EP1686880A1 - Device for heating foodstuff with hot air - Google Patents
Device for heating foodstuff with hot airInfo
- Publication number
- EP1686880A1 EP1686880A1 EP03770838A EP03770838A EP1686880A1 EP 1686880 A1 EP1686880 A1 EP 1686880A1 EP 03770838 A EP03770838 A EP 03770838A EP 03770838 A EP03770838 A EP 03770838A EP 1686880 A1 EP1686880 A1 EP 1686880A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- oven
- receptacle
- container
- hot air
- heating
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/32—Arrangements of ducts for hot gases, e.g. in or around baking ovens
- F24C15/322—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation
Definitions
- the present invention relates to an oven for heating foodstuff, in particular french fries, by means of hot air circulating in a substantially closed circle, wherein circulation of the air is forced, preferably by a fan or a blower. It in particular relates to an oven which is suited for heating individual portions or a small number of portions within a very short amount of time.
- french fries are prepared using a bath of hot oil, which leads on the one hand to a crispy surface of the french fries and which and the other hand reduces the moisture within the french fries to the desirable amount.
- the french fries may be provided as raw potato sticks, but may also be provided as precooked potato sticks.
- Such cooking of french fries has a number of drawbacks, one of which being that the heating of the bath of hot oil requires substantial energy and time and in particular if not used regularly, the storage of such a bath of oil is problematic. Furthermore, such a bath of hot oil gives rise to fumes, which have to be eliminated by means of expensive ventilation etc. Additionally, such a bath of hot oil has to be exchanged regularly, so only if used intensely and regularly, keeping of such a bath is economic and at the same time leads to high-quality french fries.
- US 5,690,018 disclosing an oven using heat radiation.
- US 5,445,073 discloses an oven in which the french fries are heated by a stream of hot air which is guided through the french fries from the bottom and at least partially lifts and moves the french fries during the heating process.
- WO 97/37575 discloses an oven in which the stream of hot air moves the french fries, but in this case the movement is additionally supported by a vibration of the container in which the french fries are stored.
- the objective problem underlying the present invention is therefore to provide an improved device for heating foodstuff, in particular french fries or some other foodstuff being formed of a limited number of individual pieces or parts. So apart from french fries also spring rolls, potato croquettes and the like shall be heatable by such device.
- the present invention relates to the improvement of an oven for heating foodstuff, in particular french fries, by means of hot air circulating in a substantially closed circle, wherein circulation of the air is forced, preferably by a fan or a blower.
- the present invention solves the above problem in that the foodstuff is contained in at least one receptacle at least one or two of the walls of which is at least partially penetrable to the circulating hot air, in that the receptacle is at least partially enclosed towards its penetrable wall(s) by walls of a container, wherein there is a spacing between the respective walls of the receptacle and the walls of the container, and in that hot air is entering the receptacle and/or the container substantially from an upper side.
- the side wall of the container is inclined with respect to a horizontal plane by a first angle ⁇ and a corresponding penetrable side wall of the receptacle is inclined with respect to said horizontal plane by a second angle ⁇ , wherein the first angle is smaller than 90° and larger than the second angle ⁇ .
- the object of the present invention is therefore a device according to claim 1, as well as a method according to claim 30.
- the key feature of the invention is therefore the fact that hot air is entering the region in which the foodstuff is to be heated from an upper side, impinges onto the tilted side wall of the container, the tilt angle of which is smaller than 90°, and is thus deviated into the receptacle through the penetrable tilted side wall of the receptacle correspondingly being guided through the foodstuff kept in the receptacle. Due to the fact that the tilt angles ⁇ and ⁇ are different from each other, and due to the fact that is larger than ⁇ , there is provided a region between the receptacle and the container which opens up towards the bottom of the container and/or the receptacle.
- the air may enter the interior of the container either directly into the space between the tilted side wall of the receptacle and the tilted side wall of the container, but it is also possible that at least partially the hot air enters the container by first passing through a part of the tilted side wall of the receptacle and subsequently flowing into the space between the tilted side wall of the receptacle and the tilted side wall of the container. Preferentially, an (imagined) intersection line between the tilted side wall of the receptacle and the tilted side wall of the container is aligned substantially horizontally.
- the receptacle as well as the container is of elongate shape, i.e.
- lateral side walls on the upper side of the receptacle are longer than the tilted sides and a side opposite to the tilted side.
- the hot air entering the receptacle and/or the container first enters in the region of the space between the two tilted walls, passes through the receptacle and the foodstuff contained therein, and then exits towards the upper side of the receptacle back into a heating section of the oven. So in case of an elongate receptacle, the hot air enters from the top on one side in a substantially vertical direction then turns around, passes the foodstuff, and is diverted upside again to exit the receptacle in a substantially vertical direction. A closed circle of the air can thus be provided, and smelly fumes can be avoided.
- the oven according to the invention is characterised in that hot air is entering the receptacle and/or the container substantially from a vertical direction perpendicular to said horizontal plane, and preferentially that after having entered and passed through the foodstuff the air exits the receptacle and/or the container again towards the upper side, preferentially in a vertical direction.
- the device is characterised in that said first angle ⁇ is about twice as large as said second angle ⁇ . Typically, the first angle ⁇ is smaller than 80°, preferentially smaller than 75°, even more preferentially in a range between 70 and 60°.
- the second angle ⁇ can be chosen to be smaller than 50 °, preferentially smaller than 45°, even more preferentially in a range between 40 and 30°.
- Another preferred embodiment of the present invention is characterised in that the receptacle has an opening towards its upper side, and in that preferentially all the side walls as well as the bottom wall are penetrable to the hot air. If these side walls are well spaced from the walls of the container, a very efficient flow and distribution of hot air is allowed, thus leading to a very efficient and homogeneous heating process.
- the receptacle has walls made of a grid or mesh, preferentially made of metal, wherein preferentially there is a horizontal bottom grid, a vertical backside grid and two vertical side grids aligned substantially parallel to each other, as well as a tilted front grid.
- the walls can be made of perforated material like perforated metal plates.
- the receptacle furthermore comprises a horizontal grid portion adjacent to the tilted front grid substantially in the plane of the opening towards the upper side of the receptacle. This horizontal grid portion is then first penetrated prior to entering the region between the two tilted walls.
- the bottom wall of the container is preferentially spaced from the bottom grid of the receptacle by e.g. 1 centimetre.
- This nose or protrusion is preferentially made of the same material as the side walls of the receptacle, i.e. may be an extension made of metal grid or the like.
- the container comprises a horizontal bottom wall, a vertical backside wall and two vertical side walls aligned substantially parallel to each other, as well as a tilted front wall, all of which are not penetrable to the hot air and which are preferentially made of coated or uncoated metal, but also syntlietic material like heat-resistant plastic or the like is possible.
- a slidable insert into which the receptacle is inserted, and which can be shifted into the oven and thus into the stream of hot air of the oven.
- the slidable insert into which the container is removably incorporated is drawn out of the oven, the receptacle filled with foodstuff is inserted into the container from the top and thus into this part of the insert, and the whole insert is subsequently shifted back into the main body of the oven, thus moving it into the circulating hot air.
- the container can be taken out of the insert and cleaned separately.
- heating of the air takes place in a heating cavity located upstream of the fan.
- Heating elements like heating coils may be provided in this heating cavity, either directly or in particular compartments such that transfer of heat only takes place along walls.
- the unit for heating as well, as actuating the air is located above the compartments, in which the receptacle and the container are located.
- filtering means for the air.
- These filtering means may be perforated or mesh- like structures made of metal or synthetic material, preferably additionally retaining condensed water present in the circulating hot air.
- the filtering means can be a semi- permeable membrane permeable to air and steam but impermeable to condensed water. Possible is for example a GoreTex ® membrane.
- the receptacle may be designed to have a volume in the range of 1 - 2 litres. Preferably the volume for taking up pre-fried or precooked convenience food amounts to about 1.7 litres. Generally speaking, the receptacle is designed to take up one portion or several portions of the foodstuff, wherein typically one portion of pre-fried French fries amounts to normally less than about 400 g and may e.g. be in the range of 80 - 150 g. For other convenience food (e.g. rosti, spring rolls) also portions of up to 700 g may be heated in such a receptacle, whereby longer heating times may have to be put off with. Such a receptacle for one portion can be heated up ready to eat in a time-span in the range of or less than one minute.
- the present invention furthermore relates to a method for heating foodstuff by means of hot air in a substantially closed circle, preferably using an oven as described above.
- the method is preferentially characterised in that the circulating hot air is heated to a temperature in the range of 180-250° C, preferentially heating a portion of french fries within a time-span in the range of one minute.
- the foodstuff is not substantially moving within the receptacle, thus avoiding (partial) destruction of the foodstuff.
- Particularly easy operation is made possible if the heating process is initiated after having read a barcode e.g. provided on the package of the foodstuff to be heated, preferentially indicating particular heating conditions adapted to the foodstuff contained in the package.
- figure 1 shows a schematic cut through an oven according to a preferred embodiment of the invention
- figure 2 shows detailed perspective views of individual elements of an oven according to a preferred embodiment of the invention, wherein a) shows the basket for the foodstuff, b) the container for taking up the basket, c) the sliding insert for moving the foodstuff into the oven, e) the housing part as well as the upper part of the oven without covering elements
- figure 3 shows a schematic cut through an oven according to a preferred embodiment of the invention indicating the circulating flow of air.
- figure 1 shows a schematic cut through an oven 1 according to a first preferred embodiment of the present invention.
- the direction of the cut is parallel to the front side of the oven 1.
- the oven 1 comprises an upper part, in which the heating cavity 8 as well as the means for the propulsion of the stream of air is located. Propulsion of the air is achieved by a fan 20, which is located in a housing 7.
- the fan 20 is energised by a motor 6.
- Such a motor normally has a power in the range of 195 Watt leading to an effective circulation of air of about 200m 3 /h at a static pressure of 500 Pa. In conjunction with the regulated air temperature at the exit of the blower of in the range of 195 to 205 °C this leads to heating of the food within about 2 minutes. If the machine is to be designed in other dimensions for example for taking up more portions, the power as well as the circulation have to be scaled up accordingly.
- the axis of the motor is arranged parallel to the front side of the oven.
- a container 4 which comprises a tilted front wall 4a on the fan side of the oven, a bottom wall 4b, two lateral side walls 4c parallel to the front side of the oven, and one backside wall 4d.
- the bottom wall 4b is arranged horizontally, and the tilted wall 4a encloses an angle ⁇ with the horizontal plane which is different from 90°. In this particular case the angle ⁇ is 66°.
- the lateral side walls 4c and the backside wall 4d there is provided salient horizontal borders 4e, allowing to fix or hold the container 4 within an insert.
- the walls of the container are made of a heat resistant material, like for example metal, coated metal, heat resistant polymeric materials, etc. In this particular embodiment, LNOX was chosen as the material for the walls of the container 4.
- the basket 2 comprises a tilted front wall 2a on the fan side of the oven, a bottom wall 2b, two lateral side walls 2c parallel to the front side of the oven, and one backside wall 2d.
- the bottom wall 2b is arranged horizontally, and the tilted wall 2a encloses an angle ⁇ with the horizontal plane which is different from 90° and in any case smaller than the above-mentioned angle ⁇ of the container 4. In this particular case the angle ⁇ is 35 °.
- the walls of the basket 2 are all permeable to air, and are made of a grid of metal wires (INOX) with a thickness of 0.8 mm, and with a spacing of 8 x 8 mm.
- INOX metal wires
- the basket 2 furthermore comprises a nose 26, which makes sure that the basket 2, if inserted into the container 4 does not touch the bottom of the container, i.e. that there remains an empty space 13 between the two bottom walls 2b and 4b.
- This empty space 13 furthermore improves homogeneous and efficient circulation of the air around the basket and homogeneous entry into the basket and through the foodstuff located in the basket.
- Arrows indicate the dimensions chosen for individual parts of the oven 1, so the length a of the heating cavity 8 is 205 mm, the height b of the heating cavity is 145 mm, the width d of the channel " for entry of air into the heating cavity 8 is 130 millimetre, the height e of the housing for the fan is 265 mm, the width f of this housing is 106 nim, and the width g of the room for the motor is 130mm.
- the two tilted walls 2a and 4a are not arranged adjacent to each other, but there remains a spacing in the top region. In this spacing there is provided a horizontal grid portion 3 of the basket 2, such that if hot air is entering from the top in this region, it passes this horizontal grid portion.
- FIG 2a shows the basket 2. It can be seen, that there is provided a handle 14, made of a bent thick metal wire, and which, if the basket 2 is. inserted into the container 4 and into the insert 16 in the oven 1 sticks out of the oven. It allows easy handling of the basket for filling it with foodstuff and inserting and removing the basket into and from the oven. It may be slightly bent downwards to facilitate handling, and extends approximately 15 to 20 cm away from the edge of the basket 2.
- the basket has a depth of 90 mm, and if for the angle ⁇ a value of 35° is chosen, the bottom part of the basket has a length of 60 mm.
- the basket furthermore has a height of 140mm and a length at its top edge of 160 mm.
- the horizontal grid portion 3 has a length of approximately 35mm.
- Figure 2b shows the container 4 if removed from the insert 16.
- Figure 2c shows the insert 16, which comprises a front wall of or front plate 18 as well as two lateral track rails 17 as means for easy shifting of the insert into and out of the oven 1. It furthermore comprises an opening 19 on the top, adapted to take up the container 4 such that its border 4e comes to lie on top of the edge portion of the insert 16 thus supporting the container 4 in the insert 16.
- the lateral side walls 4c of the container are spaced from each other by 92mm (depth), the height of the container is 155mm and its length on the bottom side is 230 mm.
- the opening on the top has a size of 298 x 92 mm.
- the angle ⁇ is chosen to be 66°.
- the border 4e has a width of approximately 10-15 mm.
- Figure 2 d shows a view of the lower housing of the oven and as well as of the top parts of it.
- a basically rectangular box into which the insert 16 fits and can be shifted into and out of by means of movable rails 15.
- the heating cavity on the left side is provided with an opening 9 for entry of the air having passed the foodstuff region into the heating cavity 8.
- the housing 7 for the fan 20 is provided on the right side of the top portion of the oven 1 adapted to take in the air from the heating cavity 8 and to blow it into the lower part via an exit 11.
- FIG 3 shows the principal air flows in an oven according to another preferred embodiment.
- the hot air gets heated by means of heating elements 21 along which or through which the hot air is flowing.
- the surface of these heating elements may have temperatures of about 500° C, while the heating elements 21 are regulated to give rise to a temperature of the air in the range of 200°C. This choice was found to lead to an optimal heating of the foodstuff, but also for user safety reasons higher temperatures should be avoided.
- the heating element 21 immediately downstream of the receptacle is adjusted to have a high surface temperature in the range of 500° C such as to ensure burning (pyrolysis) of grease components present in the circulating hot air and to keep them away from the blower 20.
- This heating element correspondingly partially acts as a filter.
- the heating elements 21 can be provided on the entrance side as well as on the exit side of the heating cavity 8 or both. Downstream of the heating cavity 8 there is located the fan 20, which blows the hot air 22 through a filter 25.
- the length k of this opening for the filter 25 is approximately 70 mm.
- the hot air enters the region of the foodstuff 28 on the right side of the basket 2 and/or of the container 4 and partially flows around the basket 2 entering it through all the permeable walls 2a-2d from all sides. It subsequently exits as colder air 23 the region of the foodstuff vertically in another direction, first passes a second filter 24 and then enters the heating cavity 8.
- the length h of the second filter 24 is 127 mm.
- the filters 25 and 24 can be metal wire meshes, wherein the metal wires (INOX) have a thickness of 0.5 mm and are spaced from each other by 1.5 mm.
- INOX metal wires
- filters can be substituted or supplemented by filters additionally eliminating condensed water from the circulating hot air. This is for example possible by filters with semi-permeable membranes made of polytefrafluoroethylene, like e.g. available under the trade name GoreTex ® . LIST OF REFERENCE NUMERALS
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SI200331498T SI1686880T1 (en) | 2003-11-21 | 2003-11-21 | Device for heating foodstuff with hot air |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/CH2003/000771 WO2005048796A1 (en) | 2003-11-21 | 2003-11-21 | Device for heating foodstuff with hot air |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1686880A1 true EP1686880A1 (en) | 2006-08-09 |
EP1686880B1 EP1686880B1 (en) | 2008-11-05 |
Family
ID=34596912
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03770838A Expired - Lifetime EP1686880B1 (en) | 2003-11-21 | 2003-11-21 | Device for heating foodstuff with hot air |
Country Status (11)
Country | Link |
---|---|
US (1) | US20070125354A1 (en) |
EP (1) | EP1686880B1 (en) |
AT (1) | ATE413128T1 (en) |
AU (1) | AU2003280273A1 (en) |
CA (1) | CA2547789A1 (en) |
DE (1) | DE60324612D1 (en) |
DK (1) | DK1686880T3 (en) |
ES (1) | ES2316832T3 (en) |
PT (1) | PT1686880E (en) |
SI (1) | SI1686880T1 (en) |
WO (1) | WO2005048796A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1867264A1 (en) * | 2006-06-16 | 2007-12-19 | Kavaring Cooking Systems B.V. i.o. | Apparatus for preparing food |
GB2449213B (en) | 2007-05-18 | 2011-06-29 | Kraft Foods R & D Inc | Improvements in or relating to beverage preparation machines and beverage cartridges |
DE102008026907A1 (en) * | 2008-06-05 | 2009-12-10 | Rational Ag | Food arranging equipment for cooking chamber of cooking device, has condensate discharging device including cover for covering opening of container, where cover is permeable to hot-air, steam and/or microwaves and impermeable to condensate |
ITVI20090174A1 (en) * | 2009-07-14 | 2011-01-15 | Giovanni Magnabosco | CLEANING, CLEANING AND SANITIZATION SYSTEM FOR CONTAINERS AND APPLIANCES USED IN FOOD PROCESSING |
EP3003104B1 (en) | 2013-06-04 | 2019-09-18 | Koninklijke Philips N.V. | Air-based fryer |
EP3003106B1 (en) | 2013-06-04 | 2019-10-02 | Koninklijke Philips N.V. | Air fryer |
CN113633193B (en) * | 2021-09-08 | 2023-01-31 | 广东美的厨房电器制造有限公司 | Shell assembly and cooking utensil with same |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4865864A (en) * | 1985-03-27 | 1989-09-12 | Rijswijck Willem V | Air heated oven and heating method |
US4961849A (en) * | 1988-12-19 | 1990-10-09 | Hull Harold L | Magnetically attached filter |
US5445073A (en) | 1992-04-14 | 1995-08-29 | Gilwood; William C. | Apparatus and process for cooking potatoes |
DK171668B1 (en) | 1993-11-19 | 1997-03-10 | Ejner Bjoern Hansen | Apparatus for heat treatment of a particulate food product |
US5533444A (en) * | 1994-01-07 | 1996-07-09 | Food And Agrosystems, Inc. | High air velocity convection oven |
EP0764257A4 (en) * | 1994-05-25 | 1999-06-23 | Ultravection International Inc | Convectively-enhanced radiant heat oven |
JP3082574B2 (en) * | 1994-07-25 | 2000-08-28 | 株式会社日立製作所 | Gas insulated switchgear |
DE4436035A1 (en) * | 1994-10-10 | 1996-04-25 | Ubert Gastrotechnik Gmbh | Process for the preparation of food in a hot air oven |
NL1002813C2 (en) | 1996-04-09 | 1997-10-14 | Hoverdale N V | Oven and method for preparing a foodstuff in such an oven. |
US5762667A (en) * | 1996-06-11 | 1998-06-09 | Amway Corporation | Air treatment system |
US5970853A (en) * | 1998-05-14 | 1999-10-26 | Liberty Food Service Equipment, Inc. | Food cooking assembly, restaurant system, and restaurant methods |
CA2279957A1 (en) * | 1999-08-09 | 2001-02-09 | Speed Fry Corporation | Apparatus and method for automatically frying foodstuff |
-
2003
- 2003-11-21 US US10/595,893 patent/US20070125354A1/en not_active Abandoned
- 2003-11-21 AT AT03770838T patent/ATE413128T1/en not_active IP Right Cessation
- 2003-11-21 AU AU2003280273A patent/AU2003280273A1/en not_active Abandoned
- 2003-11-21 SI SI200331498T patent/SI1686880T1/en unknown
- 2003-11-21 EP EP03770838A patent/EP1686880B1/en not_active Expired - Lifetime
- 2003-11-21 DK DK03770838T patent/DK1686880T3/en active
- 2003-11-21 PT PT03770838T patent/PT1686880E/en unknown
- 2003-11-21 ES ES03770838T patent/ES2316832T3/en not_active Expired - Lifetime
- 2003-11-21 WO PCT/CH2003/000771 patent/WO2005048796A1/en active Application Filing
- 2003-11-21 CA CA002547789A patent/CA2547789A1/en not_active Abandoned
- 2003-11-21 DE DE60324612T patent/DE60324612D1/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2005048796A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1686880B1 (en) | 2008-11-05 |
SI1686880T1 (en) | 2009-04-30 |
ATE413128T1 (en) | 2008-11-15 |
ES2316832T3 (en) | 2009-04-16 |
PT1686880E (en) | 2009-02-10 |
CA2547789A1 (en) | 2005-06-02 |
DK1686880T3 (en) | 2009-03-16 |
US20070125354A1 (en) | 2007-06-07 |
AU2003280273A1 (en) | 2005-06-08 |
DE60324612D1 (en) | 2008-12-18 |
WO2005048796A1 (en) | 2005-06-02 |
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