EP0505714B1 - Dispositif de commande pour un brûleur de gaz avec un ventilateur pour l'alimentation d'air de combustion - Google Patents

Dispositif de commande pour un brûleur de gaz avec un ventilateur pour l'alimentation d'air de combustion Download PDF

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Publication number
EP0505714B1
EP0505714B1 EP92102550A EP92102550A EP0505714B1 EP 0505714 B1 EP0505714 B1 EP 0505714B1 EP 92102550 A EP92102550 A EP 92102550A EP 92102550 A EP92102550 A EP 92102550A EP 0505714 B1 EP0505714 B1 EP 0505714B1
Authority
EP
European Patent Office
Prior art keywords
gas
temperature
control
air
combustion air
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.)
Expired - Lifetime
Application number
EP92102550A
Other languages
German (de)
English (en)
Other versions
EP0505714A3 (en
EP0505714A2 (fr
Inventor
Franz Dipl.-Ing. Schmuker
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0505714A2 publication Critical patent/EP0505714A2/fr
Publication of EP0505714A3 publication Critical patent/EP0505714A3/de
Application granted granted Critical
Publication of EP0505714B1 publication Critical patent/EP0505714B1/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
    • 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
    • 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
    • F23N2225/00—Measuring
    • F23N2225/04—Measuring pressure
    • F23N2225/06—Measuring pressure for determining flow
    • 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
    • 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
    • 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 is based on a control device for gas burners with a blower for supplying combustion air Opening cross section is fixed unchangeable.
  • the gas volume flow is controlled depending on the conveyed air volume flow, but it is not taken into account that the density and thus the oxygen mass of the air volume flow is dependent on its temperature and can therefore also adversely affect the quality of combustion.
  • the ratio of the combustion air mass to the fuel gas mass must be kept constant. With a constant combustion gas temperature and a variable combustion air temperature, however, this cannot be achieved with a fixed throttle orifice, because this cannot compensate for the temperature-dependent change in density of the air volume flow.
  • the combustion air is heated in a recuperator downstream of a measuring orifice controlling the gas control valve.
  • a measuring orifice is installed in the fuel gas line downstream of the gas control valve and the gas pressure behind this measuring orifice is fed back to the gas control valve as a correction signal.
  • the temperature of the combustion air upstream of the measuring orifice provided in the combustion air line is also not taken into account, in spite of an increased outlay in terms of apparatus, so that here too a constant excess of air cannot be maintained at different combustion air temperatures.
  • the object of the invention is to make the control variable derived by means of the setpoint generator also dependent on the temperature of the air volume flow. This object is achieved by a control device with the features of claim 1.
  • the arrangement according to the invention with the characterizing features of claim 1 has the advantage that, with a corresponding design of the setpoint generator and the gas control valve, the excess air can be adjusted to the optimum value over the entire controlled power range with automatic consideration of the combustion air temperature.
  • the setpoint generator for the gas control valve is a control pressure orifice in the combustion air line that generates differential pressure, the effective cross section of which is controlled as a function of temperature.
  • the arrangement can be such that the cross section increases with increasing temperature of the air volume flow and thereby the control pressure difference in In terms of lowering the setpoint of the gas control valve is reduced.
  • the flow resistance of the control pressure orifice also decreases, so that the air volume flow also changes in the desired sense compared to the gas volume flow due to this effect.
  • the effective cross section of the control pressure orifice can advantageously be influenced by at least one control flap which is coupled to a temperature-sensitive actuator acted upon by the air volume flow.
  • a simple arrangement results if a bimetal element is provided as an actuator for the control flap.
  • the bimetal element can itself be designed as a control flap and attached directly to the panel.
  • a bellows filled with expansion liquid or, for example, a wax expansion element can also be provided.
  • the measuring location can be located away from the actuator.
  • the temperature of the combustion air can also be detected by electronic means that act on an electromechanical actuator, such as a magnet or motor.
  • a control pressure orifice has an uncontrolled main opening and at least one temperature-controlled secondary opening.
  • This is expediently assigned a control flap which is designed directly as a bimetal element.
  • the control characteristic can be adapted to the requirements of the respective application by appropriately selecting the dimensions of the control openings. If two or more bimetallic elements or control flaps are arranged, the control characteristic can also be adapted by means of stepped prestressing of the bimetallic elements.
  • control device can be used both in systems or devices with forced draft burners and in devices with atmospheric gas burners which are provided with a fan to support the supply of combustion air.
  • FIG. 1 shows a schematic overall view of the burner device for a gas-heated water heater
  • FIG. 2 shows the side view of a control pressure orifice of the device according to FIG. 1
  • FIG. 3 shows a section along the line III-III in FIG. 2.
  • the burner device has a fan 10 for supplying combustion air, the speed of which is controlled in accordance with the heat requirement.
  • the fan 10 conveys the combustion air into a channel 12, into which a gas line 16 supplying the fuel gas opens at the point 14.
  • the channel 12 leads into a distribution chamber 18 of a premix burner 20, from which the fuel-air mixture passes through a perforated plate 22 to the combustion zone 24 of the premix burner 20, evenly distributed.
  • the combustion takes place in a combustion chamber 26 which is arranged between the premix burner 20 and a heat exchanger for the water to be heated, which heat exchanger is no longer shown.
  • the control pressure orifice 30 derives a differential pressure from the air volume flow in the channel 12, which is transmitted to the gas pressure regulator 32 as a control variable via lines 34, 36.
  • the control pressure orifice 30 and the gas pressure regulator 32 are designed in such a way that a constant excess of air in the fuel-air mixture results over a predetermined power range of the premix burner 20 for a predetermined normal value of the combustion air temperature.
  • the control pressure orifice 30 is also designed according to the invention so that it also detects the temperature of the combustion air and controls the setpoint of the gas pressure regulator 32 depending on the temperature so that there is a constant excess of air even at different temperatures of the combustion air.
  • the control pressure orifice 30 is provided, in addition to a main opening 38 with an unchangeable opening cross section, with a secondary opening 40, the opening cross section of which can be changed by a control flap 42 which is adjustable as a function of temperature.
  • the control flap 42 is designed as a bimetallic strip which is attached directly to the control pressure orifice 30 and is thus exposed to the temperature of the combustion air.
  • the openings 38, 40 in the control pressure orifice 30 and the control flap 42 are dimensioned or designed and coordinated with one another such that the ratio of air mass to gas mass is approximately the same at all temperatures of the combustion air occurring in practice within a predetermined performance range of the premix burner 20. so that the excess air is almost constant in this power range.

Landscapes

  • 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)

Claims (7)

  1. Dispositif de commande d'un brûleur à gaz équipé d'un ventilateur fournissant l'air comburant, d'un générateur de valeur de consigne (30) en aval du ventilateur et fournissant une grandeur de commande à partir du débit volumique d'air, pour une soupape de régulation de gaz (32) qui, à l'intérieur d'une plage de puissance prédéterminée du brûleur, commande le rapport de mélange entre le gaz combustible et l'air comburant, dans le sens d'une optimisation de la combustion, caractérisé en ce que le générateur de valeur de consigne (30) de la soupape de régulation de gaz (32) détecte également la température de l'air comburant et commande la valeur de consigne en fonction de la température, pour qu'avec une température croissante de l'air comburant, la proportion volumique en gaz combustible diminue par rapport au volume d'ensemble du mélange gaz combustible/air et inversement.
  2. Dispositif de régulation selon la revendication 1, caractérisé en ce que le générateur de valeur de consigne de la soupape de régulation de gaz (32) est un diaphragme de pression de commande (30) générant une différence de pression, et il comporte une conduite d'air comburant (12) aboutissant dans le brûleur à gaz (20), et dont la section efficace est commandée en fonction de la température.
  3. Dispositif de commande selon la revendication 2, caractérisé en ce que la section efficace du diaphragme de pression de commande (30) est influencée par au moins un volet de commande (42) couplé à un organe de réglage sensible à la température et sollicité par le débit volumique d'air.
  4. Dispositif de commande selon la revendication 3, caractérisé en ce que l'organe de réglage (42) sensible à la température est un élément bimétallique.
  5. Dispositif de commande selon la revendication 4, caractérisé en ce que l'élément bimétallique (42) constitue lui-même le volet de commande.
  6. Dispositif de commande selon l'une des revendications 2 à 5, caractérisé en ce que le diaphragme de pression de commande (30) comporte une ouverture principale (38) non commandée et au moins une ouverture auxiliaire commandée en température.
  7. Dispositif de commande selon l'une des revendications précédentes, caractérisé en ce que la soupape de régulation de gaz (32) est un régulateur de pression de gaz à commande par différence de pression.
EP92102550A 1991-03-26 1992-02-15 Dispositif de commande pour un brûleur de gaz avec un ventilateur pour l'alimentation d'air de combustion Expired - Lifetime EP0505714B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4109841 1991-03-26
DE4109841A DE4109841C2 (de) 1991-03-26 1991-03-26 Regelvorrichtung für Gasbrenner mit einem Gebläse zum Zuführen von Verbrennungsluft

Publications (3)

Publication Number Publication Date
EP0505714A2 EP0505714A2 (fr) 1992-09-30
EP0505714A3 EP0505714A3 (en) 1993-03-03
EP0505714B1 true EP0505714B1 (fr) 1996-01-24

Family

ID=6428195

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92102550A Expired - Lifetime EP0505714B1 (fr) 1991-03-26 1992-02-15 Dispositif de commande pour un brûleur de gaz avec un ventilateur pour l'alimentation d'air de combustion

Country Status (3)

Country Link
EP (1) EP0505714B1 (fr)
DE (2) DE4109841C2 (fr)
PT (1) PT100296B (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4343306A1 (de) * 1993-12-17 1995-06-22 Gastechnic Prod Vertriebges Verfahren und Vorrichtung zur Regelung des Druckes in einer Gasleitung
EP0724117B1 (fr) 1995-01-30 1998-07-08 Landis & Gyr Technology Innovation AG Dispositif de régulation pour un brûleur à soufflant à gaz
DE29504705U1 (de) 1995-03-24 1996-07-25 Robert Bosch Gmbh, 70469 Stuttgart Regelvorrichtung für einen Brenner mit einem Gebläse für die Verbrennungsluft
DE19510425C2 (de) * 1995-03-24 1999-05-27 Bosch Gmbh Robert Verfahren und Vorrichtung zur Regelung eines Heizgerätes
DE19538947C2 (de) * 1995-10-19 1998-11-26 Webasto Thermosysteme Gmbh Fahrzeugheizgerät
DE19711140A1 (de) * 1997-03-18 1998-06-04 Bosch Gmbh Robert Verfahren zum Betreiben eines mit einem Brennstoff-Luftgemisch gespeisten Brenners
NL1006559C2 (nl) * 1997-07-11 1999-01-12 Vries Metaal Bv Regeling van brandstof-toevoer aan een verwarmingstoestel.
DE19853573A1 (de) * 1998-11-20 2000-05-25 Bosch Gmbh Robert Heizgerät
DE19943612B4 (de) * 1999-09-11 2004-07-15 Robert Bosch Gmbh Verfahren zum Betreiben eines Gasbrenners mit modulierend geregelter Brennerleistung
DE10000653C2 (de) * 2000-01-11 2002-06-27 Bosch Gmbh Robert Gasheizgerät mit pneumatisch geregeltem Vormischbrenner
DE10119598C2 (de) * 2001-04-21 2003-10-02 Bosch Gmbh Robert Vorrichtung zum Mischen von Gas und Luft für ein Gasheizgerät
DE10303081B3 (de) * 2003-01-27 2004-07-29 Webasto Thermosysteme International Gmbh Heizgerät mit einer Einrichtung zum Verändern des Brennstoff-/Brennluftgemisches
US9528712B2 (en) * 2012-11-05 2016-12-27 Pat Caruso Modulating burner system

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2607286C3 (de) * 1976-02-23 1979-03-22 Tuezelestechnikai Kutatointezet, Miskolc (Ungarn) Luftmengensteuerung fur Feuerstatten
DE2708858C2 (de) * 1977-03-01 1986-04-24 Caloric Gesellschaft für Apparatebau mbH, 8032 Gräfelfing Regeleinrichtung für einen Brenner für fließfähige Brennstoffe
DE2735719A1 (de) * 1977-08-08 1979-02-15 Tuezelestechnikai Kutatointez Luftmengensteuerung fuer feuerstaetten
DE3006683A1 (de) * 1980-02-22 1981-08-27 G. Kromschröder AG, 4500 Osnabrück Regelvorrichtung fuer gasbrenner
DE3105862A1 (de) * 1981-02-18 1982-09-09 Stiebel Eltron Gmbh & Co Kg, 3450 Holzminden Gas-geblaesebrenner
DE3125513A1 (de) * 1981-06-29 1983-01-13 Siemens AG, 1000 Berlin und 8000 München "verfahren zum betrieb einer vergasungsbrenner/heinzkesselanlage"
DE3238682A1 (de) * 1982-10-19 1984-04-19 Kutzner, Luitpold, 8031 Maisach Absperreinrichtung im abgaszug einer feuerstaette
DE3812697A1 (de) * 1988-04-16 1989-12-28 Programmelectronic Eng Ag Verfahren zur reduzierung der stoergroessenwirkung bei geblaesebrenneranlagen und geblaesebrenneranlage
JPH1114617A (ja) * 1997-06-24 1999-01-22 Kdk Corp 液体試料用試験片及びその製造方法

Also Published As

Publication number Publication date
DE4109841C2 (de) 1994-06-09
EP0505714A3 (en) 1993-03-03
EP0505714A2 (fr) 1992-09-30
DE4109841A1 (de) 1992-10-01
DE59205137D1 (de) 1996-03-07
PT100296A (pt) 1994-04-29
PT100296B (pt) 1999-07-30

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