EP1332325B1 - Appareil frigorifique a degivrage automatique - Google Patents

Appareil frigorifique a degivrage automatique Download PDF

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Publication number
EP1332325B1
EP1332325B1 EP01982413A EP01982413A EP1332325B1 EP 1332325 B1 EP1332325 B1 EP 1332325B1 EP 01982413 A EP01982413 A EP 01982413A EP 01982413 A EP01982413 A EP 01982413A EP 1332325 B1 EP1332325 B1 EP 1332325B1
Authority
EP
European Patent Office
Prior art keywords
sensor
temperature
evaporator
temperatures
lim
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
EP01982413A
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German (de)
English (en)
Other versions
EP1332325A1 (fr
Inventor
Hans-Georg Reisinger
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 EP1332325A1 publication Critical patent/EP1332325A1/fr
Application granted granted Critical
Publication of EP1332325B1 publication Critical patent/EP1332325B1/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
    • F25D21/002—Defroster control
    • 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
    • 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
    • F25D2400/34—Temperature balancing 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
    • F25D2700/00—Means for sensing or measuring; Sensors therefor
    • F25D2700/10—Sensors measuring the temperature of the evaporator
    • 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
    • F25D2700/12—Sensors measuring the inside temperature
    • 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 refrigerator according to the preamble of claim 1.
  • Such refrigerators also referred to as a no-frost refrigeration appliance, are e.g. used as household refrigerators or freezers.
  • the evaporators of such refrigerators are equipped with heaters, which are operated from time to time to heat the evaporator to a temperature above 0 ° C and thus to bring Reif to melt, which is reflected in the course of operation on the evaporator and its Cooling performance impaired.
  • the operating time of the refrigerator is measured to control the automatic defrost, and a defrost is initiated when a predetermined period of time has elapsed.
  • a purely on the operating time oriented control can of course not take into account different conditions of use of a refrigerator.
  • the amount of rime that accumulates in a given time in a household refrigerator can vary greatly, depending on how often and how long the door of the refrigerator is opened and how high the moisture content of the case entering the refrigerator outside air.
  • a temperature-dependent automatic defrost control is also used. So it is e.g. It is known to measure the evaporation temperature and the air temperature at the evaporator inlet or outlet of an air-flowed evaporator and to initiate a defrosting process whenever the difference between these two temperatures exceeds an initial value measured immediately after a defrosting operation by a predetermined percentage.
  • Object of the present invention is to provide a refrigeration device with defrosting automatic, which maintains a favorable time interval of defrosting even with changes in the outside temperature or set by a user target temperature of the refrigerator.
  • the control circuit can be implemented in a simple manner with a memory which receives values of the limit value for different pairs of outdoor and cold room temperature.
  • the control circuit may further comprise an interpolation unit for calculating the threshold for pairs of temperatures measured by the first and third sensor based on the values recorded in the memory.
  • the limits are preferably selected for all pairs of outdoor and refrigerator temperature, that they correspond to a predetermined frost layer thickness on the evaporator. These values can be measured, for example, on a prototype of the refrigeration appliance under standardized conditions of use, and the limit values thus obtained are stored in the control devices of the refrigeration appliances supplied by the manufacturer.
  • control device it is also conceivable to design the control device in such a way that it is able to change these limit values.
  • the controller is capable of measuring the time required by the heater to defrost the evaporator, and thus inferring the amount of frost or film thickness actually present on the evaporator.
  • the control means changes the threshold values of the second sensor so that the time required for the downtime converges to the set value. That is, if the defrost lasts too long, the limit of the temperature difference is lowered, if it does not last long enough, it will be increased.
  • a refrigerator according to the invention acquires a set of limit values of the second temperature sensor in the course of its operation which is adapted in an absolutely flexible manner to the specific operating conditions of the refrigeration appliance.
  • FIG. 1 shows a highly schematic representation of a refrigeration device with an insulating housing 1, which encloses a cooling space 2. From a refrigerant circuit of the refrigerator, an evaporator 3 in the interior of the refrigerator and a compressor 4 are shown in the figure, which supplies the evaporator 3 with liquefied refrigerant and evacuated vaporized refrigerant therefrom.
  • a first sensor 5 is in the refrigerator for detecting of its temperature Ti arranged.
  • a second temperature sensor 6 is located on the evaporator 3 in the vicinity of the refrigerant inlet to measure the evaporation temperature T v of the refrigerant.
  • a third sensor 7 for measuring the outside temperature T e is arranged outside the housing 1. All three sensors are connected to a control device, here a microprocessor 8.
  • the microprocessor 8 controls the operation of the compressor 4 on the basis of the temperature T i measured by the first sensor 5 and controls the operation of a heating element 9 arranged on the evaporator 3 on the basis of the temperatures measured by all three sensors 5, 6, 7 and a set of limit values stored in another microprocessor 8 memory 10 is stored.
  • a first step S1 the microprocessor 8 detects the temperatures T i of the interior measured by the sensors 5, 6, 7, T e of the surroundings and T v of the evaporator.
  • step S2 it determines a threshold T lim of the evaporator temperature associated with the measured values of T i , T e .
  • This determination may be made, for example, by storing the microprocessor 8 among the pairs of indoor and outdoor temperature to which a threshold in the memory 10 which is closest to the measured pair of indoor and outdoor temperature and whose threshold value is taken as the associated threshold. It is also conceivable to round the measured temperature values in each case to the next higher or next lower temperature value to which a limit value is present in the memory 10.
  • the microprocessor 8 for a pair (T i , T e ) of measured indoor and outdoor temperatures those four pairs (T i- , T e- ), (T i- , T e + ), (T i + , T e- ) and (T i + , T e + ) determined, for the T i- (T e- ) each to T i (T e ) next smaller and T i + (T e + ) of the to T i (T e ) next larger temperature value to which a limit is stored in the memory 10, and that the microprocessor the limit for (T i , T e ) by interpolation of the limits to (T i- , T e- ), (T i- , T e + ), (T i + , T e- ) and (T i + , T e + ).
  • step S3 the found limit value T lim is compared with the evaporator temperature T v . If the evaporator temperature is higher than the threshold, it is concluded that defrosting is not yet necessary, and the process returns to the beginning. If the evaporator temperature T v is lower than the threshold, it is considered that a frost layer has formed on the evaporator, which must be defrosted. As a result, the microprocessor 8 sets a timer to 0 in step S4 and starts energizing the heater 9 to defrost the evaporator 3.
  • step S5 the duration t is compared with a first limit value. If the duration t is greater than this limit lim1, the limit read from the memory 10 in step S2 is reduced in step S7. All other limits in memory remain unchanged. If t is smaller than the setpoint value lim1, a comparison of the time duration t with a smaller setpoint valuelim2 follows in step S8. If the time duration t falls below this setpoint value, the limit value T lim determined in step S 2 is increased in the memory 8 in step S 9.
  • T lim remains unchanged.
  • the reduction or increase of T lim in steps S7 and S9 can be done by subtracting or adding a fixed, small positive value or by subtracting or adding a value proportional to the difference between t and the set value lim1 or lim2. Also a reduction or enlargement by multiplying or dividing with a predetermined fixed or proportional to the factor factor comes into consideration.
  • a limit value T lim for the evaporator temperature which is exactly one predetermined set thickness of a frost layer, is obtained over time for each use condition of the refrigerator defined by a pair (from an outside temperature T e and an interior or refrigerator temperature T i ) on the evaporator 3 corresponds.
  • Changes in the conditions of use whether by fluctuations in the outside temperature T e or because a user sets a different refrigerator temperature T i between two defrosts, can no longer lead to disturbances in the rhythm of the defrosting operations, since for all combinations of these temperatures the appropriate evaporator temperature limit T v is stored as a limit in the memory 10.
  • the defrost control is thus completely time-independent.

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)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Claims (7)

  1. Appareil frigorifique comprenant une chambre de refroidissement (2), un évaporateur (3) pour un réfrigérant, disposé avec la chambre de refroidissement (2), un premier capteur (5) pour saisir une température (Ti) de la chambre de refroidissement (2), un deuxième capteur (6) pour saisir une température (Tv) du réfrigérant, un troisième capteur (7) pour saisir une température extérieure (Te), un dispositif de chauffage (9) pour l'évaporateur (3) et un dispositif de commande (8) pour le fonctionnement du dispositif de chauffage (9) en fonction des températures (Ti, Tv, Te) mesurées par le premier capteur (5), le deuxième capteur (6) et le troisième capteur (7), ce dispositif de commande étant conçu de manière à activer le dispositif de chauffage (9) lorsque la température (Tv) mesurée par le deuxième capteur (6) passe en dessous d'une valeur limite (Tlim),
    caractérisé en ce que l'appareil frigorifique est conçu de telle manière que la valeur limite (Tlim) est déterminée en fonction des températures (Ti, Te) mesurées par le premier capteur (5) et le troisième capteur (7).
  2. Appareil frigorifique selon la revendication 1, caractérisé en ce que le dispositif de commande (8) comprend une mémoire (10) qui enregistre des valeurs de la valeur limite (Tlim) pour différentes paires de température extérieure et température de la chambre de refroidissement.
  3. Appareil frigorifique selon la revendication 2, caractérisé en ce que le dispositif de commande (8) comprend une unité d'interpolation pour calculer la valeur limite pour des paires de températures (Ti, Te), mesurées par le premier capteur (5) et le troisième capteur (7), à l'aide des valeurs enregistrées dans la mémoire (10).
  4. Appareil frigorifique selon l'une quelconque des revendications précédentes, caractérisé en ce que les valeurs limites (Tlim) pour toutes les paires de température extérieure et température intérieure (Ti, Te) sont sélectionnées de telle manière qu'elles correspondent à une épaisseur de givre prédéfinie sur l'évaporateur (3).
  5. Appareil frigorifique selon l'une quelconque des revendications 1 à 4, caractérisé en ce que les valeurs limites (Tlim) du deuxième capteur de température (6) sont modifiables au moyen du dispositif de commande (8).
  6. Appareil frigorifique selon la revendication 5, caractérisé en ce que le dispositif de commande (8) est en mesure de mesurer le temps (t) nécessaire par le dispositif de chauffage (9) pour dégivrer l'évaporateur (3) et en ce que, lorsque ce temps est différent d'une valeur de consigne (lim1, lim2), il est en mesure de modifier les valeurs limites (Tlim) du deuxième capteur (6) de telle manière que le temps (t) nécessaire pour le dégivrage converge vers la valeur de consigne.
  7. Appareil frigorifique selon la revendication 6, caractérisé en ce que, lorsqu'en cas d'une paire prédéfinie de température extérieure et température de la chambre de refroidissement (Ti, Te), le temps (t) nécessaire au dégivrage est différent de la valeur de consigne (lim1, lim2), le dispositif de commande (8) modifie les valeurs limites des paires de températures voisines de la paire définie plus fortement que celles des paires de températures plus éloignées.
EP01982413A 2000-10-27 2001-10-09 Appareil frigorifique a degivrage automatique Expired - Lifetime EP1332325B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10053422 2000-10-27
DE10053422A DE10053422A1 (de) 2000-10-27 2000-10-27 Kältegerät mit Abtau-Automatik
PCT/EP2001/011660 WO2002035165A1 (fr) 2000-10-27 2001-10-09 Appareil frigorifique a degivrage automatique

Publications (2)

Publication Number Publication Date
EP1332325A1 EP1332325A1 (fr) 2003-08-06
EP1332325B1 true EP1332325B1 (fr) 2006-06-07

Family

ID=7661346

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01982413A Expired - Lifetime EP1332325B1 (fr) 2000-10-27 2001-10-09 Appareil frigorifique a degivrage automatique

Country Status (7)

Country Link
EP (1) EP1332325B1 (fr)
CN (1) CN1471622B (fr)
AT (1) ATE329217T1 (fr)
BR (1) BR0114956A (fr)
DE (2) DE10053422A1 (fr)
ES (1) ES2266279T3 (fr)
WO (1) WO2002035165A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022037880A1 (fr) * 2020-08-17 2022-02-24 BSH Hausgeräte GmbH Procédé pour dégivrer un évaporateur d'un appareil de froid

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10315524A1 (de) * 2003-04-04 2004-10-14 BSH Bosch und Siemens Hausgeräte GmbH Kältegerät und Betriebsverfahren dafür
DE102006048880A1 (de) * 2006-10-16 2008-04-17 Wurm Gmbh & Co. Kg Elektronische Systeme Abtausteuerverfahren
DE102007011114A1 (de) 2007-03-07 2008-09-11 BSH Bosch und Siemens Hausgeräte GmbH Kältegerät
DE202011110325U1 (de) * 2011-09-23 2013-08-13 Visteon Global Technologies, Inc. Luftentfeuchtungseinheit
EP2719978B1 (fr) * 2012-10-15 2015-06-17 Whirlpool Corporation Procédé de commande d'un appareil frigorifique domestique
DE102012221295A1 (de) * 2012-11-21 2014-05-22 BSH Bosch und Siemens Hausgeräte GmbH Kältegerät mit einem Kühlfach
CN108759257A (zh) * 2018-07-12 2018-11-06 长虹美菱股份有限公司 一种风冷冰箱间室内自循环化霜规则
CN111322812A (zh) * 2018-12-17 2020-06-23 青岛海尔生物医疗股份有限公司 风冷冰箱智能进入化霜的控制方法、控制装置及冰箱
CN112114602B (zh) * 2019-06-20 2022-04-22 中科赛凌(中山)科技有限公司 一种控温方法和系统

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Publication number Priority date Publication date Assignee Title
DE2629595A1 (de) * 1976-07-01 1978-01-05 Licentia Gmbh Verfahren und vorrichtung zum abtauen des verdampfers bei einem kuehlgeraet mit abtauvorrichtung
DE2711602A1 (de) * 1977-03-17 1978-09-21 Bosch Gmbh Robert Abtauvorrichtung
US4251988A (en) 1978-12-08 1981-02-24 Amf Incorporated Defrosting system using actual defrosting time as a controlling parameter
GB2133867B (en) * 1983-01-21 1986-06-11 Newtech Controls Ltd Defrost control means
DE3333907A1 (de) * 1983-09-20 1985-04-04 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8000 München Verfahren und vorrichtung zur abtauregelung von waermepumpen
US4884414A (en) * 1987-08-26 1989-12-05 Paragon Electric Company, Inc. Adaptive defrost system
JP3033260B2 (ja) * 1991-07-25 2000-04-17 株式会社デンソー 冷凍装置の除霜制御装置
WO2000026590A1 (fr) * 1998-10-31 2000-05-11 Daewoo Electronics Co., Ltd. Procede de commande de degivrage pour un refrigerateur

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022037880A1 (fr) * 2020-08-17 2022-02-24 BSH Hausgeräte GmbH Procédé pour dégivrer un évaporateur d'un appareil de froid

Also Published As

Publication number Publication date
CN1471622A (zh) 2004-01-28
CN1471622B (zh) 2010-05-26
DE10053422A1 (de) 2002-05-08
ES2266279T3 (es) 2007-03-01
WO2002035165A1 (fr) 2002-05-02
BR0114956A (pt) 2003-11-04
EP1332325A1 (fr) 2003-08-06
ATE329217T1 (de) 2006-06-15
DE50110072D1 (de) 2006-07-20

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