EP1058060A1 - Arrangement de soupapes pour réguler la pression d'alimentation d'un gaz - Google Patents

Arrangement de soupapes pour réguler la pression d'alimentation d'un gaz Download PDF

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Publication number
EP1058060A1
EP1058060A1 EP99120258A EP99120258A EP1058060A1 EP 1058060 A1 EP1058060 A1 EP 1058060A1 EP 99120258 A EP99120258 A EP 99120258A EP 99120258 A EP99120258 A EP 99120258A EP 1058060 A1 EP1058060 A1 EP 1058060A1
Authority
EP
European Patent Office
Prior art keywords
valve
pressure
gas
modulation
unit according
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Withdrawn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
EP99120258A
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German (de)
English (en)
Inventor
Stefano Fandella
Filiberto Rimondo
Daniele Sacchi
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.)
Sit La Precisa SpA
Original Assignee
Sit La Precisa SpA
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 Sit La Precisa SpA filed Critical Sit La Precisa SpA
Publication of EP1058060A1 publication Critical patent/EP1058060A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • F23N5/10—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples
    • F23N5/102—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples using electronic means
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/22—Pilot burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2229/00—Flame sensors
    • F23N2229/16—Flame sensors using two or more of the same types of flame sensor
    • 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
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/10—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples

Definitions

  • the present invention relates to a valve unit for modulating the delivery pressure of a gas, according to the preamble to the main claim.
  • the invention is suitable, particularly but not exclusively, for modulating the delivery pressure of fuel gas in space-heating apparatus. More particularly, the invention may be used for modulating the delivery pressure in gas fires, for example, decorative fires which have burners and for which regulation of the flame, and consequently a modulation of the gas-delivery pressure between maximum and minimum pressure values permitted for correct operation, is also required.
  • the control that is, the cutting-off of the gas supply
  • the modulation of the delivery pressure between the minimum and maximum values may be performed by means of a servo-valve subservient to a diaphragm modulation unit.
  • the diaphragm of the modulation unit is acted on, on one side, by the gas-delivery pressure as detected in the delivery duct to the user and, on the other side, by a resilient load which is subjected to the action of the movable element of an electromagnet and is variable between a minimum value and a maximum value, in dependence on the current driving the electromagnet.
  • thermogenerator devices such as thermocouples and thermopiles which can supply safety electromagnetic devices, purely for the function of shutting off the gas supply.
  • thermogenerating devices can generate relatively low electrical voltages or powers and although, on the one hand, these effectively ensure control of the gas shut-off function, on the other hand, they are insufficient to drive the electromagnetic actuators provided for the delivey-pressure modulation function.
  • Pressure modulation in fact requires powers of a few tens of volts greater than the powers which can be generated by the thermopile safety devices normally used in these valve units.
  • a first embodiment of the valve unit according to the present invention for modulating the delivery pressure of a fuel gas delivered to a burner or to another similar user, not shown in the drawing, is generally indicated 1.
  • the gas is supplied to the unit 1 through a supply duct 2 and is delivered thereby through a delivery duct 3.
  • the ducts 2 and 3 are separated by a servo-valve 4 comprising a closure member 5 which is urged resiliently into closure on a seat 6 by the resilient load of a spring 7 and which can be opened by a diaphragm 8 sensitive to the pressure differential existing between the pressure Pu in the delivery duct 3, on one side, and by the pressure Pt in a control chamber 9, on the other side.
  • the value of the control pressure Pt is controlled by the operation of a modulation valve, indicated 10 and described in detail below.
  • the valve unit 1 also comprises a safety valve 11 operated by an electromagnetic unit 12 supplied by a thermogenerator device, for example, including a thermocouple 12a heated by the flame of a pilot burner 13, shown schematically in the drawings.
  • the electromagnetic unit 12 is set manually by means of a setting member 14 provided with an operating rod 15 so as to open the safety valve 11 and to allow the gas to flow towards the delivery duct 3.
  • the valve unit 1 also has a second safety valve 16 the closure member 17 of which is urged by spring 18 into closure on a valve seat 19.
  • the seat 19 puts the supply duct 2 selectively into communication with a duct 20 for tapping off the gas delivered to the input of the valve unit.
  • the safety valve 16 has operating means 21 mechanically coupled to the manual setting member 14 of the safety valve 11. The mechanical coupling is such that, during setting, the safety valve 16 is kept closed and is acted on so as to be opened by the operating means 21, thus allowing the gas to flow through the tapping-off duct 20, only upon the release of the setting member 14 after the pilot flame has been lit.
  • the duct 20 is in communication with a chamber 22 through a valve seat 23 onto which a closure member 24, movable by the action of a control rod 25 of the modulation valve 10, is urged into closure.
  • the chamber 22 is always in communication with the control chamber 9 through a transfer duct 26, and with the delivery duct 3 through a duct 27.
  • the duct 27 is in communication with the chamber 22 through a calibrated hole 28.
  • a valve for regulating the maximum delivery pressure is indicated 30.
  • the valve 30 has a diaphragm 31 fixed to a plate holding a closure member 32 associated with a corresponding valve seat 33.
  • the diaphragm 31 is subjected, on one side, to the load which is exerted by a spring 34 and which can be adjusted by screwing of a spring-holder 35 and, on the other side, to the pressure existing in a chamber 36.
  • the chamber 36 is in communication with the chamber 22 through the valve seat 33 and with the delivery duct 3 through a transfer duct 37.
  • the modulation valve 10 comprises an actuator 38 with an electromagnet the solenoid of which is supplied with an operative signal S controlled by a driver circuit 39 shown only schematically in the drawings.
  • the actuator of the modulation valve 10 may be of a piezoelectric type, for example, with a double blade.
  • Means are provided in the driver circuit 39 for generating the signal S with a curve (as a function of time) of the type shown in Figure 5.
  • the signal S is of constant frequency with a preselected period T and its amplitude is variable within the period T. More particularly, the pulsed signal S is generated as a continuous signal within a first interval T1 and as a signal with zero amplitude in a second interval T2 sequential with the first and such that the overall duration of the intervals T1 and T2 is equal to the period T.
  • the signal S is preferably an electrical voltage signal with which the solenoid of the modulation valve 10 is supplied.
  • Figure 4 shows the pressure-time graph of the control pressure Pt in the condition in which the modulation valve 10 is supplied with the driving signal S of Figure 5. It will be noted that the pressure Pt tends to increase during the intervals T1 and to decrease during the intervals T2, varying in accordance with the curves 40 and 41 shown in Figure 3, respectively.
  • the pressure-time function can be broken down into the sum of a first portion and a second portion, that is, a continuous portion and an oscillating portion, respectively, of which the first, continuos portion, shown in Figure 6, is constituted by the integrated mean value of the pressure function Pt of Figure 4.
  • the control pressure Pt actually detectable in the control chamber 9 is constituted solely by the continuous portion of the function, in addition to the oscillating portion which, however, since it has a mean value of zero within the period, does not affect the integrated mean value of the pressure Pt.
  • Figure 7 shows a curve similar to that of Figure 4 in which a ratio, indicated D, between the interval T1 and the period T, greater than the ratio adopted for the curve of Figure 4 has been selected.
  • the curve of Figure 7 represents an integrated mean value of the pressure Pt which is shown in Figure 9 and which is greater than that of Figure 6.
  • Modulation of the ratio D by adjusting the duration of the interval T1 relative to the selected period T achieves, in a proportionally correlated manner, continuous modulation of the integrated mean value of the control pressure Pt, and consequently of the gas-delivery pressure in the duct 3, with consequent modulation of the flow-rate of the gas.
  • the pressure Pt is modulated within a range of values between a maximum pressure value established by the valve 30 and a minimum pressure value set by the minimum value adopted by the ratio D.
  • the modulation valve 10 is also arranged to perform the function of shutting off the flow of gas delivered to the input of the valve unit 1.
  • the driving signal S controlled by the circuit 39 is preferably selected as a low-voltage signal, for example, with an order of magnitude of hundreds of millivolts.
  • the modulation valve can also advantageously be supplied by the energy produced by the thermoelectric phenomenon in a thermopile 12b of the thermogenerator device.
  • FIG. 2 shows a second embodiment of the valve unit according to the invention, generally indicated 50, in which details similar to those of the previous embodiment are indicated by the same reference numerals.
  • the unit 50 differs from that of the previous embodiment mainly in that, for modulating the control pressure Pt, it has a valve 51 the modulation function of which is similar to that of the valve 10 of the previous embodiment, to which reference should be made for a detailed description.
  • the valve unit 50 has a further ON-OFF valve 52 which, unlike the valve 51, is not supplied with the driving signal of modulated duration.
  • the modulation valve 51 comprises a closure body which is urged into closure on a valve seat 53 through which the chamber 22 is in communication with a duct 54.
  • the duct 54 opens into the duct 27 through a hole 55 acted on by a pin closure member 56, adjustable by screwing of a closure-member holder 57.
  • the minimum pressure tolerated for correct operation of the valve unit is regulated by the pin closure member 56.
  • control pressure Pt in the chamber 22 is generated as described fully above and in a similar manner for the valve units of both embodiments described.
  • This control pressure Pt is transferred by the transfer duct 26 to the control chamber 9. If, for example, the pressure in the control chamber is increased as a result of an increase in the pressure Pt, this pressure acts on the diaphragm 8, urging the closure member 5 to open.
  • the partial opening of the closure member 5 brings about a corresponding increase in the delivery pressure and consequently in the flow-rate of gas delivered, as a result of a reduction in the pressure losses.
  • the invention thus solves the problem set, achieving many advantages in comparison with known solutions.
  • a first advantage is that, with the valve unit of the present invention, a modulation of the gas delivery pressure and flow-rate is achieved by means of a driver circuit supplied with thermoelectric energy within the system and does not therefore require any external supply.
  • This advantageously eliminates both the use of the mains electrical supply which, in the event of interruption, would not ensure safe operation of the valve unit, and the use of battery voltage generators for supplying the pressure-modulation device.
  • it is also possible to achieve advantageously low consumption because of the low power required for the control of the modulation valve.
  • valve unit of the invention ensures the pressure-modulation function by the operation of a single modulation valve, with consequent structural simplicity and low costs.
EP99120258A 1999-06-02 1999-10-11 Arrangement de soupapes pour réguler la pression d'alimentation d'un gaz Withdrawn EP1058060A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1999PD000121A IT1308113B1 (it) 1999-06-02 1999-06-02 Gruppo valvolare per la modulazione della pressione di erogazione diun gas.
ITPD990121 1999-06-02

Publications (1)

Publication Number Publication Date
EP1058060A1 true EP1058060A1 (fr) 2000-12-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP99120258A Withdrawn EP1058060A1 (fr) 1999-06-02 1999-10-11 Arrangement de soupapes pour réguler la pression d'alimentation d'un gaz

Country Status (2)

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EP (1) EP1058060A1 (fr)
IT (1) IT1308113B1 (fr)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001090648A1 (fr) * 2000-05-25 2001-11-29 Honeywell B.V. Dispositif de regulation destine a des bruleurs a gaz
WO2003064928A1 (fr) 2002-01-29 2003-08-07 Sit La Precisa S.P.A. Ensemble soupape pour moduler la pression de refoulement d'un gaz
DE10232653B3 (de) * 2002-07-18 2004-03-11 Honeywell B.V. Regeleinrichtung für Gasbrenner
US6938634B2 (en) 2003-05-30 2005-09-06 Robertshaw Controls Company Fuel control mechanism and associated method of use
US6941962B2 (en) 2003-05-30 2005-09-13 Robertshaw Controls Company Convertible control device capable of regulating fluid pressure for multiple fluid types and associated method of use
US6978798B2 (en) 2002-07-18 2005-12-27 Honeywell International, Inc. Gas flow control
US7066203B2 (en) 2002-07-18 2006-06-27 Honeywell International, Inc. Gas flow control
US7255100B2 (en) 1999-10-18 2007-08-14 Compuvalve Llc Electronic gas cooktop control with simmer system and method thereof
WO2007122092A2 (fr) * 2006-04-24 2007-11-01 Siemens Aktiengesellschaft Régulateur de pression pour des substances gazeuses
US7950622B2 (en) 2007-07-25 2011-05-31 Honeywell International, Inc. System, apparatus and method for controlling valves
ITPD20100089A1 (it) * 2010-03-22 2011-09-23 Sit La Precisa S P A Con Socio Uni Co Dispositivo per il controllo dell' erogazione di un gas combustibile verso un apparecchio bruciatore
ITPD20110261A1 (it) * 2011-08-03 2013-02-04 Sit La Precisa Spa Con Socio Unico Metodo e sistema di controllo di una unità valvolare modulante includente un elettromagnete
IT201800010571A1 (it) * 2018-11-26 2020-05-26 Sit Spa Dispositivo per il controllo dell’erogazione di un gas combustibile verso un bruciatore di un apparecchio riscaldatore
WO2020181302A1 (fr) * 2019-03-13 2020-09-17 Innio Jenbacher Gmbh & Co Og Moteur à combustion interne
WO2022185294A1 (fr) * 2021-03-02 2022-09-09 Industrial Atilla Ltda Dispositif de contrôle rapide de flammes à réponse variable en continu

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0379759A1 (fr) * 1989-01-26 1990-08-01 Ranco Japan Limited Vanne à commande proportionnelle
US5180138A (en) * 1991-02-08 1993-01-19 Firma A.U.K. Muller Gmbh & Co. Kg Solenoid controlled servo valve
US5341839A (en) * 1992-06-15 1994-08-30 Toto Ltd. Water flow control system
EP0635680A1 (fr) * 1993-07-20 1995-01-25 SIT LA PRECISA S.r.l. Un actionneur pour un brûleur à gaz avec un sécurité à flamme et un soupape de commande électromagnétique
DE4420333A1 (de) * 1994-06-10 1995-12-14 Grohe Armaturen Friedrich Ansteuerung eines batteriebetriebenen, bistabilen Servo-Magnetventils
US5518396A (en) * 1994-06-14 1996-05-21 Zeltron S.P.A. Self-powered flame monitoring apparatus
EP0800039A1 (fr) * 1996-04-02 1997-10-08 SIT LA PRECISA S.r.l. Une unité de soupape pour commander la pression d'alimentation d'un gaz

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0379759A1 (fr) * 1989-01-26 1990-08-01 Ranco Japan Limited Vanne à commande proportionnelle
US5180138A (en) * 1991-02-08 1993-01-19 Firma A.U.K. Muller Gmbh & Co. Kg Solenoid controlled servo valve
US5341839A (en) * 1992-06-15 1994-08-30 Toto Ltd. Water flow control system
EP0635680A1 (fr) * 1993-07-20 1995-01-25 SIT LA PRECISA S.r.l. Un actionneur pour un brûleur à gaz avec un sécurité à flamme et un soupape de commande électromagnétique
DE4420333A1 (de) * 1994-06-10 1995-12-14 Grohe Armaturen Friedrich Ansteuerung eines batteriebetriebenen, bistabilen Servo-Magnetventils
US5518396A (en) * 1994-06-14 1996-05-21 Zeltron S.P.A. Self-powered flame monitoring apparatus
EP0800039A1 (fr) * 1996-04-02 1997-10-08 SIT LA PRECISA S.r.l. Une unité de soupape pour commander la pression d'alimentation d'un gaz

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1222429B1 (fr) * 1999-10-18 2008-09-03 Pierre Repper Commande electronique de surface de cuisson au gaz comportant un systeme de mijotage
US7255100B2 (en) 1999-10-18 2007-08-14 Compuvalve Llc Electronic gas cooktop control with simmer system and method thereof
WO2001090648A1 (fr) * 2000-05-25 2001-11-29 Honeywell B.V. Dispositif de regulation destine a des bruleurs a gaz
WO2003064928A1 (fr) 2002-01-29 2003-08-07 Sit La Precisa S.P.A. Ensemble soupape pour moduler la pression de refoulement d'un gaz
CZ305381B6 (cs) * 2002-01-29 2015-08-26 Sit S.P.A. Ventilová jednotka pro modulaci výtlačného tlaku plynu
US6978798B2 (en) 2002-07-18 2005-12-27 Honeywell International, Inc. Gas flow control
US7066203B2 (en) 2002-07-18 2006-06-27 Honeywell International, Inc. Gas flow control
DE10232653B3 (de) * 2002-07-18 2004-03-11 Honeywell B.V. Regeleinrichtung für Gasbrenner
US6945507B2 (en) 2002-07-18 2005-09-20 Honeywell International, Inc. Gas flow control
US6938634B2 (en) 2003-05-30 2005-09-06 Robertshaw Controls Company Fuel control mechanism and associated method of use
US6941962B2 (en) 2003-05-30 2005-09-13 Robertshaw Controls Company Convertible control device capable of regulating fluid pressure for multiple fluid types and associated method of use
WO2007122092A3 (fr) * 2006-04-24 2007-12-13 Siemens Ag Régulateur de pression pour des substances gazeuses
US8096522B2 (en) 2006-04-24 2012-01-17 Siemens Aktiengesellschaft Pressure regulator for gaseous media
WO2007122092A2 (fr) * 2006-04-24 2007-11-01 Siemens Aktiengesellschaft Régulateur de pression pour des substances gazeuses
US7950622B2 (en) 2007-07-25 2011-05-31 Honeywell International, Inc. System, apparatus and method for controlling valves
ITPD20100089A1 (it) * 2010-03-22 2011-09-23 Sit La Precisa S P A Con Socio Uni Co Dispositivo per il controllo dell' erogazione di un gas combustibile verso un apparecchio bruciatore
US8479759B2 (en) 2010-03-22 2013-07-09 Sit La Precisa S.P.A. Con Socio Unico Device for controlling the supply of a combustible gas to a burner apparatus
ITPD20110261A1 (it) * 2011-08-03 2013-02-04 Sit La Precisa Spa Con Socio Unico Metodo e sistema di controllo di una unità valvolare modulante includente un elettromagnete
WO2013017346A1 (fr) * 2011-08-03 2013-02-07 Sit La Precisa S.P.A. Con Socio Unico Procédé et système pour commander une unité de soupape de modulation comprenant un électroaimant
IT201800010571A1 (it) * 2018-11-26 2020-05-26 Sit Spa Dispositivo per il controllo dell’erogazione di un gas combustibile verso un bruciatore di un apparecchio riscaldatore
WO2020109196A1 (fr) * 2018-11-26 2020-06-04 Sit S.P.A. Dispositif de régulation d'alimentation en gaz combustible de brûleur d'appareil de chauffage
WO2020181302A1 (fr) * 2019-03-13 2020-09-17 Innio Jenbacher Gmbh & Co Og Moteur à combustion interne
US11572847B2 (en) 2019-03-13 2023-02-07 Innio Jenbacher Gmbh & Co Og Internal combustion engine
WO2022185294A1 (fr) * 2021-03-02 2022-09-09 Industrial Atilla Ltda Dispositif de contrôle rapide de flammes à réponse variable en continu

Also Published As

Publication number Publication date
ITPD990121A1 (it) 2000-12-02
IT1308113B1 (it) 2001-11-29

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