REFRIGERATION CYCLE DEVICE

To provide a refrigeration cycle device having a plurality of evaporators, which can suppress the accumulation of refrigeration oil in an evaporator, and liquid back to a compressor, and can effectively use the plurality of evaporators.SOLUTION: A refrigeration cycle device 10 has a compressor 11, a...

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Main Authors OKAMURA TORU, KONO HIROAKI, KATO YOSHITAKE, MAKIMOTO NAOYA, MIURA KOJI
Format Patent
LanguageEnglish
Japanese
Published 08.02.2022
Subjects
BLASTING
COMBINED HEATING AND REFRIGERATION SYSTEMS
HEAT PUMP SYSTEMS
HEATING
LIGHTING
LIQUEFACTION SOLIDIFICATION OF GASES
MANUFACTURE OR STORAGE OF ICE
MECHANICAL ENGINEERING
REFRIGERATION MACHINES, PLANTS OR SYSTEMS
REFRIGERATION OR COOLING
WEAPONS
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Summary:To provide a refrigeration cycle device having a plurality of evaporators, which can suppress the accumulation of refrigeration oil in an evaporator, and liquid back to a compressor, and can effectively use the plurality of evaporators.SOLUTION: A refrigeration cycle device 10 has a compressor 11, a heat medium/refrigerant heat exchanger 12, a branch portion 13a, a first expansion valve 14a, an indoor evaporator 15, an evaporation pressure adjusting valve 17, a second expansion valve 14b, a chiller 16, a merging portion 13b, and a control device 70. A determining portion 70b circulates a refrigerant to the indoor evaporator 15 and the chiller 16, and determines whether or not a liquid back condition is satisfied in an operation mode in which a flow rate of the refrigerant circulating in the indoor evaporator 15 is a reference flow rate or more for suppressing the accumulation of the refrigeration oil. A decompression control portion 70c controls the second expansion valve 14b so as to reduce refrigerant pressure at an outflow port of the chiller 16 until the refrigerant discharged from the compressor 11 has the degree of overheat, when it is determined to satisfy the liquid back condition.SELECTED DRAWING: Figure 4 【課題】複数の蒸発器を有する冷凍サイクル装置に関し、蒸発器における冷凍機油の滞留と、圧縮機に対する液バックを抑制すると共に、複数の蒸発器を有効に活用できる冷凍サイクル装置を提供する。【解決手段】冷凍サイクル装置１０は、圧縮機１１と、熱媒体冷媒熱交換器１２と、分岐部１３ａと、第１膨張弁１４ａと、室内蒸発器１５と、蒸発圧力調整弁１７と、第２膨張弁１４ｂと、チラー１６と、合流部１３ｂと、制御装置７０を有する。判定部７０ｂは、室内蒸発器１５及びチラー１６に冷媒を流通させると共に、室内蒸発器１５を流通する冷媒流量を、冷凍機油の滞留を抑制する為の基準流量以上とする運転モードにて、液バック条件を満たすか否かを判定する。減圧制御部７０ｃは、液バック条件を満たすと判定された場合、圧縮機１１から吐出される冷媒が過熱度を有するまで、チラー１６の流出口における冷媒圧力を下げるように第２膨張弁１４ｂを制御する。【選択図】図４
Bibliography:Application Number: JP20210069023