EP2769156B1 - Kältegerät mit verdunstungsschale und heizeinrichtung zur verdunstungsförderung - Google Patents

Kältegerät mit verdunstungsschale und heizeinrichtung zur verdunstungsförderung Download PDF

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Publication number
EP2769156B1
EP2769156B1 EP12780140.5A EP12780140A EP2769156B1 EP 2769156 B1 EP2769156 B1 EP 2769156B1 EP 12780140 A EP12780140 A EP 12780140A EP 2769156 B1 EP2769156 B1 EP 2769156B1
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EP
European Patent Office
Prior art keywords
refrigeration appliance
zone
overflow
appliance according
water
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.)
Active
Application number
EP12780140.5A
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German (de)
English (en)
French (fr)
Other versions
EP2769156A2 (de
Inventor
Roland Bender
Adolf Feinauer
Wolfgang FLICKINGER
Hans Ihle
Peter LIENHART
Achim Paulduro
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Publication of EP2769156A2 publication Critical patent/EP2769156A2/de
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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
    • F25D2321/1413—Removal by evaporation using heat from electric elements or using an electric field for enhancing removal

Definitions

  • the present invention relates to a refrigeration appliance, in particular a domestic refrigeration appliance such as a refrigerator or freezer, with an evaporation tray for evaporating condensate derived from a storage chamber of the device and a heater which is operable to, if necessary, the evaporation of condensate in the evaporation tray promote.
  • a refrigeration appliance in particular a domestic refrigeration appliance such as a refrigerator or freezer, with an evaporation tray for evaporating condensate derived from a storage chamber of the device and a heater which is operable to, if necessary, the evaporation of condensate in the evaporation tray promote.
  • the condensation which is reflected in the storage chamber, gets there as part of the stored therein refrigerated goods and in the form of water vapor, which is contained in the entering each time the door of the refrigerator in the storage chamber ambient air.
  • the extent of water entry into the storage chamber, and thus the rate at which it flows out of the storage chamber of the evaporation tray, is difficult to estimate because of numerous factors such as the type of product and its packaging, temperature and percentage humidity of the ambient air and the amount the air exchanged at a door opening between environment and storage chamber depends air, and various of these sizes are barely measurable with reasonable effort.
  • the construction of the refrigeration unit must ensure that the condensate in the evaporation tray evaporates quickly enough to reliably prevent overflow, which could damage the refrigeration unit and its surroundings.
  • a refrigeration device has become known according to the preamble of claim 1, in which a arranged on the evaporation tray temperature sensor is used to gain information about the water level. If, during the defrosting of this conventional refrigeration appliance, condensate enters the evaporating dish in large quantities, a heating device is started in order to evaporate the resulting water, and the resulting heating is monitored. The more water in the shell, the slower the warming.
  • a disadvantage of this known refrigeration device is that the accuracy with which the heating rate can infer the amount of water in the evaporation tray is the worse, the fuller it is. That just when the need to accurately estimate the water level is greatest, the accuracy of the estimate is worst.
  • Object of the present invention is therefore to provide a refrigeration device that allows a reliable assessment of the residual capacity of an evaporation arrangement even at high water levels.
  • the object is achieved by providing a refrigeration device, in particular a domestic refrigeration appliance, with at least one storage chamber, a heat source, an evaporation arrangement for evaporating condensate derived from the storage chamber, a temperature sensor arranged in thermal contact with the heat source at the evaporation arrangement, one with the temperature sensor connected control unit and a heater which is operable by the control unit to increase the evaporation rate of the evaporation arrangement, and which is adapted to decide on the basis of a change of the temperature detected by the temperature sensor on operation or non-operation of the heater, the evaporation arrangement a main zone and a Flood zone includes, the Temperature sensor is disposed in the flooding zone and the flooding zone contains water in contact with the temperature sensor only if the water level in the main zone has reached or exceeded an overflow level.
  • the overflow zone is dry, and the heating of the temperature sensor by heat emitted by the heat source is independent of the water level in the main zone. Only when the water penetrates into the flooding zone, the rate of change of the temperature detected by the temperature sensor changes inversely proportional to the amount of water in the flooding zone.
  • the overflow level By appropriately setting the overflow level, therefore, a water level just below an upper edge of the evaporation arrangement can be securely detected, regardless of the amount of water contained in the main zone. Since the amount of water in the flooding zone is only a small part of the total content of the evaporation arrangement, a low heat output of the heat source and / or a short measurement time is sufficient to detect a temperature change that allows a reliable conclusion about the amount of water.
  • As a heat source can serve the same heater, which is also used after estimating the amount of water to heat the water.
  • the waste heat of a compressor can be used to detect the resulting temperature change.
  • the main zone has an overflow edge at the level of the overflow level through which water, when it reaches overflow level, can drain into the flooding zone located below the main zone.
  • the main zone and the flood zone can form two separate bodies of water at different levels. In this way, since the free water surfaces of the main and the flooding zones can overlap one another in plan view, it is possible to accommodate a large free water surface at which evaporation can take place in a small space.
  • the flooding zone as a whole is above the overflow level, in particular a bottom of the flooding zone should be flat or sloping towards the main zone to allow complete emptying of the flooding zone when the water level in the main zone falls below the overflow level.
  • the main zone and the flooding zone may be separated by a barrier which, while not preventing the exchange of water between them, hinders the falsification of the temperature measurement by drainage of warm water from the flooding zone.
  • the heater comprises a arranged in the overflow zone heating element.
  • the barrier from the heater can prevent heated water from draining into the main zone, so that, given the heater power, a rapid temperature rise is achieved.
  • a arranged in the main zone second heating element serves to heat if necessary, the water of the main zone quickly and thus to promote its evaporation.
  • the second heating element may be omitted if there is another heat source, such as the compressor, which can supply enough heat to the main zone.
  • the temperature sensor is identical to the heating element.
  • Such a temperature sensor may in particular be based on the evaluation of the temperature-dependent ohmic resistance of the heating element.
  • FIG. 1 shown domestic refrigerator, here a refrigerator, in the usual way a heat-insulating housing with a body 1 and a lying outside the cutting plane of the figure door, which together define a storage chamber 3.
  • the storage chamber 3 is here cooled by a coldwall evaporator 4 arranged on its rear wall between an inner container of the body 1 and an insulating foam layer surrounding it, but it should be immediately obvious to the person skilled in the art that the special features of the invention explained below also apply in connection with FIG any other types of evaporator, in particular a Nofrost evaporator, are applicable. Also conceivable is the application to a Nofrost freezer, since this, at least in a defrosting phase of the evaporator, also discharges condensation.
  • a collecting channel 7 extends at the foot of the rear wall of the storage chamber 3, which is cooled by the evaporator 4 and collects condensed water which deposits on the region of the inner container cooled by the evaporator 4 and flows downwards.
  • a pipeline 8 leads from the lowest point of the gutter 7 through the insulating foam layer to an evaporation assembly 9, which is mounted in a machine room 5 on a housing of a compressor 6 to be heated by waste heat of the compressor 6.
  • a corresponding pipeline could emanate from the bottom of a chamber receiving the evaporator.
  • the evaporation arrangement 9, which in Fig. 2 additionally shown in plan view, comprises a arranged in direct, close contact with the housing of the compressor 6 circular shell 16, the lowest point 17 extends annularly around the housing 5 of the compressor 6. From an upper side wall portion of the shell 16 is from a shallow shell 18, whose here substantially horizontal bottom 19 is significantly higher than the lowest point 17 of the shell 16. As long as the water does not rise above the bottom 19, the shell 18 is dry. The shell 16 therefore forms a main zone of the evaporation arrangement 9, which almost always contains water, while the shell 18 forms a flooding zone filled only at high water levels. Since the bottom 19 has no local lowest point separate from the shell 16, the water from the shell 18 flows completely into the deeper shell 16 when the water level in the evaporation arrangement falls below the level of the bottom 19.
  • the heating element 10 serves on the one hand to monitor the water level in the evaporation arrangement 9 and on the other hand, if necessary, to accelerate the evaporation.
  • the heating element 10 is controlled by an electronic control unit 13, which is shown here for the sake of simplicity in the engine room 5, but in practice largely arbitrarily on the refrigerator and in particular adjacent to a - can be arranged - not shown here - control panel.
  • the control unit 13 is connected to a temperature sensor 15 which is adjacent to the shell 18 to the heating element 10th is mounted and with thermal water in the shell 18, if any, in thermal contact.
  • the heating element 10 and the temperature sensor 15 are shown as separate components; However, it is also conceivable and expedient to simultaneously use a heating element 10 with temperature-dependent ohmic resistance as a temperature sensor 15.
  • the heating element 10 does not come into contact with the water and the temperature detected by the sensor 15 when the control unit 13 starts to operate the heating element 10 increases extremely rapidly in a short time as indicated by the curve A in FIG Fig. 3 clarified.
  • the course of the curve A is independent of the actual water level. If, however, the water level is so high that the water penetrates into the flat shell 18, then the heating element 10 is flushed over, and the higher the temperature of the water in the shell 18, the slower the temperature rise, for example, as indicated by curve C of FIG Fig. 3 shown. It can therefore a limit rate of change of the temperature, eg according to the curve B of Fig.
  • control unit 13 determines that there is no risk of overflow, and after measuring the rate of increase, the heater 10 turns off again, whereas if the rate of increase is below the threshold is located, an overflow hazard is detected and the heating element 10 remains for a long time at high power in operation to reduce the water level in the evaporation assembly 9 noticeably.
  • the control unit 13 operates the heating element 10 only for measuring the rate of increase of the temperature, if not at the same time appreciably heat from the compressor 6 flows to the evaporation tray, i. while the compressor is running and in a given period thereafter, no measurement of the slew rate takes place.
  • the refrigeration device is a NoFrost device
  • condensate enters the evaporation tray 9 every time the evaporator is defrosted. This causes the temperature to rise the water in the evaporation tray 9 fall significantly below that of the surrounding engine room 5, and heating of the water takes place without action of the heater 10 by temperature compensation with the surrounding engine room. Also this temperature compensation can falsify a measurement of the water level. Therefore, in a NoFrost refrigeration unit, the control unit 13 is set up, a water level measurement, which is pending at a time to be expected because of a current or recent defrosting temperature changes in the evaporation tray 9, suspend until these temperature changes have subsided again.
  • the control unit 13 has means for detecting a past power failure and is set up when a power failure has been detected, immediately perform a measurement of the water level.
  • Fig. 4 shows by way of example a typical relationship between the rate of rise dT / dT of the temperature T detected by the sensor 15 and the water level h.
  • the curve is horizontal at a high level, corresponding to the section a of Fig.
  • it is inversely proportional to the amount of water in the flat shell 18, ie it has a hyperbolic Course up, as shown in section b.
  • the dependence of the rate of change on the water level h is greatest when the amount of water in the shallow bowl 18 is low but not zero. Heating element 10 and temperature sensor 15 are therefore expediently mounted just below that level that the water level may not exceed without overflow.
  • Fig. 5 shows a second embodiment of the evaporation arrangement 9 in cross section.
  • the shells 16, 18 have the same shape as in the case of Fig. 1 and 2 , And also arranged in the flat shell 18 heating element 10 is the same. Added is in Fig. 5 a second heating element 20 in the shell 16. While the rate of increase of the temperature at the sensor 15 is measured, the control unit 13 operates only the Heating element 10, to gain information about the water level with the least possible use of energy. If the result of the measurement is that there is an overflow hazard, then both heating elements 10, 20 are operated for a while, in order to heat the entire water contained in the evaporation arrangement 9 in a short time and to achieve rapid evaporation.
  • Fig. 6 shows in one too Fig. 5 analogous section an evaporation arrangement 9 according to a third embodiment of the invention.
  • a shell 16 is mounted directly on the (not shown) compressor 6. Between it and an adjacent shell 21, a continuous barrier 22 is formed, whose upper edge defines the overflow level, beyond which the shell 21 is flooded.
  • the heating element 10 is mounted in the shell 21 just above the barrier 22. If the shell 16 overflows, this has so long as no effect on the heating rate of the heating element 20 and its associated sensor 15, as the water level does not reach the heating element 10. As soon as this happens, the rate of increase in temperature decreases. Since the water level in the shell 21 is clearly different from zero at this time, the rate of increase jumps abruptly, as in FIG Fig.
  • the 8 and 9 each show in section along the plane VIII-VIII Fig. 9 or in plan view, an evaporation arrangement 9 according to a fourth embodiment of the invention.
  • the shells 16, 18 are in turn substantially the same shape as in the first embodiment, but between them a barrier 23 in height of the shells 16, 18 surrounding walls is formed, which must not be rinsed by the water during operation. Only over a gap 24 of the barrier, an exchange of water between the shells 16, 18 is possible.
  • the outflow of water heated to the heating element 10 into the shell 16 is restricted so that the water in the shell 18 heats up faster than in the case of the first embodiment. Therefore, a precise assessment of the water level is still possible even if the water level is significantly above the heating element 10.
  • Fig. 10 shows in one too Fig. 1 analog section of a refrigerator according to a fifth embodiment of the invention.
  • the evaporation arrangement 9 here comprises two shells 16, 25, which are arranged at different levels.
  • the shell 16 mounted on the compressor 6 includes an overflow edge 26 through which water, when rising above the overflow level, drains into the underlying shell 25.
  • a heating element 10 and a temperature sensor 15 are arranged, which can be used by the control unit 13 in the same manner as described with reference to the first embodiment to assess the water level in the shell 25 and the water in the shell 25th to evaporate if the water level in it is judged to be dangerously high.
  • the heating of the shell 25 does not promote the evaporation in the shell 16, as, unlike the previously considered embodiments, a backflow of heated at the heating element 10 water in the shell 16 is not possible, but this can readily be accepted Since the possibility of accommodating much free water surface in a limited volume can take place at the evaporation, this disadvantage is at least compensated for and the shell 16 is heated by the compressor 6 on which it is mounted.
  • An evaporation arrangement 9 according to a sixth embodiment of the invention is in Fig. 11 shown.
  • a shell 16 is mounted in a conventional manner. From the bottom of the shell 16 is a hollow column 27 from. An annular, at least one slot 29 projects around the upper side 28 of the column openwork bridge 30 on. The top 28 and the land define a flooding zone 31.
  • a metal pin 32 extends inside the column from the compressor housing to the top 28 and feeds waste heat from the compressor preferably to the flooding zone 31, so that when the compressor 6 is running, the temperature in the Flooding zone 31 rises much faster than in the surrounding shell 16, and is registered by a temperature sensor 10 arranged there.
  • a heating device arranged in the shell 16 in this case a heating rod 32 bent into a ring, is switched on and operated for a predetermined time in order to lower the water level below the height of the top side 28.

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  • 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)
  • Removal Of Water From Condensation And Defrosting (AREA)
EP12780140.5A 2011-10-18 2012-10-11 Kältegerät mit verdunstungsschale und heizeinrichtung zur verdunstungsförderung Active EP2769156B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110084717 DE102011084717A1 (de) 2011-10-18 2011-10-18 Kältegerät mit Verdunstungsschale und Heizeinrichtung zur Verdunstungsförderung
PCT/EP2012/070204 WO2013057040A2 (de) 2011-10-18 2012-10-11 Kältegerät mit verdunstungsschale und heizeinrichtung zur verdunstungsförderung

Publications (2)

Publication Number Publication Date
EP2769156A2 EP2769156A2 (de) 2014-08-27
EP2769156B1 true EP2769156B1 (de) 2015-12-30

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EP12780140.5A Active EP2769156B1 (de) 2011-10-18 2012-10-11 Kältegerät mit verdunstungsschale und heizeinrichtung zur verdunstungsförderung

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Country Link
EP (1) EP2769156B1 (zh)
CN (1) CN103890509B (zh)
DE (1) DE102011084717A1 (zh)
WO (1) WO2013057040A2 (zh)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013212893A1 (de) * 2013-07-02 2015-01-08 Robert Bosch Gmbh Verfahren zu einem Betreiben einer Wärmepumpe
CN104720443A (zh) * 2015-03-19 2015-06-24 苏州市小伙伴电器有限公司 能防止蓄水盒溢水的食品冷藏展示柜
DE102019200631A1 (de) 2019-01-18 2020-07-23 BSH Hausgeräte GmbH Kältegerät

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
DE4418313C2 (de) * 1994-05-26 1997-09-25 Danfoss As Tauwasserschale für eine Kälteanlage
DE29820730U1 (de) * 1998-11-19 1999-05-06 Liebherr-Hausgeräte GmbH, 88416 Ochsenhausen Verdunstungsschale
CN2777456Y (zh) * 2005-03-15 2006-05-03 胡欢炎 一种采用吸塑接水盘的冰箱
AT8933U1 (de) * 2005-12-20 2007-02-15 Acc Austria Gmbh Kältemittelkompressor
JP2009085473A (ja) 2007-09-28 2009-04-23 Sanyo Electric Co Ltd 低温貯蔵庫
JP2011137561A (ja) * 2009-12-25 2011-07-14 Hoshizaki Electric Co Ltd 冷蔵庫の排水蒸発装置
CN102297557B (zh) * 2011-07-14 2015-08-26 合肥美的电冰箱有限公司 冰箱

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Publication number Publication date
CN103890509B (zh) 2015-12-23
WO2013057040A3 (de) 2013-07-18
EP2769156A2 (de) 2014-08-27
WO2013057040A2 (de) 2013-04-25
CN103890509A (zh) 2014-06-25
DE102011084717A1 (de) 2013-04-18

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