EP0153557A2 - Appareil à cycle de réfrigération - Google Patents

Appareil à cycle de réfrigération Download PDF

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Publication number
EP0153557A2
EP0153557A2 EP85100213A EP85100213A EP0153557A2 EP 0153557 A2 EP0153557 A2 EP 0153557A2 EP 85100213 A EP85100213 A EP 85100213A EP 85100213 A EP85100213 A EP 85100213A EP 0153557 A2 EP0153557 A2 EP 0153557A2
Authority
EP
European Patent Office
Prior art keywords
compressor
refrigerant
refrigeration cycle
cycle apparatus
pressure side
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.)
Granted
Application number
EP85100213A
Other languages
German (de)
English (en)
Other versions
EP0153557A3 (en
EP0153557B1 (fr
Inventor
Fumio Mitsubishi Denki K.K Matsuoka
Hitoshi Mitsubishi Denki K.K Iijima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
OFFERTA DI LICENZA AL PUBBLICO
Original Assignee
Mitsubishi Electric Corp
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8193223&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0153557(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to EP85100213A priority Critical patent/EP0153557B1/fr
Priority to EP87109204A priority patent/EP0247638B1/fr
Publication of EP0153557A2 publication Critical patent/EP0153557A2/fr
Publication of EP0153557A3 publication Critical patent/EP0153557A3/en
Application granted granted Critical
Publication of EP0153557B1 publication Critical patent/EP0153557B1/fr
Expired legal-status Critical Current

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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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part

Definitions

  • the present invention relates to refrigerant cycle apparatus.
  • a conventional refrigeration cycle apparatus includes a compressor, a condenser, an expansion device such as a capillary tube or an expansion valve, and an evaporator with these components sequentially coupled in series with each other.
  • the compressor When the compressor is stopped, the pressure of the refrigerant on a high pressure side is balanced with the pressure of the refrigerant on the low pressure side.
  • the compressor As the compressor is started, the difference between the pressures of the high pressure side and the low pressure side is gradually increased until the apparatus is brought to an ordinary operating state.
  • the compressor is accordingly repeatedly started and stopped, the high pressure side refrigerant is balanced in presence with the low pressure side refrigerant each time the apparatus is stopped.
  • refrigerant liquid stored on the low pressure side in an evaporator is drawn into the compressor.
  • the presence of the liquid refrigerant in the condenser increases the load on the compressor at the time of restarting the compressor. This lowers the coefficient of performance (hereinafter abbreviated as "COP") of the apparatus as compared with
  • An object of the invention is to simplify the construction of such apparatus thus enabling less expensive manufacture and reduction in size.
  • refrigeration cycle apparatus comprising: a compressor, a condenser, an expansion means and an evaporator connected in series with each other; means for repeatedly starting and stopping said compressor; and means for isolating refrigerant on a high pressure side of said compressor from said refrigerant on a low pressure side of said compressor when said compressor is stopped, characterised in that said expansion means comprises at least one capillary tube and in that said isolating means comprises a switching element provided adjacent one said capillary tube adapted to fully close when said compressor is stopped and to fully open when said compressor is started, and a first check valve provided between an outlet of said compressor and an inlet of said condenser.
  • Another object of the invention is to enable the expansion coefficient of the apparatus to be varied between the heating and cooling modes in a simple manner.
  • Reference numeral 1 designates generally a compressor.
  • a refrigerant gas compressed at high temperature and high pressure by the compressor 1 is fed through a check valve 2 and a four-way valve 3 into a condenser 4.
  • the refrigerant dissipates heat in the condenser 4 and is condensed to a high temperature and high pressure liquid.
  • the refrigerant liquid, increased in temperature and pressure by the condenser 4 is passed through a capillary tube 12 where the refrigerant becomes a low temperature, low pressure liquid and a switching element 14 which acts as a valve and from there is introduced into an evaporator 7.
  • the low temperature and low pressure refrigerant liquid in the evaporator 7 absorbs heat and thus evaporates to a gas.
  • This refrigerant gas is again fed through the four-way valve 3 into an accumulator 8 which isolates the refrigerant liquid which cannot be evaporated in the evaporator 7 and is retained in the liquid state and which returns only the refrigerant gas again to the compressor 1. While the compressor 1 is operating, the apparatus repeats the refrigeration cycle.
  • Reference numeral 9 illustrates a fan for the condenser 4 and 10 a fan for the evaporator 7.
  • the four-way valve 3 is a change-over or switching valve which operates so that the condenser 4 can be used as an evaporator and the evaporator 7 used as a condenser.
  • the evaporator 7 is used as an indoor side heat exchanger
  • the condenser 4 is used as an outdoor side heat exchanger.
  • the apparatus is operated in a refrigeration cycle which in the heating mode is switched by the four-way valve 3 so that the indoor side heat exchanger 7 is used as a condenser and the outdoor side heat exchanger 4 is used as an evaporator.
  • the air temperature conditioning system operates to detect the temperature in the room by a temperature detector or thermostat (not shown) and to start or stop the compressor 1 so as to maintain the room temperature at a set temperature by operating or stopping the refrigeration cycle apparatus.
  • the switching element 14, which isolates the compressor 1, is constructed so as to open when the compressor 1 is started and to close when the compressor 1 is stopped.
  • the element 14 and the check valve 2 function to isolate high pressure side refrigerant and low pressure side refrigerant when the compressor 1 is stopped.
  • the high pressure side refrigerant in the refrigeration cycle is isolated from the low pressure side refrigerant. Since the element 14 is then opened, a desired pressure difference between the high and low pressure side refrigerant can be attained in short time and the apparatus can reach the ordinary operating state in short time.
  • the conventional refrigerant cycle not incorporating such an isolating device requires about five minutes to reach the ordinary operation state after restarting.
  • the refrigeration cycle apparatus of the invention requires only about one minute and twenty seconds to make the transition.
  • the aforesaid switching element 14 may be a solenoid valve 5 or another type of switching valve and may be any type which closes when the compressor 1 is stopped and opens when the compressor 1 is started.
  • a further capillary tube 13 in parallel with a check valve 15 which is constructed to pass the refrigerant in the illustrated cooling mode and to block the refrigerant in the non-illustrated heat ' ing mode with the valve 3 switched to its other position.
  • the check valve 15 is provided to effectively alter the length of the total capillary tube 12, 13 since the apparatus will operate more efficiently if the expansion coefficient of the refrigerant is varied between the cooling mode and the heating mode in such a manner that the capillary tube is effectively increased in length in the heating mode.
  • the apparatus can be inexpensively constructed, even if the check valve 15 is added.
  • the switching element 14 is constructed to compare the pressure P 2 , determined by the output side refrigerant gas temperature of the evaporator 7 as detected by a heat sensitive tube provided between the outlet of the evaporator 7 and the inlet of the compressor 1, with the pressure P 1 of the refrigerant exhausted from the capillary tube 12, and to open when P 2 > P 1 and to close when P 2 ⁇ P 1 , in the same manner as described above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
EP85100213A 1981-10-20 1981-10-20 Appareil à cycle de réfrigération Expired EP0153557B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP85100213A EP0153557B1 (fr) 1981-10-20 1981-10-20 Appareil à cycle de réfrigération
EP87109204A EP0247638B1 (fr) 1981-10-20 1981-10-20 Appareil à cycle de réfrigération

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP85100213A EP0153557B1 (fr) 1981-10-20 1981-10-20 Appareil à cycle de réfrigération

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP81108580.2 Division 1981-10-20

Publications (3)

Publication Number Publication Date
EP0153557A2 true EP0153557A2 (fr) 1985-09-04
EP0153557A3 EP0153557A3 (en) 1986-02-19
EP0153557B1 EP0153557B1 (fr) 1989-05-17

Family

ID=8193223

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85100213A Expired EP0153557B1 (fr) 1981-10-20 1981-10-20 Appareil à cycle de réfrigération

Country Status (1)

Country Link
EP (1) EP0153557B1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5564280A (en) * 1994-06-06 1996-10-15 Schilling; Ronald W. Apparatus and method for refrigerant fluid leak prevention
US5651267A (en) * 1993-02-09 1997-07-29 Empresa Brasileira De Compressores S/A - Embraco Starting arrangement for small refrigeration systems

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR811326A (fr) * 1936-01-21 1937-04-12 Sulzer Ag Machine frigorifique à compression
US2720756A (en) * 1954-12-29 1955-10-18 Gen Electric Heat pump, including fixed flow control means
US2969655A (en) * 1959-05-19 1961-01-31 Ranco Inc Reversible heat pump system
US3093976A (en) * 1962-04-20 1963-06-18 Carl O Walcutt Refrigeration system including receiver
US3131549A (en) * 1962-11-29 1964-05-05 Carrier Corp Heat pump control
US4081971A (en) * 1976-09-17 1978-04-04 The Trane Company Air cooled centrifugal refrigeration machine with provision to prevent evaporator freezing
US4267702A (en) * 1979-08-13 1981-05-19 Ranco Incorporated Refrigeration system with refrigerant flow controlling valve

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5651267A (en) * 1993-02-09 1997-07-29 Empresa Brasileira De Compressores S/A - Embraco Starting arrangement for small refrigeration systems
US5564280A (en) * 1994-06-06 1996-10-15 Schilling; Ronald W. Apparatus and method for refrigerant fluid leak prevention

Also Published As

Publication number Publication date
EP0153557A3 (en) 1986-02-19
EP0153557B1 (fr) 1989-05-17

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