EXPANSION VALVE

• Main Authors: HAYAKAWA JUNYA, OKUTSU KINYA, KUBOTA KOHEI
• Format: Patent
• Language: English; Japanese
• Published: 01.03.2021
• Subjects: ACTUATING-FLOATS; BLASTING; COCKS; COMBINED HEATING AND REFRIGERATION SYSTEMS; DEVICES FOR VENTING OR AERATING; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEAT PUMP SYSTEMS; HEATING; LIGHTING; LIQUEFACTION SOLIDIFICATION OF GASES; MANUFACTURE OR STORAGE OF ICE; MECHANICAL ENGINEERING; REFRIGERATION MACHINES, PLANTS OR SYSTEMS; REFRIGERATION OR COOLING; TAPS; THERMAL INSULATION IN GENERAL; VALVES; WEAPONS

To provide an expansion valve capable of suppressing the overheat degree in high load, even in the case where it is used in a refrigeration cycle using a variable capacity compressor.SOLUTION: An expansion valve includes: a valve body 2 including a valve seat 20; a valve element 3 for restricting or allowing passing of a fluid via the valve seat by approaching or being separated with respect to the valve seat; a coil spring 41 for energizing the valve element toward the valve seat; an operation rod 5 whose one end is in contact with the valve element; and a power element 8 for driving the operation rod. The power element includes: an upper lid member 82; a diaphragm 83; a receiving member 86 arranged on the side opposing to the upper lid member by sandwiching the diaphragm; and a stopper member 84 arranged between the diaphragm and the operation rod. In the component arranged in a driving force transmission path between the diaphragm and the valve element, a thermosensitive material 84d is arranged in which a thermal expansion coefficient at a predetermined temperature or higher is larger than a thermal expansion coefficient below the predetermined temperature.SELECTED DRAWING: Figure 1 【課題】可変容量型コンプレッサを用いた冷凍サイクルで使用されるような場合でも、高負荷時の過熱度を抑制できる膨張弁を提供する。【解決手段】膨張弁は、弁座２０を備えた弁本体２と、前記弁座に対して接近又は離間することにより、前記弁座を介する前記流体の通過を制限し又は許容する弁体３と、前記弁体を前記弁座に向かって付勢するコイルばね４１と、前記弁体に一端を当接させた作動棒５と、前記作動棒を駆動するパワーエレメント８と、を有し、前記パワーエレメントは、上蓋部材８２と、ダイアフラム８３と、前記ダイアフラムを挟んで前記上蓋部材と対向する側に配置される受け部材８６と、前記ダイアフラムと前記作動棒との間に配置されたストッパ部材８４と、を備え、前記ダイアフラムと前記弁体との間における駆動力伝達経路内に配置された部品に、所定温度未満の熱膨張率よりも前記所定温度以上の熱膨張率の方が大きい感温材８４ｄを配置した。【選択図】図１