To provide an improved expansion valve which can achieve low costs and low noise.SOLUTION: An expansion valve includes: a valve body 2 including an annular valve seat 20; a valve element 3 which is seated on the valve seat 20 to block passage of a fluid and separates from the valve seat 20 to allow passage of the fluid; a coil spring 41 which is disposed in a valve chamber VS with its side surface facing flow of the fluid flowing from a supply side passage 21 and biases the valve element 3 toward the valve seat 20; and an operation rod 5 which presses the valve element 3 in a direction away from the valve seat 20 against biasing force generated by the coil spring 41. The coil spring 41 has a first coil area A1 facing the flow of the fluid flowing from the supply side passage 21 and a second coil area A2 different from the first coil area A1. A coil gap P1 in the first coil area A1 is smaller than a coil gap P2 in the second coil area A2.SELECTED DRAWING: Figure 2

    【課題】低コストであり且つ低騒音を実現できる、改良された膨張弁を提供する。【解決手段】膨張弁は、環状の弁座20を備えた弁本体2と、弁座20に着座することにより流体の通過を阻止し、弁座20から離間することにより流体の通過を許容する弁体3と、供給側流路21から流入する流体の流れに対して側面を向けて弁室VSに配置され、弁体3を弁座20に向かって付勢するコイルばね41と、コイルばね41による付勢力に抗して、弁体3を弁座20から離間する方向に押圧する作動部材5と、を有し、コイルばね41は、供給側流路21から流入する流体の流れに対向する第1の巻線領域A1と、第1の巻線領域A1とは異なる第2の巻線領域A2とを有し、第1の巻線領域A1における巻線間隙間P1は、第2の巻線領域A2における巻線間隙間P2より小さい。【選択図】図2


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    Title :

    EXPANSION VALVE


    Additional title:

    膨張弁


    Contributors:

    Publication date :

    2019-09-26


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    F25B Kältemaschinen, Kälteanlagen oder Kälteverfahren , REFRIGERATION MACHINES, PLANTS, OR SYSTEMS / B60H ARRANGEMENTS OR ADAPTATIONS OF HEATING, COOLING, VENTILATING, OR OTHER AIR-TREATING DEVICES SPECIALLY FOR PASSENGER OR GOODS SPACES OF VEHICLES , Anordnung oder Einbau der Heizung, Kühlung, Lüftung oder anderer Luftbehandlungsvorrichtungen für die Fahrzeugräume für Reisende oder Fracht / F16K VALVES , Ventile



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