CA2684542C - Draught-resistant fireplace pilot - Google Patents
Draught-resistant fireplace pilot Download PDFInfo
- Publication number
- CA2684542C CA2684542C CA2684542A CA2684542A CA2684542C CA 2684542 C CA2684542 C CA 2684542C CA 2684542 A CA2684542 A CA 2684542A CA 2684542 A CA2684542 A CA 2684542A CA 2684542 C CA2684542 C CA 2684542C
- Authority
- CA
- Canada
- Prior art keywords
- gas
- burner
- pilot
- pilot igniter
- igniter
- 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.)
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Links
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 4
- 238000004891 communication Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 5
- 238000002485 combustion reaction Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 57
- 235000021168 barbecue Nutrition 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 4
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
- F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
- F23D14/10—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with elongated tubular burner head
- F23D14/105—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with elongated tubular burner head with injector axis parallel to the burner head axis
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J37/00—Baking; Roasting; Grilling; Frying
- A47J37/06—Roasters; Grills; Sandwich grills
- A47J37/07—Roasting devices for outdoor use; Barbecues
- A47J37/0786—Accessories
- A47J37/079—Charcoal igniting devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/26—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid with provision for a retention flame
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing tubes
- F23D14/64—Mixing devices; Mixing tubes with injectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23Q—IGNITION; EXTINGUISHING-DEVICES
- F23Q9/00—Pilot flame igniters
- F23Q9/02—Pilot flame igniters without interlock with main fuel supply
- F23Q9/04—Pilot flame igniters without interlock with main fuel supply for upright burners, e.g. gas-cooker burners
- F23Q9/045—Structurally associated with a main-burner
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C3/00—Stoves or ranges for gaseous fuels
- F24C3/10—Arrangement or mounting of ignition devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
- F23D2900/00014—Pilot burners specially adapted for ignition of main burners in furnaces or gas turbines
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Pre-Mixing And Non-Premixing Gas Burner (AREA)
Abstract
A pilot ignition system for an outdoor gas appliance provides a pilot igniter that is isolated from the ambient wind around the burner by physically distancing the pilot igniter from the burners. The distance is overcome by providing a jet of gas to a nozzle slightly upstream of the pilot, the jet of gas being directed toward the burner. The jet of gas is ignited by the pilot resulting in a torch or jet of flame extending from the pilot igniter through the downstream length of an enclosure to the burner. The jet of flame bridges the distance between the pilot igniter and the burner, while the distance itself isolates the pilot light from wind in the vicinity of the burner.
Description
TITLE OF THE INVENTION
DRAUGHT-RESISTANT FIREPLACE PILOT
FIELD OF THE INVENTION
The present invention relates to outdoor gas appliances. More particularly this 1o invention relates to pilot igniter systems for outdoor gas appliances such as open fireplaces, barbecues or fire pits.
BACKGROUND OF THE INVENTION
Outdoor gas appliances such as open fireplaces and barbecues are notorious for the difficulties they present in maintaining an ignition pilot flame for the purpose of igniting the main burners. Since the appliances are outdoors and the primary burner and the adjacent pilot are exposed to the elements, they are subject to environmental conditions, particularly to gusts of wind that tend to extinguish the pilot.
The prior art has seen numerous attempts to overcome this difficulty by designing particular shapes of enclosures for the pilot with a view to isolating the pilot (within the enclosure) from the movement of air around the burners.
However as the pilot is adjacent the log set, sand pan, piping or flame distributing structures, the pilot enclosure must fit within a limited space and needs to conform to the location and shapes of the flame distributing elements that crowd it.
Despite the need to fit the pilot enclosure within a limited space and shape, the enclosure must still be large enough in volume to allow a sufficient supply of oxygen to initiate and maintain ignition. Most of such prior art attempts have been unsatisfactory, resulting in unsightly or ineffective enclosure structures that do not prevent blow outs of the pilot.
It is therefore an object of the present invention to provide a pilot ignition system for an outdoor appliance of the type having a burner that is exposed to ambient wind, but that provides improved reliability of the pilot in windy and other environmental conditions.
SUMMARY OF THE INVENTION
There is provided a pilot ignition system for an outdoor gas appliance wherein the pilot igniter is isolated from the atmospheric elements such as ambient wind by physically distancing it from the appliance burners. The distance between the pilot and the burner would normally prevent the pilot from igniting the primary burner. According to the preferred embodiment of the invention, this is overcome by providing a jet of gas to a nozzle slightly upstream of the pilot, the jet of gas being directed toward the burner end of the enclosure. The jet of gas is ignited by the pilot resulting in a torch or jet of flame extending from the pilot igniter through the downstream length of the enclosure and to the primary burner. The jet of flame bridges the distance between the pilot and the burner, while the distance itself isolates the pilot igniter from environmental effects in the vicinity of the burner.
According to one aspect of the invention, a pilot ignition system for an outdoor gas appliance comprises a pilot igniter that is isolated from the atmospheric elements by physically distancing it from the appliance burners, and a nozzle for
DRAUGHT-RESISTANT FIREPLACE PILOT
FIELD OF THE INVENTION
The present invention relates to outdoor gas appliances. More particularly this 1o invention relates to pilot igniter systems for outdoor gas appliances such as open fireplaces, barbecues or fire pits.
BACKGROUND OF THE INVENTION
Outdoor gas appliances such as open fireplaces and barbecues are notorious for the difficulties they present in maintaining an ignition pilot flame for the purpose of igniting the main burners. Since the appliances are outdoors and the primary burner and the adjacent pilot are exposed to the elements, they are subject to environmental conditions, particularly to gusts of wind that tend to extinguish the pilot.
The prior art has seen numerous attempts to overcome this difficulty by designing particular shapes of enclosures for the pilot with a view to isolating the pilot (within the enclosure) from the movement of air around the burners.
However as the pilot is adjacent the log set, sand pan, piping or flame distributing structures, the pilot enclosure must fit within a limited space and needs to conform to the location and shapes of the flame distributing elements that crowd it.
Despite the need to fit the pilot enclosure within a limited space and shape, the enclosure must still be large enough in volume to allow a sufficient supply of oxygen to initiate and maintain ignition. Most of such prior art attempts have been unsatisfactory, resulting in unsightly or ineffective enclosure structures that do not prevent blow outs of the pilot.
It is therefore an object of the present invention to provide a pilot ignition system for an outdoor appliance of the type having a burner that is exposed to ambient wind, but that provides improved reliability of the pilot in windy and other environmental conditions.
SUMMARY OF THE INVENTION
There is provided a pilot ignition system for an outdoor gas appliance wherein the pilot igniter is isolated from the atmospheric elements such as ambient wind by physically distancing it from the appliance burners. The distance between the pilot and the burner would normally prevent the pilot from igniting the primary burner. According to the preferred embodiment of the invention, this is overcome by providing a jet of gas to a nozzle slightly upstream of the pilot, the jet of gas being directed toward the burner end of the enclosure. The jet of gas is ignited by the pilot resulting in a torch or jet of flame extending from the pilot igniter through the downstream length of the enclosure and to the primary burner. The jet of flame bridges the distance between the pilot and the burner, while the distance itself isolates the pilot igniter from environmental effects in the vicinity of the burner.
According to one aspect of the invention, a pilot ignition system for an outdoor gas appliance comprises a pilot igniter that is isolated from the atmospheric elements by physically distancing it from the appliance burners, and a nozzle for
2 generating a stream of gas past the pilot igniter to create a torch or jet of flame that bridges the distance between the pilot igniter and the burners.
In a more particular aspect of the invention, the pilot igniter and the nozzle are recessed in an elongated enclosure that opens to the burners at a distal end in relation to the pilot igniter and nozzle, the enclosure containing and directing the resulting jet of flame to the burners.
Preferably the elongated enclosure extends into the appliance to an area that is 1o protected from the exterior environment. In this arrangement, the pilot igniter is sufficiently recessed into the enclosure that it is substantially unaffected by gusts of wind occurring in the immediate vicinity of the burners.
In another aspect, the invention comprises an ignition assembly for an outdoor gas appliance in which a gas burner is substantially exposed to ambient wind, comprising an elongated enclosure one end of which has an opening that is adjacent the burner. A pilot igniter is at least partially located within the enclosure at a position that is distal from the opening whereby to substantially isolate the pilot igniter from the ambient wind. The assembly further comprises a nozzle for supplying a jet of gas along and through the elongated enclosure past the pilot igniter and toward the burner, the nozzle being located upstream of the pilot igniter, whereby when the jet of gas is ignited, there results a jet of flame extending the downstream length of the enclosure to the opening and the burner.
In another aspect, the invention comprises an ignition assembly for an outdoor gas appliance in which a gas burner is exposed to ambient wind, comprising a pilot igniter that is located a distance away from the burner that effectively isolates the pilot igniter from the wind, and a nozzle for generating a stream of
In a more particular aspect of the invention, the pilot igniter and the nozzle are recessed in an elongated enclosure that opens to the burners at a distal end in relation to the pilot igniter and nozzle, the enclosure containing and directing the resulting jet of flame to the burners.
Preferably the elongated enclosure extends into the appliance to an area that is 1o protected from the exterior environment. In this arrangement, the pilot igniter is sufficiently recessed into the enclosure that it is substantially unaffected by gusts of wind occurring in the immediate vicinity of the burners.
In another aspect, the invention comprises an ignition assembly for an outdoor gas appliance in which a gas burner is substantially exposed to ambient wind, comprising an elongated enclosure one end of which has an opening that is adjacent the burner. A pilot igniter is at least partially located within the enclosure at a position that is distal from the opening whereby to substantially isolate the pilot igniter from the ambient wind. The assembly further comprises a nozzle for supplying a jet of gas along and through the elongated enclosure past the pilot igniter and toward the burner, the nozzle being located upstream of the pilot igniter, whereby when the jet of gas is ignited, there results a jet of flame extending the downstream length of the enclosure to the opening and the burner.
In another aspect, the invention comprises an ignition assembly for an outdoor gas appliance in which a gas burner is exposed to ambient wind, comprising a pilot igniter that is located a distance away from the burner that effectively isolates the pilot igniter from the wind, and a nozzle for generating a stream of
3 gas past the pilot igniter whereby to create a jet of flame that bridges the distance between the pilot igniter and the burner.
In a more particular aspect, the pilot igniter and nozzle are located in an elongated enclosure a distal end of which has an opening adjacent the burner, the enclosure acting to contain and direct the jet of flame from the pilot igniter to the burner.
In a further particular aspect, the assembly further comprises a first conduit for 1o supplying gas to the pilot igniter and a second conduit distinct from the first conduit for supplying gas to the nozzle. The assembly may further comprise a sensor for detecting when the pilot igniter has been lit and a controlled valve for enabling gas supply to the nozzle upon detecting that the pilot igniter has been lit.
In yet a further particular aspect, the elongated enclosure is housed within a second enclosure having at least one aperture providing air communication with a source of combustion air and the interior of which in air communication with the interior of the second enclosure.
In yet another aspect, the air communication with the interior of the second enclosure is provided by an aperture in the side of the elongated enclosure and the pilot igniter extends through the aperture. The assembly may further comprise a venturi element interposed between the nozzle and the pilot igniter.
In another aspect, the invention comprises an outdoor gas burning appliance comprising a support structure for supporting at least a gas burner and any of the assemblies described above contained within said support structure. According to a more particular aspect, the support structure may define a substantially 3o enclosed air cavity and the assembly is in air communication with the air cavity.
In another aspect, the invention comprises a method of igniting the burner of an outdoor gas appliance in which the burner is exposed to ambient wind, comprising locating a pilot igniter a distance away from the burner that effectively isolates the pilot igniter from the wind and generating a pressurized stream of gas past the pilot igniter and creating a jet of flame that bridges the distance between the pilot igniter and the burner. In a more particular aspect of the method, there may be provided a first gas supply to the pilot igniter and a second gas supply for generating the pressurized stream of gas, and wherein the step of 1o generating is undertaken upon a sensor detecting successful lighting of the pilot igniter.
The foregoing was intended as a broad summary only and of only some of the aspects of the invention. Other aspects of the invention will be more fully appreciated by reference to the detailed description of the preferred embodiment.
Moreover, despite this disclosure, the actual invention, inventive apparatus, methods, concepts and inventive ideas for which the monopoly afforded by this patent is sought are ultimately defined by the formal claims of this application, not by the details of the summary or of the preferred embodiment.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described by reference to the detailed description of the preferred embodiment and to the drawings thereof in which:
Fig. 1 is a vertical sectional view of an outdoor gas barbecue according to the currently contemplated preferred embodiment of the invention;
Fig. 2 is a side elevation of the igniter assembly and main burners embodied in Fig. 1;
Fig. 3 is vertical sectional view of the igniter assembly and main burners of Fig. 2; and, Fig. 4 is a perspective view of the igniter assembly of Fig. 1 with the main burners being exploded to show the torch tube and main burner gas supply outlets.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The preferred embodiment of the invention is embodied in an outdoor gas barbecue 10, illustrated in Fig. 1. A set of gas burners 18 is mounted in a central pit 14 defined in a support structure 12. A barbecue grill 16 overlies the pit 14. It will be appreciated that the burners 18 are exposed to the ambient wind.
Support structure 12 extends around the pit 14 and defines an air cavity 15 beneath the pit 14. A suitably dampened air inlet 17 is provided in the support structure 12 to allow outside air to communicate with the air cavity 15 and to thereby provide combustion air to the igniter assembly 22.
Gas inlet conduit 20 supplies gas to the igniter assembly 22 and the burners 18.
As will be described below, control valve 26 regulates the supply of gas to the burners 18, a pilot igniter 34 (see Fig. 3) and a gas jet supply nozzle 44 (Fig.3).
The igniter assembly 22 will now be described by reference to Figs. 2, 3 and
In a more particular aspect, the pilot igniter and nozzle are located in an elongated enclosure a distal end of which has an opening adjacent the burner, the enclosure acting to contain and direct the jet of flame from the pilot igniter to the burner.
In a further particular aspect, the assembly further comprises a first conduit for 1o supplying gas to the pilot igniter and a second conduit distinct from the first conduit for supplying gas to the nozzle. The assembly may further comprise a sensor for detecting when the pilot igniter has been lit and a controlled valve for enabling gas supply to the nozzle upon detecting that the pilot igniter has been lit.
In yet a further particular aspect, the elongated enclosure is housed within a second enclosure having at least one aperture providing air communication with a source of combustion air and the interior of which in air communication with the interior of the second enclosure.
In yet another aspect, the air communication with the interior of the second enclosure is provided by an aperture in the side of the elongated enclosure and the pilot igniter extends through the aperture. The assembly may further comprise a venturi element interposed between the nozzle and the pilot igniter.
In another aspect, the invention comprises an outdoor gas burning appliance comprising a support structure for supporting at least a gas burner and any of the assemblies described above contained within said support structure. According to a more particular aspect, the support structure may define a substantially 3o enclosed air cavity and the assembly is in air communication with the air cavity.
In another aspect, the invention comprises a method of igniting the burner of an outdoor gas appliance in which the burner is exposed to ambient wind, comprising locating a pilot igniter a distance away from the burner that effectively isolates the pilot igniter from the wind and generating a pressurized stream of gas past the pilot igniter and creating a jet of flame that bridges the distance between the pilot igniter and the burner. In a more particular aspect of the method, there may be provided a first gas supply to the pilot igniter and a second gas supply for generating the pressurized stream of gas, and wherein the step of 1o generating is undertaken upon a sensor detecting successful lighting of the pilot igniter.
The foregoing was intended as a broad summary only and of only some of the aspects of the invention. Other aspects of the invention will be more fully appreciated by reference to the detailed description of the preferred embodiment.
Moreover, despite this disclosure, the actual invention, inventive apparatus, methods, concepts and inventive ideas for which the monopoly afforded by this patent is sought are ultimately defined by the formal claims of this application, not by the details of the summary or of the preferred embodiment.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described by reference to the detailed description of the preferred embodiment and to the drawings thereof in which:
Fig. 1 is a vertical sectional view of an outdoor gas barbecue according to the currently contemplated preferred embodiment of the invention;
Fig. 2 is a side elevation of the igniter assembly and main burners embodied in Fig. 1;
Fig. 3 is vertical sectional view of the igniter assembly and main burners of Fig. 2; and, Fig. 4 is a perspective view of the igniter assembly of Fig. 1 with the main burners being exploded to show the torch tube and main burner gas supply outlets.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The preferred embodiment of the invention is embodied in an outdoor gas barbecue 10, illustrated in Fig. 1. A set of gas burners 18 is mounted in a central pit 14 defined in a support structure 12. A barbecue grill 16 overlies the pit 14. It will be appreciated that the burners 18 are exposed to the ambient wind.
Support structure 12 extends around the pit 14 and defines an air cavity 15 beneath the pit 14. A suitably dampened air inlet 17 is provided in the support structure 12 to allow outside air to communicate with the air cavity 15 and to thereby provide combustion air to the igniter assembly 22.
Gas inlet conduit 20 supplies gas to the igniter assembly 22 and the burners 18.
As will be described below, control valve 26 regulates the supply of gas to the burners 18, a pilot igniter 34 (see Fig. 3) and a gas jet supply nozzle 44 (Fig.3).
The igniter assembly 22 will now be described by reference to Figs. 2, 3 and
4.
Igniter assembly 22 generally comprises a cylindrical enclosure 24, an elongated torch tube 32, gas jet supply line 42, gas jet supply nozzle 44, venturi sleeve 46, igniter gas supply line 38, pilot igniter 34 and automatic gas valve 26.
Cylindrical enclosure 24 houses torch tube 32 as well as pilot igniter 34 that extends partially into torch tube 32 through an aperture 36. Enclosure 24 protects and contains the flame elements (torch tube 32 and igniter 34) while also providing controlled damping of turbulence for combustion air. Enclosure includes air inlets 28 providing air communication with air cavity 15 and the bottom of cylinder 24 is also open. Aperture 36 provides air communication to between the interior of torch tube 32 and the interior of enclosure 24.
Torch tube 32 is elongated and extends from the bottom of enclosure 24 to the top of enclosure 24, with an outlet opening 33 adjacent the burners 18. The bottom of torch tube 32 is sealed around gas jet supply nozzle 44. Gas jet supply nozzle 44 provides a stream of pressurized gas directed upward along the length of torch tube 32. A venturi sleeve 46 is welded to the inside wall of torch tube 32 and is positioned such that the stream of pressurized gas from the gas jet supply nozzle 44 is directed through the sleeve 46. Pilot igniter 34 is located slightly downstream the venturi sleeve 46.
The pressure supplied through gas jet supply line 42, the dimensions of gas jet supply nozzle 44 and the size of venturi sleeve 46 are chosen such that the resulting stream of pressurized gas will, when ignited by pilot igniter 34, create a torch or jet of flame 29 extending the length of torch tube 32 to the burners 18.
Pilot igniter 34 is supplied by igniter gas supply line 38 and gas is supplied to gas jet supply nozzle 44 through gas jet supply line 42. In operation, automatic valve 26 initiates ignition by first opening igniter gas supply line 38 and triggering ignition of the igniter 34. Once ignition is detected by means of a sensor (not
Igniter assembly 22 generally comprises a cylindrical enclosure 24, an elongated torch tube 32, gas jet supply line 42, gas jet supply nozzle 44, venturi sleeve 46, igniter gas supply line 38, pilot igniter 34 and automatic gas valve 26.
Cylindrical enclosure 24 houses torch tube 32 as well as pilot igniter 34 that extends partially into torch tube 32 through an aperture 36. Enclosure 24 protects and contains the flame elements (torch tube 32 and igniter 34) while also providing controlled damping of turbulence for combustion air. Enclosure includes air inlets 28 providing air communication with air cavity 15 and the bottom of cylinder 24 is also open. Aperture 36 provides air communication to between the interior of torch tube 32 and the interior of enclosure 24.
Torch tube 32 is elongated and extends from the bottom of enclosure 24 to the top of enclosure 24, with an outlet opening 33 adjacent the burners 18. The bottom of torch tube 32 is sealed around gas jet supply nozzle 44. Gas jet supply nozzle 44 provides a stream of pressurized gas directed upward along the length of torch tube 32. A venturi sleeve 46 is welded to the inside wall of torch tube 32 and is positioned such that the stream of pressurized gas from the gas jet supply nozzle 44 is directed through the sleeve 46. Pilot igniter 34 is located slightly downstream the venturi sleeve 46.
The pressure supplied through gas jet supply line 42, the dimensions of gas jet supply nozzle 44 and the size of venturi sleeve 46 are chosen such that the resulting stream of pressurized gas will, when ignited by pilot igniter 34, create a torch or jet of flame 29 extending the length of torch tube 32 to the burners 18.
Pilot igniter 34 is supplied by igniter gas supply line 38 and gas is supplied to gas jet supply nozzle 44 through gas jet supply line 42. In operation, automatic valve 26 initiates ignition by first opening igniter gas supply line 38 and triggering ignition of the igniter 34. Once ignition is detected by means of a sensor (not
5 shown), gas jet supply line 42 and burner gas supply line 40 are opened. A jet of flame 29 is generated within torch tube 32 and ignites the burners 18 that are being supplied from burner supply tube 31. As best appreciated by reference to Fig. 4, burner supply tube 31 is located outside torch tube 32 within enclosure 24.
Alternatively burner supply tube 31 may also be located outside of enclosure to minimize its proximity to the flame 29.
Once the burners are operational, the automatic gas valve 26 shuts off the gas supply to the pilot igniter 34 and to the gas jet supply nozzle 44.
Due to the remoteness of the pilot igniter 34 from the burners 18 and the outside environment that surrounds them, the invention provides an effective means of avoiding pilot blowout in windy and other environmental conditions, while nonetheless providing an effective ignition system for the main burners.
In alternative embodiments, the entire igniter assembly 22 may be provided without necessarily housing it within a larger air cavity in the gas appliance. The dimensions of the protective enclosure 24 and the air inlets 28, as well as the extent to which the bottom of the enclosure 24 is open may be chosen to substantially provide protection and to control air turbulence at the pilot igniter thereby allowing the igniter assembly to be housed in the open air rather than in a dedicated air cavity beneath the appliance.
Other structural arrangements can be contemplated that provide substantial isolation of the pilot igniter from the elements by physically distancing it from the burners, and the generation of a torch to bridge the distance between them.
It will therefore be appreciated by those skilled in the art that the preferred and alternative embodiments have been described in some detail but that various
Alternatively burner supply tube 31 may also be located outside of enclosure to minimize its proximity to the flame 29.
Once the burners are operational, the automatic gas valve 26 shuts off the gas supply to the pilot igniter 34 and to the gas jet supply nozzle 44.
Due to the remoteness of the pilot igniter 34 from the burners 18 and the outside environment that surrounds them, the invention provides an effective means of avoiding pilot blowout in windy and other environmental conditions, while nonetheless providing an effective ignition system for the main burners.
In alternative embodiments, the entire igniter assembly 22 may be provided without necessarily housing it within a larger air cavity in the gas appliance. The dimensions of the protective enclosure 24 and the air inlets 28, as well as the extent to which the bottom of the enclosure 24 is open may be chosen to substantially provide protection and to control air turbulence at the pilot igniter thereby allowing the igniter assembly to be housed in the open air rather than in a dedicated air cavity beneath the appliance.
Other structural arrangements can be contemplated that provide substantial isolation of the pilot igniter from the elements by physically distancing it from the burners, and the generation of a torch to bridge the distance between them.
It will therefore be appreciated by those skilled in the art that the preferred and alternative embodiments have been described in some detail but that various
6 modifications may be practiced without departing from the principles of the invention.
7
Claims (12)
1. An ignition assembly for an outdoor gas appliance in which a gas burner is substantially exposed to ambient wind, comprising:
an elongated enclosure one end of which has an opening that is adjacent said burner;
a pilot igniter at least partially located within said enclosure at a position that is distal from said opening whereby to substantially isolate said pilot igniter from said ambient wind;
a nozzle for supplying a jet of gas along and through said elongated enclosure past said pilot igniter and toward said burner, said nozzle being located upstream of said pilot igniter;
whereby when said jet of gas is ignited, there results a jet of flame extending the downstream length of said enclosure to said opening and said burner.
an elongated enclosure one end of which has an opening that is adjacent said burner;
a pilot igniter at least partially located within said enclosure at a position that is distal from said opening whereby to substantially isolate said pilot igniter from said ambient wind;
a nozzle for supplying a jet of gas along and through said elongated enclosure past said pilot igniter and toward said burner, said nozzle being located upstream of said pilot igniter;
whereby when said jet of gas is ignited, there results a jet of flame extending the downstream length of said enclosure to said opening and said burner.
2. An ignition assembly for an outdoor gas appliance in which a gas burner is exposed to ambient wind, comprising:
a pilot igniter that is located a distance away from said burner that effectively isolates said pilot igniter from said wind, and a nozzle for generating a stream of gas past the pilot igniter whereby to create a jet of flame that bridges the distance between said pilot igniter and said burner.
a pilot igniter that is located a distance away from said burner that effectively isolates said pilot igniter from said wind, and a nozzle for generating a stream of gas past the pilot igniter whereby to create a jet of flame that bridges the distance between said pilot igniter and said burner.
3. The assembly of claim 2 wherein said pilot igniter and said nozzle are located in an elongated enclosure a distal end of which has an opening adjacent said burner, said enclosure acting to contain and direct said jet of flame from said pilot igniter to said burner.
4. The assembly of claim 3 further comprising a first conduit for supplying gas to said pilot igniter and a second conduit distinct from said first conduit for supplying gas to said nozzle.
5. The assembly of claim 4 further comprising a sensor for detecting when said pilot igniter has been lit and a controlled valve for enabling gas supply to said nozzle upon detecting that said pilot igniter has been lit.
6. The assembly of claim 5 wherein:
said elongated enclosure is housed within a second enclosure;
said second enclosure has at least one aperture providing air communication with a source of combustion air; and, the interior of said elongated enclosure is in air communication with the interior of said second enclosure.
said elongated enclosure is housed within a second enclosure;
said second enclosure has at least one aperture providing air communication with a source of combustion air; and, the interior of said elongated enclosure is in air communication with the interior of said second enclosure.
7. The assembly of claim 6 wherein air communication with the interior of said second enclosure is provided by an aperture in the side of said elongated enclosure and said pilot igniter extends through said aperture.
8. The assembly of claim 4 further comprising a venturi element interposed between said nozzle and said pilot igniter.
9. An outdoor gas burning appliance comprising:
a support structure for supporting at least a gas burner; and, the assembly of claim 6 contained within said support structure.
a support structure for supporting at least a gas burner; and, the assembly of claim 6 contained within said support structure.
10. The appliance of claim 9 wherein said support structure defines a substantially enclosed air cavity and said assembly of claim 6 is in air communication with said air cavity.
11. A method of igniting the burner of an outdoor gas appliance in which said burner is exposed to ambient wind, comprising:
locating a pilot igniter a distance away from said burner that effectively isolates said pilot igniter from said wind, and generating a pressurized stream of gas past the pilot igniter and creating a jet of flame that bridges the distance between said pilot igniter and said burner.
locating a pilot igniter a distance away from said burner that effectively isolates said pilot igniter from said wind, and generating a pressurized stream of gas past the pilot igniter and creating a jet of flame that bridges the distance between said pilot igniter and said burner.
12. The method of claim 12 further comprising a first gas supply to said pilot igniter and a second gas supply for generating said pressurized stream of gas, and wherein said step of generating is undertaken upon a sensor detecting successful lighting of said pilot igniter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2684542A CA2684542C (en) | 2009-11-05 | 2009-11-05 | Draught-resistant fireplace pilot |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2684542A CA2684542C (en) | 2009-11-05 | 2009-11-05 | Draught-resistant fireplace pilot |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2684542A1 CA2684542A1 (en) | 2011-05-05 |
| CA2684542C true CA2684542C (en) | 2012-09-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2684542A Active CA2684542C (en) | 2009-11-05 | 2009-11-05 | Draught-resistant fireplace pilot |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2684542C (en) |
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2009
- 2009-11-05 CA CA2684542A patent/CA2684542C/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CA2684542A1 (en) | 2011-05-05 |
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