WO2000050815A1 - Sonde d'oxygene a niveaux - Google Patents

Sonde d'oxygene a niveaux Download PDF

Info

Publication number
WO2000050815A1
WO2000050815A1 PCT/US2000/004851 US0004851W WO0050815A1 WO 2000050815 A1 WO2000050815 A1 WO 2000050815A1 US 0004851 W US0004851 W US 0004851W WO 0050815 A1 WO0050815 A1 WO 0050815A1
Authority
WO
WIPO (PCT)
Prior art keywords
flame
thermocouple
oxygen
gaseous fuel
combustion air
Prior art date
Application number
PCT/US2000/004851
Other languages
English (en)
Inventor
Bill Kwok
Peter Montana, Jr.
Original Assignee
Robertshaw Controls Company
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 Robertshaw Controls Company filed Critical Robertshaw Controls Company
Priority to AU30075/00A priority Critical patent/AU3007500A/en
Priority to JP2000601371A priority patent/JP2002538402A/ja
Priority to CA002362615A priority patent/CA2362615A1/fr
Publication of WO2000050815A1 publication Critical patent/WO2000050815A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/003—Systems for controlling combustion using detectors sensitive to combustion gas properties
    • F23N5/006—Systems for controlling combustion using detectors sensitive to combustion gas properties the detector being sensitive to oxygen
    • 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
    • F23N5/107—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples using mechanical means, e.g. safety valves
    • 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
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/14—Fuel valves electromagnetically operated

Definitions

  • the present invention generally relates to controlling the flow of gas to a gas-fired
  • appliance and more particularly pertains to an oxygen depletion sensor that enables a gas
  • controller to shut off the supply of gas to the appliance when the oxygen content of the
  • combustion air falls below a preselected value.
  • thermocouple voltage generated by the thermocouple to drop below the threshold level required for
  • pilot flame temperature decreases as the oxygen level drops off.
  • thermocouple
  • the gas supply can be shut off long before a drop in oxygen level would actually cause the pilot flame to become extinguished.
  • thermocouple voltages may give rise to
  • thermocouple an unacceptably low oxygen level.
  • thermocouple could cause the thermocouple to be subjected to a cooler region of the flame.
  • thermocouple a shifting of the flame relative to the thermocouple, such as when it is distorted by a draft
  • thermocouple could similarly cause the thermocouple to be subjected to a cooler region of the flame.
  • thermocouple the main burner of a gas-fired device as the temperature actually sensed by the thermocouple
  • thermocouple is described as being conventionally installed as part of an oxygen depletion
  • thermocouple is positioned so as to be heated by the gas flame of
  • thermocouple Any voltage reduction below the 14-22 open circuit millivolt
  • thermocouple in the apparatus described in Grando et al. the thermocouple must be repositioned from out in front of the pilot to an attachment point directly on the side
  • Such sensor should be easy to manufacture and should be
  • the present invention provides an oxygen depletion sensor that offers substantial
  • the sensor is easily manufactured, very reliably
  • the present invention takes
  • thermocouple causes the difference between the voltage generated by thermocouple during high and during thermocouple
  • thermocouple output gradually drops off as the oxygen level is depleted and the difference between the voltage that is generated during combustion at acceptable
  • present invention needs only to recognize a substantial drop in the generated voltage.
  • the flame velocity of a particular gaseous fuel is indicative of how fast such gas burns
  • Flame velocity is therefore a direct function of the oxygen/fuel ratio in a mixture subject to
  • the velocity of a gas flowing from a nozzle is substantially a function of the volume
  • emission from a nozzle is substantially dependent upon the pressure drop generated by the
  • the oxygen depletion sensor of the present invention exploits these fluid dynamic
  • thermocouple By advantageously positioning a thermocouple
  • thermocouple is enveloped by the flame during combustion of such mixture at oxygen levels
  • valve that controls the flow of gas to the appliance is configured such that only a voltage in
  • thermocouple the range generated by the thermocouple while enveloped by the flame is sufficient to hold
  • thermocouple when located in the unburned zone is substantially below the threshold voltage
  • thermocouple and pilot flame impervious to slight shifts in the relative positions of the thermocouple and pilot flame as the
  • thermocouple is incapable of raising the voltage generated by the thermocouple while positioned outside
  • the present invention provides an additional benefit in that the position of the flame
  • thermocouple gives a visual indication of the oxygen content of the
  • the oxygen content will be at or above an acceptable level when the
  • thermocouple is observed as being fully enveloped by the flame. Any shift of the periphery
  • the flame is an indication of a depleted oxygen level.
  • a gap between the flame and the flame is an indication of a depleted oxygen level.
  • thermocouple during for example manual override of an automatic shutoff valve is an
  • thermocouple placement of the nozzle and thermocouple may be employed by simply resizing the inlet
  • Fig. 1 is semi-schematic view of an oxygen depletion sensor of the present invention
  • Fig. 2 is an enlarged cross-sectional view of the flame forming component of the
  • Fig. 3 is side view of the oxygen depletion sensor of the present invention with a pilot
  • Fig. 4 is a side view of the oxygen depletion sensor of the present invention with a
  • Fig. 5 is a graphic plot of the voltage versus oxygen level for a device constructed in
  • the oxygen depletion sensor of the present invention is directed to a preferred embodiment thereof.
  • the device is readily adaptable for use with different gaseous
  • the device provides a visual indication of the oxygen content that is
  • Fig. 1 is a semi-schematic representation of a preferred embodiment of the oxygen
  • thermocouple 16 maintains a thermocouple 16 in position adjacent the mouth of nozzle 18 of a flame forming
  • a gas valve 22 controls the flow of gas from a supply line 21 to both the flame forming component 20 via line 24 and to the main burner 26 of the appliance via line
  • the valve is configured such that the range of voltages generated by the thermocouple
  • thermocouple in its open position while voltages generated by the thermocouple at temperatures below
  • a spring loaded valve element is held in its open position by an electromagnet that is
  • thermocouple energized by the thermocouple.
  • thermocouple the voltage generated by the thermocouple while positioned in a pilot flame and above the
  • thermocouple positioned in the unburned zone adjacent a
  • the bracket may additionally hold an ignitor 30 in position so as to enable the gaseous
  • bracket may hold a thermopile 32 in position above the flame.
  • thermopile may be used by the valve 22 to regulate the flow of gas to the main burner 26.
  • Fig. 2 is a cross sectional view of the flame controlling component 20 of the oxygen
  • Gas line 24 supplies the component
  • Thermocouple 16 is positioned so as to be located
  • Fig.3 illustrates the oxygen depletion sensor 12 in operation when the combustion air
  • the pilot flame 40 forms and stabilizes a short
  • proximal end of the periphery of the flame approximately conforms to the loci of where the
  • flame velocity is substantially equal to the flow velocity of the combustible mixture of
  • thermocouple 16 is positioned
  • Such voltage is well above the threshold voltage selected to hold the
  • valve 22 in its open position thus allowing it to supply gas to the flame forming component
  • the configuration of the device has the added benefit of maintaining a fairly high flow
  • thermocouple 16 away from the nozzle 18 and thermocouple 16 than is possible when using a low velocity configuration. This serves to reduce the amount of radiated heat sensed by the thermocouple.
  • Fig. 4 illustrates the oxygen depletion sensor 12 in operation in an environment
  • the flame 40a forms at a position
  • thermocouple 16 is further removed from the mouth of the nozzle 18 which causes the thermocouple 16 to be
  • thermocouple any instability or lifting of the pilot flame is an indication of
  • Fig. 5 is a representative plot of thermocouple voltage versus oxygen content of the
  • thermocouple voltage generated by the thermocouple gradually decreases as the oxygen content of the
  • thermocouple is enveloped by the flame and therefore subject to very high temperatures, as
  • thermocouple sensed by the thermocouple is subject to a precipitous decline as is evidenced by the abrupt
  • thermocouple and its temperature continues to decrease.
  • the present invention is configured such that the abrupt transition zone 52 substantially
  • the gas valve is configured such that the threshold voltage necessary to
  • the oxygen depletion of the sensor of the present invention can be readily modified
  • thermocouple may be used, the same spacing between
  • thermocouple and the mouth of the nozzle may be maintained and the same overall flame
  • forming component may be employed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)
  • Regulation And Control Of Combustion (AREA)

Abstract

L'invention concerne une sonde d'oxygène à niveaux qui se fonde sur les variations de la flamme d'une veilleuse située à distance d'une buse lorsque le contenu d'oxygène de l'air comburant diminue. Un thermocouple est positionné de sorte qu'il est situé dans la flamme pendant la combustion à des niveaux d'oxygène acceptables, et dans la zone non exposée à la flamme lorsque le contenu d'oxygène est inférieur à un niveau acceptable. La grande différence de tension entre un niveau élevé et un faible niveau d'oxygène améliore la fiabilité de la sonde.
PCT/US2000/004851 1999-02-26 2000-02-24 Sonde d'oxygene a niveaux WO2000050815A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU30075/00A AU3007500A (en) 1999-02-26 2000-02-24 Oxygen depletion sensor
JP2000601371A JP2002538402A (ja) 1999-02-26 2000-02-24 酸素減少センサ
CA002362615A CA2362615A1 (fr) 1999-02-26 2000-02-24 Sonde d'oxygene a niveaux

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12190999P 1999-02-26 1999-02-26
US60/121,909 1999-02-26

Publications (1)

Publication Number Publication Date
WO2000050815A1 true WO2000050815A1 (fr) 2000-08-31

Family

ID=22399484

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/004851 WO2000050815A1 (fr) 1999-02-26 2000-02-24 Sonde d'oxygene a niveaux

Country Status (4)

Country Link
JP (1) JP2002538402A (fr)
AU (1) AU3007500A (fr)
CA (1) CA2362615A1 (fr)
WO (1) WO2000050815A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1420206A1 (fr) * 2002-11-13 2004-05-19 FAGOR, S.Coop Dispositif de détection de la combustion avec un générateur thermoélectrique
US7766006B1 (en) 2007-03-09 2010-08-03 Coprecitec, S.L. Dual fuel vent free gas heater
US8057219B1 (en) 2007-03-09 2011-11-15 Coprecitec, S.L. Dual fuel vent free gas heater
US8118590B1 (en) 2007-03-09 2012-02-21 Coprecitec, S.L. Dual fuel vent free gas heater
US8137098B2 (en) 2008-05-12 2012-03-20 Coprecitec, S.L. Multiple gas pilot burner
US8403661B2 (en) 2007-03-09 2013-03-26 Coprecitec, S.L. Dual fuel heater
US8899971B2 (en) 2010-08-20 2014-12-02 Coprecitec, S.L. Dual fuel gas heater

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57101227A (en) * 1980-12-16 1982-06-23 Matsushita Electric Ind Co Ltd Instantaneous gas water heater with prevention device against incomplete combustion
EP0100758A2 (fr) * 1982-08-03 1984-02-15 OFFICINE DI PERNUMIA di Giancarlo de' STEFANI & C. S.a.s. Dispositif de sécurité pour appareil de chauffage à gaz
JPS61105023A (ja) * 1984-10-26 1986-05-23 Rinnai Corp ガス器具の燃焼安全装置
US4718846A (en) * 1984-04-14 1988-01-12 Rinnai Corporation Combustion safety device for a gas heater
US5674065A (en) 1996-01-22 1997-10-07 Op S.R.L. Apparatus for controlling the supply of gas to and heat from unvented gas heating appliances

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57101227A (en) * 1980-12-16 1982-06-23 Matsushita Electric Ind Co Ltd Instantaneous gas water heater with prevention device against incomplete combustion
EP0100758A2 (fr) * 1982-08-03 1984-02-15 OFFICINE DI PERNUMIA di Giancarlo de' STEFANI & C. S.a.s. Dispositif de sécurité pour appareil de chauffage à gaz
US4718846A (en) * 1984-04-14 1988-01-12 Rinnai Corporation Combustion safety device for a gas heater
JPS61105023A (ja) * 1984-10-26 1986-05-23 Rinnai Corp ガス器具の燃焼安全装置
US5674065A (en) 1996-01-22 1997-10-07 Op S.R.L. Apparatus for controlling the supply of gas to and heat from unvented gas heating appliances

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 006, no. 196 (M - 161) 5 October 1982 (1982-10-05) *
PATENT ABSTRACTS OF JAPAN vol. 010, no. 286 (M - 521) 27 September 1986 (1986-09-27) *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1420206A1 (fr) * 2002-11-13 2004-05-19 FAGOR, S.Coop Dispositif de détection de la combustion avec un générateur thermoélectrique
US7766006B1 (en) 2007-03-09 2010-08-03 Coprecitec, S.L. Dual fuel vent free gas heater
US8057219B1 (en) 2007-03-09 2011-11-15 Coprecitec, S.L. Dual fuel vent free gas heater
US8061347B2 (en) 2007-03-09 2011-11-22 Coprecitec, S.L. Dual fuel vent free gas heater
US8118590B1 (en) 2007-03-09 2012-02-21 Coprecitec, S.L. Dual fuel vent free gas heater
US8403661B2 (en) 2007-03-09 2013-03-26 Coprecitec, S.L. Dual fuel heater
US8777609B2 (en) 2007-03-09 2014-07-15 Coprecitec, S.L. Dual fuel heater
USRE46308E1 (en) 2007-03-09 2017-02-14 Coprecitec, S.L. Dual fuel heater
US8137098B2 (en) 2008-05-12 2012-03-20 Coprecitec, S.L. Multiple gas pilot burner
US8899971B2 (en) 2010-08-20 2014-12-02 Coprecitec, S.L. Dual fuel gas heater

Also Published As

Publication number Publication date
CA2362615A1 (fr) 2000-08-31
AU3007500A (en) 2000-09-14
JP2002538402A (ja) 2002-11-12

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