EP0017633B1 - Method of defrosting a freezing chamber and arrangement for carrying out the method - Google Patents

Method of defrosting a freezing chamber and arrangement for carrying out the method Download PDF

Info

Publication number
EP0017633B1
EP0017633B1 EP19800850026 EP80850026A EP0017633B1 EP 0017633 B1 EP0017633 B1 EP 0017633B1 EP 19800850026 EP19800850026 EP 19800850026 EP 80850026 A EP80850026 A EP 80850026A EP 0017633 B1 EP0017633 B1 EP 0017633B1
Authority
EP
European Patent Office
Prior art keywords
water
vessel
defrosting
collecting means
cabinet
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
EP19800850026
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0017633A1 (en
Inventor
Johan Bergseth
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 EP0017633A1 publication Critical patent/EP0017633A1/en
Application granted granted Critical
Publication of EP0017633B1 publication Critical patent/EP0017633B1/en
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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/06—Removing frost

Definitions

  • This invention relates to a method of defrosting a freezing chamber in a freezer, preferably in a freezer cabinet, wherein the freezing chamber is emptied and the door closed, and steam is used for heat transfer to frosted parts and surfaces in the chamber.
  • the invention also relates to an arrangement for carrying out the method.
  • a defrosting device for use in a refrigerator is known.
  • the device comprises a water container with a heating element for converting the water to steam.
  • the device is bulky. It is movable and intended to be inserted with water in it into the refrigerator chamber when defrosting is desired.
  • An object of this invention is to provide a method of defrosting which considerably reduces the time required for the process and at the same time makes it possible in a better way than previously to collect the water formed during defrosting.
  • the method according to the invention is generally characterized by the steps defined in the characterizing part of the following claim 1.
  • An arrangement for carrying out the method is characterized by the features defined in the characterizing part of claim 5.
  • Fig. 1 is a front view of the cabinet without door
  • Fig. 2 is a vertical cross section of the same cabinet (however, with its door) on the line II-II of Fig. 1
  • Fig. 3 is a top view of a vessel placed in the cabinet
  • Fig. 4 is a vertical cross section of the vessel on the line IV-IV of Fig. 3. 1
  • Figs. 1 and 2 show a freezer cabinet 10 operated by a compressor 11 and having cooled shelves 12, 13, 14 and a cooling element 15 inside the freezing chamber 17 under the top wall 16 of the cabinet.
  • the cabinet has a door 18, which however is not shown in Fig. 1.
  • a shallow vessel 19 is placed under a shelf 13.
  • the vessel is shown to an enlarged scale in Figs. 3 and 4 and will be described below.
  • a drain conduit 21 whose upper opening is covered by a removable plug, not shown, preventing air from flowing through the conduit when the cabinet is in operation.
  • Under the door the cabinet has a vent louvre 22 to an air channel, through which cooling air is supplied to the compressor 11 and to a condensor 23 at the rear side of the cabinet.
  • a heating element 24 in the form of an electric heating coil is heat-conductively connected to the bottom of the vessel and is fed with current through wires 25, 26 from a control means 27, which as shown in Fig. 1 can be placed under the door 18. This means may be placed in the freezing chamber or somewhere else together with control means for the normal operation of the freezer.
  • the means 27 is fed with current through wires 28 from an electric mains and includes a switch with two contacts 29, 30, one contact 30 being disposed on an arm 31 arranged to snap between two positions. The arm is shown in Fig. 3 with the switch in its off-position. The switch can be caused to close the circuit by depressing a push button 32.
  • the control means 27 also includes a thermostat 34 which disconnects the switch.
  • the thermostat 34 has a sensor 35 in heat- conductive contact with the vessel 19 and an impulse conduit 36 therefrom to the control means 27.
  • vapour When vapour is being formed the temperature of the vessel is abt. 100°C nearest the element and lower at a distance from it.
  • the temperature of the vessel increases rapidly which is used for interruption of the defrosting by the thermost, whose sensor reacts on a temperature which is above the operation temperature in the point in which the sensor is placed.
  • the heating element 24 capable of vaporizing water in the vessel 19 the latter is designed so that not more than a given maximum quantity of water can be collected in the vessel. For this reason holes 37 with flanged edges are made in the bottom of the vessel in the shown embodiment.
  • Defrosting of the above described freezer cabinet is carried out in the following manner.
  • the refrigerating apparatus of the freezer is disconnected and the cabinet is emptied of items. These are placed outside the cabinet and are shrouded by some insulation or in some other manner protected against temperature increase during the defrosting.
  • the plug in the drain conduit 21 in the bottom 20 of the cabinet is removed and a water collecting vessel 38 is placed under the opening of the drain conduit.
  • the cabinet door is closed and the electric current to the heating element 24 is switched in by depressing the push button 32.
  • the heat supply to the vessel 19 results in the first hand in that ice and frost on the nearest shelf 13 above the vessel 19 melt so that water drops into the warm vessel 19 and is vapourized.
  • the vapour thus formed goes to the coldest places in the chamber, i.e., those covered by ice.
  • the vapour condenses and causes a substantial supply of heat to the desired places.
  • the holes 37 are meant to prevent large quantities of water from collecting at the heating element 24 thereby obstructing or delaying the desired effective vapourization.
  • the bottom surface should be formed so as to conduct the water flowing down to this drain. It can be suitable to make the front edge and also the upwardly nearest cabinet edge with a slightly marked border which leads the water towards the bottom or prevents water from flowing towards the opening of the cabinet.
  • a smaller water drain can also be placed like a screen on the inside of the door in its lower part to prevent water possibly condensed on the door from flowing straight down to the sealing strip of the door without passing over the bottom of the cabinet.

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)
  • Removal Of Water From Condensation And Defrosting (AREA)
  • Defrosting Systems (AREA)
EP19800850026 1979-03-20 1980-03-04 Method of defrosting a freezing chamber and arrangement for carrying out the method Expired EP0017633B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE7902497 1979-03-20
SE7902497A SE427775B (sv) 1979-03-20 1979-03-20 Sett och anordning for att avfrosta en fryskammare

Publications (2)

Publication Number Publication Date
EP0017633A1 EP0017633A1 (en) 1980-10-15
EP0017633B1 true EP0017633B1 (en) 1984-01-25

Family

ID=20337598

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800850026 Expired EP0017633B1 (en) 1979-03-20 1980-03-04 Method of defrosting a freezing chamber and arrangement for carrying out the method

Country Status (5)

Country Link
EP (1) EP0017633B1 (sv)
AU (1) AU533466B2 (sv)
DE (1) DE3066231D1 (sv)
ES (1) ES8200468A1 (sv)
SE (1) SE427775B (sv)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1245929B (it) * 1990-11-22 1994-11-05 Giannino Chinello Procedimento per sbrinare frigoriferi e congelatori e dispositivo per effettuare il procedimento

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2090413A (en) * 1936-04-25 1937-08-17 Gen Motors Corp Refrigerating apparatus
US2466479A (en) * 1946-12-07 1949-04-05 Charles J Roach Defrosting appliance
US2553657A (en) * 1947-03-06 1951-05-22 Francis L La Porte Refrigerator defrosting method and apparatus
US2647375A (en) * 1950-05-13 1953-08-04 Philco Corp Two-temperature refrigerator with automatic defrosting
US2718765A (en) * 1952-08-02 1955-09-27 Avco Mfg Corp Defroster-heater and baffle installation for refrigerator
US2751197A (en) * 1953-01-05 1956-06-19 Gen Electric Refrigerator humidifier
US2780925A (en) * 1955-11-21 1957-02-12 Gen Electric Refrigerating apparatus having automatic defrost
US2959936A (en) * 1958-04-01 1960-11-15 Gen Motors Corp Refrigerating apparatus
GB866624A (en) * 1959-02-02 1961-04-26 Searle Mfg Company Ltd Improvements in drip trays for refrigeration apparatus
US2994209A (en) * 1959-02-26 1961-08-01 Gen Motors Corp Frostless refrigerator
US3033967A (en) * 1959-11-23 1962-05-08 Robert W Hird Defrosting device
FR2244146A1 (en) * 1973-09-14 1975-04-11 Duchamp James Distilled water recovery or prepn in refrigerators - using heat supplied by motor or moist, warm air when door is open

Also Published As

Publication number Publication date
SE427775B (sv) 1983-05-02
SE7902497L (sv) 1980-09-21
AU533466B2 (en) 1983-11-24
AU5657980A (en) 1980-09-25
EP0017633A1 (en) 1980-10-15
ES489670A0 (es) 1981-10-16
ES8200468A1 (es) 1981-10-16
DE3066231D1 (en) 1984-03-01

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