JP2005214396A

JP2005214396A - Relief valve

Info

Publication number: JP2005214396A
Application number: JP2004025812A
Authority: JP
Inventors: Kiyotaka Kasugai; 清隆春日井; Hiroyuki Kuze; 博幸久世
Original assignee: Toyota Industries Corp; Pacific Industrial Co Ltd
Current assignee: Toyota Industries Corp; Pacific Industrial Co Ltd
Priority date: 2004-02-02
Filing date: 2004-02-02
Publication date: 2005-08-11

Abstract

PROBLEM TO BE SOLVED: To provide a relief valve, sealing high-pressure compressed fluid and having higher reliability than before. SOLUTION: In this relief valve 20, the surface of a tapered recessed part 66 formed of brass 67 is plated with a tin film 68, and a coating material 69 is made to adhere to the tin film 68 to form a sealing part 70, whereby even if a refrigerant (a compressed fluid) becomes high pressure, a tapered projecting part 48 and a tapered recessed part 66 are held in a closely adhering state. That is, as compared with a relief valve using the conventional rubber material, higher-pressure refrigerant can be sealed in the internal space 11 of a compressor 10. In closing the valve, the tapered projecting part 48 and the tapered recessed part 66 are brought into face contact with each other so that the reliability can be heightened more than the conventional relief valve. COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、リリーフバルブに関する。 The present invention relates to a relief valve.

図５に示された従来のリリーフバルブ１は、圧縮流体が通過し得る弁口２に直動部材３を対向配置し、その直動部材３に備えた弁体６を、圧縮コイルバネ４の弾発力によって弁口２の縁部に形成された環状突部５に押し付けた構造になっている。そして、圧縮流体の圧力が所定値以下であった場合には、弁体６が環状突部５に当接して、弁口２を閉塞する一方、圧縮流体の圧力が所定値を超えた場合には、その圧力によって弁体３が押されて環状突部５から離間し、弁口２が開放される（例えば、特許文献１参照）。
特開平９−４７４１号公報（段落［００４２］、第１図） In the conventional relief valve 1 shown in FIG. 5, a linear motion member 3 is disposed opposite to a valve port 2 through which a compressed fluid can pass, and a valve body 6 provided in the linear motion member 3 is placed in an elastic state of the compression coil spring 4. It has a structure in which it is pressed against an annular protrusion 5 formed at the edge of the valve port 2 by the generated force. When the pressure of the compressed fluid is less than or equal to a predetermined value, the valve body 6 comes into contact with the annular protrusion 5 to close the valve port 2 while the pressure of the compressed fluid exceeds a predetermined value. The valve body 3 is pushed by the pressure to be separated from the annular protrusion 5, and the valve port 2 is opened (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 9-4741 (paragraph [0042], FIG. 1)

ところで、従来のリリーフバルブ１において、弁体６をゴム材とした場合には、高圧の圧縮流体を密封することができなかった。また、環状突部５と弁体６とを異なる硬度の金属で形成すると共に環状突部５の先端を尖らせて、弁体６の端面に環状突部５の先端を突き当てたメタルシール構造では、リリーフバルブ１の開閉動作、即ち、弁体６と環状突部５との当接が繰り返されることで、閉弁時における環状突部５と弁体６との密着性が次第に低下するため、信頼性に改善の余地があった。 By the way, in the conventional relief valve 1, when the valve body 6 is made of a rubber material, the high-pressure compressed fluid cannot be sealed. Also, a metal seal structure in which the annular projection 5 and the valve body 6 are formed of metals having different hardnesses, the tip of the annular projection 5 is sharpened, and the tip of the annular projection 5 is abutted against the end surface of the valve body 6. Then, since the opening / closing operation of the relief valve 1, that is, the contact between the valve body 6 and the annular protrusion 5 is repeated, the adhesiveness between the annular protrusion 5 and the valve body 6 when the valve is closed gradually decreases. There was room for improvement in reliability.

本発明は、上記事情に鑑みてなされたもので、高圧の圧縮流体を密封可能でかつ従来よりも信頼性の高いリリーフバルブの提供を目的とする。 The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a relief valve capable of sealing a high-pressure compressed fluid and having higher reliability than before.

上記目的を達成するためになされた請求項１の発明に係るリリーフバルブ（２０，１２０）は、流体収容室（１１）を有した機器（１０）に固定されるハウジング（２１，１２１）と、ハウジング（２１，１２１）に形成されて、流体収容室（１１）に臨んだ弁口（６４）と、ハウジング（２１，１２１）内に収容され、弁口（６４）に向けて直動可能に案内された直動部材（４０，１４０）と、弁口（６４）を開閉するための弁体（４５，１４５）と、直動部材（４０，１４０）の先端部に、弁体（４５，１４５）を傾動可能に連結した弁体連結機構（４１，４７，１４３）と、弁体（４５，１４５）の先端に形成されたテーパー凸部（４８）と、弁口（６４）の開口縁に形成され、テーパー凸部（４８）が押し付けられるテーパー凹部（６６）と、テーパー凸部（４８）又はテーパー凹部（６６）の何れか一方を銅又はアルミニウムの含有部材（６７）で形成しかつその銅又はアルミニウムの含有部材（６７）の表面を錫皮膜（６８）をメッキしてなるシール部（７０）とを備えたところに特徴を有する。 The relief valve (20, 120) according to the invention of claim 1 made to achieve the above object includes a housing (21, 121) fixed to a device (10) having a fluid storage chamber (11), A valve port (64) formed in the housing (21, 121) and facing the fluid storage chamber (11), and accommodated in the housing (21, 121) so as to be directly movable toward the valve port (64) The guided linear motion member (40, 140), the valve body (45, 145) for opening and closing the valve port (64), and the valve body (45, 140) at the tip of the linear motion member (40, 140) 145) in a tiltable manner, a valve body coupling mechanism (41, 47, 143), a tapered protrusion (48) formed at the tip of the valve body (45, 145), and an opening edge of the valve port (64) The taper concave part (48) to which the taper convex part (48) is pressed 6) and either one of the taper convex part (48) or the taper concave part (66) is formed of a copper or aluminum containing member (67), and the surface of the copper or aluminum containing member (67) is a tin film ( 68) and a seal portion (70) formed by plating.

請求項２の発明に係るリリーフバルブ（２０，１２０）は、流体収容室（１１）を有した機器（１０）に固定されるハウジング（２１，１２１）と、ハウジング（２１，１２１）に形成されて、流体収容室（１１）に臨んだ弁口（６４）と、ハウジング（２１，１２１）内に収容され、弁口（６４）に向けて直動可能に案内された直動部材（４０，１４０）と、弁口（６４）を開閉するための弁体（４５，１４５）と、直動部材（４０，１４０）の先端部に、弁体（４５，１４５）を傾動可能に連結するための弁体連結機構（４１，４７，１４３）と、弁体（４５，１４５）の先端に形成されたテーパー凸部（４８）と、弁口（６４）の開口縁に形成され、テーパー凸部（４８）が押し付けられるテーパー凹部（６６）と、テーパー凸部（４８）又はテーパー凹部（６６）の何れか一方にコーティング材（６９）を付着してなるシール部（７０）とを備えたところに特徴を有する。 A relief valve (20, 120) according to the invention of claim 2 is formed in a housing (21, 121) fixed to a device (10) having a fluid storage chamber (11) and a housing (21, 121). The valve port (64) facing the fluid storage chamber (11) and the linear motion member (40, 40) accommodated in the housing (21, 121) and guided so as to be linearly movable toward the valve port (64). 140), the valve body (45, 145) for opening and closing the valve port (64), and the valve body (45, 145) to be tiltably connected to the tip of the linear motion member (40, 140). The valve body coupling mechanism (41, 47, 143), the taper convex part (48) formed at the tip of the valve body (45, 145), and the taper convex part formed at the opening edge of the valve port (64). A tapered recess (66) against which (48) is pressed, and a tapered projection (4 ) Or having characterized in that with the sealing portion formed by adhering either one coating material (69) of the tapered recess (66) and (70).

請求項３の発明に係るリリーフバルブ（２０，１２０）は、流体収容室（１１）を有した機器（１０）に固定されるハウジング（２１，１２１）と、ハウジング（２１，１２１）に形成されて、流体収容室（１１）に臨んだ弁口（６４）と、ハウジング（２１，１２１）内に収容され、弁口（６４）に向けて直動可能に案内された直動部材（４０，１４０）と、弁口（６４）を開閉するための弁体（４５，１４５）と、直動部材（４０，１４０）の先端部に、弁体（４５，１４５）を傾動可能に連結した弁体連結機構（４１，４７，１４３）と、弁体（４５，１４５）の先端に形成されたテーパー凸部（４８）と、弁口（６４）の開口縁に形成され、テーパー凸部（４８）が押し付けられるテーパー凹部（６６）と、テーパー凸部（４８）又はテーパー凹部（６６）の何れか一方を、銅又はアルミニウムの含有部材（６７）で形成しかつその銅又はアルミニウムの含有部材（６７）の表面を錫皮膜（６８）でメッキしさらにその錫皮膜（６８）に重ねてコーティング材（６９）を付着してなるシール部（７０）とを備えたところに特徴を有する。 The relief valve (20, 120) according to the invention of claim 3 is formed on the housing (21, 121) fixed to the device (10) having the fluid storage chamber (11) and the housing (21, 121). The valve port (64) facing the fluid storage chamber (11) and the linear motion member (40, 40) accommodated in the housing (21, 121) and guided so as to be linearly movable toward the valve port (64). 140), a valve body (45, 145) for opening and closing the valve port (64), and a valve body (45, 145) connected to the tip of the linear motion member (40, 140) in a tiltable manner The body connecting mechanism (41, 47, 143), the taper convex part (48) formed at the tip of the valve body (45, 145), and the opening edge of the valve port (64) are formed on the taper convex part (48 ) Are pressed against the tapered recess (66), and the tapered protrusion (48) or Either one of the tapered recesses (66) is formed of a copper or aluminum containing member (67), and the surface of the copper or aluminum containing member (67) is plated with a tin film (68). 68) and a seal portion (70) formed by adhering a coating material (69).

請求項４の発明は、請求項１乃至３の何れかに記載のリリーフバルブ（２０，１２０）において、弁体連結機構（４１，４７，１４３）は、直動部材（４０，１４０）の先端部に設けられた球形凸部（４１，１４３）と、弁体（４５，１４５）に形成されて、球形凸部（４１，１４３）が挿入され、かつ内面が球形凸部（４１，１４３）に対応した丸みを帯びた球形凹部（４７）とからなるところに特徴を有する。 According to a fourth aspect of the present invention, in the relief valve (20, 120) according to any one of the first to third aspects, the valve body connecting mechanism (41, 47, 143) is a tip of the linear motion member (40, 140). Spherical convex portions (41, 143) provided in the portion and the valve body (45, 145) are formed, the spherical convex portions (41, 143) are inserted, and the inner surfaces are spherical convex portions (41, 143). And a rounded spherical recess (47) corresponding to.

［請求項１の発明］
請求項１のリリーフバルブ（２０，１２０）では、弁体（４５，１４５）のテーパー凸部（４８）又はテーパー凸部（４８）が押し付けられるテーパー凹部（６６）の何れか一方を銅又はアルミニウムの含有部材（６７）で形成し、その表面を錫皮膜（６８）をメッキしてなるシール部（７０）が備えられたので、圧縮流体が高圧となった場合でも、テーパー凸部（４８）とテーパー凹部（６６）とが密着状態に保持される。つまり、従来のゴム製の弁体を備えたリリーフバルブに比べて、より高圧の圧縮流体を流体収容室（１１）内に密封することができる。また、閉弁時にはテーパー凸部（４８）とテーパー凹部（６６）とが面当接するので、従来のリリーフバルブのように、弁体の端面に先端が尖った突部を突き当てて閉弁する構造に比べて、リリーフバルブ（２０，１２０）の信頼性を高めることができる。さらに、直動部材（４０，１４０）はハウジング（２１，１２１）によって弁口（６４）に向けて案内されるので、弁口（６４）に対する弁体（４５，１４５）の位置ずれが防止され、確実に弁口（６４）を閉塞することができる。しかも、弁体（４５，１４５）は、直動部材（４０，１４０）に対して傾動可能なので、弁体（４５，１４５）やテーパー凹部（６６）の形状のばらつきが吸収され、弁口（６４）に対する弁体（４５，１４５）の位置ずれが防止される。 [Invention of Claim 1]
In the relief valve (20, 120) according to claim 1, either one of the taper convex part (48) of the valve body (45, 145) or the taper concave part (66) to which the taper convex part (48) is pressed is made of copper or aluminum. Since the sealing part (70) formed by plating the tin film (68) is provided on the surface thereof, the taper convex part (48) is formed even when the compressed fluid becomes high pressure. And the tapered recess (66) are held in close contact with each other. That is, compared with the relief valve provided with the conventional rubber valve body, a higher-pressure compressed fluid can be sealed in the fluid storage chamber (11). Further, when the valve is closed, the taper convex portion (48) and the taper concave portion (66) are in surface contact with each other, so that a protruding portion having a sharp tip is brought into contact with the end face of the valve body to close the valve as in the case of a conventional relief valve. Compared with the structure, the reliability of the relief valve (20, 120) can be increased. Further, since the linear motion members (40, 140) are guided toward the valve port (64) by the housing (21, 121), the displacement of the valve body (45, 145) with respect to the valve port (64) is prevented. The valve port (64) can be reliably closed. In addition, since the valve body (45, 145) can tilt with respect to the linear motion member (40, 140), variations in the shape of the valve body (45, 145) and the tapered recess (66) are absorbed, and the valve port ( 64) is prevented from being displaced with respect to the valve body (45, 145).

[請求項２の発明]
請求項２の発明のリリーフバルブ（２０，１２０）では、弁体（４５，１４５）のテーパー凸部（４８）又はテーパー凸部（４８）が押し付けられるテーパー凹部（６６）の何れか一方にコーティング材（６９）を付着してなるシール部（７０）が備えられたので、圧縮流体が高圧となった場合でも、テーパー凸部（４８）とテーパー凹部（６６）との密着状態が保持される。つまり、従来のゴム製の弁体を備えたリリーフバルブに比べて、より高圧の圧縮流体を流体収容室（１１）内に密封することができる。また、閉弁時にはテーパー凸部（４８）とテーパー凹部（６６）とが面当接するので、従来のリリーフバルブのように、弁体の端面に先端が尖った突部を突き当てて閉弁する構造に比べて、リリーフバルブ（２０，１２０）の信頼性を高めることができる。更に、直動部材（４０，１４０）はハウジング（２１，１２１）によって弁口（６４）に向けて案内されるので、弁口（６４）に対する弁体（４５，１４５）の位置ずれが防止され、確実に弁口（６４）を閉塞することができる。しかも、弁体（４５，１４５）は、直動部材（４０，１４０）に対して傾動可能なので、弁体（４５，１４５）やテーパー凹部（６６）の形状のばらつきが吸収され、弁口（６４）に対する弁体（４５，１４５）の位置ずれが防止される。 [Invention of Claim 2]
In the relief valve (20, 120) of the invention of claim 2, either one of the taper convex part (48) of the valve body (45, 145) or the taper concave part (66) to which the taper convex part (48) is pressed is coated. Since the seal portion (70) formed by adhering the material (69) is provided, even when the compressed fluid has a high pressure, the close contact state between the tapered convex portion (48) and the tapered concave portion (66) is maintained. . That is, compared with the relief valve provided with the conventional rubber valve body, a higher-pressure compressed fluid can be sealed in the fluid storage chamber (11). Further, when the valve is closed, the taper convex portion (48) and the taper concave portion (66) are in surface contact with each other, so that a protruding portion having a sharp tip is brought into contact with the end face of the valve body to close the valve as in the case of a conventional relief valve. Compared with the structure, the reliability of the relief valve (20, 120) can be increased. Further, since the linear motion members (40, 140) are guided toward the valve port (64) by the housing (21, 121), the displacement of the valve body (45, 145) with respect to the valve port (64) is prevented. The valve port (64) can be reliably closed. In addition, since the valve body (45, 145) can tilt with respect to the linear motion member (40, 140), variations in the shape of the valve body (45, 145) and the tapered recess (66) are absorbed, and the valve port ( 64) is prevented from being displaced with respect to the valve body (45, 145).

［請求項３の発明］
請求項３の発明のリリーフバルブ（２０，１２０）では、弁体（４５，１４５）のテーパー凸部（４８）又はテーパー凸部（４８）が押し付けられるテーパー凹部（６６）の何れか一方を銅又はアルミニウムの含有部材（６７）で形成し、その表面に錫皮膜（６８）をメッキし、さらに重ねてコーティング材（６９）を付着してなるシール部（７０）が備えられたので、圧縮流体が高圧となった場合でも、テーパー凸部（４８）とテーパー凹部（６６）との密着状態が保持される。つまり、従来のゴム製の弁体を備えたリリーフバルブに比べて、より高圧の圧縮流体を流体収容室（１１）内に密封することができる。また、閉弁時にはテーパー凸部（４８）とテーパー凹部（６６）とが面当接するので、従来のリリーフバルブのように、弁体の端面に先端が尖った突部を突き当てて閉弁する構造に比べて、リリーフバルブ（２０，１２０）の信頼性を高めることができる。更に、直動部材（４０，１４０）はハウジング（２１，１２１）によって弁口（６４）に向けて案内されるので、弁口（６４）に対する弁体（４５，１４５）の位置ずれが防止され、確実に弁口（６４）を閉塞することができる。しかも、弁体（４５，１４５）は、直動部材（４０，１４０）に対して傾動可能なので、弁体（４５，１４５）やテーパー凹部（６６）の形状のばらつきが吸収され、弁口（６４）に対する弁体（４５，１４５）の位置ずれが防止される。 [Invention of claim 3]
In the relief valve (20, 120) of the invention of claim 3, either one of the taper convex portion (48) of the valve body (45, 145) or the taper concave portion (66) to which the taper convex portion (48) is pressed is made of copper. Alternatively, since the seal member (70) is formed of the aluminum containing member (67), the surface thereof is plated with the tin film (68), and further coated with the coating material (69), the compressed fluid is provided. Even when the pressure becomes high, the contact state between the tapered convex portion (48) and the tapered concave portion (66) is maintained. That is, compared with the relief valve provided with the conventional rubber valve body, a higher-pressure compressed fluid can be sealed in the fluid storage chamber (11). Further, when the valve is closed, the taper convex portion (48) and the taper concave portion (66) are in surface contact with each other, so that a protruding portion having a sharp tip is brought into contact with the end face of the valve body to close the valve as in the case of a conventional relief valve. Compared with the structure, the reliability of the relief valve (20, 120) can be increased. Further, since the linear motion members (40, 140) are guided toward the valve port (64) by the housing (21, 121), the displacement of the valve body (45, 145) with respect to the valve port (64) is prevented. The valve port (64) can be reliably closed. In addition, since the valve body (45, 145) can tilt with respect to the linear motion member (40, 140), variations in the shape of the valve body (45, 145) and the tapered recess (66) are absorbed, and the valve port ( 64) is prevented from being displaced with respect to the valve body (45, 145).

［請求項４の発明］
請求項４のリリーフバルブ（２０，１２０）では、直動部材（４０，１４０）に備えられた球形凸部（４１，１４３）と球形凸部（４１，１４３）に対応した球形凹部（４７）とが摺接するので、弁体（４５，１４５）を直動部材（４０，１４０）に対して容易に傾動及び回転させることができる。 [Invention of claim 4]
In the relief valve (20, 120) according to claim 4, the spherical concave portion (47) corresponding to the spherical convex portion (41, 143) and the spherical convex portion (41, 143) provided in the linear motion member (40, 140). And the valve body (45, 145) can be easily tilted and rotated with respect to the linear motion member (40, 140).

［第１実施形態］
以下、本発明の第１実施形態を図１〜図３に基づいて説明する。
図１において符合１０は、エアコンに備えられたコンプレッサであって、本発明における「機器」に相当する。このコンプレッサ１０の内部空間１１には、冷媒（例えば二酸化炭素）が圧縮流体として充填されており、コンプレッサ１０の駆動により内部空間１１の圧縮流体の圧力が変動する。そして、圧縮流体の圧力が基準値より大きくなったときに、その圧縮流体をコンプレッサ１０の外側に解放するために本発明に係るリリーフバルブ２０が用いられている。なお、コンプレッサ１０の内部空間１１は、本発明における「流体収容室」に相当する。 [First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
In FIG. 1, reference numeral 10 is a compressor provided in the air conditioner, and corresponds to the “device” in the present invention. The internal space 11 of the compressor 10 is filled with a refrigerant (for example, carbon dioxide) as a compressed fluid, and the pressure of the compressed fluid in the internal space 11 varies as the compressor 10 is driven. The relief valve 20 according to the present invention is used to release the compressed fluid to the outside of the compressor 10 when the pressure of the compressed fluid becomes larger than a reference value. The internal space 11 of the compressor 10 corresponds to the “fluid storage chamber” in the present invention.

リリーフバルブ２０は、図１の上下方向に延びた軸状のハウジング２１を備えている。ハウジング２１は、全体として、例えば平断面が六角形の角柱部２２の一端からその角柱部２２より細い雄螺子部２３を延設した構造をなしている。そして、コンプレッサ１０に形成されたネジ孔１２に、ハウジング２１の雄螺子部２３が螺合固定されている。 The relief valve 20 includes a shaft-shaped housing 21 extending in the vertical direction in FIG. The housing 21 as a whole has a structure in which, for example, a male screw portion 23 that is thinner than the rectangular column portion 22 is extended from one end of a rectangular column portion 22 having a hexagonal cross section. The male screw portion 23 of the housing 21 is screwed and fixed to the screw hole 12 formed in the compressor 10.

ハウジング２１の軸心部には、内部空間１１側から順に、弁収容室２５と外側開放孔２７とが形成されている。弁収容室２５には、本発明に係る直動部材４０が収容されかつ、先端詰栓６０にて抜け止めされている。 A valve housing chamber 25 and an outer opening hole 27 are formed in the axial center portion of the housing 21 in order from the inner space 11 side. In the valve storage chamber 25, the linear motion member 40 according to the present invention is stored, and is prevented from coming off by a tip plug 60.

直動部材４０は、先端部に向かって段付き状に縮径した円柱状をなしている。直動部材４０のうち大径部４０Ａは、弁収容室２５の内周面に摺接している。また、大径部４０Ａの一端からは小径部４０Ｂが延設され、小径部４０Ｂの先端部には、半球状の球形凸部４１が設けられている。 The linear motion member 40 has a cylindrical shape with a stepped diameter toward the tip. The large diameter portion 40 A of the linear motion member 40 is in sliding contact with the inner peripheral surface of the valve storage chamber 25. A small-diameter portion 40B extends from one end of the large-diameter portion 40A, and a hemispherical spherical convex portion 41 is provided at the tip of the small-diameter portion 40B.

直動部材４０の軸心部には、通気孔４３が形成されている。通気孔４３は、直動部材４０における大径部４０Ａの端面に開放しかつ、直動部材４０の軸方向の途中部分まで延びている。そして、通気孔４３の奥部には、直動部材４０の小径部４０Ｂを側方向から貫通した側部貫通孔４４が形成されている。そして、これら通気孔４３と側部貫通孔４４とが、弁収容室２５に常時連通した状態になっている。 A vent hole 43 is formed in the axial center portion of the linear motion member 40. The vent hole 43 is open to the end face of the large diameter portion 40A of the linear motion member 40 and extends to the middle portion of the linear motion member 40 in the axial direction. And in the back part of the vent hole 43, the side part through-hole 44 which penetrated the small diameter part 40B of the linear motion member 40 from the side direction is formed. The vent holes 43 and the side through holes 44 are always in communication with the valve storage chamber 25.

直動部材４０の先端部には、弁体４５が連結されている。弁体４５は、略円錐形状をなし、基端部には、直動部材４０（より詳細には、小径部４０Ｂ）の先端部が突入した陥没部４６が形成されている。陥没部４６の底面には、直動部材４０の球形凸部４１に対応して丸みを帯びた球形凹部４７が設けられている。この球形凹部４７に直動部材４０の球形凸部４１が受容され、球形凹部４７と球形凸部４１とが摺接可能となっている。ここで、球形凹部４７の内面の半径は、球形凸部４１の外面の半径よりも大きくなっているので、弁体４５が直動部材４０に対して容易に傾動及び回転することが可能となっている。また、図１に示すように、直動部材４０の先端部が弁体４５の陥没部４６に突入した状態では、陥没部４６の側壁４６Ａが、直動部材４０の側部貫通孔４４よりも先端側に位置するので、側部貫通孔４４が弁体４５によって塞がれることはない。なお、球形凹部４７と球形凸部４１とが、本発明における「弁体連結機構」に相当する。 A valve body 45 is connected to the distal end portion of the linear motion member 40. The valve body 45 has a substantially conical shape, and a recessed portion 46 into which the distal end portion of the linear motion member 40 (more specifically, the small diameter portion 40B) protrudes is formed at the base end portion. On the bottom surface of the depressed portion 46, a rounded concave portion 47 corresponding to the spherical convex portion 41 of the linear motion member 40 is provided. The spherical concave portion 47 of the linear motion member 40 is received in the spherical concave portion 47 so that the spherical concave portion 47 and the spherical convex portion 41 can be in sliding contact with each other. Here, since the radius of the inner surface of the spherical concave portion 47 is larger than the radius of the outer surface of the spherical convex portion 41, the valve body 45 can easily tilt and rotate with respect to the linear motion member 40. ing. In addition, as shown in FIG. 1, in the state where the tip of the linear motion member 40 has entered the recess 46 of the valve body 45, the side wall 46 A of the recess 46 is more than the side through hole 44 of the linear motion member 40. Since it is located on the distal end side, the side through hole 44 is not blocked by the valve body 45. The spherical concave portion 47 and the spherical convex portion 41 correspond to the “valve element coupling mechanism” in the present invention.

弁体４５のうち、側壁４６Ａよりも先端側の部分には、先細り形状のテーパー凸部４８が形成されている。詳細には、テーパー凸部４８の途中部分には、段差部４８Ｂが形成され、この段差部４８Ｂよりも基端側に第１テーパー部４８Ａが形成され、段差部４８Ｂよりも先端側に第２テーパー部４８Ｃが形成されている。 A tapered convex portion 48 having a tapered shape is formed in a portion of the valve body 45 on the tip side of the side wall 46A. Specifically, a stepped portion 48B is formed in the middle portion of the taper convex portion 48, a first tapered portion 48A is formed on the proximal end side with respect to the stepped portion 48B, and a second taper side is formed on the distal end side with respect to the stepped portion 48B. A tapered portion 48C is formed.

一方、外側開放孔２７は、ハウジング２１の一端面に開口しており、内部に基端詰栓５０が収容されている。基端詰栓５０は、円筒形状をなし、外周面には雄螺子部５０Ａが形成されている。基端詰栓５０の雄螺子部５０Ａは、外側開放孔２７の内周面に形成された雌螺子部２７Ａに螺合されている。また、外側開放孔２７の内部空間は、基端詰栓５０の軸心部に形成された貫通孔５１を通り、直動部材４０の通気孔４３に連通している。 On the other hand, the outer opening hole 27 is opened at one end surface of the housing 21, and the proximal plug 50 is accommodated therein. The proximal plug 50 has a cylindrical shape, and a male screw portion 50A is formed on the outer peripheral surface. The male screw portion 50 A of the proximal plug 50 is screwed into a female screw portion 27 A formed on the inner peripheral surface of the outer opening hole 27. Further, the internal space of the outer open hole 27 passes through the through hole 51 formed in the axial center portion of the proximal plug 50 and communicates with the vent hole 43 of the linear motion member 40.

直動部材４０の通気孔４３と基端詰栓５０の貫通孔５１とは、互いに接近した側の内径が段付き状に大きくなっている。そして、直動部材４０の通気孔４３における段付き部４３Ｄと、基端詰栓５０の貫通孔５１における段付き部５１Ｄとの間に圧縮コイルバネ５４が突っ張り状態に収められ、この圧縮コイルバネ５４の弾発力により直動部材４０がコンプレッサ１０側に付勢されて、弁体４５が後述する先端詰栓６０に押し付けられている。また、直動部材４０と基端詰栓５０の互いに対向した端部同士が当接可能に構成することで、直動部材４０の外側開放孔２７側への直動範囲が規制されている。 The vent hole 43 of the linear motion member 40 and the through hole 51 of the proximal plug 50 have a stepped inner diameter that is closer to each other. The compression coil spring 54 is stretched between the stepped portion 43D in the vent hole 43 of the linear motion member 40 and the stepped portion 51D in the through hole 51 of the proximal plug 50, and the compression coil spring 54 is elastic. The linear motion member 40 is biased toward the compressor 10 by the generated force, and the valve body 45 is pressed against the tip plug 60 described later. Moreover, the linear movement range to the outer side open hole 27 side of the linear motion member 40 is controlled by the structure which can contact | abut the mutually opposing edge parts of the linear motion member 40 and the base end plug 50. FIG.

なお、貫通孔５１の開口部は、断面六角形の工具孔５２になっており、この工具孔５２に六角レンチを挿入し、基端詰栓５０を螺合操作して、圧縮コイルバネ５４による弾発力を調整することができる。ここで、基端詰栓５０の螺合操作時に、直動部材４０が共回りした場合でも、直動部材４０の球形凸部４１が弁体４５の球形凹部４７に摺接するので、弁体４５が回動することはない。つまり、弁体４５が先端詰栓６０に押し付けられた状態で回動することが防止されるので、弁体４５と先端詰栓６０との接触部分に傷がつくことが防止される。 Note that the opening of the through hole 51 is a tool hole 52 having a hexagonal cross section. A hexagon wrench is inserted into the tool hole 52 and the proximal plug 50 is screwed so The power can be adjusted. Here, even when the linear motion member 40 rotates together during the screwing operation of the proximal plug 50, the spherical convex portion 41 of the linear motion member 40 comes into sliding contact with the spherical concave portion 47 of the valve body 45, so that the valve body 45 is It does not rotate. That is, since the valve body 45 is prevented from rotating while being pressed against the tip plug 60, the contact portion between the valve body 45 and the tip plug 60 is prevented from being damaged.

さて、ハウジング２１の雄螺子部２３側の端部には、先端詰栓６０が組付けられている。先端詰栓６０は、円筒部６１の一端から側方にフランジ６２を張り出した構造になっている。そして、円筒部６１が弁収容室２５内に圧入されかつフランジ６２がハウジング２１の開口縁に突き当てられている。また、先端詰栓６０の貫通孔６３を通して、弁収容室２５内がコンプレッサ１０の内部空間１１と連通した状態になっている。なお、ハウジング２１に先端詰栓６０が圧入によって組付けられている。 Now, a tip plug 60 is attached to the end of the housing 21 on the male screw portion 23 side. The tip plug 60 has a structure in which a flange 62 projects from one end of the cylindrical portion 61 to the side. The cylindrical portion 61 is press-fitted into the valve accommodating chamber 25 and the flange 62 is abutted against the opening edge of the housing 21. Further, the inside of the valve housing chamber 25 is in communication with the internal space 11 of the compressor 10 through the through hole 63 of the tip plug 60. A tip plug 60 is assembled to the housing 21 by press fitting.

先端詰栓６０の貫通孔６３のうち、コンプレッサ１０の内側空間１１に臨んだ開口縁は、内部空間１１に向かってテーパー状に拡径している。一方、貫通孔６３の弁収容室２５側に臨んだ弁口６４の開口縁には、テーパー凹部６６が形成されている。テーパー凹部６６は、弁口６４から円筒部６１の端部に向かってすり鉢状に拡径している。そして、先端詰栓６０は、本発明の「銅の含有部材」に相当する黄銅６７で形成され、先端詰栓６０のうち、テーパー凹部６６には、図２に示すように黄銅６７の表面を錫皮膜６８をメッキし、その錫皮膜６８に重ねてコーティング材６９を付着してなるシール部７０が形成されている。ここで、コーティング材６９としては、ＰＴＦＥ（ポリテトラフルオロエチレン）皮膜又は、二硫化モリブデンが望ましい。 Of the through hole 63 of the tip plug 60, the opening edge facing the inner space 11 of the compressor 10 is enlarged in a tapered shape toward the inner space 11. On the other hand, a tapered recess 66 is formed at the opening edge of the valve port 64 facing the valve housing chamber 25 side of the through hole 63. The tapered recess 66 is expanded in a mortar shape from the valve port 64 toward the end of the cylindrical portion 61. The tip plug 60 is formed of brass 67 corresponding to the “copper-containing member” of the present invention, and the tapered recess 66 of the tip plug 60 has a surface of the brass 67 as shown in FIG. A seal portion 70 is formed by plating a tin film 68 and depositing a coating material 69 on the tin film 68. Here, the coating material 69 is preferably a PTFE (polytetrafluoroethylene) film or molybdenum disulfide.

次に本実施形態の作用・効果を説明する。
コンプレッサ１０の内部空間１１に充填されている冷媒（圧縮流体）の圧力が、所定値以下の場合には、圧縮コイルバネ５４の付勢力によって、直動部材４０がコンプレッサ１０の内部空間１１側へ押し付けられ、弁体４５の先端部が先端詰栓６０の弁口６４に突入する。そしてこのとき、弁体４５のテーパー凸部４８（より詳細には、第２テーパー部４８Ｃ）が、先端詰栓６０のテーパー凹部６６に押し付けられて密着する。ここで、テーパー凹部６６の表面には、シール部７０が形成されているので、冷媒が高圧となった場合でも、テーパー凸部４８とテーパー凹部６６とが密着状態に保持され、圧力が所定値を超える前に弁口６４から冷媒が漏出することが防がれる。また、閉弁時には弁体４５（より詳細には、テーパー凸部４８）とテーパー凹部６６とが面当接するので、従来のリリーフバルブのように、弁体の端面に先端が尖った突部を突き当ててシールする構造（図５を参照）に比べて、リリーフバルブ２０の信頼性を高めることができる。 Next, the operation and effect of this embodiment will be described.
When the pressure of the refrigerant (compressed fluid) filled in the internal space 11 of the compressor 10 is not more than a predetermined value, the linear motion member 40 is pressed against the internal space 11 side of the compressor 10 by the urging force of the compression coil spring 54. Then, the tip of the valve body 45 enters the valve port 64 of the tip plug 60. At this time, the taper convex portion 48 (more specifically, the second taper portion 48C) of the valve body 45 is pressed against and closely contacts the taper concave portion 66 of the tip plug 60. Here, since the seal portion 70 is formed on the surface of the taper recess 66, the taper protrusion 48 and the taper recess 66 are held in close contact with each other even when the refrigerant has a high pressure, and the pressure is a predetermined value. The refrigerant is prevented from leaking out from the valve port 64 before the temperature exceeds. Further, when the valve is closed, the valve body 45 (more specifically, the taper convex portion 48) and the taper concave portion 66 are in surface contact with each other, so that a protruding portion with a sharp tip on the end surface of the valve body is provided like a conventional relief valve. The reliability of the relief valve 20 can be improved as compared with a structure in which it is abutted and sealed (see FIG. 5).

コンプレッサ１０が作動して、冷媒の圧力が所定値を超えると、弁体４５が図３における上方へ押し上げられ、直動部材４０が圧縮コイルバネ５４を押し縮めながら上方へスライドする。すると、図３に示すように、弁体４５が先端詰栓６０の弁口６４から離脱すると共に、テーパー凸部４８とテーパー凹部６６とが離間して、開弁状態となる。そして、コンプレッサ１０の内部空間１１に充填されていた冷媒が、先端詰栓６０の貫通孔６３を通って弁収容室２５に流入し、直動部材４０の側部貫通孔４４、直動部材４０の通気孔４３及び基端詰栓５０の貫通孔５１を通って、ハウジング２１の外側開放孔２７からコンプレッサ１０の外部に放出される。なお、図３に示すように、直動部材４０と基端詰栓５０の互いに対向した端部同士が当接すると、直動部材４０は、これ以上、外側開放孔２７側へ移動することが不可能となるので、弁体４５の先端部は、常に先端詰栓６０のテーパー凹部６６の内側領域に配置される。これにより、弁体４５の先端詰栓６０からの抜け止めが図られている。 When the compressor 10 operates and the refrigerant pressure exceeds a predetermined value, the valve body 45 is pushed upward in FIG. 3, and the linear motion member 40 slides upward while compressing and compressing the compression coil spring 54. Then, as shown in FIG. 3, the valve body 45 is detached from the valve port 64 of the tip plug 60, and the taper convex portion 48 and the taper concave portion 66 are separated from each other to open the valve. Then, the refrigerant filled in the internal space 11 of the compressor 10 flows into the valve housing chamber 25 through the through hole 63 of the tip plug 60, and the side through hole 44 of the linear motion member 40 and the linear motion member 40. The vent hole 43 and the through hole 51 of the proximal plug 50 are discharged from the outer opening 27 of the housing 21 to the outside of the compressor 10. As shown in FIG. 3, when the opposing ends of the linear movement member 40 and the proximal plug 50 are brought into contact with each other, the linear movement member 40 can no longer move to the outer opening hole 27 side. Therefore, the distal end portion of the valve body 45 is always disposed in the inner region of the tapered recess 66 of the distal end plug 60. As a result, the valve body 45 is prevented from coming off from the tip plug 60.

冷媒をコンプレッサ１０の外部に放出することで、コンプレッサ１０の内部空間１１の圧力が所定値以下に戻ると、再び、直動部材４０がハウジング２１の内周面に摺接しながら先端詰栓６０の弁口６４へ向けて案内され、弁体４５が貫通孔６３へ突入すると共に、テーパー凸部４８（より詳細には、第２テーパー部４８Ｃ）の周面とテーパー凹部６６の周面とが密着して閉弁状態とされる（図１の状態）。 When the pressure in the internal space 11 of the compressor 10 returns to a predetermined value or less by discharging the refrigerant to the outside of the compressor 10, the linear motion member 40 is again in sliding contact with the inner peripheral surface of the housing 21 and the tip plug 60 The valve body 45 is guided toward the valve port 64, and the valve body 45 enters the through hole 63, and the peripheral surface of the tapered convex portion 48 (more specifically, the second tapered portion 48 C) and the peripheral surface of the tapered concave portion 66 are in close contact with each other. Thus, the valve is closed (the state shown in FIG. 1).

このように本実施形態によれば、テーパー凹部６６の表面に錫皮膜６８をメッキし、その錫皮膜６８に重ねてコーティング材６９を付着してなるシール部７０が形成されたから、冷媒（圧縮流体）が高圧となっても、テーパー凸部４８とテーパー凹部６６とが密着状態に保持される。つまり、従来のゴム材を用いたリリーフバルブに比較して、より高圧の冷媒をコンプレッサ１０の内部空間１１に密封することが可能となる。また、閉弁時には、テーパー凸部４８とテーパー凹部６６とが面当接するので、従来のリリーフバルブに比較して信頼性が向上する。 As described above, according to the present embodiment, the surface of the tapered recess 66 is plated with the tin film 68, and the seal portion 70 is formed by attaching the coating material 69 to the tin film 68. ) Becomes high, the taper convex portion 48 and the taper concave portion 66 are held in close contact with each other. That is, a higher-pressure refrigerant can be sealed in the internal space 11 of the compressor 10 as compared with a relief valve using a conventional rubber material. Further, when the valve is closed, the taper convex portion 48 and the taper concave portion 66 are in surface contact with each other, so that the reliability is improved as compared with the conventional relief valve.

さらに、直動部材４０が、ハウジング２１の内側面に摺接して、弁口６４へ向けて案内されるので、弁体４５の弁口６４に対する位置ずれを防止することができ、弁体４５を確実に弁口６４に突入させることができる。しかも、弁体４５は、直動部材４０に対して容易に傾動可能なので、テーパー凹部６６や弁体４５の形状のばらつきが吸収され、弁口６４に対する弁体４５の位置ずれを防止できる。 Further, since the linear motion member 40 is slidably contacted with the inner surface of the housing 21 and guided toward the valve port 64, the displacement of the valve body 45 with respect to the valve port 64 can be prevented. It is possible to reliably enter the valve port 64. In addition, since the valve body 45 can be easily tilted with respect to the linear motion member 40, variations in the shape of the tapered recess 66 and the valve body 45 are absorbed, and the displacement of the valve body 45 with respect to the valve port 64 can be prevented.

［第２実施形態］
本実施形態のリリーフバルブ１２０は、図４に示されており、第１実施形態とは、主にハウジング及び直動部材の構成が異なる。本実施形態のハウジング１２１には、ハウジング１２１を側方から貫通して、弁収容室２５に連通した側部開放孔１２７，１２７が形成されている。 [Second Embodiment]
The relief valve 120 of the present embodiment is shown in FIG. 4 and differs from the first embodiment mainly in the configuration of the housing and the linear motion member. In the housing 121 of the present embodiment, side opening holes 127 and 127 that penetrate the housing 121 from the side and communicate with the valve accommodating chamber 25 are formed.

また、直動部材１４０は、円柱部１４１の先端に球状の球形凸部１４３を備え、円柱部１４１の基端部からは、円柱部１４１よりも径の小さい軸部１４２が起立している。そして、直動部材１４０の球形凸部１４３には、弁体１４５が保持されている。より詳細には、弁体１４５の陥没部４６に球形凸部１４３が突入した状態で、側壁４６Ａの上端部を内側へ折り曲げてかしめられている。 The linear motion member 140 includes a spherical spherical convex portion 143 at the distal end of the cylindrical portion 141, and a shaft portion 142 having a smaller diameter than the cylindrical portion 141 stands from the base end portion of the cylindrical portion 141. A valve body 145 is held on the spherical convex portion 143 of the linear motion member 140. More specifically, the upper end portion of the side wall 46 A is bent inward and caulked in a state in which the spherical convex portion 143 has entered the recessed portion 46 of the valve body 145.

ハウジング１２１のうちの外側開放孔２７には、圧縮コイルバネ５４と基端詰栓１５０とが収容されている。基端詰栓１５０は、外側開放孔２７に螺合されたヘッド部１５３を備え、そのヘッド部１５３から円筒部１５２が延設されている。圧縮コイルバネ５４は、直動部材１４０の軸部１４２及び基端詰栓１５０の円筒部１５２の外面に挿入されかつ、円柱部１４１と軸部１４２との間の段差面１４０Ｄ及び基端詰栓１５０のヘッド部１５３との間で突っ張り状態になっている。そして、上記第１実施形態と同様に、先端詰栓６０のテーパー凹部６６には、錫皮膜６８とコーティング材６９とを備えたシール部７０が形成されている。本実施形態によっても、上記第１実施形態と同等な効果を奏することができる。 A compression coil spring 54 and a proximal plug 150 are accommodated in the outer open hole 27 of the housing 121. The proximal plug plug 150 includes a head portion 153 that is screwed into the outer opening 27, and a cylindrical portion 152 extends from the head portion 153. The compression coil spring 54 is inserted into the outer surface of the shaft portion 142 of the linear motion member 140 and the cylindrical portion 152 of the proximal end plug 150, and the step surface 140 D between the column portion 141 and the shaft portion 142 and the head of the proximal end plug 150. It is in a stretched state with the part 153. Similar to the first embodiment, the tapered recess 66 of the tip plug 60 is formed with a seal portion 70 including a tin film 68 and a coating material 69. Also according to the present embodiment, an effect equivalent to that of the first embodiment can be obtained.

［他の実施形態］
本発明は、前記実施形態に限定されるものではなく、例えば、以下に説明するような実施形態も本発明の技術的範囲に含まれ、さらに、下記以外にも要旨を逸脱しない範囲内で種々変更して実施することができる。
（１）前記第１及び第２実施形態では、先端詰栓６０のテーパー凹部６６にシール部７０を設けていたが、弁体４５，１４５のテーパー凸部４８にシール部７０を設けてもよい。 [Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.
(1) In the first and second embodiments, the seal portion 70 is provided in the tapered concave portion 66 of the tip plug 60, but the seal portion 70 may be provided in the tapered convex portion 48 of the valve bodies 45 and 145. .

（２）前記第１及び第２実施形態では、シール部７０が設けられた先端詰栓６０が黄銅６７で構成されていたが、黄銅６７以外の他の銅含有合金でもよい。また、先端詰栓６０は、アルミ合金（本発明における「アルミニウムの含有部材」に相当する）で構成してもよい。 (2) In the first and second embodiments, the tip plug 60 provided with the seal portion 70 is made of brass 67, but other copper-containing alloys other than the brass 67 may be used. Further, the tip plug 60 may be made of an aluminum alloy (corresponding to “aluminum-containing member” in the present invention).

（３）前記第１及び第２実施形態では、シール部７０は、錫皮膜６８に重ねてコーティング材６９を付着してなる構成であったが、錫皮膜６８又はコーティング材６９の何れか一方のみで構成してもよい。なお、錫皮膜６８を形成する場合には、皮膜が形成される部材を銅含有部材（例えば、黄銅６７）又はアルミニウム含有部材（例えば、アルミ合金）とすることが望ましいが、シール部７０をコーティング材６９だけで構成する場合には、皮膜が形成される部材は銅又はアルミニウム含有部材に限られず、銅、アルミニウム以外の金属、ゴム又は合成樹脂でもよい。 (3) In the first and second embodiments, the seal portion 70 has a configuration in which the coating material 69 is adhered to the tin film 68, but only one of the tin film 68 and the coating material 69 is used. You may comprise. When the tin film 68 is formed, the member on which the film is formed is desirably a copper-containing member (for example, brass 67) or an aluminum-containing member (for example, an aluminum alloy), but the seal portion 70 is coated. In the case of only the material 69, the member on which the film is formed is not limited to a copper or aluminum-containing member, but may be a metal other than copper or aluminum, rubber, or synthetic resin.

本発明の第１実施形態に係るリリーフバルブの側断面図Side sectional view of the relief valve according to the first embodiment of the present invention. 先端詰栓の拡大側断面図Enlarged side sectional view of the tip plug 開弁状態時のリリーフバルブの側断面図Side sectional view of the relief valve when the valve is open 第２実施形態に係るリリーフバルブの側断面図Side sectional view of the relief valve according to the second embodiment 従来のリリーフバルブの側断面図Side sectional view of a conventional relief valve

Explanation of symbols

１０コンプレッサ（機器）
１１内部空間（流体収容室）
２０，１２０リリーフバルブ
２１，１２１ハウジング
４０，１４０直動部材
４１，１４３球形凸部（弁体連結機構）
４５，１４５弁体
４７球形凹部（弁体連結機構）
４８テーパー凸部
６４弁口
６６テーパー凹部
６７黄銅（銅の含有部材）
６８錫皮膜
６９コーティング材
７０シール部

10 Compressor (equipment)
11 Internal space (fluid storage chamber)
20, 120 Relief valve 21, 121 Housing 40, 140 Linear motion member 41, 143 Spherical convex part (valve connection mechanism)
45,145 Valve body 47 Spherical recess (Valve connection mechanism)
48 Tapered convex portion 64 Valve port 66 Tapered concave portion 67 Brass (copper-containing member)
68 Tin coating 69 Coating material 70 Sealing part

Claims

A housing (21, 121) fixed to a device (10) having a fluid storage chamber (11);
A valve port (64) formed in the housing (21, 121) and facing the fluid storage chamber (11);
A linear motion member (40, 140) housed in the housing (21, 121) and guided so as to be linearly movable toward the valve port (64);
A valve body (45, 145) for opening and closing the valve port (64);
A valve body coupling mechanism (41, 47, 143) in which the valve body (45, 145) is tiltably coupled to the tip of the linear motion member (40, 140);
A tapered protrusion (48) formed at the tip of the valve body (45, 145);
A tapered recess (66) formed at an opening edge of the valve port (64) and pressed against the tapered protrusion (48);
Either the taper convex part (48) or the taper concave part (66) is formed of a copper or aluminum containing member (67), and the surface of the copper or aluminum containing member (67) is a tin film (68). A relief valve (20, 120) comprising a seal portion (70) formed by plating

A housing (21, 121) fixed to a device (10) having a fluid storage chamber (11);
A valve port (64) formed in the housing (21, 121) and facing the fluid storage chamber (11);
A linear motion member (40, 140) housed in the housing (21, 121) and guided so as to be linearly movable toward the valve port (64);
A valve body (45, 145) for opening and closing the valve port (64);
A valve body connection mechanism (41, 47, 143) for connecting the valve body (45, 145) to the tip of the linear motion member (40, 140) in a tiltable manner;
A tapered protrusion (48) formed at the tip of the valve body (45, 145);
A tapered recess (66) formed at an opening edge of the valve port (64) and pressed against the tapered protrusion (48);
A relief valve (20, 120) comprising a seal portion (70) formed by adhering a coating material (69) to either the tapered convex portion (48) or the tapered concave portion (66). .

A housing (21, 121) fixed to a device (10) having a fluid storage chamber (11);
A valve port (64) formed in the housing (21, 121) and facing the fluid storage chamber (11);
A linear motion member (40, 140) housed in the housing (21, 121) and guided so as to be linearly movable toward the valve port (64);
A valve body (45, 145) for opening and closing the valve port (64);
A valve body coupling mechanism (41, 47, 143) in which the valve body (45, 145) is tiltably coupled to the tip of the linear motion member (40, 140);
A tapered protrusion (48) formed at the tip of the valve body (45, 145);
A tapered recess (66) formed at an opening edge of the valve port (64) and pressed against the tapered protrusion (48);
Either the taper convex portion (48) or the taper concave portion (66) is formed of a copper or aluminum containing member (67), and the surface of the copper or aluminum containing member (67) is a tin film (68). And a seal portion (70) formed by depositing a coating material (69) on the tin film (68).

The valve body coupling mechanism (41, 47, 143) includes a spherical convex portion (41, 143) provided at a tip portion of the linear motion member (40, 140),
A spherical concave portion (47) formed in the valve body (45, 145), into which the spherical convex portion (41, 143) is inserted, and whose inner surface is rounded corresponding to the spherical convex portion (41, 143). The relief valve (20, 120) according to any one of claims 1 to 3, characterized by comprising: