EP0165220B1 - Refrigerating unit - Google Patents

Refrigerating unit Download PDF

Info

Publication number
EP0165220B1
EP0165220B1 EP19850850192 EP85850192A EP0165220B1 EP 0165220 B1 EP0165220 B1 EP 0165220B1 EP 19850850192 EP19850850192 EP 19850850192 EP 85850192 A EP85850192 A EP 85850192A EP 0165220 B1 EP0165220 B1 EP 0165220B1
Authority
EP
European Patent Office
Prior art keywords
evaporator
temperature
freezing
cooling
compressor
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.)
Expired
Application number
EP19850850192
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0165220A2 (en
EP0165220A3 (en
Inventor
Leif Gunnar Benny Andersson
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.)
Electrolux AB
Original Assignee
Electrolux AB
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 Electrolux AB filed Critical Electrolux AB
Publication of EP0165220A2 publication Critical patent/EP0165220A2/en
Publication of EP0165220A3 publication Critical patent/EP0165220A3/en
Application granted granted Critical
Publication of EP0165220B1 publication Critical patent/EP0165220B1/en
Expired legal-status Critical Current

Links

Images

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
    • F25D29/00—Arrangement or mounting of control or safety devices
    • F25D29/005—Mounting of control 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
    • F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
    • F25D11/022—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures with two or more evaporators
    • 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
    • F25B2600/2511—Evaporator distribution 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
    • F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/04—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in series

Definitions

  • the invention relates to a refrigerating unit comprising a cooling chamber with a cooling evaporator and a freezing chamber with a freezing evaporator, a first refrigerant circuit, in which the refrigerant flows in series through a compressor, the cooling evaporator and the freezing evaporator, a second refrigerant circuit, in which the refrigerant flows through the compressor, bypasses the cooling evaporator and flows through the freezing evaporator, valve means to switch off the first or the second refrigerant circuit, a first means which senses the temperature of the cooling evaporator and acts on the valve means to switch on the first refrigerant circuit at a certain higher first temperature and to switch off the first refrigerant circuit at a certain lower second temperature and a second means which senses the temperature in the freezing chamber and is arranged to start the compressor at a certain higher third temperature and to stop the compressor at a certain lower fourth temperature.
  • Such a refrigerating unit has the advantage that it is cheap to produce because only one compressor is needed to operate both the cooling chamber and the freezing chamber.
  • the means which senses the temperature of the cooling evaporator is arranged in direct thermal contact with the cooling evaporator. Said means is arranged to act on the valve means so that the circulation of refrigerant through the cooling evaporator is switched off when the temperature of the cooling evaporator goes below a certain lower temperature and to re-establish the circulation, when the temperature goes above a certain higher temperature.
  • the higher temperature is usually about +3°C so as to ensure that the evaporator shall be defrosted, and the lower temperature so low, e.g. -20°C, that a sufficient cooling effect is obtained on the goods in the cooling chamber.
  • GB-A-2,123,992 which discloses a refrigerating unit of the kind introductorily set forth, shows another solution to prevent too low temperatures from occurring in the cooling chamber. This is, however, accomplished by a further sensor sensing the air temperature in the cooling chamber. In the present refrigeration unit such a further sensor is dispensed with making the present refrigeration unit much simpler.
  • US-A-3,026,688 discloses e.g. a refrigerator where over-cooling of a freezing chamber is prevented by actuating a fan controlled by a means sensing the temperature of the inside wall of the freezing chamber.
  • the compressor of the refrigerator is controlled by a means sensing the temperature of the evaporator of a cooling chamber. Both said means are arranged partially thermally insulated from said wall and evaporator, respectively.
  • Fig. 1 shows a refrigerant circuit with one evaporator in a cooling chamber, one evaporator in a freezing chamber, a compressor to force the refrigerant through the circuit and an adjustable valve which leads the refrigerant through both evaporators
  • Fig. 2 shows the valve set so that the cooling evaporator is disconnected from the circuit
  • Fig. 3 shows how two different temperatures in the cooling chamber vary with the time at normal heat load in the freezing chamber
  • Fig. 4 shows how said temperatures vary when freezing takes place in the freezing chamber.
  • Fig. 1 10 designates a refrigerating unit with a cooling chamber 12, which shall be capable of keeping goods at a temperature of about +4°C, and a freezing chamber 14, which shall be capable of keeping goods at a temperature of about -18°C.
  • the cooling chamber 12 is refrigerated by an evaporator 16 and the freezing chamber 14 by an evaporator 18.
  • the evaporator 16 is part of a circulation circuit for a refrigerant, and the circuit is constituted by a compressor 20, a condenser 21, a valve 22, restriction means in the form of a capillary tube 24, the evaporator 16 and the evaporator 18.
  • the evaporator 18 can also be connected to a circulation circuit for refrigerant constituted by the compressor 20, the condenser 21, the valve 22, see Fig. 2, restriction means in the form of a capillary tube 25 and the evaporator 18.
  • the temperature in the freezing chamber is monitored by a means 26 which at a certain higher temperature, e.g. -15°C, gives a signal to the compressor 20 to start and at a certain lower temperature, e.g. -23°C, gives a signal to the compressor to stop.
  • a certain higher temperature e.g. -15°C
  • a certain lower temperature e.g. -23°C
  • the temperature is monitored by a means 28 which is in thermal contact with the evaporator 16 via a heat-insulating plate 30.
  • the means 28 senses a certain higher temperature, e.g. +3°C
  • the means 28 gives a signal to the valve 22 to switch over to the position shown in Fig. 1 so that refrigerant can circulate through the evaporator 16.
  • the means 28 gives a signal to the valve 22 to switch to the position shown in Fig. 2, whereby the flow of refrigerant through the evaporator 16 ceases.
  • Figs. 3 and 4 examples are shown of the influence of the insulation 30 on the temperature T in the cooling chamber as a function of the time t.
  • the compressor 20 is supposed to be running during the whole course shown in Figs. 3 and 4.
  • Fig. 3 shows the temperature course in the cooling chamber at normal operation of the freezing chamber, i.e. when freezing does not take place in it, the continuous curve 32 showing the temperature of the evaporator 16 and the broken curve 34 showing the temperature of the means 28.
  • the means 28 gives a signal to the valve 22 to admit refrigerant to the evaporator 16.
  • the evaporator 16 has a temperature of -20°C, while the temperature of the means 28 lags behind due to the insulation 30 and is higher, -15°C.
  • the means 28 gives a signal to the valve 22 to switch off the supply of refrigerant to the evaporator 16.
  • the goods in the cooling chamber which has a temperature of about +4°C, then heat the evaporator 16 and the means 28.
  • the evaporator 16 reaches 0°C and the evaporator begins to defrost.
  • the time t 4 the evaporator 16 is defrosted and the course which started at t, is repeated.
  • Fig. 4 shows the corresponding temperature course in the cooling chamber when freezing of goods takes place in the freezing chamber.
  • refrigerant is admitted through the evaporator 16.
  • the temperature in the evaporator 16 rises and it takes longer time before the means 28 reaches the lower temperature, -15°C, at which the means 28 gives a signal to switch off the circulation of the refrigerant through the evaporator 16.
  • the means 28 gives a signal to switch off the circulation of the refrigerant through the evaporator 16.
  • the temperatures of the evaporator 16 and the means 28 will follow each other better.
  • the said lower temperature has been reached.
  • the curves 32 and 34 will get substantially the same appearance as in Fig. 3. Without the insulation 30, i.e.
  • the means 28 when the means 28 according to the known technique is arranged in direct thermal contact with the evaporator 16, the temperature of the evaporator 16 would continue to fall according to the dotted line 36. Not until the time t, the means 28 would initiate switching off of the supply of refrigerant to the evaporator 16. But at the time t 7 the evaporator has taken so much heat from the goods in the cooling chamber that they have frozen, which can be prevented by the insulation 30 according to the present invention.
  • the temperature of the evaporator 16 at normal operation of the freezing chamber both in the known technique and in the invention, must be lowered to substantially the same lowest temperature, -20°C, in the example above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
EP19850850192 1984-06-13 1985-05-31 Refrigerating unit Expired EP0165220B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8403158A SE456693B (sv) 1984-06-13 1984-06-13 Anordning foer att hindra att varor fryser i en kylkammare
SE8403158 1984-06-13

Publications (3)

Publication Number Publication Date
EP0165220A2 EP0165220A2 (en) 1985-12-18
EP0165220A3 EP0165220A3 (en) 1986-07-02
EP0165220B1 true EP0165220B1 (en) 1988-07-13

Family

ID=20356213

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850850192 Expired EP0165220B1 (en) 1984-06-13 1985-05-31 Refrigerating unit

Country Status (4)

Country Link
EP (1) EP0165220B1 (da)
DE (1) DE3563792D1 (da)
DK (1) DK159893C (da)
SE (1) SE456693B (da)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0124677Y2 (da) * 1986-04-19 1989-07-26
IT1192083B (it) * 1986-05-20 1988-03-31 Zanussi Elettrodomestici Circuito frigorifero con compressore rotativo
EP0344351A1 (de) * 1988-06-03 1989-12-06 VIA Gesellschaft für Verfahrenstechnik mbH Gas-Kältemittel-Wärmetauscher, insbesondere für Drucklufttrockner
JP2000329447A (ja) 1999-05-17 2000-11-30 Matsushita Refrig Co Ltd 冷蔵庫および除霜用ヒーター
CN107543363A (zh) * 2017-08-01 2018-01-05 南京创维家用电器有限公司 一种保护电冰箱压缩机的方法、电冰箱及存储装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1072604A (fr) * 1952-01-04 1954-09-14 Gen Motors Corp Appareil frigorifique perfectionné
US3026688A (en) * 1961-01-23 1962-03-27 Gen Motors Corp Controls for two-compartment refrigerator
IT1111778B (it) * 1979-01-22 1986-01-13 Philco Italiana Macchina frigo-congelatrice a compressore unico
JPS5915782A (ja) * 1982-07-19 1984-01-26 株式会社東芝 冷蔵庫の温度制御装置

Also Published As

Publication number Publication date
DK267385A (da) 1985-12-14
SE8403158L (sv) 1985-12-14
DK159893C (da) 1991-05-21
DK267385D0 (da) 1985-06-13
EP0165220A2 (en) 1985-12-18
SE8403158D0 (sv) 1984-06-13
DK159893B (da) 1990-12-24
SE456693B (sv) 1988-10-24
EP0165220A3 (en) 1986-07-02
DE3563792D1 (en) 1988-08-18

Similar Documents

Publication Publication Date Title
KR100341234B1 (ko) 냉장고
CA1124815A (en) Household refrigerator including a vacation switch
KR0160435B1 (ko) 고효율 독립냉각 싸이클을 가지는 냉장고 및 그 제어방법
US8584478B2 (en) Refrigerator with regulable dehumidification
US4056948A (en) Presettable defrost timer
GB1480627A (en) Refrigerators
JP2001082850A (ja) 冷蔵庫
US3922874A (en) Evaporator fan delay circuit
EP0165220B1 (en) Refrigerating unit
KR100348068B1 (ko) 냉장고의 제어방법
US4530218A (en) Refrigeration apparatus defrost control
US2706894A (en) Two temperature refrigerator
US3029611A (en) Refrigerating apparatus with defrosting means
US20100064704A1 (en) Refrigerating appliance comprising an ice-making machine
KR100189100B1 (ko) 고효율 독립냉각 싸이클을 가지는 냉장고의 제어방법
JP3874941B2 (ja) 冷蔵庫
CA1204948A (en) Ice production rate selector for ice maker
US4178771A (en) Compressor refrigerator
US2333296A (en) Refrigerator
US3309888A (en) Refrigerating apparatus including defrost means
US2780924A (en) Refrigerating apparatus having automatic defrosting
US2773354A (en) Refrigerator defrost termination control system
JPS6225660Y2 (da)
EP1111317B1 (en) Refrigerator
US3118287A (en) Refrigeration system including

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB IT

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19861211

17Q First examination report despatched

Effective date: 19870709

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

REF Corresponds to:

Ref document number: 3563792

Country of ref document: DE

Date of ref document: 19880818

ET Fr: translation filed
ITF It: translation for a ep patent filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19970513

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19970522

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19970606

Year of fee payment: 13

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980531

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980531

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19980531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990302

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST