CA1187397A - System for automatic ignition, through an intermittently operating pilot flame burner of the main burner of a gas fired appliance, using a thermo- element as a signal emitter - Google Patents
System for automatic ignition, through an intermittently operating pilot flame burner of the main burner of a gas fired appliance, using a thermo- element as a signal emitterInfo
- Publication number
- CA1187397A CA1187397A CA000398120A CA398120A CA1187397A CA 1187397 A CA1187397 A CA 1187397A CA 000398120 A CA000398120 A CA 000398120A CA 398120 A CA398120 A CA 398120A CA 1187397 A CA1187397 A CA 1187397A
- Authority
- CA
- Canada
- Prior art keywords
- pilot flame
- burner
- thermo
- gas
- ignition
- 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.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23Q—IGNITION; EXTINGUISHING-DEVICES
- F23Q9/00—Pilot flame igniters
- F23Q9/08—Pilot flame igniters with interlock with main fuel supply
- F23Q9/12—Pilot flame igniters with interlock with main fuel supply to permit the supply to the main burner in dependence upon existence of pilot flame
- F23Q9/14—Pilot flame igniters with interlock with main fuel supply to permit the supply to the main burner in dependence upon existence of pilot flame using electric means, e.g. by light-sensitive elements
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 B S T R A C T
A system for automatic ignition through an intermittently operating pilot flame burner of the main burner of a gas fired appliance, using a thermo-element as a signal emitter.
The invention provides a system for the automatic ignition of a gas fired appliance, having an intermittently operative pilot flame burner (4), comprising a thermo-element (11), which serves through an electro-nic unit (7) as means for producing a control signal for opening the main gas valve (3). Thereby the system has a small reaction time while a thermo-element is a simple, cheap and little or not failure sensitive part, which already is used in large numbers in other gas appliances.
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A system for automatic ignition through an intermittently operating pilot flame burner of the main burner of a gas fired appliance, using a thermo-element as a signal emitter.
The invention provides a system for the automatic ignition of a gas fired appliance, having an intermittently operative pilot flame burner (4), comprising a thermo-element (11), which serves through an electro-nic unit (7) as means for producing a control signal for opening the main gas valve (3). Thereby the system has a small reaction time while a thermo-element is a simple, cheap and little or not failure sensitive part, which already is used in large numbers in other gas appliances.
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Description
W 3697-3 ~ed.dB/LvD
3~
- t -~ system for automatic ignition through an in-termittently operating pilot E]ame burner ~ the main burner of a gas fired appliance, using a thermo-element as a signal emit-ter.
The invention relates to an au-tomatic ignition system for automatic ignition of the gas burner of a gas fired appliance through the intermediary of an intermittently operative pilot flame burner, having a pilot flame gas valve, an ignition signal for -the appliance actuating an ignition device and simultaneously open the pilot flame valve such that the ignition device ignits the pilot flame gas.
By causing intermitten-t burning of the pilot flame, namely only in the moment in which the main burner has to be ignited and therefore not cons~antly, as was usual, an energy and cost savings is permitted, which is important in connection with the fact that fuels are becoming scarcer and energy prices increase.
similar sys'cem is known from the U.S. patent ~,086.0~8. According to that patent, a circuit using diodes is used between a flame detection means at the pilot flame burner and the main gas valve, such -that the main gas valve only opens if the pilot flame burns.
The invention aims at providing a simi]ar au-tomatic ignition system, having an intermittently operative pilot flame burner, which is simpler and more reliable.
This is achieved according to the invention in tha-t ~djacent to the pilot flame burner a thermo-element or thermo-couple is provided, which is heated by -the ignited pi.lot flame and issues a vol-tage, which af-ter a predetermined small value has been reached is transduced through an electro-nic unit into a control signal for opening the main gas valve of the main burner.
Thereby already when the thermo-couple voltage has a very small value, e.g.
5 mV, through electronic circui-ts a value is reached, which is sufficient ~ ./2 3't~'i' as control signal :For the main valve. The reaction time of this sys-tem therefore is small.
Furthermore a thermo-element is a simple and li-ttle or not failure sensitive element, while it is used in large numbers in all kinds of gas fired appliances. Moreover, by the invention, gas fired appliances having a permanently burning pilot flame and a thermo-element may easily be re-arranged into intermittent operation, since therefore only an ignition device and an electronic unit have to be provided.
In accordance with the present invention, there is provided in an automatic ignition system for automatic ignition of the main burner of a gas fired appliance through the intermediary oE an inter-mittently operative pilot flame burnerl the system including a pilot flame gas valve, ignition signal means for the appliance actuating an ignition device and simultaneously opening the pilot flame gas valve so that the ignition device ignites the pilot flame gas, the improvement comprising: thermo-element means, disposed adjacent to said pilot flame burner, for generating a voltage in response to heat produced by the ignited pilot flame; and electronic con-trol means, coupling said thermo-element means with said main burner, for gener-ating in response to a predetermined value of said voltage a signal to control the opening of a gas valve in said main burner.
It is to be noted -that e.g. from the French Patent 2169451, according to which, however, no automatic ignition takes place, ap-plying an ionisation electrode and a thermo-element adjacent to the pilot flame burner of a gas fired appliance is known, the purpose being to ~horten the time interval after which the appliance is again safeguarded against the outflow of uni.gnited gas after an operative 3~3~
period of the burner. Such an ionisation electrode ensured a quick reaction as well for opening as for closing the gas valves, but the disadvantage is that ionisation measurement is very failure sensitive.
It is to be noted further that using a thyristor in the electronic unit of a gas Eired appliance is known from United States Patent ~,188,180.
A further system is known, in which the burner pilot flame hea-ts a small tube, containing a quantity of mercury. Said mercury expands and actuates a pressure switch -through the liquid pressure generated thereby, said switch opening the main gas valve. A disad-vantage of said known system is the long reaction time.
The invention will hereunder be explained with reference to the drawing in which an embodiment as example of the system accord-ing to the invention is shown schematically. The figure shows the diagram of the system.
- 2a -- 3 ~ 73~'7 In fig. 1 only a main burner 1 of the gas fired appliance has been shown.
Gas may be supplied thereto through a main gas conduit 2 in which a main gas valve 3 has been provided. The ignition device comprises a pilot flame burner 4 -the flame of which is directed towards outflow aper-tures of tne main gas burner 1.
Co~bustion gas for the pi:Lot flame burner 4 may be supplied thereto through a pilot flame gas conduit 5 in which a pilot flame gas valve 6 is provided, which together with the main gas valve 3 may be contained in a housing.
An electronic control device 7 includes as an example a spark generator, not further shown, connected through an electric conduit 8 to a pin 9 provided adjacent to the pilot flame burner 4.
The gas fires appliance is e.g. a central heating boiler, a gas heater, a~~hot water storage apparatus or a gas boiler.
With the central heating boiler, gas heater or hot water storage appara-tus, a thermostat signal provides the ignition signal for the burner.
With a gas boiler the ignition signal is issued each time the hot water tap thereof is opened. The ignition signal actuates the ignition device, such as e.g. a spark generator, whereby high voltage sparks are generated between the ignition pin 9 and the mass of -the burner ~.
Simultaneously, under the influence of the ignition signal of the electronic unit 7, through a conduit 10 a control signal is issued to the pilot flame gas valve 6, whereby this valve is opened. The gas flowing from the burner apertures of the pilot flame burner ~ is now ignited.
by the sparks emitted by the pin 9.
According to the invention adjacent to the burner ~, a therrno-element or thermo couple 11 has been provided, which is arranged such that it is exposed to the flames of the pilot burner and is hea-ted thereby. The potential generated thereby is guided as a siynal through an electric conduit 12 towards the electronic unit 7. The signal is, a:Eter a ./4 3t3~
predetermined value has been reached, e.g. 5 mV, transmitted through a condui-t 13 to the main gas valve 3, which is opened thereby.
Gas now flows through the conduit 2 towards the main burner 1, which after issuing from the burner apertures thereoE, is ignited by the pilot flame of the burner 4.
If the gas fired appliance issues a terminating signal for the burner, the electronic unit 7 causes the closure of the main gas valve 3, as well as of the pilo-t flame gas valve 6, so that no gas is used during the time that the main burner 1 is not required -to be burning.
The electronic unit 7, which is controlled by a programmed integrated circuit or chip, comprises electronic elements which are generally known per se so that no description thereof will be given here.
Said electronic unit 7 likewise contains all necessary safety devices as dictated by the International Inspection standards, among others e.g.
a maximum thermostat locking device.
3~
- t -~ system for automatic ignition through an in-termittently operating pilot E]ame burner ~ the main burner of a gas fired appliance, using a thermo-element as a signal emit-ter.
The invention relates to an au-tomatic ignition system for automatic ignition of the gas burner of a gas fired appliance through the intermediary of an intermittently operative pilot flame burner, having a pilot flame gas valve, an ignition signal for -the appliance actuating an ignition device and simultaneously open the pilot flame valve such that the ignition device ignits the pilot flame gas.
By causing intermitten-t burning of the pilot flame, namely only in the moment in which the main burner has to be ignited and therefore not cons~antly, as was usual, an energy and cost savings is permitted, which is important in connection with the fact that fuels are becoming scarcer and energy prices increase.
similar sys'cem is known from the U.S. patent ~,086.0~8. According to that patent, a circuit using diodes is used between a flame detection means at the pilot flame burner and the main gas valve, such -that the main gas valve only opens if the pilot flame burns.
The invention aims at providing a simi]ar au-tomatic ignition system, having an intermittently operative pilot flame burner, which is simpler and more reliable.
This is achieved according to the invention in tha-t ~djacent to the pilot flame burner a thermo-element or thermo-couple is provided, which is heated by -the ignited pi.lot flame and issues a vol-tage, which af-ter a predetermined small value has been reached is transduced through an electro-nic unit into a control signal for opening the main gas valve of the main burner.
Thereby already when the thermo-couple voltage has a very small value, e.g.
5 mV, through electronic circui-ts a value is reached, which is sufficient ~ ./2 3't~'i' as control signal :For the main valve. The reaction time of this sys-tem therefore is small.
Furthermore a thermo-element is a simple and li-ttle or not failure sensitive element, while it is used in large numbers in all kinds of gas fired appliances. Moreover, by the invention, gas fired appliances having a permanently burning pilot flame and a thermo-element may easily be re-arranged into intermittent operation, since therefore only an ignition device and an electronic unit have to be provided.
In accordance with the present invention, there is provided in an automatic ignition system for automatic ignition of the main burner of a gas fired appliance through the intermediary oE an inter-mittently operative pilot flame burnerl the system including a pilot flame gas valve, ignition signal means for the appliance actuating an ignition device and simultaneously opening the pilot flame gas valve so that the ignition device ignites the pilot flame gas, the improvement comprising: thermo-element means, disposed adjacent to said pilot flame burner, for generating a voltage in response to heat produced by the ignited pilot flame; and electronic con-trol means, coupling said thermo-element means with said main burner, for gener-ating in response to a predetermined value of said voltage a signal to control the opening of a gas valve in said main burner.
It is to be noted -that e.g. from the French Patent 2169451, according to which, however, no automatic ignition takes place, ap-plying an ionisation electrode and a thermo-element adjacent to the pilot flame burner of a gas fired appliance is known, the purpose being to ~horten the time interval after which the appliance is again safeguarded against the outflow of uni.gnited gas after an operative 3~3~
period of the burner. Such an ionisation electrode ensured a quick reaction as well for opening as for closing the gas valves, but the disadvantage is that ionisation measurement is very failure sensitive.
It is to be noted further that using a thyristor in the electronic unit of a gas Eired appliance is known from United States Patent ~,188,180.
A further system is known, in which the burner pilot flame hea-ts a small tube, containing a quantity of mercury. Said mercury expands and actuates a pressure switch -through the liquid pressure generated thereby, said switch opening the main gas valve. A disad-vantage of said known system is the long reaction time.
The invention will hereunder be explained with reference to the drawing in which an embodiment as example of the system accord-ing to the invention is shown schematically. The figure shows the diagram of the system.
- 2a -- 3 ~ 73~'7 In fig. 1 only a main burner 1 of the gas fired appliance has been shown.
Gas may be supplied thereto through a main gas conduit 2 in which a main gas valve 3 has been provided. The ignition device comprises a pilot flame burner 4 -the flame of which is directed towards outflow aper-tures of tne main gas burner 1.
Co~bustion gas for the pi:Lot flame burner 4 may be supplied thereto through a pilot flame gas conduit 5 in which a pilot flame gas valve 6 is provided, which together with the main gas valve 3 may be contained in a housing.
An electronic control device 7 includes as an example a spark generator, not further shown, connected through an electric conduit 8 to a pin 9 provided adjacent to the pilot flame burner 4.
The gas fires appliance is e.g. a central heating boiler, a gas heater, a~~hot water storage apparatus or a gas boiler.
With the central heating boiler, gas heater or hot water storage appara-tus, a thermostat signal provides the ignition signal for the burner.
With a gas boiler the ignition signal is issued each time the hot water tap thereof is opened. The ignition signal actuates the ignition device, such as e.g. a spark generator, whereby high voltage sparks are generated between the ignition pin 9 and the mass of -the burner ~.
Simultaneously, under the influence of the ignition signal of the electronic unit 7, through a conduit 10 a control signal is issued to the pilot flame gas valve 6, whereby this valve is opened. The gas flowing from the burner apertures of the pilot flame burner ~ is now ignited.
by the sparks emitted by the pin 9.
According to the invention adjacent to the burner ~, a therrno-element or thermo couple 11 has been provided, which is arranged such that it is exposed to the flames of the pilot burner and is hea-ted thereby. The potential generated thereby is guided as a siynal through an electric conduit 12 towards the electronic unit 7. The signal is, a:Eter a ./4 3t3~
predetermined value has been reached, e.g. 5 mV, transmitted through a condui-t 13 to the main gas valve 3, which is opened thereby.
Gas now flows through the conduit 2 towards the main burner 1, which after issuing from the burner apertures thereoE, is ignited by the pilot flame of the burner 4.
If the gas fired appliance issues a terminating signal for the burner, the electronic unit 7 causes the closure of the main gas valve 3, as well as of the pilo-t flame gas valve 6, so that no gas is used during the time that the main burner 1 is not required -to be burning.
The electronic unit 7, which is controlled by a programmed integrated circuit or chip, comprises electronic elements which are generally known per se so that no description thereof will be given here.
Said electronic unit 7 likewise contains all necessary safety devices as dictated by the International Inspection standards, among others e.g.
a maximum thermostat locking device.
Claims
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In an automatic ignition system for automatic ignition of the main burner of a gas fired appliance through the intermediary of an intermittently operative pilot flame burner, the system includ-ing a pilot flame gas valve, ignition signal means for the appliance actuating an ignition device and simultaneously opening the pilot flame gas valve so that the ignition device ignites the pilot flame gas, the improvement comprising:
thermo-element means, disposed adjacent to said pilot flame burner, for generating a voltage in response to heat produced by the ignited pilot flame; and electronic control means, coupling said thermo-element means with said main burner, for generating in response to a prede-termined value of said voltage a signal to control the opening of a gas valve in said main burner.
thermo-element means, disposed adjacent to said pilot flame burner, for generating a voltage in response to heat produced by the ignited pilot flame; and electronic control means, coupling said thermo-element means with said main burner, for generating in response to a prede-termined value of said voltage a signal to control the opening of a gas valve in said main burner.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL8101301A NL8101301A (en) | 1981-03-17 | 1981-03-17 | Apparatus for igniting the main burner of a gas-fired appliance by means of a pilot burner. |
| NL810131 | 1981-03-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1187397A true CA1187397A (en) | 1985-05-21 |
Family
ID=19837182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000398120A Expired CA1187397A (en) | 1981-03-17 | 1982-03-11 | System for automatic ignition, through an intermittently operating pilot flame burner of the main burner of a gas fired appliance, using a thermo- element as a signal emitter |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0060604A1 (en) |
| JP (1) | JPS58117925A (en) |
| CA (1) | CA1187397A (en) |
| NL (1) | NL8101301A (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2678092A (en) * | 1950-03-17 | 1954-05-11 | Gen Controls Co | Fuel burner safety control system |
| DE2317857A1 (en) * | 1973-04-10 | 1974-10-24 | Licentia Gmbh | FLAME CONTROL DEVICE FOR GAS-OPERATED ABSORBER REFRIGERATORS |
| US4188180A (en) * | 1977-12-02 | 1980-02-12 | Honeywell Inc. | Fuel burner safe starting system |
-
1981
- 1981-03-17 NL NL8101301A patent/NL8101301A/en not_active Application Discontinuation
-
1982
- 1982-03-11 CA CA000398120A patent/CA1187397A/en not_active Expired
- 1982-03-12 EP EP82200333A patent/EP0060604A1/en not_active Withdrawn
- 1982-03-17 JP JP4096382A patent/JPS58117925A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58117925A (en) | 1983-07-13 |
| NL8101301A (en) | 1982-10-18 |
| EP0060604A1 (en) | 1982-09-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |