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
  • F24C3/00—Stoves or ranges for gaseous fuels
  • F24C3/12—Arrangement or mounting of control or safety devices
  • F24C3/126—Arrangement or mounting of control or safety devices on ranges
• • 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

Definitions

• the information relates to a hob
• each burner includes one or more perforated plates, generally made of ceramic, in which micro-holes are formed through which flows a
• the air-gas fuel mixture is ignited at the outlet of the perforated plates, to form very small flames which ensure the heating of the ceramic hob on which the cookware can be placed.
• each of the burners is ensured by one or more electrodes associated with this burner when the electrodes are energized by the corresponding electronic circuit. Otherwise,
• this electronic circuit makes it possible to apply a current in the ionized part of the flame normally formed at the outlet of the corresponding burner and to measure the intensity of this current in order to detect a possible extinction of the burner.
• the electronic circuit associated with this burner automatically controls the closing of a solenoid valve placed in the gas supply circuit of this burner and which also regulates the burner when the latter is on. .
• the gas-ceramic hobs made in this way have certain drawbacks, mainly due to the need to associate an electron circuit with each of the burners. This leads in particular to give the hob a large size and a high cost.
• the use of relatively complex electronic systems increases the risk of device breakdowns and makes adjustments relatively delicate.
• the relatively complex structure of existing appliances is mainly due to the fact that it has not been possible until now to install a pilot light near each of the burners of the vitro- gas-heated ceramics, since the space between the three-ceramic radiant plate which receives the kitchen utensils and the burners is a space in which the oxygen necessary for combustion is practically absent.
• the subject of the invention is precisely a gas-heated vitro-ceramic hob, the original design of which enables it to simplify the electronic cir ⁇ cuit, which leads to a substantial reduction in its size and cost while increasing notably its reliability and by facilitating the adjustments.
• the cooking table according to the invention uses an auxiliary burner, forming a burner, the structure of which is comparable to that of the main burners of the cooking table. More specifically, it is proposed in accordance with the invention a vitro-ceramic hob, heated with gas, comprising:
• At least one main burner placed below the ceramic hob and comprising at least a first perforated plate, made of refractory material, a first mixing chamber placed below said plate, and first means for injecting a air-gas fuel mixture in this chamber; - A main gas supply circuit of the means * i nj ect i on;
• the ignition means comprise an auxiliary burner, forming a veil, opening at least partially above the main burner and comprising a second perforated plate, made of refractory material, a second adjacent mixing chamber to the second wafer, and second means for injecting the air-gas fuel mixture into this.
• the ignition means further comprising an auxiliary gas supply circuit of the second injection means.
• the main circuit and the auxiliary circuit are connected to a gas inlet pipe through the same tap which includes closing means actuated automatically when a flame absence signal is emitted. by a flame detector placed in front of the auxiliary burner.
• a regulating device with adjustable temperature controls a solenoid valve placed in the main circuit.
• This regulating device comprises for example a thermostat mounted on a movable member not fixed to the ceramic hob, so that the thermostat is in contact with the latter.
• the perforated plate of the auxiliary burner opens immediately above the perforated plate of the main burner, in a plane facing the first injection means.
• the hob comprises two main burners opening out in the same horizontal plane and supplied with gas by the same main circuit comprising a bifurcat on, and a single auxiliary burner having two ends which- open immediately above the perforated plate of the main burners.
• the single figure schematically illustrates a ceramic hob, heated with gas.
• a ceramic hob heated with gas.
• the two main burners 10a and 10b as well as the auxiliary burner 12 are placed below a horizontal ceramic-glass plate 14, on which the kitchen utensils to be heated can be placed.
• the vitro-ceramic plate 14 is fixed by its peripheral edge on a frame 16 which is only very partially shown in the figure.
• This chassis 16 provides support for the ceramic-glass plate 14 and is used to house the main burners 10a and 10b as well as the auxiliary burner 12.
• the intermediate space between the vi-ro-ceramic plate - only 14 and The burners do not communicates with the outside only through an orifice (not shown) formed at the rear of the ceramic hob, for the discharge of burnt gases.
• the two main burners 10a and 10b are identical and have a top view in the form of two rectangles whose long sides are parallel and separated by a relatively narrow interval.
• the burner 10a comprises one or more horizontal perforated plates 18a, made of a refractory material such as a ceramic, in which the micro holes 20a are formed.
• This perforated plate 18a which in this case has a rectangular shape, is placed above a mixing chamber 22a, delimited by ai lelles by a body 24a which closes the chamber 22a and supports the perforated plate 18a.
• the body 24a of each of the burners is itself supported by the chassis 16.
• the mixing chamber 22a is supplied with an air-gas combustible mixture by an intake tube 26a which internally has a venturi tube, which allows the introduction of the fresh air entrained by the inlet of gas into the venturi. , and mixes.
• This intake tube 26a opens into the chamber 22a in a substantially horizontal direction, parallel to the long side of the rectangle formed by the perforated plate 18a. More specifically, the intake tube 26a opens into the chamber 22a below a distribution grid 28a which has perforations 30a by which the aii-gas mixture introduced by the tube 26a in the chamber 22a is distributed sensi ⁇ uniformly uniform over the entire surface of the perforated plate 18a.
• a gas injector At the entrance to each of the intake tubes 26a and 26b of the main burners 10a and 10b is placed a gas injector. These injectors are illustrated diagrammatically at 32a and 32b in the figure. The injectors 32a and 32b are placed at the ends of two branches 34a and 34b of a common main circuit 34. This main circuit 34 communicates with a gas supply pipe 36 through a tap 38 allowing interruption the gas supply to the main circuit 34.
• Each of the two branches 34a and 34b of the cooked circuit 34 comprises a solenoid valve 40a, 40b making it possible to supply the main burners 10a and 10b, respectively.
• each of the solenoid valves 40a and 40b is electrically connected to an adjustable temperature regulation device comprising a thermostat 42a, 42b, as well as an adjustment button 43a, 43b of this thermostat, placed on the face front of the cooktop.
• the electrical connection between each of the electromagnets 40a and 40b and the ther ⁇ mostat 42a, 42b which corresponds to it is provided by an electrical conductor 44a, 44b.
• each of the thermostats 42a and 42b is normally in contact with the underside of the ceramic-glass plate 14, in a location situated above the burner 10a, 10b corresponding.
• the two thermostats are mounted on movable members (not shown) not attached to the ceramic-glass plate 14, which facilitates replacement.
• the ignition of each of the main burners 10a and 10b is provided by the common auxiliary burner 12 which plays the role of a pilot burner.
• this auxiliary burner 12 has a structure similar to that of the main burners 10a and 10b, while being of reduced dimensions compared to the latter.
• the auxiliary burner 12 comprises a perforated plate 46, made of a refractory material such as a ceramic, and in which are formed micro-holes similar to micro-holes 20a, 20b of plates 18a, 18b.
• the plate 46 has an elongated rectangular shape and it is arranged vertically, so as to open at its ends above each of the main burners 10b and, in its central part, opposite the space separating the main burners. More precisely, the microholes formed in the perforated plate 46 open out into a plane which is oriented substantially perpen ⁇ dicularly in the direction according to which the fuel air-gas mixture enters the chambers 22 of the main burners by the intake tubes 26a. and 26b, close to the sides of the burners 10a and 10b opposite the intake tubes 26a and 26b, so that the fuel mixture can be ignited as quickly as possible by the flames normally present at the outlet of the auxiliary burner 12.
• the auxiliary burner 12 also comprises, behind the perforated plate 46, a mixing chamber (not shown) delimited by an auxiliary burner body 48 supported by the frame 16 of the apparatus.
• An inlet tube 50 of the air-gas fuel mixture in the mixing chamber delimited by the auxiliary burner body 48 opens into this chamber, for example in front of the perforated plate 46 as illustrated in the figure.
• This intake tube 50 has internally, like the intake tubes 26a and 26b, the shape of a venturi tube. It allows air to be introduced into the mixing chamber when gas is in ected at the inlet of the tube 50 by an inverter 52 placed at the end of an auxiliary gas supply circuit 54 .
• this auxiliary circuit 54 is connected to the gas inlet pipe 36 through the same tap 38 as the main circuit 34.
• the auxiliary burner 12 opens in its central part in front of a thermocouple 56 which is connected to the tap 38 by an electrical conductor 58.
• the thermocouple 56 sends an electrical signal which keeps the safety valve (not shown) of tap 38 open.
• the user opens the valve 38, which has the immediate effect of injecting a fuel air-gas mixture into the auxiliary burner 12 and igniting this mixture at the outlet. of the perforated plate 46 using any known means (not shown).
• the thermocouple 56 sends to the net 38 an electrical signal now open the supply of gas to the main circuit 34.
• the regulating valves 40a and 40b are then normally closed since the temperature adjustment buttons 43a, 43b which are on the front face of the device have normally been returned to their closed position at the end of their previous use.
• the device is therefore in its standby position, in which an immediate immediate ignition of one and / or the other of the burners 10a and 10b can be carried out.
• This ignition is achieved by acting on the temperature adjustment buttons 43a, 43b associated with the thermostats 42a and 42b, so as to open the electro valves 40a and 40b until the displayed temperature is obtained.
• the foregoing description clearly shows the particularly simple, space-saving and inexpensive nature of the hob conforming to the invention. This simplicity also has the consequence of increasing reliability compared to existing cooktops comprising complex electronic circuits.
• the safety function is ensured here directly by the tap 38, connected for this purpose to the flame detection thermocouple 56.
• the electromagnetic valves 40a and 40b therefore only have a regulating function for the main burners associated with them.
• the main burners 10a and 10b, as well as the auxiliary burner 12 are atmospheric burners with a high rate of primary aeration which have a high flame temperature favoring a fast ignition.
• the particular arrangement of the auxiliary burner 12 and of the intake tubes 26a and 26b suppresses the ignition delay, a homogeneous distribution of the flames of each of the main burners being however ensured by the distribution grids 28.
• the invention is not limited to the embodiment which has just been described by way of example, but covers all its variants.
• the hob according to the invention could have only one main burner associated with an auxiliary burner for forming a pilot light.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Gas Burners (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=9417980

Family Applications (1)

Country Status (5)

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Family Cites Families (3)

• 1991
  • 1991-10-16 FR FR9112762A patent/FR2682742B1/fr not_active Expired - Fee Related
• 1992
  • 1992-10-15 CA CA002098111A patent/CA2098111A1/fr not_active Abandoned
  • 1992-10-15 WO PCT/FR1992/000975 patent/WO1993008427A1/fr not_active Application Discontinuation
  • 1992-10-15 JP JP5507491A patent/JPH06506293A/ja active Pending
  • 1992-10-15 EP EP19920923839 patent/EP0562109A1/fr not_active Withdrawn

Non-Patent Citations (1)

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