Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
  • F23D14/12—Radiant burners
  • F23D14/18—Radiant burners using catalysis for flameless combustion
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23N—REGULATING OR CONTROLLING COMBUSTION
  • F23N1/00—Regulating fuel supply
  • F23N1/02—Regulating fuel supply conjointly with air supply
  • F23N1/025—Regulating fuel supply conjointly with air supply using electrical or electromechanical means
• • 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
  • F24C3/00—Stoves or ranges for gaseous fuels
  • F24C3/04—Stoves or ranges for gaseous fuels with heat produced wholly or partly by a radiant body, e.g. by a perforated plate
  • F24C3/06—Stoves or ranges for gaseous fuels with heat produced wholly or partly by a radiant body, e.g. by a perforated plate without any visible flame
  • F24C3/067—Ranges
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23N—REGULATING OR CONTROLLING COMBUSTION
  • F23N2241/00—Applications
  • F23N2241/08—Household apparatus
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23N—REGULATING OR CONTROLLING COMBUSTION
  • F23N5/00—Systems for controlling combustion
  • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
  • F23N5/10—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples

Definitions

• the present invention relates to a cooking appliance with a catalytic burner.
• a heating appliance has been described, generally comprising: a catalytic burner constituted by at least one member for mixing or admixing primary air which oxidizes with a flow of combustible gas , to obtain a mixture to be burned; the flow of combustible gas being controlled by a valve or other equivalent control means, and the primary air being driven by the flow of combustible gas; at least one distribution chamber for the mixture to be burned, and a catalytic combustion structure through which the mixture passes, from its upstream face in relation to the distribution chamber, to its downstream face discharging the combustion fumes; a thermal receiver placed at a distance from the catalytic combustion structure, extending from the interior side opposite one of the faces of this structure, in this case facing its upstream face, along practically the entire surface of said structure, and arranged and constructed to dissipate on the external side at least part of the thermal energy received by radiation mainly, and incidentally by convection, from the cata
• a heating device with catalytic burner of the same type as that defined above has been described and proposed, but nevertheless being distinguished from the latter by the following main technical characteristics: - primary air oxidizer is drawn by a fan, and mixes with the combustible gas, to obtain the mixture to be burned; - The thermal receiver extends from the inner side facing the downstream face of the catalytic combustion structure, through which the combustion fumes are evacuated;
• heating appliance is meant, generally, any portable appliance or not, integrating or connected to a source of combustible gas, for example town gas under low pressure or expanded pressure, and using the heat of combustion produced by the catalytic burner for cooking purposes.
• a source of combustible gas for example town gas under low pressure or expanded pressure
• different cooking devices for domestic or professional use for example a hob.
• Such a cooking appliance optionally includes other elements or members allowing its use in the chosen function or destination, for example means of integration into a cooking surface if the cooking appliance considered is a cooking stove of domestic type.
• catalytic structure or “catalytic combustion structure” is meant any structure permeable to the mixture to be burned, generating a pressure drop during the passage of this mixture, from the upstream face to the downstream face of the structure considered.
• This structure extends on the surface, transversely or perpendicular to the direction of passage of the mixture to be burned.
• This structure includes an inert support vis-à-vis the mixture to be burned, combustible gas, and combustion gases, and mechanically or chemically resistant to the high temperatures generated by catalytic combustion.
• This support is coated, at least on its internal surface or surfaces, directly or indirectly, with a catalytic material proper, such as platinum or platinum salts, catalyzing combustion.
• catalytic structures consisting of a wafer or a core of a refractory material such as ceramic or metal, crossed by a plurality of adjacent transverse channels, spring from the preceding definition.
• honeycomb consisting of a wafer or a core of a refractory material such as ceramic or metal, crossed by a plurality of adjacent transverse channels, spring from the preceding definition.
• refractory material such as ceramic or metal
• the present invention relates to means allowing the user to fine-tune or adjust the heating power of the cooking appliance, continuously in a relatively large range or range of values, without interrupting the operation of the burner. catalytic, and maintaining the performance of catalytic combustion at an optimum level.
• the manual control member of the flow of combustible gas for example the valve, is arranged to allow a continuous and autonomous variation of said flow;
• the device comprises a member for controlling the aeration rate of the mixture to be burned, arranged so as not to act in normal operation on the flow of combustible gas, that is to say not to control the control member for said flow, but arranged to act at least on the flow of combustion air drawn by the fan, as a function of the flow of combustible gas controlled independently by the user with the manual command, ; in normal operation, the control mode increases the flow of combustion air when the flow of combustible gas increases, and conversely decreases said flow of combustion air when the flow of combustible gas decreases.
• a cooking appliance which has both great flexibility and good precision of the calorific power available for cooking, simply by manually adjusting the flow rate of the combustible gas. This allows all kinds of cooking, from “simmering" to full cooking, on the one hand, while being able to adjust relatively relatively the power of the catalytic burner in each cooking range, including in simmering, on the other go.
• the present invention also aims to improve the operation of a cooking appliance as defined above, by maintaining the performance of catalytic combustion at an optimum level, regardless of the calorific power of the appliance, adjusted elsewhere. by the user.
• a cooking appliance comprising a fan drawing the primary oxidizing air, furthermore comprises a member for controlling the aeration rate of the mixture to be burned, as a function of the flow of combustible gas controlled by the tap, and acting on the flow of combustion air drawn by the fan, in order to increase the latter during normal operation when the flow of combustible gas increases, and conversely decrease it when the flow of combustible gas decreases.
• control member is arranged to maintain the aeration rate of the mixture to be burned in normal operation, in a range between 0.8 and 1.5.
• FIG. 1 shows an overall diagram of a cooking stove according to the invention, supplemented by a member and various control means;
• FIG. 2 represents an embodiment, of the electro-mechanical type, of the member and means for controlling the cooking stove shown in FIG. 1.
• the cooking stove shown in Figure 1 is integrated or belongs to a table or hob, horizontal, shown schematically by the reference numeral 31; this hob 31 may include one or more cooking stoves as described below.
• the or each stove is associated with a member, or valve 4 for manual control of the combustible gas 3, a solenoid valve 22 for safety, controlling the supply of combustible gas, and a member 11 for controlling the aeration rate of the mixture. 7 to be burned, all these components or means being disposed under the hob 31, in any suitable arrangement, while the control wheel 18 of the tap 4 and the axial button 32 for manual actuation of the solenoid valve 22 are mounted above the hob 31, in an accessible manner to the user or operator of the cooking stove.
• the cooking appliance or complete cooking stove according to the invention, comprises: a catalytic burner 1 proper, embedded in the cooking table 31; a thermal receiver 10, arranged horizontally just above the cooking surface 31, the upper or outer face or side of which can thus receive or support a thermal load, for example a pan; the manual control valve 4 for the flow of combustible gas 3, and 1 • safety solenoid valve 22, mounted and integrated coaxially in the valve 4, as described below, and whose respective control members 18 and 32 manual are arranged outside and above the hob 31; the tap 4 makes it possible to continuously vary the flow rate of the combustible gas, from a zero value to a maximum value for example, under the sole action of the user or operator, independently of the control member 11 defined above.
• control member 11 for the aeration rate of the mixture to be burned 7, comprising all appropriate control means 12, of the electrical, electronic, electro-mechanical or micro-electronic types, arranged in an appropriate manner to implement the control procedure adopted according to the invention, and defined below; in accordance with FIG. 2, the control means 12 explained are of the electro-mechanical type; the control member 11 and its various auxiliary elements described below are integrated in the hob 31, in a hidden manner for the user or operator.
• the catalytic burner 1 is constituted by a member 2 for mixing the combustible gas 3 controlled by the tap 4 and / or the solenoid valve 22, and the primary oxidizing air 5 drawn by the fan 6, to obtain at its outlet a flow of the mixture 7 to be burned.
• the combustible gas under low pressure for example natural gas, can be introduced into the member 2 by any suitable means, for example a simple injector.
• a structure 9 of catalytic combustion arranged transversely or perpendicularly to the direction of circulation of the gases, crossed by the mixture to be burned from its upstream face 9a in relation to the distribution chamber 8, to its downstream face 9b discharging the combustion fumes; a chamber 33 for collecting combustion fumes, in relation to the downstream face 9b of the structure 9 of catalytic combustion, and discharging the fumes to the outside and above the hob 31, around the chamber 8 of distribution.
• the thermal receiver 10 consisting of a circular glass-ceramic plate, is supported above the hob 31 by a thermally insulated ring 34, and closes the chamber 8 for dispensing the mixture to be burned.
• This receiver 10 is arranged horizontally at a distance from the catalytic structure 9, and extends from the inner or lower side, facing the upstream face 9a of the structure 8, along practically the entire surface of the latter, from so as to receive the heat generated by the catalytic burner 1, mainly by radiation.
• the thermal receiver 10 dissipates on the outside or upper side at least part of the thermal energy received by radiation and convection from the catalytic burner 1, towards any thermal load, for example a pan arranged substantially horizontally in the position of use on the receiver or vitro-ceramic plate 10, itself horizontal.
• the valve 4 for manual control of the fuel gas flow 3, the safety solenoid valve 22, controlling the supply of fuel gas 3, and their respective control means 18 (control wheel) and 32 (push button), constitute one and the same component, traditional, in the sense that several manufacturers, for example the French company SAUTER, manufacture and sell them, for example in a hob sold under the commercial reference LINEAFLAMME in 1995, with regard to the aforementioned Company. Also, the description of this component will be limited below to its essential elements or parts for the operation or control of the cooking appliance according to the invention.
• the tap 4 is of the plug type and comprises a body 16 with an axial bore 16a, and a rotary element or plug 17, fitted in the bore 16a, and whose relative position in rotation relative to the body 16 determines the flow of combustible gas passing through the valve 4, and whose rotation relative to the body 16 continuously varies the same flow.
• the control wheel 18 is linked in rotation to the rotary element or plug 17.
• the safety solenoid valve 22 is mounted coaxially in the tap 4, and more precisely coaxially with the plug 17, to control the supply of the combustible gas 3 in the open or closed position.
• This solenoid valve includes:
• a control pusher 32 emerging at the center of the control wheel 18 of the valve 4, movable in translation relative to the wheel 18, for manually bringing the valve 24 into the open position;
• the main function of the control member 11 is to control the aeration rate of the mixture 7 to be burned, as a function of the flow rate of combustible gas 3, itself controlled manually and independently by means of the tap 4 by the user or operator, depending on the start-up and the calorific power desired by the latter. And to do this, the control member 11 acts on the flow of combustion air 5, drawn by the fan 6, to increase in normal operation the flow of combustion air drawn when the flow of combustible gas increases, and to decrease the flow of combustion air drawn when the flow of combustible gas decreases.
• control member 11 is arranged to maintain, during normal operation of the cooking appliance, the aeration rate of the mixture to be burned 7, in a range between 0.8 and 1 , 5.
• the flow of pulsed oxidizing air 5 is increased or decreased discontinuously, in particular by successive stages.
• control body 11 communicates:
• control line 13 With a means for controlling the speed of the fan 6, in particular the supply voltage of the electric motor driving it;
• the sensor 19 comprises, on one side a slider 20 integral in rotation with the rotary element or plug 17, or with the control wheel 19, and on the other side a series of fixed studs 21a to 21d, of electrical contact with the slider 20 during its own rotation, said studs being electrically connected to switching means inserted in the electrical supply circuit of the electric motor of the fan 6.
• the tap 4 and the various elements constituting it are arranged in correspondence with the control wheel 18, and the various studs of the sensor 19, so that:
• the continued rotation of the flywheel 18 corresponds to a progressive decrease in the flow rate of the combustible gas, with passage of the cursor 20 on the pads 21b, 21c, and 21d respectively, corresponding to successive stages of decrease in the flow rate of combustion air 5 tapped.
• the same control means 11 is also arranged to maintain the aeration rate of the mixture to be burned, in a range of between 0.8 and 0.9, during a start-up phase of the catalytic burner 1, identified or detected for example by the passage of the tap 4 from its stop position 15 to its open position, corresponding to the stud 21a.
• control member includes a temperature sensor 25 within or close to the structure 9 of the catalytic combustion, connected by a line 36 to said member 11. And the latter is arranged to control the electro- valve 22, and more precisely the electromagnet 23, in the open position, if the operating temperature of said structure is at least equal to a set value, and in the closed position, if this same operating temperature is lower than this setpoint.
• This same control member 11 is also arranged to control the maintenance of the solenoid valve 22, and more precisely the solenoid 23, in the open position, for a time. predetermined corresponding to the aforementioned start-up phase of the catalytic burner 1, identified as above by the passage of the valve from its stop position 15 to its open position indexed by the stud 21a.
• a light indicator 26 connected by a line 37 to the control member 11, controlled by the latter to be switched on if the operating temperature is at least equal to the set value, and off if the operating temperature is lower than this set value.
• the control member 11 is also arranged to maintain the flow of oxidizing air 5 drawn at a non-zero value, for example by controlling the supply voltage of the motor driving the fan 6, and this for a predetermined period during the shutdown of the catalytic burner 1, identified or detected by the return passage of the cursor 20 on the pad 21a, and during which the flow of combustible gas 3 therefore has a zero value.
• the apparatus also comprises a generator 28 of at least one electric spark, near the downstream face 9b of the structure 9 of catalytic combustion, this generator being connected to the control member 11 by a line 38.
• This member 11 is arranged to temporarily control the generator 28 during the start-up phase of the catalytic burner, identified as indicated above by the passage of the tap 4 from the stop position 15 to the open position starting with the stud 21a.
• FIG. 2 the electro-mechanical embodiment 12 of the control member 11 previously described, in relation to its various auxiliary elements, is shown by the assembly diagram in FIG. 2, in which the same numerical references as those used in Figure 1 indicate the same elements, components or bodies.
• a remote control relay 39 comprising two contacts 391 and 392, connected to the pad 21a, in relation to the control wheel 18;
• a delayed bonding delay relay 46 the output of which communicates according to the position of its electrical contact with one or the other of two different adjustable resistors 48 and 49, arranged in parallel in the supply circuit of the electric motor fan 6;
• a time delay relay 47 for take-off delay with two electrical contacts, controlling the supply of relay 46 and its contact;
• a comparator 30 connected to the sensor 25 of the operating temperature, to the light indicator 26 of operation, and to the electromagnet 23 of the solenoid valve 22, and making it possible to subject the operation of the light indicator 26 and the electromagnet 23 at the operating temperature of the catalytic structure 9; - an electrical circuit powered by a battery 75, and connecting the aforementioned elements together, as well as to the fan motor 6.
• the comparator 30 delay time can be set to the relay 47 delay time.
• the indicator lamp 26 is on, the solenoid valve 22 in the open position, and the control tap 4 in the position maximum flow.
• the flow rate of the combustible gas 3 is reduced, which reduces the speed of the fan 6 in correspondence and simultaneously, for example in stages, as established below:
• the relay 40 When the cursor 20 passes over the pad 21b, the relay 40 is supplied, whereby the resistor 43 is inserted in the fan supply circuit 6, in series with the battery 75, and so on when the cursor passes on the pads 21c and 21d, to additionally insert the resistors 44 and 45 respectively;
• the speed of the fan 6 remains fixed, but the variation in the flow rate of the combustible gas is sufficiently low so that it remains within the admissible range of the ventilation rate required for the burner catalytic.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Regulation And Control Of Combustion (AREA)
• Gas Burners (AREA)
• Baking, Grill, Roasting (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=9484701

Family Applications (1)

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• 1995
  • 1995-11-14 FR FR9513692A patent/FR2741140B1/fr not_active Expired - Fee Related
• 1996
  • 1996-11-13 CZ CZ972201A patent/CZ220197A3/cs unknown
  • 1996-11-13 JP JP9518708A patent/JPH10512950A/ja active Pending
  • 1996-11-13 CA CA002210468A patent/CA2210468A1/fr not_active Abandoned
  • 1996-11-13 CN CN96191446A patent/CN1172524A/zh active Pending
  • 1996-11-13 AU AU73292/96A patent/AU7329296A/en not_active Abandoned
  • 1996-11-13 BR BR9607087A patent/BR9607087A/pt unknown
  • 1996-11-13 WO PCT/IB1996/001224 patent/WO1997018416A1/fr not_active Application Discontinuation
  • 1996-11-13 IL IL12117196A patent/IL121171A0/xx unknown
  • 1996-11-13 EP EP96935258A patent/EP0811132A1/fr not_active Withdrawn
  • 1996-11-13 NZ NZ320548A patent/NZ320548A/en unknown
  • 1996-11-13 PL PL96321315A patent/PL321315A1/xx unknown
  • 1996-11-13 HU HU9801265A patent/HUP9801265A3/hu unknown
  • 1996-11-14 AR ARP960105176A patent/AR004585A1/es unknown
  • 1996-11-14 ZA ZA9609593A patent/ZA969593B/xx unknown
  • 1996-11-14 TW TW085113945A patent/TW318879B/zh active
• 1997
  • 1997-06-20 BG BG101651A patent/BG101651A/xx unknown
  • 1997-07-10 IS IS4519A patent/IS4519A/is unknown
  • 1997-07-11 NO NO973240A patent/NO973240L/no unknown

Non-Patent Citations (1)

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