GB2330438A - Gas heating apparatus - Google Patents

Gas heating apparatus Download PDF

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Publication number
GB2330438A
GB2330438A GB9822288A GB9822288A GB2330438A GB 2330438 A GB2330438 A GB 2330438A GB 9822288 A GB9822288 A GB 9822288A GB 9822288 A GB9822288 A GB 9822288A GB 2330438 A GB2330438 A GB 2330438A
Authority
GB
United Kingdom
Prior art keywords
carbon monoxide
sensing device
gas
sensing
thermocouple
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.)
Granted
Application number
GB9822288A
Other versions
GB2330438B (en
GB9822288D0 (en
Inventor
Robert Alan Charmer
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.)
Robinson Willey Ltd
Original Assignee
Robinson Willey Ltd
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 Robinson Willey Ltd filed Critical Robinson Willey Ltd
Publication of GB9822288D0 publication Critical patent/GB9822288D0/en
Publication of GB2330438A publication Critical patent/GB2330438A/en
Application granted granted Critical
Publication of GB2330438B publication Critical patent/GB2330438B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N5/00Systems for controlling combustion
    • F23N5/003Systems for controlling combustion using detectors sensitive to combustion gas properties
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N5/00Systems for controlling combustion
    • F23N5/24Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F23N5/245Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electrical or electromechanical means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N5/00Systems for controlling combustion
    • F23N5/02Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/10Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples

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

Abstract

A gas-fired heating apparatus including a carbon monoxide sensing device 8 which operates such that on sensing an undesired level of carbon monoxide, the device generates an alarm signal (such as an audible alarm and/or a visible alarm, such as a light source) and/or enables the operation of or operates a flame failure device (4,5) or other gas cut-off means of the heating apparatus so as to cut-off the gas supply to the main burner thereof.

Description

GAS HEATING APPARATUS The present invention relates to gas fired heating apparatus such as a gas fire.
Electrically operated carbon monoxide sensors which may be deployed in rooms where gas fires are used, are known which emit an audible alarm when an undesirable level of carbon monoxide is detected and such are independent of the gas fire and separately functioning devices.
According to the present invention a gas-fired heating apparatus includes a carbon monoxide sensing device which operates such that on sensing an undesired level of carbon monoxide, the device generates an alarm signal (such as an audible alarm and/or a visible alarm, such as a light source) and/or operates a flame failure device or other gas cut-off means of the heating apparatus so as to cut-off the gas supply to the main burner thereof.
The sensing device preferably acts to cut-off the gas supply when the carbon monoxide sensing device senses the presence of carbon monoxide in quantities greater than such required to generate an initial alarm signal i.e. by the audible and/or visible alarm means. Thus a warning is given prior to cut-off.
The sensing device is preferably adapted such as to generate two signals, an initial one indicating a lower level of carbon monoxide and a subsequent one indicating a higher level of carbon monoxide and at which the device also acts to cut-off the gas supply.
It will be appreciated that the carbon monoxide sensing device is integral with or part of the gas-fired heating appliance and not a separately wall mountable device. It is of course possible for the sensing device to be mountable on a surface adjacent the apparatus or appliance but will be electrically connected thereto.
The heating apparatus or appliance will preferably include a thermocouple heatable by the main gas burner of the and/or pilot which maintains a flame failure device open whilst sensing the presence of heat and said carbon monoxide sensing device on sensing the presence of an undesirable amount of carbon monoxide operates to interrupt the current generated by the thermocouple with the result that the gas supply is cut-off.
Preferably the sensing device will be located at or towards the bottom of the heating apparatus thereby sensing the air being used by the fire and "pulled" by the effect of the chimney or flue.
It should be appreciated that the carbon monoxide sensing device of the present invention being incorporated in a gas-fired heating apparatus or appliance, such as a gas fire, will also act to emit an alarm signal when it senses the presence of carbon monoxide generated by other appliances in the same region. For example, if another appliance such as a cooker were emitting carbon monoxide, the sensing device will first generate a warning/alarm signal if lower levels of carbon monoxide are sensed before deactivating the gas heating apparatus.
The present invention is intended to be used in combination with an apparatus having a flame failure device and preferably with an ODS pilot-flame failure device.
It is of considerable advantage that the sensing and alarm device can be and is preferably powered by a battery. It may of course alternatively be mains powered.
The present invention may be used in combination with an apparatus including a catalytic converter and/or an oxygen depletion sensor (e.g. an ODS pilot jet) so as to break the thermocouple circuit when sensing carbon monoxide, and thus the alarm device provides an increased safety factor.
The apparatus of the present invention is preferably such that the gas supply to the burner and any pilot is closed on failure of the device or running down of the battery i.e. it is a fail-safe alarm system.
It is envisaged that the carbon monoxide sensing device may be replaced by another oxygen depletion sensing device or such may be used in combination with the carbon monoxide sensing device.
The present invention is particularly intended for domestic use and for tenanted property.
The present invention will normally include a device functioning as a carbon monoxide sensing and alarm device.
The invention will be described further, by way of example, with reference to the accompanying drawing which is a diagrammatic illustration of a gas-fired heating appliance including a gas sensing device.
A domestic gas fire 1 (not illustrated in detail) includes a pilot jet burner 2 in addition to a main gas burner (not shown) which is ignited by said pilot jet flame 3 ignited by ignition means (not shown). The pilot jet burner 2 may be an oxygen-depletion-sensing pilot light burner.
A thermocouple 4 is illustrated which is energised by heat from the flame 3 and is electrically connected to an electromagnetic valve 5 biassed into the normally closed position and acting as a flame failure device, which is located in the main gas supply pipe 6 to the main burner (not shown) and has a manual opening member 7. Once the valve 5 is opened by member 7 and an electric ignition device also energised to light pilot flame 3 and the main burner, the current from the thermocouple is such as to maintain the valve 5 open unless the pilot flame should go out in the event of a gas supply failure or lack of oxygen or other undesired situation or unless the circuit from the thermocouple 4 is deliberately broken when it is desired to turn the fire off or unless a carbon monoxide unit 8 operates to break the circuit as will now be described.
The carbon monoxide detector unit 8 forms part of the gas fire 1 and is located on a lower region of the fire 1 where air is flowing to the main gas burner and is connected in series is the circuit leading to and controlling the electromagnetic valve 5 so as to normally close such when no carbon monoxide is detected. Once carbon monoxide is detected by said unit 8, it operates such that the circuit to valve 5 is broken (as illustrated) and thus the valve 5 closes and the gas supply 6 to the appliance is cut-off.
The carbon monoxide electronic detector unit 8 is battery powered and the sensing part of such is well-known per se and need not be described further except to say that the unit is preferably adapted so as not only on operation to generate a signal so as to intercept the "hold-open'! signal from the thermocouple to the valve 5, but also to emit an audible and/or visible alarm. Preferably the unit initially operates to emit a first quieter or different audible and/or a visible alarm when it senses carbon monoxide at a lower level than when it emits a louder and/or different signal on detecting a level of carbon monoxide sufficient to require the gas fire to be turnedoff for safety.
The detector unit 8 may be detachably mounted on the gas fire 1 and have wires 8' of sufficient length from a thermocouple interrupter 4' as to enable the unit to be mounted on a surface, such as a wall, adjacent the gas fire, if desired and be of a nature as to permit such wall mounting. The interrupter 4' minimizes the impedance or length of wire from the thermocouple to the flame failure device.
Various modifications or embodiments may be made without departing from the scope of the invention. For example, the carbon monoxide device may be replaced by or supplemented with an oxygen-depletion-sensing device and preferably one which operates electrically. The sensing or sensor device may be additionally coupled to turn-off the gas supply to other gas appliances and/or even the supply to the dwelling - suitable electromagnetic valves being provided and connected - preferably with interrupters to minimize the impediance for the thermocouple circuit in normal operation.

Claims (18)

  1. CLAIMS 1. A gas-fired heating apparatus including a carbon monoxide sensing device which operates such that on sensing an undesired level of carbon monoxide, the device generates an alarm signal (such as an audible alarm and/or a visible alarm, such as a light source) and/or enables the operation of or operates a flame failure device or other gas cut-off means of the heating apparatus so as to cut-off the gas supply to the main burner thereof.
  2. 2. Apparatus as claimed in claim 1, in which the sensing device acts to enable or cause valve means to close and to cut-off the gas supply to the apparatus when the carbon monoxide sensing device senses the presence of carbon monoxide in undesirable quantities.
  3. 3. Apparatus as claimed in claim 2, which includes a thermocouple located to be energisable by the flame from a pilot light burner and/or from the flames of the main burner unit with said thermocouple being electrically connected to the flame failure device or other gas cut-off means in the gas supply to the burner which means acts to close the gas supply when the pilot flame and/or main burner flame is not present and the thermocouple is thus not energised and acts to close the gas supply when the carbon monoxide sensing device generates a signal to interrupt any signal from the thermocouple.
  4. 4. Apparatus as claimed in any of claims 1 to 3, in which the sensing device is such as to generate two signals, an initial signal indicating a lower level of carbon monoxide and a subsequent signal indicating a higher level of carbon monoxide and at which the device also acts to cause the gas supply to be cut-off.
  5. 5. Apparatus as claimed in any of claims 1 to 4, in which the sensing device is electrically powered and is dismountable from the apparatus and mountable on a surface adjacent the appliance whilst remaining electrically connected to the flame failure device or other gas cut-off means of the main burner
  6. 6. Apparatus as claimed in claim 1 or claim 2 or claims 4 and 5 when dependent on claim 1 or 2, in which a thermocouple is provided heatable by the flames of the main gas burner and/or by the flame of the pilot jet burner which maintains the flame failure device or other gas cutoff means open whilst sensing the presence of heat and said carbon monoxide sensing device on sensing the presence of an undesirable amount of carbon monoxide operates to interrupt the current generated by the thermocouple with the result that the gas supply is cut-off.
  7. 7. Apparatus as claimed in any of claims 1 to 6, in which is located at or towards the bottom of the heating apparatus and in a position such as to enable it to sense the air being used by the fire and "pulled" by the effect of the chimney or flue.
  8. 8. Apparatus as claimed in any of claims 1 to 7, including an oxygen-depletion-sensitive (ODS) pilot-flame failure device.
  9. 9. Apparatus as claimed in any of claims 1 to 8, in which the sensing and alarm device is powered by a battery.
  10. 10. Apparatus as claimed in any of claims 1 to 9, which includes a catalytic converter and/or an oxygen depletion sensor (e.g. an ODS pilot jet) and said sensing device operating so as to break the thermocouple circuit when sensing carbon monoxide, to thereby provide for an increased safety.
  11. 11. Apparatus as claimed in any of claims 1 to 10, in which control means are provided such that the gas supply to the burner and any pilot is closed on failure of the carbon monoxide sensing device or running down of the battery thereof.
  12. 12. Apparatus as claimed in any of claims 1 to 11, in which instead or in place of a carbon monoxide sensing device there is an oxygen-depletion-sensing device or the carbon monoxide sensing device is used in combination with an oxygen-depletion-sensing device.
  13. 13. Gas fired apparatus including a device functioning as a carbon monoxide sensing and alarm device.
  14. 14. A gas fired heating appliance including a carbon monoxide sensing device and/or an oxygen depletion sensing device substantially as herein described with reference to the accompanying drawing.
  15. 15. A carbon monoxide sensing device including an electrical switch means connectable to a circuit to open the circuit when the device senses carbon monoxide.
  16. 16. A carbon monoxide sensing device as claimed in claim 15, being an audible alarm means and/or a visible alarm means operable upon detection of carbon monoxide.
  17. 17. A carbon monoxide sensing device as claimed in claim 16, which is such as to generate different signals from the audible alarm means and/or the visible alarm means.
  18. 18. A carbon monoxide sensing device as claimed in claim 17, in which the device is such as to generate two signals - a first when a lower level of carbon monoxide is sensed and a second more noticeable signal when an unacceptable level of carbon monoxide is detected.
GB9822288A 1997-10-14 1998-10-14 Gas heating apparatus Expired - Fee Related GB2330438B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GBGB9721654.3A GB9721654D0 (en) 1997-10-14 1997-10-14 Gas heating apparatus

Publications (3)

Publication Number Publication Date
GB9822288D0 GB9822288D0 (en) 1998-12-09
GB2330438A true GB2330438A (en) 1999-04-21
GB2330438B GB2330438B (en) 2000-02-16

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GBGB9721654.3A Pending GB9721654D0 (en) 1997-10-14 1997-10-14 Gas heating apparatus
GB9822288A Expired - Fee Related GB2330438B (en) 1997-10-14 1998-10-14 Gas heating apparatus

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GBGB9721654.3A Pending GB9721654D0 (en) 1997-10-14 1997-10-14 Gas heating apparatus

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2361997A (en) * 2000-05-04 2001-11-07 Bw Technologies Ltd Combustible gas detection
GB2372130A (en) * 2000-10-31 2002-08-14 Mulheron Maureen Monitoring system for a gas-fired boiler providing warning of a sensed condition approaching or in excess of a predetermined limit
GB2375646A (en) * 2001-05-16 2002-11-20 Monox Ltd Safety module for fuel-burning appliance, and appliance using such a safety module
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 (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4032286A (en) * 1975-04-18 1977-06-28 Matsushita Electric Industrial Co., Ltd. Gas combustion device with safety device
GB2234873A (en) * 1989-08-07 1991-02-13 Standard Microsyst Smc Four transistor pseudo-static ram cell
GB2294794A (en) * 1994-11-02 1996-05-08 William Michael Sheret Fuel leak monitoring apparatus
GB2306735A (en) * 1995-10-28 1997-05-07 Pro Tools Gas detecting safety device
GB2310942A (en) * 1996-03-04 1997-09-10 James Andrew Forster Burner with a carbon monoxide detection and automatic deactivation system
GB2313691A (en) * 1996-05-31 1997-12-03 Zellweger Analytics Ltd Heater with CO gas sensor

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU603689B2 (en) * 1987-07-30 1990-11-22 Boral Energy Asset Management Pty Limited Flueless combustion safety system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4032286A (en) * 1975-04-18 1977-06-28 Matsushita Electric Industrial Co., Ltd. Gas combustion device with safety device
GB2234873A (en) * 1989-08-07 1991-02-13 Standard Microsyst Smc Four transistor pseudo-static ram cell
GB2294794A (en) * 1994-11-02 1996-05-08 William Michael Sheret Fuel leak monitoring apparatus
GB2306735A (en) * 1995-10-28 1997-05-07 Pro Tools Gas detecting safety device
GB2310942A (en) * 1996-03-04 1997-09-10 James Andrew Forster Burner with a carbon monoxide detection and automatic deactivation system
GB2313691A (en) * 1996-05-31 1997-12-03 Zellweger Analytics Ltd Heater with CO gas sensor

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2361997A (en) * 2000-05-04 2001-11-07 Bw Technologies Ltd Combustible gas detection
US6442994B1 (en) 2000-05-04 2002-09-03 Bw Technologies Limited Instrument for combustible gas detection
GB2372130A (en) * 2000-10-31 2002-08-14 Mulheron Maureen Monitoring system for a gas-fired boiler providing warning of a sensed condition approaching or in excess of a predetermined limit
GB2372130B (en) * 2000-10-31 2005-04-20 Mulheron Maureen Monitoring system
GB2375646A (en) * 2001-05-16 2002-11-20 Monox Ltd Safety module for fuel-burning appliance, and appliance using such a safety module
EP1258680A2 (en) * 2001-05-16 2002-11-20 Monox Limited Safety module for fuel-burning appliance, and appliance using such a module
EP1258680A3 (en) * 2001-05-16 2004-12-29 Monox Limited Safety module for fuel-burning appliance, and appliance using such a module
US8057219B1 (en) 2007-03-09 2011-11-15 Coprecitec, S.L. Dual fuel vent free gas heater
US7766006B1 (en) 2007-03-09 2010-08-03 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
GB2330438B (en) 2000-02-16
GB9721654D0 (en) 1997-12-10
GB9822288D0 (en) 1998-12-09

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 20081014