EP3124872A1 - Four de cuisson domestique - Google Patents

Four de cuisson domestique Download PDF

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Publication number
EP3124872A1
EP3124872A1 EP15178509.4A EP15178509A EP3124872A1 EP 3124872 A1 EP3124872 A1 EP 3124872A1 EP 15178509 A EP15178509 A EP 15178509A EP 3124872 A1 EP3124872 A1 EP 3124872A1
Authority
EP
European Patent Office
Prior art keywords
cooking
temperature
auto
selection
heating element
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Withdrawn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
EP15178509.4A
Other languages
German (de)
English (en)
Inventor
Valentina VITALONI
Michele Marconi
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.)
Whirlpool EMEA SpA
Original Assignee
Indesit Co SpA
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 Indesit Co SpA filed Critical Indesit Co SpA
Priority to EP15178509.4A priority Critical patent/EP3124872A1/fr
Publication of EP3124872A1 publication Critical patent/EP3124872A1/fr
Withdrawn legal-status Critical Current

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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
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/08—Arrangement or mounting of control or safety devices
    • 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
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/08—Arrangement or mounting of control or safety devices
    • F24C7/087—Arrangement or mounting of control or safety devices of electric circuits regulating heat

Definitions

  • the present invention relates to household cooking apparatuses in general, and has been developed with particular reference to cooking ovens.
  • Ovens of the type referred to typically include a load-bearing structure, associated to which is a muffle defining a cooking cavity. Associated to the muffle is a plurality of heating elements, variously arranged, frequently constituted by electrical resistances.
  • the control system of the oven typically includes a control panel with a first selector, which can be operated by a user for selecting a cooking program from a plurality of possible programs, as well as a second selector, for manual setting of a desired cooking temperature from a plurality of possible temperatures.
  • the control panel of the oven also includes a timer device, via which the user can set a desired cooking duration.
  • the programs that can be selected by the user are in general programs substantially dedicated to the cooking of classes of foods, where the user can set the desired temperature.
  • the user is required to set both the desired program and a corresponding temperature: when the program is being executed, the control system of the oven controls one or more of its heating elements so as to manage a temperature profile in the cooking cavity that is variable as a function of the temperature selected by the user.
  • the user must hence make a selection from among the programs available, identifying the one he or she deems the most suitable for the type of food that is to be cooked, as well as a selection of a corresponding temperature.
  • This practice can complicate the activity of programming of the oven by the user, as regards selection of the program and of the temperature, likewise involving the risk of corresponding improper selections.
  • Not infrequent, then, is the case where the user starts the cooking program inadvertently leaving the temperature selector in the position used for a different program executed previously, with evident adverse consequences on the cooking process. Similar problems also apply in relation to setting of the duration of the cooking program.
  • the aim of the present invention is basically to limit the aforesaid drawbacks.
  • This aim is achieved, according to the present invention, by a household cooking oven and by a cooking program for a household oven having the characteristics specified in the claims.
  • the claims form an integral part of the technical teaching provided herein in relation to the invention.
  • references to "an embodiment” or “one embodiment” in the framework of the present description indicates that a particular configuration, structure, or characteristic described in relation to the embodiment is comprised in at least one embodiment.
  • phrases such as “in an embodiment” or “in one embodiment” and the like that may be present in various points in the framework of the present description do not necessarily all refer to one and the same embodiment.
  • the particular configurations, structures, or characteristics may be combined in any adequate way in one or more embodiments.
  • the references used in what follows are provided merely for convenience and do not define the sphere of protection or the scope of the embodiments.
  • the oven 1 has a load-bearing structure 2, located within which is a muffle 3, built in a way in itself known, which delimits part of a cooking cavity, designated by CC.
  • a front door 4 is hinged to the structure 2, in particular in a lower region thereof, designed to delimit the cooking cavity CC at the front and enable access to the inside thereof.
  • a control panel 5 which integrates a user interface described hereinafter, which forms part of a control system of the oven 1.
  • the above control system comprises an electronic board, represented only schematically in Figure 1 , where it is designated by CS, preferably comprising a microprocessor control unit.
  • the electronic control board CS is connected in signal communication to the aforesaid user interface, as well as to sensor means necessary for controlling operation of the oven, amongst which at least one sensor TS for detecting the temperature within the cooking cavity CC.
  • the electronic board CS is configured for driving - preferably using suitable power actuators - various electrical loads of the oven, amongst which at least one fan and a plurality of heating elements.
  • the oven according to the invention comprises at least one of a fan for circulation of air within the muffle 3 and an extraction fan, in particular for expelling cooking fumes/vapours from the muffle.
  • the oven 1 comprises both of the aforesaid fans, designated, respectively, by 6 and 7.
  • Each fan 6, 7 has a respective electric motor 6a, 7a, connected to the output shaft of which is a respective impeller 6b, 7b.
  • the muffle 3 has an intermediate partition wall 3a, which divides the cavity CC of the muffle 3 into a front, cooking, chamber, which extends between the door 4 and the partition wall 3a, and a rear, air-distribution, chamber S, which extends between the partition wall 3a and the rear wall of the muffle 3.
  • the cooking chamber there may be preferably positioned one or more shelves at different heights, on which the containers of the foods to be cooked can be set.
  • the impeller 6b of the fan 6 preferably of a centrifugal type with axis of rotation substantially horizontal.
  • the impeller 6b is positioned within a region circumscribed by the resistance 8, which preferably has a circular shape.
  • the distribution chamber S has an outlet section, for delivery of air to the cooking chamber, as well as an inlet section, for suction of air from the cooking chamber.
  • the aforesaid outlet section may comprise a plurality of passages in generally peripheral positions of the distribution chamber S, for example defined between the partition wall 3a and the rear wall or the side walls of the muffle 3, whereas the aforesaid inlet section is defined in a central area of the partition wall 3a, which is configured substantially in the form of a grill and is located in front of the impeller 6b.
  • the air is heated by the resistance 8 and pushed towards the peripheral outlet passages of the distribution chamber S so that it tends to flow along the side walls of the muffle 3 towards the front of the cooking chamber.
  • the fan 6 the same air is drawn towards the central grill-shaped area of the partition wall 3a in order to heat by convection the foods that are located on the shelf or shelves arranged within the cooking chamber.
  • This "exhausted" air which has yielded heat to the foods, then returns into the distribution chamber S so as to be heated again and re-introduced into the cooking chamber.
  • the muffle 3 has a fume/vapour outlet 3b at its upper wall, as well as a channelling 9 that extends above the upper wall of the muffle 3.
  • the channelling 9 has an outlet 9a that is located substantially at the front of the oven 1, above an upper portion of the door 4, at least one upper air intake 9b and a lower fume/vapour inlet 9c, in fluid communication with the outlet 3b of the muffle 3.
  • the fan 7 is preferably associated to the channelling 9 so as to take in air from the air intake 9b and fumes/vapours from the outlet 3b of the muffle 3 in order to expel a resulting mixture from the outlet 9a.
  • the fan 7 is preferably a radial fan, mounted in such a way that its impeller 7b - of a centrifugal type - is located within the channelling 9.
  • the centrifugal impeller 7b has an upper impeller section and a lower impeller section, which are pre-arranged for taking in air from the inlet 9b and fumes/vapours from the inlet 9c, respectively, with the aforesaid lower section that is positioned above the inlet 9c, substantially coaxial thereto and to the outlet 3b of the muffle.
  • the impeller 7b also enables air intake, in particular from the area that overlies the muffle 3 so as to reduce the temperature in this area, where some functional components of the oven 1 are mounted, amongst which for example the electronic control board CS.
  • heating elements 10 and 11 are two further heating elements, preferably constituted by electrical resistances, arranged inside and outside the cooking cavity CC, respectively.
  • the heating element 10 is positioned in the upper part of the cooking cavity CC to provide a so-called grill resistance
  • the heating element 11 is positioned underneath the cooking cavity CC, in particular underneath the lower wall of the muffle 3, to provide a so-called "sole resistance”.
  • Figure 2 is a schematic illustration of a possible embodiment of the aforesaid user interface, belonging to the control system of the oven and connected in signal communication to the electronic control board CS.
  • the interface designated as a whole by UI, comprises a first device S1, for manual selection of a cooking program from a plurality of selectable cooking programs, as well as a second device S2 for manual selection of a cooking temperature from a plurality of selectable cooking temperatures.
  • the devices S1 and S2 preferably comprise electrical selectors, very preferably with rotatable control knob.
  • the selector S1 enables manual selection of eleven programs, identified by the letters A to K and by the wording AUTO.
  • the control system and in particular the control unit of the board CS, is able to control execution of programs that can be executed by the oven 1 at least according to a selection made via the selector S1 and a selection made via the selector S2.
  • these programs differ from one another as regards the modes and times of activation of the electrical loads that contribute to cooking, and specifically the heating elements 8, 10, 11 and the fans 6, 7.
  • the logic that supervises the above modes and times for the various programs is, as has been said, implemented in the control system, in particular in the control unit of the board CS.
  • the programs that can be selected via the selector S1 comprise first programs A-K, during which the control system is able to control one or more of the heating elements 8, 10, 11 in order to manage a temperature profile in the cooking cavity CC that is variable as a function of a temperature selected via the selector S2.
  • the control system is in any case configured also for enabling, during execution of one of the programs A-K, modification of the selection made via the selector S2, i.e., modification of the desired temperature for the cooking cavity.
  • the programs A-K of a generally known conception, may comprise for example a traditional oven program, a multilevel cooking program, a grill cooking program, a baking program for cakes and the like.
  • the duration of the first programs A-K may be varied according to a choice made by the user.
  • the user interface UI comprises means for setting a duration of the cooking program, and the control system of the oven is configured for controlling execution of the program also as a function of the duration set.
  • the user interface UI includes a control means 12, which can be operated for selecting a timing function, a display device 13, and control means 14a, 14b, which can be operated for setting a duration. Via the control means 12, for example a key of a "touch" type, the user can activate programming of the duration, which corresponds to a corresponding graphic representation on the display 13.
  • the user can set the desired duration for the cooking program and then confirm his or her choice, for example by pressing again the key 12.
  • the means described can be configured also for programming a delayed start of the desired program ("delay timer" function).
  • the selector S2 is pre-arranged for enabling discrete selection of a certain number of temperature levels, but not excluded from the scope of the invention is the case of a selection of a continuous type.
  • seven temperature levels are envisaged, designated by 60°C, 100°C, 140°C, 160°C, 180°C, 220°C and MAX, the latter temperature being the maximum cooking temperature allowed for the oven.
  • the plurality of programs that can be selected via the selector S1 further comprises an automatic-cooking program, designated by AUTO, which constitutes a sort of "universal” or “multipurpose” cooking program, in the sense that it is suited for cooking various types of foods, even very different from one another, such as for example a roast, lasagne, doughnuts, a food containing filling, stuffed vegetables, buns.
  • AUTO automatic-cooking program
  • control system of the oven 1 is pre-arranged for:
  • the control system of the oven 1 manages in a completely automatic way the necessary electrical loads of the oven, without the need for the user to make any further settings, for example of temperature and/or times.
  • the automatic-cooking program AUTO has a substantially pre-set duration. Furthermore, in any case, following upon start of the program AUTO, the user of the oven 1 is prevented from the possibility of varying the pre-set temperature profile for that program.
  • the selector S2 defines an inoperative selection position and a plurality of operative selection positions.
  • Corresponding to the operative selection positions are the temperatures that can be selected via the selector S2 (i.e., 60°C, 100°C, 140°C, 160°C, 180°C, 220°C, MAX), whereas corresponding to the inoperative selection position, designated by S2 0 in Figure 2 , is the predefined position that starts the program AUTO, when the selector S1 is in the corresponding position.
  • the inoperative selection position S2 0 is a zero position of the selector S2, i.e., a position to which there does not correspond any of the temperatures that can be selected by the user.
  • the selector S1 it is also preferable for the selector S1 to have an inoperative position, i.e., a zero position to which there does not correspond any of the programs that can be selected by the user, preferably corresponding to an OFF condition of the oven: in the example, this position is designated by S1 0 .
  • FIG. 3 illustrates, via a simplified flowchart, the process of setting of the program AUTO.
  • the block 100 is the starting block, via which the control system checks whether the selector S1 is in the position AUTO. Control then passes to block 110, which is a test block, via which the system checks whether the selector S2 is in the position S2 0 . If it is (output YES), control passes to block 120, whereas, if it is not (output NO), control passes to block 130, with the control system that waits for programming, i.e., waits for the selector S2 to be brought into the position S2 0 : only after this selection does control pass to block 120.
  • Block 120 hence enables execution of the program AUTO.
  • Start of execution preferably occurs automatically, when the selector S1 is in the position AUTO and the selector S2 is in the position S2 0 .
  • the user interface UI is provided with a specific start key, pressing of which, after the selection made via the selectors S1, S2, starts the program chosen, or again the case where it is possible to set via the means 12, 13, 14a-14b, a delayed start of the program ("delay timer" function).
  • Selection and/or start of the program AUTO is preferably highlighted graphically also on the display 13.
  • Control then passes to block 140, which represents the end of the program AUTO, which may possibly be notified via a visual indication (for example, on the display 13) and/or an acoustic warning.
  • the control system then sets itself in an END or quiescence state.
  • Control then passes to block 150, of end-of-program, i.e., of end-of-cooking.
  • any temperature selection made via the selector S2 is rendered ineffective. Consequently, also in the case where the user turns the selector S2 into one of its operative selection positions, this action will have no effect on the pre-set temperature profile for the program AUTO.
  • the user is free to make other selections or actions that do not affect in any case the modes of management of the electrical loads envisaged for the program AUTO, such as for example turning-off of the oven, bringing the selector S1 into the corresponding inoperative or zero position, or selection of a different cooking program, by bringing the selector S1 into any one of the positions A-K.
  • the control system manages operation of at least one heating element internal to the oven and at least one heating element external to the oven, in particular the element 10 and the element 11.
  • the heating elements 10 and 11 can be activated continuously, or else cyclically, i.e., with activation steps separated by de-activation pauses.
  • the total duration of the de-activation pauses of the upper heating element 10 is longer than the total duration of the de-activation pauses of the external heating element 11.
  • the control system manages operation of at least one of the fans 6 and 7, very preferably of both of the fans. In this way, there is guaranteed an effective circulation of air on the foods being cooked, even though the air is not necessarily heated via the element 8, as well as an efficient evacuation of the moisture released by the foods being cooked.
  • the control system is pre-arranged for enabling operation at constant r.p.m. of both of the fans 6 and 7 during execution of the program AUTO.
  • Figure 4 illustrates schematically, in tabular form, the possible development of the program AUTO according to a possible embodiment of the invention.
  • the program AUTO comprises:
  • the second fixed time is longer than the first fixed time, and the second cooking temperature is higher than the first cooking temperature.
  • the time necessary for execution of the pre-heating step is not exactly predetermined, in so far as its execution terminates when a given temperature is reached, which can be detected via the temperature sensor TS.
  • the characteristics of the oven and of the heating elements are substantially known parameters
  • the time necessary for reaching the heating temperature envisaged for the pre-heating step is slightly variable as a function of external factors, such as for example the ambient temperature, the amount of foods being cooked, the type of containers for the foods (metal, ceramic, glass, etc.).
  • the total duration of the program AUTO is defined herein as being "substantially pre-set”.
  • the pre-heating step may have a duration comprised between 3 and 6 minutes, in particular 4-5 minutes.
  • the heating temperature that must be reached at the end of the pre-heating step is comprised between 130°C and 160°C, very preferably between 135°C and 150°C
  • the first cooking temperature, for execution of the first cooking step is preferably comprised between 140°C and 170°C, very preferably between 145°C and 165°C
  • the second cooking temperature, for execution of the second cooking step is preferably comprised between 160°C and 200°C, very preferably between 165°C and 190°C.
  • the aforesaid substantially pre-set three temperatures are 140°C, 150°C, and 180°C, respectively.
  • the first cooking step has a duration comprised between 5 and 15 minutes, whereas the second cooking step has a duration comprised between 30 and 50 minutes.
  • these durations are 10 and 40 minutes, respectively.
  • the heating elements 10 and 11 are both activated continuously, whereas during the first and second cooking steps the elements 10 and 11 are activated cyclically.
  • the resistance 8 (referred to as "circular" in Figure 4 ) is always inactive when the program AUTO is being executed.
  • the squares appearing in the section "ACTIVATIONS CYCLE" each correspond to a time of 12 seconds, with a total duty cycle of 2 minutes (10 squares x 12 seconds).
  • the total duration of the pauses of inactivity or non-supply of the element 10 (84 seconds) is longer than the total duration of the pauses of inactivity or non-supply of the element 11 (24 seconds).
  • the heating action performed by the sole resistance 11 is hence privileged.
  • the fans 6 and 7 are both active in the pre-heating step, in the first cooking step and in the second cooking step.
  • the fans 6 and 7 are driven at their maximum r.p.m., or in any case at an r.p.m. that is indicatively comprised between 1150 and 1350 r.p.m. for the fan 6 and 1200 and 1350 r.p.m. for the fan 7.
  • the program AUTO may further comprise a final heat-recovery step, which is also of substantially pre-set duration, during which the residual heating action provided by the elements 10 and 11 is exploited, even though these are not active or supplied in this step, to the advantage of energy saving.
  • a final heat-recovery step which is also of substantially pre-set duration, during which the residual heating action provided by the elements 10 and 11 is exploited, even though these are not active or supplied in this step, to the advantage of energy saving.
  • the recovery step which may have a duration comprised between 2 and 6 minutes, for example 4 minutes, both of the fans 6 and 7 are in any case active, preferably at the same r.p.m. as the one kept during the previous steps.
  • Figure 5 highlights graphically the time plot of the temperature within the cooking cavity CC.
  • an increase in temperature up to 140°C that determines the end of the pre-heating step, which is followed by a further increase to approximately 150°C, i.e., the temperature necessary for execution of the first cooking step; the increase to 150°C and maintenance of this temperature altogether last approximately 10 minutes.
  • an increase to approximately 180°C i.e., to the temperature necessary for execution of the second cooking step; in the example, the increase to 180°C and maintenance of this temperature last as a whole approximately 40 minutes.
  • the recovery step here has a duration of approximately 5 minutes, after which the program AUTO is terminated. In the example appearing in Figures 4 and 5 , then, the program AUTO has an total duration of approximately 60 minutes.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Stoves And Ranges (AREA)
EP15178509.4A 2015-07-27 2015-07-27 Four de cuisson domestique Withdrawn EP3124872A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15178509.4A EP3124872A1 (fr) 2015-07-27 2015-07-27 Four de cuisson domestique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15178509.4A EP3124872A1 (fr) 2015-07-27 2015-07-27 Four de cuisson domestique

Publications (1)

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EP3124872A1 true EP3124872A1 (fr) 2017-02-01

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Family Applications (1)

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EP15178509.4A Withdrawn EP3124872A1 (fr) 2015-07-27 2015-07-27 Four de cuisson domestique

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EP (1) EP3124872A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3808402A (en) * 1973-03-29 1974-04-30 Thermetic Controls Ltd Temperature regulator for electric ovens
DE10138062A1 (de) * 2001-08-03 2003-02-13 Bsh Bosch Siemens Hausgeraete Kochfeld sowie Bedienanordnung für ein Kochfeld
DE10342531A1 (de) * 2003-09-12 2005-04-21 Bsh Bosch Siemens Hausgeraete Steuerung für ein Haushaltgerät
EP1758000A1 (fr) * 2005-08-25 2007-02-28 Whirlpool Corporation Commande d'un four électronique avec recettes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3808402A (en) * 1973-03-29 1974-04-30 Thermetic Controls Ltd Temperature regulator for electric ovens
DE10138062A1 (de) * 2001-08-03 2003-02-13 Bsh Bosch Siemens Hausgeraete Kochfeld sowie Bedienanordnung für ein Kochfeld
DE10342531A1 (de) * 2003-09-12 2005-04-21 Bsh Bosch Siemens Hausgeraete Steuerung für ein Haushaltgerät
EP1758000A1 (fr) * 2005-08-25 2007-02-28 Whirlpool Corporation Commande d'un four électronique avec recettes

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