EP0376389B1 - Générateur de froid muni d'un capteur de fin de dégivrage - Google Patents

Générateur de froid muni d'un capteur de fin de dégivrage Download PDF

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Publication number
EP0376389B1
EP0376389B1 EP89203266A EP89203266A EP0376389B1 EP 0376389 B1 EP0376389 B1 EP 0376389B1 EP 89203266 A EP89203266 A EP 89203266A EP 89203266 A EP89203266 A EP 89203266A EP 0376389 B1 EP0376389 B1 EP 0376389B1
Authority
EP
European Patent Office
Prior art keywords
defrosting
siphon
water
monostable
reservoir
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 - Lifetime
Application number
EP89203266A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0376389A1 (fr
Inventor
Michel Steers
Jean-Pierre Hazan
Gilles Delmas
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.)
Whirlpool France SAS
Whirlpool Europe BV
Original Assignee
Whirlpool France SAS
Whirlpool Europe BV
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 Whirlpool France SAS, Whirlpool Europe BV filed Critical Whirlpool France SAS
Publication of EP0376389A1 publication Critical patent/EP0376389A1/fr
Application granted granted Critical
Publication of EP0376389B1 publication Critical patent/EP0376389B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F25D21/14—Collecting or removing condensed and defrost water; Drip trays
    • 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
    • F25D2321/00—Details or arrangements for defrosting; Preventing frosting; Removing condensed or defrost water, not provided for in other groups of this subclass
    • F25D2321/14—Collecting condense or defrost water; Removing condense or defrost water
    • F25D2321/141—Removal by evaporation
    • F25D2321/1411—Removal by evaporation using compressor heat
    • 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
    • F25D2321/00—Details or arrangements for defrosting; Preventing frosting; Removing condensed or defrost water, not provided for in other groups of this subclass
    • F25D2321/14—Collecting condense or defrost water; Removing condense or defrost water
    • F25D2321/145—Collecting condense or defrost water; Removing condense or defrost water characterised by multiple collecting pans
    • 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
    • F25D2321/00—Details or arrangements for defrosting; Preventing frosting; Removing condensed or defrost water, not provided for in other groups of this subclass
    • F25D2321/14—Collecting condense or defrost water; Removing condense or defrost water
    • F25D2321/146—Collecting condense or defrost water; Removing condense or defrost water characterised by the pipes or pipe connections

Definitions

  • the invention relates to a cold generator of the refrigerator or freezer type provided with a member for defrosting the cold parts which transforms the ice into water to be drained, and a tank which receives the water to be drained, in which one of the branches of a siphon to empty the tank when the water reaches the level required to prime the siphon, the other branch being outside the tank.
  • Ventilated cold refrigerators / freezers have the advantage of no frost in the cooling compartments. This frost, however, is deposited in the coldest place of the freezer, that is to say on the fins of the evaporator. If the freezer or refrigerator doors are opened often, the amount of frost on the evaporator is such that it clogs the fins, thereby reducing cooling efficiency and preventing air circulation. It is therefore necessary to defrost this evaporator periodically.
  • a cold generator of the type described in the first paragraph is known from document US-A-2 250 945. It relates to a refrigeration system provided with means for automatically defrosting the cooling element. During periods of generator shutdown, the cooling element heats up, allowing the frost to turn into water, which is collected in a container placed on the evaporator. This container is connected by a conduit to a small tank fitted with a siphon which starts and discharges the defrost water to a control chamber.
  • this defrosting is carried out with a heating resistor placed in contact with the evaporator. Regularly, thanks to a clock, this resistance is powered (usually 1/2 hour every 8 hours). In order to avoid an excessive rise in temperature in the freezing compartment, it is necessary not to supply this heater for too long and to disconnect it as soon as the defrosting is finished.
  • the problem is therefore to determine the end of defrosting time in order to stop the defrosting operation.
  • One solution may consist in detecting the flow of water in the evacuation duct for example by means of a measurement of electrical resistance between two electrodes as described in the document FR-A-2 609 789
  • these measurements are erratic and do not allow reliable operation making it possible to correctly determine the end of defrosting.
  • the ice When the cold generator is defrosted, the ice turns into water. It is evacuated by a pipe at the back of the refrigerator and accumulates in a main tank placed above the refrigeration unit. The heat released by the group evaporates the evacuated water.
  • the end of defrost sensor can be placed between this drain pipe and the main tank.
  • the sensor tank is connected to the main tank via the siphon. During the defrosting operation, the water will flow into the sensor tank and as soon as the level is sufficient to prime the siphon, the water will suddenly flow into the main tank until the siphon is defused.
  • the defrosting operation is therefore characterized by a succession of filling and emptying of the sensor tank. This succession is detected at the level of the optical barrier by a signal which activates a monostable which remains in this state for a time slightly greater than the time separating two emptying of the sensor tank. The pulse corresponding to the second drain is used to reset the monostable for an equivalent time.
  • the RS flip-flop is activated on its other input by a signal which can come from a clock if defrosting operations are programmed in advance. It can also come from a frost sensor which detects that a defrosting operation must be carried out.
  • the electrical signal from the optical barrier activates each time the siphon is primed a monostable which in turn activates one of the inputs of an RS flip-flop so that the output of the RS flip-flop implements the defrosting operation, the active period T2 of the monostable being greater than the relaxation period T1 of the siphon, the flip-flop RS being deactivated when the monostable is itself deactivated, the start of the end of defrost sensor operating by activating the other input of the flip-flop RS at l using either a clock or an external signal.
  • FIG. 1 represents a diagram of a cold generator 10 comprising a tank 11 in which a compressor 12 delivers cold to an evaporator 13.
  • the defrosting of the evaporator can be carried out using a heating resistor 33.
  • the sensor 20 Under the evaporator 13 is placed the sensor 20 according to the invention intended to receive the water due to the defrosting operation. It is shown in Figure 2. It includes a siphon 21, one branch 23 plunges into a small tank 24 of the sensor and the other branch 22 dips into the main tank 25 which is intended to receive the defrost water from the generator cold.
  • the small reservoir of the sensor 24 receives its water from the evaporator via the conduit 26.
  • an optical barrier comprising a light emitter 27 (for example a light emitting diode) and a light receiver 28 (for example a phototransistor).
  • a light emitter 27 for example a light emitting diode
  • a light receiver 28 for example a phototransistor
  • the detector receives a light flux.
  • the light flow is interrupted.
  • the interruptions of the luminous flux will be spaced by a period T1 ( Figure 3).
  • the start of the signal it detects is used to reset a monostable 30.
  • This has a natural period T2 which is greater than the period T1 as shown in Figure 3.
  • the output of the monostable acts on an input R of a flip-flop RS 31 and activates the output of flip-flop 31 so that it activates the supply 32 of the resistor 33 which is used to heat the evaporator and to ensure defrosting.
  • the resistor 33 is supplied.
  • the monostable T2 is no longer reset and switches to deactivate the supply of the resistor 33.
  • the defrosting cycle is finished.
  • a device 34 which can be a programmed clock which imposes regular cycles or by a frost sensor which by measuring the he thickness of the frost detects that a defrosting operation is to be undertaken.
  • the end of defrost sensor according to the invention can be used in a fridge or freezer or any machine intended to produce cold requiring defrosting operations.

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)
  • Defrosting Systems (AREA)
  • Removal Of Water From Condensation And Defrosting (AREA)
EP89203266A 1988-12-30 1989-12-20 Générateur de froid muni d'un capteur de fin de dégivrage Expired - Lifetime EP0376389B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8817494A FR2641368B1 (fr) 1988-12-30 1988-12-30 Generateur de froid muni d'un capteur de fin de degivrage
FR8817494 1988-12-30

Publications (2)

Publication Number Publication Date
EP0376389A1 EP0376389A1 (fr) 1990-07-04
EP0376389B1 true EP0376389B1 (fr) 1993-07-28

Family

ID=9373631

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89203266A Expired - Lifetime EP0376389B1 (fr) 1988-12-30 1989-12-20 Générateur de froid muni d'un capteur de fin de dégivrage

Country Status (5)

Country Link
US (1) US4995244A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
EP (1) EP0376389B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPH0293683U (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE68907877T2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2641368B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0522980A3 (en) * 1991-06-17 1993-04-14 Eastman Kodak Company Method and apparatus for thermally printing large images with small dye-donor patches
US5699677A (en) * 1996-11-07 1997-12-23 White Consolidated Industries, Inc. Compressor mounted drain pan utilizing polyurethane adhesive
US6321555B1 (en) * 1999-02-25 2001-11-27 I.R.C.A. S.P.A Industria Resistenze Defrosting device, in particular for refrigeration systems
AR027200A1 (es) * 2000-01-11 2003-03-19 Multibras Eletrodomesticos Sa Dispositivo indicador de formacion de hielo en aparatos de refrigeracion
DE102005043355A1 (de) * 2005-09-12 2007-03-15 BSH Bosch und Siemens Hausgeräte GmbH Kältegerät und Tauwasserverdunster dafür
DE102011113477A1 (de) * 2011-05-03 2012-11-08 Liebherr-Hausgeräte Ochsenhausen GmbH Kühl- und/oder Gefriergerät
US10398076B1 (en) * 2018-03-23 2019-09-03 Cnh Industrial Canada, Ltd. Method and system for preventing plugging of an agricultural particulate material

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2250945A (en) * 1938-10-21 1941-07-29 Hoover Co Refrigeration
US2525342A (en) * 1947-12-23 1950-10-10 Kramer Trenton Co Means for evacuating drip water from evaporating units of refrigerating equipment
US2886954A (en) * 1956-07-25 1959-05-19 Joseph R Batteiger Ice making apparatus
US3065608A (en) * 1957-03-01 1962-11-27 Carrier Corp Defrost control
US3280577A (en) * 1963-11-20 1966-10-25 Matsushita Electric Ind Co Ltd Automatic defrosting control device
FR1517089A (fr) * 1967-02-03 1968-03-15 Martin Usines Fonderie Arthur Perfectionnements aux dispositifs de dégivrage pour armoires frigorifiques
FR2253191A1 (en) * 1973-11-29 1975-06-27 Pierce Martin Safety switch for ice making machine - immersion electrode stops ice formation when ice slurry reduces flow
GB1546071A (en) * 1976-06-04 1979-05-16 Pierce M Icemaking machine
US4215554A (en) * 1978-05-30 1980-08-05 General Electric Company Frost control system
US4570639A (en) * 1982-12-30 1986-02-18 Memorial Hospital For Cancer And Allied Diseases Discontinuity detector
US4631529A (en) * 1984-10-17 1986-12-23 Ivek Corporation Electro-optical fluid detector
FR2609789B1 (fr) * 1987-01-15 1989-05-12 Cappa Robert Procede et dispositif pour la surveillance du bon fonctionnement d'une installation de production du froid

Also Published As

Publication number Publication date
FR2641368A1 (fr) 1990-07-06
DE68907877T2 (de) 1994-01-13
JPH0293683U (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1990-07-25
US4995244A (en) 1991-02-26
EP0376389A1 (fr) 1990-07-04
FR2641368B1 (fr) 1991-03-15
DE68907877D1 (de) 1993-09-02

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