EP3088822B1 - Cooling appliance with pressure equalizing valve - Google Patents
Cooling appliance with pressure equalizing valve Download PDFInfo
- Publication number
- EP3088822B1 EP3088822B1 EP15165705.3A EP15165705A EP3088822B1 EP 3088822 B1 EP3088822 B1 EP 3088822B1 EP 15165705 A EP15165705 A EP 15165705A EP 3088822 B1 EP3088822 B1 EP 3088822B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cooling appliance
- permeable membrane
- semi permeable
- appliance according
- cabinet
- 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.)
- Not-in-force
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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
- F25D23/00—General constructional features
- F25D23/06—Walls
- F25D23/065—Details
- F25D23/068—Arrangements for circulating fluids through the insulating material
-
- 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
- F25D23/00—General constructional features
- F25D23/06—Walls
- F25D23/061—Walls with conduit means
Definitions
- the present inventions relates to a cooling appliance comprising a cabinet and a conduit traversing a wall of said cabinet and having pressure equalization means configured to avoid pressure differences between the inside to the cabinet and the outside.
- cooling appliance we deem any kind of domestic refrigerator, including freezers (either in form of cavities distinct from a fresh food compartment or in form of a chest freezer or vertical freezer).
- freezers either in form of cavities distinct from a fresh food compartment or in form of a chest freezer or vertical freezer.
- wall we mean either whatever wall of the cabinet or the door or lid thereof.
- valves may involve reliability problems since the movable part of such valves can by blocked and therefore does not provide the correct result, either by failing to avoid a pressure below atmospheric pressure in the cavity of the cabinet or by creating a free passage between the inside and the outside of the cabinet.
- known construction can be quite complex (involving the use of different components including springs or the like), and therefore they contribute to increase the overall cost of the domestic appliance.
- the traditional pressure equalization valve is replaced by a semi permeable membrane in the conduit.
- semi permeable membrane we mean a selectively permeable membrane, a partially permeable membrane or a differentially permeable membrane that will allow certain molecules to pass through it, particular oxygen and nitrogen, while other molecules, particular water vapor, are prevented from passing through it due to their bigger dimension.
- Semi permeable membranes can be polymeric membranes or ceramic membranes. Many polymeric materials can be used as semi permeable membrane for the use according to the present invention, and preferably they are selected in the group consisting of cellulose esters, cellulose acetate, nitrocellulose, polyether block amides, polysulfides, polymethylsiloxanes, polysulfones, polyether sulfone, polyacrilonitrile, polyamides, polyimides, polyethylene and polypropylene, polytetrafluoroethylene, polyvinylidene fluoride, and polyvinylchloride.
- the preferred material for the membrane is based on polyamides, cellulose esters, polyether block amides, polysulfides and polymethylsiloxanes.
- the membrane is generally supported on a rigid porous substrate having pores preferably from 0,1 and 1 ⁇ m.
- the polymeric membrane may be deposited as a thin layer on the substrate, or it may me polymerized and/or co-polymerized thereon ("in situ" polymerization).
- a chest freezer 10 presents an upper lid 10a with two conduits 12 which put into communication the inside of the cavity, indicated with the reference A, to the outside of the cavity, indicated with reference B.
- Each of the conduits 12 is provided with a semi permeable membrane 14.
- Figure 3 refers to a specific example used in the chest freezer 10 of figure 1 , where a corrugated flexible tube 18 is fastened, at one end, to a first flange 20 fixed to an inside wall 22 of the lid 10a and, at another end, to a second flange 24 nap-engaged or screwed onto a tubular plastic portion 26 which is mounted on a side wall 28 of the lid 10a and is provided with a seat 26a for the semi permeable membrane 14. Between the lid 10a and a side wall 11 of the freezer cabinet a rubber deformable gasket 13 is interposed.
- the membrane 14 is kept in the correct position by means of a cap 30 which is mounted on the end of the tubular plastic portion 26 by snap engagement or other similar system, assuring an air passage 32 towards the semi permeable membrane 14.
- This solution does not need any maintenance and does not undergo aging or wearing problem.
- insulation foam (not shown) is injected which also assures a fix position of the tube 18.
- the low pressure inside the cabinet prompts an air flow from the ambient (humid air indicated with arrows H in the figures).
- the semi permeable membrane blocks water vapor molecules so that an air dry flow is entering the cavity (such dry aid flow is indicated with arrows D in the figures).
- conduit is provided in the lid or in the door of the appliance, the same advantage can be obtained by placing the conduit across a wall of the refrigerator or freezer.
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)
- Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Description
- The present inventions relates to a cooling appliance comprising a cabinet and a conduit traversing a wall of said cabinet and having pressure equalization means configured to avoid pressure differences between the inside to the cabinet and the outside.
- With the term "cooling appliance" we deem any kind of domestic refrigerator, including freezers (either in form of cavities distinct from a fresh food compartment or in form of a chest freezer or vertical freezer). With the term "wall" we mean either whatever wall of the cabinet or the door or lid thereof.
- The above technical problem of pressure equalization has been solved by using a pressure equalizing valve as disclosed by
EP 2618081 and byKR2001047232 EP 2 520 882 A1 discloses a refrigerator according to the preamble of claim 1.DE 31 27 749 A1 andUS 2013/0105497 disclose pressure equalizing devices of the prior art. - The use of such known valves may involve reliability problems since the movable part of such valves can by blocked and therefore does not provide the correct result, either by failing to avoid a pressure below atmospheric pressure in the cavity of the cabinet or by creating a free passage between the inside and the outside of the cabinet. Moreover known construction can be quite complex (involving the use of different components including springs or the like), and therefore they contribute to increase the overall cost of the domestic appliance.
- It is an object of the present invention to provide a cooling appliance which does not present the above drawbacks. Such object is reached thanks to the feature listed in the appended claims.
- According to the invention, the traditional pressure equalization valve is replaced by a semi permeable membrane in the conduit. With the term semi permeable membrane we mean a selectively permeable membrane, a partially permeable membrane or a differentially permeable membrane that will allow certain molecules to pass through it, particular oxygen and nitrogen, while other molecules, particular water vapor, are prevented from passing through it due to their bigger dimension.
- During the opening and closing of the door of the cooling appliance and between a working cycle and the other subsequent cycle, air is sucked from the ambient towards the cavity with its load of humidity, which tends to condensate either as frost or liquid droplets. The use of a semi permeable membrane according to the invention allows pressure equalization and the passage of dry air towards the cavity which prevents any condensation of water vapor on the wall of the cavity.
- Semi permeable membranes can be polymeric membranes or ceramic membranes. Many polymeric materials can be used as semi permeable membrane for the use according to the present invention, and preferably they are selected in the group consisting of cellulose esters, cellulose acetate, nitrocellulose, polyether block amides, polysulfides, polymethylsiloxanes, polysulfones, polyether sulfone, polyacrilonitrile, polyamides, polyimides, polyethylene and polypropylene, polytetrafluoroethylene, polyvinylidene fluoride, and polyvinylchloride. The preferred material for the membrane is based on polyamides, cellulose esters, polyether block amides, polysulfides and polymethylsiloxanes.
- The membrane is generally supported on a rigid porous substrate having pores preferably from 0,1 and 1 µm. The polymeric membrane may be deposited as a thin layer on the substrate, or it may me polymerized and/or co-polymerized thereon ("in situ" polymerization).
- Further advantages and features according to the present invention will become clear from the following detailed drawings, provided by way of non limiting example, with reference to the attached drawings in which:
-
Figure 1 is a schematic section view of a chest freezer according to the invention; -
Figure 2 is a schematic section view of a vertical freezer according to the invention: -
Figure 3 is an enlarged view of a detail offigure 1 ; -
Figure 4 is a prospective view of the component used in the solution offigure 3 ; and -
Figure 5 is an exploded view of the component shown infigure 4 . - With reference to the drawings, a chest freezer 10 presents an upper lid 10a with two
conduits 12 which put into communication the inside of the cavity, indicated with the reference A, to the outside of the cavity, indicated with reference B. Each of theconduits 12 is provided with a semipermeable membrane 14. - A similar solution is disclosed with reference to a vertical freezer 16 (
figure 2 ), where theconduits 12 are still placed in a door 16a of the freezer. -
Figure 3 refers to a specific example used in the chest freezer 10 offigure 1 , where a corrugatedflexible tube 18 is fastened, at one end, to afirst flange 20 fixed to aninside wall 22 of the lid 10a and, at another end, to asecond flange 24 nap-engaged or screwed onto a tubularplastic portion 26 which is mounted on aside wall 28 of the lid 10a and is provided with a seat 26a for the semipermeable membrane 14. Between the lid 10a and a side wall 11 of the freezer cabinet a rubber deformable gasket 13 is interposed. Themembrane 14 is kept in the correct position by means of acap 30 which is mounted on the end of the tubularplastic portion 26 by snap engagement or other similar system, assuring anair passage 32 towards the semipermeable membrane 14. This solution does not need any maintenance and does not undergo aging or wearing problem. Of course around theflexible tube 18 insulation foam (not shown) is injected which also assures a fix position of thetube 18. - When the cooling appliance is working, the low pressure inside the cabinet prompts an air flow from the ambient (humid air indicated with arrows H in the figures). The semi permeable membrane blocks water vapor molecules so that an air dry flow is entering the cavity (such dry aid flow is indicated with arrows D in the figures).
- Even if in the above examples the conduit is provided in the lid or in the door of the appliance, the same advantage can be obtained by placing the conduit across a wall of the refrigerator or freezer.
Claims (7)
- Cooling appliance (10, 16) comprising a cabinet (11) and a conduit (12, 18) traversing a wall of said cabinet and having pressure equalization means configured to avoid pressure differences between the inside (A) of the cabinet and the outside (B), characterized in that such equalization means comprises a semi permeable membrane (14).
- Cooling appliance according to claim 1, wherein the semi permeable membrane (14) is placed at an end of the conduit (12, 18) on the ambient side thereof.
- Cooling appliance according to claim 2, wherein the semi permeable membrane (14) is protected by a removable cover (30).
- Cooling appliance according to any of the preceding claims, wherein the cooling appliance is a chest freezer (10) and the conduit (12) comprises a flexible pipe (18) located in the lid (10a) of the chest freezer (10).
- Cooling appliance according to claim 4, wherein the flexible pipe (18) is interposed between a first flange (20) fastened to a lower face (22) of the lid (10a) and a second flange (24) fastened to a tubular portion (26) mounted on a side wall (28) of the lid (10a), such tubular portion (26) having a seat (26a) for the semi permeable membrane (14).
- Cooling appliance according to any of the preceding claims, wherein the material of the semi permeable membrane (14) is selected in the group consisting of cellulose esters, cellulose acetate, nitrocellulose, polyether block amides, polysulfides, polymethylsiloxanes, polysulfone, polyether sulfone, polyacrilonitrile, polyamides, polyimides, polyethylene and polypropylene, polytetrafluoroethylene, polyvinylidene fluoride, and polyvinylchloride.
- Cooling appliance according to claim 6, wherein the material of the semi permeable material is selected in the group consisting of polyamides, cellulose esters, polyether block amides, polysulfides and polymethylsiloxanes.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP15165705.3A EP3088822B1 (en) | 2015-04-29 | 2015-04-29 | Cooling appliance with pressure equalizing valve |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP15165705.3A EP3088822B1 (en) | 2015-04-29 | 2015-04-29 | Cooling appliance with pressure equalizing valve |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3088822A1 EP3088822A1 (en) | 2016-11-02 |
EP3088822B1 true EP3088822B1 (en) | 2019-01-09 |
Family
ID=53008395
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15165705.3A Not-in-force EP3088822B1 (en) | 2015-04-29 | 2015-04-29 | Cooling appliance with pressure equalizing valve |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP3088822B1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106642907A (en) * | 2017-02-23 | 2017-05-10 | 合肥美菱股份有限公司 | Air pressure balance frost reducing device |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3127749A1 (en) * | 1981-07-14 | 1983-02-03 | Ley, Gerd, 5600 Wuppertal | Pressure-compensation arrangement for freezing devices |
IT1305711B1 (en) * | 1998-12-22 | 2001-05-15 | Merloni Elettrodomestici Spa | PRESSURE BALANCING VALVE WITHIN COLD REFRIGERATION UNITS EQUIPPED WITH PROTECTION FROM LOW TEMPERATURES |
KR100595433B1 (en) | 1999-11-18 | 2006-07-03 | 삼성전자주식회사 | Refrigerator and Control Method Thereof |
US20040031705A1 (en) * | 2002-06-17 | 2004-02-19 | Detemple Thomas E. | Atmospheric controlled container |
DE202006004828U1 (en) * | 2006-03-27 | 2006-06-08 | Hidde, Axel R., Dr. Ing. | Simple bleed valve with membrane |
CH701558A2 (en) * | 2009-07-31 | 2011-01-31 | Alex Knobel | Device and method for mixing and exchange of fluids. |
EP2520882B1 (en) * | 2011-05-02 | 2017-09-27 | Whirlpool Corporation | Freezer with a reduced frost formation |
KR101848926B1 (en) * | 2011-10-26 | 2018-05-29 | 엘지전자 주식회사 | Refrigerator |
ES2414293B1 (en) | 2012-01-17 | 2014-05-14 | Fagor, S.Coop. | Pressure balancing valve for a refrigerating apparatus and refrigerating apparatus incorporating said valve |
-
2015
- 2015-04-29 EP EP15165705.3A patent/EP3088822B1/en not_active Not-in-force
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
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EP3088822A1 (en) | 2016-11-02 |
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