EP1696189B1 - Klimaanlage mit mehreren Kompressoren - Google Patents

Klimaanlage mit mehreren Kompressoren Download PDF

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Publication number
EP1696189B1
EP1696189B1 EP05004194.6A EP05004194A EP1696189B1 EP 1696189 B1 EP1696189 B1 EP 1696189B1 EP 05004194 A EP05004194 A EP 05004194A EP 1696189 B1 EP1696189 B1 EP 1696189B1
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EP
European Patent Office
Prior art keywords
refrigerant
compressor
accumulator
air
compressors
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
EP05004194.6A
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English (en)
French (fr)
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EP1696189A1 (de
Inventor
Cheol-Min Kim
Eun-Jun Hyundai Hometown Apt. 102-1304 Cho
Yoon-Jei Hwang
Yun-Ho Ryu
Chan-Ho Song
Won-Hee Lee
Chang-Min Choi
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LG Electronics Inc
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LG Electronics Inc
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Filing date
Publication date
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Priority to EP05004194.6A priority Critical patent/EP1696189B1/de
Publication of EP1696189A1 publication Critical patent/EP1696189A1/de
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Publication of EP1696189B1 publication Critical patent/EP1696189B1/de
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/006—Accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/001—Compression machines, plants or systems with reversible cycle not otherwise provided for with two or more accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/025—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units
    • F25B2313/0253—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units in parallel arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/07—Details of compressors or related parts
    • F25B2400/075—Details of compressors or related parts with parallel compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/07—Details of compressors or related parts
    • F25B2400/075—Details of compressors or related parts with parallel compressors
    • F25B2400/0751—Details of compressors or related parts with parallel compressors the compressors having different capacities
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B31/00—Compressor arrangements
    • F25B31/002—Lubrication
    • F25B31/004—Lubrication oil recirculating arrangements

Definitions

  • the present invention relates to an air-conditioner and, more particularly, to an air-conditioner having four compressors according to the preamble of claim 1.
  • a heat-pump type air-conditioner can be operable both for air-cooling and air-heating.
  • the heat-pump type air-conditioner can be used both as an air-cooling device and as an air-heating device by making a refrigerant of a refrigerating cycle to flow reversely.
  • Figure 1 shows the construction of a refrigerating cycle of the heat-pump type air-conditioner in accordance with a conventional art.
  • the conventional heat-pump type air-conditioner includes an indoor heat exchanger 102 installed indoors and performing air-cooling or air-heating, an outdoor heat exchanger 104 disposed outdoors and heat-exchanged with outdoor air; a four-way valve 106 for switching a flow of a refrigerant in a forward direction or a backward direction; an expansion valve 110 installed at a refrigerant pipe connecting the outdoor heat exchanger 104 and the indoor heat exchanger 102 and changing a refrigerant gas to have a low temperature and low pressure, compressors 112, 114, 116 and 118 for compressing a refrigerant to have a high temperature and high pressure, and an accumulator 130 connected to the compressors 112, 114, 116 and 118 by discharge pipes 120, 122, 124 and 126, separating the refrigerant into a gas and a liquid, and supplying the gaseous refrigerant to each compressor 112, 114, 116 and 118.
  • the compressors are the first compressor 112, the second compressor 114, the third compressor 116 and the fourth compressor 118, and check valves 140 are installed at discharge sides of each compressor 112, 114, 116 and 118 to prevent the refrigerant from flowing backward.
  • the accumulator 130 having a large capacity separates the refrigerant sucked through the refrigerant pipe 142 into a gas and a liquid and distributes the gaseous refrigerant to the first to fourth compressors 112, 114, 116 and 118.
  • the accumulator 130 includes a case 150 connected to the refrigerant pipe 142 through which the refrigerant is sucked thereinto and having a hermetic space, first to fourth discharge tubes 160, 162, 164 and 166 inserted for as long as a prescribed length into the case 150 from the lower side of the case 150 and supplying a gas refrigerant gasificated inside the case 150 to each compressor 112, 114, 116 and 118, a screen 152 installed at an upper portion inside the case 150, and a tube holder 154 for supporting the discharge tubes 160, 162, 164 and 166 inserted inside the case 150.
  • Oil contained in the refrigerant introduced through the refrigerant pipe 142 is stored at the side portion of the case 150, and oil retrieval holes 156 are formed respectively at one portion of the first to fourth discharge tubes 160, 162, 164. and 166. Accordingly, the oil stored at the lower portion of the case 150 is sucked into the oil retrieval holes 156 by virtue of a pressure of the refrigerant flowing in the first to fourth discharge tubes 160, 162, 164 and 166, and retrieved to each compressor 112,114,116 and 118, thereby performing a lubricating operation of the compressors.
  • the conventional heat-pump type air-conditioner has the following problems.
  • first to fourth discharge tubes 160, 162, 164 and 166 which are respectively connected to the four compressors 112, 114, 116 and 118, are installed in one accumulator 130, the amount of oil sucked through each discharge tube 160, 162, 164 and 166 differs, and thus, some compressor(s) to which relatively less oil is retrieved can be damaged due to oil shortage.
  • JP 08-159580 A discloses an air-conditioner with a configuration including two compressors and three accumulators. Moreover in JP 2006-023022 A an air-conditioner has a configuration in which a plurality of outdoor units are connected in parallel to increase freezing capability. The outdoor units are connected to two compressors and one accumulator is connected to the two compressors to provide a gaseous coolant, respectively.
  • one object of the present invention is to provide an air-conditioner having multiple compressors, wherein oil is supplied uniformly to the compressors.
  • an air-conditioner having four compressors including: an indoor heat-exchanger disposed indoors and heat-exchanging indoor air; an outdoor heat-exchanger disposed outdoors and heat-exchanging a refrigerant with external air; an expansion valve installed at a refrigerant pipe connecting the indoor heat-exchanger and the outdoor heat-exchanger and changing the refrigerant to have a low temperature and low pressure; four compressors for compressing the refrigerant to change the refrigerant to have a high temperature and high pressure; and three accumulators disposed at a suction side of the four compressors and separating the refrigerant into a gas and a liquid to supply a gaseous refrigerant to the compressors.
  • the compressors are first, second, third and fourth compressors. Each compressor can have the same capacity or compressors with different capacities are applied at various rates.
  • the accumulators include a first accumulator for receiving the refrigerant and separating it into a gas and a liquid; a second accumulator connected to the first accumulator by a refrigerant pipe and connected to the first and second compressors; and a third accumulator connected to the first accumulator by a refrigerant pipe and connected to the third and fourth compressors.
  • the second accumulator is connected to the first compressor by a first pipe and to the second compressor by a second pipe, separates the refrigerant supplied to the first accumulator into a gas and a liquid, and supplies the gaseous refrigerant to the first and second compressors.
  • the third accumulator is connected to the third compressor by a third pipe and to the fourth compressor by a fourth pipe, separates the refrigerant supplied to the first accumulator into a gas and a liquid, and supplies the gaseous refrigerant to the third and fourth compressors.
  • Figure 3 shows the construction of a refrigerant cycle of a heat-pump type air-conditioner in accordance with the present invention.
  • the air-conditioner of the present invention includes an indoor heat-exchanger 2 disposed indoors and heat-exchanged with indoor air; outdoor heat-exchangers 4 and 6 disposed outdoors and heat-exchanged with external air; a four-way valve 8 for switching a flow of a refrigerant in a forward direction or a backward direction; compressors 20, 22, 24 and 26 for compressing the refrigerant to change it to have a high temperature and high pressure; and a plurality of accumulators 30, 32 and 35 for separating the refrigerant supplied to the compressors 20, 22, 24 and 26 into a gas and a liquid.
  • the outdoor heat-exchangers 4 and 6 are first outdoor heat exchanger 4 and second outdoor heat exchanger 6.
  • Expansion valves 10 are installed at refrigerant pipes 12 and 14 connecting the outdoor heat exchangers 4 and 6 and the indoor heat exchanger 2 in order to change the refrigerant to a low temperature and low pressure state.
  • the compressors refer to the first compressor 20, the second compressor 22, the third compressor 24 and the fourth compressor 26.
  • the compressors 20, 22, 24 and 26 may have the same capacity. Or, compressors having different capacities at several rates can be adopted.
  • Check valves 16 are installed at each discharge side of the compressors 20, 22, 24 and 26 in order to prevent the refrigerant from flowing backward.
  • the accumulators 30, 32 and 34 include a first accumulator 30 connected to a four-way valve 8 by a refrigerant pipe 18 and separating the refrigerant introduced into the refrigerant pipe 18 into a gas and a liquid; a second accumulator 32 connected to the first accumulator 30 by the refrigerant pipe 40 and connected to the first and second compressors 20 and 22, and a third accumulator 34 connected to the first accumulator 30 by a refrigerant pipe 42 and connected to the third and fourth compressors 24 and 26.
  • the second accumulator 32 is connected to the first compressor 20 by a first pipe 50 and to the second compressor 22 by a second pipe 52, so that it can separate the refrigerant supplied to the first accumulator 30 into a gas and a liquid and supply the gaseous refrigerator to the first and second compressors 20 and 22.
  • the third accumulator 34 is connected to the third compressor 24 by a third pipe 54 and to the fourth compressor 26 by a fourth pipe 56, so that it can separate the refrigerant supplied to the first accumulator 30 into a gas and a liquid and supply the gaseous refrigerant to the third and fourth compressors 24 and 26.
  • the first, second and third accumulators have the same structure and may differ in their sizes depending on capacities of the compressors.
  • the first accumulator 30 has the following structure.
  • the first accumulator 30 includes a case 60 connected to the four-way valve 8 by the refrigerant pipe 18 and having a hermetic space into which the refrigerant is sucked, first and second discharge tubes 62 and 64 inserted for as long as a prescribed length into the case 60 from the lower side of the case 60 and supplying a gaseous refrigerant gasificated inside the case 60 to the second and third accumulators 32 and 34, a screen 66 installed at an upper portion inside the case 60, and a tube holder 68 supporting the discharge tubes 62 and 64 installed inside the case 60.
  • Oil contained in the refrigerant sucked into the case 60 is stored at a lower portion inside the case 60, and oil retrieving holes 70 and 72 are formed at one portion of the first and second discharge tubes 62 and 64 sunk in the oil, so that oil stored at the lower portion of the case 60 is sucked through the oil retrieving holes 70 and 72 and retrieved to each compressor.
  • the oil stored in the case 60 has a suction force by virtue of a pressure of the refrigerant passing the first and second discharge tubes 62 and 64.
  • the air-conditioner constructed as described above in accordance with the present invention operates as follows.
  • the refrigerant is gasificated and separated into a liquid and a gas in the first accumulator 30, and oil contained in the refrigerant is stored at a lower portion of the first accumulator 30.
  • the gaseous refrigerant which has been gasificated in the first accumulator is supplied to the second accumulator 32 through the first discharge tube 62 and the refrigerant pipe 40, and also to the third accumulator 34 through the second discharge tube 64 and the refrigerant pipe 42.
  • the oil stored at the lower portion of the first accumulator 30 is sucked through the oil retrieving holes 70 and 72 formed at the first and second discharge tubes 62 and 64 and supplied together with the gaseous refrigerant to the second and third accumulators 32 and 34.
  • the refrigerant which has been supplied in the second accumulator 32 is separated into a gas and a liquid, and the gaseous refrigerant after being gasificated in the second accumulator is supplied to the first compressor 20 through the first pipe 50 and to the second compressor 22 through the second pipe 52.
  • the oil stored in the second accumulator 32 is retrieved together with the gaseous refrigerant into the first and second compressors 20 and 22 through the first and second pipes 50 and 52, to perform a lubricating operation of the compressors.
  • the refrigerant and the oil are supplied only the two compressors 20 and 22 from the second accumulator 32, so that the amount of oil supplied to the first and second compressors 20 and 22 can be maintained constantly.
  • the refrigerant supplied to the third accumulator 34 is separated into a gas and a liquid, and the gaseous refrigerant after being gasified in the third accumulator 34 is supplied together with the oil stored in the third accumulator 34 to the third compressor 24 through the third pipe 54 and also to the fourth compressor 26 through the fourth pipe 56.
  • the oil is supplied only to the two compressors 24 and 26 from the third accumulator 34, the amount of oil supplied to the third and fourth compressors 24 and 26 can be maintained constantly.
  • the air-conditioner having four compressors in accordance with the present invention has the following advantages.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Power Engineering (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)

Claims (7)

  1. Klimagerät mit vier Kompressoren (20, 22, 24, 26) umfassend:
    einen Innenwärmetauscher (2) innerhalb des Gebäudes, der im Gebäude zum Wärmetausch der Innenraumluft angeordnet ist;
    einen Außenwärmetauscher (4, 6) außerhalb des Gebäudes, der im Freien zum Wärmetausch eines Kältemittels mit der Außenluft angeordnet ist;
    ein Expansionsventil (10), das an einer Kältemittel-Verbindungsleitung zwischen dem Innenwärmetauscher und dem Außenwärmetauscher montiert ist;
    vier Kompressoren (20, 22, 24, 26) zum Komprimieren des Kältemittels, sodass das Kältemittel eine hohe Temperatur und einen hohen Druck aufweist, wobei die Kompressoren ein erster Kompressor (20), ein zweiter Kompressor (22), ein dritter Kompressor (24) und ein vierter Kompressor (26) sind;
    wobei das Klimagerät drei Akkumulatoren (30, 32, 34) umfasst, die am Ansaugkanal der vier Kompressoren (20, 22, 24, 26) zum Trennen des Kältemittels in Gas und Flüssigkeit angeordnet sind, sodass den Kompressoren ein gasförmiges Kältemittel zugeführt wird;
    wobei die Akkumulatoren (30, 32, 34) umfassen:
    einen ersten Akkumulator (30) zum Aufnehmen des Kältemittels vom Innenwärmetauscher (2) und Trennen des Kältemittels in ein Gas und eine Flüssigkeit;
    einen zweiten Akkumulator (32), der mit dem ersten Akkumulator (30) durch eine Kältemittelleitung sowie mit dem ersten Kompressor (20) und dem zweiten Kompressor (22) verbunden ist, wobei der zweite Akkumulator (32) das Kältemittel vom ersten Akkumulator (30) aufnimmt und das Kältemittel in ein Gas und eine Flüssigkeit trennt; und
    einen dritten Akkumulator (34), der mit dem ersten Akkumulator (30) durch eine Kältemittelleitung (42) sowie mit dem dritten Kompressor (24) und dem vierten Kompressor (26) verbunden ist, wobei der dritte Akkumulator (34) das Kältemittel vom ersten Akkumulator (30) aufnimmt und das Kältemittel in ein Gas und eine Flüssigkeit trennt;
    dadurch gekennzeichnet, dass der zweite Akkumulator (32) mit dem ersten Kompressor (20) durch eine erste Leitung (50) und mit dem zweiten Kompressor (22) durch eine zweite Leitung (52) zum Trennen des Kältemittels, das dem ersten Akkumulator (30) zugeführt wird, in ein Gas und eine Flüssigkeit, sodass das gasförmige Kältemittel dem ersten Kompressor (20) und dem zweiten Kompressor (22) zugeführt wird; und
    dass der dritte Akkumulator (34) mit dem dritten Kompressor (24) durch eine dritte Leitung (54) und mit dem vierten Kompressor (26) durch eine vierte Leitung (26) zum Trennen des Kältemittels, das dem ersten Akkumulator (30) zugeführt wird, in ein Gas und eine Flüssigkeit, sodass das gasförmige Kältemittel dem dritten Kompressor (24) und dem viertem Kompressor (26) zugeführt wird.
  2. Klimagerät nach Anspruch 1, wobei jeder Kompressor (20, 22, 24, 26) die gleiche Kapazität aufweisen kann, oder die Kompressoren (20, 22, 24, 26) mit unterschiedlichen Kapazitäten an verschiedene Geschwindigkeiten angepasst werden.
  3. Klimagerät nach Anspruch 2, wobei an jedem Auslasskanal der Kompressoren Rückschlagventile (16) montiert sind, um einen Rückfluss des Kältemittels zu verhindern.
  4. Klimagerät nach Anspruch 1, wobei der Innenwärmetauscher (2) die Luft abkühlt oder erwärmt und das Klimagerät des Weiteren umfasst:
    ein Vier-Wege-Ventil (8) zum Umschalten eines Durchflusses des Kältemittels in eine Vorwärtsrichtung oder eine Rückwärtsrichtung.
  5. Klimagerät nach Anspruch 4, wobei jeder Kompressor (20, 22, 24, 26) die gleiche Kapazität aufweisen kann, oder die Kompressoren (20, 22, 24, 26) mit unterschiedlichen Kapazitäten an verschiedene Geschwindigkeiten angepasst werden.
  6. Klimagerät nach Anspruch 5, wobei an jedem Auslasskanal der Kompressoren (20, 22, 24, 26) Rückschlagventile (16) montiert sind, um einen Rückfluss des Kältemittels zu verhindern.
  7. Klimagerät nach einem der Ansprüche 1 bis 6, wobei jeder Akkumulator (30, 32, 34) umfasst:
    ein Gehäuse (60), das mit einer Kältemittelleitung (18, 40, 42) zum Ansaugen des Kältemittels und Speichern des im Kältemittel enthaltenen Öls in einem unteren Abschnitt des Gehäuses (60) verbunden ist, und
    zwei Ablassrohre (62, 64), die in das Gehäuse (60) von einem unteren Abschnitt des Gehäuses (60) eingesetzt sind, um ein gasförmiges Kältemittel nach der Vergasung innerhalb des Gehäuses (60) abzulassen,
    wobei Ölansaugöffnungen (70, 72) an jedem unteren Abschnitt der beiden Ablassrohre (62, 64), die in das Gehäuse (60) eingesetzt wurden, ausgebildet sind, um das im Gehäuse (60) angesammelte Öl abzusaugen.
EP05004194.6A 2005-02-25 2005-02-25 Klimaanlage mit mehreren Kompressoren Expired - Fee Related EP1696189B1 (de)

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Application Number Priority Date Filing Date Title
EP05004194.6A EP1696189B1 (de) 2005-02-25 2005-02-25 Klimaanlage mit mehreren Kompressoren

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Application Number Priority Date Filing Date Title
EP05004194.6A EP1696189B1 (de) 2005-02-25 2005-02-25 Klimaanlage mit mehreren Kompressoren

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EP1696189B1 true EP1696189B1 (de) 2017-09-27

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007018427A1 (de) * 2007-04-17 2008-10-23 Behr Gmbh & Co. Kg Fluidsammler
CN101392968B (zh) * 2007-09-20 2011-01-05 无锡同方人工环境有限公司 一种大容量多联式空调/热泵机组
DE102015107719A1 (de) * 2015-05-18 2016-11-24 Denso Automotive Deutschland Gmbh Kältemittel-Akkumulator für einen Kältemittelkreislauf und Kältemittelkreislauf mit einem solchen Kältemittel-Akkumulator

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JP3197768B2 (ja) * 1994-11-30 2001-08-13 三洋電機株式会社 冷凍装置
JPH08200892A (ja) * 1995-01-20 1996-08-06 Mitsubishi Electric Corp 冷凍装置
JP3413044B2 (ja) * 1997-02-20 2003-06-03 株式会社日立製作所 空気調和装置
JP3649548B2 (ja) * 1997-03-25 2005-05-18 三菱重工業株式会社 冷凍サイクル
JP3930654B2 (ja) * 1998-11-12 2007-06-13 三菱電機株式会社 冷凍機
JP4333044B2 (ja) * 2001-03-19 2009-09-16 株式会社富士通ゼネラル 空気調和機
JP2003240367A (ja) * 2002-02-14 2003-08-27 Hitachi Ltd 冷凍空気調和装置

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