EP1285200A1 - Control device for gas burners - Google Patents

Control device for gas burners

Info

Publication number
EP1285200A1
EP1285200A1 EP01953944A EP01953944A EP1285200A1 EP 1285200 A1 EP1285200 A1 EP 1285200A1 EP 01953944 A EP01953944 A EP 01953944A EP 01953944 A EP01953944 A EP 01953944A EP 1285200 A1 EP1285200 A1 EP 1285200A1
Authority
EP
European Patent Office
Prior art keywords
valve
servo
control device
frequency
servo valve
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Withdrawn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
EP01953944A
Other languages
German (de)
French (fr)
Inventor
Wim Munsterhuis
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
Application filed by Honeywell BV filed Critical Honeywell BV
Publication of EP1285200A1 publication Critical patent/EP1285200A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/005—Regulating fuel supply using electrical or electromechanical means
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/20—Control of fluid pressure characterised by the use of electric means
    • G05D16/2093—Control of fluid pressure characterised by the use of electric means with combination of electric and non-electric auxiliary power
    • G05D16/2095—Control of fluid pressure characterised by the use of electric means with combination of electric and non-electric auxiliary power using membranes within the main valve
    • 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
    • F23N2235/14—Fuel valves electromagnetically operated
    • 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

Definitions

  • the invention relates to a control device for gas burners according to the preamble of claim 1.
  • Control devices for gas burners are well known from the prior art.
  • Known control devices for gas burners have a main valve, a servo valve and a servo controller, the servo controller being used according to the state of the art for setting the setpoint and regulating a gas outlet pressure.
  • modulation takes place in that a modulation coil acts on the servo controller, which is supplied with a variable current and changes the settings made on the servo controller.
  • the present invention is based on the problem of creating a novel control device for gas burners.
  • Figure 1 is a schematic diagram of a control device according to the invention in the closed position in cross section.
  • Fig. 2 is a schematic diagram of the control device according to the invention of Figure 1 in the open position also in cross section.
  • FIG. 4 shows another example of pulse width modulation.
  • Figure 1 shows a control device 10 according to the invention in the closed position.
  • a gas flow that flows into the control device in the area of an inlet 12 and leaves it in the area of an outlet 13 is regulated via a main valve 11.
  • the main valve 11 is formed by a valve body 14 which rests on a valve seat 15 in the closed position.
  • the valve body 14 is connected to a control membrane 16. In the closed position of the main valve 11, the valve body 14 is pressed against the valve seat 15 by a spring element 17.
  • a gas inlet chamber 18, which is arranged below the control membrane 16, is connected via a bore 19 to a servo gas chamber 20, which is positioned above the control membrane 16.
  • a servo valve 21 is also closed, in which position a valve body 22 of the servo valve 21 is pressed against a corresponding valve seat 23, namely by a spring element 27.
  • control device 10 has a servo controller 28, a valve body 29 of the servo controller 28 interacting with a corresponding valve seat 30.
  • the valve body 29 of the servo controller is connected to a diaphragm 31, on which a spring element 32 of a presetting device 33 of the servo controller 28 also engages.
  • the servo valve 21 is opened against the force of the spring element 27 via an actuator 24 assigned to the servo valve 21.
  • gas can flow out of the servo gas chamber 20 via corresponding bores 25 and 34 into a gas outlet chamber 26.
  • the pressure prevailing in the servo gas chamber 20 then decreases, and the gas pressure prevailing in the gas inlet chamber 18 lifts the valve body 14 of the main valve 11 from the valve seat 15.
  • the servo valve 21 is actuated via the actuator 24 depending on an upcoming heat request.
  • the actuator 24 for the servo valve 21 is frequency-modulated, namely pulse-width-modulated, in the present invention.
  • the servo valve 21 is either completely opened or completely closed with a certain frequency, the length of the on-cycles at a certain frequency making up the actual modulation.
  • the actuator 24 is accordingly designed as an on / off actuator 24.
  • the modulation coil acting on the servo drive and used according to the prior art can be omitted. Accordingly, in the invention, modulation takes place with the aid of the servo valve 21 or the actuator 24 and not via the servo controller 28.
  • the opening of the main valve 11 and thus the gas flow is determined by the length of the on-cycles of the pulse-width-modulated servo valve 21.
  • the frequency range that is typically available for modulation according to the invention is between 10 Hz and 30 Hz. Below a frequency of 10 Hz there are undesired disturbances in the output pressure. At a frequency above 30 Hz, the mechanical components of the servo valve 21 cannot follow the frequency.
  • FIG. 3 and 4 illustrate the modulation principle, for example for a frequency of 10 Hz, where T j is then 0.1 sec.
  • the so-called duty cycle is therefore 50%.
  • the degree or the measure of the load cycle determines the modulation and thus ultimately the opening of the main valve.
  • the load cycle is directly dependent on the heat requirement.

Abstract

The control device comprises a main valve (11) and a servo valve (21). The servo valve is used to regulate the opening of the main valve. According to the invention, the actuator (24) for the servo valve is frequency modulated and pulse-width modulated.

Description

Regeleinrichtung für Gasbrenner Control device for gas burners
Die Erfindung betrifft eine Regeleinrichtung für Gasbrenner gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a control device for gas burners according to the preamble of claim 1.
Regeleinrichtungen für Gasbrenner sind aus dem Stand der Technik hinlänglich bekannt. Bekannte Regeleinrichtungen für Gasbrenner verfügen über ein Hauptventil, ein Servoventil und einen Servoregler, wobei nach dem Stand der Technik der Servoregler der Sollwerteinstellung und der Regelung eines Gasausgangsdrucks dient. Bei Regeleinrichtungen nach dem Stand der Technik erfolgt eine Modulation dadurch, daß auf den Servoregler eine Modulationsspule einwirkt, der ein veränderlicher Strom zugeführt wird und die am Servoregler vorgenommene Einstellungen verändert.Control devices for gas burners are well known from the prior art. Known control devices for gas burners have a main valve, a servo valve and a servo controller, the servo controller being used according to the state of the art for setting the setpoint and regulating a gas outlet pressure. In control devices according to the prior art, modulation takes place in that a modulation coil acts on the servo controller, which is supplied with a variable current and changes the settings made on the servo controller.
Hiervon ausgehend liegt der vorliegenden Erfindung das Problem zu Grunde, eine neuartige Regeleinrichtung für Gasbrenner zu schaffen.Proceeding from this, the present invention is based on the problem of creating a novel control device for gas burners.
Dieses Problem wird durch eine Regeleinrichtung mit den Merkmalen des Anspruchs 1 gelöst.This problem is solved by a control device with the features of claim 1.
Weitere vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus der Beschreibung. Nachfolgend wird ein bevorzugtes Ausführungsbeispiel der Erfindung anhand der Zeichnung näher erläutert. In der Zeichnung zeigt:Further advantageous embodiments of the invention result from the description. A preferred exemplary embodiment of the invention is explained in more detail below with reference to the drawing. The drawing shows:
Fig. 1 eine Prinzipskizze einer erfindungsgemäßen Regeleinrichtung in Schließstellung im Querschnitt;Figure 1 is a schematic diagram of a control device according to the invention in the closed position in cross section.
Fig. 2 eine Prinzipskizze der erfindungsgemäßen Regeleinrichtung gemäß Fig. 1 in Öffhungsstellung ebenfalls im Querschnitt;Fig. 2 is a schematic diagram of the control device according to the invention of Figure 1 in the open position also in cross section.
Fig. 3 ein Beispiel einer Pulsweitenmodulation; und3 shows an example of pulse width modulation; and
Fig. 4 ein weiteres Beispiel einer Pulsweitenmodulation. Figur 1 zeigt eine erfindungsgemäße Regeleinrichtung 10 in Schließstellung. Über ein Hauptventil 11 wird ein Gasstrom, der in die Regeleinrichtung im Bereich eines Einlasses 12 einströmt und dieselbe im Bereich eines Auslasses 13 verläßt, geregelt. Das Hauptventil 11 wird gemäß Figur 1 von einem Ventilkörper 14 gebildet, der in Schließstellung auf einem Ventilsitz 15 aufliegt. Der Nentilkörper 14 ist mit einer Regelmembran 16 verbunden. In Schließstellung des Hauptventils 11 wird der Nentilkörper 14 von einem Federelement 17 gegen den Ventilsitz 15 gedrückt.Fig. 4 shows another example of pulse width modulation. Figure 1 shows a control device 10 according to the invention in the closed position. A gas flow that flows into the control device in the area of an inlet 12 and leaves it in the area of an outlet 13 is regulated via a main valve 11. According to FIG. 1, the main valve 11 is formed by a valve body 14 which rests on a valve seat 15 in the closed position. The valve body 14 is connected to a control membrane 16. In the closed position of the main valve 11, the valve body 14 is pressed against the valve seat 15 by a spring element 17.
Gemäß Figur 1 ist eine Gaseinlaßkammer 18, die unterhalb der Regelmembran 16 angeordnet ist, über eine Bohrung 19 mit einer Servogaskammer 20 verbunden, die oberhalb der Regelmembran 16 positioniert ist. Hierdurch herrscht in Schließstellung des Hauptventils 11 auf beiden Seiten der Regelmembran 16 derselbe Druck. In Schließstellung des Hauptventils 11 ist des weiteren ein Servoventil 21 geschlossen, wobei in dieser Position ein Ventilkörper 22 des Servoventils 21 gegen einen korrespondierenden Ventilsitz 23 gedrückt wird, nämlich von einem Federelement 27.According to FIG. 1, a gas inlet chamber 18, which is arranged below the control membrane 16, is connected via a bore 19 to a servo gas chamber 20, which is positioned above the control membrane 16. As a result, the same pressure prevails in the closed position of the main valve 11 on both sides of the control membrane 16. In the closed position of the main valve 11, a servo valve 21 is also closed, in which position a valve body 22 of the servo valve 21 is pressed against a corresponding valve seat 23, namely by a spring element 27.
Ferner verfügt die Regeleinrichtung 10 über einen Servoregler 28, wobei ein Ventilkörper 29 des Servoreglers 28 mit einem entsprechenden Ventilsitz 30 zusammenwirkt. Der Ventilkörper 29 des Servoreglers ist mit einer Membran 31 verbunden, an der ebenfalls ein Federelement 32 einer Voreinstelleinrichtung 33 des Servoreglers 28 angreift.Furthermore, the control device 10 has a servo controller 28, a valve body 29 of the servo controller 28 interacting with a corresponding valve seat 30. The valve body 29 of the servo controller is connected to a diaphragm 31, on which a spring element 32 of a presetting device 33 of the servo controller 28 also engages.
Soll nun das Hauptventil 11 der erfindungsgemäßen Regeleinrichtung 10 geöffnet werden, so wird das Servoventil 21 über einen dem Servoventil 21 zugeordneten Aktuator 24 gegen die Kraft des Federelements 27 geöffnet. In dem Fall, in dem das Servoventil 21 geöffnet wird, kann Gas aus der Servogaskammer 20 über entsprechende Bohrungen 25 und 34 in eine Gasauslaßkammer 26 abströmen. In diesem Fall nimmt dann der in der Servogaskammer 20 herrschende Druck ab, und der in der Gaseinlaßkammer 18 herrschende Gasdruck hebt den Ventilkörper 14 des Hauptventils 11 vom Ventilsitz 15 ab.If the main valve 11 of the control device 10 according to the invention is now to be opened, the servo valve 21 is opened against the force of the spring element 27 via an actuator 24 assigned to the servo valve 21. In the case in which the servo valve 21 is opened, gas can flow out of the servo gas chamber 20 via corresponding bores 25 and 34 into a gas outlet chamber 26. In this case, the pressure prevailing in the servo gas chamber 20 then decreases, and the gas pressure prevailing in the gas inlet chamber 18 lifts the valve body 14 of the main valve 11 from the valve seat 15.
Das Servoventil 21 wird abhängig von einer anstehenden Wärmeanforderung über den Aktuator 24 betätigt. Erfindungsgemäß wird bei der hier vorliegenden Erfindung der Aktuator 24 für das Servoventil 21 frequenzmoduliert, nämlich pulsweitenmoduliert, betrieben. Das Servoventil 21 wird mit einer bestimmten Frequenz entweder ganz geöffnet oder ganz geschlossen, wobei die Länge der Ein-Zyklen bei einer bestimmten Frequenz die eigentliche Modulation ausmacht. Der Aktuator 24 ist demnach als Ein/Aus-Aktuator 24 ausgebildet. Die nach dem Stand der Technik verwendete, auf den Servoregler einwirkende Modulationsspule kann entfallen. Bei der Erfindung erfolgt demnach eine Modulation mit Hilfe des Servoventils 21 bzw. des Aktuators 24 und nicht über den Servoregler 28. Die Öffnung des Hauptventils 11 und damit der Gasstrom wird durch die Länge der EinZyklen des pulsweitenmodulierten Servoventils 21 bestimmt.The servo valve 21 is actuated via the actuator 24 depending on an upcoming heat request. According to the present invention, the actuator 24 for the servo valve 21 is frequency-modulated, namely pulse-width-modulated, in the present invention. The servo valve 21 is either completely opened or completely closed with a certain frequency, the length of the on-cycles at a certain frequency making up the actual modulation. The actuator 24 is accordingly designed as an on / off actuator 24. The modulation coil acting on the servo drive and used according to the prior art can be omitted. Accordingly, in the invention, modulation takes place with the aid of the servo valve 21 or the actuator 24 and not via the servo controller 28. The opening of the main valve 11 and thus the gas flow is determined by the length of the on-cycles of the pulse-width-modulated servo valve 21.
Der Frequenzbereich, der nach der Erfindung typischerweise zur Modulation zur Verfügung steht, liegt zwischen 10 Hz und 30 Hz. Unterhalb einer Frequenz von 10 Hz ergeben sich ungewünschte Störungen des Ausgangsdrucks. Bei einer Frequenz von oberhalb 30 Hz können die mechanischen Bauelemente des Servoventils 21 der Frequenz nicht folgen.The frequency range that is typically available for modulation according to the invention is between 10 Hz and 30 Hz. Below a frequency of 10 Hz there are undesired disturbances in the output pressure. At a frequency above 30 Hz, the mechanical components of the servo valve 21 cannot follow the frequency.
Fig. 3 und Fig. 4 verdeutlichen das Modulationsprinzip z.B. für eine Frequenz von 10Hz, wobei Tj dann 0,1 sec. beträgt. Bei der in Fig. 3 gezeigten Modulation sind der Ein-Zyklus und der Aus-Zyklus jeweils gleichlang, T, = T3 = 0,05 sec. Der sogenannte Lastzyklus (duty cycle) beträgt also 50%. Bei der in Fig. 4 gezeigten Modulation bei einer Frequenz von 10Hz beträgt der Lastzyklus 10%, demnach ist T2 = 0,01 sec und T3 = 0,09 sec. Der Grad bzw. das Maß des Lastzyklus bestimmt die Modulation und damit letztendlich die Öffnung des Hauptventils. Der Lastzyklus ist von der Wärmeanforderung umittelbar abhängig. 3 and 4 illustrate the modulation principle, for example for a frequency of 10 Hz, where T j is then 0.1 sec. In the modulation shown in FIG. 3, the on cycle and the off cycle are each of the same length, T, = T 3 = 0.05 sec. The so-called duty cycle is therefore 50%. In the case of the modulation shown in FIG. 4 at a frequency of 10 Hz, the load cycle is 10%, accordingly T 2 = 0.01 sec and T 3 = 0.09 sec. The degree or the measure of the load cycle determines the modulation and thus ultimately the opening of the main valve. The load cycle is directly dependent on the heat requirement.
Bezugszeichenliste:LIST OF REFERENCE NUMBERS
10 Regeleinrichtung10 control device
11 Hauptventil11 main valve
12 Einlaß12 inlet
13 Auslaß13 outlet
14 Ventilkörper14 valve body
15 Ventilsitz15 valve seat
16 Regelmembran16 control membrane
17 Federelement17 spring element
18 Gasemlaßkammer18 gas release chamber
19 Bohrung19 hole
20 Servogaskammer20 servo gas chamber
21 Servoventil21 servo valve
22 Ventilkörper22 valve body
23 Ventilsitz23 valve seat
24 Aktuator24 actuator
25 Öffnung25 opening
26 Gasauslaßkammer26 gas outlet chamber
27 Federelement27 spring element
28 Servoregler28 servo drives
29 Ventilkörper29 valve body
30 Ventilsitz30 valve seat
31 Membran31 membrane
32 Federelement32 spring element
33 Voreinstelleinrichtung33 Presetting device
34 Bohrung 34 hole

Claims

Patentanspruch: Claim:
1. Regeleinrichtung für Gasbrenner, mit einem Hauptventil (11) und einem Servoventil (21), wobei über das Servoventil (21) die Öffnung des Hauptventils (11) geregelt wird, dadurch gekennzeichnet, daß ein Aktuator (24) für das Servoventil (21) frequenzmoduliert betrieben wird, derart, daß das Servoventil (21) einer Frequenz folgend öffnet und schließt.1. Control device for gas burners, with a main valve (11) and a servo valve (21), the opening of the main valve (11) being regulated via the servo valve (21), characterized in that an actuator (24) for the servo valve (21 ) is operated frequency-modulated such that the servo valve (21) opens and closes following a frequency.
2. Regeleinrichtung für Gasbrenner nach Anspruch 1, dadurch gekennzeichnet, daß die Frequenzmodulation eine Pulsweitenmodulation ist, derart, daß der Lastzyklus der Frequenz unmittelbar von einer Wärmeanforderung abhängig ist. 2. Control device for gas burners according to claim 1, characterized in that the frequency modulation is a pulse width modulation, such that the load cycle of the frequency is directly dependent on a heat requirement.
EP01953944A 2000-05-25 2001-05-18 Control device for gas burners Withdrawn EP1285200A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10026035 2000-05-25
DE10026035A DE10026035C2 (en) 2000-05-25 2000-05-25 Control device for gas burners
PCT/EP2001/005694 WO2001090648A1 (en) 2000-05-25 2001-05-18 Control device for gas burners

Publications (1)

Publication Number Publication Date
EP1285200A1 true EP1285200A1 (en) 2003-02-26

Family

ID=7643608

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01953944A Withdrawn EP1285200A1 (en) 2000-05-25 2001-05-18 Control device for gas burners

Country Status (5)

Country Link
US (1) US20040075070A1 (en)
EP (1) EP1285200A1 (en)
CA (1) CA2378308A1 (en)
DE (1) DE10026035C2 (en)
WO (1) WO2001090648A1 (en)

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Also Published As

Publication number Publication date
US20040075070A1 (en) 2004-04-22
WO2001090648A1 (en) 2001-11-29
DE10026035A1 (en) 2001-12-06
DE10026035C2 (en) 2002-06-27
CA2378308A1 (en) 2001-11-29

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