JP2011027374A - Expansion valve - Google Patents

Expansion valve Download PDF

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JP2011027374A
JP2011027374A JP2009176033A JP2009176033A JP2011027374A JP 2011027374 A JP2011027374 A JP 2011027374A JP 2009176033 A JP2009176033 A JP 2009176033A JP 2009176033 A JP2009176033 A JP 2009176033A JP 2011027374 A JP2011027374 A JP 2011027374A
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refrigerant
expansion valve
working fluid
temperature
power element
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Akira Matsuda
亮 松田
Akinori Nanbu
晶紀 南部
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Fujikoki Corp
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Fujikoki Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an expansion valve using a refrigerant least influencing global warming as working fluid of a power element, and achieving desired temperature and pressure characteristics. <P>SOLUTION: The working fluid prepared by mixing an artificial refrigerant having a global warming potential (GWP) of 150 or less and a natural refrigerant is sealed in a temperature sensitive chamber 20a of the power element 20 of the expansion valve. The artificial refrigerant is selected from HFC-152a, HFC-41 and trifluoromethane iodide, and the natural refrigerant is selected from butane (R600), isobutane (R600a), propane (R290), carbon dioxide (R744) and ammonia (R717). Further an inert gas is mixed in the working fluid with a prescribed mixing ratio, thus the desired temperature and pressure characteristics are easily achieved. The bad influence on the environment is reduced even when the working fluid in the power element can not be recovered at disposal of the expansion valve. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

この発明は、エアコン装置等の冷凍サイクルに用いられる温度式の膨張弁に関する。   The present invention relates to a temperature type expansion valve used in a refrigeration cycle such as an air conditioner.

周知のように、エアコン装置等の冷凍サイクルにおいては、圧縮機から吐出され凝縮器で凝縮された高温高圧の冷媒が膨張弁を通じて蒸発器に送られ、その後再び圧縮機に戻るようになっている。膨張弁は、圧縮機からの高温高圧の冷媒が通過する際に当該冷媒を断熱膨張させるオリフィスと、当該オリフィスの開度を変更する弁体とを備えており、弁体によって流量制御された冷媒が蒸発器に送り込まれる。   As is well known, in a refrigeration cycle such as an air conditioner, high-temperature and high-pressure refrigerant discharged from a compressor and condensed in a condenser is sent to an evaporator through an expansion valve, and then returns to the compressor again. . The expansion valve includes an orifice that adiabatically expands the refrigerant when the high-temperature and high-pressure refrigerant from the compressor passes, and a valve body that changes the opening of the orifice, and the flow rate of which is controlled by the valve body Is fed into the evaporator.

膨張弁は、蒸発器から圧縮機へ向かう低圧媒体の冷媒通路内に配置された弁体駆動部材（感温ロッド）と、この弁体駆動部材を介して弁体を駆動するパワーエレメントとを備えている。パワーエレメントの感温室には、冷凍サイクルを流れる冷媒と同じ又は類似した種類の純度の高い冷媒ガスと不活性ガスが適切な混合比（圧力比）で充填され、作動流体とされている。弁体駆動部材が感知した低圧冷媒の温度はパワーエレメントの感温室に伝達され、感温室内の作動流体が弁体駆動部材を介して弁体を駆動してオリフィスを開閉する。膨張弁の開弁特性は作動流体の温度−圧力の特性に依存し、その特性曲線の傾きは、温度変化の際に生じる圧力変動の大きさを示すから、開弁の応答特性を定める重要なファクターである。   The expansion valve includes a valve body drive member (temperature-sensitive rod) disposed in the refrigerant passage of the low-pressure medium from the evaporator to the compressor, and a power element that drives the valve body through the valve body drive member. ing. The power element's sensation chamber is filled with an appropriate mixture ratio (pressure ratio) of high-purity refrigerant gas and inert gas of the same or similar type as the refrigerant flowing in the refrigeration cycle, and used as a working fluid. The temperature of the low-pressure refrigerant sensed by the valve element driving member is transmitted to the temperature sensing chamber of the power element, and the working fluid in the temperature sensing chamber drives the valve element via the valve element driving member to open and close the orifice. The valve opening characteristics of the expansion valve depend on the temperature-pressure characteristics of the working fluid, and the slope of the characteristic curve indicates the magnitude of pressure fluctuation that occurs when the temperature changes. Is a factor.

ところで、カーエアコン等の冷凍サイクルを廃棄する場合には、サイクルを循環するシステム冷媒の回収は容易であるが、膨張弁のパワーエレメントの感温室は密閉容器に形成されており、膨張弁の廃棄時にこの密閉容器内の封入ガスを回収することは困難である。したがって、結果的に、膨張弁の封入ガスは大気へ放出される場合が多い。   By the way, when discarding a refrigeration cycle such as a car air conditioner, it is easy to recover the system refrigerant circulating through the cycle, but the temperature sensing chamber of the power element of the expansion valve is formed in a sealed container, and the expansion valve is discarded. Sometimes it is difficult to recover the sealed gas in this sealed container. Therefore, as a result, the gas enclosed in the expansion valve is often released to the atmosphere.

フロン１３４ａ等の地球温暖化係数（ＧＷＰ）の高い冷媒は地球大気の温暖化の原因物質であるとの見方から、近年、欧州冷媒規制等で環境への配慮が求められており、使用できなくなってきている。膨張弁の封入ガスについても、回収が困難であれば、地球温暖化係数（ＧＷＰ）の低い物質とすることが求められている。   In view of the fact that refrigerants with a high global warming potential (GWP) such as Freon 134a are the causative substances of global warming, in recent years environmental considerations have been required by European refrigerant regulations, etc., making them unusable. It is coming. If the recovery gas of the expansion valve sealing gas is difficult, it is required to use a substance having a low global warming potential (GWP).

特開２００１−２０１２１２号公報JP 2001-20122 A

しかしながら、地球温暖化係数（ＧＷＰ）が低い等、地球温暖化への影響が少ない冷媒ガスは、単一の物質から成る場合、膨張弁の開弁特性として任意の特性を得ることが困難な場合がある。
この発明の目的は、パワーエレメントの作動流体として、地球温暖化への影響が少ない冷媒を用いるとともに、所望の温度−圧力特性を得られるようにした膨張弁を提供することにある。 However, when the refrigerant gas that has little influence on global warming, such as a low global warming potential (GWP), is made of a single substance, it is difficult to obtain any characteristic as the valve opening characteristic of the expansion valve. There is.
An object of the present invention is to provide an expansion valve that uses a refrigerant that has little influence on global warming as a working fluid of a power element and that can obtain a desired temperature-pressure characteristic.

本発明による膨張弁は、蒸発器からの低圧冷媒の温度を感知して弁開度を制御するパワーエレメントを備えた膨張弁であって、前記パワーエレメントの感温室内に、地球温暖化係数（ＧＷＰ）が１５０以下の人工冷媒又は自然冷媒を２種類以上混合して成る作動流体を封入したことを特徴としている。また、本発明による他の膨張弁は、蒸発器からの低圧冷媒の温度を感知して弁開度を制御するパワーエレメントを備えた膨張弁であって、前記パワーエレメントの感温室内に、地球温暖化係数（ＧＷＰ）が１５０以下の人工冷媒と自然冷媒とを混合して成る作動流体を封入したことを特徴としている。前記人工冷媒は、例えば、ＨＦＣ−１５２ａ、ＨＦＣ−４１及びヨウ化トリフルオロメタンから選ぶことができる。また、前記自然冷媒は、例えば、ブタン（Ｒ６００）、イソブタン（Ｒ６００ａ）、プロパン（Ｒ２９０）、二酸化炭素（Ｒ７４４）及びアンモニア（Ｒ７１７）から選ぶことができる。   The expansion valve according to the present invention is an expansion valve including a power element that senses the temperature of the low-pressure refrigerant from the evaporator and controls the valve opening degree, and has a global warming potential ( GWP) is characterized by enclosing a working fluid formed by mixing two or more types of artificial refrigerant or natural refrigerant having a GWP of 150 or less. Further, another expansion valve according to the present invention is an expansion valve including a power element that senses the temperature of the low-pressure refrigerant from the evaporator and controls the valve opening degree. It is characterized by enclosing a working fluid formed by mixing an artificial refrigerant having a global warming potential (GWP) of 150 or less and a natural refrigerant. The artificial refrigerant can be selected from, for example, HFC-152a, HFC-41, and iodinated trifluoromethane. The natural refrigerant can be selected from, for example, butane (R600), isobutane (R600a), propane (R290), carbon dioxide (R744), and ammonia (R717).

なお、前記作動流体は、前記人工冷媒及び／又は自然冷媒に加えて不活性ガスを所定の混合比で混合して成るものとすることができる。   The working fluid may be formed by mixing an inert gas at a predetermined mixing ratio in addition to the artificial refrigerant and / or natural refrigerant.

この発明による膨張弁は、地球温暖化への影響が少ない複数種類の冷媒がパワーエレメントに封入されることになるので、単一の冷媒では得られにくい所望の温度−圧力特性が得られるとともに、廃棄時において回収できなくても環境への悪影響を低減することができる。   In the expansion valve according to the present invention, since a plurality of types of refrigerants having little influence on global warming are sealed in the power element, desired temperature-pressure characteristics that are difficult to obtain with a single refrigerant are obtained, Even if it cannot be recovered at the time of disposal, adverse effects on the environment can be reduced.

本発明による膨張弁の一例を示す断面図である。It is sectional drawing which shows an example of the expansion valve by this invention. 本発明による膨張弁の温度−圧力特性の一例を示す特性曲線図である。It is a characteristic curve figure which shows an example of the temperature-pressure characteristic of the expansion valve by this invention.

以下、添付した図面に基づいて、本発明による膨張弁の実施例を説明する。図１は本発明による膨張弁の一例を示す断面図、図２は本発明による膨張弁の温度−圧力特性の一例を示す特性曲線図である。   Hereinafter, embodiments of an expansion valve according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a sectional view showing an example of an expansion valve according to the present invention, and FIG. 2 is a characteristic curve diagram showing an example of temperature-pressure characteristics of the expansion valve according to the present invention.

図１に示す膨張弁において、角柱状の弁本体１０には、圧縮機１１の吐出側からの高温高圧の冷媒が流れる第１の冷媒通路１４と、蒸発器１５からの低圧冷媒が流れる第２の冷媒通路１９とが相互に独立して形成されている。第１の冷媒通路１４の一端は蒸発器１５の入口に連結され、蒸発器１５の出口は第２の冷媒通路１９を介して圧縮機１１に連結され、圧縮機１１は、凝縮器１２及びレシーバ１３を介して第１の冷媒通路１４の他端に連結されている。第１の冷媒通路１４に連通する弁室２４にはオリフィス１６に接離する球形の弁体１８が配置されている。弁体１８は支持部材２６に支持され、バイアスバネである付勢手段１７によってオリフィス１６側に付勢されている。なお、弁室２４はプラグ２５で封止されている。弁本体１０には第２の冷媒通路１９に隣接してダイヤフラム２２を有したパワーエレメント部２０が固定されている。パワーエレメント部２０は、蒸発器１５に供給される冷媒の量を調整するためのもので、弁体駆動部材２３を介して弁体１８を駆動する。ダイヤフラム２２で仕切られたパワーエレメント部２０の上方の感温室２０ａは気密にされており、後述する作動流体が封入されている。   In the expansion valve shown in FIG. 1, the prismatic valve body 10 has a first refrigerant passage 14 through which high-temperature and high-pressure refrigerant from the discharge side of the compressor 11 flows, and second low-pressure refrigerant from the evaporator 15. The refrigerant passages 19 are formed independently of each other. One end of the first refrigerant passage 14 is connected to the inlet of the evaporator 15, the outlet of the evaporator 15 is connected to the compressor 11 via the second refrigerant passage 19, and the compressor 11 includes the condenser 12 and the receiver. 13 is connected to the other end of the first refrigerant passage 14 via 13. A spherical valve element 18 that contacts and separates from the orifice 16 is disposed in the valve chamber 24 that communicates with the first refrigerant passage 14. The valve body 18 is supported by a support member 26 and is urged toward the orifice 16 by an urging means 17 that is a bias spring. The valve chamber 24 is sealed with a plug 25. A power element portion 20 having a diaphragm 22 is fixed to the valve body 10 adjacent to the second refrigerant passage 19. The power element unit 20 is for adjusting the amount of refrigerant supplied to the evaporator 15, and drives the valve body 18 via the valve body driving member 23. The temperature-sensitive greenhouse 20a above the power element section 20 partitioned by the diaphragm 22 is hermetically sealed, and a working fluid described later is enclosed.

パワーエレメント部２０の感温室２０ａから延出している小管２１については、感温室２０ａからの脱気及び感温室２０ａへの作動流体の注入に使用された後に、端部が密封される。パワーエレメント部２０の下方の室２０ｂには、弁本体１０内において弁体１８から第２の冷媒通路１９を貫通して延びる感温・伝達部材たる弁体駆動部材（感温ロッド）２３の延出端が配置され、ダイヤフラム２２に当接している。弁体駆動部材２３は熱容量の大きな材料で形成されていて、第２の冷媒通路１９を流れる蒸発器１５の出口からの冷媒蒸気の温度をパワーエレメント部２０の感温室２０ａ内の作動流体に伝達し、この温度に対応した圧力の作動ガスを発生させる。下方の室２０ｂは弁体駆動部材２３の周囲の隙間を介して第２の冷媒通路１９に連通している。   About the small tube 21 extended from the sensitive room 20a of the power element part 20, after being used for the deaeration from the sensitive room 20a and the injection | pouring of the working fluid to the sensitive room 20a, an edge part is sealed. In the chamber 20 b below the power element portion 20, an extension of a valve body driving member (temperature sensing rod) 23 that is a temperature sensing / transmission member extending from the valve body 18 through the second refrigerant passage 19 in the valve body 10. The leading end is disposed and is in contact with the diaphragm 22. The valve body driving member 23 is made of a material having a large heat capacity, and transmits the temperature of the refrigerant vapor from the outlet of the evaporator 15 flowing through the second refrigerant passage 19 to the working fluid in the temperature sensitive room 20a of the power element unit 20. Then, a working gas having a pressure corresponding to this temperature is generated. The lower chamber 20 b communicates with the second refrigerant passage 19 through a gap around the valve body driving member 23.

パワーエレメント部２０のダイヤフラム２２は、感温室２０ａ内の作動流体の作動ガスの圧力と下方の室２０ｂ内の蒸発器１５の出口における冷媒蒸気の圧力との差にしたがって付勢手段１７の付勢力の影響の下で弁体駆動部材２３により弁体１８を駆動し、オリフィス１６の開度（即ち、蒸発器の入口への液体状の冷媒の流入量）を調整する。   The diaphragm 22 of the power element unit 20 has a biasing force of the biasing means 17 according to the difference between the pressure of the working gas of the working fluid in the sensitive room 20a and the pressure of the refrigerant vapor at the outlet of the evaporator 15 in the lower chamber 20b. The valve body 18 is driven by the valve body driving member 23 under the influence of the above, and the opening degree of the orifice 16 (that is, the amount of liquid refrigerant flowing into the inlet of the evaporator) is adjusted.

この膨張弁は、冷凍サイクルの蒸発器１５出口の冷媒の温度に対応して蒸発器１５に供給される冷媒の量を自動的に制御する。即ち、蒸発器１５から圧縮機１１に至る第２の冷媒通路１９を流れる冷媒の温度が、例えば負荷の増大によって上昇すると、第２の冷媒通路１９内に配置された弁体駆動部材２３からパワーエレメント２０のダイヤフラム２２に熱が伝達されて、パワーエレメント部２０の感温室２０ａ内の作動流体（気体）の圧力が上昇する。感温室２０ａ内の上昇した圧力は、ダイヤフラム２２を介して弁体駆動部材２３を下降させるので、弁体１８はオリフィス１６を開く方向に移動する。蒸発器１５に供給される冷媒の流量が増加することで、蒸発器１５から吐出されて第２の冷媒通路１９内を流れる冷媒の温度が下降する方向に制御される。   This expansion valve automatically controls the amount of refrigerant supplied to the evaporator 15 in accordance with the temperature of the refrigerant at the outlet of the evaporator 15 in the refrigeration cycle. That is, when the temperature of the refrigerant flowing through the second refrigerant passage 19 extending from the evaporator 15 to the compressor 11 rises due to, for example, an increase in load, the valve body driving member 23 disposed in the second refrigerant passage 19 generates power. Heat is transmitted to the diaphragm 22 of the element 20, and the pressure of the working fluid (gas) in the sensitive room 20 a of the power element unit 20 increases. The increased pressure in the sensation greenhouse 20a lowers the valve body driving member 23 via the diaphragm 22, so that the valve body 18 moves in the direction to open the orifice 16. By increasing the flow rate of the refrigerant supplied to the evaporator 15, the temperature of the refrigerant discharged from the evaporator 15 and flowing in the second refrigerant passage 19 is controlled to decrease.

本発明による膨張弁の温度−圧力特性の一例が図２に示されている。図２の横軸は冷媒の温度であり、縦軸は冷媒の圧力である。図中、［Ｓ］はシステム冷媒（本実施例ではＨＦＣ−１３４ａ）の飽和蒸気圧曲線、［Ａ］は地球温暖化係数ＧＷＰが１５０以下の人工冷媒（本実施例ではＨＦＣ−１５２ａ）の飽和蒸気圧曲線、［Ｂ］は自然冷媒（本実施例ではＲ６００）の飽和蒸気圧曲線、［Ｃ］は人工冷媒Ａと自然冷媒Ｂと不活性ガス（本実施例ではヘリウム）とを所定の混合比（本実施例では２：２：１）で混合して成る混合流体の飽和蒸気圧曲線である。人工冷媒と自然冷媒と不活性ガスの混合比を変えることで、人工冷媒による特性と自然冷媒による特性の間の任意の温度−圧力特性を示す作動流体を得ることができる。そして、不活性ガスを所定の混合比で封入することにより、より広い範囲内で特性を定めることができる。このように、感温室に封入する冷媒と不活性ガスの種類と混合比を適宜選択することによって任意の飽和圧力特性を得ることができる。すなわち、冷凍システムで要求される特性に最も近い特性曲線を示す冷媒と不活性ガスの組み合わせが、膨張弁のパワーエレメントに用いる作動流体として選ばれる。   An example of the temperature-pressure characteristic of an expansion valve according to the present invention is shown in FIG. The horizontal axis in FIG. 2 is the refrigerant temperature, and the vertical axis is the refrigerant pressure. In the figure, [S] is the saturation vapor pressure curve of the system refrigerant (HFC-134a in this embodiment), and [A] is the saturation of the artificial refrigerant (HFC-152a in this embodiment) having a global warming potential GWP of 150 or less. Vapor pressure curve, [B] is a saturated vapor pressure curve of natural refrigerant (R600 in this embodiment), [C] is a predetermined mixture of artificial refrigerant A, natural refrigerant B and inert gas (helium in this embodiment). It is a saturated vapor pressure curve of the fluid mixture which mixes by ratio (this example 2: 2: 1). By changing the mixing ratio of the artificial refrigerant, the natural refrigerant, and the inert gas, it is possible to obtain a working fluid that exhibits an arbitrary temperature-pressure characteristic between the characteristic of the artificial refrigerant and the characteristic of the natural refrigerant. Then, by sealing the inert gas at a predetermined mixing ratio, the characteristics can be determined within a wider range. Thus, arbitrary saturation pressure characteristics can be obtained by appropriately selecting the kind and mixing ratio of the refrigerant and the inert gas sealed in the temperature sensitive greenhouse. That is, a combination of a refrigerant and an inert gas that exhibits a characteristic curve closest to the characteristics required for the refrigeration system is selected as the working fluid used for the power element of the expansion valve.

地球温暖化係数ＧＷＰが１５０以下の人工冷媒としては、例えば、ＨＦＣ−１５２ａ、ＨＦＣ−４１、ヨウ化トリフルオロメタン等から選ぶことができる。また、自然冷媒としては、例えば、ブタン（Ｒ６００）、イソブタン（Ｒ６００ａ）、プロパン（Ｒ２９０）、二酸化炭素（Ｒ７４４）、アンモニア（Ｒ７１７）等から選ぶことができる。また、不活性ガスとしては、例えば、ヘリウムや窒素等から選ぶことができる。   The artificial refrigerant having a global warming potential GWP of 150 or less can be selected from, for example, HFC-152a, HFC-41, and trifluoromethane iodide. The natural refrigerant can be selected from, for example, butane (R600), isobutane (R600a), propane (R290), carbon dioxide (R744), ammonia (R717), and the like. Moreover, as an inert gas, it can select from helium, nitrogen, etc., for example.

上記のような地球温暖化係数ＧＷＰが１５０以下の人工冷媒と自然冷媒とを混合して成る作動流体に代えて、地球温暖化係数ＧＷＰが１５０以下の複数の人工冷媒を混合した冷媒を用いて任意の特性を得ることもできる。地球温暖化係数ＧＷＰが１５０以下の人工冷媒としては、例えば上に例示したものから選択することができる。また、この混合冷媒に、更に上に例示した不活性ガスを混合して任意の温度−圧力特性を得ることもできる。   Instead of the working fluid formed by mixing an artificial refrigerant having a global warming potential GWP of 150 or less and a natural refrigerant as described above, a refrigerant in which a plurality of artificial refrigerants having a global warming coefficient GWP of 150 or less is mixed is used. Arbitrary characteristics can also be obtained. The artificial refrigerant having a global warming potential GWP of 150 or less can be selected from those exemplified above, for example. Further, an arbitrary temperature-pressure characteristic can be obtained by further mixing the inert gas exemplified above with this mixed refrigerant.

更に、上記のような、地球温暖化係数ＧＷＰが１５０以下の人工冷媒と自然冷媒とを混合して成る作動流体や、地球温暖化係数ＧＷＰが１５０以下の複数の人工冷媒を混合して成る作動流体に代えて、地球温暖化係数ＧＷＰが１５０以下の複数の自然冷媒を混合して成る作動流体を用いて任意の特性を得ることもできる。自然冷媒としては、例えば、上に例示した中から２種類以上を選択することができる。また、この混合冷媒に更に不活性ガスを混合して任意の温度−圧力特性を得ることもできる。   Further, the above-described working fluid obtained by mixing an artificial refrigerant having a global warming potential GWP of 150 or less and a natural refrigerant, or an operation obtained by mixing a plurality of artificial refrigerants having a global warming coefficient GWP of 150 or less. Arbitrary characteristics can be obtained by using a working fluid formed by mixing a plurality of natural refrigerants having a global warming potential GWP of 150 or less instead of the fluid. As the natural refrigerant, for example, two or more types can be selected from the examples exemplified above. Moreover, an inert gas can be further mixed with this mixed refrigerant to obtain an arbitrary temperature-pressure characteristic.

以上説明したように、地球温暖化係数ＧＷＰが１５０以下の人工冷媒や自然冷媒であっても、これらを複数種類混合し、更に不活性ガスを追加充填するなどして、任意の温度−圧力特性を得ることが可能となるので、冷凍システムに要求される温度−圧力特性を持つ作動流体を得ることが可能となる。また、膨張弁のパワーエレメントの感温室に封入する作動流体を、システム冷媒やそれに近い冷媒とは異なるものとすることができるので、膨張弁の廃棄の際に、作動流体を回収できなくても、環境への悪影響を軽減することができる   As described above, even if it is an artificial refrigerant or natural refrigerant having a global warming potential GWP of 150 or less, an arbitrary temperature-pressure characteristic can be obtained by mixing a plurality of these refrigerants and further filling with an inert gas. Therefore, it is possible to obtain a working fluid having temperature-pressure characteristics required for a refrigeration system. In addition, since the working fluid sealed in the temperature sensitive chamber of the expansion valve power element can be different from the system refrigerant or refrigerant close to it, even if the working fluid cannot be recovered when the expansion valve is discarded , Can reduce the negative impact on the environment

１ 膨張弁 １０ 弁本体
１１ 圧縮機 １２ 凝縮器
１３ レシーバ １４ 第１の冷媒通路
１５ 蒸発器 １６ オリフィス
１７ 付勢手段 １８ 弁体
１９ 第２の冷媒通路 ２０ パワーエレメント部
２０ａ 感温室 ２０ｂ 室
２１ 小管 ２２ ダイヤフラム
２２ 弁体駆動部材（感温ロッド） ２４ 弁室
２５ プラグ ２６ 支持部材 DESCRIPTION OF SYMBOLS 1 Expansion valve 10 Valve main body 11 Compressor 12 Condenser 13 Receiver 14 1st refrigerant path 15 Evaporator 16 Orifice 17 Energizing means 18 Valve body 19 2nd refrigerant path 20 Power element part 20a Greenhouse 20b Chamber 21 Small pipe 22 Diaphragm 22 Valve body drive member (temperature sensing rod) 24 Valve chamber 25 Plug 26 Support member

Claims (5)

蒸発器からの低圧冷媒の温度を感知して弁開度を制御するパワーエレメントを備えた膨張弁であって、前記パワーエレメントの感温室内に、地球温暖化係数（ＧＷＰ）が１５０以下の人工冷媒又は自然冷媒を２種類以上混合して成る作動流体を封入したことを特徴とする膨張弁。   An expansion valve having a power element that senses the temperature of a low-pressure refrigerant from an evaporator and controls the valve opening degree, and has a global warming potential (GWP) of 150 or less in a temperature-sensitive greenhouse of the power element. An expansion valve comprising a working fluid formed by mixing two or more kinds of refrigerants or natural refrigerants. 蒸発器からの低圧冷媒の温度を感知して弁開度を制御するパワーエレメントを備えた膨張弁であって、前記パワーエレメントの感温室内に、地球温暖化係数（ＧＷＰ）が１５０以下の人工冷媒と自然冷媒を混合して成る作動流体を封入したことを特徴とする膨張弁。   An expansion valve having a power element that senses the temperature of a low-pressure refrigerant from an evaporator and controls the valve opening degree, and has a global warming potential (GWP) of 150 or less in a temperature-sensitive greenhouse of the power element. An expansion valve comprising a working fluid formed by mixing a refrigerant and a natural refrigerant. 前記人工冷媒は、ＨＦＣ−１５２ａ、ＨＦＣ−４１及びヨウ化トリフルオロメタンから選ばれることを特徴とする請求項１又は２記載の膨張弁。   The expansion valve according to claim 1 or 2, wherein the artificial refrigerant is selected from HFC-152a, HFC-41, and iodinated trifluoromethane. 前記自然冷媒は、ブタン（Ｒ６００）、イソブタン（Ｒ６００ａ）、プロパン（Ｒ２９０）、二酸化炭素（Ｒ７４４）及びアンモニア（Ｒ７１７）から選ばれることを特徴とする請求項１乃至３のいずれかに記載の膨張弁。   The expansion according to any one of claims 1 to 3, wherein the natural refrigerant is selected from butane (R600), isobutane (R600a), propane (R290), carbon dioxide (R744), and ammonia (R717). valve. 前記作動流体は、不活性ガスを所定の混合比で混合して成るものであることを特徴とする請求項１乃至４のいずれかに記載の膨張弁。   The expansion valve according to any one of claims 1 to 4, wherein the working fluid is formed by mixing an inert gas at a predetermined mixing ratio.
JP2009176033A 2009-07-29 2009-07-29 Expansion valve Pending JP2011027374A (en)

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