Classifications

• • G—PHYSICS
  • G05—CONTROLLING; REGULATING
  • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
  • G05D23/00—Control of temperature
  • G05D23/19—Control of temperature characterised by the use of electric means
• • G—PHYSICS
  • G05—CONTROLLING; REGULATING
  • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
  • G05D23/00—Control of temperature
  • G05D23/19—Control of temperature characterised by the use of electric means
  • G05D23/1927—Control of temperature characterised by the use of electric means using a plurality of sensors
  • G05D23/193—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces
  • G05D23/1931—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces to control the temperature of one space
• • 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
• • 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
  • F25B41/30—Expansion means; Dispositions thereof
  • F25B41/31—Expansion valves
  • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
• • 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
  • F25B2600/21—Refrigerant outlet evaporator temperature
• • 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

• the present invention relates to a method for controlling the temperature of a refrigerating device or a heat pump device, and in particular, to prevent liquid from flowing to a compressor and stabilize even when a sudden load change occurs in an evaporator.
• the present invention relates to a temperature control method capable of controlling the temperature of a cooled part by using the temperature control method.
• the temperature control method as prior art of the present invention is disclosed in Japanese Utility Model Application No. 54-94232 (Japanese Utility Model Application Laid-Open No. 56-1276) filed by the same applicant.
• the temperature control method disclosed herein is based on the temperature detector and the pressure detector attached to the outlet side of the cooler arranged in the refrigeration cycle, that is, the suction pipe.
• the degree of superheat calculated based on the measured temperature and pressure is automatically measured depending on the temperature detector installed at the part to be cooled.
• the temperature of the portion to be cooled is kept constant by adjusting the opening of the refrigerant flow control valve.
• Fig. I is a flow chart of a refrigeration system using such a conventional control method.
• the symbol ⁇ indicates a refrigerant gas compressor, and the refrigerant gas discharged from the compressor ⁇ is liquefied in the condenser 2.
• the liquefied refrigerant is ⁇ Stored in receiver 3.
• This refrigerant liquid is reduced in pressure by a flow control valve 4 operated by electric or pneumatic oil pressure or the like] 9 and flows into the cooler 15 as a low-temperature low-pressure liquid.
• heat is blown from the air in the refrigerator, for example, the refrigerator, and the refrigerant liquid is gasified and returned to the compressor ⁇ through the suction pipe 12.
• the temperature detector 9 and the temperature controller 10 installed in the refrigerator operate so as to specify the set value of the superheat of the superheat controller 6.
• the superheat controller 6 calculates the superheat of the suction gas based on the temperature and pressure measured by the temperature detector 7 and the pressure detector 8 attached to the suction pipe 12,
• the flow rate regulating valve 4 regulates the amount of refrigerant supplied to the cleaner 5 so that the calculated degree of superheat becomes equal to the set degree of superheat.
• the temperature controller 10 sends a command signal to the superheat controller 6 to increase the superheat setting value!
• the flow control valve 4 operates so as to reduce the amount of refrigerant supplied to the cooler 15 so as to increase the degree of superheat of the suction gas.
• the cooling capacity of the refrigerator decreases, and the temperature in the refrigerator becomes equal to the set value.
• a command signal is sent from the temperature controller 10 to the superheat controller 6 to reduce the set value of the superheat.
• the flow control valve 4 operates in the reverse of the above-described case, and operates so that the temperature in the refrigerator decreases and becomes equal to the set value.
• the number of coolers for a single compressor is small, so fluctuations in the class due to external factors can be absorbed by controlling the capacity of the compressor.
• the compartments in the hold are divided into a large number, so the number of coolers is large, and the The change in the pressure of the refrigerant gas at the outlet side (the larger the number of coolers, the larger the change in pressure as a whole) is to be absorbed by controlling the capacity of the compressor. It is impossible.
• the purpose of the present invention is to change the load suddenly in the evaporator.
• Another object of the present invention is to provide a temperature control method capable of stably controlling the temperature of the portion to be cooled even when A occurs. Even if the load fluctuates suddenly, the liquid of the ⁇ medium to the compressor is the same!
• the purpose of the present invention is to provide a temperature control method capable of preventing the above.
• the temperature control method for a refrigerating apparatus is based on a second control signal formed based on the temperature of a portion to be cooled, and a degree of superheat calculated from a temperature and a pressure on an evaporator outlet side. And comparing the second control signal formed as described above with the smaller control signal and selectively outputting the smaller control signal as a control signal for adjusting the valve opening of the refrigerant flow control valve.
• the temperature control method of the present invention compares the superheat calculated from the temperature at the evaporator outlet side and the pressure with a predetermined set superheat, and sets the calculated actual superheat.
• the second control signal is set so that the second control signal becomes smaller when the temperature becomes lower than the superheat degree.
• the opening of the flow control valve is adjusted by the i-th control signal formed based on the temperature of the cooled part to keep the temperature of the cooled part constant.
• the valve opening is adjusted by the second control signal that is formed, so that it is possible to prevent liquid from flowing into the compressor. It has such features.
• Fig. 1 is a flow chart showing the conventional temperature control method
• Figs. 2 and 3 are flow chart diagrams showing the temperature control method of the refrigeration system of the present invention. is there.
• reference numeral 20 indicates one refrigeration cycle.
• the refrigerant gas discharged from the compressor 21 is guided to the capacitor 22, where it is liquefied and stored in the receiver 23.
• This refrigerant liquid flows to the flow control valve 24!
• the pressure is reduced and flows into cooler 25.
• heat is blown from the air in the chilled rhinoceros, for example, the chilled rhinoceros, and the refrigerant liquid is gasified and returned to the compressor 21 via the suction pipe 32.
• the flow control valve 24 is configured so as to be properly opened and closed by an electric motor drive, a servo motor drive, and a pneumatic drive. The flow control valve and the pressure reducing action are performed. It is also used for two purposes.
• the temperature detector 26 and the temperature controller 27 installed in the refrigerator or near the evaporator outlet output an output signal Mi for controlling the internal temperature or the evaporator outlet temperature to a constant value.
• Temperature detector 28 mounted on the hand suction pipe 32, the pressure detector 29 Contact good beauty superheat adjusting meter 30 the output signal M 2 for adjusting a constant degree of superheat of the suction gas.
• the output signals Mi and M? Are the smaller outputs of the minimum value selection circuit 40. The signal is selected, and the output signal is used to control the opening of the flow rate control valve 24 and to operate the valve 24 electrically and accurately.
• the output signal Mi is small, and the flow control valve 24 is controlled by the signal to control the opening degree, thereby keeping the temperature of the portion to be cooled constant, and suddenly changing the load. If one of the cooler fans in the cooler breaks down and the air does not flow to the cooler, the refrigerant will not evaporate and the superheat will decrease. set superheat follows because 3 ⁇ 4 Ru smaller by connexion flow rate output signal M 2 of
• the output signal Mi is separated from the other output signal Mi, and the smaller output signal is transmitted to the flow control valve 24. If the pressure fluctuates and the internal temperature is disturbed, increase the output signal M 2 to the output signal Mi 9 and increase the output signal M 2 to the flow control valve 24. J? Control of the temperature inside the refrigerator
• an expansion valve can be used in place of the flow control valve 24) of the above-described embodiment.
• a combination of a flow s ⁇ valve and an expansion valve is used. You can do that too.
• the flow control valve 24 is mainly used for adjusting the flow rate and for reducing the pressure in the front-to-rear mounting relationship with the expansion valve. The operation can be performed by the expansion valve 34.
• the above embodiment is an example in which the present invention is applied to a refrigerating apparatus, and the temperature control method of the present invention can be applied to a heat pump apparatus.

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Mechanical Engineering (AREA)
• Thermal Sciences (AREA)
• General Engineering & Computer Science (AREA)
• General Physics & Mathematics (AREA)
• Automation & Control Theory (AREA)
• Remote Sensing (AREA)
• Devices That Are Associated With Refrigeration Equipment (AREA)
• Control Of Positive-Displacement Pumps (AREA)
• Cooling Or The Like Of Electrical Apparatus (AREA)
• Compression-Type Refrigeration Machines With Reversible Cycles (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=13161488

Family Applications (1)

Country Status (3)

Cited By (4)

Families Citing this family (4)

Citations (1)

• 1983
  • 1983-04-07 JP JP58061106A patent/JPS59185948A/ja active Granted
• 1984
  • 1984-04-05 WO PCT/JP1984/000170 patent/WO1984003933A1/ja unknown
  • 1984-04-07 KR KR1019840001847A patent/KR920010738B1/ko not_active Expired

Patent Citations (1)

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