EP3295085B1 - Cooktop - Google Patents

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Publication number
EP3295085B1
EP3295085B1 EP16739244.8A EP16739244A EP3295085B1 EP 3295085 B1 EP3295085 B1 EP 3295085B1 EP 16739244 A EP16739244 A EP 16739244A EP 3295085 B1 EP3295085 B1 EP 3295085B1
Authority
EP
European Patent Office
Prior art keywords
gas
orifices
air
cooktop
shutter
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.)
Active
Application number
EP16739244.8A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3295085A1 (en
Inventor
Rosalino Usci
Michele Marcantoni
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.)
Tre P Engineering Srl
Tre P Eng Srl
Original Assignee
Tre P Engineering Srl
Tre P Eng Srl
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Publication date
Application filed by Tre P Engineering Srl, Tre P Eng Srl filed Critical Tre P Engineering Srl
Publication of EP3295085A1 publication Critical patent/EP3295085A1/en
Application granted granted Critical
Publication of EP3295085B1 publication Critical patent/EP3295085B1/en
Active legal-status Critical Current
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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
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/62—Mixing devices; Mixing tubes
    • 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
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • F23D14/045—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with a plurality of burner bars assembled together, e.g. in a grid-like arrangement
    • 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
    • F23D14/34—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air
    • 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
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/60—Devices for simultaneous control of gas and combustion air
    • 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
    • F24C3/12—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
    • 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
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/14—Special features of gas burners
    • F23D2900/14641—Special features of gas burners with gas distribution manifolds or bars provided with a plurality of nozzles

Definitions

  • the present disclosure relates to valves for regulating the thermal power of gas burners of the blown or premix type.
  • the burners according to the present disclosure are suitable for serving as burners for gas cookers of cooktops.
  • stoichiometric mixture An air-gas mixture where the air and gas masses are in a mixture ratio (mixture titre) equal to the exact stoichiometric ratio STC for a complete combustion of the gas without residual oxygen is referred to as stoichiometric mixture.
  • a mixture poor in gas, that is to say with a mixture ratio > STC, i.e. with excess of air, is herein referred to as "lean" mixture.
  • a mixture with a slight excess of air is required compared to the STC ratio theoretically sufficient.
  • STC mixture stoichiometric titre mixture or "STC mixture” it is meant a mixture with that minimum slight excess of air necessary to ensure the complete combustion.
  • Premix burners are well known and widely used for example in the household boilers for room heating and instant generators of hot water. In such products a very wide and continuous power modulation is possible while still keeping the mixture to stoichiometric titre.
  • a single fan serves a single burner and the power modulation takes place by simultaneously changing, according to a predefined relation, fuel gas flow rate and combustion air.
  • AN2015A000041 discloses important improvements in the power regulation of a plurality of premix burners relating to gas cookers of a gas cooktop.
  • all such burners may be fed by a single fan; each burner provides for the possibility of modulation of its power at least in steps from a minimum to a maximum power while keeping in regular combustion conditions (that is, with STC mixture); the only one fan regulates its flow rate so as to feed each burner with the stoichiometric air flow rate needed to the power set at the moment.
  • any possible absolute spatial reference in this report such as the terms vertical/horizontal or lower/upper refers to the position in which the elements are shown in the figures while any relative spatial reference such as the terms previous/subsequent, upstream/downstream should be understood with reference to the direction of circulation of the flows of airforms.
  • Fig. 1 shows a cooktop PC with blown burners BRN which, by way of an example, are three and of identical characteristics but only because they actually want to show three different possible operating states of a single blown burner BRN, it being understood that such cooktop PC may comprise one or more of such blown burners BRN.
  • the figure shows the fan FAN that supplies with primary air said one or more blown burners BRN (hereinafter simply referred to as burners BRN) through an air duct 401.
  • burners BRN hereinafter simply referred to as burners BRN
  • the latter is part of a ramp 4 that comprises also a gas duct 402 that instead supplies the same burners BRN with the fuel gas.
  • the figure shows the possible known safety means comprising flame sensors FD that send flame presence or absence signals to a control unit SFT which, in turn, if necessary, provides for the opening/closing of a general shut-off solenoid valve SSV and/or shut-off solenoid valves SV of the single burners.
  • the figure also shows a possible control dashboard CC that has functional links, consisting in exchange of signals and/or input, with a possible command unit CMD which, in turn, has functional links with at least the valves 1 for the regulation of the power of the burners BRN in order to actuate them and/or know their status.
  • a possible control dashboard CC that has functional links, consisting in exchange of signals and/or input, with a possible command unit CMD which, in turn, has functional links with at least the valves 1 for the regulation of the power of the burners BRN in order to actuate them and/or know their status.
  • the fan FAN in addition to the possible functional link with the command unit CMD, as shown in figure, may have, additionally or alternatively, a functional link with a delivery pressure gauge of the same fan FAN. Such option is not shown in the figures.
  • the object of the invention is a feeding unit 1-4 comprising:
  • valves 1 for the regulation of the power according to the invention shall be referred to as mix valves 1.
  • the burner BRN which is a blown and preferably premix burner, is fed with an air-gas mixture that forms inside a mixing chamber 2 that is part of said mix valve 1.
  • the mixing chamber 2 is sealed towards the outside environment except for passages consisting of a mix outlet 201 connected from a mix pipe 202 to the burner BRN and air and gas inlets from corresponding air orifices 403 and gas orifices 404. From now on, by sealed mixing chamber 2 it is meant a mixing chamber 2 made sealed except for said passages 201, 403, 404.
  • the mix valve 1 provides for a plurality of shutter assemblies 3.
  • Each shutter assembly 3 comprises a shutter 301 capable of being piloted to two stable positions ON/OFF where;
  • the total power Ptot delivered at a given time by each burner BRN is equal to the sum of the partial powers Pp due to the shutters 301 in the ON position at that time and the maximum power Pmax of each burner BRN is obtained when all its shutters 301 are in the ON position.
  • said stable ON and OFF positions are obtained by the fact that in said shutter assembly 3 the shutter 301 is constrained to a stem 302 piloted by a coil 303 which, energized, brings the shutter 301 in the ON position in contrast with a compression spring 304 which, when the coil 303 is de-energized, keeps the shutter 301 in the OFF position.
  • the variation in steps of the power of a burner BRN is obtained by imposing the appropriate ON or OFF position to each shutter 301 of the plurality of shutter assemblies 3 which the mix valve 1 has.
  • the mix valve 1 is suitable for being mounted on a ramp 4:
  • each burner BRN to each type of gas and/or power provided is possible by mounting concentric tubes 413 and 414 of appropriate passage section although such interchangeability option is not shown in Figures 1 and 2 for graphical simplicity.
  • the cross section of the air duct 401 is sufficiently narrow to allow said air 403 and gas 404 orifices associated with each shutter 301 to be close enough to each other in order to make the simultaneous plugging thereof by the same shutter 301 constructively simple.
  • additional gas orifices 404" suitable for further types of gas GAS2 (for example, LPG) and to be used as an alternative to each other according to the type of gas available may also be provided, associated with each shutter assembly 3, in addition to first gas orifices 404' suitable for a first type of gas GAS1 (for example, natural gas).
  • the two gas ducts 402 are a first and a second gas duct, 402'/402", respectively, each dedicated to the only gas GAS1/GAS2, respectively, and each carrying exclusively the gas orifices 404'/404", respectively, specific to the gas GAS1/GAS2 to which it is dedicated.
  • the preferred solution to select the gas duct 402 dedicated to the gas in use provides that:
  • the ramp 4 is obtained from a profile of material having suitable physical and mechanical characteristics; in particular the ramp 4 is obtained from an aluminium alloy profile.
  • two guides 409 are provided (for example, obtained with the aid of two ribs 408) in which the appendices 102 of a foot 101 being part of the mix valve 1 can engage slidingly and by shape coupling. Geometry of the guides 409 and foot 101 are such as to ensure that the mixing chamber 2 may be sealed by suitable sealing members, once the positioning of the mix valve 1 has taken place.
  • such two ribs 408 may be locally interrupted so as to allow a bayonet coupling of the mix valve 1.
  • the bayonet coupling is a shape coupling which, as is known, provides, along special guides, an approach of a first and second element and then a relative sliding of the first relative to the second element where in this case first and second element are the mix valve 1 and the ramp 4.
  • the cited document AN2015A000041 teaches the criteria by which the speed of the fan FAN may be regulated when the ON/OFF state of all the shutters 301 present in the cooktop PC changes.
  • a control unit that knows the load/flow loss characteristic curves of the cooktop PC for every possible combination of the ON/OFF state of all the shutters 301 of the burners BRN but also knows, for inputs sent and/or signals received by the same burners BRN, the actual ON/OFF state and therefore it is able to change the rotation speed of the fan FAN bringing it to the value that knows as appropriate to that state.
  • command unit CMD knows in advance the possible effects of each change of the ON/OFF state requested to it through the control dashboard CC and may, simultaneously or slightly in advance on the ON/OFF state changes that it determines itself, intervene on the fan FAN by changing the speed thereof with the appropriate promptness and gradualness so that substantially the delivery pressure remains constant.
  • the predetermined speed imposed to the fan FAN may be inaccurate or not exactly reached for some reason.
  • the mix valve 1 lends itself to numerous piloting methods: the control dashboard CC and/or the command unit CMD are very useful but not necessary the mix valve 1 being able to be piloted directly and manually according to many known means while the preset value p.target of the pressure can be ensured independently with the said means that comprise a pressure gauge and a speed regulator of the fan FAN.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Gas Burners (AREA)
  • Regulation And Control Of Combustion (AREA)
EP16739244.8A 2015-05-13 2016-05-11 Cooktop Active EP3295085B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITAN2015A000060A ITAN20150060A1 (it) 2015-05-13 2015-05-13 Valvola per bruciatori premix
PCT/IB2016/000644 WO2016181212A1 (en) 2015-05-13 2016-05-11 Valve for premix burner

Publications (2)

Publication Number Publication Date
EP3295085A1 EP3295085A1 (en) 2018-03-21
EP3295085B1 true EP3295085B1 (en) 2020-08-19

Family

ID=53900890

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16739244.8A Active EP3295085B1 (en) 2015-05-13 2016-05-11 Cooktop

Country Status (3)

Country Link
EP (1) EP3295085B1 (it)
IT (1) ITAN20150060A1 (it)
WO (1) WO2016181212A1 (it)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201600118672A1 (it) * 2016-11-23 2018-05-23 Esa S P A Sistema di regolazione individuale di bruciatori
JP6756636B2 (ja) 2017-02-16 2020-09-16 パーパス株式会社 予混合装置、熱源装置および給湯装置
EP3617596B1 (en) 2018-08-28 2021-10-06 Ademco Inc. Method for operating a gas burner appliance
CN110425582B (zh) * 2019-07-31 2020-11-03 安徽冠东科技有限公司 一种旋转式燃气燃烧调节装置
JP7480467B2 (ja) * 2020-07-29 2024-05-10 株式会社ノーリツ 予混合装置およびこれを備えた燃焼装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016142770A2 (en) * 2015-03-11 2016-09-15 Tre P Engineering S.R.L. Gas domestic premixed ventilated hob

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1639115A (en) * 1924-07-10 1927-08-16 Gas Res Co Stove
US3033463A (en) * 1958-04-28 1962-05-08 Whirlpool Co Thermostatic control of gas range burners
DE4101260A1 (de) * 1991-01-17 1992-07-23 Ruhrgas Ag Stellorgan fuer die zweistufige leistungsregelung von gas-geblaesebrennern
US5209217A (en) * 1992-07-24 1993-05-11 Maytag Corporation Downdraft gas range with dual mode burner system
IT1307513B1 (it) * 1999-11-15 2001-11-06 Ind Polidoro A S P A Bruciatore di gas combustibile con emissioni a basso tenore di nox

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016142770A2 (en) * 2015-03-11 2016-09-15 Tre P Engineering S.R.L. Gas domestic premixed ventilated hob

Also Published As

Publication number Publication date
WO2016181212A1 (en) 2016-11-17
EP3295085A1 (en) 2018-03-21
ITAN20150060A1 (it) 2016-11-13

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