EP0015480B1 - Dispositif pour régler le mélange de chauffages au gaz - Google Patents

Dispositif pour régler le mélange de chauffages au gaz Download PDF

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Publication number
EP0015480B1
EP0015480B1 EP19800100938 EP80100938A EP0015480B1 EP 0015480 B1 EP0015480 B1 EP 0015480B1 EP 19800100938 EP19800100938 EP 19800100938 EP 80100938 A EP80100938 A EP 80100938A EP 0015480 B1 EP0015480 B1 EP 0015480B1
Authority
EP
European Patent Office
Prior art keywords
pressure
membrane
gas
line
transformer
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
Application number
EP19800100938
Other languages
German (de)
English (en)
Other versions
EP0015480A2 (fr
EP0015480A3 (en
Inventor
Gustav Ing.-grad. Niedergesäss
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.)
EON Ruhrgas AG
Original Assignee
Ruhrgas 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 Ruhrgas AG filed Critical Ruhrgas AG
Publication of EP0015480A2 publication Critical patent/EP0015480A2/fr
Publication of EP0015480A3 publication Critical patent/EP0015480A3/de
Application granted granted Critical
Publication of EP0015480B1 publication Critical patent/EP0015480B1/fr
Expired 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

Definitions

  • the invention relates to a device for keeping the mixing ratio of gas and combustion air constant, which are fed through separate lines to a forced draft burner with a pressure measuring point in one of the lines, a membrane-controlled pressure transducer connected to the pressure measuring point, which receives its working medium from one of the two lines and one of which measured pressure generated corresponding proportional pressure, and with a constant pressure regulator controlled by the proportional pressure in the other line.
  • a device of the type mentioned above is known for example from DE-OS 2834242. It works with a pressure transducer, the working medium of which acts on a constant pressure regulator in the gas line.
  • the pressure converter is also designed as a constant pressure regulator.
  • AT-B-196999 works with an equilibrium system, but this is preceded by a membrane-controlled pressure regulator, which also has the disadvantages specified in DE-OS 2834242, quite apart from the fact that external energy is required.
  • the object of the invention is accordingly to provide a device of the type mentioned at the outset which has great control accuracy.
  • the characterizing features of claim 1 serve to solve this problem.
  • Claims 2-4 characterize advantageous developments of the invention.
  • every slight deflection of the membrane of the pressure transducer leads to a corresponding actuation of the force switch, in such a way that the membrane deflection is immediately compensated for and eliminated. This eliminates the disadvantages of the known devices.
  • the device according to the invention has a high sensitivity.
  • This offers the advantageous possibility of applying a preferably small differential pressure supplied by the pressure measuring point to the membrane of the pressure transducer.
  • the pressure measuring point therefore provides a quantity measurement.
  • Such a quantity measurement known per se allows the preselected mixing ratio to be kept constant even if the operating conditions of a recuperator located between the pressure measuring point and the burner change. The latter is not possible with a simple pressure measurement, since this does not exactly reproduce the changes in throughput that result from the heating or cooling of the recuperator.
  • the ratio of the effective areas on the one hand of the membrane of the pressure transducer and on the other hand of the force switch can be preselected according to the respective requirements, advantageously also in such a way that the proportional pressure generated by the force switch is significantly higher than the pressure prevailing in the air line. So you can choose the gas pressure much higher than the air pressure.
  • the device according to the invention advantageously offers an extremely simple and exact possibility for changing the gear ratio.
  • the preload of the power switch and thus the relative height of the proportional pressure is preselected by the adjustment slide of the transmission lever, which works as a weight load.
  • Fig. 1 shows schematically an advantageous embodiment of the invention.
  • the combustion air supplied to the burner 5 by the fan 4 through the line 8 is heated in the recuperator 9.
  • a measuring plug 2 preferably in the form of a measuring orifice or nozzle, is installed in the combustion air line 8.
  • the differential pressure which arises at this measuring throttle is fed to the pressure transducer 1 via the lines 6 and 7.
  • the differential pressure is converted in the pressure converter 1 into a higher proportional pressure, which acts via the line 14 as a control variable on the gas pressure regulator 11 arranged in the gas line 10.
  • the line 12 serves to supply the aid for the pressure transducer.
  • the line 13 is used to discharge the aid, for. B. when scaling down.
  • FIG. 2 schematically shows a device according to the invention.
  • a pressure measuring point 3 is installed in the combustion air line 8 in front of the recuperator 9.
  • the pressure of the combustion air supplied by the blower 4 to the burner 5 is supplied to the pressure converter 1 via the line 6.
  • the pressure is converted into an increased proportional pressure, which acts via the line 14 as a control variable on the gas pressure regulator 11 arranged in the gas line 10.
  • the line 12 serves to supply the aid for the pressure transducer.
  • the line 13 serves to remove the aid.
  • Fig. 3 shows a longitudinal section through an example embodiment of the pressure transducer.
  • the membrane 16 is accommodated in the housing 15. If the flow-dependent differential pressure coming from the metering orifice 2 is to be converted into a proportional pressure as a control variable for the gas pressure regulator, the upper side of the membrane 16 via the line 6 and the opening 21 with the plus pressure and the lower side the membrane 16 via the line 7 and the opening 22 with the minus pressure of the orifice 2. If, instead of the differential pressure, the pressure in the combustion air line is used as a control variable, only the upper side of the membrane 16 and the line 6 and the opening 21 are subjected to this pressure. The opening 22 then serves as a breathing opening, ie the pressure of the outside air is present on the underside of the membrane.
  • Differential pressure or pressure are converted with the help of the membrane 16 into a force which causes a change in the position of the actuator 18 via the membrane plate 17.
  • the normal position of the actuator is determined by a correction and compensation device known per se, e.g. the compensation spring 19 shown in Fig. 3 set.
  • the force transmitted from the actuator 18 to the force switch 20 is converted into a proportional force.
  • a pneumatic force switch since the auxiliary means of this force switch, gas or air, can be taken directly from the gas or air line, so that no third-party work equipment is required.
  • the main components of the pneumatic force switch which is known per se, are a bellows 23 and an alternative control 24.
  • the auxiliary means is fed to the force switch 20 via the line 12.
  • the transmission ratio of the inlet pressure to the pressure which acts on the gas pressure regulator as a control variable, can either be changed in a smaller range approx. 1: 4 to 1: 7 by moving the adjustment slide 26 on the transmission lever 25 or by replacing the force switch 20 with a force switch corresponding effective cross-section if a significant change in the gear ratio is necessary, e.g. B. 1:20.
  • the above-described possibilities for changing the gear ratio can vary this within wide limits. Since the mode of operation of the pressure transducer according to the invention is based on a force comparison, the control range is large and the control deviations are significantly smaller than if the function is carried out by a path comparison. In addition, the pressure transducer is inexpensive to manufacture.

Claims (4)

1. Dispositif pour maintenir constant le rapport de mélange du gaz et de l'air comburant qui sont amenés par des tuyauteries séparées à un brûleur à ventilateur, comportant un point de mesure de pression dans l'une des tuyauteries, un transducteur de pression commandé par membrane, faisant suite au point de mesure de pression et qui reçoit son fluide de travail de l'une des deux tuyauteries et engendre une pression proportionnelle correspondant à la pression mesurée, et un régulateur à pression constante placé dans l'autre tuyauterie et commandé par la pression proportionnelle, caractérisé par le fait que la membrane (16) du transducteur de pression (1) est maintenue dans sa position d'équilibre par un convertisseur de force (20) commandé par soupape qui reçoit le fluide de travail et l'applique, sous la pression proportionnelle, au régulateur à pression constante (11).
2. Dispositif selon la revendication 1 caractérisé par le fait que la membrane (16) du transducteur de pression (1) peut être soumise à la pression différentielle fournie par le point de mesure de pression (2).
3. Dispositif selon l'une des revendications 1 et 2 caractérisé par le fait que la surface active du convertisseur de force (20) est plus petite que cell de la membrane (16) du transducteur de pression (1), ce dernier recevant son fluide de travail de la tuyauterie (10) à pression plus élevée.
Dispositif selon l'une des revendications 1 à 3 caractérisé par la présence, entre la membrane (16) du transducteur de pression (1) et le convertisseur de force (20), d'un levier démultiplicateur (25) muni d'un coulisseau de réglage (26) pour faire varier le rapport de démultiplication.
EP19800100938 1979-03-02 1980-02-26 Dispositif pour régler le mélange de chauffages au gaz Expired EP0015480B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19792908197 DE2908197C2 (de) 1979-03-02 1979-03-02 Vorrichtung zum Konstanthalten des Mischungsverhältnisses von Gas und Verbrennungsluft bei Gebläsebrennern
DE2908197 1979-03-02

Publications (3)

Publication Number Publication Date
EP0015480A2 EP0015480A2 (fr) 1980-09-17
EP0015480A3 EP0015480A3 (en) 1981-01-07
EP0015480B1 true EP0015480B1 (fr) 1984-06-20

Family

ID=6064302

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800100938 Expired EP0015480B1 (fr) 1979-03-02 1980-02-26 Dispositif pour régler le mélange de chauffages au gaz

Country Status (2)

Country Link
EP (1) EP0015480B1 (fr)
DE (1) DE2908197C2 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3009591A1 (de) * 1980-03-13 1981-09-17 G. Kromschröder AG, 4500 Osnabrück Regelvorrichtung zur regelung des mischungsverhaeltnisses von brenngas und luft bei gasbrennern
GB2165347A (en) * 1984-10-04 1986-04-09 British Gas Corp Burner air/gas ratio control
DE3545264A1 (de) * 1985-12-20 1987-06-25 Ruhrgas Ag Vorrichtung zur gemischregelung von gas und verbrennungsluft fuer gasfeuerungen
CH668825A5 (de) * 1986-01-28 1989-01-31 Landis & Gyr Ag Verfahren und vorrichtung zur gas-luft-mengenregelung fuer gasgeblaesebrenner.
CH676497A5 (en) * 1987-10-19 1991-01-31 Landis & Gyr Betriebs Ag Forced-draught gas-burner control - uses conduit pressure to regulate gas quantity
DE3911268A1 (de) * 1989-04-07 1990-10-11 Honeywell Bv Regeleinrichtung fuer gasbrenner
DE4231374A1 (de) * 1992-09-21 1994-03-24 Gastechnic Prod Vertriebges Verfahren und Vorrichtung zum Steuern eines Gasstromes
CN109442405B (zh) * 2018-12-26 2023-12-05 广州威茨热能技术有限公司 一种空燃比例混合器

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB443259A (en) * 1934-11-22 1936-02-25 James Keith Apparatus for effecting the proportional delivery of combustible and combustion-supporting media to furnaces and the like
AT196999B (de) * 1954-05-26 1958-04-10 Askania Werke Ag Einrichtung zum selbsttätigen Konstanthalten des Mengenverhältnisses zweier strömender Medien, insbesondere Gas-Warmluft-Gemischregler
DE2412720C3 (de) * 1974-03-16 1979-08-30 Gerlach-Werke Gmbh, 6650 Homburg Vorrichtung zur Regelung des Verhältnisses der Drücke in einer Gas- und einer Luftzuleitung für eine industrielle Feuerung
DE2834242A1 (de) * 1978-08-04 1980-02-14 Kromschroeder Ag G Gemisch-regeleinrichtung fuer gasgeblaesebrenner

Also Published As

Publication number Publication date
DE2908197C2 (de) 1985-08-22
DE2908197A1 (de) 1980-09-04
EP0015480A2 (fr) 1980-09-17
EP0015480A3 (en) 1981-01-07

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