JP6900348B2 - Welded structure and valve gear - Google Patents

Welded structure and valve gear Download PDF

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JP6900348B2
JP6900348B2 JP2018098684A JP2018098684A JP6900348B2 JP 6900348 B2 JP6900348 B2 JP 6900348B2 JP 2018098684 A JP2018098684 A JP 2018098684A JP 2018098684 A JP2018098684 A JP 2018098684A JP 6900348 B2 JP6900348 B2 JP 6900348B2
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welded
bellows
melt
solidified
connecting portion
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JP2019202329A (en
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一徳 南波佐間
一徳 南波佐間
祐成 室屋
祐成 室屋
金崎　文雄
文雄 金崎
佳祐 村田
佳祐 村田
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Saginomiya Seisakusho Inc
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Saginomiya Seisakusho Inc
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J3/00—Diaphragms; Bellows; Bellows pistons
    • F16J3/04—Bellows
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/44—Mechanical actuating means
    • F16K31/60—Handles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K41/00—Spindle sealings
    • F16K41/10—Spindle sealings with diaphragm, e.g. shaped as bellows or tube

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Valves (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Diaphragms And Bellows (AREA)

Description

本発明は、対象部位に対して薄板材からなる可撓部材を溶接接合するための溶接構造、および該溶接構造によって可撓部材が装置内部の対象部位に固定された弁装置に関する。 The present invention relates to a welded structure for welding and joining a flexible member made of a thin plate material to a target portion, and a valve device in which the flexible member is fixed to the target portion inside the device by the welded structure.

従来、例えば、冷凍空調装置やバルブ（弁装置）、配管継手、カプラ等において、伸縮可能なシール部材（可撓部材）として、金属ベローズが利用されている。金属ベローズとしては、複数の金属製環状プレートの外周縁および内周縁を交互に溶接接合して構成される溶接金属ベローズや、円筒状の金属薄板材をプレス加工（例えば、バルジ加工）によって蛇腹状に成形した成形金属ベローズなどが用いられ、そのような金属ベローズの軸方向両端部にフランジ部材等が溶接固定された構造が一般的である（例えば、特許文献１、２参照）。このような金属ベローズが用いられる機器の一例として、感圧制御弁やベローズ式圧力応動弁、流量制御弁などの弁装置があり（例えば、特許文献３〜５参照）、各弁装置は、装置内部に取り付けられた金属ベローズによって内部空間をシールするとともに、弁体等の変位に応じて金属ベローズが伸縮するように構成されている。 Conventionally, for example, a metal bellows has been used as a stretchable seal member (flexible member) in a refrigerating air conditioner, a valve (valve device), a piping joint, a coupler, and the like. As the metal bellows, a welded metal bellows formed by alternately welding and joining the outer peripheral edge and the inner peripheral edge of a plurality of metal annular plates, or a cylindrical metal thin plate material is pressed (for example, bulge processing) into a bellows shape. A molded metal bellows or the like molded into the above is generally used, and a structure in which flange members or the like are welded and fixed to both ends in the axial direction of such a metal bellows is common (see, for example, Patent Documents 1 and 2). As an example of a device in which such a metal bellows is used, there are valve devices such as a pressure sensitive valve, a bellows type pressure response valve, and a flow rate control valve (see, for example, Patent Documents 3 to 5), and each valve device is a device. The metal bellows attached to the inside seals the internal space, and the metal bellows expands and contracts according to the displacement of the valve body and the like.

一方、例えば、冷凍空調装置等に利用される弁装置において、弁室をシールするためのシール部材（可撓部材）として、金属ダイヤフラムが利用されている。この弁装置（ダイヤフラム弁）は、弁室および弁口を有する弁本体と、弁室内に進退自在に設けられる弁体と、弁本体と弁体とに亘って設けられて弁室をシールする金属ダイヤフラムと、を備えている。金属ダイヤフラムは、全体円盤状の薄板材で形成され、その外周縁が弁本体に溶接固定されている。 On the other hand, for example, in a valve device used for a refrigerating air conditioner or the like, a metal diaphragm is used as a sealing member (flexible member) for sealing the valve chamber. This valve device (diaphragm valve) is a valve body having a valve chamber and a valve opening, a valve body provided freely in the valve chamber, and a metal provided over the valve body and the valve body to seal the valve chamber. It is equipped with a diaphragm. The metal diaphragm is formed of a thin plate material having a disk shape as a whole, and its outer peripheral edge is welded and fixed to the valve body.

ところで、例えば、冷媒等の高温、高圧流体の流量等を制御する弁装置において、金属ベローズや金属ダイヤフラムの金属素材としては耐熱性や耐蝕性に優れたステンレス合金やニッケル基合金が用いられ、その溶接対象物であるフランジ部材や弁体の金属素材としてはステンレス合金が用いられることがある。特に、ステンレス合金としては、オーステナイト系ステンレス鋼（例えば、ＳＵＳ３１６Ｌなど）が用いられ、ニッケル基合金としては、耐熱性、耐蝕性、耐酸化性などに優れたインコネル（登録商標。例えば、インコネル６２５など）が用いられることがあり、加工性や材料コスト等の要因から部位ごとに異なる金属素材が適宜に選択され、その異種金属素材同士が溶接されることがある。 By the way, for example, in a valve device that controls a high temperature of a refrigerant or the like, a flow rate of a high-pressure fluid, etc., a stainless alloy or a nickel-based alloy having excellent heat resistance and corrosion resistance is used as a metal material for a metal bellows or a metal diaphragm. A stainless alloy may be used as the metal material for the flange member or valve body to be welded. In particular, austenitic stainless steel (for example, SUS316L) is used as the stainless alloy, and Inconel (registered trademark, for example, Inconel 625, etc.) having excellent heat resistance, corrosion resistance, oxidation resistance, etc. is used as the nickel-based alloy. ) May be used, and different metal materials may be appropriately selected for each part due to factors such as workability and material cost, and the dissimilar metal materials may be welded to each other.

特開２００４−１６２７２８号公報Japanese Unexamined Patent Publication No. 2004-162728 特開２００３−１４８６１６号公報Japanese Unexamined Patent Publication No. 2003-148616 特開２０００−３３７７３６号公報Japanese Unexamined Patent Publication No. 2000-337736 特開２０００−８８１３２号公報Japanese Unexamined Patent Publication No. 2000-88132 特開２００３−１９４２５０号公報Japanese Unexamined Patent Publication No. 2003-194250

しかしながら、オーステナイト系ステンレス鋼は、一般的に溶接割れを起こしやすい金属素材であることが知られており、オーステナイト系ステンレス鋼とニッケル基合金等との異種金属素材同士の溶接においても、溶接欠陥が生じやすいことが予想される。特に、薄板材からなる金属ベローズや金属ダイヤフラム等の可撓部材を肉厚な対象部位に溶接する際に、可撓部材を板厚方向に貫通して対象部位の内部に至るような溶接部が形成されると、溶融金属が固化するときの収縮が拘束されることから、溶接固化部に引張応力が作用して割れが発生しやすくなる。このため、可撓部材と対象部位との異種金属素材同士の溶接部における溶接割れを防止しつつ、溶接耐久性を向上させることができる溶接構造が求められていた。 However, austenite-based stainless steel is generally known to be a metal material that easily causes welding cracks, and welding defects occur even in welding of dissimilar metal materials such as austenite-based stainless steel and nickel-based alloys. It is expected to occur easily. In particular, when a flexible member such as a metal bellows or a metal diaphragm made of a thin plate material is welded to a thick target portion, a welded portion that penetrates the flexible member in the plate thickness direction and reaches the inside of the target portion is formed. Once formed, the shrinkage when the molten metal solidifies is constrained, so that tensile stress acts on the weld solidified portion and cracks are likely to occur. Therefore, there has been a demand for a welded structure capable of improving welding durability while preventing weld cracks in welded portions of dissimilar metal materials between the flexible member and the target portion.

本発明の目的は、異種金属素材同士の溶接部における溶接割れを防止しつつ、溶接耐久性を向上させることができる溶接構造および弁装置を提供することである。 An object of the present invention is to provide a welded structure and a valve device capable of improving welding durability while preventing weld cracks in welded portions of dissimilar metal materials.

本発明の溶接構造は、対象部位に対して薄板材からなる可撓部材を溶接接合するための溶接構造であって、前記対象部位および前記可撓部材は、互いの溶融固化部が主としてオーステナイト相となる異種金属素材からなり、前記対象部位は、第一面と、その反対側の第二面と、を有した突起状の接続部を備え、前記可撓部材は、前記接続部の前記第一面に沿う板状の被溶接部を有し、前記溶融固化部は、前記接続部および前記被溶接部の先端部に設けられるとともに、前記接続部および前記被溶接部を合せた厚み寸法以上の直径を有する断面円形に形成され、前記接続部の先端側および前記被溶接部の先端側の厚み寸法が互いに同程度であり、前記対象部位は、主としてオーステナイト系ステンレス鋼から構成され、前記可撓部材は、主としてＮＣＦ６００、ＮＣＦ６０１、ＮＣＦ６２５、ＮＣＦ６９０のうちのいずれかのニッケル基合金から構成されることを特徴とする。 The welded structure of the present invention is a welded structure for welding and joining a flexible member made of a thin plate material to a target portion, and the target portion and the flexible member are mainly austenite phases in a melt-solidified portion of each other. The target portion is made of a dissimilar metal material, and the target portion includes a protruding connecting portion having a first surface and a second surface on the opposite side thereof, and the flexible member is the first surface of the connecting portion. It has a plate-shaped welded portion along one surface, and the melt-solidified portion is provided at the connection portion and the tip portion of the welded portion, and is equal to or larger than the thickness dimension of the connection portion and the welded portion combined. The thickness dimension of the tip side of the connection portion and the tip side of the welded portion is about the same, and the target portion is mainly composed of austenite-based stainless steel. The flexible member is mainly composed of a nickel-based alloy of any one of NCF600, NCF601, NCF625, and NCF690 .

このような本発明によれば、対象部位の接続部および可撓部材の被溶接部の先端部に溶融固化部が設けられ、接続部および被溶接部を合せた厚み寸法以上の直径を有する断面円形に溶融固化部が形成されていることで、溶接割れを防止することができる。すなわち、接続部と被溶接部の先端部同士を溶接する際に、溶融した金属が表面張力で断面円形（溶接部が点であれば球状）となることで、凝固する過程で収縮したとしても、その収縮力が母材に作用しにくくなり、収縮による引張応力の発生を抑制することができる。従って、溶融固化部が主としてオーステナイト相となる異種金属素材同士であり、溶融固化部や周辺の母材に溶接割れが生じやすい条件であっても、溶接割れを防止することができ、残留応力を抑制することによって溶接耐久性を向上させることができる。 According to the present invention, a melt-solidified portion is provided at the connection portion of the target portion and the tip portion of the welded portion of the flexible member, and the cross section has a diameter equal to or larger than the combined thickness dimension of the connection portion and the welded portion. Weld cracking can be prevented by forming the melt-solidified portion in a circular shape. That is, when the tips of the connection portion and the welded portion are welded to each other, the molten metal becomes circular in cross section (spherical if the welded portion is a point) due to surface tension, and even if it shrinks in the process of solidification. , The contraction force is less likely to act on the base metal, and the generation of tensile stress due to contraction can be suppressed. Therefore, even if the molten and solidified portions are dissimilar metal materials mainly in the austenite phase and weld cracks are likely to occur in the molten and solidified portions and the surrounding base material, welding cracks can be prevented and residual stress can be reduced. Welding durability can be improved by suppressing it.

また、接続部の先端側および被溶接部の先端側の厚み寸法が互いに同程度であることで、これらの先端部同士を溶接する際に溶融する金属量が互いに同程度になり、凝固する際の収縮方向が偏らないことから引張応力の発生をさらに抑制でき、溶接割れを防止することができる。 Further , since the thickness dimensions of the tip side of the connecting portion and the tip side of the welded portion are about the same, the amount of metal melted when welding these tip portions becomes the same as each other, and when solidifying. Since the shrinkage direction of the is not biased, the generation of tensile stress can be further suppressed, and welding cracks can be prevented.

さらに、対象部位が主としてオーステナイト系ステンレス鋼から構成され、可撓部材が主としてＮＣＦ６００、ＮＣＦ６０１、ＮＣＦ６２５、ＮＣＦ６９０のうちのいずれかのニッケル基合金から構成されることで、各部ごとに適切な特性を有した金属素材を選択しつつ、溶接耐久性を向上させることができる。 Furthermore , the target part is mainly composed of austenitic stainless steel, and the flexible member is mainly composed of a nickel-based alloy of any of NCF600, NCF601, NCF625, and NCF690, so that each part has appropriate characteristics. Welding durability can be improved while selecting a stainless steel material.

さらに、前記可撓部材は、円筒状かつ蛇腹状に形成された金属ベローズであり、前記対象部位は、前記金属ベローズの軸方向末端に固定されるフランジ部材であって、前記接続部は、径方向の外側方向に突出するとともに周方向に連続した環状に形成され、前記被溶接部は、前記金属ベローズの軸方向末端にて径方向の外側方向に延びるとともに、周方向に連続した環状に形成され、前記溶融固化部は、前記接続部および前記被溶接部の先端部に沿って周方向に連続して設けられていることが好ましい。 Further, the flexible member is a metal bellows formed in a cylindrical and bellows shape, the target portion is a flange member fixed to the axial end of the metal bellows, and the connecting portion has a diameter. It is formed in an annular shape that protrudes outward in the direction and is continuous in the circumferential direction, and the welded portion extends in the radial outward direction at the axial end of the metal bellows and is formed in an annular shape that is continuous in the circumferential direction. Therefore, it is preferable that the melt-solidified portion is continuously provided in the circumferential direction along the tip portion of the connecting portion and the welded portion.

また、前記可撓部材は、円筒状かつ蛇腹状に形成された金属ベローズであり、前記対象部位は、前記金属ベローズの軸方向末端に固定されるフランジ部材であって、前記接続部は、径方向の内側方向に突出するとともに周方向に連続した環状に形成され、前記被溶接部は、前記金属ベローズの軸方向末端にて径方向の内側方向に延びるとともに、周方向に連続した環状に形成され、前記溶融固化部は、前記接続部および前記被溶接部の先端部に沿って周方向に連続して設けられていてもよい。 Further, the flexible member is a metal bellows formed in a cylindrical and bellows shape, the target portion is a flange member fixed to the axial end of the metal bellows, and the connecting portion has a diameter. It is formed in an annular shape that protrudes inward in the direction and is continuous in the circumferential direction, and the welded portion extends in the radial inward direction at the axial end of the metal bellows and is formed in an annular shape that is continuous in the circumferential direction. The melt-solidified portion may be continuously provided in the circumferential direction along the connecting portion and the tip end portion of the welded portion.

さらに、前記可撓部材は、円筒状かつ蛇腹状に形成された金属ベローズであり、前記対象部位は、前記金属ベローズの軸方向末端に固定されるフランジ部材であって、前記接続部は、軸方向の外側方向に突出するとともに周方向に連続した環状に形成され、前記被溶接部は、前記金属ベローズの軸方向末端にて軸方向の外側方向に延びるとともに、周方向に連続した環状に形成され、前記溶融固化部は、前記接続部および前記被溶接部の先端部に沿って周方向に連続して設けられていてもよい。 Further, the flexible member is a metal bellows formed in a cylindrical and bellows shape, the target portion is a flange member fixed to the axial end of the metal bellows, and the connecting portion is a shaft. It is formed in an annular shape that protrudes outward in the direction and is continuous in the circumferential direction, and the welded portion extends outward in the axial direction at the axial end of the metal bellows and is formed in an annular shape that is continuous in the circumferential direction. The melt-solidified portion may be continuously provided in the circumferential direction along the connecting portion and the tip end portion of the welded portion.

これらの構成によれば、金属ベローズとフランジ部材との溶接部における溶接割れを防止するとともに、周方向に連続した溶融固化部の溶接耐久性を向上させることで、良好なシール性が維持されることから製品寿命を延ばすことができる。 According to these configurations, good sealing performance is maintained by preventing weld cracks in the welded portion between the metal bellows and the flange member and improving the weld durability of the melt-solidified portion continuous in the circumferential direction. Therefore, the product life can be extended.

また、弁本体の弁室内に設けられる弁体と、前記弁室をシールする前記可撓部材としてのダイヤフラムと、を備えた弁装置に用いられ、前記弁本体は、周方向に連続した環状の前記接続部を有し、前記ダイヤフラムは、円板状の外周縁に沿って周方向に連続した環状の前記被溶接部を有して構成され、前記溶融固化部は、前記接続部および前記被溶接部の先端部に沿って周方向に連続して設けられていることが好ましい。 Further, it is used in a valve device provided with a valve body provided in the valve chamber of the valve body and a diaphragm as the flexible member for sealing the valve chamber, and the valve body is an annular shape continuous in the circumferential direction. The diaphragm has the connecting portion, and the diaphragm is configured to have the annular portion to be welded that is continuous in the circumferential direction along the outer peripheral edge of the disk shape, and the melt-solidified portion is the connecting portion and the covering portion. It is preferable that the welded portion is continuously provided along the tip portion in the circumferential direction.

この構成によれば、弁装置における弁本体と可撓部材としてのダイヤフラムとの溶接部における溶接割れを防止するとともに、周方向に連続した溶融固化部の溶接耐久性を向上させることで、良好なシール性が維持されることから弁装置の製品寿命を延ばすことができる。 According to this configuration, it is good by preventing welding cracks in the welded portion between the valve body and the diaphragm as a flexible member in the valve device and improving the welding durability of the melt-solidified portion continuous in the circumferential direction. Since the sealing property is maintained, the product life of the valve device can be extended.

また、前記溶融固化部の直径は、前記接続部および前記被溶接部を合せた厚み寸法に対し、１．１倍以上かつ１．６倍以下であることが好ましい。 Further, the diameter of the melt-solidified portion is preferably 1.1 times or more and 1.6 times or less with respect to the thickness dimension of the connection portion and the welded portion combined.

この構成によれば、溶融固化部の直径が接続部および被溶接部を合せた厚み寸法に対して１．１倍以上かつ１．６倍以下に設定されることで、溶融固化部と被溶接部および接続部を滑らかに連続させ、被溶接部や接続部の先端にエッジが残らないようにすることができ、溶接部の溶接耐久性や力学特性を向上させることができる。 According to this configuration, the diameter of the melt-solidified portion is set to 1.1 times or more and 1.6 times or less the total thickness of the connection portion and the welded portion, so that the melt-solidified portion and the welded portion are welded. It is possible to smoothly connect the portions and the connecting portions so that no edges remain at the tips of the welded portions and the connecting portions, and it is possible to improve the welding durability and mechanical properties of the welded portions.

また、前記接続部における前記第一面と前記第二面とは、当該接続部の先端に向かって狭まる交差角度を有して設けられ、前記交差角度が４０°以下であることが好ましい。 Further, it is preferable that the first surface and the second surface of the connecting portion are provided with an intersecting angle narrowing toward the tip of the connecting portion, and the intersecting angle is 40 ° or less.

この構成によれば、接続部における第一面と第二面とが先端に向かって狭まる４０°以下の交差角度で設けられていることで、溶融金属が凝固する際の収縮力が母材に与える影響を抑制し、接続部の溶接割れを防止することができる。 According to this configuration, since the first surface and the second surface of the connecting portion are provided at an intersection angle of 40 ° or less that narrows toward the tip, the shrinkage force when the molten metal solidifies is applied to the base metal. It is possible to suppress the influence and prevent welding cracks at the connection portion.

また、本発明の溶接構造は、対象部位に対して薄板材からなる可撓部材を溶接接合するための溶接構造であって、前記対象部位および前記可撓部材は、互いの溶融固化部が主としてオーステナイト相となる異種金属素材からなり、前記対象部位は、第一面と、その反対側の第二面と、を有した突起状の接続部を備え、前記可撓部材は、前記接続部の前記第一面に沿う板状の被溶接部を有し、前記溶融固化部は、前記接続部および前記被溶接部の先端部に設けられるとともに、前記接続部および前記被溶接部を合せた厚み寸法以上の直径を有する断面円形に形成され、前記被溶接部は、前記可撓部材を構成する薄板材の端部を折り返して重ねた折返部によって構成され、前記薄板材の端縁側が前記接続部の前記第一面に沿って設けられていることが好ましい。 Further, the welded structure of the present invention is a welded structure for welding and joining a flexible member made of a thin plate material to a target portion, and the target portion and the flexible member are mainly formed by melting and solidifying each other. The target portion is made of a dissimilar metal material to be an austenite phase, the target portion includes a protruding connection portion having a first surface and a second surface on the opposite side thereof, and the flexible member is the connection portion of the connection portion. It has a plate-shaped welded portion along the first surface, and the melt-solidified portion is provided at the connection portion and the tip portion of the welded portion, and the thickness of the connection portion and the welded portion combined. The welded portion is formed in a circular cross section having a diameter equal to or larger than the dimension, and the welded portion is composed of a folded portion in which the end portions of the thin plate material constituting the flexible member are folded and overlapped, and the edge side of the thin plate material is the connection. It is preferable that the portion is provided along the first surface of the portion.

この構成によれば、薄板材の端部を折り返して重ねた折返部によって可撓部材の被溶接部を構成することで、被溶接部の厚み寸法が大きくなり、溶接時の熱の影響や凝固する際の収縮力の影響を抑制し、被溶接部の溶接割れを防止することができる。 According to this configuration, the thickness dimension of the welded portion is increased by forming the welded portion of the flexible member by the folded portion in which the end portions of the thin plate material are folded and overlapped, and the thickness dimension of the welded portion is increased, and the influence of heat during welding and solidification It is possible to suppress the influence of the shrinkage force at the time of welding and prevent welding cracks in the welded portion.

本発明の弁装置は、前記いずれかの溶接構造によって可撓部材が装置内部の対象部位に固定されていることを特徴とする。 The valve device of the present invention is characterized in that the flexible member is fixed to a target portion inside the device by any of the above welded structures.

このような弁装置によれば、前述の溶接構造による効果と同様に、可撓部材と対象部位との溶接割れを防止して溶接耐久性を向上させることができるので、弁装置の製品寿命を延ばすことができる。 According to such a valve device, similar to the effect of the welding structure described above, it is possible to prevent welding cracks between the flexible member and the target portion and improve the welding durability, so that the product life of the valve device can be extended. Can be extended.

本発明の溶接構造および弁装置によれば、異種金属素材同士の溶接部における溶接割れを防止しつつ、溶接耐久性を向上させることができる。 According to the welding structure and valve device of the present invention, it is possible to improve welding durability while preventing welding cracks in welded portions of dissimilar metal materials.

本発明の第１実施形態の溶接構造を用いたベローズを示す断面図である。It is sectional drawing which shows the bellows using the welded structure of 1st Embodiment of this invention. （Ａ），（Ｂ）は、前記ベローズの要部を示す拡大断面図である。(A) and (B) are enlarged cross-sectional views showing a main part of the bellows. 第１実施形態の溶接構造を用いた他のベローズを示す断面図である。It is sectional drawing which shows the other bellows using the welded structure of 1st Embodiment. （Ａ），（Ｂ）は、前記他のベローズの要部を示す拡大断面図である。(A) and (B) are enlarged cross-sectional views showing the main parts of the other bellows. 本発明の第２実施形態の溶接構造を用いたベローズを示す断面図である。It is sectional drawing which shows the bellows using the welded structure of 2nd Embodiment of this invention. （Ａ），（Ｂ）は、前記ベローズの要部を示す拡大断面図である。(A) and (B) are enlarged cross-sectional views showing a main part of the bellows. 本発明の第３実施形態の溶接構造を用いたベローズを示す断面図である。It is sectional drawing which shows the bellows using the welded structure of 3rd Embodiment of this invention. （Ａ），（Ｂ）は、前記ベローズの要部を示す拡大断面図である。(A) and (B) are enlarged cross-sectional views showing a main part of the bellows. 本発明の溶接構造を用いた弁装置を示す断面図である。It is sectional drawing which shows the valve device which used the welding structure of this invention. 本発明の溶接構造を用いた他の弁装置を示す断面図である。It is sectional drawing which shows the other valve device using the welded structure of this invention. （Ａ），（Ｂ）は、前記弁装置の要部を示す拡大断面図である。(A) and (B) are enlarged cross-sectional views showing a main part of the valve device.

本発明の第１実施形態の溶接構造は、冷凍空調装置やバルブ（弁装置）、ポンプ、圧力スイッチ、配管継手、カプラ等の各種機器において、伸縮可能なシール部材として用いられる金属ベローズに適用される。このような機器のうち冷凍空調装置等に利用される弁装置としては、例えば、各種の制御弁や圧力応動弁等があり、可撓部材である金属ベローズは、装置内部（例えば、弁室）の対象部位（例えば、弁本体や弁体）に固定され、対象部位間の相対変位に伴って伸縮自在に設けられている。 The welded structure of the first embodiment of the present invention is applied to a metal bellows used as a stretchable seal member in various devices such as a refrigerating air conditioner, a valve (valve device), a pump, a pressure switch, a pipe joint, and a coupler. To. Among such devices, valve devices used for refrigeration and air conditioning devices include, for example, various control valves, pressure response valves, and the like, and the metal bellows, which is a flexible member, is inside the device (for example, the valve chamber). It is fixed to the target part (for example, the valve body or the valve body), and is provided so as to be expandable and contractible according to the relative displacement between the target parts.

以下、第１実施形態の溶接構造を用いたベローズについて、図１、図２に基づいて説明する。図１は、第１実施形態の溶接構造を用いたベローズ１０を示す断面図である。図２は、ベローズ１０の要部を示す拡大断面図であり、図１に丸囲み部Ａで示す部分の拡大図である。また、図２（Ａ）は溶接接合されたベローズ１０の要部を示し、図２（Ｂ）はベローズ１０の溶接接合前の状態を示している。 Hereinafter, the bellows using the welded structure of the first embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a cross-sectional view showing a bellows 10 using the welded structure of the first embodiment. FIG. 2 is an enlarged cross-sectional view showing a main part of the bellows 10, and is an enlarged view of a part shown by a circled portion A in FIG. Further, FIG. 2A shows a main part of the bellows 10 welded and joined, and FIG. 2B shows a state of the bellows 10 before welding and joining.

図１、２に示すように、ベローズ１０は、金属ベローズである成形ベローズ（可撓部材）１１と、成形ベローズ１１の軸方向（図１に示す中心軸Ｘに沿った方向）両端に固定される一対のフランジ部材（対象部位）１２，１３と、を備えている。成形ベローズ１１と一対のフランジ部材１２，１３とは、溶融固化部１４によって互いに溶接接合されている。 As shown in FIGS. 1 and 2, the bellows 10 are fixed to both ends of the molded bellows (flexible member) 11 which is a metal bellows and the axial direction (direction along the central axis X shown in FIG. 1) of the molded bellows 11. A pair of flange members (target parts) 12 and 13 are provided. The molded bellows 11 and the pair of flange members 12 and 13 are welded and joined to each other by the melt-solidified portion 14.

成形ベローズ１１は、全体円筒状でありプレス加工（例えば、バルジ加工）等によって蛇腹状に成形された薄板材からなり、薄板材の厚み寸法ｔ1は、０．１ｍｍ〜０．２ｍｍ程度である。成形ベローズ１１の軸方向両端部には、図２に示すように、薄板材の端部を折り返して重ねた折返部によって構成された被溶接部１１ａが設けられ、この被溶接部１１ａは、成形ベローズ１１の軸方向両端部にて径方向の外側方向に延びるとともに、周方向に連続した環状に形成されている。被溶接部１１ａの厚み寸法ＴBは、成形ベローズ１１の薄板材を２枚重ねた寸法（ＴB＝２ｔ1）であり、０．２ｍｍ〜０．４ｍｍ程度となっている。 The molded bellows 11 is entirely cylindrical and is made of a thin plate material formed in a bellows shape by press working (for example, bulge processing) or the like, and the thickness dimension t 1 of the thin plate material is about 0.1 mm to 0.2 mm. .. As shown in FIG. 2, at both ends of the molded bellows 11 in the axial direction, welded portions 11a formed by folded back portions of thin plate materials are provided, and the welded portions 11a are formed. Both ends of the bellows 11 in the axial direction extend outward in the radial direction and are formed in a ring shape continuous in the circumferential direction. Thickness T B of the welded portion 11a is a thin plate material with two-ply dimensions of molded bellows 11 (T B = 2t 1) , are on the order of 0.2 mm to 0.4 mm.

フランジ部材１２，１３は、全体円盤状に形成された板材からなり、その厚み寸法は成形ベローズ１１の厚み寸法ｔ1と比較して十分に大きなものであり、可撓性を有した成形ベローズ１１に対して実質的に剛体となっている。フランジ部材１２，１３における互いに対向する面１２ａ，１３ａの外周縁には、それぞれ成形ベローズ１１が溶接される接続部１５が形成されている。接続部１５は、フランジ部材１２，１３の外周面から径方向の外側方向に突出するとともに、周方向に連続した環状に形成されている。また、接続部１５は、図２（Ｂ）に示すように、フランジ部材１２，１３の面１２ａ，１３ａと面一に連続する第一面１５ａと、その反対側の第二面１５ｂと、を有して突起状に形成されている。成形ベローズ１１の被溶接部１１ａは、その折返部における薄板材の端縁側が第一面１５ａに沿って設けられている。 The flange members 12 and 13 are made of a plate material formed in a disk shape as a whole, and the thickness dimension thereof is sufficiently larger than the thickness dimension t 1 of the molded bellows 11, and the molded bellows 11 has flexibility. However, it is substantially rigid. Connecting portions 15 to which the molded bellows 11 are welded are formed on the outer peripheral edges of the surfaces 12a and 13a of the flange members 12 and 13 facing each other. The connecting portion 15 projects outward in the radial direction from the outer peripheral surfaces of the flange members 12 and 13, and is formed in an annular shape continuous in the circumferential direction. Further, as shown in FIG. 2B, the connecting portion 15 has a first surface 15a that is flush with the surfaces 12a and 13a of the flange members 12 and 13 and a second surface 15b on the opposite side. It has and is formed in a protruding shape. The welded portion 11a of the molded bellows 11 is provided with the edge side of the thin plate material at the folded portion along the first surface 15a.

成形ベローズ１１と溶接接合される前のフランジ部材１２，１３において、接続部１５は、図２（Ｂ）に示すように、第一面１５ａおよび第二面１５ｂに連続し、かつ、接続部１５の先端側を構成する第三面１５ｃを有している。接続部１５の先端側の厚み寸法ＴF、つまり第三面１５ｃの高さ寸法は、被溶接部１１ａの厚み寸法ＴBと同程度（ＴF＝ＴB、０．２ｍｍ〜０．４ｍｍ程度）となっている。なお、被溶接部１１ａの厚み寸法ＴBと接続部１５の先端側の厚み寸法ＴFとは、０．８≦（ＴB／ＴF）≦１．２となるように設定されていることが好ましい。また、第一面１５ａと第二面１５ｂとは、接続部１５の先端に向かって狭まる交差角度θを有して設けられ、この交差角度θが３０°程度になっている。なお、第一面１５ａと第二面１５ｂとの交差角度θは、４０°以下であることが好ましい。 In the flange members 12 and 13 before being welded to the molded bellows 11, the connecting portion 15 is continuous with the first surface 15a and the second surface 15b and is connected to the connecting portion 15 as shown in FIG. 2 (B). It has a third surface 15c that constitutes the tip end side of the. The distal end side of the thickness T F of the connecting portion 15, i.e. the height of the third surface 15c, the thickness dimension T B and comparable welded portion 11a (T F = T B, about 0.2mm~0.4mm ). Incidentally, it is the thickness T F of the distal end side of the connecting portion 15 and the thickness T B of the weld 11a, is set to be 0.8 ≦ (T B / T F ) ≦ 1.2 Is preferable. Further, the first surface 15a and the second surface 15b are provided with an intersection angle θ that narrows toward the tip of the connecting portion 15, and the intersection angle θ is about 30 °. The intersection angle θ between the first surface 15a and the second surface 15b is preferably 40 ° or less.

溶融固化部１４は、被溶接部１１ａおよび接続部１５の先端側からの電子ビーム溶接によって被溶接部１１ａおよび接続部１５の先端部を溶融、固化させることで形成され、周方向に連続した環状に形成されている。溶融固化部１４は、溶接時に溶融した金属が固化する際に、その表面張力によって球状に収縮することで断面円形に形成されている。溶融固化部１４の中心Ｏは、被溶接部１１ａと接続部１５の接触面（第一面１５ａ）の延長線上に位置し、溶融固化部１４の半径Ｒは、被溶接部１１ａの厚み寸法ＴBおよび接続部１５の先端部の厚み寸法ＴF以上であり、すなわち、溶融固化部１４の直径が被溶接部１１ａおよび接続部１５の先端側を合せた厚み寸法以上に形成されている。なお、溶融固化部１４は、被溶接部１１ａや接続部１５の先端にエッジが残らず、かつ滑らかに連続することが好ましく、そのために溶融固化部１４の直径は、被溶接部１１ａおよび接続部１５の先端側を合せた厚み寸法の１．１倍以上かつ１．６倍以下であることが好ましい。 The melt-solidified portion 14 is formed by melting and solidifying the tips of the welded portion 11a and the connecting portion 15 by electron beam welding from the tip side of the welded portion 11a and the connecting portion 15, and is formed as an annular shape continuous in the circumferential direction. Is formed in. The melt-solidified portion 14 is formed to have a circular cross section by contracting spherically due to its surface tension when the molten metal is solidified during welding. The center O of the melt-solidified portion 14 is located on an extension of the contact surface (first surface 15a) between the welded portion 11a and the connection portion 15, and the radius R of the melt-solidified portion 14 is the thickness dimension T of the welded portion 11a. The thickness of B and the tip of the connecting portion 15 is TF or more, that is, the diameter of the melt-solidified portion 14 is formed to be equal to or larger than the combined thickness of the welded portion 11a and the tip side of the connecting portion 15. The melt-solidified portion 14 preferably has no edges left at the tips of the welded portion 11a and the connecting portion 15 and is smoothly continuous. Therefore, the diameter of the melt-solidified portion 14 is the welded portion 11a and the connecting portion. It is preferable that the thickness is 1.1 times or more and 1.6 times or less the total thickness dimension of the tip side of 15.

次に、第１実施形態の溶接構造を用いた他のベローズについて、図３、図４に基づいて説明する。図３は、第１実施形態の溶接構造を用いたベローズ２０を示す断面図である。図４は、ベローズ２０の要部を示す拡大断面図であり、図３に丸囲み部Ａで示す位置の拡大図である。また、図４（Ａ）は溶接接合されたベローズ２０の要部を示し、図４（Ｂ）はベローズ２０の溶接接合前の状態を示している。 Next, another bellows using the welded structure of the first embodiment will be described with reference to FIGS. 3 and 4. FIG. 3 is a cross-sectional view showing a bellows 20 using the welded structure of the first embodiment. FIG. 4 is an enlarged cross-sectional view showing a main part of the bellows 20, and is an enlarged view of the position shown by the circled portion A in FIG. Further, FIG. 4A shows a main part of the bellows 20 welded and joined, and FIG. 4B shows a state of the bellows 20 before welding and joining.

図３、４に示すように、ベローズ２０は、金属ベローズである溶接ベローズ（可撓部材）２１と、溶接ベローズ２１の軸方向（図３に示す中心軸Ｘに沿った方向）両端に固定される一対のフランジ部材（対象部位）２２，２３と、を備えている。溶接ベローズ２１と一対のフランジ部材２２，２３とは、溶融固化部２４によって互いに溶接接合されている。 As shown in FIGS. 3 and 4, the bellows 20 are fixed to both ends of the weld bellows (flexible member) 21 which is a metal bellows and the axial direction (direction along the central axis X shown in FIG. 3) of the weld bellows 21. A pair of flange members (target portions) 22 and 23 are provided. The weld bellows 21 and the pair of flange members 22 and 23 are welded and joined to each other by the melt-solidified portion 24.

溶接ベローズ２１は、環状かつ断面波形の薄板材を２枚重ねにしたものを軸方向に複数並べて配置し、互いの内周縁と外周縁とを交互に溶接して溶接部２１ｂで接合することで、全体円筒状かつ蛇腹状に形成されている。薄板材の１枚あたりの厚み寸法は、０．１ｍｍ〜０．２ｍｍ程度であり、２枚重ねた薄板材の厚み寸法ｔ2は、０．２ｍｍ〜０．４ｍｍ程度になっている。溶接ベローズ２１の軸方向両端部には、図４に示すように、フランジ部材２２，２３の接続部２５に沿う被溶接部２１ａが設けられている。この被溶接部２１ａは、溶接ベローズ２１の軸方向両端部にて径方向の外側方向に延びるとともに、周方向に連続した環状に形成されている。被溶接部２１ａの厚み寸法ＴBは、２枚重ねた薄板材の厚み寸法ｔ2であり、０．２ｍｍ〜０．４ｍｍ程度となっている。 The weld bellows 21 is formed by arranging two layers of annular and corrugated thin plates arranged side by side in the axial direction, alternately welding the inner and outer peripheral edges of each other, and joining them at the welded portion 21b. , The whole is formed in a cylindrical shape and a bellows shape. The thickness dimension per sheet of the thin plate material is about 0.1 mm to 0.2 mm, and the thickness dimension t 2 of the two thin plate materials stacked is about 0.2 mm to 0.4 mm. As shown in FIG. 4, welded bellows 21 are provided with welded portions 21a along the connecting portions 25 of the flange members 22 and 23 at both ends in the axial direction. The welded bellows 21a extends outward in the radial direction at both ends in the axial direction of the welded bellows 21, and is formed in an annular shape continuous in the circumferential direction. Thickness T B of the welded portion 21a is a thickness t 2 of the 2-ply sheet material and on the order of 0.2 mm to 0.4 mm.

フランジ部材２２，２３は、全体円盤状に形成された板材からなり、その厚み寸法は溶接ベローズ２１の厚み寸法ｔ2と比較して十分に大きなものであり、可撓性を有した溶接ベローズ２１に対して実質的に剛体となっている。フランジ部材２２，２３における互いに対向する面２２ａ，２３ａの外周縁には、それぞれ溶接ベローズ２１が溶接される接続部２５が形成されている。接続部２５は、フランジ部材２２，２３の外周面から径方向の外側方向に突出するとともに、周方向に連続した環状に形成されている。また、接続部２５は、フランジ部材２２，２３の面２２ａ，２３ａと面一に連続する第一面２５ａと、その反対側の第二面２５ｂと、を有して突起状に形成されている。溶接ベローズ２１の被溶接部２１ａは、接続部２５の第一面２５ａに沿って設けられている。 The flange members 22 and 23 are made of a plate material formed in a disk shape as a whole, and the thickness dimension thereof is sufficiently larger than the thickness dimension t 2 of the weld bellows 21, and the weld bellows 21 has flexibility. However, it is substantially rigid. Connecting portions 25 to which the weld bellows 21 are welded are formed on the outer peripheral edges of the surfaces 22a and 23a of the flange members 22 and 23 that face each other. The connecting portion 25 projects outward in the radial direction from the outer peripheral surfaces of the flange members 22 and 23, and is formed in an annular shape continuous in the circumferential direction. Further, the connecting portion 25 has a first surface 25a that is continuous with the surfaces 22a and 23a of the flange members 22 and 23 and a second surface 25b on the opposite side thereof, and is formed in a protruding shape. .. The welded bellows 21's welded portion 21a is provided along the first surface 25a of the connecting portion 25.

溶接ベローズ２１と溶接接合される前のフランジ部材２２，２３において、接続部２５は、図４（Ｂ）に示すように、第一面２５ａおよび第二面２５ｂに連続し、かつ、接続部２５の先端側を構成する第三面２５ｃを有している。接続部２５の先端側の厚み寸法ＴF、つまり第三面２５ｃの高さ寸法は、被溶接部２１ａの厚み寸法ＴBと同程度（ＴF＝ＴB、０．２ｍｍ〜０．４ｍｍ程度）となっている。なお、被溶接部２１ａの厚み寸法ＴBと接続部２５の先端側の厚み寸法ＴFとは、０．８≦（ＴB／ＴF）≦１．２となるように設定されていることが好ましい。また、第一面２５ａと第二面２５ｂとは、接続部２５の先端に向かって狭まる交差角度θを有して設けられ、この交差角度θが３０°程度になっている。なお、第一面２５ａと第二面２５ｂとの交差角度θは、４０°以下であることが好ましい。 In the flange members 22 and 23 before being welded to the weld bellows 21, the connecting portion 25 is continuous with the first surface 25a and the second surface 25b and is connected to the connecting portion 25, as shown in FIG. 4 (B). It has a third surface 25c that constitutes the tip end side of the. The distal end side of the thickness T F of the connecting portion 25, i.e. the height of the third surface 25c, the thickness dimension T B and comparable welded portion 21a (T F = T B, about 0.2mm~0.4mm ). Incidentally, it is the thickness T F of the distal end side of the connecting portion 25 and the thickness T B of the weld 21a, is set to be 0.8 ≦ (T B / T F ) ≦ 1.2 Is preferable. Further, the first surface 25a and the second surface 25b are provided with an intersection angle θ that narrows toward the tip of the connecting portion 25, and the intersection angle θ is about 30 °. The intersection angle θ between the first surface 25a and the second surface 25b is preferably 40 ° or less.

溶融固化部２４は、被溶接部２１ａおよび接続部２５の先端側からの電子ビーム溶接によって被溶接部２１ａおよび接続部２５の先端部を溶融、固化させることで形成され、周方向に連続した環状に形成されている。溶融固化部２４は、溶接時に溶融した金属が固化する際に、その表面張力によって球状に収縮することで断面円形に形成されている。溶融固化部２４の中心Ｏは、被溶接部２１ａと接続部２５の接触面（第一面２５ａ）の延長線上に位置し、溶融固化部２４の半径Ｒは、被溶接部２１ａの厚み寸法ＴBおよび接続部２５の先端側の厚み寸法ＴF以上であり、すなわち、溶融固化部２４の直径が被溶接部２１ａおよび接続部２５の先端側を合せた厚み寸法以上に形成されている。なお、溶融固化部２４は、被溶接部２１ａや接続部２５の先端にエッジが残らず、かつ滑らかに連続することが好ましく、そのために溶融固化部２４の直径は、被溶接部２１ａおよび接続部２５の先端側を合せた厚み寸法の１．１倍以上かつ１．６倍以下であることが好ましい。 The melt-solidified portion 24 is formed by melting and solidifying the tips of the welded portion 21a and the connecting portion 25 by electron beam welding from the tip side of the welded portion 21a and the connecting portion 25, and is formed as an annular shape continuous in the circumferential direction. Is formed in. The melt-solidified portion 24 is formed to have a circular cross section by contracting spherically due to its surface tension when the molten metal is solidified during welding. The center O of the melt-solidified portion 24 is located on an extension of the contact surface (first surface 25a) between the welded portion 21a and the connection portion 25, and the radius R of the melt-solidified portion 24 is the thickness dimension T of the welded portion 21a. The thickness of B and the tip side of the connecting portion 25 is TF or more, that is, the diameter of the melt-solidified portion 24 is formed to be equal to or larger than the combined thickness dimension of the welded portion 21a and the tip side of the connecting portion 25. The melt-solidified portion 24 preferably has no edges left at the tips of the welded portion 21a and the connecting portion 25 and is smoothly continuous. Therefore, the diameter of the melt-solidified portion 24 is the welded portion 21a and the connecting portion. It is preferable that the thickness is 1.1 times or more and 1.6 times or less the total thickness of the tip side of 25.

次に、ベローズ１０，２０を構成する各部材の金属素材について説明する。成形ベローズ１１および溶接ベローズ２１は、主としてニッケル基合金から構成される。ニッケル基合金としては、耐熱性、耐蝕性、耐酸化性などに優れたインコネル（登録商標）が好適である。ニッケル基合金は、含有ニッケル量が５０％以上のものであって、ＮＣＦ６００、ＮＣＦ６０１、ＮＣＦ６２５、ＮＣＦ６９０（以上の記号は、JIS G 4902:1992耐食耐熱超合金板に基づく）が例示できる。 Next, the metal material of each member constituting the bellows 10 and 20 will be described. The molded bellows 11 and the welded bellows 21 are mainly composed of a nickel-based alloy. As the nickel-based alloy, Inconel (registered trademark) having excellent heat resistance, corrosion resistance, oxidation resistance and the like is suitable. The nickel-based alloy has a nickel content of 50% or more, and examples thereof include NCF600, NCF601, NCF625, and NCF690 (the above symbols are based on JIS G 4902: 1992 corrosion-resistant and heat-resistant superalloy plate).

フランジ部材１２，１３，２２，２３は、主としてオーステナイト系ステンレス鋼から構成される。オーステナイト系ステンレス鋼としては、ＳＵＳ３０４系のものが好適であるが、その中でも耐蝕性に優れたＳＵＳ３１６Ｌ、ＳＵＳ３１６ＬＮ、ＳＵＳ３２１、ＳＵＳ３４７が例示できる。なお、フランジ部材１２，１３，２２，２３の金属素材としてニッケル基合金や他の合金を用いてもよいし、成形ベローズ１１および溶接ベローズ２１の金属素材としてオーステナイト系ステンレス鋼や他の合金を用いてもよい。すなわち、成形ベローズ１１および溶接ベローズ２１の金属素材と、フランジ部材１２，１３，２２，２３の金属素材と、の溶接によって形成される溶融固化部１４，２４が主としてオーステナイト相となる組合せであればよく、このような異種金属素材の溶接に対して、本実施形態の溶接構造が好適に利用することができる。 The flange members 12, 13, 22, 23 are mainly composed of austenitic stainless steel. As the austenitic stainless steel, SUS304 stainless steel is preferable, and among them, SUS316L, SUS316LN, SUS321, and SUS347, which are excellent in corrosion resistance, can be exemplified. Nickel-based alloys and other alloys may be used as the metal materials for the flange members 12, 13, 22, and 23, and austenitic stainless steel and other alloys may be used as the metal materials for the molded bellows 11 and the welded bellows 21. You may. That is, if the combination is such that the melt-solidified portions 14, 24 formed by welding the metal materials of the molded bellows 11 and the weld bellows 21 and the metal materials of the flange members 12, 13, 22, 23 are mainly in the austenite phase. Often, the welded structure of the present embodiment can be suitably used for welding such dissimilar metal materials.

以上の本実施形態によれば、フランジ部材１２，１３，２２，２３の接続部１５，２５の先端側および成形ベローズ１１および溶接ベローズ２１の被溶接部１１ａ，２１ａの先端側の厚み寸法ＴF，ＴBが互いに同程度であり、このような接続部１５，２５および被溶接部１１ａ，２１ａの先端部に溶融固化部１４，２４が設けられ、接続部１５，２５の先端側および被溶接部１１ａ，２１ａを合せた厚み寸法以上の直径を有する断面円形に溶融固化部１４，２４が形成されている。このように互いに同程度の厚み寸法を有した接続部１５，２５および被溶接部１１ａ，２１ａの先端部同士を溶接することで、溶融した金属が表面張力で断面円形となり、凝固する過程で収縮したとしても、その収縮力が母材に作用しにくくなり、収縮による引張応力の発生を抑制することができる。従って、溶融固化部１４，２４が主としてオーステナイト相となる異種金属素材同士であり、溶融固化部１４，２４や周辺の母材に溶接割れが生じやすい条件であっても、溶接割れを防止することができ、残留応力を抑制することによって溶接耐久性を向上させることができる。 According to the above embodiment, the thickness dimension T F of the tip side of the connecting portions 15 and 25 of the flange members 12, 13, 22 and 23 and the tip side of the welded portions 11a and 21a of the molded bellows 11 and the welded bellows 21. , T B is comparable to each other, such connecting portions 15, 25 and the welded portion 11a, 21a of the tip melted and solidified portion 14, 24 is provided, the distal end side and the weld connecting portion 15 and 25 The melt-solidified portions 14 and 24 are formed in a circular cross section having a diameter equal to or larger than the combined thickness of the portions 11a and 21a. By welding the tips of the connecting portions 15, 25 and the welded portions 11a, 21a having the same thickness to each other in this way, the molten metal becomes circular in cross section due to surface tension and shrinks in the process of solidification. Even if this is done, the contraction force is less likely to act on the base metal, and the generation of tensile stress due to contraction can be suppressed. Therefore, even if the melt-solidified portions 14 and 24 are dissimilar metal materials mainly in the austenite phase and weld cracks are likely to occur in the melt-solidified portions 14 and 24 and the surrounding base material, the weld cracks should be prevented. Welding durability can be improved by suppressing residual stress.

また、溶融固化部１４，２４の直径が被溶接部１１ａ，２１ａおよび接続部１５，２５を合せた厚み寸法以上に形成されていることで、溶融固化部１４，２４と被溶接部１１ａ，２１ａおよび接続部１５，２５とを滑らかに連続させ、被溶接部１１ａ，２１ａや接続部１５，２５の先端にエッジが残らないようにでき、溶接部の溶接耐久性や力学特性を向上させることができる。 Further, since the diameters of the melt-solidified portions 14 and 24 are formed to be equal to or larger than the combined thickness of the welded portions 11a and 21a and the connecting portions 15 and 25, the melt-solidified portions 14 and 24 and the welded portions 11a and 21a are formed. And the connecting portions 15 and 25 can be smoothly connected so that no edge remains at the tips of the welded portions 11a and 21a and the connecting portions 15 and 25, and the welding durability and mechanical characteristics of the welded portion can be improved. it can.

また、接続部１５，２５における第一面１５ａ，２５ａと第二面１５ｂ，２５ｂとが先端に向かって狭まる約３０°の交差角度θで設けられていることで、溶融金属が凝固する際の収縮力が母材に与える影響を抑制し、接続部１５，２５周辺の溶接割れを防止することができる。 Further, since the first surfaces 15a and 25a and the second surfaces 15b and 25b of the connecting portions 15 and 25 are provided at an intersection angle θ of about 30 ° narrowing toward the tip, when the molten metal solidifies. It is possible to suppress the influence of the shrinkage force on the base metal and prevent welding cracks around the connecting portions 15 and 25.

また、成形ベローズ１１において、薄板材の端部を折り返して重ねた折返部によって被溶接部１１ａを構成することで、被溶接部１１ａの厚み寸法が大きくなり、溶接時の熱の影響や凝固する際の収縮力の影響を抑制し、被溶接部１１ａの溶接割れを防止することができる。 Further, in the molded bellows 11, the thickness dimension of the welded portion 11a is increased by forming the welded portion 11a by the folded portion in which the end portions of the thin plate materials are folded back and overlapped, and the thickness dimension of the welded portion 11a is increased, which is affected by heat during welding and solidifies. It is possible to suppress the influence of the shrinkage force at the time and prevent the weld crack of the welded portion 11a.

また、ベローズ１０，２０が弁装置に用いられる場合には、周方向に連続した溶融固化部１４，２４が形成され、この溶融固化部１４，２４周辺の溶接割れが防止されて溶接耐久性が向上することで、ベローズ１０，２０の良好なシール性が維持されることから弁装置の製品寿命を延ばすことができる。 Further, when the bellows 10 and 20 are used in the valve device, the melt-solidified portions 14 and 24 continuous in the circumferential direction are formed, and welding cracks around the melt-solidified portions 14 and 24 are prevented to improve the welding durability. By improving, the good sealing performance of the bellows 10 and 20 is maintained, so that the product life of the valve device can be extended.

次に、本発明の第２実施形態のベローズについて、図５、図６に基づいて説明する。図５は、第２実施形態の溶接構造を用いたベローズ３０を示す断面図である。図６は、ベローズ３０の要部を示す拡大断面図であり、図５に丸囲み部Ａで示す部分の拡大図である。また、図６（Ａ）は溶接接合されたベローズ３０の要部を示し、図６（Ｂ）はベローズ３０の溶接接合前の状態を示している。 Next, the bellows of the second embodiment of the present invention will be described with reference to FIGS. 5 and 6. FIG. 5 is a cross-sectional view showing a bellows 30 using the welded structure of the second embodiment. FIG. 6 is an enlarged cross-sectional view showing a main part of the bellows 30, and is an enlarged view of the part shown by the circled portion A in FIG. Further, FIG. 6A shows a main part of the bellows 30 welded and joined, and FIG. 6B shows a state of the bellows 30 before welding and joining.

図５、６に示すように、ベローズ３０は、金属ベローズである成形ベローズ（可撓部材）３１と、成形ベローズ３１の軸方向（図５に示す中心軸Ｘに沿った方向）両端に固定される一対のフランジ部材（対象部位）３２，３３と、を備えている。成形ベローズ３１と一対のフランジ部材３２，３３とは、溶融固化部３４によって互いに溶接接合されている。 As shown in FIGS. 5 and 6, the bellows 30 are fixed to both ends of the molded bellows (flexible member) 31 which is a metal bellows and the axial direction (direction along the central axis X shown in FIG. 5) of the molded bellows 31. A pair of flange members (target portions) 32 and 33 are provided. The molded bellows 31 and the pair of flange members 32, 33 are welded and joined to each other by the melt-solidified portion 34.

成形ベローズ３１は、前記第１実施形態の成形ベローズ１１と同様に、その軸方向両端部に被溶接部３１ａが設けられ、この被溶接部３１ａは、成形ベローズ３１の軸方向両端部にて径方向の内側方向に延びるとともに、周方向に連続した環状に形成されている。フランジ部材３２，３３は、それぞれ成形ベローズ３１が溶接される接続部３５を有している。接続部３５は、フランジ部材３２，３３の互いに対向する面３２ａ，３３ａの外周縁から径方向の内側方向に突出するとともに、周方向に連続した環状に形成されている。また、接続部３５は、面３２ａ，３３ａと面一に連続する第一面３５ａと、その反対側の第二面３５ｂと、接続部３５の先端側を構成する第三面３５ｃと、を有して突起状に形成されている。 Similar to the molded bellows 11 of the first embodiment, the molded bellows 31 is provided with welded portions 31a at both ends in the axial direction, and the welded portions 31a have diameters at both ends in the axial direction of the molded bellows 31. It extends inward in the direction and is formed in a ring shape continuous in the circumferential direction. The flange members 32 and 33 each have a connecting portion 35 to which the molded bellows 31 is welded. The connecting portion 35 protrudes inward in the radial direction from the outer peripheral edge of the surfaces 32a and 33a of the flange members 32 and 33 facing each other, and is formed in an annular shape continuous in the circumferential direction. Further, the connecting portion 35 has a first surface 35a that is continuous with the surfaces 32a and 33a, a second surface 35b on the opposite side thereof, and a third surface 35c that constitutes the tip end side of the connecting portion 35. It is formed in a protruding shape.

溶融固化部３４は、被溶接部３１ａおよび接続部３５の先端側からの電子ビーム溶接によって被溶接部３１ａおよび接続部３５の先端部を溶融、固化させることで形成され、周方向に連続した環状に形成されている。溶融固化部３４は、溶接時に溶融した金属が固化する際に、その表面張力によって球状に収縮することで断面円形に形成されている。この溶融固化部３４の直径は、被溶接部３１ａおよび接続部３５の先端側の厚み寸法ＴB，ＴFを合せた厚み寸法以上に形成されている。 The melt-solidified portion 34 is formed by melting and solidifying the tips of the welded portion 31a and the connecting portion 35 by electron beam welding from the tip side of the welded portion 31a and the connecting portion 35, and is formed as an annular shape continuous in the circumferential direction. Is formed in. The melt-solidified portion 34 is formed to have a circular cross section by contracting spherically due to its surface tension when the molten metal is solidified during welding. The diameter of the fused solidified portions 34 are formed over the thickness of the combined thickness T B of the distal end side of the welded portion 31a and the connecting portion 35, a T F.

以上の成形ベローズ３１、フランジ部材３２，３３および溶融固化部３４の形状および寸法は、前記第１実施形態と同様である。また、成形ベローズ３１およびフランジ部材３２，３３を構成する金属素材は、前記第１実施形態と同様であり、その溶接によって形成される溶融固化部３４が主としてオーステナイト相となる組合せである。このような第２実施形態のベローズ３０によれば、前記第１実施形態と同様の作用、効果を奏することができる。 The shapes and dimensions of the molded bellows 31, the flange members 32, 33, and the melt-solidified portion 34 are the same as those in the first embodiment. Further, the metal materials constituting the molded bellows 31 and the flange members 32 and 33 are the same as those in the first embodiment, and the melt-solidified portion 34 formed by welding thereof is a combination in which the austenite phase is mainly formed. According to the bellows 30 of the second embodiment, the same actions and effects as those of the first embodiment can be obtained.

次に、本発明の第３実施形態のベローズについて、図７、図８に基づいて説明する。図７は、第３実施形態の溶接構造を用いたベローズ４０を示す断面図である。図８は、ベローズ４０の要部を示す拡大断面図であり、図７に丸囲み部Ａで示す部分の拡大図である。また、図８（Ａ）は溶接接合されたベローズ４０の要部を示し、図８（Ｂ）はベローズ４０の溶接接合前の状態を示している。 Next, the bellows of the third embodiment of the present invention will be described with reference to FIGS. 7 and 8. FIG. 7 is a cross-sectional view showing a bellows 40 using the welded structure of the third embodiment. FIG. 8 is an enlarged cross-sectional view showing a main part of the bellows 40, and is an enlarged view of the part shown by the circled portion A in FIG. Further, FIG. 8A shows a main part of the bellows 40 welded and joined, and FIG. 8B shows a state of the bellows 40 before welding and joining.

図７、８に示すように、ベローズ４０は、金属ベローズである成形ベローズ（可撓部材）４１と、成形ベローズ４１の軸方向（図７に示す中心軸Ｘに沿った方向）両端に固定される一対のフランジ部材（対象部位）４２，４３と、を備えている。成形ベローズ４１と一対のフランジ部材４２，４３とは、溶融固化部４４によって互いに溶接接合されている。 As shown in FIGS. 7 and 8, the bellows 40 is fixed to both ends of the molded bellows (flexible member) 41 which is a metal bellows and the axial direction (direction along the central axis X shown in FIG. 7) of the molded bellows 41. A pair of flange members (target parts) 42 and 43 are provided. The molded bellows 41 and the pair of flange members 42, 43 are welded and joined to each other by the melt-solidified portion 44.

成形ベローズ４１は、前記第１実施形態の成形ベローズ１１と同様に、その軸方向両端部に被溶接部４１ａが設けられ、この被溶接部４１ａは、成形ベローズ４１の軸方向両端部にて軸方向の外側方向に延びるとともに、周方向に連続した環状に形成されている。フランジ部材４２，４３は、それぞれ成形ベローズ４１が溶接される接続部４５を有している。接続部４５は、フランジ部材４２，４３の内周側にて径方向に対向する面４２ａ，４３ａから軸方向の外側方向に突出するとともに、周方向に連続した環状に形成されている。また、接続部４５は、面４２ａ，４３ａと面一に連続する第一面４５ａと、その反対側の第二面４５ｂと、接続部４５の先端側を構成する第三面４５ｃと、を有して突起状に形成されている。 Similar to the molded bellows 11 of the first embodiment, the molded bellows 41 is provided with welded portions 41a at both ends in the axial direction, and the welded portions 41a are shafted at both ends in the axial direction of the molded bellows 41. It extends outward in the direction and is formed in a ring shape continuous in the circumferential direction. The flange members 42 and 43 each have a connecting portion 45 to which the molded bellows 41 is welded. The connecting portion 45 projects outward in the axial direction from the surfaces 42a and 43a facing in the radial direction on the inner peripheral side of the flange members 42 and 43, and is formed in an annular shape continuous in the circumferential direction. Further, the connecting portion 45 has a first surface 45a that is continuous with the surfaces 42a and 43a, a second surface 45b on the opposite side thereof, and a third surface 45c that constitutes the tip end side of the connecting portion 45. It is formed in a protruding shape.

溶融固化部４４は、被溶接部４１ａおよび接続部４５の先端側からの電子ビーム溶接によって被溶接部４１ａおよび接続部４５の先端部を溶融、固化させることで形成され、周方向に連続した環状に形成されている。溶融固化部４４は、溶接時に溶融した金属が固化する際に、その表面張力によって球状に収縮することで断面円形に形成されている。この溶融固化部４４の直径は、被溶接部４１ａおよび接続部４５の先端側の厚み寸法ＴB，ＴFを合せた厚み寸法以上に形成されている。 The melt-solidified portion 44 is formed by melting and solidifying the tips of the welded portion 41a and the connecting portion 45 by electron beam welding from the tip side of the welded portion 41a and the connecting portion 45, and is formed as an annular shape continuous in the circumferential direction. Is formed in. The melt-solidified portion 44 is formed to have a circular cross section by contracting spherically due to its surface tension when the molten metal is solidified during welding. The diameter of the fused solidified portions 44 are formed over the thickness of the combined thickness T B of the distal end side of the welded portion 41a and the connecting portion 45, a T F.

以上の成形ベローズ４１、フランジ部材４２，４３および溶融固化部４４の形状および寸法は、前記第１実施形態と同様である。また、成形ベローズ４１およびフランジ部材４２，４３を構成する金属素材は、前記第１実施形態と同様であり、その溶接によって形成される溶融固化部４４が主としてオーステナイト相となる組合せである。このような第３実施形態のベローズ４０によれば、前記第１実施形態と略同様の作用、効果を奏することができる。 The shapes and dimensions of the molded bellows 41, the flange members 42, 43, and the melt-solidified portion 44 are the same as those in the first embodiment. Further, the metal materials constituting the molded bellows 41 and the flange members 42 and 43 are the same as those in the first embodiment, and the melt-solidified portion 44 formed by the welding thereof is a combination mainly in the austenite phase. According to the bellows 40 of the third embodiment, it is possible to obtain substantially the same actions and effects as those of the first embodiment.

次に、本発明の溶接構造を用いた弁装置について、図９を参照して説明する。図９は、本発明の溶接構造を用いた弁装置であるベローズ弁５０を示す断面図である。ベローズ弁５０は、図９に示すように、内部に弁室５１を有する弁本体５２と、弁本体５２に進退自在に設けられた弁体５３と、弁体５３を進退移動させるために回転操作される操作部５４と、弁室５１をシールする可撓部材としてのベローズ５５と、を備えた手動開閉タイプのバルブである。 Next, a valve device using the welded structure of the present invention will be described with reference to FIG. FIG. 9 is a cross-sectional view showing a bellows valve 50, which is a valve device using the welded structure of the present invention. As shown in FIG. 9, the bellows valve 50 has a valve body 52 having a valve chamber 51 inside, a valve body 53 provided in the valve body 52 so as to be able to move forward and backward, and a rotation operation for moving the valve body 53 forward and backward. It is a manual opening / closing type valve including an operation unit 54 to be operated and a bellows 55 as a flexible member for sealing the valve chamber 51.

弁本体５２は、互いに螺合される第１部材５２ａおよび第２部材５２ｂと、第１部材５２ａの内部に固定されて弁体５３を進退案内するガイド部材５２ｃと、を備えている。第１部材５２ａは、その一端側に開口して弁室５１に連通する流入ポート５２ｄと、他端側に開口して弁室５１に連通する流出ポート５２ｅと、流出ポート５２ｅが弁室５１に開口した開口である弁ポート５２ｆと、を備える。第２部材５２ｂは、全体円筒状に形成され、操作部５４の軸部５４ｂを回転支持する軸受部５２ｇと、軸受部５２ｇと軸部５４ｂとの間をシールするパッキン５２ｈと、を備えて構成されている。 The valve body 52 includes a first member 52a and a second member 52b that are screwed together, and a guide member 52c that is fixed inside the first member 52a and guides the valve body 53 forward and backward. The first member 52a has an inflow port 52d that opens on one end side and communicates with the valve chamber 51, an outflow port 52e that opens on the other end side and communicates with the valve chamber 51, and an outflow port 52e that communicates with the valve chamber 51. A valve port 52f, which is an open opening, is provided. The second member 52b is formed on the entire cylindrical, provided with a bearing portion 52g of the shaft portion 54 b for rotatably supporting the operating part 54, a packing 52h for sealing between the bearing portion 52g and a shaft portion 54 b, the It is composed of.

弁体５３は、軸方向（図９に示す中心軸Ｘに沿った方向）に延びる全体円柱状に形成され、ガイド部材５２ｃによって軸方向に進退案内されるようになっている。弁体５３の上部は円筒状とされ、その内周面に雌ねじ部５３ａが形成されている。弁体５３の下端部には連結部材５３ｂが固定され、この連結部材５３ｂの下面には、弁ポート５２ｆに着座可能な弁部材５３ｃが取り付けられている。 The valve body 53 is formed in an overall columnar shape extending in the axial direction (direction along the central axis X shown in FIG. 9), and is guided forward and backward in the axial direction by the guide member 52c. The upper part of the valve body 53 has a cylindrical shape, and a female screw portion 53a is formed on the inner peripheral surface thereof. A connecting member 53b is fixed to the lower end of the valve body 53, and a valve member 53c that can be seated on the valve port 52f is attached to the lower surface of the connecting member 53b.

操作部５４は、ハンドル５４ａと、ハンドル５４ａに上端部が固定されて軸方向に延びる軸部５４ｂと、を備え、弁本体５２の軸受部５２ｇに回転支持されている。軸部５４ｂの外周面には雄ねじ部５４ｃが形成され、この雄ねじ部５４ｃと弁体５３の雌ねじ部５３ａとが螺合されている。従って、ハンドル５４ａの回転操作により、回転する雄ねじ部５４ｃと螺合した雌ねじ部５３ａに上下方向の駆動力が作用し、弁体５３が上下に進退駆動される送りねじ機構が構成されている。 The operation unit 54 includes a handle 54a and a shaft portion 54b whose upper end is fixed to the handle 54a and extends in the axial direction, and is rotationally supported by a bearing portion 52g of the valve body 52. A male threaded portion 54c is formed on the outer peripheral surface of the shaft portion 54b, and the male threaded portion 54c and the female threaded portion 53a of the valve body 53 are screwed together. Therefore, a feed screw mechanism is configured in which a driving force in the vertical direction acts on the female screw portion 53a screwed with the rotating male screw portion 54c by the rotation operation of the handle 54a, and the valve body 53 is driven forward and backward.

ベローズ５５は、成形ベローズ５５ａを有し、この成形ベローズ５５ａがフランジ部材としてのガイド部材５２ｃと弁体５３との間に固定されている。具体的には、弁体５３の上端部に一方の接続部５６が形成され、ガイド部材５２ｃの上端部に他方の接続部５６が形成され、これら上下の接続部５６と成形ベローズ５５ａの上下端縁とがそれぞれ溶融固化部５７によって溶接接合されている。このようなベローズ５５の溶接構造は、前記第１実施形態のベローズ１０と同様であり、溶融固化部５７が周方向に連続して設けられることでシール性を有している。従って、ガイド部材５２ｃの内部を通して弁室５１と連通する内部空間と、ベローズ５５の外側である弁本体５２の第２部材５２ｂの内部空間と、がベローズ５５によってシールされている。 The bellows 55 has a molded bellows 55a, and the molded bellows 55a is fixed between the guide member 52c as a flange member and the valve body 53. Specifically, one connecting portion 56 is formed at the upper end portion of the valve body 53, the other connecting portion 56 is formed at the upper end portion of the guide member 52c, and the upper and lower connecting portions 56 and the upper and lower ends of the molded bellows 55a are formed. The edges are welded and joined by the melt-solidified portion 57, respectively. The welded structure of the bellows 55 is the same as that of the bellows 10 of the first embodiment, and the melt-solidified portion 57 is continuously provided in the circumferential direction to have a sealing property. Therefore, the internal space that communicates with the valve chamber 51 through the inside of the guide member 52c and the internal space of the second member 52b of the valve body 52 that is outside the bellows 55 are sealed by the bellows 55.

以上のベローズ弁５０では、操作部５４のハンドル５４ａが回転操作されることで、雄ねじ部５４ｃおよび雌ねじ部５３ａの送りねじ機構によって、下方に移動して弁部材５３ｃが弁ポート５２ｅに着座する弁閉位置と、上方に移動して弁部材５３ｃが弁ポート５２ｅから離座する弁閉位置と、の間を上下方向に弁体５３が進退移動するようになっている。このような弁体５３の移動に伴い、ベローズ５５の成形ベローズ５５ａは、上下に伸縮して弁体３３の移動に追従し、シール性が維持されるようになっている。 In the bellows valve 50 described above, when the handle 54a of the operating portion 54 is rotated, the valve member 53c moves downward by the feed screw mechanism of the male threaded portion 54c and the female threaded portion 53a, and the valve member 53c is seated on the valve port 52e. The valve body 53 moves up and down between the closed position and the valve closed position where the valve member 53c moves upward and separates from the valve port 52e. With such movement of the valve body 53, the molded bellows 55a of the bellows 55 expands and contracts up and down to follow the movement of the valve body 33, and the sealing property is maintained.

以上のベローズ弁５０において、成形ベローズ５５ａ、弁体５３およびガイド部材５２ｃの接続部５６、および溶融固化部５７の形状および寸法は、前記第１実施形態の溶接構造と同様である。また、成形ベローズ５５ａ、弁体５３およびガイド部材５２ｃを構成する金属素材は、前記第１実施形態と同様であり、その溶接によって形成される溶融固化部５７が主としてオーステナイト相となる組合せである。このようなベローズ弁５０によれば、成形ベローズ５５ａと弁体５３およびガイド部材５２ｃの接続部５６とが溶融固化部５７によって溶接された溶接構造は、前記第１実施形態と略同様の作用、効果を奏することができる。すなわち、溶融固化部５７が主としてオーステナイト相となる異種金属素材同士であっても、溶接割れを防止することができ、残留応力を抑制することによって溶接耐久性を向上させることができる。従って、ベローズ５５の良好なシール性が維持されることからベローズ弁５０の製品寿命を延ばすことができる。 In the above bellows valve 50, the shapes and dimensions of the molded bellows 55a, the connecting portion 56 of the valve body 53 and the guide member 52c, and the melt-solidified portion 57 are the same as those of the welded structure of the first embodiment. Further, the metal materials constituting the molded bellows 55a, the valve body 53 and the guide member 52c are the same as those in the first embodiment, and the melt-solidified portion 57 formed by the welding thereof is a combination mainly in the austenite phase. According to such a bellows valve 50, the welded structure in which the molded bellows 55a, the valve body 53, and the connecting portion 56 of the guide member 52c are welded by the melt-solidified portion 57 has substantially the same operation as that of the first embodiment. It can be effective. That is, even if the molten and solidified portions 57 are dissimilar metal materials mainly in the austenite phase, welding cracking can be prevented, and welding durability can be improved by suppressing residual stress. Therefore, since the good sealing property of the bellows 55 is maintained, the product life of the bellows valve 50 can be extended.

次に、本発明の溶接構造を用いた他の弁装置について、図１０、１１を参照して説明する。図１０は、本発明の溶接構造を用いた他の弁装置であるダイヤフラム弁６０を示す断面図である。図１１（Ａ），（Ｂ）は、ダイヤフラム弁６０の要部を示す拡大断面図である。ダイヤフラム弁６０は、図１０に示すように、内部に弁室６１を有する弁本体６２と、弁室６１内に設けられた弁体６３と、弁体６３を進退移動させるために回転操作される操作部６４と、弁室６１をシールする可撓部材としての金属ダイヤフラム６５と、を備えた手動開閉タイプのバルブである。弁本体６２は、互いに螺合される第１部材６２ａおよび第２部材６２ｂを備えている。 Next, another valve device using the welded structure of the present invention will be described with reference to FIGS. 10 and 11. FIG. 10 is a cross-sectional view showing a diaphragm valve 60, which is another valve device using the welded structure of the present invention. 11 (A) and 11 (B) are enlarged cross-sectional views showing a main part of the diaphragm valve 60. As shown in FIG. 10, the diaphragm valve 60 is rotated to move the valve body 62 having the valve chamber 61 inside, the valve body 63 provided in the valve chamber 61, and the valve body 63 forward and backward. It is a manual opening / closing type valve including an operation unit 64 and a metal diaphragm 65 as a flexible member for sealing the valve chamber 61. The valve body 62 includes a first member 62a and a second member 62b that are screwed together.

弁本体６２の第１部材６２ａは、その一端側に開口して弁室６１に連通する流入ポート６２ｃと、他端側に開口して弁室６１に連通する流出ポート６２ｄと、流入ポート６２ｃが弁室６１に開口した開口である弁ポート６２ｅと、を備える。弁本体６２の第２部材６２ｂは、全体円筒状に形成され、操作部６４の軸部６４ｂを回転支持する軸受部６２ｆと、軸部６４ｂの雄ねじ部６４ｃと螺合する雌ねじ部６２ｇと、を備えて構成されている。また、第１部材６２ａの弁室６１内には、全体円筒状に立ち上がり金属ダイヤフラム６５を固定するための対象部位としての固定部６２ｈが形成されている。 The first member 62a of the valve body 62 has an inflow port 62c that opens to one end side and communicates with the valve chamber 61, an outflow port 62d that opens to the other end side and communicates with the valve chamber 61, and an inflow port 62c. A valve port 62e, which is an opening opened in the valve chamber 61, is provided. The second member 62b of the valve body 62 is formed in a cylindrical shape as a whole, and has a bearing portion 62f that rotationally supports the shaft portion 64b of the operation portion 64 and a female screw portion 62g that is screwed with the male screw portion 64c of the shaft portion 64b. It is configured to prepare. Further, in the valve chamber 61 of the first member 62a, a fixing portion 62h is formed as a target portion for fixing the metal diaphragm 65 that rises in a cylindrical shape as a whole.

弁体６３は、下方に開口した円筒箱状の弁体ケース６３ａと、弁体ケース６３ａの内部に保持された弁部材６３ｂと、弁本体６２に対して弁体ケース６３ａおよび弁部材６３ｂを弁開方向（図１０の上方）に付勢するばね部材６３ｃと、を有して構成されている。弁体ケース６３ａは、その上面に凸部を有し、この凸部が金属ダイヤフラム６５の下面に当接して設けられ、ばね部材６３ｃの付勢力によって金属ダイヤフラム６５を上方に変位させる。弁部材６３ｂは、樹脂製やゴム製のパッキンであって、弁ポート６２ｅに着座して密閉可能に構成されている。 The valve body 63 has a cylindrical box-shaped valve body case 63a that opens downward, a valve member 63b held inside the valve body case 63a, and a valve body case 63a and a valve member 63b with respect to the valve body 62. It is configured to have a spring member 63c that biases in the opening direction (upper part of FIG. 10). The valve body case 63a has a convex portion on the upper surface thereof, and the convex portion is provided in contact with the lower surface of the metal diaphragm 65, and the metal diaphragm 65 is displaced upward by the urging force of the spring member 63c. The valve member 63b is a packing made of resin or rubber, and is configured to be seated on the valve port 62e and hermetically sealed.

操作部６４は、ハンドル６４ａと、ハンドル６４ａに上端部が固定されて軸方向に延びる軸部６４ｂと、軸部６４ｂよりも下方に設けられた雄ねじ部６４ｃと、雄ねじ部６４ｃよりもさらに下方の先端部に設けられた当接部６４ｄと、を備える。軸部６４ｂは、弁本体５２の軸受部６２ｆに回転支持され、雄ねじ部６４ｃは、雌ねじ部６２ｇに螺合されている。当接部６４ｄは、弁体６３の反対側から金属ダイヤフラム６５に当接して設けられている。 The operation unit 64 includes a handle 64a, a shaft portion 64b whose upper end is fixed to the handle 64a and extends in the axial direction, a male screw portion 64c provided below the shaft portion 64b, and a male screw portion 64c further below the male screw portion 64c. It is provided with a contact portion 64d provided at the tip portion. The shaft portion 64b is rotationally supported by the bearing portion 62f of the valve body 52, and the male screw portion 64c is screwed into the female screw portion 62g. The contact portion 64d is provided in contact with the metal diaphragm 65 from the opposite side of the valve body 63.

このようなダイヤフラム弁６０では、ハンドル６４ａの回転操作により、雌ねじ部６２ｇに雄ねじ部６４ｃが案内されて操作部６４が上下に進退移動し、当接部６４ｄと当接した金属ダイヤフラム６５が面外方向に撓んで上下に変位し、金属ダイヤフラム６５の変位に伴って弁体６３が上下に移動する。すなわち、弁体６３は、下方に移動して弁部材６３ｂが弁ポート６２ｅに着座する弁閉位置と、上方に移動して弁部材６３ｂが弁ポート６２ｅから離座する弁開位置と、の間を上下方向に進退移動するようになっている。 In such a diaphragm valve 60, the male screw portion 64c is guided by the female screw portion 62g by the rotation operation of the handle 64a, the operation portion 64 moves up and down, and the metal diaphragm 65 in contact with the contact portion 64d is out of the plane. It bends in the direction and displaces up and down, and the valve body 63 moves up and down with the displacement of the metal diaphragm 65. That is, the valve body 63 is between a valve closing position where the valve member 63b moves downward and seats on the valve port 62e and a valve opening position where the valve member 63b moves upward and leaves the valve port 62e. Is designed to move forward and backward in the vertical direction.

次に、図１１を参照して金属ダイヤフラム６５と弁本体６２の固定部６２ｈとの溶接構造について説明する。金属ダイヤフラム６５は、全体円形板状（皿状）の薄板材から構成され、その厚み寸法は、０．２ｍｍ〜０．４ｍｍ程度である。金属ダイヤフラム６５の外周縁には、径方向の外側方向に延びるとともに周方向に連続した環状の被溶接部６５ａが設けられている。被溶接部６５ａの厚み寸法ＴBは、金属ダイヤフラム６５の厚み寸法と略同一の０．２ｍｍ〜０．４ｍｍ程度となっている。被溶接部６５ａは、固定部６２ｈの上面に沿って設けられている。 Next, the welded structure between the metal diaphragm 65 and the fixing portion 62h of the valve body 62 will be described with reference to FIG. The metal diaphragm 65 is made of a thin plate material having an overall circular plate shape (dish shape), and its thickness dimension is about 0.2 mm to 0.4 mm. An annular welded portion 65a extending outward in the radial direction and continuous in the circumferential direction is provided on the outer peripheral edge of the metal diaphragm 65. Thickness T B of the welded portion 65a are substantially the same of about 0.2mm~0.4mm and thickness of the metal diaphragm 65. The welded portion 65a is provided along the upper surface of the fixed portion 62h.

固定部６２ｈには、その上面が径方向の外側方向に突出した接続部６７が周方向に連続した環状に形成されている。接続部６７は、図１１（Ｂ）に示すように、固定部６２ｈの上面に連続する第一面６７ａと、その反対側（下側）の第二面６７ｂと、接続部６７の先端側を構成する第三面６７ｃと、を有して突起状に形成されている。接続部６７の先端側の厚み寸法ＴF、つまり第三面６７ｃの高さ寸法は、被溶接部６５ａの厚み寸法ＴBと同程度（ＴF＝ＴB、０．２ｍｍ〜０．４ｍｍ程度）となっている。なお、被溶接部６５ａの厚み寸法ＴBと接続部６７の先端側の厚み寸法ＴFとは、０．８≦（ＴB／ＴF）≦１．２となるように設定されていることが好ましい。また、第一面６７ａと第二面６７ｂとは、接続部６７の先端に向かって狭まる交差角度θを有して設けられ、この交差角度θが３０°程度になっている。なお、第一面６７ａと第二面６７ｂとの交差角度θは、４０°以下であることが好ましい。 In the fixed portion 62h, a connecting portion 67 whose upper surface protrudes outward in the radial direction is formed in an annular shape continuous in the circumferential direction. As shown in FIG. 11B, the connecting portion 67 has a first surface 67a continuous with the upper surface of the fixing portion 62h, a second surface 67b on the opposite side (lower side), and a tip end side of the connecting portion 67. It has a third surface 67c and is formed in a protruding shape. The distal end side of the thickness T F of the connecting portion 67, i.e. the height of the third surface 67c, the thickness dimension T B and comparable welded portion 65a (T F = T B, about 0.2mm~0.4mm ). Incidentally, it is the distal end side of the thickness T F of the connecting portion 67 and the thickness T B of the weld 65a, is set to be 0.8 ≦ (T B / T F ) ≦ 1.2 Is preferable. Further, the first surface 67a and the second surface 67b are provided with an intersection angle θ that narrows toward the tip of the connecting portion 67, and the intersection angle θ is about 30 °. The intersection angle θ between the first surface 67a and the second surface 67b is preferably 40 ° or less.

金属ダイヤフラム６５の被溶接部６５ａと弁本体６２の接続部６７とが溶融固化部６８によって溶接接合されている。溶融固化部６８は、被溶接部６５ａおよび接続部６７の先端側からの電子ビーム溶接によって被溶接部６５ａおよび接続部６７の先端部を溶融、固化させることで形成され、周方向に連続した環状に形成されている。溶融固化部６８は、溶接時に溶融した金属が固化する際に、その表面張力によって球状に収縮することで断面円形に形成されている。溶融固化部６８の中心Ｏは、被溶接部６５ａと接続部６７の接触面（第一面６７ａ）の延長線上に位置し、溶融固化部６８の半径Ｒは、被溶接部６５ａの厚み寸法ＴBおよび接続部６７の先端側の厚み寸法ＴF以上であり、すなわち、溶融固化部６８の直径が被溶接部６５ａおよび接続部６７の先端側を合せた厚み寸法以上に形成されている。なお、溶融固化部６８は、被溶接部６５ａや接続部６７の先端にエッジが残らず、かつ滑らかに連続することが好ましく、そのために溶融固化部６８の直径は、被溶接部６５ａおよび接続部６７の先端側を合せた厚み寸法の１．１倍以上かつ１．６倍以下であることが好ましい。 The welded portion 65a of the metal diaphragm 65 and the connecting portion 67 of the valve body 62 are welded and joined by the melt-solidified portion 68. The melt-solidified portion 68 is formed by melting and solidifying the tips of the welded portion 65a and the connecting portion 67 by electron beam welding from the tip side of the welded portion 65a and the connecting portion 67, and is formed as an annular shape continuous in the circumferential direction. Is formed in. The melt-solidified portion 68 is formed to have a circular cross section by contracting spherically due to its surface tension when the molten metal is solidified during welding. The center O of the melt-solidified portion 68 is located on an extension of the contact surface (first surface 67a) between the welded portion 65a and the connecting portion 67, and the radius R of the melt-solidified portion 68 is the thickness dimension T of the welded portion 65a. The thickness of B and the tip side of the connecting portion 67 is TF or more, that is, the diameter of the melt-solidified portion 68 is formed to be equal to or larger than the combined thickness dimension of the welded portion 65a and the tip side of the connecting portion 67. The melt-solidified portion 68 preferably has no edges left at the tips of the welded portion 65a and the connecting portion 67 and is smoothly continuous. Therefore, the diameter of the melt-solidified portion 68 is the welded portion 65a and the connecting portion. It is preferable that the thickness dimension of 67 including the tip side is 1.1 times or more and 1.6 times or less.

以上のダイヤフラム弁６０を構成する各部材の金属素材として、金属ダイヤフラム６５は、前記第１実施形態の成形ベローズ１１および溶接ベローズ２１と同様に、主としてニッケル基合金から構成され、弁本体６２は、前記第１実施形態のフランジ部材１２，１３，２２，２３と同様に、主としてオーステナイト系ステンレス鋼から構成される。なお、金属素材の組合せとしては、金属ダイヤフラム６５の金属素材と、弁本体６２の金属素材と、の溶接によって形成される溶融固化部６８が主としてオーステナイト相となる組合せであればよく、このような異種金属素材の溶接に対して、本発明の溶接構造が好適に利用することができる。 As the metal material of each member constituting the diaphragm valve 60, the metal diaphragm 65 is mainly composed of a nickel-based alloy as in the case of the molded bellows 11 and the welded bellows 21 of the first embodiment, and the valve body 62 is composed of a nickel-based alloy. Similar to the flange members 12, 13, 22, 23 of the first embodiment, it is mainly composed of austenitic stainless steel. The combination of the metal materials may be any combination in which the melt-solidified portion 68 formed by welding the metal material of the metal diaphragm 65 and the metal material of the valve body 62 is mainly in the austenite phase. The welded structure of the present invention can be preferably used for welding dissimilar metal materials.

なお、ダイヤフラム弁６０は、金属ダイヤフラムの外周縁が弁本体の固定部６２ｈに固定されるものに限らず、金属ダイヤフラムの中央部に形成された挿通孔を弁体の軸部が貫通するとともに、挿通孔の内周縁と弁体の軸部とが溶接接合される構成のダイヤフラム弁であってもよい。この場合、金属ダイヤフラムの挿通孔の内周縁に被溶接部が設けられ、弁体の軸部に接続部が設けられ、これらの被溶接部および接続部の先端部同士が溶融固化部によって接合されていればよい。そのような溶接構造としては前記各実施形態と同様の構造が採用可能である。 The diaphragm valve 60 is not limited to the one in which the outer peripheral edge of the metal diaphragm is fixed to the fixing portion 62h of the valve body, and the shaft portion of the valve body penetrates the insertion hole formed in the central portion of the metal diaphragm. It may be a diaphragm valve having a structure in which the inner peripheral edge of the insertion hole and the shaft portion of the valve body are welded and joined. In this case, a welded portion is provided on the inner peripheral edge of the insertion hole of the metal diaphragm, a connecting portion is provided on the shaft portion of the valve body, and the welded portion and the tip portion of the connecting portion are joined by the melt-solidified portion. You just have to. As such a welded structure, a structure similar to that of each of the above-described embodiments can be adopted.

以上のダイヤフラム弁６０によれば、金属ダイヤフラム６５の被溶接部６５ａの先端側および弁本体６２の接続部６７の先端側の厚み寸法ＴF，ＴBが互いに同程度であり、このような被溶接部６５ａおよび接続部６７の先端部に溶融固化部６８が設けられ、被溶接部６５ａおよび接続部６７の先端側を合せた厚み寸法以上の直径を有する断面円形に溶融固化部６８が形成されている。このように互いに同程度の厚み寸法を有した被溶接部６５ａおよび接続部６７の先端部同士を溶接することで、溶融した金属が表面張力で断面円形となり、凝固する過程で収縮したとしても、その収縮力が母材に作用しにくくなり、収縮による引張応力の発生を抑制することができる。従って、溶融固化部６８が主としてオーステナイト相となる異種金属素材同士であり、溶融固化部６８や周辺の母材に溶接割れが生じやすい条件であっても、溶接割れを防止することができ、残留応力を抑制することによって溶接耐久性を向上させることができる。 According to the above diaphragm valve 60, a distal end and distal of the thickness T F of the connecting portion 67 of the valve body 62, T B is the same degree to one another of the welding portion 65a of the metal diaphragm 65, such the A melt-solidified portion 68 is provided at the tip of the welded portion 65a and the connecting portion 67, and the melt-solidified portion 68 is formed in a circular cross section having a diameter equal to or larger than the combined thickness dimension of the welded portion 65a and the tip side of the connecting portion 67. ing. By welding the tips of the welded portion 65a and the connecting portion 67 having the same thickness to each other in this way, the molten metal has a circular cross section due to surface tension, and even if it shrinks in the process of solidification. The shrinkage force is less likely to act on the base metal, and the generation of tensile stress due to shrinkage can be suppressed. Therefore, even under conditions in which the melt-solidified portion 68 is a dissimilar metal material mainly in the austenite phase and weld cracks are likely to occur in the melt-solidified portion 68 and the surrounding base material, welding cracks can be prevented and residual. Welding durability can be improved by suppressing stress.

また、溶融固化部６８の直径が被溶接部６５ａおよび接続部６７の先端側を合せた厚み寸法以上に形成されていることで、溶融固化部６８と被溶接部６５ａおよび接続部６７とを滑らかに連続させ、被溶接部６５ａや接続部６７の先端にエッジが残らないようにでき、溶接部の溶接耐久性や力学特性を向上させることができる。 Further, since the diameter of the melt-solidified portion 68 is formed to be equal to or larger than the combined thickness dimension of the welded portion 65a and the tip end side of the connecting portion 67, the melt-solidified portion 68, the welded portion 65a, and the connecting portion 67 are smoothed. It is possible to prevent an edge from remaining at the tip of the welded portion 65a or the connecting portion 67, and it is possible to improve the welding durability and mechanical characteristics of the welded portion.

また、接続部６７における第一面６７ａと第二面６７ｂとが先端に向かって狭まる４０°以下の交差角度θで設けられていることで、溶融金属が凝固する際の収縮力が母材に与える影響を抑制し、接続部６７周辺の溶接割れを防止することができる。 Further, since the first surface 67a and the second surface 67b of the connecting portion 67 are provided at an intersection angle θ of 40 ° or less that narrows toward the tip, the shrinkage force when the molten metal solidifies becomes a base material. It is possible to suppress the influence and prevent welding cracks around the connection portion 67.

また、ダイヤフラム弁６０の金属ダイヤフラム６５において、周方向に連続した溶融固化部６８が形成され、この溶融固化部６８周辺の溶接割れが防止されて溶接耐久性が向上することで、金属ダイヤフラム６５の良好なシール性が維持されることからダイヤフラム弁６０の製品寿命を延ばすことができる。 Further, in the metal diaphragm 65 of the diaphragm valve 60, a melt-solidified portion 68 continuous in the circumferential direction is formed, welding cracks around the melt-solidified portion 68 are prevented, and welding durability is improved, so that the metal diaphragm 65 Since good sealing performance is maintained, the product life of the diaphragm valve 60 can be extended.

なお、本発明は、前記実施形態に限定されるものではなく、本発明の目的が達成できる他の構成等を含み、以下に示すような変形等も本発明に含まれる。例えば、前記実施形態では、本発明の溶接構造を適用する装置として、弁装置を例示したが、本発明の溶接構造は、弁装置に限らず、冷凍空調装置や配管継手、カプラ、ポンプ、圧力スイッチ等にも適用可能である。 The present invention is not limited to the above-described embodiment, but includes other configurations and the like that can achieve the object of the present invention, and the following modifications and the like are also included in the present invention. For example, in the above-described embodiment, a valve device is exemplified as a device to which the welded structure of the present invention is applied, but the welded structure of the present invention is not limited to the valve device, but is not limited to the valve device, but is a refrigerating / air-conditioning device, a pipe joint, a coupler, a pump, and a pressure. It can also be applied to switches and the like.

また、前記実施形態では、可撓部材として成形ベローズ１１，３１，４１，５５ａ、溶接ベローズ２１および金属ダイヤフラム６５を例示したが、本発明の溶接構造を適用する可撓部材としては任意のものが選択可能である。 Further, in the above embodiment, molded bellows 11, 31, 41, 55a, welded bellows 21 and metal diaphragm 65 are exemplified as the flexible member, but any flexible member to which the welded structure of the present invention is applied can be used. It is selectable.

また、前記実施形態では、可撓部材と対象部位の金属素材として、ニッケル基合金とオーステナイト系ステンレス鋼との組合せを例示したが、本発明の溶接構造が適用できる金属素材の組合せとしては、溶融固化部が主としてオーステナイト相となる異種金属素材であればよく、前記実施形態のものに限定されない。また、可撓部材の被溶接部および対象部位の接続部の形状や寸法についても前記実施形態のものに限定されず、それらの先端部に形成される溶融固化部が断面円形となっていればよい。 Further, in the above embodiment, the combination of the nickel-based alloy and the austenite-based stainless steel is exemplified as the metal material of the flexible member and the target portion, but the combination of the metal materials to which the welded structure of the present invention can be applied is molten. The material may be a dissimilar metal material in which the solidified portion mainly has an austenite phase, and is not limited to that of the embodiment. Further, the shape and dimensions of the welded portion of the flexible member and the connecting portion of the target portion are not limited to those of the above-described embodiment, as long as the melt-solidified portion formed at the tip thereof has a circular cross section. Good.

また、前記実施形態では、被溶接部および接続部の先端部を電子ビーム溶接によって溶接して溶融固化部が形成されるものとしたが、これに限らず、レーザー溶接やマイクロプラズマ溶接（ＴＩＧ溶接）など、適宜な溶接方法を採用することができる。 Further, in the above embodiment, the welded portion and the tip portion of the connecting portion are welded by electron beam welding to form a melt-solidified portion, but the present invention is not limited to this, and laser welding or microplasma welding (TIG welding) is not limited to this. ), Etc., an appropriate welding method can be adopted.

以上、本発明の実施の形態について図面を参照して詳述してきたが、具体的な構成はこれらの実施の形態に限られるものではなく、本発明の要旨を逸脱しない範囲の設計の変更等があっても本発明に含まれる。 Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the design changes, etc. within the range not deviating from the gist of the present invention, etc. Even if there is, it is included in the present invention.

１１，３１，４１ 成形ベローズ（可撓部材）
１１ａ，３１ａ，４１ａ 被溶接部
１２，１３，３２，３３，４２，４３ フランジ部材（対象部位）
１４，３４，４４ 溶融固化部
１５，３５，４５ 接続部
１５ａ，３５ａ，４５ａ 第一面
１５ｂ，３５ｂ，４５ｂ 第二面
２１ 溶接ベローズ（可撓部材）
２１ａ 被溶接部
２２，２３ フランジ部材（対象部位）
２４ 溶融固化部
２５ 接続部
２５ａ 第一面
２５ｂ 第二面
５０ ベローズ弁（弁装置）
５１ 弁室
５３ 弁体
５５ ベローズ
５５ａ 成形ベローズ（可撓部材）
５６ 接続部
５７ 溶融固化部
６０ ダイヤフラム弁（弁装置）
６１ 弁室
６２ｈ 固定部（対象部位）
６３ 弁体
６５ 金属ダイヤフラム
６５ａ 被溶接部
６７ 接続部
６７ａ 第一面
６７ｂ 第二面
６８ 溶融固化部 11,31,41 Molded bellows (flexible member)
11a, 31a, 41a Welded parts 12, 13, 32, 33, 42, 43 Flange members (target parts)
14, 34, 44 Melting and solidifying parts 15, 35, 45 Connection parts 15a, 35a, 45a First surface 15b, 35b, 45b Second surface 21 Welded bellows (flexible member)
21a Welded parts 22, 23 Flange members (target parts)
24 Melt solidification part 25 Connection part 25a First side 25b Second side 50 Bellows valve (valve gear)
51 Valve chamber 53 Valve body 55 Bellows 55a Molded bellows (flexible member)
56 Connection 57 Melt solidification 60 Diaphragm valve (valve gear)
61 Valve chamber 62h Fixed part (target part)
63 Valve body 65 Metal diaphragm 65a Welded part 67 Connection part 67a First surface 67b Second surface 68 Melting and solidifying part

Claims (9)

対象部位に対して薄板材からなる可撓部材を溶接接合するための溶接構造であって、
前記対象部位および前記可撓部材は、互いの溶融固化部が主としてオーステナイト相となる異種金属素材からなり、
前記対象部位は、第一面と、その反対側の第二面と、を有した突起状の接続部を備え、
前記可撓部材は、前記接続部の前記第一面に沿う板状の被溶接部を有し、
前記溶融固化部は、前記接続部および前記被溶接部の先端部に設けられるとともに、前記接続部および前記被溶接部を合せた厚み寸法以上の直径を有する断面円形に形成され、
前記接続部の先端側および前記被溶接部の先端側の厚み寸法が互いに同程度であり、
前記対象部位は、主としてオーステナイト系ステンレス鋼から構成され、前記可撓部材は、主としてＮＣＦ６００、ＮＣＦ６０１、ＮＣＦ６２５、ＮＣＦ６９０のうちのいずれかのニッケル基合金から構成されることを特徴とする溶接構造。 It is a welded structure for welding and joining flexible members made of thin plates to the target part.
The target portion and the flexible member are made of a dissimilar metal material in which the melt-solidified portions of each other are mainly in the austenite phase.
The target portion includes a protruding connection portion having a first surface and a second surface on the opposite side thereof.
The flexible member has a plate-shaped welded portion along the first surface of the connecting portion.
The melt-solidified portion is provided at the tip portion of the connection portion and the welded portion, and is formed in a circular cross section having a diameter equal to or larger than the combined thickness dimension of the connection portion and the welded portion .
The thickness dimensions of the tip side of the connection portion and the tip side of the welded portion are similar to each other.
The target portion is mainly composed of austenitic stainless steel, and the flexible member is mainly composed of a nickel-based alloy of any one of NCF600, NCF601, NCF625, and NCF690 . 前記可撓部材は、円筒状かつ蛇腹状に形成された金属ベローズであり、前記対象部位は、前記金属ベローズの軸方向末端に固定されるフランジ部材であって、
前記接続部は、径方向の外側方向に突出するとともに周方向に連続した環状に形成され、
前記被溶接部は、前記金属ベローズの軸方向末端にて径方向の外側方向に延びるとともに、周方向に連続した環状に形成され、
前記溶融固化部は、前記接続部および前記被溶接部の先端部に沿って周方向に連続して設けられていることを特徴とする請求項１に記載の溶接構造。 The flexible member is a metal bellows formed in a cylindrical and bellows shape, and the target portion is a flange member fixed to the axial end of the metal bellows.
The connecting portion is formed in an annular shape that protrudes outward in the radial direction and is continuous in the circumferential direction.
The welded portion extends outward in the radial direction at the axial end of the metal bellows and is formed in a ring shape continuous in the circumferential direction.
The welded structure according to claim 1, wherein the melt-solidified portion is continuously provided in the circumferential direction along the connecting portion and the tip end portion of the welded portion. 前記可撓部材は、円筒状かつ蛇腹状に形成された金属ベローズであり、前記対象部位は、前記金属ベローズの軸方向末端に固定されるフランジ部材であって、
前記接続部は、径方向の内側方向に突出するとともに周方向に連続した環状に形成され、
前記被溶接部は、前記金属ベローズの軸方向末端にて径方向の内側方向に延びるとともに、周方向に連続した環状に形成され、
前記溶融固化部は、前記接続部および前記被溶接部の先端部に沿って周方向に連続して設けられていることを特徴とする請求項１に記載の溶接構造。 The flexible member is a metal bellows formed in a cylindrical and bellows shape, and the target portion is a flange member fixed to the axial end of the metal bellows.
The connecting portion is formed in an annular shape that protrudes inward in the radial direction and is continuous in the circumferential direction.
The welded portion extends in the radial inward direction at the axial end of the metal bellows and is formed in a ring shape continuous in the circumferential direction.
The welded structure according to claim 1, wherein the melt-solidified portion is continuously provided in the circumferential direction along the connecting portion and the tip end portion of the welded portion. 前記可撓部材は、円筒状かつ蛇腹状に形成された金属ベローズであり、前記対象部位は、前記金属ベローズの軸方向末端に固定されるフランジ部材であって、
前記接続部は、軸方向の外側方向に突出するとともに周方向に連続した環状に形成され、
前記被溶接部は、前記金属ベローズの軸方向末端にて軸方向の外側方向に延びるとともに、周方向に連続した環状に形成され、
前記溶融固化部は、前記接続部および前記被溶接部の先端部に沿って周方向に連続して設けられていることを特徴とする請求項１に記載の溶接構造。 The flexible member is a metal bellows formed in a cylindrical and bellows shape, and the target portion is a flange member fixed to the axial end of the metal bellows.
The connecting portion is formed in an annular shape that protrudes outward in the axial direction and is continuous in the circumferential direction.
The welded portion extends outward in the axial direction at the axial end of the metal bellows and is formed in an annular shape continuous in the circumferential direction.
The welded structure according to claim 1, wherein the melt-solidified portion is continuously provided in the circumferential direction along the connecting portion and the tip end portion of the welded portion. 弁本体の弁室内に設けられる弁体と、前記弁室をシールする前記可撓部材としてのダイヤフラムと、を備えた弁装置に用いられ、
前記弁本体は、周方向に連続した環状の前記接続部を有し、
前記ダイヤフラムは、円板状の外周縁に沿って周方向に連続した環状の前記被溶接部を有して構成され、
前記溶融固化部は、前記接続部および前記被溶接部の先端部に沿って周方向に連続して設けられていることを特徴とする請求項１に記載の溶接構造。 It is used in a valve device provided with a valve body provided in the valve chamber of the valve body and a diaphragm as the flexible member for sealing the valve chamber.
The valve body has the annular connecting portion continuous in the circumferential direction.
The diaphragm is configured to have an annular portion to be welded that is continuous in the circumferential direction along a disk-shaped outer peripheral edge.
The welded structure according to claim 1, wherein the melt-solidified portion is continuously provided in the circumferential direction along the connecting portion and the tip end portion of the welded portion. 前記溶融固化部の直径は、前記接続部の先端側および前記被溶接部を合せた厚み寸法に対し、１．１倍以上かつ１．６倍以下であることを特徴とする請求項１〜５のいずれか一項に記載の溶接構造。 Claims 1 to 5 are characterized in that the diameter of the melt-solidified portion is 1.1 times or more and 1.6 times or less with respect to the thickness dimension of the tip end side of the connection portion and the welded portion combined. The welded structure according to any one of the above. 前記接続部における前記第一面と前記第二面とは、当該接続部の先端に向かって狭まる交差角度を有して設けられ、前記交差角度が４０°以下であることを特徴とする請求項１〜６のいずれか一項に記載の溶接構造。 The first surface and the second surface of the connecting portion are provided with an intersection angle narrowing toward the tip of the connecting portion, and the intersection angle is 40 ° or less. The welded structure according to any one of 1 to 6. 対象部位に対して薄板材からなる可撓部材を溶接接合するための溶接構造であって、
前記対象部位および前記可撓部材は、互いの溶融固化部が主としてオーステナイト相となる異種金属素材からなり、
前記対象部位は、第一面と、その反対側の第二面と、を有した突起状の接続部を備え、
前記可撓部材は、前記接続部の前記第一面に沿う板状の被溶接部を有し、
前記溶融固化部は、前記接続部および前記被溶接部の先端部に設けられるとともに、前記接続部および前記被溶接部を合せた厚み寸法以上の直径を有する断面円形に形成され、
前記被溶接部は、前記可撓部材を構成する薄板材の端部を折り返して重ねた折返部によって構成され、前記薄板材の端縁側が前記接続部の前記第一面に沿って設けられていることを特徴とする溶接構造。 It is a welded structure for welding and joining flexible members made of thin plates to the target part.
The target portion and the flexible member are made of a dissimilar metal material in which the melt-solidified portions of each other are mainly in the austenite phase.
The target portion includes a protruding connection portion having a first surface and a second surface on the opposite side thereof.
The flexible member has a plate-shaped welded portion along the first surface of the connecting portion.
The melt-solidified portion is provided at the tip portion of the connection portion and the welded portion, and is formed in a circular cross section having a diameter equal to or larger than the combined thickness dimension of the connection portion and the welded portion .
The welded portion is composed of a folded portion in which the end portions of the thin plate material constituting the flexible member are folded back and overlapped, and the edge side of the thin plate material is provided along the first surface of the connecting portion. welding structure you characterized in that there. 請求項１〜８のいずれか一項に記載の溶接構造によって可撓部材が装置内部の対象部位に固定されていることを特徴とする弁装置。 A valve device, wherein the flexible member is fixed to a target portion inside the device by the welding structure according to any one of claims 1 to 8.
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