EP2846116A1 - Refrigerator - Google Patents
Refrigerator Download PDFInfo
- Publication number
- EP2846116A1 EP2846116A1 EP13183553.0A EP13183553A EP2846116A1 EP 2846116 A1 EP2846116 A1 EP 2846116A1 EP 13183553 A EP13183553 A EP 13183553A EP 2846116 A1 EP2846116 A1 EP 2846116A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fins
- frost
- grid
- freezer
- compartment
- 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.)
- Granted
Links
- 230000008014 freezing Effects 0.000 claims abstract description 11
- 238000007710 freezing Methods 0.000 claims abstract description 11
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- 238000010257 thawing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 235000013611 frozen food Nutrition 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Images
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
- F25D21/06—Removing frost
-
- 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
- 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
- F25D2317/04—Treating air flowing to refrigeration compartments
- F25D2317/041—Treating air flowing to refrigeration compartments by purification
- F25D2317/0411—Treating air flowing to refrigeration compartments by purification by dehumidification
Definitions
- the present invention relates to a refrigerator comprising at least a freezing compartment closed by a door, and a member arranged to reduce the moisture content of the air.
- Such a refrigerator is known from EP 0644385 A1 which discloses a no-frost refrigerator comprising a freezing compartment, a closed storage compartment and a refrigerating circuit having an evaporator and circulating air to the above compartments.
- the member to reduce moisture content of the air is a partition wall arranged in the return air duct, such partition wall being provided with a heater for carrying out defrost phase.
- WO2009/141125A1 discloses a no frost refrigerator comprising a pre-defrost device which is arranged adjacent to the evaporator and has the same purpose of the partition wall of EP 0644385 , i.e. to have at least some humidity in the air guided by the pre-defrost device sticking to it.
- a solution for speeding up the process of manual defrosting of a direct cooled freezer, particularly a vertical freezer, is disclosed by DE29702740U in which the evaporator, where there is the main accumulation of frost, may be removed from the cavity thanks to automatic valves which avoid loosing refrigerant fluid. The evaporator is then cleaned manually (for instance by putting it under tap water).
- Such solution is quite complex and expensive and does not guarantee that a lack of refrigerant fluid may occur in the process of removing and then re-installing the evaporator grid.
- a metal grid made of one (single plate) or more (fins) metal surfaces supported by a frame is placed on the top part of a freezer compartment: in this way when the door is opened, most of the external humid air enters in contact with it.
- the grid is not the coldest part of the freezer (by definition, the coldest part is the evaporator) but it is cold enough to have part of humidity stuck to its surface.
- the metal grid has to be periodically cleaned by the user, but this operation is much easier because the grid can be easily removed and then cleaned with tap water. The grid is then replaced inside freezer and the same grid can be reused every time. In this way frost formation on the freezer walls is slower. As a consequence, the complex manual defrost operation can be done less frequently.
- the grid is a simple mechanical component and it does not require electrical connections and/or electronic control.
- the flat element presents a plurality of parallel fins arranged transversally to the front opening of the compartment.
- a direct cooled double door refrigerator having an upper fresh food compartment 10a and a lower freezer compartment 10b.
- the freezer compartment 10b is provided with two drawers 12 and a sliding shelf 14.
- a flat grid 18 ( figures 2 , 3) comprising a plurality of parallel slanted fins 18a connected together by longitudinal beams 20 ( figure 3 ).
- the fins 18a are placed transversally with reference to the direction of the opening of the compartment.
- the ends of each beam 20 are connected to a front piece 22 and to a rear piece 24 respectively, so as to form a single piece grid.
- the front piece 22 is provided centrally with an aperture 22a defining a handle for easily removing and mounting the grid 18 over rails (not shown) defined in the side walls of the liner.
- the applicant has tested different kinds of fins pattern; figure 4 shows a pattern ("A") in which the fins 18a are inclined in a direction different from the direction shown in figure 5 (pattern "B").
- Figure 6 shows a different arrangement of the grid 18 which is slanted of about 20° to 35° with respect to the horizontal arrangement shown in figures 4 and 5 (in the example of figure 6 the fins 18a are oriented according to pattern "B", but also the pattern "A" was tested by the applicant).
- the 20 fins used on CB310 have a width of about 350 mm, while the 14 fins tested on CB304 have a width of 300 mm.
- the width of the grid 18 may vary, and it depends mainly on the dimension of the compartment. As far as the material of the grid 18 is concerned, it is only important that the material has a high thermal conductivity, for instance aluminum or stainless steel.
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)
Abstract
Description
- The present invention relates to a refrigerator comprising at least a freezing compartment closed by a door, and a member arranged to reduce the moisture content of the air.
- Such a refrigerator is known from
EP 0644385 A1 which discloses a no-frost refrigerator comprising a freezing compartment, a closed storage compartment and a refrigerating circuit having an evaporator and circulating air to the above compartments. In such known solution the member to reduce moisture content of the air is a partition wall arranged in the return air duct, such partition wall being provided with a heater for carrying out defrost phase. -
WO2009/141125A1 discloses a no frost refrigerator comprising a pre-defrost device which is arranged adjacent to the evaporator and has the same purpose of the partition wall ofEP 0644385 , i.e. to have at least some humidity in the air guided by the pre-defrost device sticking to it. - The above solutions are designed for use in no-frost refrigerators, where the main quantity of frost is accumulated on the evaporator put in the air flow circuit. Therefore the benefit of having these added elements on which some frost is accumulated is quite limited. Moreover, for removing frost from such accumulation surface it is necessary to have an auxiliary heater, which increases the whole cost and complexity of the appliance.
- In a direct cooled freezer, internal air is colder and therefore denser than external air. So, every time the door is opened, part of the cold dry air inside falls out (most from the lower part of the freezer) and it is replaced by external warmer and more humid air, that enters mainly on the upper part of the freezer liner. Humidity enters and remains stuck to freezer cold walls, forming a layer of frost. Frost has to be periodically manually removed by the user: this operation is quite complex because it requires switching off the appliance, removing frozen food and storing it somewhere else, wait some time for the ice to melt into water, remove water, etc.
- Most direct cooled freezers do not have any device to slow down frost formation or to speed up frost removal operation. Existing solutions are (apart from "no frost" refrigerators mentioned above) low frost external flexible bags: they reduce external air inlet when freezer door is closed. Drawback is the need of external space, so this solution is used mainly for chest freezers. Another solution is to use silica gel bags inside freezer. Such bags collect humidity that enters into freezer compartment. Drawback is that this material has to be replaced periodically; furthermore it is toxic and in case of disposal it requires special treatment. Another known solution is to use a sort of frost cup that collects frost that enters when door is closed; frost is then periodically manually removed by the user by removing and cleaning the cup. Drawback is that the system requires an electrical heater that keeps air duct clean from ice: therefore it requires electrical connections and electronic control.
- A solution for speeding up the process of manual defrosting of a direct cooled freezer, particularly a vertical freezer, is disclosed by
DE29702740U in which the evaporator, where there is the main accumulation of frost, may be removed from the cavity thanks to automatic valves which avoid loosing refrigerant fluid. The evaporator is then cleaned manually (for instance by putting it under tap water). Such solution is quite complex and expensive and does not guarantee that a lack of refrigerant fluid may occur in the process of removing and then re-installing the evaporator grid. - It's an object of the present invention to provide a refrigerator of the kind specified at the beginning of the description, and particularly a direct cooled vertical freezer or a refrigerator comprising such freezing compartment, with a solution for avoiding a too frequent manual defrosting of the cavity and evaporator.
- Such object is reached thanks to the features listed in the appended claims.
- According to one aspect of the invention, a metal grid made of one (single plate) or more (fins) metal surfaces supported by a frame is placed on the top part of a freezer compartment: in this way when the door is opened, most of the external humid air enters in contact with it. Of course the grid is not the coldest part of the freezer (by definition, the coldest part is the evaporator) but it is cold enough to have part of humidity stuck to its surface. Also the metal grid has to be periodically cleaned by the user, but this operation is much easier because the grid can be easily removed and then cleaned with tap water. The grid is then replaced inside freezer and the same grid can be reused every time. In this way frost formation on the freezer walls is slower. As a consequence, the complex manual defrost operation can be done less frequently. The grid is a simple mechanical component and it does not require electrical connections and/or electronic control.
- By placing the flat element or grid substantially horizontal within the freezer compartment, a value of up to 20% of the total frost is accumulated on the grid only, a quite surprising value indeed particularly because the total surface of the grid is much less that 20% of the total surfaces of the freezer compartment. The applicant believes that this surprising value is due to the pattern of air flow when the door is opened, the outside air impinging the flat element first.
- According to another preferred feature of the invention, the flat element presents a plurality of parallel fins arranged transversally to the front opening of the compartment. Further advantages and features of the solution according to the present invention will be clear from the following detailed description, provided by way of non-limiting example, with reference to the attached drawings in which:
-
Figure 1 is a cross-section view of a refrigerator according to the present invention; -
Figure 2 is an enlarged prospective view of a component offigure 1 ; -
Figure 3 is plan enlarged view of the component offigure 2 -
Figure 4 is a a cross section of an upper part of the freezing compartment offigure 1 according to a first embodiment; -
Figure 5 is a view similar tofigure 4 according to a second embodiment; and -
Figure 6 is a view similar tofigures 3 and4 according to a third embodiment. - With reference to the drawings, with 10 it is indicated a direct cooled double door refrigerator having an upper fresh food compartment 10a and a
lower freezer compartment 10b. In the example offigure 1 , thefreezer compartment 10b is provided with twodrawers 12 and asliding shelf 14. Close to the ceiling of the compartment, indicated withreference 16 in the drawings, it is placed a flat grid 18 (figures 2 ,3) comprising a plurality of parallel slanted fins 18a connected together by longitudinal beams 20 (figure 3 ). The fins 18a are placed transversally with reference to the direction of the opening of the compartment. The ends of eachbeam 20 are connected to afront piece 22 and to arear piece 24 respectively, so as to form a single piece grid. Thefront piece 22 is provided centrally with anaperture 22a defining a handle for easily removing and mounting thegrid 18 over rails (not shown) defined in the side walls of the liner. The applicant has tested different kinds of fins pattern;figure 4 shows a pattern ("A") in which the fins 18a are inclined in a direction different from the direction shown infigure 5 (pattern "B"). -
Figure 6 shows a different arrangement of thegrid 18 which is slanted of about 20° to 35° with respect to the horizontal arrangement shown infigures 4 and 5 (in the example offigure 6 the fins 18a are oriented according to pattern "B", but also the pattern "A" was tested by the applicant). - The results of the tests carried out by the applicant on two different commercial double doors refrigerators (CB310 and CB304) have given the following results in terms of quantity of frost accumulated on the
grid 18 and on other parts of the compartment, particularly top surface (ceiling of the cavity), drawers, shelves and other surfaces.Product 1- CB310 - With Drawers 20 fins/horizontal /A 20 fins / horizontal / B 20 fins / inclined / B 20 fins / inclined / A Top Surface 10% 13% 15% 18% Other Surfaces 34% 32% 36% 33% Grid 1820% 19% 19% 19% Drawers + Shelves 35% 36% 31% 30% Product 2 - CB304 - With Drawers 14 fins / inclined / B 14 fins / inclined /A 14 fins /horizontal /A 14 fins / horizontal /B Top Surface 16% 18% 24% 23% Other Surfaces 39% 34% 30% 27% Grid 1812% 10% 12% 15% Drawers + Shelves 33% 37% 34% 35% - The 20 fins used on CB310 have a width of about 350 mm, while the 14 fins tested on CB304 have a width of 300 mm.
- Best results in terms of frost accumulation have been obtained by using 20 fins 18a with a width of 350 mm, positioned horizontally in the
freezing compartment 10b. The influence of pattern "A" or "B" (inclination of fins) is quite low and therefore the arrangement of such fins can be chosen depending on other considerations. - Of course other number of fins 18a can be chosen, and good results may be obtained by using fins in the range from 10 to 30. Also the width of the
grid 18 may vary, and it depends mainly on the dimension of the compartment. As far as the material of thegrid 18 is concerned, it is only important that the material has a high thermal conductivity, for instance aluminum or stainless steel. - A way for moving from the present long and annoying defrost profess for direct cooled freezer to a simple and faster one have been described, in which a very simple mechanical piece (metal grid with fins) acts as a humidity collection "catalyst" to collect a relevant part of humidity inside the inner-liner of the cavity. Such piece is easy to remove, to clean and to reposition in the freezer.
- Of course even if the subject-matter of the invention has been described in details with reference to a double door refrigerators, it can be used as well also in other kinds of refrigeration appliances, for instance side by side refrigerators.
Claims (6)
- A refrigerator comprising a freezing compartment (10b) closed by a door, and a member adapted to reduce the moisture content of air, characterized in that said member is a flat member (18) placed adjacent the top (16) of the freezing compartment (10b) and adapted to be removed by the user for eliminating frost.
- A refrigerator according to claim 1, wherein the flat element (18) is positioned horizontally within the freezing compartment (10b).
- S refrigerator according to claim 1, wherein the flat element (18) is positioned inclined within the freezing compartment (10b).
- A refrigerator according to any of the preceding claims, wherein the flat element (18) presents a plurality of fins (18a) arranged transversally to the opening of the compartment (10b).
- A refrigerator according to claim 4, wherein the fins (18a) are parallel and inclined with reference to the flat element (18).
- A refrigerator according to claim 4 or 5, wherein the fins (18a) are comprised in a number between 10 and 30.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP13183553.0A EP2846116B1 (en) | 2013-09-09 | 2013-09-09 | Refrigerator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP13183553.0A EP2846116B1 (en) | 2013-09-09 | 2013-09-09 | Refrigerator |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2846116A1 true EP2846116A1 (en) | 2015-03-11 |
EP2846116B1 EP2846116B1 (en) | 2021-02-17 |
Family
ID=49118399
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13183553.0A Active EP2846116B1 (en) | 2013-09-09 | 2013-09-09 | Refrigerator |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP2846116B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017000948A1 (en) | 2016-11-04 | 2018-05-09 | Liebherr-Hausgeräte Ochsenhausen GmbH | Fridge and / or freezer |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2442978A (en) * | 1944-03-17 | 1948-06-08 | Philco Corp | Refrigeration apparatus having frost localizing means |
US3008306A (en) * | 1959-05-01 | 1961-11-14 | Ohio Commw Eng Co | Apparatus for defrosting refrigerators |
EP0031311A2 (en) * | 1979-11-29 | 1981-07-01 | Aktiebolaget Electrolux | Arrangement for keeping a freezer frost-free |
EP0644385A1 (en) | 1993-09-04 | 1995-03-22 | Daewoo Electronics Co., Ltd | System for reducing frost in a refrigerator |
DE29702740U1 (en) | 1997-02-17 | 1997-04-24 | Kauder, Peter K., 56567 Neuwied | Freezer, with individually removable freezer shelves, for energy-saving defrosting with a handle and drip-proof valves / couplings |
US20050061015A1 (en) * | 2003-09-19 | 2005-03-24 | Ingley Herbert A. | System for trapping airborne water in cooling and freezing devices |
WO2009141125A1 (en) | 2008-05-23 | 2009-11-26 | Aktiebolaget Electrolux (Publ) | Cold appliance |
-
2013
- 2013-09-09 EP EP13183553.0A patent/EP2846116B1/en active Active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2442978A (en) * | 1944-03-17 | 1948-06-08 | Philco Corp | Refrigeration apparatus having frost localizing means |
US3008306A (en) * | 1959-05-01 | 1961-11-14 | Ohio Commw Eng Co | Apparatus for defrosting refrigerators |
EP0031311A2 (en) * | 1979-11-29 | 1981-07-01 | Aktiebolaget Electrolux | Arrangement for keeping a freezer frost-free |
EP0644385A1 (en) | 1993-09-04 | 1995-03-22 | Daewoo Electronics Co., Ltd | System for reducing frost in a refrigerator |
DE29702740U1 (en) | 1997-02-17 | 1997-04-24 | Kauder, Peter K., 56567 Neuwied | Freezer, with individually removable freezer shelves, for energy-saving defrosting with a handle and drip-proof valves / couplings |
US20050061015A1 (en) * | 2003-09-19 | 2005-03-24 | Ingley Herbert A. | System for trapping airborne water in cooling and freezing devices |
WO2009141125A1 (en) | 2008-05-23 | 2009-11-26 | Aktiebolaget Electrolux (Publ) | Cold appliance |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017000948A1 (en) | 2016-11-04 | 2018-05-09 | Liebherr-Hausgeräte Ochsenhausen GmbH | Fridge and / or freezer |
Also Published As
Publication number | Publication date |
---|---|
EP2846116B1 (en) | 2021-02-17 |
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