EP2375946A1 - Configuration souple à vis et racleurs pour appareil de friture par contact - Google Patents

Configuration souple à vis et racleurs pour appareil de friture par contact

Info

Publication number
EP2375946A1
EP2375946A1 EP09804118A EP09804118A EP2375946A1 EP 2375946 A1 EP2375946 A1 EP 2375946A1 EP 09804118 A EP09804118 A EP 09804118A EP 09804118 A EP09804118 A EP 09804118A EP 2375946 A1 EP2375946 A1 EP 2375946A1
Authority
EP
European Patent Office
Prior art keywords
screw
scraping
axis
elements
axle
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.)
Withdrawn
Application number
EP09804118A
Other languages
German (de)
English (en)
Inventor
Jens Lorenz Adler-Nissen
Rasmus Solmer Eriksen
Henning Rasmussen
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.)
Gastroprocess Technologies AS
Original Assignee
Gastroprocess Technologies AS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Gastroprocess Technologies AS filed Critical Gastroprocess Technologies AS
Publication of EP2375946A1 publication Critical patent/EP2375946A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J37/00—Baking; Roasting; Grilling; Frying
    • A47J37/12—Deep fat fryers, e.g. for frying fish or chips
    • A47J37/1214—Deep fat fryers, e.g. for frying fish or chips the food being transported through an oil-bath

Definitions

  • the present invention relates to an apparatus for stir-frying discrete pieces or particles of one or more foodstuffs, the apparatus comprising
  • - stirring means comprising an axle having a second axis extending generally parallel to said first axis and one or more screw elements arranged on said axle for providing a generally helical surface with a generally helical edge, thereby forming a screw arranged for rotation at least partly within and in close proximity to said heated surface such that rotation of said screw transfers said discrete pieces along said cylindrical body such that said screw and said heated surface form a screw conveyor, and
  • the frying/searing at high temperature results in the formation of a brown crust on the pieces of meat and vegetables.
  • the crust compounds which result from Maillard reactions and other chemical browning reactions, also tend to stick to the frying surface, and eventually they pyrolise and form dark deposits.
  • An extensive formation of dark deposits should be avoided, because the burnt deposits may contaminate the food products and also make cleaning difficult. Regular scraping of the surface is therefore needed to prevent this.
  • the scrapers must be mounted in a way so that they can exert a certain pressure on the frying surface, and this pressure has to be controlled within limits.
  • the scrapers must also fulfil requirements of hygienic design. Because scrapers are subjected to wear and must be replaced, it is also an advantage that they can be mounted and dismounted easily.
  • the body when the frying surface constituted by the interior surface of the cylindrical body is heated for implementing the frying process, the body will deform and become curved in a vertical plane containing the axis of the cylindrical body in a manner resembling the shape of a banana.
  • the scraper elements can be elastic and thus compensate for a certain, relatively small deformation of the frying surface, if the "banana" shape becomes too distinct, or other heat related deformations take place, some of the heated surface will not be scraped properly, or at all, with the consequent problems discussed above.
  • the main object of the present invention is to alleviate or solve this problem, and according to the invention this is achieved by the screw comprising one or more resiliently deformable elements adapted and arranged for allowing the helical edge with the scraping elements to move in a direction at right angles to the first axis such that if the cylindrical body because of thermal deformation deviates from extending parallel to the first axis, the scraping elements will continue to scrape substantially the entire heated surface when the screw rotates.
  • the scrapers can de displaced in a direction at right angles to the frying surface so as to follow the "banana" shape or other deformations thereof whereby scraping will be much more effective on the deformed portion of the frying surface.
  • the axle along the length thereof is provided with one or more regions having a smaller cross sectional area than the rest of the axle such that the region or regions serve as the resiliently deformable element or elements allowing the axle to deflect from a rectilinear shape.
  • the force of gravity can bend the axle around the region or regions with smaller cross sectional area.
  • the screw element is constituted by a continuous helical plate fixedly attached to the axle.
  • the screw elements comprise one or more, preferably three rows of discrete plates each shaped as a generally triangular pie section with one triangle side thereof forming a section of a circle and the other two triangle sides extending from each end of the circular side and intersecting one another at the apex of the triangular pie section, one of the intersecting sides being shorter than the other, the pie section being pivotably attached to the axle at the apex, and wherein the resiliently deformable elements comprise tension springs each having one end attached to the shortest of the sides of a plate and the other end attached to the axle.
  • the individual plates can follow the deformation of the frying surface by pivoting about the apex of the plate whereby the circular side of the pie shaped plate moves in and out relative to the axis of the surface in accordance with the deformation of the frying surface.
  • FIG. 1 is a schematic perspective view, partly in section, of a prior art apparatus for continuously stir-frying foodstuffs
  • Fig. 2 is a schematic enlarged view of a partial cross section taken along line 11-11 in Fig. 1 with some parts deleted for clarity,
  • Fig. 3 is a schematic enlarged elevational view of a portion of the helical body of the apparatus of Fig. 1,
  • Fig. 4 is a diagrammatic lateral elevational view of a stir-frying apparatus according to the invention illustrating the arrangement of a row of scraper elements according to the invention
  • Fig. 5 is a diagrammatic view of a portion of the screw of the apparatus in Fig. 4,
  • Fig. 6 is a diagrammatic sectional view along line X-X in Fig. 5 with the scraper elements removed
  • Fig. 7 is a diagrammatic, sectional and cut-off view of a reduced cross section area region of the shaft of the screw shown in Figs. 3-5,
  • Fig. 8 is a diagrammatic elevational view of the shaft of Figs. 3-7,
  • Fig. 9 is a schematic lateral elevational view of a scraper element according to the invention.
  • Fig. 10 is a view corresponding to Fig. 9 of the scraper element mounted in the apparatus and compressed against the heated surface of the screw conveyor,
  • Fig. 11 is a view corresponding to Fig. 10 illustrating how the scraper compensates for longitudinal curvature of the heated surface
  • Fig. 12 is a schematical perspective view of three turns of the screw and a scraper element pivotably attached and guided in a slot in each of the turns,
  • Fig. 13 is an enlarged view of the releasable and pivotable attachment of the scraper element in a slot in a turn of the screw
  • Fig. 14 is an enlarged cross-sectional view seen in the direction of the axis of the screw with three rows of scraper elements
  • Fig. 15 is a schematic elevational view of a section of the currently preferred embodiment of the apparatus according to the invention where only one of three rows of screw plates is shown, and
  • Fig. 16 is a schematic cross sectional view along line Y-Y in Fig. 15, where all the three rows of screw plates and the entire heated surface or casing are shown.
  • a prior art stir-frying apparatus disclosed in US patent No. 6,331,323 (the disclosure of which is hereby incorporated herein by reference) comprises a housing 1 carried by support legs 2 and associated with two bearing assemblies 3 in which a helical body or screw conveyor 4 is rotatably journalled, the body 4 comprising a helical plate 5 attached to a shaft 6.
  • the bearing assemblies 3 at either end of the shaft 6 are each supported by a respective piston rod 7 of a hydraulic cylinder and piston assembly 8 pivotally attached by means of pivot 9 to a bracket 10 bolted to a not shown fixed element alongside the housing 1 or a not shown element fixedly attached to the housing 1.
  • the helical body 4 is thus suspended movable in a generally vertical direction because of the possibility of pivoting around the pivots 9.
  • the helical body 4 may also be moved substantially horizontally to and fro in a direction transverse to the axis of the shaft 6 by means of the reciprocating action of the piston rods 7 of the cylinder and piston assemblies 8.
  • the assemblies 8 are activated by means of hydraulic fluid supplied through conduits 8 a communicating with a hydraulic fluid pump (not shown) controlled by a conventional controlling means (not shown) arranged in a control cabinet 11.
  • the shaft 6 is at one end connected to a an electrical drive unit comprising an electrical motor 12 and a gear box 13 by means of a double universal joint 13a allowing movement of the shaft 6 in all directions transverse to the axis of the shaft relative to the drive unit 12, 13.
  • the drive unit 12, 13 is fixedly arranged relative to the housing 1, and the speed of rotation of the electrical motor 12 is controlled by a conventional controlling means (not shown) in the control cabinet 11.
  • a cylindrical body having a thick-wailed portion 14 and a thin-walled portion 15 is arranged in the housing 1 substantially coaxially with the helical body 4.
  • the thin walled portion is peripherically somewhat longer at one side than the other so that discrete pieces of foodstuff transported by the helical body 4 as indicated by the arrow T in Fig. 7 will not be pushed out of the cylindrical body.
  • the portion 14 is heated by means of an elongate gas burner assembly 16 arranged in the housing 1 below the cylindrical body 14, 15.
  • Gas for the gas burner assembly 16 is supplied through a gas conduit 17, and air for combustion as well as odour removing ventilation is supplied by a fan 18 communicating with a combustion chamber 19 arranged in the lower part of the housing 1 and accommodating the gas burner assembly 16. Exhaust gases from the combustion and ventilating air are removed from the housing through a venting portion 20 of the housing 1.
  • the portion 15 may also have the same thickness as the portion 14.
  • a protecting wire mesh 21 is arranged over the helical body 4, 5 and the cylindrical body 14, 15 to avoid accidents caused by introduction of any object or a hand into the elongate aperture 21 at the top of the cylindrical body 14, 15.
  • Foodstuff introduction funnels 22-24 are arranged on the housing 1 for introducing finely cut or diced foodstuffs through the aperture 21 into the cylindrical body 14, 15 at different points along the length thereof. The funnels 22-24 penetrate apertures therefor in the wire mesh 21.
  • an outlet aperture (not shown) in the bottom of the portion 14 communicates with a ramp member 25 for transferring stir-fried foodstuffs from the cylindrical body to a conveyor 26 for transferring the foodstuffs to further processing apparatus or storage means (not shown).
  • the axis of the helical body 4, 5 and the cylindrical body 14, 15 is inclined slightly upwards from the inlet end to the outlet end.
  • the inclination is adjustable by means of adjustment elements (not shown) that allow tilting the apparatus or part of same to adjust the inclination of said axis so that the axis also may be horizontal or inclined downwards from the inlet end towards then outlet end.
  • the helical rim 5 a of the helical plate 5 is along the entire length thereof provided with a series of equally spaced scraping and stirring elements 27, some solely comprising a scraping portion 27a and the rest additionally a stirring/scraping portion 27b, the elements 27 being firmly and removably attached to the helical rim by locking engagement of a locking projection 27c of the element 27 in a corresponding locking recess 5b in the rim 5a of the plate (shown with broken lines in Fig. 2) or alternatively or additionally, for instance, by frictional clamping engagement between the element 27 and the rim 5a.
  • the elements 27 are made of a suitable material having good wear properties such as a suitable plastic material such as Teflon, stainless steel, nylon or PEEK.
  • discrete pieces 28 (Fig. 7) of finely cut or diced foodstuffs such as vegetables or meat are introduced through the funnel 22 together with an optional frying substance such as oil or fat, and further discrete pieces and optionally further frying substance may be introduced through funnels 23 and 24.
  • the cylindrical portion 14 is heated to a predetermined temperature controlled by conventional controlling means (not shown) controlling the gas burner gas consumption in dependency of temperature measurements via not shown conventional thermometer means arranged for measuring the temperature of the portion 14.
  • the helical body 4, 5 is rotated at a predetermined and variable speed of rotation depending on the foodstuffs to be fried and the temperature of the cylindrical portion 14.
  • the co-operation between the helical body 4, 5, the scraping/stirring elements 27 and the interior surface of the cylindrical portion 14 serves to move the discrete pieces 28 forward along the inner surface of the cylindrical portion 14 substantially parallel to the axis thereof, while at the same time stirring them so as to continuously bring new surface portions of the discrete pieces 28 into heat conducting contact with the heated inner surface of the cylindrical portion 14.
  • the scraping/stirring elements 27 are pressed against the interior surface of the cylindrical portion 14 by the effect of the weight of the helical body 4, 5 as the entire weight of same is supported by the cylindrical portion 14 because of the pivotable suspension of the assemblies 8.
  • the helical body 4, 5 is moved in a direction transverse to the axis thereof by means of the cylinder piston assembly 8, the piston rod 7 being reciprocated so that the helical body 4, 5 is forced to move transversely such that region of maximum pressure between the elements 27 and the interior surface of the cylindrical portion 14 moves to and fro along the circumference thereof such that maximum scraping pressure is intermittently applied to substantially the entire inner surface of the heated cylindrical portion 14.
  • This transverse movement of the helical body is allowed relative to the drive unit 12, 13 by the double universal joint 13a.
  • This effect may also be obtained by mounting the drive unit for transverse movement together with the helical body or by arranging the motor 12 laterally relative to the helical body and replacing the gear box 13 by a chain and sprocket wheel interconnection to the shaft 6.
  • a resiliently deformable element 6a for allowing the helical edge or rim 5a of the screw 4 to move at right angles to the axis 34 so as to allow the scrapers to scrape the bent down portion of the heated surface, is illustrated.
  • the resiliently deformable element 6a is a reduced cross section area region of the shaft 4 which is made as shown in Fig. 7 where a tube 6b has been welded to two tubes 6c having a larger diameter than tube 6b by means of discs 6d and 6e.
  • the elements 6a will function as resilient hinges allowing the shaft 4 to bend such that the rim 5 a of the screw 4 can follow the deformation of the casing 14 such that the scraping elements 27 can also scrape the middle portion of the heated surface even when the casing 14 has a "banana" -like shape when heated.
  • the number of elements 6a and the locations thereof along the length of the shaft 6 may be varied, but is currently preferred that three elements are arranged as shown in Fig. 8.
  • a row of scrapers 32 that will be described more in detail below are shown mounted in slots 33 on the rim 5a of the turns of the screw.
  • the scrapers are placed at an angle v (see Fig. 5) relative to the axis 34 of the screw for ensuring a smooth contact between the scrapers and the frying surface of the casing during rotation of the helix.
  • the number of rows of scrapers can be from two to six depending on the specific use of the apparatus. In Fig. 6, the possibility of mounting three rows of scrapers is exemplified.
  • a scraper 32 comprises a first elongate body or scraping beam 35 having a substantially planar and rectilinear scraping surface 36 for engaging and scraping the frying surface.
  • the beam 35 has a first end portion 36 and a second end portion 37.
  • the scraper 32 also comprises a second elongate body or biasing beam 38 having a third end portion 39 and a fourth end portion 40 and a central first screw attachment portion 41 provided with a concave circular cylindrical surface portion.
  • the scraping beam 35 is interconnected with the biasing beam 38 by means of two rigid rods or beams 43.
  • Three consecutive turns 44-46 of the screw 4 are provided with slots 47-49, respectively, extending from the rim of the turns towards the axis of the screw.
  • the bottom of the slot 48 of the intermediate turn 45 is provided with a second screw attachment portion 50 having a convex circular cylindrical surface portion 51 in pivotable contact with surface portion 42 of the beam 38.
  • the depth or extent of the slots 47-49 is such relative to the total height or dimension of the scraper 32 at right angles to the scraping surface that the beam 35 projects a certain distance outside the slots as shown in exaggeration in Fig. 12.
  • the beam 35 project between 3 and 10 mm outside the slots such that when the beam is pressed against the frying surface, the spring or biasing function of beam 38 is activated as shown in Figs. 10 and 11.
  • the frying surface is not perfectly rectilinear for a number of reasons, primarily because of the effect of heating the casing from the bottom which gives rise to a slight "banana" shape, i.e. an upwards concave arcuate shape.
  • a slight "banana" shape i.e. an upwards concave arcuate shape.
  • the screw attachment means can be constructed in other manners than shown, for instance the concave cylindrical surface 42 may be arranged on the portion attached to the screw or the cylindrical surfaces may be substituted by co-operating concave and convex spherical surfaces.
  • the beams 35 and 38 do not necessarily have to be rectangular in cross section as long as the scraping surface 36 is substantially rectilinear.
  • the material of the scraper is preferably PEEK, but other resilient materials such as Nylon and Teflon or any other resilient food-approved materials may be employed.
  • the material used should of course be stable at the frying temperatures employed. Although it is preferred that the scraper spans over three turns of the screw, it is envisioned that longer scrapers spanning 4 or more turns may be useful and perhaps have the advantage of ease of replacement.
  • a circular cylindrical heated casing 60 having an axis 61 partly surrounds an axle or shaft 62 having the same axis 61.
  • the shaft 62 carries three rows of plane plates 63, 64 and 65, respectively.
  • the plates 63-65 are shaped like triangular pie sections having a circular side or edge 66 and two straight edges or sides 67 and 68 intersecting one another at the apex 69 of the triangular plate.
  • the plates 63-65 are mounted on pivots 70 attached to the shaft 62 in such a manner that the plates can rotate around the pivot, the plates are inclined such that the plane of a plate forms an acute angle with the axis 61, and the neighbouring plates of the rows 63-65 are mutually offset as indicated in Fig. 17 such that a helical surface or virtual screw is formed where the sides 66 correspond to the rim 5a of the screw 4 of the previously described embodiment.
  • the side 67 is shorter than the side 68, and one end of a tension spring 71 constituting a resiliently deformable element according to the invention is attached to the short side 67 and the other end is attached to a pivot 72 attached to the shaft 62.
  • a scraping element 73 having a circular outer surface 74 and wherein beam-like or rod-like elements 75 arranged at either end and spaced therefrom are attached to the scraper beam 73 by means of transverse connection rods 76 and 77.
  • An attachment portion 78 similar to the attachment portion 41 in Figs. 9 and 13 is adapted for receiving an attachment pin 79 on the plate 63 for pivotable attachment of the scraper 73 to the plate 63.
  • Support pins 80 and 81 on the plate 63 are adapted to support the rod elements 75 when the scraper 73 is attached to the plate 73 by attachment portion 79.
  • the material of the scraper is preferably PEEK, but other resilient materials such as Nylon and Teflon or any other resilient food-approved materials may be employed.
  • the material used should of course be stable at the frying temperatures employed.
  • lateral support elements attached to the rim area of the plate support the scrapers 73 against movement in a direction transverse to the plane of the plates 63-65 so that the scrapers are supported against the friction forces exerted transversely on the scrapers 73 by the heated surface during scraping thereof when the screw constituted by the axle 62 and plates 63-65 turns in the clock- wise direction indicated by the arrow Rl.
  • the plate 63 When the plate 63 reaches the slightly flared right hand edge of the casing 60, the plate will be forced to pivot counter clock- wise against the bias of the spring 71 and will thereby be forced closer to the axis 61.
  • the pins 80 and 81 will resiliently deform the rods 75 in the manner shown in Fig. 16 so that an effective scraping pressure is exerted by the scraper surface on the frying surface at all times.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Baking, Grill, Roasting (AREA)

Abstract

L’invention concerne un appareil servant à faire sauter des morceaux ou particules discrets d’un ou de plusieurs aliments, l’appareil comportant : - une surface chauffée sous la forme de la surface intérieure d’un corps cylindrique sensiblement circulaire (14) présentant un premier axe, - des moyens (4) de brassage comportant un arbre présentant un deuxième axe s’étendant de façon généralement parallèle audit premier axe et un ou plusieurs éléments (5) de vis disposés sur ledit arbre pour donner une surface généralement hélicoïdale présentant un bord généralement hélicoïdal (5a), formant ainsi une vis configurée de façon à tourner au moins partiellement à l’intérieur et à proximité immédiate de ladite surface chauffée de telle sorte que la rotation de ladite vis transfère lesdits morceaux discrets le long dudit corps cylindrique de façon sensiblement parallèle audit premier axe de telle sorte que ladite vis et ladite surface chauffée forment un convoyeur à vis, et – des éléments racleurs (27) disposés sur ledit bord hélicoïdal afin de racler ladite surface chauffée lorsque ladite vis tourne de façon à éliminer une éventuelle couche de matière issue des aliments et adhérant à ladite surface chauffée, ladite vis comportant un ou  plusieurs éléments élastiquement déformables (6a) prévus et agencés pour permettre audit bord hélicoïdal muni desdits éléments racleurs de se déplacer dans une direction orthogonale audit premier axe de telle sorte que si ledit corps cylindrique, en raison d’une déformation thermique, s’écarte de son alignement parallèle audit premier axe, lesdits éléments racleurs continuent à racler sensiblement toute la surface chauffée lorsque ladite vis tourne.
EP09804118A 2008-11-14 2009-11-13 Configuration souple à vis et racleurs pour appareil de friture par contact Withdrawn EP2375946A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200801581 2008-11-14
PCT/DK2009/050301 WO2010054665A1 (fr) 2008-11-14 2009-11-13 Configuration souple à vis et racleurs pour appareil de friture par contact

Publications (1)

Publication Number Publication Date
EP2375946A1 true EP2375946A1 (fr) 2011-10-19

Family

ID=41698106

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09804118A Withdrawn EP2375946A1 (fr) 2008-11-14 2009-11-13 Configuration souple à vis et racleurs pour appareil de friture par contact

Country Status (2)

Country Link
EP (1) EP2375946A1 (fr)
WO (1) WO2010054665A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105166595A (zh) * 2015-08-11 2015-12-23 林后准 一种油炸、卤味入味装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB596128A (en) * 1945-07-20 1947-12-29 Dennis Kilbuern Apparatus for cooking fish and/or chipped potatoes and the like
DE69506977T2 (de) * 1994-09-22 1999-05-27 Societe Des Produits Nestle S.A., Vevey Fritiergerät und Verfahren
WO1999029218A1 (fr) 1997-12-09 1999-06-17 Adler Nissen Jens Procede et appareil pour frire a la chinoise
US6331132B1 (en) 1999-07-27 2001-12-18 What's Next Manufacturing, Inc. Yo-yo having improved tether tension control and adjustable mechanism
US20110023725A1 (en) * 2008-03-28 2011-02-03 Gastroprocess Technologies A/S apparatus for stir-frying

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010054665A1 *

Also Published As

Publication number Publication date
WO2010054665A1 (fr) 2010-05-20

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