EP1122498A3 - Gas appliances and control systems - Google Patents

Gas appliances and control systems Download PDF

Info

Publication number
EP1122498A3
EP1122498A3 EP01300583A EP01300583A EP1122498A3 EP 1122498 A3 EP1122498 A3 EP 1122498A3 EP 01300583 A EP01300583 A EP 01300583A EP 01300583 A EP01300583 A EP 01300583A EP 1122498 A3 EP1122498 A3 EP 1122498A3
Authority
EP
European Patent Office
Prior art keywords
thermistor
comparator
output
blower
passage
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Withdrawn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
EP01300583A
Other languages
German (de)
French (fr)
Other versions
EP1122498A2 (en
Inventor
Ronald Kenneth Russell
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.)
Smiths Group PLC
Original Assignee
Smiths Group PLC
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 Smiths Group PLC filed Critical Smiths Group PLC
Publication of EP1122498A2 publication Critical patent/EP1122498A2/en
Publication of EP1122498A3 publication Critical patent/EP1122498A3/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/06—Regulating fuel supply conjointly with draught
    • F23N1/062—Regulating fuel supply conjointly with draught using electronic means
    • 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
    • F23N5/14—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermo-sensitive resistors
    • F23N5/143—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermo-sensitive resistors using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • F23N2005/181—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using detectors sensitive to rate of flow of air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2223/00—Signal processing; Details thereof
    • F23N2223/08—Microprocessor; Microcomputer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2231/00—Fail safe
    • F23N2231/10—Fail safe for component failures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2231/00—Fail safe
    • F23N2231/26—Fail safe for clogging air inlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/02—Ventilators in stacks
    • 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

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

A gas boiler has a thermistor 12 located in a passage 51 opening into an inner enclosure 80 containing the burner 1, heat exchanger 4 and the inlet of an induced draught blower 5. Reduced pressure in the enclosure 80 generated by the blower 5 draws air along the passage 51 over the thermistor 12. A comparator 17 receives the output of the thermistor 12 and that of a second thermistor 13 protected from air flow. The output of the comparator 17, together with outputs from other safety sensors 26, is connected with a logic unit 30, which controls operation of the burner gas supply valve 3. If there is a blockage, blower failure or the like, air flow over the thermistor 12 drops causing a change in output of the comparator 17, which causes the logic unit 30 to shut off the gas supply valve 3.
EP01300583A 2000-02-02 2001-01-23 Gas appliances and control systems Withdrawn EP1122498A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB0002263.2A GB0002263D0 (en) 2000-02-02 2000-02-02 Gas appliances and control systems
GB0002263 2000-02-02

Publications (2)

Publication Number Publication Date
EP1122498A2 EP1122498A2 (en) 2001-08-08
EP1122498A3 true EP1122498A3 (en) 2004-01-21

Family

ID=9884730

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01300583A Withdrawn EP1122498A3 (en) 2000-02-02 2001-01-23 Gas appliances and control systems

Country Status (2)

Country Link
EP (1) EP1122498A3 (en)
GB (2) GB0002263D0 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6766771B1 (en) 2003-09-11 2004-07-27 The Water Heater Industry Joint Research And Development Consortium Fuel-fired water heater with dual function combustion cutoff switch in its draft structure
CN106524219A (en) * 2016-12-19 2017-03-22 大连圣鼎工业装备有限公司 Environment-friendly automatic control low-index emission gas boiler unit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0087539A1 (en) * 1982-03-03 1983-09-07 E.L.M. Leblanc, Société dite: Furnaces with mechanical extraction
JPS6284224A (en) * 1985-10-09 1987-04-17 Youei Seisakusho:Kk Hot water heater
US4951651A (en) * 1989-09-28 1990-08-28 Rheem Manufacturing Company Vent overpressurization detection system for a fuel-fired, induced draft furnace
DE9210862U1 (en) * 1991-08-16 1992-10-15 Joh. Vaillant Gmbh U. Co, 5630 Remscheid Heating device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4629113A (en) * 1984-10-05 1986-12-16 Rhr, Inc. Furnace controller
US4792089A (en) * 1985-11-26 1988-12-20 Carrier Corporation Self-correcting microprocessor control system and method for a furnace
KR900006243B1 (en) * 1986-10-16 1990-08-27 린나이 가부시기가이샤 Burner apparatus
AT401569B (en) * 1991-12-12 1996-10-25 Vaillant Gmbh HEATING DEVICE
US5865611A (en) * 1996-10-09 1999-02-02 Rheem Manufacturing Company Fuel-fired modulating furnace calibration apparatus and methods

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0087539A1 (en) * 1982-03-03 1983-09-07 E.L.M. Leblanc, Société dite: Furnaces with mechanical extraction
JPS6284224A (en) * 1985-10-09 1987-04-17 Youei Seisakusho:Kk Hot water heater
US4951651A (en) * 1989-09-28 1990-08-28 Rheem Manufacturing Company Vent overpressurization detection system for a fuel-fired, induced draft furnace
DE9210862U1 (en) * 1991-08-16 1992-10-15 Joh. Vaillant Gmbh U. Co, 5630 Remscheid Heating device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 0112, no. 89 (M - 625) 18 September 1987 (1987-09-18) *

Also Published As

Publication number Publication date
GB0102221D0 (en) 2001-03-14
GB0002263D0 (en) 2000-03-22
GB2358915A (en) 2001-08-08
EP1122498A2 (en) 2001-08-08

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