EP0805321B1 - Cooling and/or freezing apparatus - Google Patents
Cooling and/or freezing apparatus Download PDFInfo
- Publication number
- EP0805321B1 EP0805321B1 EP96114834A EP96114834A EP0805321B1 EP 0805321 B1 EP0805321 B1 EP 0805321B1 EP 96114834 A EP96114834 A EP 96114834A EP 96114834 A EP96114834 A EP 96114834A EP 0805321 B1 EP0805321 B1 EP 0805321B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- interior
- cooling
- connection opening
- air
- compressor
- 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
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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
- 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
- F25D17/042—Air treating means within refrigerated spaces
- F25D17/047—Pressure equalising 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
- 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
- F25D2400/10—Refrigerator top-coolers
Definitions
- the invention relates to a refrigerator and / or freezer according to the Preamble of claim 1.
- a refrigerator and / or freezer according to the Preamble of claim 1.
- Such a device is, for example, from the US-A-2 604 760.
- Refrigerators and freezers as well as fridge-freezers exist one with one or more doors or lids Inner space.
- the surfaces of the interior are intermittent working refrigeration device, for example a compressor cooling system chilled to those in the refrigerator and freezer or the fridge-freezer combination to a desired bring or maintain low temperature.
- the temperatures are closed Interior lowered, reducing the pressure of the air in the interior compared to the pressure of the surrounding atmosphere. Based on these Pressure difference flows uncontrolled ambient air over the finest Leaks in the interior, so that the pressure difference is balanced over time. With the comparatively warmer Ambient air transports moisture into the interior, due to the lower dew point on the cold surfaces of the interior, for example on the evaporator. This precipitate freezes in a freezer due to the low temperatures prevailing in the interior.
- the silica gel bed which serves as a desiccant after it has the moisture flowing in Has taken up air, regenerated by a heating element provided in the connection opening become.
- the heating element is only activated when the compressor is switched off. This requires a comparatively complicated circuit of the heating element used to regenerate the silica gel.
- the silica gel is also heated by an external heat source. This heat is absorbed by the inflowing but heated silica gel Air and transports it into the interior of the refrigerator, yes just to be cooled down.
- the object of the invention is, based on US-A-2 604 760, a refrigerator and / or freezer to create that has the simplest possible structure and on the other hand good cooling performance guaranteed without the interior of the device icing up too much.
- this task is based on a generic Refrigerator and / or freezer by the features of the characteristic Part of the main claim solved. Accordingly, one Connection opening between the interior of the device with the Ambient atmosphere created. Through this opening can be targeted the pressure equalization take place. In addition, the Connection opening exchanged air according to the invention on a desired degree of dryness. This is done within air drying is carried out at the connection opening.
- This air drying takes place in that a regenerable drying agent, for example Molecular sieve is arranged.
- a regenerable drying agent for example Molecular sieve is arranged.
- the compressor runtime i.e. during the cooling phase, in which inside the device a negative pressure is generated, the incoming ambient air dried.
- the moisture it contains will for example, taken up by the molecular sieve and bound there.
- the compressor stops the air inside the device warms up, so that there is an overpressure in the interior.
- the dry cold air can flow out and the Molecular sieve removes moisture.
- the moisture will transported outside and released back into the outside atmosphere.
- the freezer 10 shown in FIG. 1 has a coolable interior 12, in which the to be cooled or frozen can be stored well.
- the cooling takes place through cooled inner walls 14.
- the cooling of the inner walls 14 takes place via heat exchanger tubes 16, with one here Compressor cooling system not shown in connection stand.
- the interior 12 can be closed by a cover 18 be, with a largely tight closability over circumferential Seals 20 is ensured.
- a pressure equalization during the cooling process Comparatively moist ambient air flows in via fine Leaks in the sealing area of the seal 20 in the interior 12. This is indicated in Fig. 1 by corresponding arrows a.
- the embodiment shown in FIG. 2 relates basically a freezer that in structure to the one corresponds to the state of the art. Therefore here Identical parts with the same reference numerals.
- Within the connection opening 24 contains a molecular sieve bed 26.
- Targeted air is exchanged between the interior 12 and the surrounding atmosphere can be.
- the compressor runtime in which a negative pressure forms in the interior 12, the more or less humid ambient air is sucked in.
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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)
- Drying Of Solid Materials (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
Description
Die Erfindung betrifft ein Kühl- und/oder Gefriergerät nach dem Oberbegriff des Patentanspruchs 1. Ein solches Gerät ist, z.B., aus der US-A-2 604 760 bekannt.The invention relates to a refrigerator and / or freezer according to the Preamble of claim 1. Such a device is, for example, from the US-A-2 604 760.
Kühl- und Gefriergeräte sowie Kühl-Gefrierkombinationen bestehen aus einem mit einer oder mehreren Türen oder Deckeln versehenen Innenraum. Die Oberflächen des Innenraums werden über eine intermittierend arbeitende Kälteeinrichtung, beispielsweise ein Kompressor-Kühlsystem gekühlt, um die in dem Kühl- und Gefriergerät bzw. der Kühl-Gefrierkombination aufbewahrten Waren auf eine gewünschte tiefe Temperatur zu bringen bzw. auf dieser zu halten.Refrigerators and freezers as well as fridge-freezers exist one with one or more doors or lids Inner space. The surfaces of the interior are intermittent working refrigeration device, for example a compressor cooling system chilled to those in the refrigerator and freezer or the fridge-freezer combination to a desired bring or maintain low temperature.
Während des Kühlvorganges werden die Temperaturen im geschlossenen Innenraum abgesenkt, wodurch der Druck der Luft im Innenraum gegenüber dem Druck der Umgebungsatmosphäre sinkt. Aufgrund dieser Druckdifferenz strömt unkontrolliert Umgebungsluft über feinste Undichtigkeiten in den Innenraum, so daß die Druckdifferenz mit der Zeit ausgeglichen wird. Mit der vergleichsweise wärmeren Umgebungsluft wird Feuchtigkeit in den Innenraum transportiert, die sich aufgrund des tieferen Taupunkts an den kalten Oberflächen des Innenraums, beispielsweise am Verdampfer niederschlägt. In einem Gefriergerät gefriert dieser Niederschlag aufgrund der im Innenraum herrschenden tiefen Temperaturen. During the cooling process, the temperatures are closed Interior lowered, reducing the pressure of the air in the interior compared to the pressure of the surrounding atmosphere. Based on these Pressure difference flows uncontrolled ambient air over the finest Leaks in the interior, so that the pressure difference is balanced over time. With the comparatively warmer Ambient air transports moisture into the interior, due to the lower dew point on the cold surfaces of the interior, for example on the evaporator. This precipitate freezes in a freezer due to the low temperatures prevailing in the interior.
Ein weiteres Problem bei Gefriergeräten und in geringerem Maße auch bei Kühlgeräten ergibt sich durch den sich nach jeder Tür- bzw. Deckelöffnung einstellenden Unterdruck im Innenraum des Gerätes. Dieser Unterdruck resultiert daraus, daß bei jeder Geräteöffnung warme Luft in den Innenraum gelangt, die nach Schließen des Gerätes stark unterkühlt wird und somit ihr Volumen verringert. Hierdurch bildet sich ein Unterdruck, der den Deckel bzw. die Tür mit ihrer Dichtung an das Gehäuse saugt. Je nach Dichtigkeit ist nun ohne mechanische Hilfsmittel oder sonstige Vorrichtungen zur Herstellung eines Druckausgleichs das Gerät für eine bestimmte Zeit nicht mehr zu öffnen. Dieser Zeitraum hängt nun davon ab, wie dicht das Gerät ist. Durch die bereits zuvor erwähnten feinen Undichtigkeiten in den Dichtungen bzw. am Gehäuse erfolgt wieder der Druckausgleich mit der Umgebungsatmosphäre. Nach entsprechendem Abbau des Druckunterschieds zwischen Innenraum und Umgebungsatmosphäre läßt sich die Tür wieder öffnen.Another problem with freezers and to a lesser extent cooling devices also result from the fact that after each door or vacuum opening in the interior of the device. This negative pressure results from the fact that every time the device is opened warm air enters the interior after closing of the device is strongly supercooled and thus its volume is reduced. This creates a negative pressure, which the door with its seal sucks on the housing. Depending on the tightness is now without mechanical aids or other devices the device for a pressure equalization no longer open at certain times. This period now depends depends on how tight the device is. By the ones already mentioned fine leaks in the seals or on the housing the pressure is equalized again with the ambient atmosphere. After reducing the pressure difference between the interior accordingly and the surrounding atmosphere can be opened again.
Nach dem Stand der Technik gemäß der US-A-2 604 760 muß die Silica GelSchüttung, die als Trocknungsmittel dient, nachdem sie die Feuchtigkeit der einströmenden Luft aufgenommen hat, durch ein in der Verbindungsöffnung vorgesehenes Heizelement regeneriert werden. Um die angesaugte Luft, die ja im Kühlschrank heruntergekühlt werden soll, nicht unnötig aufzuheizen und damit die Kühlleistung des Kühlgerätes herunterzusetzen, wird entsprechend der US-A-2 604 760 das Heizelement nur dann aktiviert, wenn der Kompressor ausgeschaltet ist. Dies bedingt eine vergleichsweise komplizierte Schaltung des Heizelementes, das zur Regenerierung des Silica Gels dient. Darüber hinaus wird auch bei dieser Lösung das Silica Gel durch eine externe Wärmequelle aufgeheizt. Diese Wärme nimmt die über das regenerierte aber aufgeheizte Silica Gel einströmende Luft auf und transportiert sie in den Innenraum des Kühlgerätes, der ja gerade heruntergekühlt werden soll.According to the state of the art according to US-A-2 604 760, the silica gel bed, which serves as a desiccant after it has the moisture flowing in Has taken up air, regenerated by a heating element provided in the connection opening become. For the air drawn in, which is supposed to be cooled down in the refrigerator, not heating up unnecessarily and thus reducing the cooling capacity of the cooling device, according to US-A-2 604 760, the heating element is only activated when the compressor is switched off. This requires a comparatively complicated circuit of the heating element used to regenerate the silica gel. Furthermore With this solution, the silica gel is also heated by an external heat source. This heat is absorbed by the inflowing but heated silica gel Air and transports it into the interior of the refrigerator, yes just to be cooled down.
Aufgabe der Erfindung ist es, ausgehend von der US-A-2 604 760 ein Kühl- und/oder Gefriergerät zu schaffen, das einen möglichst einfachen Aufbau aufweist und andererseits eine gute Kühlleistung gewährleistet, ohne daß der Innenraum des Gerätes zu stark vereist.The object of the invention is, based on US-A-2 604 760, a refrigerator and / or freezer to create that has the simplest possible structure and on the other hand good cooling performance guaranteed without the interior of the device icing up too much.
Erfindungsgemäß wird diese Aufgabe ausgehend von einem gattungsgemäßen Kühl- und/oder Gefriergerät durch die Merkmale des kennzeichnenden Teils des Hauptanspruchs gelöst. Demnach wird eine Verbindungsöffnung zwischen dem Innenraum des Gerätes mit der Umgebungsatmosphäre geschaffen. Durch diese Öffnung kann gezielt der Druckausgleich stattfinden. Zusätzlich wird die durch die Verbindungsöffnung ausgetauschte Luft erfindungsgemäß auf einen gewünschten Trocknungsgrad eingestellt. Hierzu wird innerhalb der Verbindungsöffnung eine Lufttrocknung durchgeführt. According to the invention, this task is based on a generic Refrigerator and / or freezer by the features of the characteristic Part of the main claim solved. Accordingly, one Connection opening between the interior of the device with the Ambient atmosphere created. Through this opening can be targeted the pressure equalization take place. In addition, the Connection opening exchanged air according to the invention on a desired degree of dryness. This is done within air drying is carried out at the connection opening.
Diese Lufttrocknung erfolgt dadurch, daß in der Verbindungsöffnung ein regenerierbares Trocknungsmittel, beispielsweise Molekularsieb, angeordnet ist. Während der Kompressorlaufzeit, d.h. während der Kühlphase, in welcher im Geräteinnenraum ein Unterdruck erzeugt wird, wird die einströmende Umgebungsluft getrocknet. Die in ihr enthaltene Feuchtigkeit wird beispielsweise vom Molekularsieb aufgenommen und dort gebunden. Wenn nun der Kompressor stillsteht erwärmt sich die Luft im Geräteinnenraum, so daß im Innenraum ein Überdruck entsteht. Hierdurch kann die trockene kalte Luft nach außen strömen und dem Molekularsieb die Feuchtigkeit entziehen. Die Feuchtigkeit wird nach außen transportiert und wieder an die Außenatmosphäre abgegeben. This air drying takes place in that a regenerable drying agent, for example Molecular sieve is arranged. During the compressor runtime, i.e. during the cooling phase, in which inside the device a negative pressure is generated, the incoming ambient air dried. The moisture it contains will for example, taken up by the molecular sieve and bound there. When the compressor stops, the air inside the device warms up, so that there is an overpressure in the interior. Hereby the dry cold air can flow out and the Molecular sieve removes moisture. The moisture will transported outside and released back into the outside atmosphere.
Weitere Einzelheiten und Vorteile der Erfindung werden anhand eines in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert. Es zeigen:
- Fig. 1:
- ein Gefriergerät im schematischen Schnitt nach dem Stand der Technik,
- Fig. 2:
- ein Gefriergerät gemäß einer ersten Ausführungsform der Erfindung in einer vereinfachten Schnittdarstellung,
- Fig. 1:
- a freezer in schematic section according to the prior art,
- Fig. 2:
- a freezer according to a first embodiment of the invention in a simplified sectional view,
Das in Fig. 1 dargestellte Gefriergerät 10 nach dem Stand der
Technik weist einen kühlbaren Innenraum 12 auf, in welchem das
zu kühlende bzw. gefrierende Gut lagerbar ist. Die Kühlung erfolgt
durch gekühlte Innenwandungen 14. Die Kühlung der Innenwandungen
14 erfolgt über Wärmetauscherrohre 16, die mit einem hier
nicht näher dargestellten Kompressor-Kühlsystem in Verbindung
stehen. Der Innenraum 12 kann über einen Deckel 18 verschlossen
werden, wobei eine weitgehend dichte Verschließbarkeit über umlaufende
Dichtungen 20 sichergestellt ist. Bei diesem Gefriergerät
10 nach dem Stand der Technik erfolgt, wie durch die Pfeile
a dargestellt, ein Druckausgleich während des Kühlvorgangs durch
Einströmen vergleichsweiser feuchter Umgebungsluft über feine
Undichtigkeiten im Dichtungsbereich der Dichtung 20 in den Innenraum
12. Dies ist in Fig. 1 durch entsprechende Pfeile a angedeutet.
Umgekehrt entweicht während des Kompressorstillstandes die
sich im Innenraum 12 aufwärmende Luft in Pfeilrichtung b in die
Umgebung. Aufgrund des unkontrollierten Einströmens von vergleichsweise
feuchter Umgebungsluft in den Innenraum während des
Kühlzyklus schlägt sich vergleichsweise viel Feuchtigkeit in
Form von Eis 22 an den Innenwandungen des Gefriergerätes 10 ab.The
Die in Fig. 2 dargestellte erfindungsgemäße Ausführungsform betrifft
grundsätzlich ein Gefriergerät, das in seinem Aufbau demjenigen
nach dem Stand der Technik entspricht. Daher sind hier
gleiche Teile mit gleichen Bezugszeichen versehen. Im Unterschied
zu dem Gefriergerät 10 nach dem Stand der Technik weist
das erfindungsgemäße Gefriergerät gemäß Fig. 2 jedoch eine Verbindungsöffnung
24 zwischen dem Innenraum 12 und der Umgebungsatmosphäre
auf, die in der hier dargestellten Ausführungsform im
Deckel 18 integriert ist. Innerhalb der Verbindungsöffnung 24
ist eine Molekularsiebschüttung 26 enthalten. Durch die Verbindungsöffnung
24 wird sichergestellt, daß je nach Druckverhältnis
zwischen Innenraum 12 und Umgebungsatmosphäre gezielt Luft ausgetauscht
werden kann. Während der Kompressorlaufzeit, in welcher
sich im Innenraum 12 ein Unterdruck bildet, wird die mehr oder
weniger feuchte Umgebungsluft angesaugt. Sie gibt ihre Feuchtigkeit
an das Molekularsieb 26 ab und gelangt in einem getrockneten
Zustand in den Innenraum 12. Hierbei ist der Taupunkt mittels
des Molekularsiebs 26 soweit herabgesetzt, daß ein Niederschlag
von Wasser in Form von Eis an den Innenwandungen 14 sicher
verhindert wird. Wenn der Kompressor steht, erwärmt sich
die Luft im Innenraum 12 und strömt aufgrund des sich dadurch
aufbauenden Überdrucks durch die Verbindungsöffnung 24 nach
außen. Die sich erwärmende trockene Luft entzieht während des
Ausströmens die im Molekularsieb gespeicherte Feuchtigkeit und
transportiert sie in die Umgebungsatmosphäre. Die Strömungsrichtung
der Luft ist mit Doppelpfeil c in Fig. 2 angedeutet.The embodiment shown in FIG. 2 relates
basically a freezer that in structure to the one
corresponds to the state of the art. Therefore here
Identical parts with the same reference numerals. The difference
to the
Claims (2)
- A cooling and/or freezing apparatus with an interior (12) to be opened via at least one door or one lid (18), which interior at least partly has cooled surfaces which can be cooled by an intermittently operating refrigerating means, the interior (12) communicating with the surrounding atmosphere via a connection opening (24), the air flowing in through the connection opening during the operating period of the compressor being adjustable to a desired degree of drying via a regenerable drying means (26),
characterized in that in the connection opening (24) the regenerable drying means (26) is arranged such that it is regenerated exclusively by the cold, dry air flowing out from the interior (12) into the surrounding atmosphere during the standstill of the compressor. - The cooling and/or freezing apparatus (10) as claimed in claim 1, characterized in that a molecular sieve (26) is used as regenerable drying means.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19617812 | 1996-05-03 | ||
DE19617812 | 1996-05-03 | ||
DE19628278A DE19628278A1 (en) | 1996-05-03 | 1996-07-12 | Refrigerator and / or freezer |
DE19628278 | 1996-07-12 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0805321A1 EP0805321A1 (en) | 1997-11-05 |
EP0805321B1 true EP0805321B1 (en) | 2001-12-05 |
Family
ID=26025371
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96114834A Expired - Lifetime EP0805321B1 (en) | 1996-05-03 | 1996-09-16 | Cooling and/or freezing apparatus |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0805321B1 (en) |
AT (1) | ATE210268T1 (en) |
ES (1) | ES2169187T3 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1659356A2 (en) | 2004-11-17 | 2006-05-24 | Liebherr-Hausgeräte Lienz GmbH | Refrigerator and/or freezing apparatus |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1845321B1 (en) | 2006-01-30 | 2017-07-26 | Whirlpool Corporation | Refrigerator with moisture adsorbing device |
GB2476412B (en) * | 2008-09-30 | 2012-06-06 | Thermo Fisher Scient Asheville | Frost reduction by active circulation |
EP2520882B1 (en) * | 2011-05-02 | 2017-09-27 | Whirlpool Corporation | Freezer with a reduced frost formation |
EP3364135B1 (en) * | 2017-02-16 | 2020-07-22 | Whirlpool Corporation | Chest freezer |
AT522200A1 (en) * | 2019-02-07 | 2020-09-15 | Rep Ip Ag | Transport container |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2259986A (en) * | 1939-08-30 | 1941-10-21 | Gen Electric | Refrigerator |
US2604760A (en) * | 1950-04-29 | 1952-07-29 | Gen Electric | Moisture collecting and removing arrangement |
DE1189566B (en) * | 1961-08-25 | 1965-03-25 | Bosch Gmbh Robert | Compression refrigeration system |
US3826106A (en) * | 1972-12-14 | 1974-07-30 | Kemp R | Refrigeration apparatus and process |
US5271762A (en) * | 1992-09-29 | 1993-12-21 | Schoofs Gregory R | Apparatus and method for air drying with reduced oxygen enrichment |
US5339644A (en) * | 1993-04-29 | 1994-08-23 | Singh Kanwal N | Defrost system for refrigeration apparatus |
-
1996
- 1996-09-16 EP EP96114834A patent/EP0805321B1/en not_active Expired - Lifetime
- 1996-09-16 AT AT96114834T patent/ATE210268T1/en not_active IP Right Cessation
- 1996-09-16 ES ES96114834T patent/ES2169187T3/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1659356A2 (en) | 2004-11-17 | 2006-05-24 | Liebherr-Hausgeräte Lienz GmbH | Refrigerator and/or freezing apparatus |
Also Published As
Publication number | Publication date |
---|---|
ES2169187T3 (en) | 2002-07-01 |
ATE210268T1 (en) | 2001-12-15 |
EP0805321A1 (en) | 1997-11-05 |
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