WO2011114555A1 - Appareil à cycle de réfrigération - Google Patents

Appareil à cycle de réfrigération Download PDF

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Publication number
WO2011114555A1
WO2011114555A1 PCT/JP2010/066618 JP2010066618W WO2011114555A1 WO 2011114555 A1 WO2011114555 A1 WO 2011114555A1 JP 2010066618 W JP2010066618 W JP 2010066618W WO 2011114555 A1 WO2011114555 A1 WO 2011114555A1
Authority
WO
WIPO (PCT)
Prior art keywords
refrigerant
refrigeration cycle
cycle apparatus
piston
vane
Prior art date
Application number
PCT/JP2010/066618
Other languages
English (en)
Inventor
Masao Nakano
Noboru Iida
Daisuke Funakoshi
Tsuyoshi Karino
Original Assignee
Panasonic Corporation
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from JP2010060626A external-priority patent/JP2010243148A/ja
Application filed by Panasonic Corporation filed Critical Panasonic Corporation
Priority to CN2010800351807A priority Critical patent/CN102472533A/zh
Priority to US13/388,192 priority patent/US20120131947A1/en
Priority to EP10763470A priority patent/EP2547969A1/fr
Publication of WO2011114555A1 publication Critical patent/WO2011114555A1/fr

Links

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
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F25B1/04—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type

Definitions

  • the present invention relates to a high-reliability refrigeration cycle apparatus, such as room air conditioner, refrigerator or air conditioning apparatus, using a refrigerant mainly containing a chlorine atom-free low- global warming potential hydrofluoroolefin having a carbon- carbon double bond as its operating refrigerant and employing a rotary compressor as its compressor.
  • FIG. 5 is a crosssectional view of a rotary compressor used with the conventional HFC (hydrofluorocarbon)-based refrigerant described in Patent Document 1.
  • a piston 43 is inserted along the internal surface of a cylinder 41 and revolves with revolution of a shaft 42, and a refrigerant gas is suctioned and compressed respectively in a suction chamber 45 and a compression chamber 46 partitioned by a vane 44.
  • the areas of the rotary compressor abraded most intensively are where the terminal region of the vane 44 and the external surface of the piston 43 are in contact with each other, and high discharge pressure is applied to a rear face of the vane 44, the end of the vane 44 is pressed onto the external surface of the piston 43 by line contact, intensively by the pressure difference between the discharge pressure and the pressure in the cylinder, leading to increase in surface pressure and boundary lubrication.
  • the vane was subjected to nitridation treatment or CrN or TiN ion plating on the surface, for improvement of its abrasion resistance and assurance of reliability.
  • FIG. 6 is a crosssectional view illustrating a swing rotary compressor used with the conventional HFC (hydrofluorocarbon)-based refrigerant described in Patent Document 2. It is a swing rotary compressor having a piston 53 consisting of a roller 53a and a vane 54 formed as integrated with the roller 53a.
  • the vane 54 is held slidably between two semi-cylindrical sliding parts 57 in a cylindrical hole unit 51a formed outside the internal surface of a cylinder 51; the piston 53 is inserted into the cylinder 51 from the internal surface for movement thereof by revolution of a shaft 52, and the refrigerant gas is suctioned and compressed respectively in a suction chamber 55 and a compression chamber 56 partitioned by the vane 54.
  • roller 53a and the vane 54 are formed as an integrated structure in the swing rotary compressor, differently from the rotary compressor described in Patent Document 1, the vane terminal region and the piston external surface are not in contact with each other, and the semi-cylindrical sliding parts and the cylindrical hole unit 51a formed in the cylinder 51 are in surface contact with each other, and thus, the sliding state is relaxed.
  • Patent Document 1 JP-A 11-236890
  • Patent Document 2 JP-A 2003-106692
  • An object of the present invention which was made to solve the problems of traditional technology, is to provide a cost-effective compressor that is resistant to decomposition of its refrigerant, as the sliding heat is reduced by alteration of the contact between the vane terminal region and the piston external surface from line contact to surface contact, and thus, assures reliability of the compressor and yet retains the configuration of conventional rotary compressors as much as possible.
  • the refrigeration cycle apparatus which achieved the object above, has therein a rotary compressor using a single refrigerant of a hyd rof luoroolef in having a carbon-carbon double bond or a mixed refrigerant containing the hyd rof luorooref in as the primary component and hydrofluorocarbons having no double bond as the operating refrigerant and having a piston eccentrically revolving, as driven by a shaft, in a cylinder, the terminal region of a vane, which partitions the cylinder into a suction chamber and a compression chamber, being slidably connected to the external surface of the piston .
  • the vane terminal region is slidably connected to the piston external surface, leading to change from severe boundary lubrication state of line contact to surface contact lubrication state and the sliding parts are not heated significantly, it is possible in the refrigeration cycle apparatus according to the present invention to reduce generation of hydrogen fluoride that occurs when the refrigerant reacts with water and oxygen and to provide a high-reliability refrigeration cycle apparatus by using a refrigerant mainly containing a chlorine atom-free low-global warming potential hydrofluoroolefin having a carbon-carbon double bond.
  • Figure 1 is a chart showing the system configuration of the refrigeration cycle apparatus in embodiment 1 of the present invention.
  • Figure 2 is a vertical crosssectional view of the rotary compressor in embodiment 1 of the present invention.
  • Figure 3 is a side crosssectional view of the compression mechanism unit in the same rotary compressor.
  • Figure 4 is a figure showing the relationship between the global warming potential of two-component mixture refrigerants and the blending ratio.
  • Figure 5 is a side crosssectiona I view illustrating the compression mechanism unit of a traditional rotary compressor.
  • Figure 6 is a side crosssectional view illustrating the compression mechanism unit of a traditional swing rotary compressor.
  • the first aspect of the invention which relates to a refrigeration cycle apparatus, comprising a rotary compressor, using a single refrigerant of a hydrofluoroolefin having a carbon-carbon double bond or a mixed refrigerant containing the hydrofluoroolefin as the primary component and hydrofluorocarbons having no double bond as the operating refrigerant and having a motor and a compression mechanism unit with a shaft driven by a rotor of the motor in a tightly sealed container, the compression mechanism unit having a piston eccentrically revolving, as driven by a shaft, in a cylinder, the terminal region of a vane, which partitions the cylinder into a suction chamber and a compression chamber, being slidably connected to the external surface of the piston, a condenser cooling the refrigerant gas pressurized, as compressed by the compressor, a throttling mechanism depressurizing the high-pressure refrigerant liquefied by the condenser, and a vaporizer gasifying
  • the second aspect of the invention which relates to the refrigeration cycle apparatus of the first aspect of the invention wherein the terminal region of the rotary compressor vane and the external surface of the piston are slidably connected to each other, by the circular terminal region of the vane and the arc-shaped slot on the external surface of the piston, can reduce temperature rise by sliding, because the connecting parts are both arc-shaped and the contact becomes surface contact.
  • the third aspect of the invention which relates to the refrigeration cycle apparatus of the second aspect of the invention wherein the angle of connection of the arc-shaped slot on the external surface of the piston to the circular terminal region of the vane is 180° or more, can suppress separation of the connecting parts and also can expand the contact area, thus reducing surface pressure and temperature rise by sliding.
  • the fourth aspect of the invention which relates to the refrigeration cycle apparatus of the first to third aspects of the invention, wherein the hydrofluoroolefin is a mixed refrigerant containing tetraf luoropropene as the primary component and two or three hydrofluorocarbons having no double bond, such as difluoromethane, pentaf luoroethane and tetrafluoroethane, added thereto at a rate to give a global warming potential of 5 or more and 750 or less, desirably 350 or less, can improve efficiency and minimize the influence on global warming as much as possible, even when the unrecovered refrigerant is discharged into air.
  • the hydrofluoroolefin is a mixed refrigerant containing tetraf luoropropene as the primary component and two or three hydrofluorocarbons having no double bond, such as difluoromethane, pentaf luoroethane and tetrafluoroe
  • the fifth aspect of the invention which relates to the refrigeration cycle apparatus of the first to fourth aspects of the invention, wherein the refrigeration oil is a synthetic oil containing an oxygen-containing organic compound selected from the group consisting of polyoxyalkylene glycols, polyvinylethers, copolymers of poly(oxy)alkylene glycols or the monoether thereof and polyvinylether, polyol esters and polycarbonates as the principal component, or a synthetic oil containing an alkyl benzene or an a-olefin as the principal component, can provide a high-reliability refrigeration cycle apparatus.
  • the refrigeration oil is a synthetic oil containing an oxygen-containing organic compound selected from the group consisting of polyoxyalkylene glycols, polyvinylethers, copolymers of poly(oxy)alkylene glycols or the monoether thereof and polyvinylether, polyol esters and polycarbonates as the principal component, or a synthetic oil containing an alkyl benzene or an a-olefin as
  • Figure 1 is a chart showing the system configuration of the refrigeration cycle apparatus in the first embodiment of the present invention.
  • the refrigeration cycle apparatus of the present embodiment when explained for example as a refrigeration cycle primary for air conditioning, mainly has a compressor 61, a condenser 62, a throttling mechanism 63 and a vaporizer 64, and these devices are connected to each other via a set of piping so that the refrigerant circulates in the system.
  • the refrigeration cycle apparatus contains a refrigerant mainly containing a chlorine atom-free low- global warming potential hydrofluoroolefin having a carbon- carbon double bond sealed therein.
  • Figure 4 is a figure showing the relationship between the global warming potential of a two-component mixture refrigerant of tetrafluoropropene and difluoromethane or pentafluoroethane and the blending ratio.
  • the blending rate of difluoromethane should be 44 wt % or less, to give a GWP of 300 or less; alternatively when tetrafluoropropene and pentafluoroethane are mixed, the blending rate of pentafluoroethane should be 21.3 wt % or less, to give a GWP of 750 or less; and the blending rate of pentafluoroethane should be 8.4 wt % or less, to give a GWP of 300 or less.
  • the refrigerant When the refrigerant is a single refrigerant of tetrafluoropropene, it has a quite favorable GWP value of 4. However, it has a specific volume larger and thus a refrigerating capacity lower than those of the refrigerants mixed with hydrofluorocarbons and, for that reason, demands a larger-scale cooling cycle apparatus. In other words, it is possible to improve the certain properties such as refrigerating capacity and make the refrigerant more easily usable, compared to a single refrigerant of hydrofluoroolefin, by using a mixed refrigerant containing the hydrofluoroolefin having a carbon-carbon double bond as the primary component and the hydrofluorocarbons having no double bond.
  • the amount of the tetrafluoropropene in the refrigerant sealed therein may be selected arbitrarily according to the applications such as the cooling cycle apparatus into which the compressor is incorporated and the conditions such as the restriction on GWP described above.
  • the mixed refrigerant at the rate above has a smaller temperature difference and a behavior closer to a pseudo-azeotropic mixed refrigerant, even though it is a non-azeotropic mixed refrigerant, and thus, can improve the cooling capacity and the cooling capacity coefficient (COP) of the cooling cycle apparatus.
  • COP cooling capacity coefficient
  • the refrigerant is converted to liquid by pressurization and cooling and to gas by depressurization and heating.
  • the compressor 61 which is driven by a motor, pressurizes a low-temperature low- pressure gas refrigerant into a high temperature high- pressure gas refrigerant and feeds the gas into the condenser 62.
  • the gas is condensed in the condenser 62, as it is cooled by air blown for example from a fan, and gives a low-temperature high-pressure liquid refrigerant.
  • the liquid refrigerant is depressu rized by the throttling mechanism 63, giving partially a low-temperature low- pressure gas refrigerant and a low-temperature low- pressure liquid refrigerant, and feeds the liquid refrigerant into the vaporizer 64.
  • the liquid refrigerant is vaporized in the vaporizer 64, as heated by air blown for example form a fan, giving a low-temperature low-pressure gas refrigerant, which is then suctioned into the compressor 61 and pressurized therein. In this way, liquefaction and gasification is repeated therein in the cycle described above.
  • the refrigerating apparatus was described as a refrigeration cycle apparatus primarily for air conditioning in the embodiment above, it is of course possible to operate it as a heating cycle apparatus for example by using a four- way valve.
  • FIG. 2 is a vertical crosssectional view of the rotary compressor used in the refrigeration cycle apparatus shown in Figure 1.
  • a stator 2a of a motor 2 is connected to the upper region of a tightly sealed container 1, and a compression mechanism unit 5 having a shaft 4 driven by a rotor 2b is connected to the lower region of the tightly sealed container 1.
  • a top bearing 7 is connected to the top end of the cylinder 6 of the compression mechanism unit 5 and a bottom bearing 8 to the bottom end thereof, for example with screws.
  • a piston 9 is inserted into the eccentric region 4a of the shaft 4 for eccentric revolution.
  • a refrigeration oil is stored in the bottom region of the tightly sealed container 1, and the refrigeration oil is desirably an oil miscible with the refrigerant and contains at least one oxygen-containing organic compound selected from the group consisting of polyoxyalkylene glycols, polyvinylethers, copolymers of poly(oxy)alkylene glycols or the monoethers thereof and polyvinylether, polyol esters and polycarbonates as the principal component, and additionally, as needed, various additives such as extreme-pressure lubricants, oils, antioxidants, acid scavengers and antifoams are added.
  • Figure 3 is a crosssectional view of the compression mechanism unit of the rotary compressor shown in Figure 2. As shown in Figure 3, a vane 10 is inserted into the vane groove 6a of cylinder 6 and the circular terminal region 10a of the vane 10 is slidably connected to the arc-shaped slot 9a on the external surface of the piston 9.
  • a mixed refrigerant gas containing a hydrofluoroolefin having a carbon-carbon double bond as the primary component and hydrofluorocarbons having no double bond or a single refrigerant gas of a hydrofluoroolefin having a carbon-carbon double bond is suctioned into a suction chamber 12 through a suction hole 11 formed in the cylinder 6.
  • the gas refrigerant in the compression chamber 13 is compressed by the leftward revolution of the piston 9 (arrow direction) and ejected through a discharge slot 14 out of the discharge outlet (not shown in the Figure).
  • the compressed gas refrigerant discharged into the tightly sealed container 1 is then fed though the gap of the motor 2 and discharged out of a discharge pipe 15 formed in the upper region of the tightly sealed container 1, together with the refrigeration oil mist present in the surrounding region.
  • the vane is in surface contact, not in conventional line contact, with the piston and thus, is not exposed to severe environment at high temperature caused by sliding friction, because the circular terminal region 10a of the vane 10 is slidably connected to the arc-shaped slot 9a formed on the external surface of piston 9.
  • the sliding face is less easily exposed to high temperature, it is possible to reduce generation of hydrogen fluoride by decomposition of the mixed refrigerant gas containing a hydrof luoroolef in having a carbon-carbon double bond as the primary component and hyd rof I uorocarbons having no double bond or a single refrigerant gas of a hydrofluoroolefin having a carbon-carbon double bond.
  • the rotary compressor of the refrigeration cycle apparatus is different only, mainly in the shape of the vane and the piston from conventional rotary compressors, and thus, it is possible to produce it cost-effectively without major alteration of production facility.
  • the rotary compressor according to the present invention can assure the reliability of the refrigeration cycle apparatus, even when a mixed refrigerant containing a hydrofluoroolefin having a carbon- carbon double bond as the primary component and hydrofluorocarbons having no double bond is used, and thus, can be used in applications such as water-heating apparatuses, car air-conditioning units, refrigeration cycles and dehumidifier systems.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Lubricants (AREA)
  • Compressor (AREA)

Abstract

La présente invention concerne un appareil à cycle de réfrigération ayant un compresseur qui n'est pas facilement chauffé à une température élevée par chaleur progressive et dont la fiabilité est supérieure. L'invention concerne un appareil à cycle de réfrigération comportant un compresseur économique ayant une configuration selon laquelle un piston 9 à rotation excentrique, à entraînement par arbre 4, est placé dans un cylindre 6 et la région terminale circulaire 10a d'une ailette 10 séparant le cylindre 6 en une chambre d'aspiration 12 et une chambre de compression 13 est raccordée de manière coulissante à la surface extérieure du piston 9 par contact superficiel, qui peut réduire la chaleur progressive avec donc une résistance à la détérioration de la fiabilité par réaction du fluide frigorigène de fonctionnement.
PCT/JP2010/066618 2009-03-17 2010-09-16 Appareil à cycle de réfrigération WO2011114555A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN2010800351807A CN102472533A (zh) 2010-03-17 2010-09-16 制冷循环装置
US13/388,192 US20120131947A1 (en) 2009-03-17 2010-09-16 Refrigeration cycle apparatus
EP10763470A EP2547969A1 (fr) 2010-03-17 2010-09-16 Appareil à cycle de réfrigération

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010-060626 2010-03-17
JP2010060626A JP2010243148A (ja) 2009-03-17 2010-03-17 冷凍サイクル装置

Publications (1)

Publication Number Publication Date
WO2011114555A1 true WO2011114555A1 (fr) 2011-09-22

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Application Number Title Priority Date Filing Date
PCT/JP2010/066618 WO2011114555A1 (fr) 2009-03-17 2010-09-16 Appareil à cycle de réfrigération

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EP (1) EP2547969A1 (fr)
CN (1) CN102472533A (fr)
WO (1) WO2011114555A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101525849B1 (ko) * 2013-07-16 2015-06-05 삼성전자 주식회사 압축기 및 이를 이용한 공기조화기
KR102206102B1 (ko) * 2019-06-20 2021-01-21 엘지전자 주식회사 결합형 베인-롤러 구조의 로터리 압축기

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03185291A (ja) * 1989-12-13 1991-08-13 Matsushita Refrig Co Ltd 回転式圧縮機
JPH11236890A (ja) 1998-02-20 1999-08-31 Sanyo Electric Co Ltd ベーンおよびそれを使用した冷媒圧縮機
JP2003106692A (ja) 1993-12-20 2003-04-09 Hitachi Ltd 冷凍サイクル装置
EP1686330A2 (fr) * 2005-01-31 2006-08-02 Sanyo Electric Co., Ltd. Appareil réfrigérant, réfrigérateur, compresseur et séparateur gaz-liquide
EP1895093A1 (fr) * 2005-06-08 2008-03-05 Matsushita Electric Industrial Co., Ltd. Detendeur rotatif multietage et cycle de refrigeration l utilisant

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1056160A (zh) * 1990-04-22 1991-11-13 黄闯芽 旋转压缩式氢制冷装置
CN2127780Y (zh) * 1992-07-16 1993-03-03 沈太福 新型螺杆式制冷压缩机

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03185291A (ja) * 1989-12-13 1991-08-13 Matsushita Refrig Co Ltd 回転式圧縮機
JP2003106692A (ja) 1993-12-20 2003-04-09 Hitachi Ltd 冷凍サイクル装置
JPH11236890A (ja) 1998-02-20 1999-08-31 Sanyo Electric Co Ltd ベーンおよびそれを使用した冷媒圧縮機
EP1686330A2 (fr) * 2005-01-31 2006-08-02 Sanyo Electric Co., Ltd. Appareil réfrigérant, réfrigérateur, compresseur et séparateur gaz-liquide
EP1895093A1 (fr) * 2005-06-08 2008-03-05 Matsushita Electric Industrial Co., Ltd. Detendeur rotatif multietage et cycle de refrigeration l utilisant

Also Published As

Publication number Publication date
CN102472533A (zh) 2012-05-23
EP2547969A1 (fr) 2013-01-23

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