EP3611448A1 - Gekühlter schaukasten - Google Patents

Gekühlter schaukasten Download PDF

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Publication number
EP3611448A1
EP3611448A1 EP18784921.1A EP18784921A EP3611448A1 EP 3611448 A1 EP3611448 A1 EP 3611448A1 EP 18784921 A EP18784921 A EP 18784921A EP 3611448 A1 EP3611448 A1 EP 3611448A1
Authority
EP
European Patent Office
Prior art keywords
compressor
predetermined value
temperature
temperature sensor
reaches
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
EP18784921.1A
Other languages
English (en)
French (fr)
Other versions
EP3611448A4 (de
EP3611448B1 (de
Inventor
Masayuki Hamada
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.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management Co Ltd
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
Application filed by Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Publication of EP3611448A1 publication Critical patent/EP3611448A1/de
Publication of EP3611448A4 publication Critical patent/EP3611448A4/de
Application granted granted Critical
Publication of EP3611448B1 publication Critical patent/EP3611448B1/de
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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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47F—SPECIAL FURNITURE, FITTINGS, OR ACCESSORIES FOR SHOPS, STOREHOUSES, BARS, RESTAURANTS OR THE LIKE; PAYING COUNTERS
    • A47F3/00—Show cases or show cabinets
    • A47F3/04—Show cases or show cabinets air-conditioned, refrigerated
    • A47F3/0482—Details common to both closed and open types
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D29/00—Arrangement or mounting of control or safety devices
    • 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
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
    • F25D2400/28—Quick cooling
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2700/00—Means for sensing or measuring; Sensors therefor
    • F25D2700/12—Sensors measuring the inside temperature

Definitions

  • the present invention relates to a refrigerated showcase.
  • a conventional refrigerated showcase of this kind is composed of: a refrigeration circuit annularly formed by connecting, to one another through a refrigerant pipe, a compressor, a radiator, a decompression device and an evaporator; a thermally insulated storage in which a subject to be refrigerated is placed; and a device for circulating air which passes through the evaporator in the storage, air temperature in the storage is adjusted by starting and stopping the compressor, and control is performed such that the subject has the same temperature as the air temperature (see patent document 1 for example).
  • Patent Document 1 Japanese Patent Application Laid-open No. 2015-75310
  • the compressor is general to control the compressor by circulating air temperature in the storage instead of temperature of the subject to be refrigerated, and it is general to control based on a fact that circulating air temperature is equal to subject temperature without taking subject temperature into consideration.
  • Enhancement of efficiency of the compressor proceeds in recent years by an inverter for saving energy, but concerning control of the number of operational rotations of the compressor, it is only possible to control the same by circulating air temperature.
  • a difference between the circulating air temperature and the subject temperature is small in a state where the subject is sufficiently cooled, but when the subject is not cooled, the difference between the circulating air temperature and the subject temperature is large, and if the compressor is controlled based on the circulating air temperature, since the subject temperature is not involved, there is a problem that the subject is not cooled or it takes time to cool the subject.
  • the present invention has been accomplished to solve the conventional problem, and it is an object of the invention to provide a refrigerated showcase which realizes enhancement of the refrigeration effect and energy-saving operation.
  • the present invention provides a refrigerated showcase including: a refrigeration circuit annularly formed by connecting, to one another through a refrigerant pipe, a compressor, a condenser, a decompression device and an evaporator; a fan for blowing air to the evaporator and circulating the air; a temperature sensor for detecting temperature of the air; and a control device, wherein a predetermined value 1 for stopping operation of the compressor, a predetermined value 2 for starting the operation of the compressor and a predetermined value 3 for starting control of number of operational rotations of the compressor are stored in the control device, the control device stops the operation of the compressor when detected temperature of the temperature sensor reaches the predetermined value 1 during high speed operation of the compressor in which the number of operational rotations thereof is constant, and thereafter, when the detected temperature of the temperature sensor reaches the predetermined value 2, the compressor is made to execute the high speed operation and then, when the detected temperature of the temperature sensor reaches the predetermined value 3, the number of operational rotations of the compressor is
  • a first aspect of the present invention provides a refrigerated showcase including: a refrigeration circuit annularly formed by connecting, to one another through a refrigerant pipe, a compressor, a condenser, a decompression device and an evaporator; a fan for blowing air to the evaporator and circulating the air; a temperature sensor for detecting temperature of the air; and a control device, wherein a predetermined value 1 for stopping operation of the compressor, a predetermined value 2 for starting the operation of the compressor and a predetermined value 3 for starting control of number of operational rotations of the compressor are stored in the control device, the control device stops the operation of the compressor when detected temperature of the temperature sensor reaches the predetermined value 1 during high speed operation of the compressor in which the number of operational rotations thereof is constant, and thereafter, when the detected temperature of the temperature sensor reaches the predetermined value 2, the compressor is made to execute the high speed operation and then, when the detected temperature of the temperature sensor reaches the predetermined value 3, the number of operational rotations of the compressor is controlled
  • the subject can be cooled early, and energy-saving operation after cooling can be realized.
  • the control device determines whether time elapsed after the detected temperature of the temperature sensor reaches the predetermined value 1 and until the detected temperature reaches the predetermined value 2 exceeds reference time, if the elapsed time exceeds the reference time, the number of operational rotations of the compressor is controlled when the detected temperature of the temperature sensor thereafter reaches the predetermined value 3, the number of operational rotations of the compressor is stepwisely reduced, and if the elapsed time does not exceed the reference time, the high speed operation of the compressor is continued until the detected temperature of the temperature sensor thereafter reaches the predetermined value 1.
  • the fan is not stopped while the operation of the compressor is stopped.
  • the effect of the first or second aspect can further be enhanced.
  • Fig. 1 is a schematic diagram of a refrigerated showcase in the embodiment of the invention.
  • Fig. 2 is a schematic diagram of a refrigeration cycle of the refrigerated showcase.
  • the refrigeration cycle for cooling the refrigerated showcase of the embodiment is composed of a refrigeration circuit 20 formed by sequentially connecting, to one another through a refrigerant pipe, a compressor 1, a condenser 2, a decompression device 3 and an evaporator 4.
  • the evaporator 4 is placed in the refrigerated showcase 30 for cooling.
  • a fan 5 is placed near the evaporator 4. Air in the refrigerated showcase 30 is circulated by the fan 5 and cools cooling subjects 7.
  • a temperature sensor 6 is provided in an air flow path upstream of the evaporator 4 for managing temperature of the cooling subjects 7. Operation of the compressor 1 and operation of the fan 5 are determined by circulating air temperature which is detected by the temperature sensor 6.
  • the compressor 1 can be changed and controlled the number of rotations (ability) by driving an inverter, and the fan 5 can be controlled by starting and stopping using a constant speed fan.
  • the refrigeration circuit 20 is stored in a lower portion of the refrigerated showcase 30.
  • the refrigeration circuit 20 may be placed outside the refrigerated showcase 30. It is preferable that the temperature sensor 6 in the refrigerated showcase 30 is located upstream of the evaporator 4 and downstream of the cooling subjects 7, but the position of the temperature sensor 6 is not limited to this position, and the temperature sensor 6 may not be placed near the evaporator 4 only if the fan 5 can can circulates air in the refrigerated showcase 30.
  • Fig. 3 is a block diagram of a control device of the refrigerated showcase in the embodiment.
  • An electric power source, the temperature sensor 6, the fan 5 and the compressor 1 are connected to the control device 8.
  • the control device 8 has a function to determine the operations of the compressor 1 and the fan 5 based on temperature detected by the temperature sensor 6.
  • An inverter driving circuit 9 of the compressor 1 is operated by instructions of the control device 8 and in this embodiment, the control device 8 includes the inverter driving circuit 9.
  • the inverter driving circuit 9 may be provided separately from the control device 8.
  • Figs. 4 and 5 are temperature correlation diagrams between control of the number of operational rotations of the compressor and detected temperature of the temperature sensor in the embodiment, and Fig. 6 is a control flow chart in the embodiment.
  • a vertical axis shows temperature of circulating air in the refrigerated showcase 30 detected by the temperature sensor 6, temperature of the cooling subjects 7 and starting and stopping operations and variations in the number of rotations of the compressor 1, and a horizontal axis shows passage of time.
  • a predetermined value 1 is set temperature for stopping (OFF) the compressor 1
  • a predetermined value 2 is set temperature for starting up (ON) the compressor 1
  • a predetermined value 3 is set temperature for starting the control of the number of operational rotations of the compressor 1
  • a predetermined value 4 is set temperature for starting the operation of the compressor 1 to bring the number of operational rotations thereof into a low speed and constant operation
  • the set temperature of the predetermined value 4 is higher than that of the predetermined value 1
  • the set temperature of the predetermined value 3 is higher than that of the predetermined value 4
  • the set temperature of the predetermined value 2 is higher than that of the predetermined value 3.
  • the control device 8 operates the compressor 1 at high speed, preferably, at the maximum ability (maximum number of rotations) (S1).
  • operation of the fan 5 is started.
  • the control device 8 determines whether a detected value of the temperature sensor 6 reaches stop temperature (predetermined value 1) of the compressor 1 (S2).
  • the compressor 1 continues the high speed operation until the detected value of the temperature sensor 6 reaches the stop temperature (predetermined value 1) of the compressor 1. If the detected value of the temperature sensor 6 reaches the stop temperature (predetermined value 1) of the compressor 1, the control device 8 stops the compressor 1 (S3).
  • the fan 5 keeps operating without stopping.
  • the control device 8 starts measuring of a timer from the stop of the compressor 1 in S3 (S4).
  • the control device 8 again operates (ON) the compressor 1 at high speed, preferably, at the maximum ability (maximum number of rotations) (S6).
  • the control device 8 terminates the measurement of the timer by the operation of the compressor 1 in S6 (S7).
  • the control device 8 determines whether time elapsed from the start of the measurement of the timer in S4 to the end of the measurement of the timer in S7 exceeds reference time (S8).
  • control shown in Fig. 4 is performed.
  • the control device 8 determines whether the detected value of the temperature sensor 6 reaches start temperature (predetermined value 3) of reducing operation of the number of rotations of the compressor 1 (S9).
  • start temperature predetermined value 3 of reducing operation of the number of rotations of the compressor 1
  • the control is shifted to the control of the number of operational rotations of the compressor 1, i.e., inverter control, and the number of rotations is stepwisely reduced (S10).
  • the fan 5 keeps operating without stopping.
  • the compressor 1 keeps operating at high speed until the detected value of the temperature sensor 6 reaches the start temperature (predetermined value 3) of the control of the number of operational rotations of the compressor 1.
  • the control device 8 determines whether the detected value of the temperature sensor 6 reaches start temperature (predetermined value 4) of operation to bring the number of operational rotations of the compressor 1 into the low speed and constant operation (S11).
  • the control device 8 reduces the number of operational rotations of the compressor 1 stepwisely until the detected value of the temperature sensor 6 is reduced to the predetermined value 4 (S10).
  • S11 if the detected value of the temperature sensor 6 reaches the predetermined value 4, the control device 8 brings the number of operational rotations of the compressor 1 into the low speed and constant speed operation (S12).
  • the control of the number of operational rotations of the compressor 1 is not performed until the circulating air temperature (detected value of temperature sensor 6) reaches the predetermined value 1, and the circulating air temperature can be lowered in a short time by keeping the high speed operation, preferably, the maximum ability (maximum number of rotations) operation of the compressor 1.
  • the compressor 1 After the temperature of the circulating air is restored to the predetermined value 2, the compressor 1 is operated at high speed until the circulating air temperature is lowered to the predetermined value 3. After the circulating air temperature is lowered to the predetermined value 3, the control is shifted to the control of the number of operational rotations. According to this, it is possible to cool the cooling subjects 7 in a short time, and after the cooling subjects 7 are cooled, the number of the starting and stopping operations of the compressor 1 can be reduced. Therefore, energy can be saved and the cooling time can be shortened.
  • the number of rotations is controlled by protection in some cases.
  • the control of the number of operational rotations is shifted to the constant number of rotations operation when temperature becomes equal to or higher than the predetermined temperature or when the electric power source is stopped, but this shift is not limited to these cases.
  • Fig. 5 it is determined whether time elapsed after the circulating air temperature (detected value of temperature sensor 6) reaches the predetermined value 1 and until the circulating air temperature reaches the predetermined value 2 exceeds the reference time.
  • the compressor 1 is operated at high speed, and it is determined whether the circulating air temperature (detected value of temperature sensor 6) reaches the predetermined value 1 (S2).
  • constant reference time is provided within stopped time of the compressor 1, and it is determined whether the number of operational rotations of the compressor 1 is controlled in a next step by a rising width of the circulating air temperature (detected value of temperature sensor 6) within this reference time.
  • the compressor 1 is operated at high speed, preferably, the maximum ability (maximum number of rotations). Even if the circulating air temperature (detected value of temperature sensor 6) reaches the predetermined value 3, the number of operational rotations of the compressor 1 is not controlled.
  • the compressor 1 If the circulating air temperature (detected value of temperature sensor 6) exceeds the reference time and reaches the predetermined value 2, the compressor 1 is operated at high speed, preferably, the maximum ability (maximum number of rotations), and if the circulating air temperature (detected value of temperature sensor 6) reaches the predetermined value 3, the control of the compressor 1 is shifted to the number of operational rotations control thereafter.
  • the compressor 1 by operating the compressor 1 at high speed, preferably, the maximum ability (maximum number of rotations), it is possible to further shorten the cooling time of the cooling subjects 7.
  • the invention can be applied to a cooling device such as a refrigerator having an inverter compressor and a vending machine.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
EP18784921.1A 2017-04-12 2018-02-21 Gekühlter schaukasten Active EP3611448B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017078616A JP2020101294A (ja) 2017-04-12 2017-04-12 冷蔵ショーケース
PCT/JP2018/006251 WO2018190002A1 (ja) 2017-04-12 2018-02-21 冷蔵ショーケース

Publications (3)

Publication Number Publication Date
EP3611448A1 true EP3611448A1 (de) 2020-02-19
EP3611448A4 EP3611448A4 (de) 2020-04-15
EP3611448B1 EP3611448B1 (de) 2021-10-27

Family

ID=63792955

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18784921.1A Active EP3611448B1 (de) 2017-04-12 2018-02-21 Gekühlter schaukasten

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Country Link
EP (1) EP3611448B1 (de)
JP (1) JP2020101294A (de)
WO (1) WO2018190002A1 (de)

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR960002564B1 (ko) * 1992-04-30 1996-02-22 삼성전자주식회사 압축기 제어회로
JPH0735456A (ja) * 1993-07-21 1995-02-07 Matsushita Refrig Co Ltd 冷凍冷蔵庫の制御装置
JPH07282344A (ja) * 1994-04-06 1995-10-27 Kubota Corp 自動販売機の庫内温度制御装置
AU2004282449B2 (en) * 2003-10-20 2010-03-18 Hoshizaki Denki Co., Ltd. Cooling storage
CN100538220C (zh) * 2005-05-30 2009-09-09 阿塞里克股份有限公司 冷却装置及控制方法
JP2007315716A (ja) * 2006-05-27 2007-12-06 Fukushima Industries Corp 冷蔵庫
JP2008096028A (ja) * 2006-10-12 2008-04-24 Denso Corp 冷蔵庫用冷凍機
JP5686982B2 (ja) * 2010-03-29 2015-03-18 ホシザキ電機株式会社 冷却貯蔵庫
WO2011154388A2 (en) * 2010-06-08 2011-12-15 Arcelik Anonim Sirketi A cooling device with two compartments
JP5383748B2 (ja) * 2011-06-08 2014-01-08 三菱電機株式会社 ショーケース
CN102287982B (zh) * 2011-09-14 2013-11-06 合肥美的电冰箱有限公司 化霜冰箱及化霜冰箱的控制方法
JP6167430B2 (ja) * 2013-03-28 2017-07-26 パナソニックＩｐマネジメント株式会社 冷却貯蔵庫
JP6179333B2 (ja) 2013-10-10 2017-08-16 富士電機株式会社 冷却装置およびショーケース
JP6606031B2 (ja) * 2016-07-20 2019-11-13 日立グローバルライフソリューションズ株式会社 冷蔵庫

Also Published As

Publication number Publication date
EP3611448A4 (de) 2020-04-15
JP2020101294A (ja) 2020-07-02
EP3611448B1 (de) 2021-10-27
WO2018190002A1 (ja) 2018-10-18

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