EP0376389A1 - Kälteerzeuger mit einem Fühler für den Ablauf des Abtauvorgangs - Google Patents
Kälteerzeuger mit einem Fühler für den Ablauf des Abtauvorgangs Download PDFInfo
- Publication number
- EP0376389A1 EP0376389A1 EP89203266A EP89203266A EP0376389A1 EP 0376389 A1 EP0376389 A1 EP 0376389A1 EP 89203266 A EP89203266 A EP 89203266A EP 89203266 A EP89203266 A EP 89203266A EP 0376389 A1 EP0376389 A1 EP 0376389A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- defrosting
- siphon
- water
- branch
- flip
- 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
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
- 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
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- 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 refrigerator or freezer type cold generator provided with a device for defrosting the cold parts which transforms the ice into water to be evacuated.
- 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.
- this defrosting is carried out with a heating resistor placed in contact with the evaporator. Regularly, thanks to a clock, this resistance is supplied (generally 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 using a measurement of electrical resistance between two electrodes as described in the document FR 2 609 789.
- these measurements are erratic and do not allow reliable operation to correctly determine the end of defrosting.
- the cold generator comprises an end-of-defrost sensor comprising: . a reservoir which receives the water to be discharged, into which one of the branches of a siphon plunges in order to empty the reservoir when the water reaches the level required to initiate the siphon, the other branch being outside the reservoir, . an optical barrier, comprising a light emitter and a light receiver, arranged around the other branch of the siphon so that the light beam of the optical barrier is interrupted by the passage of water in said other branch when defrosting is in progress, . and an electrical circuit, which processes the electrical signal delivered by the optical barrier, detecting the end of defrosting when the light beam is no longer interrupted for a predetermined period in order to deactivate the defrosting member.
- 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 of the optical barrier activates each time the siphon is primed a monostable which in turn activates one of the inputs of a 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 defrost end 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 indicated in FIG. 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 power 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)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8817494 | 1988-12-30 | ||
FR8817494A FR2641368B1 (fr) | 1988-12-30 | 1988-12-30 | Generateur de froid muni d'un capteur de fin de degivrage |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0376389A1 true EP0376389A1 (de) | 1990-07-04 |
EP0376389B1 EP0376389B1 (de) | 1993-07-28 |
Family
ID=9373631
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89203266A Expired - Lifetime EP0376389B1 (de) | 1988-12-30 | 1989-12-20 | Kälteerzeuger mit einem Fühler für den Ablauf des Abtauvorgangs |
Country Status (5)
Country | Link |
---|---|
US (1) | US4995244A (de) |
EP (1) | EP0376389B1 (de) |
JP (1) | JPH0293683U (de) |
DE (1) | DE68907877T2 (de) |
FR (1) | FR2641368B1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007031452A1 (de) * | 2005-09-12 | 2007-03-22 | BSH Bosch und Siemens Hausgeräte GmbH | Kältegerät und tauwasserverdunster dafür |
Families Citing this family (6)
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 |
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 |
Citations (6)
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 |
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 |
FR2427563A1 (fr) * | 1978-05-30 | 1979-12-28 | Gen Electric | Appareil de commande de degivrage pour systeme de conditionnement de la temperature |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
GB1546071A (en) * | 1976-06-04 | 1979-05-16 | Pierce M | Icemaking machine |
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 |
-
1988
- 1988-12-30 FR FR8817494A patent/FR2641368B1/fr not_active Expired - Lifetime
-
1989
- 1989-12-05 US US07/446,504 patent/US4995244A/en not_active Expired - Fee Related
- 1989-12-20 DE DE89203266T patent/DE68907877T2/de not_active Expired - Fee Related
- 1989-12-20 EP EP89203266A patent/EP0376389B1/de not_active Expired - Lifetime
- 1989-12-28 JP JP1989150265U patent/JPH0293683U/ja active Pending
Patent Citations (6)
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 |
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 |
FR2427563A1 (fr) * | 1978-05-30 | 1979-12-28 | Gen Electric | Appareil de commande de degivrage pour systeme de conditionnement de la temperature |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007031452A1 (de) * | 2005-09-12 | 2007-03-22 | BSH Bosch und Siemens Hausgeräte GmbH | Kältegerät und tauwasserverdunster dafür |
Also Published As
Publication number | Publication date |
---|---|
DE68907877D1 (de) | 1993-09-02 |
DE68907877T2 (de) | 1994-01-13 |
FR2641368A1 (fr) | 1990-07-06 |
JPH0293683U (de) | 1990-07-25 |
US4995244A (en) | 1991-02-26 |
FR2641368B1 (fr) | 1991-03-15 |
EP0376389B1 (de) | 1993-07-28 |
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