EP0724117A1 - Dispositif de régulation pour un brûleur à soufflant à gaz - Google Patents

Dispositif de régulation pour un brûleur à soufflant à gaz Download PDF

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Publication number
EP0724117A1
EP0724117A1 EP95114195A EP95114195A EP0724117A1 EP 0724117 A1 EP0724117 A1 EP 0724117A1 EP 95114195 A EP95114195 A EP 95114195A EP 95114195 A EP95114195 A EP 95114195A EP 0724117 A1 EP0724117 A1 EP 0724117A1
Authority
EP
European Patent Office
Prior art keywords
gas
valve
temperature
control device
spring
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.)
Granted
Application number
EP95114195A
Other languages
German (de)
English (en)
Other versions
EP0724117B1 (fr
Inventor
Alfred Hettel
Axel Obermann
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.)
Electrowatt Technology Innovation AG
Original Assignee
Landis and Gyr Technology Innovation AG
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 Landis and Gyr Technology Innovation AG filed Critical Landis and Gyr Technology Innovation AG
Publication of EP0724117A1 publication Critical patent/EP0724117A1/fr
Application granted granted Critical
Publication of EP0724117B1 publication Critical patent/EP0724117B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • F23N5/04—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using bimetallic elements
    • F23N5/047—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using bimetallic elements using mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/04—Measuring pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature
    • F23N2225/21—Measuring temperature outlet temperature
    • 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
    • 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
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/24—Valve details

Definitions

  • the invention relates to a control device for a gas fan burner according to the preamble of claim 1.
  • control devices are suitable, for example, for providing the gas intended for combustion and the amount of combustion air matched to it.
  • a control device for a gas fan burner of the type mentioned in the preamble of claim 1 is known from DE-A1-31 05 862.
  • a gas valve is guided by the pressure of the combustion air generated by a fan, so that, for example, a change in the speed of the fan with a corresponding change in the amount of air supplied to the burner also varies the amount of gas supplied. This enables roughly stoichiometric quantity control over the entire performance range.
  • the previously known solutions are not yet optimal with regard to a really stoichiometric combustion.
  • the fact that the temperature of the gas supplied to the combustion can also vary does not take into account. It is therefore necessary to take this influence into account if the lowest pollutant emissions are to be achieved.
  • the temperature of the combustible gas to be supplied to the combustion can fluctuate on the one hand because gas containers and gas supply lines are more or less exposed to the temperature of the environment. Often, however, the influence is even greater if the gas valve used to regulate the gas supply is installed directly on the boiler and is thus exposed to the radiant heat of the boiler and / or other heat-radiating components, for example a transformer of the automatic burner control unit.
  • the invention has for its object to further improve the regulation of the gas supply with a view to optimal stoichiometric combustion, so that there are lower pollutant emissions.
  • 1 means a gas control valve, by means of which the gas supply to a burner 2 is controlled.
  • the air required for combustion the supply of which is indicated by an arrow denoted by the letter L, is conveyed by a fan 3 through an air duct 4 to the burner 2.
  • the gas to be burned the supply of which is indicated by an arrow denoted by the letter G, is controlled in terms of quantity by the gas control valve 1.
  • the gas After passing through the gas control valve 1, the gas also reaches the burner 2 through a gas line 5.
  • the gas control valve 1 has a controllable opening cross section, which is formed by a valve seat 6 and a valve plate 7 movable relative thereto.
  • the valve plate 7 is connected to a tappet 8, one end of which is in contact with a membrane 9.
  • the membrane 9 forms the separation between an air chamber 10, which is connected via a control line 11 to the air duct 4, so that the air pressure on the air space-side surface of the membrane 9 is that which is generated by the fan 4 and which is a measure of how much Air is supplied to the burner 2.
  • the pressure that prevails in a chamber 12 acts on the opposite surface of the membrane 9.
  • This chamber 12 is connected via a connection 13 to an outlet chamber 14.
  • the outlet chamber 14 is connected to the gas line 5 leading to the burner 2.
  • the gas control valve 1 also has an inlet chamber 15 which is connected to a gas supply device, not shown.
  • the gas control valve 1 has an adjusting element 16 with which the pressure or quantity ratio of gas and air can be adjusted.
  • This adjusting element 16 which is also present in the prior art, is usually an adjusting screw.
  • This adjusting element 16 acts on a spring 17 which is supported on the one hand on the adjusting element 16 and on the other hand on the valve plate 7. Since the tappet 8 is connected to the valve plate 7 and the tappet 8 is supported on the diaphragm 9, the spring 17 also acts on the diaphragm 9.
  • a coupling member 18 is arranged between the adjusting element 16 and the spring 17.
  • This coupling member 18 is temperature sensitive, that is, it reacts to changes in temperature of the gas flowing through the outlet chamber 14 with dimensional changes. These dimensional changes result in a different preload of the spring 17.
  • the coupling member 18 can advantageously consist of a holder 19 and a bimetallic strip 20.
  • One side of the holder 19 is connected to the adjusting element 16, on the other side the one end of the bimetal strip 20 is fastened.
  • the free end of the bimetallic strip 20 acts against the spring 17.
  • the bimetallic strip 20 consists of thermal bimetell, ie of two metallic strips rolled onto one another, the two metals having a different coefficient of thermal expansion.
  • the bimetallic strip 20 is such that the metal with the greater coefficient of thermal expansion forms the side facing the spring 17.
  • the gas to be supplied to the combustion enters the gas control valve 1 through the inlet chamber 15.
  • the degree of opening of the gas control valve 1 determined by the opening cross-section, which is formed by the distance between the valve seat 6 and valve plate 7, a certain amount of gas flows from the inlet chamber 15 into the outlet chamber 14.
  • the degree of opening of the gas control valve 1 is influenced by the pressure in the air chamber 10, which is determined by the pressure in the air duct 4, and the pressure in the chamber 12, which is determined by the pressure in the outlet chamber 14.
  • the degree of opening becomes smaller or larger.
  • the underlying control principle is known.
  • the gas flowing through the outlet chamber 14 also flows around the coupling member 18, so that its temperature is determined by the temperature of the gas flowing through. Each change in temperature of the gas affects the coupling member 18. Whose temperature change is converted by the bimetallic strip 20 into a more or less large bias of the spring 17, which in turn is converted into a change in the pressure ratio between the air chamber 10 and the outlet chamber 14 via the action on the membrane 9 .
  • the teaching according to the invention can be clearly seen from the exemplary embodiment described.
  • the temperature of the gas flowing through the gas control valve 1 is detected by the coupling member 18.
  • the coupling member 18 experiences a change in dimension due to the temperature change, which is converted into a change in the effective throttle cross section.
  • the throttle cross section is, for example, the distance between the valve seat 6 and the valve plate 7.
  • the change in cross section takes place in the sense that the cross section is enlarged at a higher temperature of the gas and the cross section is reduced at a lower temperature.
  • the teaching of the invention can be implemented in a variety of ways.
  • This coupling member 18 is advantageously arranged between the adjusting element 16 and the spring 17.
  • a particularly simple and therefore advantageous embodiment is obtained if the bimetal element 20 is rigidly fixed on one side to the holder 19, while the free end of the bimetal element 20 presses on the first end of the spring 17, the second end of which presses on the valve plate 7.
  • the coupling member 18 is connected to the adjusting screw for the parallel displacement of the characteristic.
  • This adjustment screw is often referred to as a low-load adjustment device.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)
  • Feeding And Controlling Fuel (AREA)
EP95114195A 1995-01-30 1995-09-09 Dispositif de régulation pour un brûleur à soufflant à gaz Expired - Lifetime EP0724117B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH24395 1995-01-30
CH243/95 1995-01-30

Publications (2)

Publication Number Publication Date
EP0724117A1 true EP0724117A1 (fr) 1996-07-31
EP0724117B1 EP0724117B1 (fr) 1998-07-08

Family

ID=4182563

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95114195A Expired - Lifetime EP0724117B1 (fr) 1995-01-30 1995-09-09 Dispositif de régulation pour un brûleur à soufflant à gaz

Country Status (2)

Country Link
EP (1) EP0724117B1 (fr)
DE (1) DE59502756D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008047289A3 (fr) * 2006-10-19 2008-07-03 Gary Kenneth Diamond Soupape

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1425469A (en) * 1972-05-23 1976-02-18 Dunlop Ltd Temperature-dependent fuel flow regulators for burners
DE2607286A1 (de) * 1976-02-23 1977-09-01 Tuezelestechnikai Kutatointez Kombinierter luftmengenregler fuer feuerstaetten
DE3105862A1 (de) 1981-02-18 1982-09-09 Stiebel Eltron Gmbh & Co Kg, 3450 Holzminden Gas-geblaesebrenner
US4457694A (en) * 1981-04-04 1984-07-03 Chugai Ro Kogyo Co., Ltd. Automatic air-fuel ratio control apparatus
EP0183157A1 (fr) * 1984-11-29 1986-06-04 Karl Dungs GmbH & Co. Régulateur du rapport gaz/air
JPS6370022A (ja) * 1986-09-11 1988-03-30 Hitachi Zosen Corp 高炉ガス焚ボイラにおける高炉ガス発熱量補正装置
EP0450173A1 (fr) * 1990-04-04 1991-10-09 Landis & Gyr Betriebs AG Dispositif de régulation de mélange pour des brûleurs à gaz à mélange
DE4109841C2 (de) 1991-03-26 1994-06-09 Bosch Gmbh Robert Regelvorrichtung für Gasbrenner mit einem Gebläse zum Zuführen von Verbrennungsluft

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1425469A (en) * 1972-05-23 1976-02-18 Dunlop Ltd Temperature-dependent fuel flow regulators for burners
DE2607286A1 (de) * 1976-02-23 1977-09-01 Tuezelestechnikai Kutatointez Kombinierter luftmengenregler fuer feuerstaetten
DE3105862A1 (de) 1981-02-18 1982-09-09 Stiebel Eltron Gmbh & Co Kg, 3450 Holzminden Gas-geblaesebrenner
US4457694A (en) * 1981-04-04 1984-07-03 Chugai Ro Kogyo Co., Ltd. Automatic air-fuel ratio control apparatus
EP0183157A1 (fr) * 1984-11-29 1986-06-04 Karl Dungs GmbH & Co. Régulateur du rapport gaz/air
JPS6370022A (ja) * 1986-09-11 1988-03-30 Hitachi Zosen Corp 高炉ガス焚ボイラにおける高炉ガス発熱量補正装置
EP0450173A1 (fr) * 1990-04-04 1991-10-09 Landis & Gyr Betriebs AG Dispositif de régulation de mélange pour des brûleurs à gaz à mélange
DE4109841C2 (de) 1991-03-26 1994-06-09 Bosch Gmbh Robert Regelvorrichtung für Gasbrenner mit einem Gebläse zum Zuführen von Verbrennungsluft

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 012, no. 292 (M - 729) 10 August 1988 (1988-08-10) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008047289A3 (fr) * 2006-10-19 2008-07-03 Gary Kenneth Diamond Soupape

Also Published As

Publication number Publication date
DE59502756D1 (de) 1998-08-13
EP0724117B1 (fr) 1998-07-08

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