の一又は複数からなる他方のガスボンベ系統に自動的に切り替えて、使用先に継続してＬＰＧを供給する自動切替機構を備えて構成されている。すなわち、コイルスプリングで設定圧に応じて付勢されたダイヤフラムにより中圧室を画成し、中圧室に第１と第２の減圧弁を介して２つの流入ポートを連通させ、それぞれの流入ポートに一方のガスボンベ系統と他方のガスボンベ系統を接続する。そして、中圧室のダイヤフラムの変位に応じて第１又は第２の減圧弁の開度を調整して中圧室の圧力を調整するようになっている。特に、ダイヤフラムの変位領域を２段階に分け、小さい変位領域では一方（第１又は第２）の減圧弁を作動させ、大きい変位領域では他方（第２又は第１）の減圧弁を作動させる自動切替機構が備えられている。   Moreover, when the one or more gas cylinder systems consisting of one or a plurality of the gas pressure reducing sections of Patent Documents 1 and 2 are nearly empty, they are automatically switched to the other gas cylinder system consisting of one or more spares. An automatic switching mechanism that continuously supplies LPG to the user is provided. That is, an intermediate pressure chamber is defined by a diaphragm energized according to a set pressure by a coil spring, and two inflow ports are communicated with the intermediate pressure chamber via the first and second pressure reducing valves. Connect one gas cylinder system and the other gas cylinder system to the port. The pressure of the intermediate pressure chamber is adjusted by adjusting the opening of the first or second pressure reducing valve in accordance with the displacement of the diaphragm of the intermediate pressure chamber. In particular, the diaphragm displacement area is divided into two stages, and one (first or second) pressure reducing valve is operated in a small displacement area, and the other (second or first) pressure reducing valve is operated in a large displacement area. A switching mechanism is provided.

特許文献１、２に記載の自動切替機構は、ダイヤフラムに切替軸を回動自在に連結し、その切替軸の先端に円板状の切替カムを設け、切替カムの下面のカム面の対称位置に凸状部と凹状部を設け、凸状部と凹状部に第１と第２の減圧弁を作動させる弁棒を当接させて形成されている。これにより、ダイヤフラムの変位領域が小さい変位領域では、凸状部に当接する弁棒の例えば第１の減圧弁が開閉作動され、凹状部に当接する弁棒の第２の減圧弁は閉じた状態に保持される。そして、第１の減圧弁に連通されたガスボンベ系統のＬＰＧが空に近くなると、中圧室の圧力が大きく低下し、ダイヤフラムの変位が大きくなって凹状部に当接する弁棒の第２の減圧弁が開閉作動され、第２の減圧弁に連通されたガスボンベ系統に切り替えられる。その後、空になったガスボンベ系統を新たなガスボンベに置き換え、切替軸を回転して第２の減圧弁の弁棒に当接する切替カムのカム面を凹状部から凸状部に切り替えて、初期状態に戻す。   In the automatic switching mechanisms described in Patent Documents 1 and 2, a switching shaft is rotatably connected to a diaphragm, a disc-shaped switching cam is provided at the tip of the switching shaft, and the symmetrical position of the cam surface on the lower surface of the switching cam A convex portion and a concave portion are provided, and a valve rod for operating the first and second pressure reducing valves is brought into contact with the convex portion and the concave portion. Thereby, in a displacement region where the displacement region of the diaphragm is small, for example, the first pressure reducing valve of the valve rod contacting the convex portion is opened and closed, and the second pressure reducing valve of the valve rod contacting the concave portion is closed. Retained. Then, when the LPG of the gas cylinder system connected to the first pressure reducing valve becomes nearly empty, the pressure in the intermediate pressure chamber is greatly reduced, the displacement of the diaphragm is increased, and the second pressure reduction of the valve stem that contacts the concave portion. The valve is opened and closed to switch to the gas cylinder system communicated with the second pressure reducing valve. After that, replace the emptied gas cylinder system with a new gas cylinder, rotate the switching shaft and switch the cam surface of the switching cam that contacts the valve rod of the second pressure reducing valve from the concave part to the convex part. Return to.

このように構成されることから、特許文献１、２に記載の圧力調整器によれば、ガスボンベから供給される高圧のＬＰＧを一旦中圧に減圧した後、使用先のガス圧力に応じた低圧に減圧して供給できるとともに、ガスボンベの圧力低下を検知して自動的に他のガスボンベに切り替えて継続してＬＰＧを供給することができる。   With this configuration, according to the pressure regulators described in Patent Documents 1 and 2, the high pressure LPG supplied from the gas cylinder is once reduced to an intermediate pressure, and then the low pressure corresponding to the gas pressure at the use destination. It is possible to supply the LPG by reducing the pressure of the gas cylinder and automatically switching to another gas cylinder by detecting the pressure drop of the gas cylinder.

特開平７−０７８０３３号公報Japanese Patent Application Laid-Open No. 7-078033 特開２００４−２２７０８８公報JP 2004-227088 A

ところで、特許文献１、２に記載された圧力調整器の中圧減圧部のダイヤフラムは、第１又は第２の減圧弁の開閉動作に応じた圧力変動により微小に振動し、これによりダイヤフラムに連結された中圧減圧部の部品が振動して異音が発生するという問題がある。   By the way, the diaphragm of the intermediate pressure reducing part of the pressure regulator described in Patent Documents 1 and 2 vibrates slightly due to pressure fluctuations according to the opening / closing operation of the first or second pressure reducing valve, and is thus connected to the diaphragm. There is a problem that abnormal noise is generated due to vibration of the components of the intermediate pressure reducing portion.

そこで、特許文献１、２では、ダイヤフラムに連結された切替軸の外周面にＯリングパッキンを装着し、切替軸を回転可能にかつ軸方向に摺動可能に支持する筒状部材との間に適度な摺動抵抗を持たせて、ダイヤフラム及び切替軸の振動を抑制して、異音の発生を抑えている。   Therefore, in Patent Documents 1 and 2, an O-ring packing is attached to the outer peripheral surface of the switching shaft connected to the diaphragm, and the switching shaft is supported between the cylindrical member that can rotate and slide in the axial direction. Appropriate sliding resistance is provided to suppress the vibration of the diaphragm and the switching shaft, thereby suppressing the generation of abnormal noise.

しかしながら、圧力調整器の容量、つまり流通するガス量が大きくなる程、例えば８ｋｇ／ｈから１０ｋｇ／ｈに増量すると、ダイヤフラムの変位量に応じて切替軸の摺動ストロークが長くなるため、異音が発生しやすくなり、従来のＯリングパッキンの摺動抵抗程度では対応することが困難になることが予想される。   However, if the capacity of the pressure regulator, that is, the amount of gas flowing is increased, for example, when the pressure is increased from 8 kg / h to 10 kg / h, the sliding stroke of the switching shaft becomes longer according to the displacement of the diaphragm. It is expected that it will be difficult to cope with the sliding resistance of conventional O-ring packing.

そこで、Ｏリングパッキンの断面形状を例えば長円形にして、切替軸を支持する筒状部材との接触面積を広げることにより、摺動抵抗を高めることが考えられる。しかし、単に摺動抵抗を高めると、減圧弁の応答速度が遅れるから、圧力調整器の出口を急に閉じた場合の瞬間閉塞圧力が上昇するという問題が発生する。   Therefore, it is conceivable to increase the sliding resistance by making the cross-sectional shape of the O-ring packing, for example, an oval shape and increasing the contact area with the cylindrical member that supports the switching shaft. However, if the sliding resistance is simply increased, the response speed of the pressure reducing valve is delayed, which causes a problem that the instantaneous closing pressure increases when the outlet of the pressure regulator is suddenly closed.

また、切替軸を支持する筒状部材をツメ部を介して圧力調整器の上カバーに係止する構造を採用すると、切替軸の摺動ストロークが長くなることによってツメ部への負担が増大し、耐久性が低下するおそれがあるという問題がある。   In addition, if a structure is adopted in which the cylindrical member that supports the switching shaft is locked to the upper cover of the pressure regulator via the claw portion, the burden on the claw portion increases due to the longer sliding stroke of the switching shaft. There is a problem that durability may be lowered.

これらの問題は、自動切替機構を備えた中圧減圧部において顕著であるが、自動切替機構を備えていない圧力調整器のダイヤフラムの振動を、ダイヤフラムに連結された軸体とその軸体を摺動自在に支持する筒体との間の摺動抵抗により抑制する場合にも、共通の問題である。   These problems are conspicuous in the intermediate pressure reducing section equipped with the automatic switching mechanism, but the vibration of the diaphragm of the pressure regulator not equipped with the automatic switching mechanism is caused to slide between the shaft body connected to the diaphragm and the shaft body. This is also a common problem when it is suppressed by sliding resistance between the cylinder body that is movably supported.

本発明が解決しようとする課題は、圧力調整器のダイヤフラム等の振動を抑制して異音の発生を抑えることができ、かつ耐久性を向上させることにある。   The problem to be solved by the present invention is to suppress the generation of abnormal noise by suppressing the vibration of the diaphragm of the pressure regulator and to improve the durability.

上記の課題を解決するため、本発明は、液化ガス供給源に接続される入力ポートと、該入力ポートに連通された減圧弁と、該減圧弁の減圧側に連通された圧力室と、該圧力室に連通された減圧ガス出口流路と、前記圧力室の一部の室壁を画成するダイヤフラムと、該ダイヤフラムを前記圧力室の圧力に抗して付勢するばね部材と、前記ダイヤフラムに連結されて軸方向に変位する軸体と、該軸体を軸方向に摺動自在に支持する筒体と、該筒体の内面に対向する前記軸体の外周に形成された凹溝内に装着されたリングパッキンと、前記ダイヤフラムの変位に応じて前記減圧弁を開閉する弁棒を備えてなる圧力調整器において、前記軸体の外周に装着されたリングパッキンは、断面が長円形に形成され、前記筒体の内面に対向する面に周方向に沿って凹溝が形成されてなることを特徴とする。   In order to solve the above problems, the present invention includes an input port connected to a liquefied gas supply source, a pressure reducing valve communicated with the input port, a pressure chamber communicated with a pressure reducing side of the pressure reducing valve, A decompression gas outlet channel communicated with the pressure chamber, a diaphragm defining a part of a wall of the pressure chamber, a spring member urging the diaphragm against the pressure of the pressure chamber, and the diaphragm A shaft body connected to the shaft and displaced in the axial direction, a cylindrical body that supports the shaft body so as to be slidable in the axial direction, and a concave groove formed on the outer periphery of the shaft body facing the inner surface of the cylindrical body In the pressure regulator comprising a ring packing attached to the valve and a valve rod that opens and closes the pressure reducing valve according to the displacement of the diaphragm, the ring packing attached to the outer periphery of the shaft body has an oval cross section. Formed in a circumferential direction on a surface facing the inner surface of the cylindrical body. Wherein the groove is formed Te.

すなわち、ダイヤフラムに連動して変位する軸体を摺動自由に支持する筒体との間の摺動抵抗を適切に管理するため、軸体の外周に装着するリングパッキンの断面を長円形にし、さらに筒体の内面に対向するリングパッキンの面に周方向に沿って凹溝を形成する。これにより、２点で筒体内面に接触するから、初期でも一定の摺動抵抗を確保でき、耐久性を向上して摺動抵抗の上昇を抑えることができる。また、リングパッキンの断面を長円形にしたことから、パッキンの摺動方向両端部の曲率を大きくとることにより、摺動方向の反対側にパッキンが引っ張られるのを防止できる。これらにより、圧力調整器のダイヤフラム等の振動を抑制して異音の発生を抑えることができ、かつ耐久性を向上させることができる。   That is, in order to appropriately manage the sliding resistance between the cylindrical body that freely slides and supports the shaft body that is displaced in conjunction with the diaphragm, the cross section of the ring packing that is attached to the outer periphery of the shaft body is made oval. Further, a groove is formed along the circumferential direction on the surface of the ring packing facing the inner surface of the cylinder. Thereby, since it contacts the cylinder inner surface at two points, a constant sliding resistance can be secured even in the initial stage, durability can be improved, and an increase in sliding resistance can be suppressed. In addition, since the ring packing has an oval cross section, it is possible to prevent the packing from being pulled to the opposite side of the sliding direction by increasing the curvature at both ends in the sliding direction of the packing. As a result, it is possible to suppress vibrations such as the diaphragm of the pressure regulator to suppress the generation of abnormal noise, and to improve durability.

この場合において、リングパッキンの全周にグリースを塗布するが、特に凹溝の内部にはグリースが十分に付着していることが好ましい。これにより、ダイヤフラムの振動によりリングパッキンが振動的に摺動を繰り返しても、凹溝の中央にグリースが残るので、摺動抵抗の急激な上昇を抑えることができる。また、リングパッキンを合成ゴムで形成し、さらにゴムの硬度を従来の硬度（例えば、Ａ７０±５程度）よりもＡ１０程度（例えば、Ａ８０±５程度）に硬度を上げることが好ましい。これにより、パッキン表面の変形量を減少させることができる。   In this case, grease is applied to the entire circumference of the ring packing, and it is preferable that the grease is sufficiently adhered particularly inside the concave groove. Accordingly, even if the ring packing repeatedly slides due to vibration of the diaphragm, grease remains in the center of the groove, so that a rapid increase in sliding resistance can be suppressed. Further, it is preferable that the ring packing is made of synthetic rubber and the hardness of the rubber is increased to about A10 (for example, about A80 ± 5) rather than the conventional hardness (for example, about A70 ± 5). Thereby, the deformation amount of the packing surface can be reduced.

本発明は、２系等のガスボンベを切り替えて使用する自動切替機構を備えた圧力調整器に用いることが好適である。   The present invention is preferably used for a pressure regulator equipped with an automatic switching mechanism that switches between two gas cylinders.

すなわち、異なる液化ガス供給源に接続される第１と第２の入力ポートと、該第１と第２の入力ポートにそれぞれ連通された第１と第２の減圧弁と、該第１と第２の減圧弁の減圧側に共通に連通された圧力室と、該圧力室に連通された減圧ガス出口流路と、前記圧力室の一部の室壁を画成するダイヤフラムと、該ダイヤフラムを前記圧力室の圧力に抗して付勢するばね部材と、前記ダイヤフラムに固定された筒状の連動子と、該連動子に気密に挿通され該連動子に回動自在に連結された切替軸と、該切替軸の前記圧力室の外側の軸部を軸方向に摺動自在に支持する筒体と、該筒体の内面に対向する前記切替軸の外周に形成された凹溝内に装着されたリングパッキンと、該切替軸の前記圧力室側の突出部に設けられ円板状の面の一部を凸状にしたカム面を有する切替カムと、該カム面に対向させて位置をずらして配設され前記第１と第２の減圧弁を開閉する第１と第２の弁棒を備えてなる圧力調整器において、前記切替軸の外周に装着されたリングパッキンは、断面が長円形に形成され、前記筒体の内面に対向する面に周方向に沿って凹溝が形成されてなることを特徴とする。   That is, first and second input ports connected to different liquefied gas supply sources, first and second pressure reducing valves respectively connected to the first and second input ports, and the first and second A pressure chamber connected in common to the pressure reducing side of the pressure reducing valve, a pressure reducing gas outlet channel connected to the pressure chamber, a diaphragm defining a part of a wall of the pressure chamber, and the diaphragm A spring member that urges against the pressure in the pressure chamber, a cylindrical interlock fixed to the diaphragm, and a switching shaft that is hermetically inserted into the interlock and is rotatably connected to the interlock. And a cylindrical body that slidably supports a shaft portion outside the pressure chamber of the switching shaft in an axial direction, and a recess formed in an outer periphery of the switching shaft facing the inner surface of the cylindrical body A ring-shaped packing, and a part of the disk-shaped surface provided on the pressure chamber-side protruding portion of the switching shaft is convex. In a pressure regulator comprising a switching cam having a cam surface, and first and second valve rods disposed opposite to each other to be opposed to the cam surface and opening and closing the first and second pressure reducing valves The ring packing mounted on the outer periphery of the switching shaft has an oval cross section, and a groove facing the inner surface of the cylindrical body is formed along the circumferential direction.

この場合において、前記切替軸と前記切替カムは、樹脂で一体形成され、前記連動子は、樹脂で形成され、該連動子の端部に形成されたツメ部を前記切替軸の外周面に形成された周方向溝に係止して回動自在に前記切替軸を保持する構成とすることが好ましい。また、上述したように、リングパッキンは、合成ゴムで形成し、凹溝を含む部分にグリースを塗布すること、さらにゴムの硬度を従来よりもＡ１０程度上昇させることが好ましい。   In this case, the switching shaft and the switching cam are integrally formed of resin, the interlock is formed of resin, and a claw portion formed at an end of the interlock is formed on the outer peripheral surface of the switching shaft. It is preferable that the switching shaft is held in the circumferential groove so as to be rotatable. Further, as described above, the ring packing is preferably made of synthetic rubber, and it is preferable to apply grease to the portion including the concave groove and to further increase the hardness of the rubber by about A10 as compared with the conventional case.

本発明によれば、圧力調整器のダイヤフラム等の振動を抑制して異音の発生を抑えることができ、かつ耐久性を向上させることができる。   ADVANTAGE OF THE INVENTION According to this invention, vibration of the diaphragm of a pressure regulator etc. can be suppressed, generation | occurrence | production of abnormal noise can be suppressed, and durability can be improved.

以下、本発明を実施形態に基づいて説明する。図１は、本発明の圧力調整器の一実施形態の断面図である。本実施形態は、２系等のガスボンベを切り替えて使用する自動切替機構を備えた圧力調整器に適用した例であるが、図１では中圧減圧部の断面のみを示している。つまり、本実施形態の圧力調整器は、特許文献１、２に記載された圧力調整器と同様に、中圧減圧部の他に低圧減圧部が同一のボディに一体化して組み付けられているが、図示及び説明を簡単化するため、中圧減圧部についてのみ説明する。   Hereinafter, the present invention will be described based on embodiments. FIG. 1 is a cross-sectional view of an embodiment of the pressure regulator of the present invention. Although this embodiment is an example applied to a pressure regulator provided with an automatic switching mechanism that switches and uses a gas cylinder such as a 2-system, FIG. 1 shows only a cross section of the intermediate pressure reducing unit. That is, the pressure regulator according to the present embodiment has the low-pressure decompression unit integrated with the same body in addition to the intermediate-pressure decompression unit, similarly to the pressure regulators described in Patent Documents 1 and 2. In order to simplify the illustration and description, only the intermediate pressure reducing section will be described.

図１に示すように、中圧減圧部１は、ボディ２とカバー３により気密に形成され、ボディ２に第１の流入ポート４ａと第２の流入ポート４ｂが形成されている。流入ポート４ａ、４ｂには、それぞれ図示していない異なるガスボンベ系統が接続されるようになっている。流入ポート４ａ、４ｂは、第１の減圧弁５ａと第２の減圧弁５ｂの高圧室６ａ、６ｂにそれぞれ連通されている。   As shown in FIG. 1, the intermediate pressure reducing unit 1 is formed airtight by a body 2 and a cover 3, and a first inflow port 4 a and a second inflow port 4 b are formed in the body 2. Different gas cylinder systems (not shown) are connected to the inflow ports 4a and 4b, respectively. The inflow ports 4a and 4b are communicated with the high pressure chambers 6a and 6b of the first pressure reducing valve 5a and the second pressure reducing valve 5b, respectively.

減圧弁５ａ、５ｂは、弁座を有する弁本体７ａ、７ｂと、弁本体７ａ、７ｂの弁座に接離可能に設けられた弁体８ａ、８ｂと、弁体８ａ、８ｂを弁座方向に付勢するコイルスプリング９ａ、９ｂと、弁体８ａ、８ｂに連結された弁棒１０ａ、１０ｂを有して形成され、弁棒１０ａ、１０ｂは弁本体７ａ、７ｂに形成された貫通孔に挿通されて中圧室１１内に突き出して設けられている。弁本体７ａ、７ｂは、高圧側を高圧室６ａ、６ｂに臨ませて気密にボディ２に装着されている。弁本体７ａ、７ｂの減圧側には、中圧室１１を画成する仕切板１２が設けられ、弁棒１０ａ、１０ｂは仕切板１２を貫通して、軸方向に移動可能に設けられている。中圧室１１は、図示していない減圧ガス流路を介して、図示していない低圧減圧部に連通されている。   The pressure reducing valves 5a and 5b include valve bodies 7a and 7b having valve seats, valve bodies 8a and 8b provided to be able to contact and separate from the valve seats of the valve bodies 7a and 7b, and valve bodies 8a and 8b in the valve seat direction. Coil springs 9a and 9b, and valve rods 10a and 10b connected to the valve bodies 8a and 8b. The valve rods 10a and 10b are formed in through holes formed in the valve bodies 7a and 7b. It is inserted and protrudes into the intermediate pressure chamber 11. The valve bodies 7a and 7b are attached to the body 2 in an airtight manner with the high pressure side facing the high pressure chambers 6a and 6b. A partition plate 12 that defines an intermediate pressure chamber 11 is provided on the pressure reducing side of the valve bodies 7a and 7b, and the valve rods 10a and 10b are provided so as to be movable in the axial direction through the partition plate 12. . The intermediate pressure chamber 11 communicates with a low-pressure decompression unit (not shown) via a decompression gas channel (not shown).

中圧室１１の一部の室壁を画成するダイヤフラム１３は、仕切板１２に対向する位置に設けられ、周辺部をボディ２とカバー３に挟持されている。ダイヤフラム１３は、一端がカバー３に当接されたコイルスプリング１４により中圧室１１の圧力に抗して仕切板１２側に付勢されている。   A diaphragm 13 that defines a part of the chamber wall of the intermediate pressure chamber 11 is provided at a position facing the partition plate 12, and a peripheral portion is sandwiched between the body 2 and the cover 3. The diaphragm 13 is urged toward the partition plate 12 against the pressure of the intermediate pressure chamber 11 by a coil spring 14 having one end abutted against the cover 3.

ダイヤフラム１３には、中心部を貫通して筒状の連動子１５が固定されている。連動子１５の筒孔内に円柱状の切替軸１６が挿入して設けられ、連動子１５の筒端に形成されたツメ部１５ａが切替軸１６の外周に形成された溝部１６ａに係止されている。これにより、切替軸１６は、連動子１５に対して回動自由に支持され、かつ、軸方向に位置が拘束されている。   A cylindrical interlock member 15 is fixed to the diaphragm 13 through the center portion. A cylindrical switching shaft 16 is inserted into the cylindrical hole of the interlock member 15, and a claw portion 15 a formed on the cylindrical end of the interlock member 15 is locked to a groove portion 16 a formed on the outer periphery of the switching shaft 16. ing. Thereby, the switching shaft 16 is supported so as to freely rotate with respect to the interlock member 15, and the position thereof is restricted in the axial direction.

中圧室１１に突出した切替軸１６の先端部は、仕切板１２に形成された孔に回転可能に軸支されている。また、切替軸１６の突出部には、円板状の切替カム１７が設けられている。切替カム１７は、円板に周縁部の下面の一部に凸部１７ａを形成したカム面を有している。凸部１７ａの周方向端部は、緩やかな傾斜面を介して円板面移行するように形成されている。弁体８ａ、８ｂに連結された弁棒１０ａ、１０ｂの先端は、切替カム１７のカム面の回転方向の対称位置に当接可能に設けられている。   A tip end portion of the switching shaft 16 protruding into the intermediate pressure chamber 11 is rotatably supported by a hole formed in the partition plate 12. Further, a disc-shaped switching cam 17 is provided on the protruding portion of the switching shaft 16. The switching cam 17 has a cam surface in which a convex portion 17a is formed on a part of the lower surface of the peripheral portion of the disc. The circumferential end of the convex portion 17a is formed so as to shift to the disk surface via a gently inclined surface. The tips of the valve rods 10a and 10b connected to the valve bodies 8a and 8b are provided so as to be able to contact the symmetrical position of the cam surface of the switching cam 17 in the rotational direction.

一方、切替軸１６の上部は、筒状の支持部材２０の筒孔に挿通されている。支持部材２０は、カバー３に形成された筒状の支持部２１に装着され、下端に形成されたツメ部２０ａを支持部２１の下端に係止して固定されている。支持部材２０には、装着時にツメ部２０ａが変形しやすいように切り込み２０ｂが形成されている。   On the other hand, the upper part of the switching shaft 16 is inserted into the cylindrical hole of the cylindrical support member 20. The support member 20 is attached to a cylindrical support portion 21 formed on the cover 3, and a claw portion 20 a formed at the lower end is locked to the lower end of the support portion 21 and fixed. The support member 20 is formed with a cut 20b so that the claw portion 20a is easily deformed when mounted.

また、切替軸１６の上端には、切替状態を示す表示部２２が取り付けられ、この表示部２２は、切替レバー２３の頂部に設けられたのぞき窓２４を透して確認できるようになっている。切替レバー２３は、図示していないが、切替軸１６に係合して設けられ、切替レバー２３を１８０度回転することにより、切替カム１７を１８０度回転可能に形成されている。   Further, a display unit 22 indicating the switching state is attached to the upper end of the switching shaft 16, and this display unit 22 can be confirmed through a peep window 24 provided at the top of the switching lever 23. . Although not shown, the switching lever 23 is provided so as to engage with the switching shaft 16, and the switching cam 17 can be rotated 180 degrees by rotating the switching lever 23 by 180 degrees.

次に、本実施形態の特徴部について、図１〜図３を参照して説明する。支持部材２０の筒孔内に位置する切替軸１６の外周面に凹溝１６ｂが周方向に沿って形成され、その凹溝１６ｂ内にリングパッキン２５が装着されている。リングパッキン２５は、図示のように、合成ゴムを用いて断面が長円形に形成され、支持部材２０の筒孔に対向する面に凹溝２５ａが周方向に形成されている。そして、リングパッキン２５の全体にグリースを塗布して支持部材２０の筒孔に挿入する。また、支持部材２０の筒孔に対向する面の摺動方向の端部は、大きな曲率に形成されている。また、ゴム硬度は、従来よりもＡ１０程度高いものが用いられている。   Next, the characteristic part of this embodiment is demonstrated with reference to FIGS. A concave groove 16b is formed along the circumferential direction on the outer peripheral surface of the switching shaft 16 located in the cylindrical hole of the support member 20, and a ring packing 25 is mounted in the concave groove 16b. As shown in the figure, the ring packing 25 is formed in an oval cross section using synthetic rubber, and a groove 25a is formed in the circumferential direction on the surface of the support member 20 facing the cylindrical hole. Then, grease is applied to the entire ring packing 25 and inserted into the cylindrical hole of the support member 20. Moreover, the edge part of the sliding direction of the surface facing the cylinder hole of the supporting member 20 is formed in the big curvature. The rubber hardness is higher by about A10 than before.

このように構成される本実施形態の圧力調整器の動作について説明する。切替カム１７が図１の位置にあるときは、第１の流入ポート４ａに連結されたガスボンベ系統からＬＰＧが供給されるようになっている。つまり、中圧室１１の圧力が設定圧よりも低いときは、ダイヤフラム１３が図において下方に変位し、これによって切替カム１７のカム面の凸部１７ａに当接している弁棒１０ａが下方に押し下げられる。これにより、第１の減圧弁５ａの弁体８ａが弁座から離れて第１の流入ポート４ａからＬＰＧが導入され、中圧室１１の圧力が上昇してダイヤフラム１３が図において上方に変位する。中圧室１１の圧力が設定圧に達すると、弁体８ａが弁座に当接してＬＰＧの導入が停止する。このようにして、中圧室１１に連通する低圧減圧部から使用先へのＬＰＧの供給量に応じて第１の減圧弁５ａが開閉され、中圧室１１の圧力が設定圧に保持される。   The operation of the pressure regulator of this embodiment configured as described above will be described. When the switching cam 17 is in the position shown in FIG. 1, LPG is supplied from the gas cylinder system connected to the first inflow port 4a. That is, when the pressure in the intermediate pressure chamber 11 is lower than the set pressure, the diaphragm 13 is displaced downward in the figure, and the valve rod 10a that is in contact with the convex portion 17a of the cam surface of the switching cam 17 is thereby lowered. Pushed down. As a result, the valve body 8a of the first pressure reducing valve 5a is separated from the valve seat, LPG is introduced from the first inflow port 4a, the pressure in the intermediate pressure chamber 11 rises, and the diaphragm 13 is displaced upward in the figure. . When the pressure in the intermediate pressure chamber 11 reaches the set pressure, the valve body 8a comes into contact with the valve seat and the introduction of LPG is stopped. In this way, the first pressure reducing valve 5a is opened / closed according to the amount of LPG supplied from the low pressure reducing portion communicating with the intermediate pressure chamber 11 to the user, and the pressure in the intermediate pressure chamber 11 is maintained at the set pressure. .

第１の流入ポート４ａに連結されたガスボンベ系統が空に近くなると、第１の減圧弁５ａを開いても中圧室１１の圧力を設定圧に保持できなくなり、ダイヤフラム１３がさらに下方に変位する。そして、切替カム１７の凸部１７ａ以外のカム面が弁棒１０ｂに当接する位置まで下方に押し下げられると、第２の減圧弁５ｂの弁体８ｂが弁座から離れ、第２の流入ポート４ｂに接続されたガスボンベ系統に切り替えられて、ＬＰＧが中圧室１１に導かれる。この状態は、のぞき窓２４から表示部２２の表示（例えば、赤表示）を見ることで確認できる。   When the gas cylinder system connected to the first inflow port 4a becomes nearly empty, the pressure in the intermediate pressure chamber 11 cannot be maintained at the set pressure even when the first pressure reducing valve 5a is opened, and the diaphragm 13 is further displaced downward. . When the cam surface other than the convex portion 17a of the switching cam 17 is pushed down to a position where it contacts the valve rod 10b, the valve body 8b of the second pressure reducing valve 5b is separated from the valve seat, and the second inflow port 4b. The LPG is guided to the intermediate pressure chamber 11 by switching to the gas cylinder system connected to. This state can be confirmed by viewing the display (for example, red display) on the display unit 22 from the observation window 24.

その後、適当な時期に、切替レバー２３を１８０度回転すると、切替カム１７の凸部１７ａが第２の減圧弁５ｂの弁棒１０ｂに当接され、第２の減圧弁５ｂの開閉動作によって中圧室１１の圧力が設定圧に保持される。また、第１の減圧弁５ａは閉じられるから、適宜時期に、第１の流入ポート４ａに接続されたガスボンベ系統を新たなガスボンベに交換することにより、ガスボンベ系統は異なるが初期状態に戻される。   Thereafter, when the switching lever 23 is rotated 180 degrees at an appropriate time, the convex portion 17a of the switching cam 17 is brought into contact with the valve rod 10b of the second pressure reducing valve 5b, and the second pressure reducing valve 5b is opened and closed. The pressure in the pressure chamber 11 is maintained at the set pressure. In addition, since the first pressure reducing valve 5a is closed, by replacing the gas cylinder system connected to the first inflow port 4a with a new gas cylinder at an appropriate time, the gas cylinder system is returned to the initial state although the gas cylinder system is different.

このように、第１又は第２の減圧弁５ａ、ｂの開閉動作に伴い、中圧室１１の圧力変動が生じ、これによりダイヤフラム１３が振動し、これに伴い切替カム１７等の関連部品が振動して異音を発生するおそれがある。この点、本実施形態によれば、切替軸１６に装着されたリングパッキン２５と支持部材２０との摺動摩擦により振動が抑制されるから、異音の発生を抑えることができる。   As described above, the pressure fluctuation of the intermediate pressure chamber 11 is caused by the opening / closing operation of the first or second pressure reducing valve 5a, b, thereby the diaphragm 13 vibrates, and the related parts such as the switching cam 17 are accordingly moved. There is a risk of generating abnormal noise due to vibration. In this respect, according to the present embodiment, since vibration is suppressed by the sliding friction between the ring packing 25 attached to the switching shaft 16 and the support member 20, the occurrence of abnormal noise can be suppressed.

特に、本実施形態によれば、リングパッキン２５の断面を長円形にし、さらにリングパッキン２５の外周面に周方向に沿って凹溝２５ａを形成したことから、２点で支持部材の筒孔内面に接触させることができる。その結果、初期でも一定の摺動抵抗を確保でき、耐久性を向上して摺動抵抗の上昇を抑えることができる。また、リングパッキン２５の断面を長円形にし、図３に示すように、パッキンの摺動方向両端部の曲率を大きくとることにより、摺動方向の反対側にパッキンが引っ張られるのを防止できる。   In particular, according to this embodiment, the ring packing 25 has an oval cross section, and the groove 25a is formed along the circumferential direction on the outer peripheral surface of the ring packing 25. Can be contacted. As a result, a constant sliding resistance can be secured even in the initial stage, durability can be improved, and an increase in sliding resistance can be suppressed. Further, by making the cross-section of the ring packing 25 into an oval shape and increasing the curvature at both ends in the sliding direction of the packing as shown in FIG. 3, it is possible to prevent the packing from being pulled to the opposite side of the sliding direction.

また、リングパッキン２５にグリースを塗布することにより、ダイヤフラム１３の振動によりリングパッキン２５が振動的に摺動を繰り返しても、凹溝２５ａの中央にグリースが残るので、摺動抵抗の急激な上昇を抑えることができる。また、圧力調整器の容量を大きくして切替軸１６の摺動ストロークが長くなっても、耐久性を向上することができる。   Further, by applying grease to the ring packing 25, even if the ring packing 25 repeatedly vibrates due to vibration of the diaphragm 13, the grease remains in the center of the concave groove 25a, so that the sliding resistance increases rapidly. Can be suppressed. Further, even if the capacity of the pressure regulator is increased and the sliding stroke of the switching shaft 16 becomes longer, the durability can be improved.

このように、ダイヤフラム１３に連動して変位する切替軸１６を摺動自由に支持する支持部材２０との間の摺動抵抗を適切に管理できるから、ダイヤフラム１３等の振動を抑制して異音の発生を抑えることができ、かつ耐久性を向上させることができる。また、摺動抵抗を適切に管理できるから、減圧弁の応答速度を適切に管理して、圧力調整器の出口を急に閉じた場合の瞬間閉塞圧力の上昇を抑えることができる。   As described above, since the sliding resistance between the switching shaft 16 that is displaced in conjunction with the diaphragm 13 and the support member 20 that freely slides can be managed appropriately, vibrations of the diaphragm 13 and the like are suppressed and abnormal noise is suppressed. Generation can be suppressed, and durability can be improved. In addition, since the sliding resistance can be appropriately managed, the response speed of the pressure reducing valve can be appropriately managed to suppress an increase in the instantaneous closing pressure when the outlet of the pressure regulator is suddenly closed.

また、リングパッキン２５を合成ゴムで形成し、さらにゴムの硬度を従来の硬度（例えば、Ａ７０±５程度）よりもＡ１０程度（例えば、Ａ８０±５程度）に硬度を上げることにより、パッキン表面の変形量を減少させて、一層、耐久性を向上させることができる。   Further, the ring packing 25 is made of synthetic rubber, and the hardness of the rubber is increased to about A10 (for example, about A80 ± 5) from the conventional hardness (for example, about A70 ± 5). The amount of deformation can be reduced to further improve the durability.

また、切替軸１６と切替カム１７は、アセタール樹脂などの樹脂で一体形成することが好ましい。これにより部品点数を削減して、製作工数を低減できる。また、連動子１５は、アセタール樹脂などの樹脂で形成することにより、連動子１５の端部に形成されたツメ部１５ａを切替軸１６の外周面に形成された周方向溝１６ａに係止して回動自在に切替軸１６を保持する構成とすることが好ましい。これにより、一層部品点数を削減して、製作工数を低減できる。   Further, the switching shaft 16 and the switching cam 17 are preferably formed integrally with a resin such as acetal resin. Thereby, the number of parts can be reduced, and the number of manufacturing steps can be reduced. Further, the interlock 15 is formed of a resin such as acetal resin, so that the claw portion 15a formed at the end of the interlock 15 is locked to the circumferential groove 16a formed on the outer peripheral surface of the switching shaft 16. It is preferable that the switching shaft 16 is held in a rotatable manner. Thereby, the number of parts can be further reduced, and the number of manufacturing steps can be reduced.

また、切替軸１６の摺動ストロークが長くなると支持部材２０のツメ部２０ａへの負担が増大するが、本実施形態によれば、切替軸１６を摺動自由に支持する支持部材２０との間の摺動抵抗を適切に管理できるから、ツメ部２０ａの耐久性の低下を軽減できる。   Further, when the sliding stroke of the switching shaft 16 becomes longer, the burden on the claw portion 20a of the support member 20 increases. However, according to the present embodiment, between the supporting member 20 that supports the switching shaft 16 so as to slide freely. Since the sliding resistance can be appropriately managed, it is possible to reduce the decrease in the durability of the claw portion 20a.

このように構成されることから、本実施形態の圧力調整器によれば、ガスボンベから供給される高圧のＬＰＧを一旦中圧に減圧した後、使用先のガス圧力に応じた低圧に減圧して供給できるとともに、ガスボンベの圧力低下を検知して自動的に他のガスボンベに切り替えて継続してＬＰＧを供給することができる。   With this configuration, according to the pressure regulator of the present embodiment, the high pressure LPG supplied from the gas cylinder is once reduced to an intermediate pressure and then reduced to a low pressure corresponding to the gas pressure at the use destination. While being able to supply, LPG can be continuously supplied by detecting a pressure drop in the gas cylinder and automatically switching to another gas cylinder.

特に、圧力調整器のダイヤフラム等の振動を抑制して異音の発生を抑えることができ、かつ耐久性を向上させることができる。   In particular, it is possible to suppress vibrations such as the diaphragm of the pressure regulator to suppress the generation of abnormal noise, and to improve durability.

なお、本発明は、自動切替機構を備えた上記の実施形態の中圧減圧部に適用されるに限られるものではなく、自動切替機構を備えていない圧力調整器のダイヤフラムの振動を、ダイヤフラムに連結された軸体とその軸体を摺動自在に支持する筒体との間の摺動抵抗により抑制する場合にも適用でき、同様の効果を奏することができる。   Note that the present invention is not limited to being applied to the medium pressure reducing section of the above embodiment provided with an automatic switching mechanism, and diaphragm vibrations of a pressure regulator that does not include an automatic switching mechanism are applied to the diaphragm. The present invention can also be applied to the case where it is suppressed by a sliding resistance between the connected shaft body and the cylindrical body that slidably supports the shaft body, and the same effect can be obtained.

本発明の一実施形態の圧力調整器の中圧減圧部の断面構成図である。It is a section lineblock diagram of an intermediate pressure decompression part of a pressure regulator of one embodiment of the present invention. 切替軸に装着したリングパッキンと支持部材との摺動部の拡大断面図である。It is an expanded sectional view of the sliding part of the ring packing and support member with which the switching shaft was mounted | worn. 本発明の一実施形態のリングパッキンの断面図である。It is sectional drawing of the ring packing of one Embodiment of this invention.

符号の説明Explanation of symbols

１ 中圧減圧部
２ ボディ
３ カバー
４ａ、ｂ 流入ポート
５ａ、ｂ 減圧弁
６ａ、ｂ 高圧室
１０ａ、ｂ 弁棒
１１ 中圧室
１２ 仕切板
１３ ダイヤフラム
１４ コイルスプリング
１５ 連動子
１６ 切替軸
１７ 切替カム
１７ａ 凸部
２０ 支持部材
２３ 切替レバー
２５ リングパッキン
２５ａ 凹溝 DESCRIPTION OF SYMBOLS 1 Medium pressure pressure-reduction part 2 Body 3 Cover 4a, b Inflow port 5a, b Pressure-reducing valve 6a, b High-pressure chamber 10a, b Valve rod 11 Medium pressure chamber 12 Partition plate 13 Diaphragm 14 Coil spring 15 Interlocking element 16 Switching shaft 17 Switching cam 17a Convex part 20 Support member 23 Switching lever 25 Ring packing 25a Concave groove

Claims (5)

液化ガス供給源に接続される入力ポートと、該入力ポートに連通された減圧弁と、該減圧弁の減圧側に連通された圧力室と、該圧力室に連通された減圧ガス出口流路と、前記圧力室の一部の室壁を画成するダイヤフラムと、該ダイヤフラムを前記圧力室の圧力に抗して付勢するばね部材と、前記ダイヤフラムに連結されて軸方向に変位する軸体と、該軸体を軸方向に摺動自在に支持する筒体と、該筒体の内面に対向する前記軸体の外周に形成された凹溝内に装着されたリングパッキンと、前記ダイヤフラムの変位に応じて前記減圧弁を開閉する弁棒を備えてなる圧力調整器において、
前記リングパッキンは、断面が長円形に形成され、前記筒体の内面に対向する面に周方向に沿って延伸する凹溝が形成されてなることを特徴とする圧力調整器。 An input port connected to the liquefied gas supply source, a pressure reducing valve connected to the input port, a pressure chamber connected to the pressure reducing side of the pressure reducing valve, and a pressure reducing gas outlet channel connected to the pressure chamber; A diaphragm defining a part of a wall of the pressure chamber, a spring member that urges the diaphragm against the pressure of the pressure chamber, and a shaft body coupled to the diaphragm and displaced in the axial direction. A cylindrical body that slidably supports the shaft body in the axial direction, a ring packing mounted in a groove formed on the outer periphery of the shaft body facing the inner surface of the cylindrical body, and a displacement of the diaphragm In accordance with the pressure regulator comprising a valve rod for opening and closing the pressure reducing valve,
The ring packing has a cross section formed in an oval shape, and a concave groove extending along a circumferential direction is formed on a surface facing the inner surface of the cylindrical body. 異なる液化ガス供給源に接続される第１と第２の入力ポートと、該第１と第２の入力ポートにそれぞれ連通された第１と第２の減圧弁と、該第１と第２の減圧弁の減圧側に共通に連通された圧力室と、該圧力室に連通された減圧ガス出口流路と、前記圧力室の一部の室壁を画成するダイヤフラムと、該ダイヤフラムを前記圧力室の圧力に抗して付勢するばね部材と、前記ダイヤフラムに固定された筒状の連動子と、該連動子に気密に挿通され該連動子に回動自在に連結された切替軸と、該切替軸の前記圧力室の外側の軸部を軸方向に摺動自在に支持する筒体と、該筒体の内面に対向する前記切替軸の外周に形成された凹溝内に装着されたリングパッキンと、該切替軸の前記圧力室側の突出部に設けられ円板状の面の一部を凸状にしたカム面を有する切替カムと、該カム面に対向させて位置をずらして配設され前記第１と第２の減圧弁を開閉する第１と第２の弁棒を備えてなる圧力調整器において、
前記リングパッキンは、断面が長円形に形成され、前記筒体の内面に対向する面に周方向に沿って延伸する凹溝が形成されてなることを特徴とする圧力調整器。 First and second input ports connected to different liquefied gas supply sources; first and second pressure reducing valves respectively connected to the first and second input ports; and the first and second pressure ports A pressure chamber connected in common to the pressure reducing side of the pressure reducing valve; a pressure reducing gas outlet passage connected to the pressure chamber; a diaphragm defining a part of a wall of the pressure chamber; and A spring member that biases against the pressure of the chamber, a cylindrical interlock fixed to the diaphragm, a switching shaft that is hermetically inserted into the interlock and is rotatably connected to the interlock, A cylindrical body that slidably supports an axial portion of the switching shaft outside the pressure chamber in an axial direction, and a cylindrical groove formed on the outer periphery of the switching shaft facing the inner surface of the cylindrical body. A ring packing and a cam surface provided on a protruding portion of the switching shaft on the pressure chamber side, wherein a part of the disk-shaped surface is convex. A switching cam which, in the first pressure regulator comprising a second valve stem is disposed by shifting the position to face the cam surface to open and close the first and second pressure reducing valve,
The ring packing has a cross section formed in an oval shape, and a concave groove extending along a circumferential direction is formed on a surface facing the inner surface of the cylindrical body. 請求項２に記載の圧力調整器において、
前記切替軸と前記切替カムは、樹脂で一体形成され、
前記連動子は、樹脂で形成され、該連動子の端部に形成されたツメ部を前記切替軸の外周面に形成された周方向溝に係止して回動自在に前記切替軸を保持することを特徴とする圧力調整器。 The pressure regulator according to claim 2,
The switching shaft and the switching cam are integrally formed of resin,
The interlock is formed of resin, and a claw portion formed at an end of the interlock is locked in a circumferential groove formed on the outer peripheral surface of the switching shaft, and the switching shaft is rotatably held. A pressure regulator characterized by: 請求項１又は２に記載の圧力調整器において、
前記リングパッキンは、合成ゴムで形成され、前記凹溝を含む部分にグリースが塗布されてなることを特徴とする圧力調整器。 The pressure regulator according to claim 1 or 2,
The pressure regulator according to claim 1, wherein the ring packing is made of synthetic rubber, and grease is applied to a portion including the concave groove. 請求項１乃至４に記載の圧力調整器において、  The pressure regulator according to claim 1, wherein
前記リングパッキンは、摺動方向の両端部の曲率が摺動方向の前記凹溝の曲率に比べて大きいことを特徴とする圧力調整器。  The ring packing has a larger curvature at both ends in the sliding direction than the curvature of the concave groove in the sliding direction.
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