US-12624266-B2 - Use of composition as refrigerant in compressor, compressor, and refrigeration cycle apparatus

US12624266B2US 12624266 B2US12624266 B2US 12624266B2US-12624266-B2

Abstract

The propagation of a disproportionation reaction of a refrigerant is suppressed. Disclosed is a method of using a composition as a refrigerant in a compressor, in which the composition includes one or more compounds selected from the group of ethylene-based fluoroolefins, 2,3,3,3-tetrafluoropropene, and 1,3,3,3-tetrafluoropropene, and the dimension of a gap of a predetermined portion through which the refrigerant flows around an ignition energy generation portion in the compressor is less than or equal to 2 mm.

Inventors

Takashi Usui
Tomoyuki GOTOU
Takashi Yoshimura
Yuuko ITOU
Yuka Watanabe
Takuma IWASAKA
Youhei TAKAKURA
Yuuki YOTSUMOTO

Assignees

DAIKIN INDUSTRIES, LTD.

Dates

Publication Date: 20260512
Application Date: 20230111
Priority Date: 20200715

Claims (2)

1 . A compressor for compressing a refrigerant, the refrigerant comprising one or more compounds selected from the group consisting of ethylene-based fluoroolefins, 2,3,3,3-tetrafluoropropene, and 1,3,3,3-tetrafluoropropene, wherein: a dimension of a gap of a predetermined portion through which the refrigerant flows around an ignition energy generation portion in the compressor is less than or equal to 2 mm.
2 . A refrigeration cycle apparatus comprising a refrigerant circuit including the compressor of claim 1 .

Description

CROSS REFERENCE TO RELATED APPLICATIONS This application is a Continuation of PCT International Application No. PCT/JP2021/025498, filed on Jul. 6, 2021, which claims priority under 35 U.S.C. 119(a) to Patent Application No. JP 2020-121383, filed in Japan on Jul. 15, 2020, all of which are hereby expressly incorporated by reference into the present application. TECHNICAL FIELD The present disclosure relates to the use of a composition as a refrigerant in a compressor, the compressor, and a refrigeration cycle apparatus. BACKGROUND ART Conventionally, hydrofluoroolefins (HFO refrigerants) having lower global warming potential (hereinafter also simply referred to as GWP) than HFC refrigerants have attracted attention for refrigeration apparatuses. For example, 1,2-difluoroethylene (HFO-1132) is considered as a refrigerant with low GWP in Patent Literature 1 (Japanese Patent Laid-Open No. 2019-196312). SUMMARY The use of a composition as a refrigerant in a compressor according to a first aspect is the use of a composition as a refrigerant in a compressor in which the dimension of a gap of a predetermined portion in the compressor is less than or equal to 2 mm. The predetermined portion is a portion through which the refrigerant flows around an ignition energy generation portion in the compressor. The composition includes one or more compounds selected from the group consisting of ethylene-based fluoroolefins, 2,3,3,3-tetrafluoropropene (HFO-1234yf), and 1,3,3,3-tetrafluoropropene (HFO-1234ze). BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram of a refrigeration cycle apparatus. FIG. 2 is a block configuration diagram of the refrigeration cycle apparatus. FIG. 3 is a side cross-sectional view illustrating a schematic configuration of a compressor. FIG. 4 is a plan cross-sectional view illustrating a region around a cylinder chamber of the compressor. FIG. 5 is a schematic cross-sectional view illustrating the details of a region around adjacent portions of coils. FIG. 6 is a schematic cross-sectional view illustrating the details of a region around a portion where a bearing portion and a crankshaft are adjacent to each other. DESCRIPTION OF EMBODIMENTS Hereinafter, a compressor, a refrigeration cycle apparatus, and the use of a composition as a refrigerant in such a compressor or an apparatus will be specifically described with reference to examples. However, the following description is not intended to limit the present disclosure. (1) Refrigeration Cycle Apparatus 1 A refrigeration cycle apparatus 1 is an apparatus for performing vapor-compression refrigeration cycles to process a heat load of a target space. For example, the refrigeration cycle apparatus 1 is an air-conditioning apparatus for conditioning air in a target space. FIG. 1 is a schematic configuration diagram of the refrigeration cycle apparatus. FIG. 2 is a block configuration diagram of the refrigeration cycle apparatus. The refrigeration cycle apparatus 1 mainly includes an outdoor unit 20; an indoor unit 30; a liquid-side refrigerant communication pipe 6 and a gas-side refrigerant communication pipe 5 each connecting the outdoor unit 20 and the indoor unit 30; a remote controller (not illustrated); and a controller 7 that controls the operation of the refrigeration cycle apparatus 1. In the refrigeration cycle apparatus 1, refrigeration cycles are performed such that a refrigerant enclosed in a refrigerant circuit 10 is compressed, and is then cooled or condensed, and is then decompressed, and is then heated or evaporated, and is then compressed again. In the present embodiment, the refrigerant circuit 10 is filled with a refrigerant for performing vapor-compression refrigeration cycles. (2) Refrigerant Examples of the refrigerant filling the refrigerant circuit 10 include one or more compounds selected from the group consisting of ethylene-based fluoroolefins, 2,3,3,3-tetrafluoropropene (HFO-1234yf), and 1,3,3,3-tetrafluoropropene (HFO-1234ze). Note that regarding the burning velocity defined by the ISO 817, 1,3,3,3-tetrafluoropropene (HFO-1234ze) with a burning velocity of 1.2 cm/s is more preferable than 2,3,3,3-tetrafluoropropene (HFO-1234yf) with a burning velocity of 1.5 cm/s. Regarding the LFL (Lower Flammability Limit) defined by the ISO 817, 1,3,3,3-tetrafluoropropene (HFO-1234ze) with a LFL of 65000 vol·ppm or 6.5% is more preferable than 2,3,3,3-tetrafluoropropene (HFO-1234yf) with a LFL of 62000 vol·ppm or 6.2%. In particular, the refrigerant may include one or more compounds selected from the group consisting of 1,2-difluoroethylene (HFO-1132), 1,1-difluoroethylene (HFO-1132a), 1,1,2-trifluoroethylene (HFO-1123), monofluoroethylene (HFO-1141), and perhaloolefins. Above all, the refrigerant, including 1,2-difluoroethylene (HFO-1132) and/or 1,1,2-trifluoroethylene (HFO-1123), is preferable. Herein, examples of ethylene-based fluoroolefins include 1,2-difluoroethylene (HFO-1132), 1,1-difluoroethylene (HFO