EP0275568A1 - Hot water apparatus operating through gas combustion and provided with an air supply fan and a modulating gas/air control - Google Patents

Hot water apparatus operating through gas combustion and provided with an air supply fan and a modulating gas/air control Download PDF

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Publication number
EP0275568A1
EP0275568A1 EP87200097A EP87200097A EP0275568A1 EP 0275568 A1 EP0275568 A1 EP 0275568A1 EP 87200097 A EP87200097 A EP 87200097A EP 87200097 A EP87200097 A EP 87200097A EP 0275568 A1 EP0275568 A1 EP 0275568A1
Authority
EP
European Patent Office
Prior art keywords
gas
air
membrane
conduit
appliance
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Withdrawn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
EP87200097A
Other languages
German (de)
French (fr)
Inventor
Johannes Albertus Hendrikus Willemsen
Dirk Ten Hoeve
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.)
Furigas Assen BV
Original Assignee
Furigas Assen BV
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 Furigas Assen BV filed Critical Furigas Assen BV
Priority to EP87200097A priority Critical patent/EP0275568A1/en
Publication of EP0275568A1 publication Critical patent/EP0275568A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F23N1/027—Regulating fuel supply conjointly with air supply using mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/06—Ventilators at the air intake
    • F23N2233/08—Ventilators at the air intake with variable speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/20—Membrane valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2239/00—Fuels
    • F23N2239/04—Gaseous fuels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel

Definitions

  • the invention relates to a hot water appliance operating through gas com­bustion, e.g. a gas heater or central heating apparatus, comprising a gas supply conduit towards one or more burners of the appliance, said conduit containing a membrane operated valve, the cross-section of which is controlled through a control signal and comprising a discharge conduit for the combustion gases, an air supply conduit being connected to the gas supply conduit, the gas appliance being closed from the air present in the room in which the appliance is positioned, a fan being included in the air supply conduit or in the combustion gas discharge conduit.
  • a hot water appliance operating through gas com­bustion e.g. a gas heater or central heating apparatus, comprising a gas supply conduit towards one or more burners of the appliance, said conduit containing a membrane operated valve, the cross-section of which is controlled through a control signal and comprising a discharge conduit for the combustion gases, an air supply conduit being connected to the gas supply conduit, the gas appliance being closed from the air present in the room in which the appliance is positioned, a fan being included in
  • Legal rules usually require at present that the combustion sustaining air for the burner or burners is not induced from the room in which the appliance is positioned, but directly from outside that room.
  • the appliance is provided with a fan in the air supply conduit or in the discharge conduit for the combustion gases. This fan may supply the air directly to the burner.
  • a modu­lating flame control of the burner is desirable. This means that the burner emits more or less heat per time unity in order to permit keeping the room temperature and the hot water temperature constant dependent of the out­side temperature or the required domestic water quantity respectively.
  • the invention aims at carrying out said air control together with the gas control.
  • control signal controls the number of revolutions of the fan and a control orifice is provided in the air supply conduit, both chambers of an air pressure control membrane being connected to said conduit at both sides of the orifice, the membrane being mechanically connected to the membrane of the gas pressure membrane valve.
  • the advantage thereof is that a direct coupling exists between the air and gas quantities, so that no backfeed is required and no dangerous situations may arise.
  • the hot water appliance e.g. a gas heater for heating water or a central heating apparatus or a combination appliance
  • a gas supply conduit 2 extends in sealed manner through the appliance wall towards one or more burners 3, the housing of the appliance 1 having a discharge conduit 4 for combustion gases. For the rest the housing of the appliance 1 is completely closed.
  • Gas may be supplied through a conduit 5, containing a restriction or orifice 17 and connected to the conduit 2, a gas pressure control 6 having a membrane 7 being provided in said conduit 5. Also the air supply conduit 7 is connected to the conduit 2, said air supply conduit extending from outside the wall 9 of the room.
  • a fan 10 is provided in the conduit 8 and the drive motor (not shown) of said fan is controlled by a thermostat 11 provided in the positioning room or by a hot water tap valve (not shown). Beyond the fan 10 as seen in the air flow direction, an orifice 12 or similar restriction is provided which causes the generation of a pressure difference along this restriction when the fan 10 is operating.
  • Conduits 13 and 14 respectively are connected at both sides of the orifice 12 to both sides of an air pressure control membrane 15. Said membrane 15 is connected through a connection rod 16 or different connection mechanism to the membrane 7 of the gas pressure control 6.
  • the appliance operates as follows, that, if the thermostat 11 is used, a control signal for producing heat in connection with the decreasing or too low temperature in the room, in which the temperature has to be controlled, said signal operates the fan 10 for operation with a higher or lower number of revolutions, whereby air, having a predetermined pressure is caused to flow in the direction towards the burner 3. Due to the pressure difference, which is established along the orifice 12, the air pressure membrane 15 is displaced and by means of the rod 16 also the gas pressure membrane 7 is displaced, so that gas is supplied to the conduit 5. The mixture of air and gas further flows in the conduit 2 to­wards the burners. The area of the membrane is computed such that therewith, also with modulating gas pressure control, always a correct combustion ratio is obtained.
  • the thermostat 11 issues a control signal for more heat when the fan 10 is rotating already and the burners 3 are burning, e.g. if the thermostat is adjusted to a higher value. In that case the number of revolutions of the fan 10 is increased, whereby also an increased pressure difference along the orifice 12 is established and the gas supply is adapted to the increased air supply.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)

Abstract

For such appliances there is a present requirement that the combustion air is obtained through a fan directly from outside the positioning room of the appliance. Since for a central heating installation one desires a modulating burner flame control in order to approximate the desired room temperature as continuously as possible, then the gas supply and the air supply should be mutually adapted in order to obtain a high burner efficiency.
The invention achieves this by means of an air pressure membrane to which a gas pressure control membrane is mechanically coupled.

Description

  • The invention relates to a hot water appliance operating through gas com­bustion, e.g. a gas heater or central heating apparatus, comprising a gas supply conduit towards one or more burners of the appliance, said conduit containing a membrane operated valve, the cross-section of which is controlled through a control signal and comprising a discharge conduit for the combustion gases, an air supply conduit being connected to the gas supply conduit, the gas appliance being closed from the air present in the room in which the appliance is positioned, a fan being included in the air supply conduit or in the combustion gas discharge conduit.
  • Legal rules usually require at present that the combustion sustaining air for the burner or burners is not induced from the room in which the appliance is positioned, but directly from outside that room. For that purpose the appliance is provided with a fan in the air supply conduit or in the discharge conduit for the combustion gases. This fan may supply the air directly to the burner.
  • In so-called combination appliances, namely a central heating installation, simultaneously producing hot water for domestic use, a modu­lating flame control of the burner is desirable. This means that the burner emits more or less heat per time unity in order to permit keeping the room temperature and the hot water temperature constant dependent of the out­side temperature or the required domestic water quantity respectively.
  • Whith an appliance of the type as mentioned above also the number of revolutions of the fan and therewith the supplied air for combustion have to be controlled, because otherwise the burner efficiency considerably decreases or even the burner will not start at all.
  • The invention aims at carrying out said air control together with the gas control.
  • This is achieved according to the invention in that the control signal controls the number of revolutions of the fan and a control orifice is provided in the air supply conduit, both chambers of an air pressure control membrane being connected to said conduit at both sides of the orifice, the membrane being mechanically connected to the membrane of the gas pressure membrane valve.
  • The advantage thereof is that a direct coupling exists between the air and gas quantities, so that no backfeed is required and no dangerous situations may arise.
  • The invention will be further elucidated below with reference to the drawing showing an example of an operation diagram for an appliance accor­ding to the invention.
  • In the figure the hot water appliance, e.g. a gas heater for heating water or a central heating apparatus or a combination appliance, is indi­cated with the reference number 1. A gas supply conduit 2 extends in sealed manner through the appliance wall towards one or more burners 3, the housing of the appliance 1 having a discharge conduit 4 for combustion gases. For the rest the housing of the appliance 1 is completely closed.
  • Gas may be supplied through a conduit 5, containing a restriction or orifice 17 and connected to the conduit 2, a gas pressure control 6 having a membrane 7 being provided in said conduit 5. Also the air supply conduit 7 is connected to the conduit 2, said air supply conduit extending from outside the wall 9 of the room. A fan 10 is provided in the conduit 8 and the drive motor (not shown) of said fan is controlled by a thermostat 11 provided in the positioning room or by a hot water tap valve (not shown). Beyond the fan 10 as seen in the air flow direction, an orifice 12 or similar restriction is provided which causes the generation of a pressure difference along this restriction when the fan 10 is operating. Conduits 13 and 14 respectively are connected at both sides of the orifice 12 to both sides of an air pressure control membrane 15. Said membrane 15 is connected through a connection rod 16 or different connection mechanism to the membrane 7 of the gas pressure control 6.
  • The appliance operates as follows, that, if the thermostat 11 is used, a control signal for producing heat in connection with the decreasing or too low temperature in the room, in which the temperature has to be controlled, said signal operates the fan 10 for operation with a higher or lower number of revolutions, whereby air, having a predetermined pressure is caused to flow in the direction towards the burner 3. Due to the pressure difference, which is established along the orifice 12, the air pressure membrane 15 is displaced and by means of the rod 16 also the gas pressure membrane 7 is displaced, so that gas is supplied to the conduit 5. The mixture of air and gas further flows in the conduit 2 to­wards the burners. The area of the membrane is computed such that therewith, also with modulating gas pressure control, always a correct combustion ratio is obtained.
  • It is also possible that the thermostat 11 issues a control signal for more heat when the fan 10 is rotating already and the burners 3 are burning, e.g. if the thermostat is adjusted to a higher value. In that case the number of revolutions of the fan 10 is increased, whereby also an increased pressure difference along the orifice 12 is established and the gas supply is adapted to the increased air supply.

Claims (1)

1. Hot water appliance operating through gas combustion, e.g. a gas heater or a central heating apparatus, provided with a gas supply conduit towards one or more burners of the appliance, in which a membrane operated valve is included, the flow cross-section of which is adjusted through a control signal, and provided with a conduit for discharge of the combustion gases, an air supply conduit being connected to the gas supply conduit, the gas appliance being closed to the air in the room in which the appliance is positioned, a fan being included in said air supply conduit or in the combustion gas discharge conduit, characterized in that the control signal (11) controls the number of revolutions of the fan (8) and an orifice (12) or similar restriction is provided in the air supply conduit (8), both chambers of an air pressure membrane (15) being connected to the conduit (8) at both sides of the orifice, the membrane (16) being mechanically connected to the membrane of the membrane operated gas pressure valve (7).
EP87200097A 1987-01-23 1987-01-23 Hot water apparatus operating through gas combustion and provided with an air supply fan and a modulating gas/air control Withdrawn EP0275568A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP87200097A EP0275568A1 (en) 1987-01-23 1987-01-23 Hot water apparatus operating through gas combustion and provided with an air supply fan and a modulating gas/air control

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP87200097A EP0275568A1 (en) 1987-01-23 1987-01-23 Hot water apparatus operating through gas combustion and provided with an air supply fan and a modulating gas/air control

Publications (1)

Publication Number Publication Date
EP0275568A1 true EP0275568A1 (en) 1988-07-27

Family

ID=8197571

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87200097A Withdrawn EP0275568A1 (en) 1987-01-23 1987-01-23 Hot water apparatus operating through gas combustion and provided with an air supply fan and a modulating gas/air control

Country Status (1)

Country Link
EP (1) EP0275568A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2639094A1 (en) * 1988-11-16 1990-05-18 Chaffoteaux Et Maury IMPROVEMENTS IN DEVICES FOR CONTROLLING AND ADJUSTING THE GAS SUPPLY OF THE BURNER OF A BOILER OR THE LIKE
EP0390964A2 (en) * 1989-04-07 1990-10-10 Honeywell B.V. Control device for gas burners
AT398622B (en) * 1992-04-21 1995-01-25 Vaillant Gmbh Method for controlling a blower-type burner
EP0644377A1 (en) * 1993-09-16 1995-03-22 Honeywell B.V. Control device for gas burners
GB2284473A (en) * 1993-11-08 1995-06-07 Vaillant Joh Gmbh & Co Fan-assisted burner
EP0887590A1 (en) * 1997-06-27 1998-12-30 Compagnie Europeenne Pour L'equipement Menager "Cepem" Total premixing type gas burner for domestic cooking

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3101897A (en) * 1960-12-29 1963-08-27 Suburban Appliance Company Control for burners
FR2324994A1 (en) * 1975-09-19 1977-04-15 Landis & Gyr Ag INSTALLATION OF GAS / AIR RATIO REGULATION IN THE POWER CONTROL OF BLOW AIR GAS BURNERS
GB2018970A (en) * 1978-04-17 1979-10-24 Matsushita Electric Ind Co Ltd Combustion control apparatus
FR2483051A1 (en) * 1980-05-26 1981-11-27 Hitachi Ltd CONTROL SYSTEM FOR FUEL SUPPLY
EP0110071A1 (en) * 1982-10-19 1984-06-13 Stordy Combustion Engineering Limited Flow regulating device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3101897A (en) * 1960-12-29 1963-08-27 Suburban Appliance Company Control for burners
FR2324994A1 (en) * 1975-09-19 1977-04-15 Landis & Gyr Ag INSTALLATION OF GAS / AIR RATIO REGULATION IN THE POWER CONTROL OF BLOW AIR GAS BURNERS
GB2018970A (en) * 1978-04-17 1979-10-24 Matsushita Electric Ind Co Ltd Combustion control apparatus
FR2483051A1 (en) * 1980-05-26 1981-11-27 Hitachi Ltd CONTROL SYSTEM FOR FUEL SUPPLY
EP0110071A1 (en) * 1982-10-19 1984-06-13 Stordy Combustion Engineering Limited Flow regulating device

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2639094A1 (en) * 1988-11-16 1990-05-18 Chaffoteaux Et Maury IMPROVEMENTS IN DEVICES FOR CONTROLLING AND ADJUSTING THE GAS SUPPLY OF THE BURNER OF A BOILER OR THE LIKE
EP0370863A1 (en) * 1988-11-16 1990-05-30 Chaffoteaux Et Maury Devices for controlling and regulating the gas supply of the burner of a boiler
EP0390964A2 (en) * 1989-04-07 1990-10-10 Honeywell B.V. Control device for gas burners
EP0390964A3 (en) * 1989-04-07 1990-12-27 Honeywell Bv Control device for gas burners
AT398622B (en) * 1992-04-21 1995-01-25 Vaillant Gmbh Method for controlling a blower-type burner
EP0644377A1 (en) * 1993-09-16 1995-03-22 Honeywell B.V. Control device for gas burners
US5520533A (en) * 1993-09-16 1996-05-28 Honeywell Inc. Apparatus for modulating the flow of air and fuel to a gas burner
GB2284473A (en) * 1993-11-08 1995-06-07 Vaillant Joh Gmbh & Co Fan-assisted burner
GB2284473B (en) * 1993-11-08 1998-02-18 Vaillant Joh Gmbh & Co Fan-assisted burner
EP0887590A1 (en) * 1997-06-27 1998-12-30 Compagnie Europeenne Pour L'equipement Menager "Cepem" Total premixing type gas burner for domestic cooking
FR2765313A1 (en) * 1997-06-27 1998-12-31 Europ Equip Menager TOTAL PREMIX GAS BURNER FOR DOMESTIC COOKING

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Inventor name: TEN HOEVE, DIRK

Inventor name: WILLEMSEN, JOHANNES ALBERTUS HENDRIKUS