WO2006003684A1 - Soupape multifonction servant a reguler l'alimentation d'un bruleur en gaz combustible - Google Patents

Soupape multifonction servant a reguler l'alimentation d'un bruleur en gaz combustible Download PDF

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Publication number
WO2006003684A1
WO2006003684A1 PCT/IT2005/000340 IT2005000340W WO2006003684A1 WO 2006003684 A1 WO2006003684 A1 WO 2006003684A1 IT 2005000340 W IT2005000340 W IT 2005000340W WO 2006003684 A1 WO2006003684 A1 WO 2006003684A1
Authority
WO
WIPO (PCT)
Prior art keywords
obturator
diaphragm
pressure
valve unit
feed
Prior art date
Application number
PCT/IT2005/000340
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English (en)
Other versions
WO2006003684A8 (fr
Inventor
Gianpiero Turrin
Stefano Zanella
Original Assignee
Sit La Precisa S.P.A.
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 S.P.A. filed Critical Sit La Precisa S.P.A.
Publication of WO2006003684A1 publication Critical patent/WO2006003684A1/fr
Publication of WO2006003684A8 publication Critical patent/WO2006003684A8/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/002—Regulating fuel supply using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2900/00—Special features of, or arrangements for fuel supplies
    • F23K2900/05001—Control or safety devices in gaseous or liquid fuel supply lines
    • 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
    • F23N2235/18—Groups of two or more 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

Definitions

  • the present invention relates to a multi-function valve unit for controlling the feed of a combustible gas to a burner apparatus, as claimed in the precharacterizing clause of the principal claim n.l. Technical background
  • the invention relates particularly to the field of systems for controlling the feed of gas to burners of heating apparatus in general, where the ⁇ flames of such apparatus are intended for the direct heating of the environment or for heating an intermediate fluid circulating in a boiler installation.
  • Such equipment like all installations using gas burners, is normally provided with a valve unit designed to control the feed of gas to the burner, in such a way as to adjust in a controlled way its feed pressure and/or the flow rate of gas fed.
  • These valve units are typically designed for multifunctional control of the flow of gas fed to the burner, while also being required to carry out the function of shutting off the gas path for safety purposes and adjusting/modulating the feed pressure.
  • valve unit consists of a pressure regulating device, positioned in the main gas feed passage and typically including a valve having a diaphragm-controlled obturator.
  • the diaphragm is subjected, on one side, to the pressure regulated by the device, and, on the other side, to a pressure generated by an elastic load, which may be subject to calibration.
  • the diaphragm is subjected, on one side, to the supply 005/000340
  • the feed pressure is kept substantially constant and equal, subject to a proportionality factor, to the ratio between the elastic force and the surface area of the diaphragm subjected to the elastic force.
  • a limitation encountered in the aforesaid applications is related to the fact that the pressure, whether it be the supply pressure or the feed pressure, acting on the sides of the obturator and of the diaphragm which face each other generates corresponding forces whose resultant can affect, in a way which may be significant and in any case is undesired, the feed pressure regulation curve, by introducing a factor of deviation from the constant change of the feed pressure with the variation of the inlet pressure.
  • These pressure regulators can also be designed to provide amplitude- modulated pressure regulation.
  • the spring system (which generates the elastic load) of the regulator is acted on by an operating means (of the linear type for example), this term denoting any actuating means having an operating element with controlled movement acting on the spring system to vary the elastic force generated ,by the spring system.
  • operating devices can consist, for example, of electromagnets or controlled-shaft motors or other similar motorized means.
  • valve units of the aforesaid type also include one or more solenoid valves, comprising corresponding obturators whose operating rod is moved axially by means of an electromagnetic actuator, in opposition to an elastic spring system which can return the obturator to the shut-off position in the corresponding valve seat (for example in the absence of an electrical power supply to the electromagnet).
  • solenoid valves comprising corresponding obturators whose operating rod is moved axially by means of an electromagnetic actuator, in opposition to an elastic spring system which can return the obturator to the shut-off position in the corresponding valve seat (for example in the absence of an electrical power supply to the electromagnet).
  • a pair of these solenoid valves are provided (according to the specified technical standards) with exclusively on-off operation, in other words for the opening or safe closing of the corresponding valve seats located along the feed passage, but more complex versions can be produced with proportional or level-based operating devices, in other words devices which can assume a plurality of positions according to the value of the electrical supply signal sent to the solenoid valve.
  • a first and a second on-off solenoid valve are positioned in sequence along the feed passage, together with a pressure regulator of the modulating type operated by an operating device which is, for example, of the proportional (or level- based) type.
  • the pair of solenoid valves is responsible for the on-off operating function, while the pressure regulator is only responsible for the pressure modulation.
  • a limitation which may be encountered in these applications consists in the fact that three separate valve seats in sequence must be provided in all cases in the main feed passage of the valve unit, for each solenoid valve and for the pressure regulator downstream of these valves.
  • a further known configuration has only one pair of solenoid valves, positioned in sequence in the main feed passage, the first having an on-off function and the second having an on-off and modulating function.
  • the latter solenoid valve can typically be associated with an electromagnetic obturator of the proportional type.
  • the principal object and purpose of the invention is that of providing a valve unit whose structural and functional design is such that the limitations of the aforementioned prior art can be overcome.
  • FIG. 1 is a schematic view, in longitudinal section, of a first example of a valve unit according to the invention
  • FIG. 2 is a view, corresponding to Figure 1, of a second example of a valve unit according to the invention
  • Figure 3 is a view in axial section of a valve system which may be provided in the valve units of the preceding figures;
  • Figure 4 is a sectional view, on an enlarged scale, of a detail of the valve units of Figures 1 and 2.
  • the number 1 indicates the whole of a multifunctional valve unit for controlling the feed of a combustible gas (referred to below simply as "gas”), made according to the present invention.
  • the valve unit 1 comprises a feed passage 2 for transferring the gas from a feed element to a burner apparatus (neither of which are shown), this passage extending from a gas inlet aperture 3 to an aperture 4 for the outlet of the gas towards the burner.
  • the passage has a narrowed cross section, for example in the form of a nozzle 4a.
  • a solenoid valve 5 for allowing or safely shutting off the flow of gas in the passage 1 by an on-off operation of its valve against the corresponding valve seat.
  • It is, for example, of the normally closed type, and comprises a conventional electromagnetic actuator with an elastic return device designed so as to move the obturator to close the valve seat in the absence of a power supply to the electromagnet.
  • the valve unit 1 Downstream of the solenoid valve 5, the valve unit 1 comprises a pressure regulating device, indicated as a whole by 6, including a valve seat 7, formed in the passage 2, interacting with an obturator 8, whose operating rod 9 is connected rigidly to a diaphragm 10 for operating the device.
  • the diaphragm 10 is subjected on one side, indicated by 10a, to the supply pressure in the passage 2, indicated by Pi, and, on the other, opposing, side, indicated by 10b, to atmospheric pressure, owing to the provision of an orifice 13 formed in a wall 12.
  • the said wall 12, together with the diaphragm 10, forms a chamber 12a communicating with the outside through the orifice 13.
  • the number 14 indicates a spring system acting between the obturator 8 and a stationary part of the passage 2, which forms a means for elastically returning the obturator to the condition in which the corresponding valve seat 7 is shut off.
  • the obturator 8 is made with a dish configuration, having opposite sides or faces 8a and 8b.
  • the sides 8a and 10a of the obturator and of the diaphragm respectively, which face each other have substantially equivalent surface extensions which are in any case such that the pressure forces generated on the said sides by the inlet pressure in the passage 2 are directly opposing but of equal value, and therefore the resultant is substantially zero or in any case close to zero, so that this resultant has no effect on the balance of the overall forces acting on the pressure regulator.
  • the pressure regulating device 6 additionally comprises an operating means, indicated as a whole by 15, directly associated with the obturator 8 to move the latter in a controlled way with respect to the valve seat 7, as will be made clear in the rest of the description.
  • the operating means 15 comprises a barlike member 15a which can be translated coaxially with the rod 9 of the obturator 8 in a direction indicated by X in the figures. More particularly, the member 15a and the rod 9 are rigidly interconnected, to form extensions of each other, in the direction X, so that the operating means effectively acts on the obturator. An elastic element acting as an additional damper can also be interposed between the obturator 8 and the operating device 15.
  • the operating means 15 is of the proportional or level-based type, so that the operating member 15a (and consequently the obturator 8) can impart a force to the obturator correlated proportionally with the feed pressure desired from time to time.
  • the operating device 15 can conveniently be of what is known as the moving coil type, as described in detail below.
  • This operating device which may be housed in the chamber 12a, comprises a permanent magnet 20 in which an annular air gap 21 is formed.
  • a circular coil 22, through which a predetermined current flows, is axially movable in the air gap 21.
  • a force is generated on the coil which can move it axially in the direction X.
  • This force is also substantially constant along the predetermined path and is known to be correlated proportionally with the strength of the current flowing through the coil.
  • the coil 22 can be conveniently fixed to one end of the barlike member 15a.
  • the elastic load of the spring system 14 tends to make the obturator 8 close the valve seat 7.
  • the obturator 8 is subjected to the resultant of the elastic forces (spring system 14) and the magnetic induction forces (coil 22) and the opening of the valve seat 7 can thus be regulated, consequently regulating the gas feed pressure. It should be noted, therefore, that the feed pressure can be electrically controlled with on-off or modulating operating characteristics.
  • this moving coil operating device also has very low friction and consequently provides more precise control of the system. It is also possible to introduce alternating and direct components, superimposed on each other and having predetermined amplitudes, into the current signal, to additionally reduce any friction and hysteresis phenomena to provide greater precision of operation overall.
  • the electrical control of the pressure regulator can also make it possible to detect any instabilities (for example by detecting the impedance of the coil, or by using suitable sensor means), and to correct them electronically (for example by introducing suitable damping signals).
  • the operating means 15 can conveniently be made in the form of an electric motor acting on a loading spring system.
  • the motor is of the reversible stepping type, with means (such as male and female thread connections or the like) for converting the rotation of the rotor into a translational movement of the member 15a, in which the positions reached by the latter in the direction X are correlated with the number of rotations imparted to the motor.
  • the member 15a can be made in the form of a moving element of a proportional electromagnet, in which the spatial positions of this element along the axis X are correlated proportionally with the intensity of the electrical signal (with the current strength, for example) sent to the operating electromagnet.
  • the member 0340 In all the possible embodiments of the operating means 15, the member 0340
  • FIG. 15a is made to be returned to a predetermined safety position whenever there is no operating signal present in the operating means.
  • This safety device can be made with electromagnetic release means or with elastic return means, according to the chosen form of actuation. In all cases, the safety device is such that the member 15a is returned to a predetermined position independently of the operating condition of the operating means, whenever the operating signal to the latter is interrupted or is, for example, below a predetermined set threshold value.
  • Figure 2 shows schematically a second example of embodiment of the valve unit according to the invention, indicated as a whole by Ia, in which details similar to those of the preceding example are identified by the same reference numerals.
  • the valve unit Ia differs from the preceding example primarily in that it has, within the regulating device 6, a second diaphragm 25, which is positioned in the passage 2, downstream of the obturator 8 with respect to the direction of the gas flow.
  • the said diaphragm 25 is subjected, on one side (the side facing the obturator), to the gas feed pressure, indicated by Pu, and, on the other side, to atmospheric pressure, by the provision of an orifice 26 formed in a wall 27 of the valve unit.
  • the said wall 27, together with the diaphragm 25, forms a chamber 27a communicating with the outside through the orifice 26.
  • the spring system 14 acts between the diaphragm 10 and a stationary part of the valve unit.
  • the spring system 14 can be housed in the chamber 12, and, owing to its direct action on the obturator 8, forms a means of returning the obturator to the condition in which it shuts off the valve seat 7.
  • the operating member of the operating device 15 is made in the form of a barlike rod 28 which is fixed rigidly to the diaphragm 10, to the obturator 8 and to the diaphragm 25, and is connected at one end to the coil 22 of the operating means.
  • An elastic element acting as an additional damper can also be interposed between the operating device and the rod.
  • the said operating device 15 can also be conveniently housed in the chamber 27a. It should be noted that, in this example also, the sides 10a and 8a of the diaphragm and the obturator respectively have substantially equivalent surface extensions, so that the resultant of the forces generated on the said sides by the supply pressure Pi present at the inlet of the passage 2 is cancelled or made ineffective.
  • the side of the diaphragm 25 facing the obturator, identified by 25a, is preferably made in a size such that its surface extension is approximately double the surface extension of the facing side 8b of the obturator.
  • the feed pressure is substantially equal to the ratio between the resultant of the forces (caused by the elastic load and by the operating device) and the surface area of the obturator.
  • the elastic load of the spring system 14 prevails, so that the obturator 8 is pushed to close the valve seat 7.
  • the diaphragm 10 is moved and thus compresses the spring system 14 and increases the corresponding elastic load exerted.
  • the valve seat is IT2005/000340
  • valve unit can also be provided with means for calibrating the spring system 14, comprising for example bearing dishes for the corresponding spring system which can be moved by means of adjusting screws, and which have a conventional structure.
  • the solenoid 5 can be made, alternatively, in the form of a sealing and regulating valve with a double obturator.
  • a valve of this type is described in International Application PCT/IT03/00197 in the name of the present applicant, the description of which is considered to be incorporated herein in respect of any detail not more closely specified in the present context.
  • Figure 3 shows a preferred configuration of the solenoid valve 5, which can be positioned in the passage 2 upstream or downstream of the pressure regulator 6. More particularly, the valve comprises a first and a second valve seat 30, 31, coaxial with each other (on the axis X'), and positioned in sequence with each other, being associated respectively with one and the other (30a, 31a) of the pair of obturators provided.
  • An auxiliary minimum bypass passage 32 runs between the corresponding valve seats, and communicates with the main gas flow passage. The cross section of the bypass passage can be adjusted by means of an adjusting screw 33.
  • the values of the regulated minimum and maximum pressure are set by the calibration carried out in the valve 5, without any effect on these values due to the valve unit 1 (or Ia), while the said unit controls the feed pressure regulation curve between the aforesaid minimum and maximum values.
  • the solenoid valves and the regulating device can be positioned or combined along the passage in a different order and sequence from that described specifically in the examples which have been mentioned.
  • an auxiliary passage can be branched from the passage 2 between the solenoid valve 5 and the valve unit 1 to feed a pilot burner. This pilot passage can also be of the type with a regulated flow rate.
  • the invention resolves the initial problem and provides the previously claimed advantages over the known solutions. It should also be noted that, since the minimum pressure level can be preset in a deterministic way with the valve unit according to the invention, a high ratio between the maximum and minimum feed flow rates is advantageously achieved by using the valve unit according to the invention. Another advantage which should be mentioned is the constructional simplicity of the valve unit according to the invention by comparison with known solutions.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Magnetically Actuated Valves (AREA)
  • Feeding And Controlling Fuel (AREA)

Abstract

L'invention concerne une soupape multifonction servant à réguler l'alimentation d'un brûleur en gaz combustible. La soupape multifonction comprend: une conduite (2) d'alimentation du gaz qui s'étend d'une ouverture d'entrée (3) à une ouverture de sortie (4) de la soupape; une vanne électromagnétique (5) placée sur la conduite (2) et munie d'une fonction marche/arrêt; et un régulateur de pression (6) comprenant un siège de soupape (7) logé dans la conduite et associé à un obturateur (8) commandé par au moins un diaphragme (10) associé à l'obturateur (8) pour assurer un fonctionnement tel que les côtés affrontés (8a, 10a) de l'obturateur (8) et du (des) diaphragme(s) (10) soient soumis, respectivement, au même niveau de pression, l'autre côté du (des) diaphragme(s) (10) étant soumis à une charge préétablie. La soupape comprend également, en association avec l'obturateur (8) du régulateur de pression (6): un moyen de renvoi (14) qui ramène l'obturateur (8) à une position dans laquelle le siège de soupape (7) correspondant est fermé; et un moyen de commande (15) qui déplace l'obturateur (8) relativement au siège de soupape (7), en opposition au moyen de renvoi (14), pour réguler la pression d'alimentation par modulation, si bien que la fonction marche/arrêt et la fonction de modulation sont toutes deux intégrées dans le régulateur de pression (6). Les côtés (8a, 10a) de l'obturateur (8) et du diaphragme (10), respectivement, présentent aussi des extensions de surface sensiblement équivalentes, de sorte que les contraintes résultantes générées dans le régulateur de pression (6) par les pressions agissant sur les côtés affrontés de l'obturateur et du diaphragme soient généralement rendues inopérantes, voire réduites à néant.
PCT/IT2005/000340 2004-07-02 2005-06-15 Soupape multifonction servant a reguler l'alimentation d'un bruleur en gaz combustible WO2006003684A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000176A ITPD20040176A1 (it) 2004-07-02 2004-07-02 Unita' valvolare multifunzionale per il controllo dell'erogazione di un gas combustibile verso un apparecchio bruciatore
ITPD2004A000176 2004-07-02

Publications (2)

Publication Number Publication Date
WO2006003684A1 true WO2006003684A1 (fr) 2006-01-12
WO2006003684A8 WO2006003684A8 (fr) 2006-03-09

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PCT/IT2005/000340 WO2006003684A1 (fr) 2004-07-02 2005-06-15 Soupape multifonction servant a reguler l'alimentation d'un bruleur en gaz combustible

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IT (1) ITPD20040176A1 (fr)
WO (1) WO2006003684A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009054009A2 (fr) * 2007-10-22 2009-04-30 Bertelli & Partners S.R.L. Dispositif de soupape de sécurité multifonctionnel à régulateur de pression proportionnelle intégré
EP2159487A2 (fr) * 2008-08-27 2010-03-03 Robert Bosch GmbH Gas Boiler
EP3043114A1 (fr) 2015-01-08 2016-07-13 Robert Bosch Gmbh Soupape de regulation
EP2802781B1 (fr) 2012-03-27 2016-11-16 EBM-PAPST Landshut GmbH Régulateur de pression de gaz modulaire et soupape de régulation de gaz

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3685730A (en) * 1970-09-28 1972-08-22 Robertshaw Controls Co Thermostatic flow control device
US3796368A (en) * 1972-09-18 1974-03-12 Robertshaw Controls Co Diaphragm operated flow control device
US3872877A (en) * 1972-10-18 1975-03-25 Robertshaw Controls Co Fuel control system and pressure regulator construction therefor and method for operating the same
WO2000079164A1 (fr) * 1999-06-21 2000-12-28 Email Limited Configuration de regulateur
EP1329668A2 (fr) * 2002-01-18 2003-07-23 FAGOR, S.Coop Soupape à gaz avec un thermostat et un régulateur à pression
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
EP1382907A1 (fr) * 2002-07-12 2004-01-21 G. Kromschröder Aktiengesellschaft Dispositif pour régler le débit de gaz dans un brûleur

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3685730A (en) * 1970-09-28 1972-08-22 Robertshaw Controls Co Thermostatic flow control device
US3796368A (en) * 1972-09-18 1974-03-12 Robertshaw Controls Co Diaphragm operated flow control device
US3872877A (en) * 1972-10-18 1975-03-25 Robertshaw Controls Co Fuel control system and pressure regulator construction therefor and method for operating the same
WO2000079164A1 (fr) * 1999-06-21 2000-12-28 Email Limited Configuration de regulateur
EP1329668A2 (fr) * 2002-01-18 2003-07-23 FAGOR, S.Coop Soupape à gaz avec un thermostat et un régulateur à pression
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
EP1382907A1 (fr) * 2002-07-12 2004-01-21 G. Kromschröder Aktiengesellschaft Dispositif pour régler le débit de gaz dans un brûleur

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009054009A2 (fr) * 2007-10-22 2009-04-30 Bertelli & Partners S.R.L. Dispositif de soupape de sécurité multifonctionnel à régulateur de pression proportionnelle intégré
WO2009054009A3 (fr) * 2007-10-22 2009-08-20 Bertelli & Partners Srl Dispositif de soupape de sécurité multifonctionnel à régulateur de pression proportionnelle intégré
EP2317224A2 (fr) 2007-10-22 2011-05-04 Bertelli & Partners S.R.L. Dispositif de soupape de sécurité multifonctions ayant un régulateur de pression proportionnel intégré
US8550112B2 (en) 2007-10-22 2013-10-08 Bertelli & Partners S.R.L. Multifunctional safety valve device with incorporated proportional pressure regulator
EP2159487A2 (fr) * 2008-08-27 2010-03-03 Robert Bosch GmbH Gas Boiler
FR2935463A1 (fr) * 2008-08-27 2010-03-05 Bosch Gmbh Robert Chaudiere a gaz.
EP2159487A3 (fr) * 2008-08-27 2014-03-05 Robert Bosch GmbH Gas Boiler
EP2802781B1 (fr) 2012-03-27 2016-11-16 EBM-PAPST Landshut GmbH Régulateur de pression de gaz modulaire et soupape de régulation de gaz
EP2802781B2 (fr) † 2012-03-27 2023-08-09 EBM-PAPST Landshut GmbH Régulateur de pression de gaz modulaire et soupape de régulation de gaz
EP3043114A1 (fr) 2015-01-08 2016-07-13 Robert Bosch Gmbh Soupape de regulation

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Publication number Publication date
WO2006003684A8 (fr) 2006-03-09
ITPD20040176A1 (it) 2004-10-02

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