EP0635680A1 - Eine Antriebvorrichtung für einen Gasbrenner mit einer Flammenüberwachung und einem elektromagnetische Regelventil - Google Patents

Eine Antriebvorrichtung für einen Gasbrenner mit einer Flammenüberwachung und einem elektromagnetische Regelventil Download PDF

Info

Publication number
EP0635680A1
EP0635680A1 EP94201400A EP94201400A EP0635680A1 EP 0635680 A1 EP0635680 A1 EP 0635680A1 EP 94201400 A EP94201400 A EP 94201400A EP 94201400 A EP94201400 A EP 94201400A EP 0635680 A1 EP0635680 A1 EP 0635680A1
Authority
EP
European Patent Office
Prior art keywords
actuator
valve
shutter
flame
pilot flame
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Withdrawn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
EP94201400A
Other languages
English (en)
French (fr)
Inventor
Gian Piero Turrin
Roberto Mozzato
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 EP0635680A1 publication Critical patent/EP0635680A1/de
Withdrawn legal-status Critical Current

Links

Images

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
    • F23N5/10—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples
    • F23N5/105—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples using electrical or electromechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature
    • F23N2225/12—Measuring temperature room temperature
    • 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
    • F23N2235/18—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
    • 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
    • F23N2235/24—Valve details

Definitions

  • the present invention relates to a flame-safeguarded thermostatically regulated gas burner actuator.
  • the actuators are provided with protections, and comprise two cascaded shutoff valves, a first safety valve being preferably controlled, but not limited thereto, by a pilot flame detector, which flame is to be constantly lit, a second regulator valve being controlled by a thermostatic device which generally applies a regulation of the on/off type by opening and closing electric contacts which allow an electromagnet driver for the regulator valve to be energized intermittently.
  • a further requirement of the actuators is a capability for self-supported operation, whereby they can operate without requiring an external power source.
  • twin shutoff valve actuators wherein a first safety valve is driven by an electromagnetic assembly powered from a thermocouple heated by the pilot flame.
  • the assembly is set manually, whereupon the safety valve is opened and gas is admitted to the nozzle of the pilot flame, which may be lighted using piezoelectric spark-making devices or another equivalent means.
  • the safety valve is then held open by the current flowing through the electromagnetic winding on account of the thermoelectric electromotive force generated by the thermocouple.
  • Retention of the open state is ensured a few seconds after the pilot flame is ignited, as necessary to heat up the thermocouple and its protective case which have low thermal inertia.
  • thermocouple current decreases rapidly and is no longer able to oppose the force exerted by a bias spring of the electromagnetic assembly and for closing the safety valve, which is therefore promptly shut off.
  • the mechanical power for setting and loading the spring is supplied by the operator and to retain the open condition the small power, on the order of few milliwatts, provided by the thermocouple is sufficient, since no work is involved.
  • the regulator valve is generally driven by an electromagnet which is supplied electric power from the mains through a thermostatic switch, and possibly an isolation and voltage stepdown transformer.
  • the actuator operation is therefore dependent on the availability of an electric power supply network and the presence of a voltage on the network.
  • thermocouple powering the electromagnetic safety assembly is replaced with a thermopile, that is a plurality of thermocouples in series, capable of supplying an electric power at least one order larger than that from a thermocouple.
  • thermopile additionally to powering the electromagnetic safety assembly, also powers, through a thermostatic switch, the electromagnet driving the regulator valve, obviously using a circuit in parallel with that of the safety assembly.
  • thermopile is of necessity a composite element with several junctions contained within a much larger protective case than that required for a themocouple and on the whole, has much higher (at least one order higher) thermal inertia than a thermocouple, both on heating and cooling.
  • a mercury vapor thermostat has a thermal inertia and a response time comparable with that of a thermocouple device and the safety time can be brought back to acceptable levels.
  • thermocouple to power the safety assembly and a thermopile to power the driving electromagnet for the regulator valve.
  • control of the regulator valve is achieved by means of a servosystem which utilizes the delivery pressure of the fuel gas as a source of energy, to thereby minimize the power requirement on the thermopile for controlling the regulator valve.
  • the actuator of the invention includes a valve body 1 usually comprised of one or more die castings, which forms a gas inlet union 2 communicated to an outlet union 3 through an inner channel 4.
  • the gas flow from the union 2 to the channel 4 is controlled by a moving shutter 5, which when at rest, through the action of a spring 6, closes a passageway between the union 2 and the channel 4.
  • the gas flow from the channel 4 to the union 3 is controlled by a moving shutter 7, which when at rest, through the action of a spring 8 closes a passageway between the channel 4 and the union 3.
  • the shutter 5 is rigid with an axially movable drive rod 9 attached to the moving armature 10 of an electromagnet 11 housed within the body 1 and whose winding circuit is closed by a thermocouple 12.
  • a tapping conduit 15 open to the inner channel 4 is terminated with a possibly multiple pilot flame feed nozzle 16 facing the thermocouple 12.
  • a setting pushbutton 17 rigid with the rod 13 By exerting a manual pressure on a setting pushbutton 17 rigid with the rod 13, the latter is brought to interfere with the shutter 5, which will be pushed into an open position with the armature 10 in contact with the poles of the electromagnet 11.
  • the gas introduced into the union 2 may then flow into the channel 4, and through the conduit 15, feed the nozzle 16 to ignite a pilot flame 18, using known means.
  • thermocouple 12 when heated by the pilot flame, generates an electromotive force, and hence a current through the winding of the electromagnet 11 which holds the armature 10 to the closed position and the shutter 5 correspondingly to the open position, even when the setting action applied by the rod 13 is discontinued.
  • thermocouple When for a reason whatever the pilot flame 18 goes off, the thermocouple is cooled rapidly, within few seconds, and the armature 10, being no longer withheld by the magnetic attraction force, is released to close the shutter 5.
  • the regulating function of the actuator is performed by the shutter 7, which being coupled to the moving core 19 of an electromagnet 20, e.g. of the draw-in type, can be brought to an open or a closed condition, according to whether the electromagnet 20 resists or assists when energized the force applied by the spring 8 which tends to hold the shutter 7 to its closed position.
  • an electromagnet 20 e.g. of the draw-in type
  • thermocouple To open the shutter 7, a mechanical work must be performed which the power developed by a thermocouple cannot accomplish.
  • thermopile 21 which being heated by a second pilot flame 18A (or by the pilot flame 18 itself) will power the winding of the electromagnet 20 through a regulating thermostatic switch 22.
  • the actuator of the invention while retaining the necessary speed of operation of the safety valve formed of the shutter 5, can perform a regulating function, as applied by the shutter 7, with no need for an external power supply, the energy being obtained by thermoelectric conversion from the power of the pilot flame.
  • Figure 2 shows a preferred embodiment of the actuator according to the invention which combines the aforementioned advantages with other important advantages.
  • the body 23 of the actuator accommodates a safety electromagnetic assembly 24 and associated shutter 25 quite similar to the one described and depicted in Figure 1, although the regulating function is obtained in a more elaborate manner.
  • the shutter 26, being the equivalent of the shutter 7 in Figure 1, is controlled by a diaphragm actuator linked operatively to an electromagnetic device, rather than by an electromagnet.
  • the inner channel 28 included between the shutter 25 and the shutter 26 is communicated, as well as to a feed conduit 29 for the pilot flame 30, to a regulating chamber 31 through a conduit 32, closed at its ends by a consent shutter 33 and a regulating shutter 34.
  • the consent shutter 33 being biased to the closed position by a spring 35, is held normally open by a cap 36 attached to a setting rod 37 rigid with a setting knob 38.
  • the stem 37 Upon rotation of the knob 38, provided with a detent dog 39 co-operating with a helical shoulder 40 on the body 23, the stem 37, additionally to being rotated, is pushed to interfere with the shutter 25 causing it to open and the assembly 24 to be set.
  • the cap 36 which normally holds the shutter 33 open, is lowered to allow the shutter 33 to move into a closed position.
  • the regulating shutter 34 is carried on an extension arm 85 of a moving armature 86 of an electromagnet, consisting of a yoke 87 linked to a winding 88.
  • a spring 89 biases the armature 86 to the open position corresponding with the closed position of the shutter 34.
  • the winding 88 is energized through a thermostatic switch 41 from a thermopile 50 heated by the pilot flame.
  • the chamber 31 is communicated by means of a conduit 42 to an actuation chamber 43, closed by an actuating diaphragm 44 which acts on the shutter 26.
  • the opposite face of the diaphragm 44 is exposed to the outlet conduit 45 of the actuator, which feeds in a known manner, by a nozzle and a diffuser, a plurality of burner ports.
  • a discharge opening 46 connects the chamber 31 to the chamber 45.
  • the shutter 34 On energization of the electromagnet 88, the shutter 34 is opened, and if the shutter 33 is also open, the chamber 31 and chamber 43, being fed combustion gas, reach a pressure very near the gas delivery pressure and ensured by the loss of head which occurs at the discharge opening 46.
  • the pressure differential which establishes in a gradual fashion across faces of the diaphragm causes the shutter 26 to open gradually and the gas to flow to the burner ports.
  • the shutter should cause a head loss which ensures across the diaphragm 44 the pressure differential required to counteract the thrust from the spring 47 and the thrusts acting on the shutter 26.
  • thermopiles the power required of the regulating electromagnet can be kept within extremely low limits and provided, therefore, by thermopiles.
  • the shutter 34 Upon the winding 88 being de-energized, the shutter 34 will close at once and the pressure within the chambers 31, 43 decrease rapidly as a function of the outflow rate through the discharge opening, so that the shutter 26 will close almost instantaneously.
  • winding 88 and the yoke 87 may be accommodated fully inside the body 23.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)
  • Magnetically Actuated Valves (AREA)
EP94201400A 1993-07-20 1994-05-18 Eine Antriebvorrichtung für einen Gasbrenner mit einer Flammenüberwachung und einem elektromagnetische Regelventil Withdrawn EP0635680A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT93MI001595A IT1264955B1 (it) 1993-07-20 1993-07-20 Azionatore per bruciatore a gas con sicurezza di fiamma ed elettrovalvola di regolazione.
ITMI931595 1993-07-20

Publications (1)

Publication Number Publication Date
EP0635680A1 true EP0635680A1 (de) 1995-01-25

Family

ID=11366636

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94201400A Withdrawn EP0635680A1 (de) 1993-07-20 1994-05-18 Eine Antriebvorrichtung für einen Gasbrenner mit einer Flammenüberwachung und einem elektromagnetische Regelventil

Country Status (2)

Country Link
EP (1) EP0635680A1 (de)
IT (1) IT1264955B1 (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999011979A1 (en) * 1997-08-28 1999-03-11 Aktiebolaget Electrolux A safety cut-off device
WO1999022175A1 (de) 1997-10-23 1999-05-06 Mertik Maxitrol Gmbh & Co. Kg Gasregelarmatur
WO2000057107A1 (de) 1999-03-22 2000-09-28 Mertik Maxitrol Gmbh & Co. Kg Gasregelarmatur
EP1058060A1 (de) * 1999-06-02 2000-12-06 Sit la Precisa S.p.a. Ventileinheit zur Regelung des Gas-Versorgungsdruckes
WO2001038789A1 (en) * 1999-11-23 2001-05-31 Honeywell Inc. Stepper motor driving a linear actuator operating a pressure control regulator
EP1106922A1 (de) * 1999-12-02 2001-06-13 Vanni Gallocchio Sicherheits- und Durchflussregelventil, insbesondere für ein Gas
US6322352B1 (en) * 1998-06-10 2001-11-27 Isphording Germany Gmbh Gas burner system
ES2167166A1 (es) * 1999-07-30 2002-05-01 Fagor S Coop Disposicion de valvulas para la regulacion del gas en un fuego de calefaccion.
WO2002035152A1 (en) * 2000-10-23 2002-05-02 Sit La Precisa S.P.A. A device for the management and the control of a burner in general
WO2006069686A1 (en) * 2004-12-29 2006-07-06 Coprecitec, S.L. Control system for a gas cooking device
ITPD20100385A1 (it) * 2010-12-21 2012-06-22 Sit La Precisa S P A Con Socio Uni Co Dispositivo per il controllo dell'erogazione di un gas combustibile verso un bruciatore, particolarmente per apparecchi riscaldatori di acqua

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2384696A (en) * 1943-02-01 1945-09-11 William A Ray Control system
FR1232440A (fr) * 1959-04-21 1960-10-07 Theobald Ets A Dispositif de sécurité positive totale pour brûleurs à gaz
US2999536A (en) * 1955-11-17 1961-09-12 Baso Inc Flow control device
DE1158016B (de) * 1956-03-07 1963-11-28 Baso Inc Elektromagnetische Vorrichtung zum Steuern der Gaszufuhr zu einer Gasbrenneranlage
US3151660A (en) * 1960-02-05 1964-10-06 Robertshaw Controls Co Fluid flow control devices
EP0433528A1 (de) * 1989-12-19 1991-06-26 Paul Isphording Metallwerke GmbH. & Co. KG Regelvorrichtung mit zwei durchflussgesteuerten Ausgängen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2384696A (en) * 1943-02-01 1945-09-11 William A Ray Control system
US2999536A (en) * 1955-11-17 1961-09-12 Baso Inc Flow control device
DE1158016B (de) * 1956-03-07 1963-11-28 Baso Inc Elektromagnetische Vorrichtung zum Steuern der Gaszufuhr zu einer Gasbrenneranlage
FR1232440A (fr) * 1959-04-21 1960-10-07 Theobald Ets A Dispositif de sécurité positive totale pour brûleurs à gaz
US3151660A (en) * 1960-02-05 1964-10-06 Robertshaw Controls Co Fluid flow control devices
EP0433528A1 (de) * 1989-12-19 1991-06-26 Paul Isphording Metallwerke GmbH. & Co. KG Regelvorrichtung mit zwei durchflussgesteuerten Ausgängen

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999011979A1 (en) * 1997-08-28 1999-03-11 Aktiebolaget Electrolux A safety cut-off device
WO1999022175A1 (de) 1997-10-23 1999-05-06 Mertik Maxitrol Gmbh & Co. Kg Gasregelarmatur
DE19746788C1 (de) * 1997-10-23 1999-05-12 Mertik Maxitrol Gmbh & Co Kg Gasregelarmatur
US6322352B1 (en) * 1998-06-10 2001-11-27 Isphording Germany Gmbh Gas burner system
WO2000057107A1 (de) 1999-03-22 2000-09-28 Mertik Maxitrol Gmbh & Co. Kg Gasregelarmatur
EP1058060A1 (de) * 1999-06-02 2000-12-06 Sit la Precisa S.p.a. Ventileinheit zur Regelung des Gas-Versorgungsdruckes
ES2167166A1 (es) * 1999-07-30 2002-05-01 Fagor S Coop Disposicion de valvulas para la regulacion del gas en un fuego de calefaccion.
WO2001038789A1 (en) * 1999-11-23 2001-05-31 Honeywell Inc. Stepper motor driving a linear actuator operating a pressure control regulator
EP1106922A1 (de) * 1999-12-02 2001-06-13 Vanni Gallocchio Sicherheits- und Durchflussregelventil, insbesondere für ein Gas
WO2002035152A1 (en) * 2000-10-23 2002-05-02 Sit La Precisa S.P.A. A device for the management and the control of a burner in general
WO2006069686A1 (en) * 2004-12-29 2006-07-06 Coprecitec, S.L. Control system for a gas cooking device
EP1684015A1 (de) * 2004-12-29 2006-07-26 FAGOR, S.Coop Steuersystem für einen Gaskocher
US7637476B2 (en) 2004-12-29 2009-12-29 Coprecitec, S.L. Control system for a gas cooking device
AU2005321552B2 (en) * 2004-12-29 2010-01-07 Coprecitec, S.L. Control system for a gas cooking device
ITPD20100385A1 (it) * 2010-12-21 2012-06-22 Sit La Precisa S P A Con Socio Uni Co Dispositivo per il controllo dell'erogazione di un gas combustibile verso un bruciatore, particolarmente per apparecchi riscaldatori di acqua

Also Published As

Publication number Publication date
IT1264955B1 (it) 1996-10-17
ITMI931595A0 (it) 1993-07-20
ITMI931595A1 (it) 1995-01-20

Similar Documents

Publication Publication Date Title
US5674065A (en) Apparatus for controlling the supply of gas to and heat from unvented gas heating appliances
US20120160186A1 (en) Device for controlling the supply of fuel gas to a burner , in particular for water heater appliances
USRE30936E (en) Safety control for furnace burner
EP0635680A1 (de) Eine Antriebvorrichtung für einen Gasbrenner mit einer Flammenüberwachung und einem elektromagnetische Regelventil
US2265294A (en) Control system
US2384696A (en) Control system
US3711236A (en) Gas burner control device with low pressure cutoff
US2329682A (en) Burner control apparatus
US2391753A (en) Safety control and ignition system
US2919858A (en) Flow control device
US4511326A (en) Gas-supply system for catalytic gas burners
US4529373A (en) Burner safety ignition system allowing for electrical and manual operation
US3489350A (en) Thermostatically controlled burner valve with high and low feed rates
US4806095A (en) Fuel valve control system
US7507085B2 (en) Gas regulating fitting
US2753931A (en) Gas-burner control system
US8668490B2 (en) Method and arrangement for igniting a gas flow
US3813033A (en) Heating control system
US2296340A (en) Safety control apparatus for gaseous fuel burners
US2885151A (en) Tpimppwatttow
US2458014A (en) Thermocouple safety pilot switch
US2393427A (en) Safety valve
US3091285A (en) Gas burner safety and regulator control valve system
US3138194A (en) Multiple burner heating system
US2510264A (en) Safety control and ignition apparatus for gaseous fuel burners

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB

17P Request for examination filed

Effective date: 19941212

17Q First examination report despatched

Effective date: 19960311

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19970219