WO2001025693A1 - UNITE A VALVE DE REGULATION DU DEBIT DE GAZ COMBUSTIBLE EN FONCTION DU DEBIT D'EAU, SPECIALEMENT CONçUE POUR LES CHAUFFAGES A EAU - Google Patents

UNITE A VALVE DE REGULATION DU DEBIT DE GAZ COMBUSTIBLE EN FONCTION DU DEBIT D'EAU, SPECIALEMENT CONçUE POUR LES CHAUFFAGES A EAU Download PDF

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Publication number
WO2001025693A1
WO2001025693A1 PCT/EP2000/006529 EP0006529W WO0125693A1 WO 2001025693 A1 WO2001025693 A1 WO 2001025693A1 EP 0006529 W EP0006529 W EP 0006529W WO 0125693 A1 WO0125693 A1 WO 0125693A1
Authority
WO
WIPO (PCT)
Prior art keywords
rate
flow
valve unit
valve
unit according
Prior art date
Application number
PCT/EP2000/006529
Other languages
English (en)
Inventor
Maurizio Grando
Michele Bortoliero
Vanni Gallocchio
Original Assignee
Op Controls 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 Op Controls S.P.A. filed Critical Op Controls S.P.A.
Priority to AT00954460T priority Critical patent/ATE251738T1/de
Priority to DK00954460T priority patent/DK1218672T3/da
Priority to EP00954460A priority patent/EP1218672B1/fr
Priority to DE60005851T priority patent/DE60005851T2/de
Priority to AU66910/00A priority patent/AU6691000A/en
Publication of WO2001025693A1 publication Critical patent/WO2001025693A1/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
    • F23N1/08—Regulating fuel supply conjointly with another medium, e.g. boiler water
    • F23N1/085—Regulating fuel supply conjointly with another medium, e.g. boiler water 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
    • F23N1/005—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
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/16—Fuel valves variable flow or proportional valves

Definitions

  • the present invention relates to a valve unit for regulating the flow-rate of fuel gas in dependence on the flow-rate of water, particularly for water-heaters, according to the preamble to the main claim.
  • a valve unit including these characteristics is known from European patent No. 240394.
  • This valve unit in fact has a turbine which is driven by a fraction of the water flow supplied in order to operate an electric-current generator used for lighting a pilot flame.
  • the present invention is applicable, in particular but not exclusively, to the field of instantaneous domestic water-heaters in which a fuel gas is supplied to a burner in order to heat water for hygiene purposes .
  • a fuel gas is supplied to a burner in order to heat water for hygiene purposes .
  • the supply of the fuel gas is arranged to take place only in proportion to a supply of hot water.
  • Devices of the so-called "Venturi" type for controlling the flow-rate of the gas in dependence on the flow-rate of water are known for this purpose.
  • the actuator is constituted by a diaphragm which is subjected to the differential pressure and is connected mechanically by means of a system of rods to the closure element of the valve regulating the flow-rate of gas by means of a system of rods .
  • a further disadvantage is that these devices involve an insecure separation between the water and gas circuits, resulting in possible infiltrations and, in any case, complexity of the sealing systems. Disclosure of the invention
  • the problem upon which the present invention is based is that of providing a valve unit for regulating the flow-rate of fuel gas in dependence on the flow-rate of water, particularly for water-heaters, which is designed structurally and functionally to overcome the limitations described above with reference to the prior art mentioned.
  • FIG. 1 is a front view showing, in section, a valve unit formed in accordance with the present invention
  • FIG. 2 is a view of the valve unit, sectioned in the plane II-II of Figure 1. Best mode for carrying out the invention
  • valve unit for regulating the flow- rate of a fuel gas in dependence on a flow-rate of water formed in accordance with the present invention.
  • the valve unit 1 comprises a hydraulic turbine 2 the rotor 2a of which is housed in a chamber 3 and supported rotatably for rotating about an axis X.
  • Inlet and outlet openings indicated 4 and 5 respectively, are provided in the chamber 3 for the connection of the turbine 2 in a line through which the water to be supplied flows.
  • the openings 4 and 5 are arranged in a manner such that the rotor 2a of the turbine 2 is rotated about the axis X by the flow of water. It is intended that the turbine may be driven by the entire flow of water treated or by a known fraction thereof .
  • An eddy-current brake is associated with the turbine 2 and comprises an annular body 7 made of electrically conductive material, preferably aluminium or copper, extending coaxially from only one side 2b of the rotor 2a and a magnetic field generator such as a permanent magnet 9, coaxial with the annular body 7 and also supported rotatably in the valve unit 1 for rotating about the axis X.
  • the annular body 7 and the permanent magnet 9 are housed, respectively, in a first chamber 8 formed in the chamber 3 and in a second, hydraulically separate chamber 10 which thus communicates neither with the chamber 3 nor with the first chamber 8.
  • the first chamber 8 preferably extends coaxially around the second chamber 10 housing the permanent magnet 9, so that the wall separating the chambers is thin.
  • the valve unit 1 also comprises a regulation valve 11 inserted in a duct 12 through which the fuel gas flows, for modulating the flow-rate thereof.
  • the valve 11 includes a closure element 13 mounted on one end of a rod 14 which in turn is connected to the permanent magnet 9 by transmission actuator means 15.
  • the actuator means 15 are of the type with gears and comprise a pinion or sprocket 16 keyed to a shaft 16a extending axially from the magnet 9.
  • the pinion 16 is meshed with a rack 17 formed on the rod 14.
  • the rod 14 is disposed along an axis Y substantially perpendicular to the axis X of the pinion 16 and the rack 17 is constituted by teeth extending peripherally around the rod 14.
  • the closure element 13 is movable along the axis Y between a closure position, in which it is in abutment with a respective seat 19 to prevent the flow of gas along the duct 12, and an open position in which it is removed from the seat 19.
  • This movement is opposed by a spring 20 a first end of which is in abutment with a shoulder 13a formed on the closure element 13 so as to urge the closure element 13 against the seat 19.
  • the valve unit 1 performs its function of controlling the flow-rate of the fuel gas in dependence on the flow-rate of water in the terms indicated briefly below.
  • the eddy-current brake 6 transforms this rate of rotation into a corresponding torque which is transmitted to the rod 14 of the regulation valve 11 by the permanent magnet 9 and the actuator means 15.
  • This action of the eddy-current brake is regulated owing to the fact that, in a conductor which is subjected to a variation in magnetic induction flux, electrical currents are created which tend to oppose the variation in flux.
  • the rotary motion of the annular body 7 about the permanent magnet 9 creates, in the body 7, induced currents the electromagnetic field of which opposes this relative motion, tending to "drag" the magnet 9 along with it.
  • the closure element 13 is moved along the axis Y in opposition to the spring 20, away from the seat 19, allowing the gas to flow.
  • the position reached by the closure element 13 is defined by the equilibrium between the resilient force of the spring 20 tending to close the closure element 13 and the torque generated by the eddy-current brake.
  • the greater is the torque generated by the brake the greater is the degree of opening of the closure element 13 and hence the greater is the flow-rate of fuel gas.
  • valve unit 1 is intended to be fitted on an instantaneous water- heater with a pilot flame .
  • the valve unit is therefore also provided with a thermoelectric valve 21 for shutting off the fuel-gas duct 12, with actuator means 22 for manual opening of the thermoelectric valve, and with an auxiliary pilot- flame supply duct which is not shown in the drawings but which branches off the duct 12 in a position between the thermoelectric valve and the regulation valve .
  • the thermoelectric valve 21 is disposed upstream of the regulation valve 11 and preferably in a position substantially parallel thereto.
  • the functional characteristics of the thermoelectric valve 21 provide, in conventional manner, for a capability of its closure element 23 to be held in a position in which the fuel gas circuit is open by means of an internal electromagnetic circuit controlled by a pilot-flame presence indicator, for example, a thermocouple .
  • closure element 23 which would no longer be held by the electromagnetic circuit, would be moved to the closure position by resilient means 24 so as to shut off the duct 12 for supplying the fuel gas to the burner of the water-heater.
  • the actuator means 22 for manual opening of the thermoelectric valve 21 comprise a push-button 25 which is disposed outside the valve unit 1 and to which first and second parallel pressure elements, extending inside the valve unit and indicated 26 and 27, are fixed.
  • the first pressure element 26 is arranged as an extension of the closure element 23 of the thermoelectric valve, and the free end of the second pressure element 27 is in abutment with the end of the spring 20 remote from the closure element 13 of the regulation valve.
  • the pushbutton 25 is pressed against the valve unit, thus moving the closure element 23 partially into the electromagnetic circuit of the thermoelectric valve, by means of the first pressure element 26.
  • the fuel gas can flow to the auxiliary duct in order to supply the pilot flame without, however, being able to reach the burner through the regulation valve 11.
  • the closure element 13 is in fact closed against the seat 19 by the spring 20 which, during this operation to move the push-button 25 is further compressed by the second pressure element 27. Lighting of the pilot flame operates the electromagnetic circuit of the thermoelectric valve which holds the closure element 23 in the open position without the need for operation of the actuator means 22, which can be released.
  • These actuator means are returned to a position remote from the valve unit 1 by the action of the spring 20.
  • the present invention thus overcomes the limitations described above with reference to the prior art mentioned, at the same time offering many advantages.
  • a first advantage is constituted by the complete and total hydraulic separation between the water and gas circuits.
  • Another advantage consists of the true proportionality of the regulation of the gas in dependence on the flow-rate of water and, not least, it should be borne in mind that the regulation is ensured by inexpensive operating means which are reliable over time.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Temperature-Responsive Valves (AREA)
  • Flow Control (AREA)
  • Magnetically Actuated Valves (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Details Of Valves (AREA)

Abstract

L'invention concerne une unité à valve (1) de régulation du débit d'un gaz combustible en fonction du débit d'eau, spécialement conçue pour les chauffages à eau. Cette unité à valve comprend une valve de régulation (11) du débit du gaz combustible et une turbine hydraulique (2) qui comprend un rotor (2a). La vitesse de rotation du rotor (2a) est associée au débit d'eau. La turbine hydraulique (2) est reliée à la valve de régulation (11) de façon à réguler le débit du gaz combustible en fonction du débit d'eau arrivant à la turbine.
PCT/EP2000/006529 1999-10-01 2000-07-10 UNITE A VALVE DE REGULATION DU DEBIT DE GAZ COMBUSTIBLE EN FONCTION DU DEBIT D'EAU, SPECIALEMENT CONçUE POUR LES CHAUFFAGES A EAU WO2001025693A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AT00954460T ATE251738T1 (de) 1999-10-01 2000-07-10 Eine ventileinheit zur regelung der gasdurchflussmenge in abhängkeit der wasserdurchflussmenge, insbesondere für wassererhitzer
DK00954460T DK1218672T3 (da) 1999-10-01 2000-07-10 Ventilenhed til regulering af strømningshastigheden for brændstofgas afhængigt af strømningshastigheden for vand, især tilslutning vandvarmere
EP00954460A EP1218672B1 (fr) 1999-10-01 2000-07-10 UNITE A VALVE DE REGULATION DU DEBIT DE GAZ COMBUSTIBLE EN FONCTION DU DEBIT D'EAU, SPECIALEMENT CONçUE POUR LES CHAUFFAGES A EAU
DE60005851T DE60005851T2 (de) 1999-10-01 2000-07-10 Eine ventileinheit zur regelung der gasdurchflussmenge in abhängkeit der wasserdurchflussmenge, insbesondere für wassererhitzer
AU66910/00A AU6691000A (en) 1999-10-01 2000-07-10 A valve unit for regulating the flow-rate of fuel gas in dependence on the flow-rate of water, particularly for water heaters

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1999PD000215A IT1307394B1 (it) 1999-10-01 1999-10-01 Gruppo valvolare per la regolazione della portata di gas combustibilein funzione della portata d'acqua, in particolare per scaldaacqua.
ITPD99A000215 1999-10-01

Publications (1)

Publication Number Publication Date
WO2001025693A1 true WO2001025693A1 (fr) 2001-04-12

Family

ID=11392738

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/006529 WO2001025693A1 (fr) 1999-10-01 2000-07-10 UNITE A VALVE DE REGULATION DU DEBIT DE GAZ COMBUSTIBLE EN FONCTION DU DEBIT D'EAU, SPECIALEMENT CONçUE POUR LES CHAUFFAGES A EAU

Country Status (9)

Country Link
EP (1) EP1218672B1 (fr)
AT (1) ATE251738T1 (fr)
AU (1) AU6691000A (fr)
DE (1) DE60005851T2 (fr)
DK (1) DK1218672T3 (fr)
ES (1) ES2208400T3 (fr)
IT (1) IT1307394B1 (fr)
PT (1) PT1218672E (fr)
WO (1) WO2001025693A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7506617B2 (en) 2007-03-09 2009-03-24 Lochinvar Corporation Control system for modulating water heater
EP2878814B1 (fr) 2013-11-29 2017-09-13 Siemens Schweiz AG Mécanisme de commande

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2347597A1 (fr) * 1976-04-09 1977-11-04 Auzolat Jean P Procede et disposi
US5043592A (en) * 1988-09-27 1991-08-27 Kwc Ag Water fitting for sanitary installations
EP0681147A1 (fr) * 1994-05-04 1995-11-08 Robert Bosch Gmbh Chauffe-eau instantané chauffé au gaz

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2347597A1 (fr) * 1976-04-09 1977-11-04 Auzolat Jean P Procede et disposi
US5043592A (en) * 1988-09-27 1991-08-27 Kwc Ag Water fitting for sanitary installations
EP0681147A1 (fr) * 1994-05-04 1995-11-08 Robert Bosch Gmbh Chauffe-eau instantané chauffé au gaz

Also Published As

Publication number Publication date
ITPD990215A1 (it) 2001-04-01
DE60005851D1 (de) 2003-11-13
DE60005851T2 (de) 2004-08-19
PT1218672E (pt) 2004-02-27
EP1218672A1 (fr) 2002-07-03
ATE251738T1 (de) 2003-10-15
AU6691000A (en) 2001-05-10
EP1218672B1 (fr) 2003-10-08
IT1307394B1 (it) 2001-11-06
ES2208400T3 (es) 2004-06-16
DK1218672T3 (da) 2004-02-16

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