EP0573222A1 - Heating appliances - Google Patents

Heating appliances Download PDF

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Publication number
EP0573222A1
EP0573222A1 EP93304162A EP93304162A EP0573222A1 EP 0573222 A1 EP0573222 A1 EP 0573222A1 EP 93304162 A EP93304162 A EP 93304162A EP 93304162 A EP93304162 A EP 93304162A EP 0573222 A1 EP0573222 A1 EP 0573222A1
Authority
EP
European Patent Office
Prior art keywords
gas
pilot
burner
main
gas valve
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Withdrawn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
EP93304162A
Other languages
German (de)
French (fr)
Inventor
Richard Arthur George Kinge
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.)
BLUE CIRCLE HEATING Ltd (formerly MYSON GROUP PLC)
Original Assignee
BLUE CIRCLE HEATING Ltd (formerly MYSON 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 BLUE CIRCLE HEATING Ltd (formerly MYSON GROUP PLC) filed Critical BLUE CIRCLE HEATING Ltd (formerly MYSON GROUP PLC)
Publication of EP0573222A1 publication Critical patent/EP0573222A1/en
Withdrawn legal-status Critical Current

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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
    • F23N5/022—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium 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
    • F23N5/20—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays
    • F23N5/203—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays using electronic means
    • 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
    • F23N2227/00—Ignition or checking
    • F23N2227/22—Pilot burners
    • F23N2227/24—Pilot burners the pilot burner not burning continuously
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/28—Ignition circuits
    • F23N2227/30—Ignition circuits for pilot burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/36—Spark ignition, e.g. by means of a high voltage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2229/00—Flame sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/06—Ventilators at the air intake
    • 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
    • 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
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel

Definitions

  • This invention relates to heating appliances, and more especially to gas fired heating appliances such as hot water boilers for gas central heating systems. It is especially concerned with control systems for use in such heating appliances.
  • the Permanent Pilot system already widely used on gas boilers has the advantage of being cost effective and rapid in its response to a demand for heat. Unfortunately, the system possesses a significant disadvantage in that the pilot consumes costly gas continuously.
  • the Full Sequence Control system does not waste pilot gas when there is no heat demand, but invariably takes longer to initiate a light up when a call is made. Also the system is much more complicated and costly to produce.
  • a gas fired heating appliance comprising a main burner and a pilot burner, a main gas valve for controlling the supply of gas to said main gas burner, a pilot gas valve for controlling the supply of gas to said pilot gas burner, and a control system operable in response to an external signal for causing said pilot gas burner to be lit, and when lit for causing an output signal to be generated for application to said main gas valve, said appliance including an internal thermostat for connecting said output signal to said main gas valve whereby said pilot gas valve operates to supply gas to said pilot gas burner only in response to said external signal, and said main gas valve operates to supply gas to said main burner only in response to said external signal and the operation of said internal thermostat.
  • said control system incorporates a full sequence control.
  • said main gas valve is supplied with gas from said pilot gas valve.
  • a heating appliance in accordance with the preferred form of the invention offers all of the advantages of a full sequence control system AND a reduction in full sequence ignition attempts which cuts down noise, system wear, and electrical interference generation by, for example, the ignition spark generator.
  • a control system may be described by the general term "Semi-Permanent Pilot".
  • FIG. 1 is a block schematic diagram of a control system for use in a heating appliance in accordance with the present invention.
  • the control system shown in the drawing employs a full sequence control 2 which supervises the safe light-up of a pilot burner 7 and subsequently a main burner 10.
  • the full sequence control is operated in conjunction with the components shown, such as a fan 3 to provide the air supply for combustion, an air pressure switch 4 to signal to the control 2 that the fan 3 is operating adequately, and an igniting electrode or filament 5 for the lighting the pilot burner 7 and which may or may not be combined in function with a flame sensor 6 for sensing the presence of a flame on the pilot burner 7.
  • the output at point 13 would normally be applied directly to the main gas valve 8 which feeds gas to the main gas burner 10, which is subsequently caused to be lit by the pilot burner 7.
  • the main burner 10 remains lit until the call for heat 1 is removed.
  • the call for heat 1 applied to the full sequence control 2 may typically be derived from a time switch, an external e.g. room thermostat, or an internal appliance thermostat. In this way, whenever there is a call for heat 1 applied to the full sequence control 2, whether this be derived externally or internally, a full light-up routine is used to light the main burner 10.
  • the pilot burner 7 is caused to be lit, and when the flame thereof has been sensed by the flame sensor 6, an output is afforded at point 13 of the control 2.
  • the appliance thermostat 12 is closed, i.e. calling for heat after this point, the signal from point 13 will be applied to the main gas valve 8 to feed gas to the main burner 10 to enable full operation of the appliance.
  • the appliance thermostat 12 is open at this point, i.e. the appliance temperature is above its minimum limit, no signal will be applied to the main gas valve 8, and the light-up routine which would normally have been expected is obviated.
  • the semi-permanent pilot system here described produces less electrical and audible noise, is faster in response to internal thermostat heat demands and produces less wear on the controls than a conventional full sequence system where each internal demand instigates a full light-up routine. Also, the use of fuel gas is reduced from that consumed by the permanent pilot system.
  • heating appliance control system which has been described is particularly applicable to heating appliances incorporating full system control, it should be appreciated that all aspects of a conventional full sequence control are not essential for implementing the invention.
  • the fan 3 and air pressure switch 4 may be dispensed with.

Abstract

A gas fired heating appliance comprises a main gas burner 10 and a pilot gas burner 7, a main gas valve 8 for controlling the supply of gas to the main gas burner 10, a pilot gas valve 9 for controlling the supply of gas to the pilot gas burner 7, and a full sequence control 2 operable in response to an external signal 1 for causing the pilot gas burner 7 to be lit, and when lit for causing an output signal 13 to be generated for application to the main gas valve 8, the appliance including an internal thermostat 12 for connecting the output signal 13 to the main gas valve 8 whereby the pilot gas valve 9 operates to supply gas to the pilot gas burner 7 only in response to the external signal 1, and the main gas valve 8 operates to supply gas to the main gas burner 10 only in response to the external signal 1 and the operation of said internal thermostat 12.

Description

  • This invention relates to heating appliances, and more especially to gas fired heating appliances such as hot water boilers for gas central heating systems. It is especially concerned with control systems for use in such heating appliances.
  • Traditionally gas heating appliances have employed either "Permanent Pilot" or "Full Sequence Control" ignition systems to initiate the combustion process in response to the call for heat.
  • The Permanent Pilot system already widely used on gas boilers has the advantage of being cost effective and rapid in its response to a demand for heat. Unfortunately, the system possesses a significant disadvantage in that the pilot consumes costly gas continuously.
  • The Full Sequence Control system, on the other hand, does not waste pilot gas when there is no heat demand, but invariably takes longer to initiate a light up when a call is made. Also the system is much more complicated and costly to produce.
  • It is an object of the present invention to provide a gas heating appliance which combines some of the features of a Full Sequence Control system and a Permanent Pilot system to afford a number of benefits.
  • According to the present invention there is provided a gas fired heating appliance comprising a main burner and a pilot burner, a main gas valve for controlling the supply of gas to said main gas burner, a pilot gas valve for controlling the supply of gas to said pilot gas burner, and a control system operable in response to an external signal for causing said pilot gas burner to be lit, and when lit for causing an output signal to be generated for application to said main gas valve, said appliance including an internal thermostat for connecting said output signal to said main gas valve whereby said pilot gas valve operates to supply gas to said pilot gas burner only in response to said external signal, and said main gas valve operates to supply gas to said main burner only in response to said external signal and the operation of said internal thermostat.
  • In a preferred arrangement according to the invention, said control system incorporates a full sequence control.
  • Advantageously, said main gas valve is supplied with gas from said pilot gas valve.
  • A heating appliance in accordance with the preferred form of the invention offers all of the advantages of a full sequence control system AND a reduction in full sequence ignition attempts which cuts down noise, system wear, and electrical interference generation by, for example, the ignition spark generator. Such a control system may be described by the general term "Semi-Permanent Pilot".
  • An exemplary embodiment of the invention will now be described, reference being made to the accompanying single figure drawing which is a block schematic diagram of a control system for use in a heating appliance in accordance with the present invention.
  • The control system shown in the drawing employs a full sequence control 2 which supervises the safe light-up of a pilot burner 7 and subsequently a main burner 10. Usually, thought not essentially, the full sequence control is operated in conjunction with the components shown, such as a fan 3 to provide the air supply for combustion, an air pressure switch 4 to signal to the control 2 that the fan 3 is operating adequately, and an igniting electrode or filament 5 for the lighting the pilot burner 7 and which may or may not be combined in function with a flame sensor 6 for sensing the presence of a flame on the pilot burner 7.
  • The operating logic of such an arrangement is well known and need not be described in detail here, but essentially when a call for heat 1 is applied to the system, the pilot burner 7 will be fed with fuel gas from the supply 11 by the opening of gas valve 9. When the source of ignition energy 5 has ignited the pilot flame at burner 7, the flame will be detected by the flame sensor 6 to halt the ignition process and, via the full sequence control 2, provide an output at point 13 thereof.
  • In conventional heating appliances, the output at point 13 would normally be applied directly to the main gas valve 8 which feeds gas to the main gas burner 10, which is subsequently caused to be lit by the pilot burner 7. The main burner 10 remains lit until the call for heat 1 is removed. The call for heat 1 applied to the full sequence control 2 may typically be derived from a time switch, an external e.g. room thermostat, or an internal appliance thermostat. In this way, whenever there is a call for heat 1 applied to the full sequence control 2, whether this be derived externally or internally, a full light-up routine is used to light the main burner 10.
  • There is now proposed a modification of the system which has thus far been described in that the internal appliance thermostat, shown at 12 in the drawing, is connected between the output 13 of the full sequence control 2 and the main gas valve 8, and only external demands for heat, e.g. from a time switch or room thermostat, are applied to the input 1 of the control 2.
  • Thus, when an external call for heat 1 is applied, the pilot burner 7 is caused to be lit, and when the flame thereof has been sensed by the flame sensor 6, an output is afforded at point 13 of the control 2. If the appliance thermostat 12 is closed, i.e. calling for heat after this point, the signal from point 13 will be applied to the main gas valve 8 to feed gas to the main burner 10 to enable full operation of the appliance. If the appliance thermostat 12 is open at this point, i.e. the appliance temperature is above its minimum limit, no signal will be applied to the main gas valve 8, and the light-up routine which would normally have been expected is obviated.
  • It may be seen from this that the typical frequent ON/OFF operation of the appliance thermostat 12 now merely controls the main gas burner 10, leaving the pilot burner 7 on for the generally longer periods where the external call for heat 1 remains.
  • The semi-permanent pilot system here described produces less electrical and audible noise, is faster in response to internal thermostat heat demands and produces less wear on the controls than a conventional full sequence system where each internal demand instigates a full light-up routine. Also, the use of fuel gas is reduced from that consumed by the permanent pilot system.
  • Although the heating appliance control system which has been described is particularly applicable to heating appliances incorporating full system control, it should be appreciated that all aspects of a conventional full sequence control are not essential for implementing the invention. For example, in the control system shown in the drawing the fan 3 and air pressure switch 4 may be dispensed with.

Claims (3)

  1. A gas fired heating appliance comprising a main gas burner and a pilot gas burner, a main gas valve for controlling the supply of gas to said main gas burner, a pilot gas valve for controlling the supply of gas to said pilot gas burner, and a control system operable in response to an external signal for causing said pilot gas burner to be lit, and when lit for causing an output signal to be generated for application to said main gas valve, said appliance including an internal thermostat for connecting said output signal to said main gas valve whereby said pilot gas valve operates to supply gas to said pilot gas burner only in response to said external signal, and said main gas valve operates to supply gas to said main burner only in response to said external signal and the operation of said internal thermostat.
  2. A heating appliance as claimed in claim 1, in which said control system incorporates a full sequence control.
  3. A heating appliance as claimed in claim 1 or claim 2, in which said main gas valve is supplied with gas from said pilot gas valve.
EP93304162A 1992-05-30 1993-05-28 Heating appliances Withdrawn EP0573222A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9211825 1992-05-30
GB929211825A GB9211825D0 (en) 1992-05-30 1992-05-30 Heating appliances

Publications (1)

Publication Number Publication Date
EP0573222A1 true EP0573222A1 (en) 1993-12-08

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ID=10716525

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93304162A Withdrawn EP0573222A1 (en) 1992-05-30 1993-05-28 Heating appliances

Country Status (2)

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EP (1) EP0573222A1 (en)
GB (2) GB9211825D0 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0727613A1 (en) * 1995-02-20 1996-08-21 John Stuart Fleming Method and apparatus for the control of flammable fluid heating apparatus
EP0837283A1 (en) * 1996-10-16 1998-04-22 SIT LA PRECISA S.r.l. An automatic control system with double safety protection for intermittently-operated gas burners
CN106196163A (en) * 2016-08-02 2016-12-07 贵州钢绳股份有限公司 Burner electric control system for the heating of descaling bath immersion trough

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2283565B (en) * 1993-11-04 1997-10-15 Blue Circle Heating Ltd Fuel burning appliances

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5849827A (en) * 1981-09-19 1983-03-24 Rinnai Corp Combustion controller
JPS5875620A (en) * 1981-10-29 1983-05-07 Matsushita Electric Ind Co Ltd Combustion control circuit
JPH01318809A (en) * 1988-06-17 1989-12-25 Matsushita Electric Ind Co Ltd Thermal power switching device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB589963A (en) * 1944-07-05 1947-07-04 Robertshaw Thermostat Co Improvements in or relating to safety control systems for heating apparatus
CA1051768A (en) * 1974-10-07 1979-04-03 Elmer A. Carlson Spark ignited recycling ignition system with interlocking gas valve control

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5849827A (en) * 1981-09-19 1983-03-24 Rinnai Corp Combustion controller
JPS5875620A (en) * 1981-10-29 1983-05-07 Matsushita Electric Ind Co Ltd Combustion control circuit
JPH01318809A (en) * 1988-06-17 1989-12-25 Matsushita Electric Ind Co Ltd Thermal power switching device

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 007, no. 133 (M - 221) 10 June 1983 (1983-06-10) *
PATENT ABSTRACTS OF JAPAN vol. 007, no. 169 (M - 231) 26 July 1983 (1983-07-26) *
PATENT ABSTRACTS OF JAPAN vol. 014, no. 121 (M - 946) 7 March 1990 (1990-03-07) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0727613A1 (en) * 1995-02-20 1996-08-21 John Stuart Fleming Method and apparatus for the control of flammable fluid heating apparatus
EP0837283A1 (en) * 1996-10-16 1998-04-22 SIT LA PRECISA S.r.l. An automatic control system with double safety protection for intermittently-operated gas burners
CN106196163A (en) * 2016-08-02 2016-12-07 贵州钢绳股份有限公司 Burner electric control system for the heating of descaling bath immersion trough
CN106196163B (en) * 2016-08-02 2018-06-12 贵州钢绳股份有限公司 For the burner electric control system of descaling bath immersion trough heating

Also Published As

Publication number Publication date
GB2267336B (en) 1994-05-18
GB2267336A (en) 1993-12-01
GB9211825D0 (en) 1992-07-15
GB9311019D0 (en) 1993-07-14

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