WO2004088221A1 - Appareil frigorifique a degivrage automatique adaptatif et procede de degivrage dudit appareil - Google Patents

Appareil frigorifique a degivrage automatique adaptatif et procede de degivrage dudit appareil Download PDF

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Publication number
WO2004088221A1
WO2004088221A1 PCT/EP2004/003607 EP2004003607W WO2004088221A1 WO 2004088221 A1 WO2004088221 A1 WO 2004088221A1 EP 2004003607 W EP2004003607 W EP 2004003607W WO 2004088221 A1 WO2004088221 A1 WO 2004088221A1
Authority
WO
WIPO (PCT)
Prior art keywords
evaporator
air
control circuit
appliance according
refrigerating appliance
Prior art date
Application number
PCT/EP2004/003607
Other languages
German (de)
English (en)
Inventor
Ilias Manettas
Georg Strauss
Original Assignee
BSH Bosch und Siemens Hausgeräte 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 Hausgeräte GmbH filed Critical BSH Bosch und Siemens Hausgeräte GmbH
Priority to BRPI0409176-0A priority Critical patent/BRPI0409176A/pt
Priority to US10/551,339 priority patent/US20070006600A1/en
Priority to EP04725696A priority patent/EP1613905A1/fr
Publication of WO2004088221A1 publication Critical patent/WO2004088221A1/fr

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
    • F25D21/025—Detecting the presence of frost or condensate using air pressure differential detectors

Definitions

  • the present invention relates to a refrigerator with an automatically defrostable evaporator and a defrosting method therefor.
  • an evaporator which is used to cool an interior of a heat-insulating housing that can be equipped with refrigerated goods, is accommodated in a chamber which is separated from the interior and communicates with the interior via air passage openings. Together with the through openings, this chamber forms an air channel through which air is circulated in order to cool it on the evaporator and to feed it back into the interior.
  • the placement of the evaporator in the separated chamber allows the evaporator, if a critical amount of ice has formed on it, to be heated and thereby defrosted, while at the same time the air circulation between the evaporator chamber and the interior is switched off, in order to prevent that at the same time the interior of the chamber with the refrigerated goods inside is heated.
  • the evaporator is reliably defrosted as soon as a critical amount of ice on the evaporator is exceeded, because the ice isolates the evaporator from the chamber surrounding it and thus impairs the effectiveness of the cooling.
  • the housing structure of such a refrigerator generally does not allow a user to look into the evaporator chamber to check the amount of ice and to decide whether defrosting is necessary or not. Automatic defrost control is therefore required.
  • the object of the invention is to provide a refrigeration device that enables a reliable assessment of the amount of ice accumulated on an evaporator with simple and robust means, or to create a method that allows reproducible defrosting each time a given amount of ice is reached on the evaporator.
  • the invention makes use of the fact that the free cross section of the air duct in which the evaporator is arranged is limited and tends to decrease with increasing amount of ice, which is deposited on the evaporator.
  • the amount of ice and thus the need for a defrosting process can be inferred indirectly.
  • Various techniques can be used to measure the air flow through the duct. The most immediate is probably to arrange a body which can be driven to move by the air flow in the channel and to assign a sensor for detecting the movement to the body. If the air flow of the duct decreases so far that the speed falls below a predetermined limit, this means that defrosting is required.
  • an elastic element can also be provided in the air duct, which is only statically deflected by the air flow and whose deflection is detected by a sensor. A defrosting process is recognized here as necessary if the deflection of the elastic element drops below a predetermined limit value.
  • Another way to measure air flow is to use the Bernoulli effect, i.e. the fact that a lower hydrostatic pressure is measured on a flowing medium than on a standing medium.
  • a bottleneck at which particularly high flow velocities occur can be provided in the air duct, and a pressure sensor can be placed in the vicinity of this bottleneck.
  • thermal gradients influenced by the air flow in the duct This requires two temperature sensors, which are thermally differently coupled to a heat source or sink or to the air in the duct.
  • a critical decrease in the air throughput is determined here when the difference between the temperatures detected by the two sensors exceeds a limit value.
  • An electrically heated wire can be considered as a heat source for this embodiment of the invention, as is also known from air flow measuring devices in automobile construction.
  • the heating power of such a wire can be so low that it does not noticeably affect the energy balance of the refrigerator.
  • the necessary evaporator itself will be used as a heat sink.
  • a first one of the temperature sensors is preferably arranged directly on the evaporator.
  • this temperature sensor is particularly preferred to place this temperature sensor on an area of the evaporator capable of icing, so that an insulating layer of ice, which may cover the temperature sensor, further increases the temperature difference that can be measured between the two temperature sensors with increasing layer thickness.
  • the second temperature sensor is preferably arranged at an outlet of the channel.
  • Fig. 1 shows a schematic section through a refrigerator according to a first
  • FIG. 2 shows a detail of the air duct according to a second embodiment of the invention
  • FIG. 3 shows a detail of the air duct according to a third embodiment of the invention.
  • FIG. 4 shows an air flow measuring device according to a fourth embodiment of the invention.
  • Fig. 5 shows a partial section through the housing of a refrigerator according to a fifth
  • Fig. 1 shows a highly schematic of a no-frost refrigerator according to a first embodiment of the invention.
  • the refrigeration device comprises a heat-insulating housing 1, in which an interior 2 for receiving refrigerated goods and one separated from the interior 2 by an intermediate wall 3, through openings 4 in the interior Partition wall 3 with the interior 2 communicating evaporator chamber 5 is formed.
  • a plate-shaped evaporator 7 supplied with refrigerant by a refrigeration machine 6 and, in close contact with it, a defrost heater 8.
  • the evaporator chamber 5 and the openings 4 are also referred to collectively as an air duct.
  • a control circuit 10 controls the operation of the refrigerator 6 and a fan 11 attached to the upper opening 4 on the basis of a measurement signal from a temperature sensor (not shown) in the interior 2.
  • the refrigerator 6 and fan 11 can each be operated simultaneously; it is preferred to switch the fan 11 on and off with a certain delay in relation to the refrigeration machine 6, so that when the refrigeration machine 6 is started up, the evaporator 7 is only given the opportunity to cool down before air is circulated and for residual coldness of the evaporator 7 after Switching off the refrigerator 6 can still be used.
  • a wind wheel 12 is arranged in the lower opening 4, which is driven in rotation by the air flow caused by the fan 11 and whose rotation is detected by a rotary encoder 13 connected to the control circuit 10.
  • the control circuit On the basis of the signals from the rotary encoder 13, the control circuit is able to assess the rotational speed of the wind wheel 12 and thus the air throughput through the air duct. If this rotational speed drops below a predetermined limit value, this indicates that the free cross section of the evaporator chamber 5 is significantly reduced due to ice formation on the evaporator 7 and that a defrosting process is required.
  • the control circuit 10 acts on the defrost heater 8 via a switch 9 for a predetermined period of time with a heating current.
  • the time period is selected so that the amount of heat released by the defrost heater 8 during this time is sufficient to completely defrost the ice layer on the evaporator. Since the ice layer thickness at which the control circuit 10 triggers a defrosting process is always essentially the same, the thermal energy required for the defrosting is also essentially constant, and an adaptive regulation of the defrosting time period is not necessary.
  • the probability of Clamping can be reduced by briefly operating the fan 11 at a higher speed than its continuous operating speed each time it is started up, in order to ensure that the air flow occurring at the wind wheel 12 is strong enough to set it in rotation. It is also conceivable that the control circuit 10 is able to distinguish an abrupt drop in the rotational speed of the wind turbine 12 from a gradual decrease, and in the former case to operate the fan 11 briefly at an excessive speed and if no rotation is detected afterwards to generate a fault message.
  • Fig. 2 shows a section of the air duct, e.g. at one of the openings 4, according to a second embodiment of the invention.
  • a flexible lamella 14 is anchored, which projects into the channel and is deflected by an air flow from a rest position shown in dashed lines into a solid, bent position shown in solid lines.
  • the position of the slat is determined by a proximity sensor 15, e.g. in the form of an oscillating circuit with a coil 16, the resonance frequency of which is influenced by the distance of the lamella 14 from the coil 16. Since there are no constantly moving parts in this configuration, their wear is low and the reliability is high.
  • FIG. 3 shows a section of the air duct according to a third embodiment of the invention.
  • the air duct is narrowed locally to form a nozzle 17, on the outflow side of which a chamber 19 with a pressure sensor 18 is formed therein.
  • the high speed of the air flow at the outlet side of the nozzle 17 causes a strong pressure reduction in the chamber 19 in the manner of a jet pump, which pressure can be detected with the aid of the pressure sensor 18.
  • the control circuit connected to the pressure sensor 18 is thus able to estimate the flow velocity of the air and thus the throughput through the air duct and to initiate a defrosting process when the air throughput reaches a critically low value.
  • two wires 20, 21 with temperature-dependent resistance values are arranged in the air duct.
  • a measuring circuit 22 or 23 is assigned to each wire 20, 21.
  • the measuring circuit 22 applies a low measuring voltage to the wire 20, measures the resulting current flow through the wire 20 and determines the corresponding one Resistance or temperature value of the wire 20.
  • the voltage applied to the wire 20 is chosen so low that the heating of the wire 20 resulting from the current flow is negligible.
  • the first measuring circuit 22 supplies the temperature value obtained to the control circuit 10.
  • the latter supplies a temperature setpoint, which is increased by a fixed difference, to the second measuring circuit 23. This regulates the voltage with which it applies the wire 21 in such a way that the latter sets the target temperature accepts.
  • the temperature of the wire 21 is measured by the measuring circuit 23 in the same way as the measuring circuit 22 via the resistance value of the wire.
  • the measurement circuit 23 returns the value of the heating power required for this to the control circuit 10. The greater the air flow through the air duct, the greater the heating power. If it falls below a predetermined limit value, the control circuit 10 recognizes that a critical amount of ice has been reached and initiates a defrosting process.
  • FIG. 5 A fifth embodiment of the invention is shown in FIG. 5 on the basis of a partial section of a refrigerator housing.
  • the structure of the housing essentially corresponds to that described with reference to FIG. 1, so that elements identified by the same reference symbols in both figures are not described again.
  • the wind turbine and the rotary encoder in the lower opening 4 of the air duct are omitted; instead, a temperature sensor 24 or 25 is attached in the upper opening, which forms the outlet of the air duct, and on the plate of the evaporator 7.
  • a hatched area denotes an ice layer 26 which can form around the evaporator and the defrost heater 8.
  • the free passage cross section of the evaporator chamber 5 is relatively large, and an air throughput required for effective cooling of the interior 2 can be achieved at a low flow speed and accordingly a long residence time of the air in contact with the evaporator 7.
  • the cooling of the air on the evaporator 7 is therefore intensive, and the difference between the temperatures detected by the sensors 24, 25 is small.
  • the free cross section of the evaporator chamber 5 decreases.
  • the air throughput also decreases and the flow velocity in the evaporator chamber 5 increases. As a result, shortened the time available for cooling the air increases, and the difference between the temperatures detected by the sensors 24, 25 increases.
  • the temperature sensor 25 is attached to a point on the evaporator 7 where ice can collect, then the ice layer 26 itself also contributes to increasing the temperature difference between the two sensors. If this temperature difference exceeds a predetermined limit value, the control circuit 10 connected to the sensors 24, 25 triggers a defrosting process.

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)

Abstract

L'invention concerne un appareil frigorifique présentant une carcasse thermoisolante (1) enfermant un compartiment intérieur (2), un évaporateur (7) placé dans un canal d'air (4, 5) communiquant avec le compartiment intérieur (2), un dispositif chauffant (8) destiné à chauffer l'évaporateur (7) ainsi qu'un circuit de commande (10) prévu pour commander le fonctionnement du dispositif chauffant (8). Ce circuit de commande (10) est relié à un dispositif de mesure (12, 13) placé sur le canal d'air (4, 5), lequel dispositif est prévu pour fournir un signal de mesure représentatif du débit d'air à travers le canal (4, 5), et ledit circuit est conçu pour mettre en service le dispositif chauffant (8) afin de permettre le dégivrage de l'évaporateur (7), lorsque le débit d'air enregistré tombe en dessous d'une valeur seuil.
PCT/EP2004/003607 2003-04-04 2004-04-05 Appareil frigorifique a degivrage automatique adaptatif et procede de degivrage dudit appareil WO2004088221A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BRPI0409176-0A BRPI0409176A (pt) 2003-04-04 2004-04-05 refrigerador com degelo automático adaptado e processo de degelo para o mesmo
US10/551,339 US20070006600A1 (en) 2003-04-04 2004-04-05 Refrigeration device with adaptive automatic defrosting and corresponding defrosting method
EP04725696A EP1613905A1 (fr) 2003-04-04 2004-04-05 Appareil frigorifique a degivrage automatique adaptatif et procede de degivrage dudit appareil

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10315523.6 2003-04-04
DE10315523A DE10315523A1 (de) 2003-04-04 2003-04-04 Kältegerät mit adaptiver Abtauautomatik und Abtauverfahren dafür

Publications (1)

Publication Number Publication Date
WO2004088221A1 true WO2004088221A1 (fr) 2004-10-14

Family

ID=32981063

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2004/003607 WO2004088221A1 (fr) 2003-04-04 2004-04-05 Appareil frigorifique a degivrage automatique adaptatif et procede de degivrage dudit appareil

Country Status (7)

Country Link
US (1) US20070006600A1 (fr)
EP (1) EP1613905A1 (fr)
CN (1) CN1798947A (fr)
BR (1) BRPI0409176A (fr)
DE (1) DE10315523A1 (fr)
RU (1) RU2380627C2 (fr)
WO (1) WO2004088221A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3540342A4 (fr) * 2016-11-10 2020-07-15 LG Electronics Inc. -1- Réfrigérateur et procédé de commande de réfrigérateur

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WO2008109927A1 (fr) * 2007-03-09 2008-09-18 Kearns Stuart Christopher Jame Système de commande de réfrigération
DE102011053906A1 (de) * 2011-09-23 2013-03-28 Visteon Global Technologies, Inc. Luftentfeuchtungseinheit und -verfahren
EP3390931B1 (fr) * 2015-12-18 2019-11-13 Carrier Corporation Procédés et systèmes de vérification que le flux d'air est approprié dans un réceptacle
WO2017131426A1 (fr) * 2016-01-29 2017-08-03 엘지전자 주식회사 Réfrigérateur
KR102627972B1 (ko) * 2018-02-23 2024-01-23 엘지전자 주식회사 냉장고
DE102018202971A1 (de) * 2018-02-28 2019-08-29 BSH Hausgeräte GmbH Kältegerät mit Abtauheizung
KR102614564B1 (ko) * 2018-03-08 2023-12-18 엘지전자 주식회사 냉장고 및 그 제어방법
CN111609635A (zh) * 2019-02-26 2020-09-01 青岛海尔股份有限公司 风冷冰箱及其除霜控制方法
IT202000005218A1 (it) * 2020-03-11 2021-09-11 Lu Ve Spa Procedimento perfezionato di controllo della formazione della brina nelle unita’ di raffreddamento degli impianti di refrigerazione

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EP0676603A2 (fr) * 1994-04-11 1995-10-11 Control and Regulation Circuits Meitav Ltd. Système de commande de dégivrage

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Publication number Priority date Publication date Assignee Title
US3062019A (en) * 1960-12-09 1962-11-06 Whirlpool Co Defrost control apparatus
DE1401478A1 (de) * 1962-03-16 1968-10-24 Nakolaus Bakos Windfahnenabtaurelais
US3726104A (en) * 1971-02-12 1973-04-10 Thermo King Corp Refrigeration system defrost initiation apparatus
FR2459949A1 (fr) * 1979-06-26 1981-01-16 Stiebel Eltron Gmbh & Co Kg Dispositif de commande pour le degivreur d'une installation frigorifique
GB2133867A (en) * 1983-01-21 1984-08-01 Newtech Controls Ltd Defrost control means
EP0563724A1 (fr) * 1992-03-30 1993-10-06 Whirlpool Europe B.V. Procédé et dispositif pour l'évaluation de la formation de givre sur un évaporateur de réfrigération, en particulier du type à circulation forcée d'air
EP0676603A2 (fr) * 1994-04-11 1995-10-11 Control and Regulation Circuits Meitav Ltd. Système de commande de dégivrage

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3540342A4 (fr) * 2016-11-10 2020-07-15 LG Electronics Inc. -1- Réfrigérateur et procédé de commande de réfrigérateur
US11143452B2 (en) 2016-11-10 2021-10-12 Lg Electronics Inc. Refrigerator and method for controlling refrigerator

Also Published As

Publication number Publication date
EP1613905A1 (fr) 2006-01-11
CN1798947A (zh) 2006-07-05
DE10315523A1 (de) 2004-10-14
RU2380627C2 (ru) 2010-01-27
BRPI0409176A (pt) 2006-04-11
US20070006600A1 (en) 2007-01-11
RU2005130294A (ru) 2006-06-27

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