EP3701204B1 - Kältegerät mit vertikal luftdurchströmtem verdampfer - Google Patents

Kältegerät mit vertikal luftdurchströmtem verdampfer Download PDF

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Publication number
EP3701204B1
EP3701204B1 EP18786304.8A EP18786304A EP3701204B1 EP 3701204 B1 EP3701204 B1 EP 3701204B1 EP 18786304 A EP18786304 A EP 18786304A EP 3701204 B1 EP3701204 B1 EP 3701204B1
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EP
European Patent Office
Prior art keywords
evaporator
refrigeration appliance
appliance according
partition wall
inlet volume
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
EP18786304.8A
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German (de)
English (en)
French (fr)
Other versions
EP3701204A1 (de
Inventor
Markus Arbogast
Michaela Malisi
Felix WIEDENMANN
Frank Cifrodelli
Thomas Bischofberger
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 Hausgeraete GmbH
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Filing date
Publication date
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Publication of EP3701204A1 publication Critical patent/EP3701204A1/de
Application granted granted Critical
Publication of EP3701204B1 publication Critical patent/EP3701204B1/de
Active 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
    • F25D21/04—Preventing the formation 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
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
    • 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
    • F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
    • F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
    • 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
    • F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
    • F25D2317/06—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation
    • F25D2317/063—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation with air guides
    • 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
    • F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
    • F25D2317/06—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation
    • F25D2317/065—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation characterised by the air return

Definitions

  • the present invention relates to a refrigeration appliance, in particular a domestic refrigeration appliance, with a housing in which a number of storage chambers, in particular storage chambers for different operating temperatures, such as a freezer compartment and a normal refrigeration compartment, are accommodated.
  • Such domestic refrigeration appliances are often designed as full no-frost appliances.
  • the individual storage chambers are cooled by a common finned evaporator, which is housed in an evaporator chamber that is usually separated from the coldest storage chamber.
  • a common finned evaporator which is housed in an evaporator chamber that is usually separated from the coldest storage chamber.
  • the moisture carried by the air condenses on the fins of the evaporator and forms a layer of frost on them, which on the one hand impedes the heat exchange between the fins and the circulating air, and on the other hand the passages between narrows the fins of the evaporator, making air circulation more difficult.
  • the layer of frost must therefore be thawed regularly.
  • An uneven distribution of the frost in the evaporator means that areas of the evaporator with thin frost become free of ice faster than areas with thick frost and heat up to a temperature well above freezing point in the time it takes for the thick frosted areas to defrost. This leads to high energy consumption, on the one hand because of the long duration of the defrosting process and on the other hand because the unnecessarily heated parts of the evaporator have to be cooled down again before the evaporator can cool the storage chambers again.
  • JP S64 5076 U and EP 2 146 164 A2 disclose further refrigeration devices known from the prior art.
  • One object of the invention is therefore to further develop a refrigeration device in the NoFrost design with a vertical flow evaporator in such a way that the time interval between two defrosting processes can be made longer and rapid, energy-efficient defrosting is possible.
  • a refrigeration device is provided with an evaporator arranged in an evaporator chamber, through which air flows from bottom to top, and at least one first and one second storage chamber cooled by air exchange with the evaporator chamber, with an elongated inlet volume being kept free in the evaporator chamber below a lower inflow side of the evaporator and exhaust air lines the two storage chambers open into the inlet volume on different sides of a plane extending in the longitudinal direction through the inlet volume, a partition wall running in the plane protrudes from the lower inflow side into the inlet volume.
  • the dividing wall forces the air flowing in via the exhaust air ducts to spread over the entire length of the inflow side and thus also a largely uniform distribution of the frost separated from this air in the evaporator in the longitudinal direction of the inlet volume. Rapid freezing of an area of the evaporator that is heavily exposed to the inflow of air is thus avoided, and a large amount of frost can collect in the evaporator before its flow resistance makes defrosting necessary.
  • the even distribution of the frost also has the consequence that if, towards the end of a defrosting process, the evaporator has icy and ice-free areas, the heat absorbed by an ice-free area only has to flow over a short distance in the evaporator before it reaches an area that is still icy. In this way, useless heating of the ice-free areas is kept to a minimum, and the defrosting process can be completed in a short time and without unnecessary energy consumption.
  • Fins of the evaporator are preferably oriented transversely to the partition so that a space between two fins can receive air from both exhaust air ducts.
  • a large volume is available inside the evaporator to collect frost in it, and the time interval between two defrosting processes can be chosen to be large.
  • the air flowing through a space between two fins can avoid the frost that has condensed out in the space for a long time without having to leave the space, so that a low flow resistance of the evaporator is maintained for a long time even with progressive frost formation.
  • a lower edge of the partition should run within the intake volume, spaced from the bottom of the intake volume, so as not to completely seal off the two parts of the intake volume from one another and, if the lower upstream side on one side of the partition wall is largely clogged with frost, the air flowing in on that side will have a evasion to allow the possibly not yet clogged rest of the lower inflow side on the other side of the partition.
  • the partition In order to simplify the installation of the partition, it can be anchored to the evaporator in order to be inserted together with this as a single assembly in the refrigerator.
  • Individual fins of the evaporator can protrude below the inflow side. These fins can serve as a holder for a defrost heater.
  • the partition wall can also extend between them.
  • the evaporator chamber and the first storage chamber can be located at substantially the same level and separated from each other by a vertical partition.
  • the exhaust air line of the first storage chamber can open into the inlet volume via a horizontally elongated gap.
  • This gap should extend over at least 90% of the width of the evaporator; in particular, it can extend over the entire width of an inner container, in in which the evaporator chamber and the first storage chamber are housed together and separated from one another by the vertical partition.
  • the gap should run above a lower edge of the partition wall so that air flowing in via the gap can only reach a side of the partition wall facing away from the gap after being deflected at the partition wall and therefore predominantly via a part of the lower wall extending between the partition wall and the vertical intermediate wall Inflow side enters the evaporator.
  • the evaporator can also have a lateral inflow surface, and the exhaust air line of the second storage chamber can open into the inlet volume via an air space adjoining the lateral inflow surface.
  • the inlet volume can accommodate a defrost heater.
  • the defrost heater In order to act on the evaporator over the entire inflow side, the defrost heater should extend on both sides of the partition.
  • condensation water collection channel In order to drain condensation water, a condensation water collection channel should run under the lower inflow side.
  • a fan can be provided to drive air exchange with both storage chambers simultaneously.
  • the length and passage cross-sections of lines that connect the evaporator chamber to the first and second storage chamber can be designed according to the average cooling requirement of the two storage chambers so that when one of the two storage chambers is sufficiently supplied with cold air from the evaporator chamber, the other is oversupplied. A flap in the supply or exhaust air line of the other storage chamber is then sufficient to be able to supply both storage chambers as required.
  • the air exchange with the first Storage chamber to be stronger than with the second.
  • FIG. 1 1 shows a NoFrost combination refrigeration appliance in a schematic section in the depth direction.
  • a body 1 of the refrigerating appliance two cavities are delimited by inner containers 2 deep-drawn in one piece from plastic in a manner customary in the art.
  • One of the cavities is a storage chamber, here a normal refrigeration compartment 3 .
  • the other cavity is divided by a vertical partition 4 into a second storage chamber, here a freezer compartment 5 , and an evaporator chamber 6 .
  • the evaporator chamber 6 contains a finned evaporator 7 with fins arranged parallel to the section plane. Below the finned evaporator 7, an inlet volume 8 of the evaporator chamber 6 extends over the entire width of the lower inner container 2. A lower edge 9 of the partition 4 and the top of a step 10 of the inner container 2 delimit an entry gap 11 of the evaporator chamber 6. The step 10 and one of the The wall 12 following the contour of the stage 10 at a constant distance delimit an exhaust air line 13 of the freezer compartment 5, via which the air in the freezer compartment 5 is sucked off near the floor and fed to the evaporator chamber 6. The entrance slit 11 extends, like the inlet volume, over the entire width of the lower inner container 2 in order to distribute the exhaust air from the freezer compartment to the evaporator 7 evenly over its width.
  • Adjacent to the inlet volume 8 below the evaporator 7 is an air space 14 which is delimited by a bulge in the lower inner container 2 which engages in the insulating material layer 15 of the body 1 .
  • the air space 14 extends along a broad side of the evaporator 7 facing away from the freezer compartment 5 over a part, preferably not more than half, of its height.
  • A running outside the cutting plane, e.g. in a side wall of the body 1 and therefore in 1
  • the exhaust air line 15 of the normal refrigeration compartment 5 opens into the air space 14 via an opening cut into the bulge of the lower inner container 2.
  • the gaps between the fins of the evaporator 7 are along a lower inflow side 17 to the inlet volume 8 and via a lateral inflow surface 18 open to airspace 14.
  • the vertical intermediate wall 4 contains a distribution chamber 19 which communicates with a free space 21 of the evaporator chamber 6 above the evaporator 7 via an opening at which a fan 20 is arranged.
  • An outlet 22 of the distribution chamber opens into the freezer compartment 5 close to the ceiling.
  • Another outlet is formed by a line 23 extending in a wall of the body 1 to the normal cooling compartment 3 .
  • a flap 24 controlled by a thermostat can be provided in this line 23, which flap allows the cold air supply to the normal cooling compartment 3 to be prevented if cooling is only required in the freezer compartment 5. If there is a cooling requirement in the normal cooling compartment 5 and the flap 24 is therefore open, the cold air circulated by the fan 20 is distributed to both storage chambers 3, 5.
  • the exhaust air line 15 can open into the air space 14 opposite the inflow surface 18 of the evaporator 7 or on a narrow side thereof; In both cases, the exhaust air from the normal refrigeration compartment tends to enter the evaporator 7 in the immediate vicinity of where it opens out, where it separates the moisture that is carried along. If this happens along the entire exposed edge of an intermediate space between the slats, along the inflow surface 18 and the lower inflow side 17, the exhaust air from the standard refrigeration compartment must be contained in the evaporator chamber 6 Cover detours so that the distribution of the circulated air in normal cooling compartment 3 and freezer compartment 5 shifts to the disadvantage of normal cooling compartment 3.
  • the flow resistance of the evaporator 7 also increases, so that either the air throughput decreases overall or a higher output of the fan 20 is required in order to keep the air throughput constant. In both cases, however, the cooling capacity of the evaporator 7 decreases. In order to maintain good energy efficiency of the refrigeration device, the evaporator 7 must therefore be defrosted.
  • a partition wall 25 is mounted in the inlet volume 8 .
  • An enlarged view of the evaporator chamber 6 with the partition wall 25 is shown in FIG 2 shown.
  • the section through the evaporator 7 shows one of its fins 26 in a plan view. Its lower edge and that of a large number of other lamellae of the same shape define the lower inflow side 17 .
  • One of these slats 27 is in 2 to see.
  • a slot 28 is cut out, into which a defrosting heater 29 bent in the shape of a hairpin is inserted.
  • the partition wall 25 extends between the two legs of the defrost heater 29.
  • the upper side of the step 10 forms a channel 30 directly below the evaporator and rises from the channel 30 to the freezer compartment 5 , so that the entry gap 11 runs significantly higher than the bottom of the channel 30 .
  • a lower edge 31 of the partition wall 25 is lower than the entry gap 11, so that the exhaust air from the freezer compartment 5, which is guided horizontally in the exhaust air line 13 before reaching the entry gap 11, strikes the partition wall 25 and is deflected at it. Due to the suction emanating from the fan 20 , the exhaust air flows upwards essentially in front of the partition wall 25 and passes through the lower inflow side 17 in its front part facing the entry gap 11 .
  • the partition wall 25 prevents the relatively moist exhaust air from the normal cooling compartment 3 from penetrating from the air space 14 into the front part of the inflow side 17 and thus delays the formation of frost there. Instead, it forces the exhaust air from the standard refrigeration compartment 3 to deviate sideways and to be distributed over the width of the evaporator 7 in the rear part of the inflow side 17, thus also reaching the spaces between the fins. which are not adjacent to the airspace 14. Since frost consequently also forms in these gaps, the capacity of the evaporator 7 for frost is better utilized and the time before defrosting becomes necessary is extended.
  • the partition wall 25 By deflecting the exhaust air from the normal refrigeration compartment 3 in the width direction of the evaporator 7, the partition wall 25 also brings about an improved match between the frost distribution and the power distribution of the defrost heater 29, which extends over the entire width of the evaporator 7. Temperature gradients that occur within the evaporator 7 during defrosting Resulting from the fact that some parts of the evaporator 7 become ice-free earlier than others and can therefore heat up to temperatures above 0°C, therefore remain low, which improves the energy efficiency of the defrosting process.
  • Water released during defrosting drips from the inflow side 17 into the channel 30 and escapes in a manner known per se via a drain (not shown) at the lowest point of the channel 30 to the outside.
  • the partition wall 25 Due to its placement between the legs of the defrost heater 29, the partition wall 25 is to a large extent exposed to thermal radiation emanating from there and, in particular, catches part of the radiation that would have hit the inner container 2 or the intermediate wall 4 and heated them without the partition wall 25 to promote the defrosting process. If the partition wall 25 absorbs this radiation and heats up in the process, it can either transfer the heat to the air in the inlet volume 8 and in this way intensify the heat supply to the upstream side 17, or it can transfer the heat directly into the air through physical contact with the fins 26 Introduce evaporator 7.
  • the partition 25a is a simple planar blank of sheet material, such as spring steel, aluminum sheet, or the like.
  • Projections 33 are formed on two narrow sides 32 of the partition 25a, which are provided in order to engage in the slots 28 of the fins 27 between the legs of the defrost heater 29 and thus to anchor the partition 25a under the evaporator 7. In order to be able to insert the projections 33 into the slots 28, it is sufficient to bend the partition wall 25a slightly.
  • the slots 28, as shown in an example on the narrow side 32 on the right, can be provided with notches 34 on the top and bottom, in which the top and bottom edges of the projections 33 can latch.
  • the partition wall 25b is also a blank from flat material. Several pairs of spring arms 35 are deflected out of the plane of the blank, which in 3 diverge upwards in the installation orientation shown and at the ends of which arcs 36 are formed which engage in each case on the legs of the defrost heater. Introductory bevels 37 above the bends 36 facilitate the insertion of the partition wall 25b between the legs of the defrost heater 29 and the latching on the legs.
  • notches 39 are distributed in an upper edge 38 of the partition wall 25c so that each of them receives the lower edge of a fin 26.
  • the straight top edges 38 of partitions 25a or 25b could engage notches on the bottom edges of slats 26, respectively; such notches could also contribute to locking the partition 25a or 25b in the upright position on the evaporator 7.

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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)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
EP18786304.8A 2017-10-25 2018-10-12 Kältegerät mit vertikal luftdurchströmtem verdampfer Active EP3701204B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017219162.7A DE102017219162A1 (de) 2017-10-25 2017-10-25 Kältegerät mit vertikal durchströmtem Verdampfer
PCT/EP2018/077824 WO2019081221A1 (de) 2017-10-25 2018-10-12 Kältegerät mit vertikal luftdurchströmtem verdampfer

Publications (2)

Publication Number Publication Date
EP3701204A1 EP3701204A1 (de) 2020-09-02
EP3701204B1 true EP3701204B1 (de) 2023-08-02

Family

ID=63857938

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18786304.8A Active EP3701204B1 (de) 2017-10-25 2018-10-12 Kältegerät mit vertikal luftdurchströmtem verdampfer

Country Status (5)

Country Link
EP (1) EP3701204B1 (pl)
CN (1) CN111263874A (pl)
DE (1) DE102017219162A1 (pl)
PL (1) PL3701204T3 (pl)
WO (1) WO2019081221A1 (pl)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020006408A1 (de) 2020-10-19 2022-04-21 Truma Gerätetechnik GmbH & Co. KG Klimaanlage

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS645076U (pl) * 1987-06-26 1989-01-12
JPH11304335A (ja) * 1998-04-20 1999-11-05 Fujitsu General Ltd 電気冷蔵庫
IT1391479B1 (it) * 2008-07-15 2011-12-23 Indesit Co Spa Apparecchio di refrigerazione di uso domestico, in particolare del tipo no-frost
DE102014218411A1 (de) 2014-09-15 2016-03-17 BSH Hausgeräte GmbH Kältegerät mit mehreren Lagerkammern
CN106482438A (zh) * 2016-11-23 2017-03-08 合肥华凌股份有限公司 双开门冰箱

Also Published As

Publication number Publication date
CN111263874A (zh) 2020-06-09
EP3701204A1 (de) 2020-09-02
WO2019081221A1 (de) 2019-05-02
PL3701204T3 (pl) 2024-01-08
DE102017219162A1 (de) 2019-04-25

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