EP0036613B1 - Dispositif de régulation pour un échauffeur à eau ou air à combustion gazeuse pouvant être commandé par un capteur de température - Google Patents

Dispositif de régulation pour un échauffeur à eau ou air à combustion gazeuse pouvant être commandé par un capteur de température Download PDF

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Publication number
EP0036613B1
EP0036613B1 EP81101973A EP81101973A EP0036613B1 EP 0036613 B1 EP0036613 B1 EP 0036613B1 EP 81101973 A EP81101973 A EP 81101973A EP 81101973 A EP81101973 A EP 81101973A EP 0036613 B1 EP0036613 B1 EP 0036613B1
Authority
EP
European Patent Office
Prior art keywords
air
gas
control valve
pressure regulator
burner
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
EP81101973A
Other languages
German (de)
English (en)
Other versions
EP0036613A1 (fr
Inventor
Hendrikus Berkhof
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.)
Honeywell BV
Original Assignee
Honeywell 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
Priority claimed from DE3010737A external-priority patent/DE3010737A1/de
Priority claimed from DE19803044678 external-priority patent/DE3044678A1/de
Application filed by Honeywell BV filed Critical Honeywell BV
Publication of EP0036613A1 publication Critical patent/EP0036613A1/fr
Application granted granted Critical
Publication of EP0036613B1 publication Critical patent/EP0036613B1/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
    • 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
    • F23N5/025—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using electrical or electromechanical 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
    • F23N1/025—Regulating fuel supply conjointly with air supply using electrical or electromechanical 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
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/02—Air or combustion gas valves or dampers
    • F23N2235/06—Air or combustion gas valves or dampers 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
    • F23N2237/00—Controlling
    • F23N2237/16—Controlling secondary air

Definitions

  • the invention relates to a control device according to the preamble of claim 1, as is known for example from GB-PS 1 235 891.
  • a control device for optimal use of the fuel supplied to a burner, not only must the fuel supply be regulated as a function of the required heat, but also the combustion air supply must be adapted to the respective fuel quantity in order to achieve optimal combustion.
  • a spring-loaded diaphragm drive is connected to the outlet line leading to the burner of a gas control valve controlled by the temperature sensor and controls an air flap in the combustion air supply duct. The more gas that is fed to the burner, the more the flap opens, thereby increasing the amount of combustion air supplied by a fan.
  • said membrane drive controls the speed of the blower motor via a brake and in this way the combustion air supply.
  • a device for controlling the supply of gas and air to an infrared burner in which an air flap is installed in the combustion air duct.
  • This is, on the one hand, under the influence of a pressure regulator that keeps the pressure in the duct constant and, on the other hand, is acted upon by a servo motor controlled by the temperature sensors.
  • the air flows through an orifice into a mixing chamber, to which the fuel gas is also fed via a nozzle.
  • the aim is that the air pressure upstream of the orifice and the gas pressure upstream of the nozzle are the same.
  • the air duct is connected via a branch line to the control chamber of a constant pressure regulator, which influences a valve which is switched into the gas line.
  • a device for mixing gas and air for generating a heating gas in which the gas reaches a jet pump under driving pressure, which is equipped with an air intake and a Venturi tube for mixing the air with the gas.
  • the venturi tube opens into a mixing chamber.
  • a second jet pump is also provided, the input of which is connected to a compressed air generator and which also conveys an additional air quantity into the mixing chamber.
  • the mixing chamber is provided with heating gas outlet connections which lead into a gas supply network.
  • the amount of air sucked in can be adjusted manually by means of an air flap arranged in the intake port. Since a city gas network is supplied with a heating gas / air mixture from the common mixing chamber, of which only a uniform composition is required, without requiring adaptation to different quantities, a common regulation of both jet pumps is neither provided nor necessary here.
  • US-A 2193240 shows a mixing device for fuel gas and air, with the aid of which a gas mixture of constant calorific value is to be generated and maintained.
  • the throttle bodies of an air valve and a gas valve are rigidly coupled to one another and are controlled together by the output signal of a differential pressure regulator that measures the differential pressure at the gas valve.
  • the differential pressure at the gas valve and the differential pressure at the air valve are fed to a differential pressure comparator, the transmission ratio of which can be changed by the output signal of a calorific value measuring device connected to the mixture line and whose output signal controls a second air valve upstream of the air valve in such a way that a predetermined ratio of the two differential pressures is maintained .
  • a consumption-dependent, e.g. B. temperature-dependent, regulation of the amount of gas mixture is also not provided here.
  • the invention is concerned with the task to achieve a simultaneous control of gas supply and combustion air supply with water supply or air heaters with gas supply via an injector air which simultaneously sucks in combustion air, in such a way that even with changing heat requirements and thus changing fuel supply always that optimal fuel / air mixture is fed to the burner.
  • This object is solved by the features of claim 1.
  • a servo pressure regulator is used, the advantage being achieved that only relatively small gas or suction air flows can be processed by both the gas control valve and the air quantity control element, while the primary air and most of the Se secondary air is fed to the burner by suction of the injector nozzles (Venturi nozzles).
  • FIG. 1 shows the gas valve together with the servo pressure regulator and the air control valve with an upstream fan
  • FIG. 2 shows as a consumer a gas-fired boiler, for example for a central heating system
  • the drive chamber 31 of a servo pressure-controlled air control valve 32 is connected to the chamber 19 of the servo pressure regulator via a line 20.
  • the closing body 33 is supported by the membrane 35 via a pin 34 and is biased in the closing direction by a spring 36.
  • the inlet 37 of the air control valve is connected to a compressed air generator in the form of a fan 38, while the sensor 40 of a flow switch 41 is arranged in the outlet 30. Its normally open contact, which is closed by the air flow, lies in the excitation circuit of the closing solenoid valve 4.
  • Fig. 2 shows as a consumer a heat exchanger 52 surrounded by a closed housing 51, the heated water of which passes via the outlet 53 to one or more radiators.
  • a main burner 54 heats the heat exchanger 52, a pilot burner 55 being connected to the pilot burner connection 65 of the gas control device and a thermocouple 56 monitoring the pilot flame to the magnet insert 14 of the ignition safety device.
  • the combustion gases leave the housing 51 through a vent 57.
  • the inlet 58 of the main burner 54 is opposed by an injector nozzle 59, via which gas flows into the main burner from the outlet 5 of the gas control valve. Due to the jet effect of the nozzle 59, the gas stream simultaneously draws in primary air, which is fed to the main burner 54 as combustion air.
  • the housing 51 also has an inlet 60 for secondary air, which is opposed by a further injector nozzle 61. It is fed with compressed air by the air control valve 32 and, due to its jet effect, also draws in additional combustion air and presses it into the interior of the housing 51, where it is available to the main burner 54 in order to achieve as complete a combustion as possible. Otherwise the housing 51 is closed.
  • the arrangement is such that as the amount of gas at the outlet 5 of the gas control device increases, the amount of compressed air let through by the air control valve 32 also increases and, because of the jet effect of the two nozzles 59 and 61, as much primary or secondary air is fed to the main burner 54 as to one complete and optimal combustion of the amount of gas supplied is required.
  • the amount of gas let through from the gas control valve to the nozzle 59 is controlled with the aid of the servo pressure regulator 10 as a function of the temperature monitored with the aid of the temperature sensor 11.
  • the solenoid valve 7, 8 switches over and thus blocks the connection between the chambers 9 and 19, so it turns out that the connection of the air control valve 32 to the chamber 19 is advantageous in that, by separating it from the chamber 9 when Closing the valve 8, the closing time of the main valve is not delayed by the additional volume of the drive chamber 31. The latter is rather separated from the volume of the chamber 3, so that the pressure therein can be quickly reduced via the channel 6, the valve 8 and the channel 26 to the outlet side and the main gas valve 1 closes.
  • the inlet opening 60 is significantly smaller than the secondary air slots of conventional boilers because the majority of the secondary air is sucked in by the jet effect of the air nozzle 61. If this jet effect ceases, only an insignificant amount of air flows through the inlet 60.
  • a modified embodiment is shown in broken lines, in which the air control valve 32 is omitted and instead a pneumatic-electrical converter 42 is connected to the control air line 20. It is fed, for example, with alternating mains voltage and supplies at its output a direct current for the drive motor 43 of the blower 38 that is proportional to the pneumatic input signal in terms of its current intensity.
  • the blower speed and thus the speed of the blower 38 also increase Air volume to, which results in a synchronous gas and air volume control.
  • the conversion of the pneumatic input signal from the converter 42 into the motor speed-controlling signal can take place in a known manner with the aid of a phase control or a pulse length control.
  • a further embodiment of the invention results if the boiler 51 according to FIG. 2 is connected to the control device according to FIG. 3.
  • the servo pressure controller 10 does not act on the gas control device 67, but rather on the air control valve 72.
  • the amount of gas is then tracked to the amount of air supplied.
  • the embodiment according to FIG. 3 also has the advantage that the servo pressure regulator does not work with gas but with air and consequently no gas can escape in the event of any leaks. This makes it possible to manufacture the servo pressure regulator from less demanding materials, for example from plastic. The same applies to the air control valve in both cases.
  • Another advantage of the arrangement according to FIG. 3 is that the flow switch 40, 41 can be dispensed with. In this embodiment, the gas valve 67 can only open when the fan 38 is in operation and thus an air flow is present.
  • An adjustable throttle 73 which is arranged between the air control valve 32 or 72 on the one hand and the further injector nozzle 61 on the other hand, enables the setting of a desired gas / air ratio and thus an air excess sufficient for good combustion.
  • the compressed air source 38 only has to deliver a relatively small amount of air.
  • the fan 38 would have to convey about 10 m 3 of air.
  • the blower 38 itself only has to deliver about 0.5 m 3 . It is also advantageous that fluctuations in the supply pressure are not only corrected for the gas supply, but this also applies equally to the 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)

Claims (6)

1. Dispositif de régulation pour un échauffeur (51) à eau ou air à combustion gazeuse pouvant être commandé par un capteur de température (11), avec une soupape de régulation (1-5) pour l'admission du gaz ainsi qu'un élément de régulation (31-39; 42, 43) commandé de façon concomittante pour l'admission de l'air de combustion, caractérisé par les points suivants:
a) un régulateur de pression d'asservissement (10) égalise la pression à la sortie (5 ou 39) de la soupape de régulation de gaz (1-5) ou de l'élément de régulation du débit d'air (31-39) avec une valeur nominale déterminée par le capteur de température (11), et gouverne au moyen de sa pression de sortie non seulement la commande (2-4) de la soupape de régulation (1-5) mais encore la commande (31, 34, 35, 36; 43) de l'élément régulateur du débit d'air (31-36; 42,43);
b) la sortie (5) de la soupape de régulation de gaz (27) est connectée à une buse d'injection (59) disposée en face de l'entrée (58) du brûleur (54), et qui aspire également l'air primaire pour le brûleur;
c) le brûleur (54) et une surface échangeuse de chaleur qu'il chauffe (52) sont entourés par l'enceinte fermée (51), qui présente une admission d'air secondaire (6) ainsi qu'un échappement des gaz brûlés (57);
d) à une seconde buse d'injection (51) aspirant l'air secondaire en fonctionnement, et disposé en face de l'admission d'air secondaire (60) est raccordé, en tant qu'élément régulateur, une source d'air sous pression (38, 43, 32), dont l'entrée de commande (44; 45) est reliée au régulateur de pression d'asservissement (10).
2. Dispositif der régulation selon la revendication 1, caractérisé en ce qu'entre le régulateur de pression d'asservissement (10) et le montage d'alimentation du moteur de soufflerie (43) est monté un convertisseur (42) pneumatique/élec- trique.
3. Dispositif de régulation selon la revendication 1, dans lequel la source d'air sous pression susceptible d'être régulée est constituée d'une soufflerie (38) et d'une soupape de régulation d'air (32) montée en aval, caractérisé en ce que le régulateur de pression d'asservissement (10) est disposé sur le boîtier de la soupape de régulation de gaz (27) et que l'enceinte de membrane (31) de la soupape de régulation d'air (32) est raccordé par une conduite de pression de commande (20) au régulateur de pression d'asservissement (10) (fig. 1).
4. Dispositif de régulation selon la revendication 1, caractérisé en ce que le régulateur de pression d'asservissement (10) est monté sur le boîtier de la soupape de régulation d'air (32) et l'enceinte de membrane (3) de la soupape de régulation de gaz (27) est raccordé par une conduite de pression de commande (20) au régulateur de pression d'asservissement (10) (fig. 3).
5. Dispositif de régulation selon l'une des revendications 1 à 6, caractérisé en ce qu'entre la source d'air sous pression (38; 32; 72) et l'autre buse d'injection (61) est monté un clapet réglable (73).
6. Dispositif selon une des revendications 1 à 5, caractérisé en ce que la soupape de régulation de gaz (1-14) et l'élément régulateur de mélange d'air (32) sont disposées dans le même boîtier.
EP81101973A 1980-03-20 1981-03-17 Dispositif de régulation pour un échauffeur à eau ou air à combustion gazeuse pouvant être commandé par un capteur de température Expired EP0036613B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3010737A DE3010737A1 (de) 1980-03-20 1980-03-20 Gasregelgeraet fuer brenner
DE3010737 1980-03-20
DE19803044678 DE3044678A1 (de) 1980-11-27 1980-11-27 Regeleinrichtung fuer brenner
DE3044678 1980-11-27

Publications (2)

Publication Number Publication Date
EP0036613A1 EP0036613A1 (fr) 1981-09-30
EP0036613B1 true EP0036613B1 (fr) 1984-06-06

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Application Number Title Priority Date Filing Date
EP81101973A Expired EP0036613B1 (fr) 1980-03-20 1981-03-17 Dispositif de régulation pour un échauffeur à eau ou air à combustion gazeuse pouvant être commandé par un capteur de température

Country Status (3)

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EP (1) EP0036613B1 (fr)
DE (1) DE3163945D1 (fr)
DK (1) DK148726C (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3114866A1 (de) * 1981-04-13 1982-11-04 Honeywell B.V., Amsterdam Gasbefeuerter wasser- oder lufterhitzer
DE3114954A1 (de) * 1981-04-13 1982-11-04 Honeywell B.V., Amsterdam Regeleinrichtung fuer einen gasbefeuerten wasser- oder lufterhitzer
DE3114942A1 (de) * 1981-04-13 1982-10-28 Honeywell B.V., Amsterdam Regeleinrichtung fuer den gasbefeuerten heizkessel einer warmwasser-heizungsanlage
IT1274622B (it) * 1994-08-17 1997-07-18 Integra Srl Gruppo valvolare per caldaie a gas

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2193240A (en) * 1937-10-25 1940-03-12 Cutler Hammer Inc Method of and apparatus for controlling mixing of combustible gases
DE1031924B (de) * 1953-10-30 1958-06-12 Georg Hegwein Sicherheitsvorrichtung fuer Gasfeuerungsanlagen
FR1118768A (fr) * 1953-12-01 1956-06-11 Combustion Eng Perfectionnements apportés aux dispositifs de contrôle et de réglage de l'alimentation des foyers de chaudières en charbon pulvérisé et en air comburant
FR1430281A (fr) * 1965-01-19 1966-03-04 Cem Comp Electro Mec Perfectionnements aux dispositifs de commande et de sécurité pour installations de brûleurs à gaz
NL7811831A (nl) * 1978-12-04 1980-06-06 Itho B V Regelinrichting voor een brander.

Also Published As

Publication number Publication date
DE3163945D1 (en) 1984-07-12
DK148726C (da) 1986-09-22
DK124681A (da) 1981-09-21
DK148726B (da) 1985-09-09
EP0036613A1 (fr) 1981-09-30

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