EP1508008A1 - Appareil de congelation a indicateur de degivrage - Google Patents

Appareil de congelation a indicateur de degivrage

Info

Publication number
EP1508008A1
EP1508008A1 EP03737963A EP03737963A EP1508008A1 EP 1508008 A1 EP1508008 A1 EP 1508008A1 EP 03737963 A EP03737963 A EP 03737963A EP 03737963 A EP03737963 A EP 03737963A EP 1508008 A1 EP1508008 A1 EP 1508008A1
Authority
EP
European Patent Office
Prior art keywords
time
freezer
ice
measuring circuit
freezer according
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
EP03737963A
Other languages
German (de)
English (en)
Other versions
EP1508008B1 (fr
Inventor
Klaus Flinner
Georg Hausmann
Stefan Holzer
Helmut Konopa
Jörg STELZER
Fritz Hägele
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete GmbH
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 BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP1508008A1 publication Critical patent/EP1508008A1/fr
Application granted granted Critical
Publication of EP1508008B1 publication Critical patent/EP1508008B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • F25D21/02—Detecting the presence of frost or condensate
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/02—Humidity
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/11—Sensor to detect if defrost is necessary
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/11—Sensor to detect if defrost is necessary
    • F25B2700/111—Sensor to detect if defrost is necessary using an emitter and receiver, e.g. sensing by emitting light or other radiation and receiving reflection by a sensor
    • 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
    • F25D2400/08—Refrigerator tables
    • 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
    • F25D2700/02—Sensors detecting door opening
    • 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
    • F25D2700/14—Sensors measuring the temperature outside the refrigerator or freezer

Definitions

  • the present invention relates to a freezer such as a freezer, a freezer or a fridge-freezer combination.
  • Freezers of this type have an evaporator for cooling their interior, which, under normal operating conditions, has temperatures below 0 ° C. and on which, as a result, moisture condenses out of the interior. This moisture can form an ice crust during the operation of the refrigerator, which with increasing thickness affects the efficiency of the evaporator more and more.
  • no-frost devices have been developed in which the evaporator is automatically defrosted, usually time-controlled. This is possible without significant heating of the refrigerated goods because the evaporator is housed in a chamber separate from the refrigerated goods storage room of the refrigeration device and the storage room is cooled by circulating air between it and the evaporator chamber. By switching off the circulation, the heat exchange between the evaporator chamber and the storage room can temporarily be greatly reduced. It is thus possible to heat the evaporator in the chamber for defrosting without this leading to undesired heating of the refrigerated goods at the same time.
  • Static freezers are therefore generally cheaper to buy than comparable devices with no-frost automatic, and due to the absence of heating, they also seem to have better energy efficiency than the latter, so that some users prefer them over no-frost devices.
  • the object of the present invention is to provide a refrigeration device which makes it easier for the user to identify the optimum defrosting time.
  • the freezer is preferably equipped with a built-in display element which can be activated by the warning signal.
  • the display element is preferably an optical display element, since a user can ignore an optical warning signal rather than an acoustic signal for a time until he has time to defrost the device without being unduly disturbed by the signal.
  • the freezer can also be equipped with an interface for transmitting the warning signal to a data network so that the warning signal can also be displayed on a data terminal remote from the freezer.
  • the measuring circuit can comprise at least one ice sensor for detecting the presence or the layer thickness of ice on the cooling surface.
  • sensors can be based on optical principles, e.g. you can use total internal reflection properties of a transparent surface section on the cooling surface that have been changed by ice coating.
  • Acoustic measuring principles are also conceivable, e.g. the resonance frequency of a mechanical vibrator arranged on the cooling surface, which is changed by ice coating, is recorded and evaluated.
  • the measuring circuit comprises a time measuring device, and that the Defrosting is assumed to be necessary if a time measured by the time measuring device since a defined point in time has exceeded a limit value. In general, the time at which the freezer has been put into operation since its last defrosting can be assumed to be this specified time.
  • the time measured by the time measuring device can be the total operating time of the freezer since the specified point in time.
  • the time measuring device only measures the time that a door of the refrigeration device has been open since the specified point in time. This enables a more precise estimate of the amount of ice, since essentially only when the door is open can moisture be introduced into the inside of the freezer, which is deposited as ice on the cooling surface.
  • Another possibility is to use the time measuring device to measure the running time of a freezer compressor since the specified point in time.
  • the measuring circuit measures the number of door openings instead of the time the door is open and recognizes the need for defrosting if this number exceeds a limit value.
  • an operating element which can be actuated by a user to set the above-mentioned fixed point in time and means for storing the state of the measuring circuit in a de-energized state of the freezer are provided on the freezer.
  • state parameters of the measuring circuit such as the limit value, a measured time, the number of door openings or the like, can be saved over a voltage-free state of the freezer, so that a short-term power failure does not result in a reset of the measuring circuit or that detected by it Values.
  • the control element Since these storage means also store the state of the measuring circuit when the device for defrosting is switched off, the control element is required to redefine said specified point in time.
  • the measuring circuit can expediently be equipped with a sensor which detects at least one climatic condition in the vicinity of the freezer. The detection result can be used to determine the limit value as a function of it, to weight the time measured by the time measuring device with a factor dependent on the recorded climatic condition or to weight each door opening with such a factor.
  • a suitable climatic condition is the ambient temperature or humidity.
  • the measuring circuit comprises a time measuring device for measuring the running time of a compressor of the freezer and is set up to estimate the amount of ice on the basis of the ratio of the running time of the compressor to its service life or to the total operating time of the freezer.
  • FIG. 1 is a perspective view of a freezer according to the invention.
  • Figure 2 is a schematic representation of the measuring circuit and connected circuit elements of such a freezer according to a first embodiment of the invention.
  • FIG. 3, 3A and 4 flow diagrams of different configurations of working methods made with different variants of the measuring circuit
  • Fig. 2 are executable
  • FIG. 5 shows a schematic illustration of the measuring circuit and circuit elements of such a freezer connected to it according to a second embodiment of the invention
  • FIG. 6 shows a flowchart of one that can be carried out with the measuring circuit from FIG. 5
  • Fig. 8 is a schematic representation of an acoustic ice sensor.
  • the freezer shown as an example in FIG. 1 is a refrigerator with a built-in frost compartment 1.
  • An evaporator 2 forms the outer wall of the frost compartment 1, which separates it from a refrigerator compartment 3, which fills most of the interior of the refrigerator.
  • an operating panel 5 is arranged on the housing of the refrigerator, which includes various switches and / or regulators 6 for setting the function of the refrigerator and a display element 7, e.g. has an LED or LCD display.
  • Electronic circuits for controlling the operation of the refrigerator in dependence on settings made by a user on the switch 6 are accommodated behind the control panel 5.
  • These electronic circuits include a measuring circuit 8, which is shown schematically in FIG. 2.
  • the measuring circuit 8 is connected on the one hand to a switch 9 which is actuated by opening and closing the door 4.
  • a switch 9 is conventionally used in refrigeration devices for switching the
  • the measuring circuit comprises a counter 10 for
  • the measuring circuit 8 is connected to the display 7.
  • FIG. 3 A working method of this simple configuration of a measuring circuit is shown in FIG. 3.
  • step S1 of the method the measuring circuit monitors the state of the door 4; as long as the door 4 is closed, nothing happens; when the door is opened, the content n of the counter is incremented by 1 in step S2.
  • the measuring circuit compares n with one predetermined limit value N. If n ⁇ N, the method returns to step S1, if n> N, the warning signal is activated in step S5. This can be done, for example, by switching on an element of the display 7 that is specifically provided for this purpose.
  • the display 7 can also be, for example, a digital display which is used, for example, to display a temperature measured by a temperature sensor inside the refrigerator and which, in order to display the warning signal, is switched from a continuous display mode to a flashing mode.
  • step S6 If the user takes note of the warning signal and switches off the refrigerator in order to defrost it, the count value stored in the counter 10 is lost, so that the counter contains the value zero when the refrigerator is started up again (step S6).
  • FIG. 3A shows a modification of the method from FIG. 3.
  • the measuring circuit 8 expediently comprises a time measuring device such as a monostable multivibrator (monoflop).
  • a time measuring device such as a monostable multivibrator (monoflop).
  • the timing device is activated to measure a predetermined time interval and during this interval processing (S7) pauses.
  • the count value n is incremented again (S2). The count does not indicate the number of door openings since the last defrost, but a measure of the time that door 4 has been open since then.
  • steps S2, S4 the check of the door being open could be replaced by a check whether the compressor of the refrigerator is running or not.
  • the count n would be a measure of how often the compressor has been switched on since the last defrost or how long it has been running since.
  • the measuring circuit 8 is additionally connected to a sensor 11 for detecting the air humidity and / or the temperature of the air in the vicinity of the refrigerator and / or to a reset switch 12 on the control panel 5.
  • the counter 10 is non-volatile, that is to say a numerical value stored therein is retained if the supply voltage to the refrigerator is not present.
  • 4 shows an example of a working method of the measuring circuit according to this embodiment. Like that of FIG. 3, the method begins with the measurement circuit waiting in step S11 for the door 4 to be opened.
  • the measuring circuit estimates in step S12, based on the measurement results provided by the sensor 11, a moisture factor H, which should represent a measure of the amount of moisture that is entered into the refrigerator when the door is opened.
  • this moisture factor H is proportional to the absolute moisture content of the ambient air; this presupposes that both relative air humidity and temperature of the ambient air are measured with the aid of the sensor 11. If the sensor 11 measures only one of these two variables, the moisture factor determined therefrom can at most be correlated with the actual moisture input, but this is also sufficient for the purposes of the invention.
  • step S13 the count value n in the counter 10 is incremented by the moisture factor H, and then in step S14 it is checked whether the limit value N has been exceeded. If this is not the case and it is also determined after a predetermined period of time in step S 15 that the door is still open, the method returns to step S13. In this way, the counter 10 is incremented at regular intervals as long as the door is open. However, if it is determined that the door is closed, the process returns to step S11, in which the door is awaited to be opened again.
  • step S14 If the check in step S14 reveals that the limit value N has been exceeded, the warning signal is switched on (S16).
  • the content of the counter 10 is not lost when the refrigerator is switched off for defrosting, the user has to operate the reset switch 12 after defrosting when restarting in order to reset the content of the counter 10 to zero.
  • the contents of the counter 10 could of course also be set to N when the refrigerator is put back into operation or when the reset switch 12 is actuated, the incrementation in step S2 or
  • Step S13 can be replaced by a decrementation and a critical ice thickness on Evaporators that require defrosting are considered to have been reached when the counter reaches zero.
  • an input of the measuring circuit 8 is connected to an output of a thermostat circuit 13, via which the thermostat circuit 13 sends a signal for switching a compressor 14 of the refrigerator's refrigerator on or off depending on one inside the refrigerator measured temperature.
  • the length of the running phases of the compressor 14 in relation to the total operating time of the refrigerator depends on the one hand on the temperature difference maintained between the interior of the refrigerator and its surroundings, and on the other hand on the effectiveness of the evaporator 2. That is, that for maintaining a given temperature in the interior The running phases of the compressor 14 required for the refrigerator are longer, the thicker the layer of ice on the evaporator 2, which isolates it from the interior.
  • the measuring circuit 8 determines a moving average of the ratio of the duration of the running phases to the duration of the total operating time and supplies the warning signal when this ratio exceeds a predetermined limit value.
  • a sensor 11 for the ambient temperature can also be provided in this embodiment in order to enable the measuring circuit 8 to select the limit value depending on the ambient temperature and thus at least partially compensate for the dependence of the running phase duration on the temperature difference to be maintained.
  • FIG. 6 shows an example of a possible working method of the measuring circuit 8 from FIG. 5.
  • the method begins in step S21 with the initialization of the count value a in the counter 10 (which can be a real number here and a measure of the ratio the compressor running time should represent the total running time of the refrigerator) to a value below a predefined limit value A, possibly selected depending on the temperature. If it then turns out in step S22 that the compressor is switched on, the count value a is incremented by 1 in step S23 and then a multiplied by a "forgetting factor" 1- ⁇ , which is slightly less than 1. If the compressor 14 is not switched on, the process proceeds directly from S22 to S24.
  • the count value a is compared with the limit value A. If a is smaller, the warning signal remains off (S26) and the process returns to S22; if a is larger, the warning signal is turned on (S27) and the process also returns to S22.
  • the warning signal is initially only switched on towards the end of a running time phase of the compressor and goes out again in a subsequent stagnation phase. As the ice thickness increases, the time periods in which the warning signal is switched on become longer and longer until it finally remains switched on.
  • Step S26 can also be omitted, then the warning signal remains switched on permanently as soon as the count value a has exceeded the limit value A for the first time.
  • a sensor (not shown in FIG. 5) is connected to the control circuit analogously to the sensor 11 from FIG. 2, and the control circuit calculates a moisture factor H, as shown in FIG. 4, and in step S23 the count value becomes incremented by H.
  • the measuring circuit 8 is provided in order to evaluate measurement signals from one or more sensors which are arranged directly on the evaporator 2 in order to detect its ice thickness. Examples of such sensors are shown schematically in FIGS. 7 and 8.
  • the sensor 21 of FIG. 7 has a transparent body 15 with a surface 16 which is arranged on the evaporator 2 in such a way that it ices up together with it.
  • a light source 17 and a photodetector 18 are arranged behind the surface 16 such that a light beam emitted by the light source 17 and reflected on the surface 16 does not strike the photodetector 18. The reflection is strongest when the surface 16 is ice-free. If an ice layer 19 forms on the surface 16, light is diffracted into the ice layer and diffusely scattered in it. This scattered light is detected by photodetector 18; From its thickness, the thickness of the ice layer 19 can be at least approximately deduced.
  • a resonator 20 which can be electrically excited to vibrate and which is arranged on the evaporator 2 in such a way that it freezes together with the latter.
  • the resonance frequency of the resonator 20 depends on its mass and thus on the amount of ice 19 attached to it. The resonance frequency thus allows a conclusion to be drawn about the ice thickness.

Abstract

L'invention concerne un appareil de congélation comportant une surface réfrigérante sujette au givrage. Il est prévu un circuit de mesure pour évaluer la quantité de glace située sur la surface réfrigérante (2) et fournir un signal d'alarme lorsque la quantité de glace dépasse une valeur limite.
EP03737963A 2002-05-16 2003-05-14 Appareil de congelation a indicateur de degivrage Expired - Lifetime EP1508008B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10221903 2002-05-16
DE2002121903 DE10221903A1 (de) 2002-05-16 2002-05-16 Gefriergerät mit Abtauanzeige
PCT/EP2003/005081 WO2003098135A1 (fr) 2002-05-16 2003-05-14 Appareil de congelation a indicateur de degivrage

Publications (2)

Publication Number Publication Date
EP1508008A1 true EP1508008A1 (fr) 2005-02-23
EP1508008B1 EP1508008B1 (fr) 2012-07-11

Family

ID=29413899

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03737963A Expired - Lifetime EP1508008B1 (fr) 2002-05-16 2003-05-14 Appareil de congelation a indicateur de degivrage

Country Status (6)

Country Link
EP (1) EP1508008B1 (fr)
CN (1) CN100507408C (fr)
AU (1) AU2003245883A1 (fr)
BR (1) BR0310034A (fr)
DE (1) DE10221903A1 (fr)
WO (1) WO2003098135A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007066360A1 (fr) * 2005-12-06 2007-06-14 Giuseppe Floris Dispositif de detection des caracteristiques de la glace / de la neige / du givre
DE102006048880A1 (de) * 2006-10-16 2008-04-17 Wurm Gmbh & Co. Kg Elektronische Systeme Abtausteuerverfahren
CN101957116B (zh) * 2009-07-17 2014-03-26 海尔集团公司 冰箱的除霜控制方法
ES2833102T3 (es) 2010-02-23 2021-06-14 Lg Electronics Inc Refrigerador
CN104930810B (zh) * 2014-08-11 2017-05-24 国家电网公司 冰箱箱体后部内侧积冰检测报警系统
DE102016014488A1 (de) * 2016-12-06 2018-06-07 Liebherr-Hausgeräte Ochsenhausen GmbH Gefriergerät
CN107940873B (zh) * 2017-11-17 2020-12-04 合肥美的电冰箱有限公司 化霜方法、化霜系统、计算机可读存储介质和制冷设备
DE102018115866A1 (de) * 2018-06-29 2020-01-02 Liebherr-Hausgeräte Ochsenhausen GmbH Kühl- und/oder Gefriergerät

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US4074987A (en) * 1977-01-03 1978-02-21 General Electric Company Defrost sensing system for freezer compartment
US4831833A (en) * 1987-07-13 1989-05-23 Parker Hannifin Corporation Frost detection system for refrigeration apparatus
JPH0686979B2 (ja) * 1990-03-06 1994-11-02 山武ハネウエル株式会社 熱衝撃試験器の着霜予測装置
IT1255045B (it) * 1992-03-31 1995-10-17 Whirlpool Italia Metodo e dispositivo per rilevare e controllare la formazione di brina su un evaporatore di un refrigeratore
DE4318842A1 (de) * 1993-06-07 1994-12-08 York Int Gmbh Verfahren zum Abtauen einer Kälteanlage
EP0644386B1 (fr) * 1993-09-22 1998-02-25 Whirlpool Europe B.V. Procédé pour le contrÔle dynamique de la formation de givre sur un évaporateur d'une armoire frigorifique et armoire frigorifique sur laquelle ce procédé est réalisé
JP3497255B2 (ja) * 1994-11-01 2004-02-16 松下冷機株式会社 冷凍装置
DE69616026T2 (de) * 1996-04-26 2002-06-06 Robertshaw Controls Co Abtausteuerung für ein Kühlsystem, wobei die Bestimmung der Umgebungstemperatur verwendet wird
US5887443A (en) * 1997-11-20 1999-03-30 Samsung Electronics Co., Ltd. Defrost control method and apparatus of refrigerator
US6260365B1 (en) 2000-01-07 2001-07-17 Traulsen & Company, Inc. Control system and related methods for refrigeration and freezer units
AR027200A1 (es) * 2000-01-11 2003-03-19 Multibras Eletrodomesticos Sa Dispositivo indicador de formacion de hielo en aparatos de refrigeracion

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Title
See references of WO03098135A1 *

Also Published As

Publication number Publication date
AU2003245883A1 (en) 2003-12-02
CN1653308A (zh) 2005-08-10
EP1508008B1 (fr) 2012-07-11
WO2003098135A1 (fr) 2003-11-27
DE10221903A1 (de) 2003-12-04
BR0310034A (pt) 2005-02-15
CN100507408C (zh) 2009-07-01

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