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
  • F25B31/00—Compressor arrangements
  • F25B31/002—Lubrication
• • 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
  • F25B2500/00—Problems to be solved
  • F25B2500/16—Lubrication
• • 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
  • F25B2600/00—Control issues
  • F25B2600/02—Compressor control
  • F25B2600/025—Compressor control by controlling speed
  • F25B2600/0253—Compressor control by controlling speed with variable speed
• • 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
  • F25B2600/00—Control issues
  • F25B2600/25—Control of valves
  • F25B2600/2513—Expansion valves
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
  • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
  • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

• This invention relates to a cooling device wherein means are provided to improve the oil circulating in refrigeration cycle.
• the refrigerant fluid circulating in refrigeration cycle is in superheated vapor phase while leaving the compressor.
• the refrigerant fluid leaving the compressor in superheated vapor phase transforms into liquid - vapor phase in condenser and eventually into liquid phase in the neighborhood of capillary pipe inlet.
• the fluid starts to transform into liquid - vapor phase again and reaches the evaporator in liquid - vapor phase with a low level of dryness.
• the refrigerant fluid transformed into vapor phase under the effect of the heat drawn from the environment, reaches the compressor again.
• JP2004-308925 wherein a description is given of an embodiment developed to regain the oil back to the compressor by changing the operation speed of the compressor according to the flow rate of the fluid in refrigeration cycle.
• the aim of the present invention is the realization of a cooling device wherein means are provided to effectively regain the oil accumulated inside the refrigeration cycle to the compressor.
• an oil return procedure is performed wherein the compressor is operated at a higher revolution by opening one or more than one valve, in case the compressor has been operated below a certain revolution and the specified time where a valve is to stay open decreases below a certain value or closed increases above a certain value, said valve being utilized to permit the refrigerant fluid flow to an evaporator comprised by any of the cooling compartments.
• Fig.l - is a schematic view of a cooling device.
• the cooling device (1) in accordance with the present invention comprises a compressor (4) used to pressurize the refrigerant fluid, a condenser (5) whereby the refrigerant fluid leaving the compressor (4) in superheated vapor phase is first condensed and transformed to liquid - vapor phase and then to completely liquid phase, one or more than one compartment (2) where items to be cooled are placed into and which incorporates one or more than one evaporator (6) whereby its environment is cooled as heat is absorbed by the refrigerant fluid circulating there inside, one or more than one valve (7) positioned between the condenser (5) and the evaporator (6), controlling the transfer of the refrigerant fluid to the evaporator (6) and, a control unit (3) used to control the open and closed time periods of each valve ( Figure 1).
• control unit (3) realizes the oil return procedure wherein one or more than one valve (7) is opened and the compressor (4) is started to operate at a predetermined revolution for a predetermined period of time.
• variable speed compressor In the preferred embodiment of the present invention, a variable speed compressor
• each compartment (2) is checked by the control unit (3) and according to a predetermined order, refrigeration process is performed by varying the revolution of the compressor (4) depending on the situation of each compartment where their temperature is above or below a certain temperature value. Unless the refrigeration process applied for one compartment (2) is completed, it is not possible to continue with a refrigeration process defined for other compartments (2).
• a minimum compressor (4) revolution interval is defined for each compartment (2). Oil return procedure is performed if the compressor (4) is operated below the mentioned interval.

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Mechanical Engineering (AREA)
• Thermal Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Compressor (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=37836221

Family Applications (1)

Country Status (2)

Families Citing this family (5)

Family Cites Families (9)

• 2006
  • 2006-09-05 EP EP06795916A patent/EP1922516A2/de not_active Withdrawn
  • 2006-09-05 WO PCT/IB2006/053120 patent/WO2007029180A2/en not_active Ceased

Non-Patent Citations (1)

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