US20060199124A1 - Low NOx pilot burner and associated method of use - Google Patents
Low NOx pilot burner and associated method of use Download PDFInfo
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- US20060199124A1 US20060199124A1 US11/351,404 US35140406A US2006199124A1 US 20060199124 A1 US20060199124 A1 US 20060199124A1 US 35140406 A US35140406 A US 35140406A US 2006199124 A1 US2006199124 A1 US 2006199124A1
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- United States
- Prior art keywords
- pilot burner
- burner
- assembly
- providing
- hood
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Classifications
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- 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
- F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
- F23D14/725—Protection against flame failure by using flame detection devices
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- 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
- F23D14/84—Flame spreading or otherwise shaping
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- 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
- F23N5/10—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples
- F23N5/107—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples using mechanical means, e.g. safety valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
- F23N5/245—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electrical or electromechanical means
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- 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
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- 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
- F23D2900/00015—Pilot burners specially adapted for low load or transient conditions, e.g. for increasing stability
Definitions
- All gas burners are susceptible to lint, dust or oil (LDO) accumulation in harsh environments. These gas burners must shut down before exceeding carbon monoxide (CO) limits. When there is an accumulation of lint, dust or oil, this can cause the gas burner flame to flatten out and increase the internal temperature of the gas appliance's combustion chamber. Therefore, it is desired to have a pilot burner that will shut down when there is an excessive amount of lint, dust or oil.
- An illustrative, but nonlimiting example, of a gas appliance that utilizes a gas burner is a water heater.
- the present invention is directed to overcoming one or more of the problems set forth above.
- An aspect of the present invention is a pilot burner assembly.
- the pilot burner assembly includes a pilot burner having a top portion, middle portion and a bottom portion, wherein the top portion of the pilot burner includes a hood that is positioned adjacent to an igniter and a thermocouple.
- a middle portion of the pilot burner includes at least one opening providing an air inlet.
- the bracket assembly may be operatively attached to a pilot burner, a thermocouple assembly and an igniter assembly.
- a pilot burner is mounted at an angle with the thermocouple located lower than the pilot burner hood, e.g., 60°+/ ⁇ 15° in relationship to the bracket assembly.
- the bracket assembly may include a vertical portion with attachment holes as well as a u-shaped bracket with an upper opening and a lower opening for receiving a thermocouple.
- the bracket assembly may include a first top plate and a second top plate connected together.
- Still another aspect of the present invention may optionally include a hood.
- the hood may have at least one opening and preferably includes more than one opening to form a multiple-way hood, e.g., two-way hood.
- the at least one opening can include a wide variety of geometric shapes and sizes but is preferably triangular with an opening that can provide flame direction and pattern as well as a spark path between an igniter and a pilot burner.
- the insert may include an upper portion, a middle portion and a lower portion.
- the middle portion can include a flange can be positioned on top of a bracket assembly and the lower portion can be threaded.
- the presence of lint, dust and/or oil will restrict at least one opening, e.g., four (4), created by a hole(s) or slot(s) forming at least one primary air intake orifice.
- a primary air intake orifice is located in the middle portion of the insert that extends from an inner chamber of the insert to an outer surface of the middle portion of the insert.
- the orifice spud controls the primary flow of gas in the pilot burner and restricts the flow of gas.
- the orifice spud may include a first sidewall, a second sidewall and a nozzle.
- the nozzle may include an opening.
- the opening may include a first slot and a second slot that are positioned transverse, e.g., perpendicular, to each other and in fluid communication.
- Another aspect of the present invention may optionally include a ball sleeve.
- the ball sleeve may provide a compression seal between an orifice spud and a compression nut.
- the ball sleeve may include a triangular portion.
- Still another aspect of the present invention may optionally include a compression nut.
- the compression nut may provide connection to a gas valve and operate to compress a ball sleeve.
- the compression nut may be threadedly attached to a threaded end portion for an insert.
- the igniter may include a protruding electrode that can be bent to extend adjacent to an opening in a hood.
- An illustrative, but nonlimiting insulator can include ceramic material.
- the electrode is preferably at least partially covered in an insulating material.
- the insulator may be secured in the bracket assembly with an upper ring and a combination electrode holder and retainer.
- Yet another aspect of the present invention is a method of utilizing a pilot burner assembly.
- the method includes positioning a pilot burner, having a top portion, a middle portion and a bottom portion, near a thermocouple and an igniter so that when at least one opening providing an air inlet in the middle portion of the pilot burner is at least partially blocked with lint, oil or dust, then the flame to heat the thermocouple will shrink or lift to the point where it no longer can heat the thermocouple sufficiently to generate enough power to allow for a safety magnet valve to remain energized and will shut-off the associated gas-fired device.
- FIG. 1 is a perspective view of the pilot burner of the present invention mounted to a main burner;
- FIG. 2 is an isolated perspective view of an igniter assembly, a thermocouple assembly and a pilot burner in accordance with the present invention
- FIG. 3 is an exploded, perspective view of the pilot burner in accordance with the present invention and as shown in FIG. 2 ;
- FIG. 4 is a top view of an insert associated with the pilot burner shown in FIG. 3 ;
- FIG. 5 is a cross-sectional view of the insert associated with the pilot burner valve taken along Line 4 - 4 of FIG. 4 ;
- FIG. 6 is a cross-sectional view of the insert associated with the pilot burner valve taken along Line 5 - 5 of FIG. 5 ;
- FIG. 7 is an isolated view of the igniter assembly in accordance with the present invention and as shown in FIG. 2 ;
- FIG. 8 is a side, cross-sectional view of an orifice spud in accordance with the present invention and as shown in FIG. 3 ;
- FIG. 9 is a top view of an orifice spud in accordance with the present invention and as shown in FIG. 8 ;
- FIG. 10 is a magnified top view of the orifice spud in accordance with the present invention and as shown in FIG. 9 ;
- FIG. 11 is a top view of a ball sleeve in accordance with the present invention and as shown in FIG. 3 ;
- FIG. 12 is a cross-sectional view of the ball sleeve associated with the present invention taken along Line 11 - 11 of FIG. 11 ;
- FIG. 13 is a top view of a compression nut in accordance with the present invention and as shown in FIG. 3 .
- valve of the present invention is especially suited for controlling the flow of a combustible gas to a gas-fired appliance such as a furnace, a water heater or a gas-burning fireplace.
- a pilot burner is generally indicated by numeral 10 .
- the pilot burner 10 will be mounted adjacent to a thermocouple 20 .
- the pilot burner 10 is mounted at an angle with the thermocouple 20 located lower than the pilot burner hood 12 , e.g., 60° +/ ⁇ 15°.
- a hood 12 will provide flame to heat the thermocouple 20 and ignite a main burner 2 .
- the thermocouple 20 will allow the safety magnet valve (not shown) to remain energized so that gas can flow into a main burner 2 .
- thermocouple 20 is essentially a sensor that is utilized in a gas-fired device for detecting heat from the pilot burner 10 .
- igniter 22 for providing a spark to ignite the pilot burner 10 that is located adjacent to the hood 12 of the pilot burner 10 .
- an igniter 22 and an associated insulator 24 are attached to a bracket assembly 100 that includes a vertical portion 102 with attachment holes 105 .
- the bracket assembly 100 may include a u-shaped bracket 108 with an upper opening 103 and a lower opening 104 for receiving the thermocouple 20 , as shown in FIG. 1 .
- This can include a first top plate and a second top plate that are connected together. Any mechanical or chemical connection mechanism will suffice such as a rivet 199 .
- the assembly 100 may be unitary.
- the bracket assembly 100 is preferably, but not necessarily, designed to withstand at least fifty (50) pounds of push-out force and one hundred and twenty (120) foot-pounds of rotation torque.
- pilot burner 10 that includes the hood 12 that is mounted on top of the bracket assembly 100 with extending flange members 101 , e.g., four (4).
- holes or slots 112 are not limited to being positioned just above the bracket 100 and can be located along the length of the pilot burner 10 both above and below the bracket 100 .
- FIG. 3 is an exploded version of the pilot burner 10 shown in FIG. 2 , which includes the hood 12 having a first triangular opening 8 and a second triangular opening 9 to create the two-way opening.
- the hood 12 can include a wide variety of geometric shapes, sizes and number of openings.
- there is a plurality of extending flange members 101 extending outward from the bottom of the hood 12 e.g., four (4).
- the hood 12 provides flame direction and pattern as well as a spark path between the igniter 22 and the pilot burner 10 .
- the hood 12 is preferably located adjacent to the igniter 22 , as shown in FIG. 1 .
- This insert 202 may include an upper portion 201 , a middle portion 207 and a lower portion 206 .
- the middle portion 207 may include a flange portion 204 and the lower portion 207 may be threaded.
- the flange portion 204 is optionally positioned on top of the bracket assembly 100 . The presence of lint, dust and/or oil will restrict the at least one opening created by at least one hole or slot 113 forming the at least one primary air intake orifice located in the middle portion 207 .
- thermocouple 20 This will change the flame characteristics, including the lifting of the flame, to reduce the temperature of the thermocouple 20 .
- a safety magnet valve (not shown) will close to stop gas flow to the main burner 2 .
- This insert 202 restricts and controls the gas flow in the pilot burner 10 that provides a small flame to light the main burner 2 .
- FIG. 4 there is a cross-sectional top view of the insert 202 .
- the upper portion 201 and an optional flange portion 204 are shown.
- the cross section of the insert 202 includes the upper portion 201 , the optional flange portion 204 and the end portion 206 .
- the presence of lint, dust and/or oil will restrict the openings created by the holes or slots 113 so that air is restricted from flowing from the holes or slots 113 to the inner chamber 260 .
- the cross-section defined by Line 5 - 5 shows the holes or slots 113 , i.e., primary air intake orifices, which extend to the outer surface 262 of the insert 202 to the inner chamber 260 .
- the size of the at least one hole or slot 113 functioning as primary air intake orifice(s) can vary depending on the size and dimensions of the pilot burner 10 and the associated gas-fired device.
- the orifice spud 220 Positioned within the burner 10 is an orifice spud 220 , as shown in FIG. 3 .
- the orifice spud 220 controls the primary flow of gas in the pilot burner 10 and restricts the flow of gas.
- the orifice spud includes a first sidewall 242 , a second sidewall 244 and a nozzle 246 .
- the nozzle 246 includes an opening 248 .
- An illustrative, but nonlimiting, example of an opening 248 includes a first slot 250 and a second slot 252 that are positioned transverse, e.g., perpendicular, to each other and there is fluid communication between the first slot 250 and a second slot 252 , as shown in FIG. 10 .
- the ball sleeve 222 to provide a compression seal between the orifice spud 220 and a compression nut 224 , as shown in FIGS. 3, 11 and 12 .
- the ball sleeve may optionally include a triangular portion 261 .
- a compression nut 224 to retain the orifice spud 220 and ball sleeve 222 .
- the compression nut 224 provides connection to a gas valve and can compress the ball sleeve 222 .
- the compression nut 224 is operatively attached to the end portion 206 for the insert 202 , as shown in FIG. 2 .
- this connection is through interconnecting threads on both the compression nut 224 and the end portion 206 of the insert 202 .
- the igniter assembly is generally indicated by numeral 300 .
- This includes a protruding electrode 22 that can be bent to extend to an opening in the hood 12 , as shown in FIG. 1 .
- An illustrative, but nonlimiting insulator 24 can include ceramic material.
- the electrode 22 is then covered in insulating material, e.g., TEFLON®.
- TEFLON® is a federally registered trademark of E. I. du Pont de Nemours and Company, having a place of business at 1007 Market Street, Wilmington, Del. 19898.
- the insulator 24 can be secured in the bracket assembly 100 with an upper ring 310 , and a combination electrode holder and retainer 306 . There may be a connector to attach a bracket assembly that can support the thermocouple 20 , as shown in FIG. 1 .
- a method of utilizing a pilot burner 10 is also contemplated with an embodiment of the invention.
- the method includes positioning a pilot burner 10 near a thermocouple 20 and an igniter 22 so that when at least one primary air intake orifice 112 to the pilot burner 10 is at least partially blocked with lint, oil or dust, then the flame to heat the thermocouple 20 will shrink or lift to the point where the pilot burner can no longer can heat the thermocouple 20 sufficiently to generate enough power to allow for a safety magnet valve (not shown) to remain energized and will shut the associated gas-fired device such as the main gas burner 2 .
Abstract
Description
- This application is related to and claims priority from U.S. provisional patent application Ser. No. 60/593,776 filed Feb. 11, 2005, having inventor Frederick D. Lyles, entitled “Low NOx Pilot Burner And Associated Method Of Use.”
- All gas burners are susceptible to lint, dust or oil (LDO) accumulation in harsh environments. These gas burners must shut down before exceeding carbon monoxide (CO) limits. When there is an accumulation of lint, dust or oil, this can cause the gas burner flame to flatten out and increase the internal temperature of the gas appliance's combustion chamber. Therefore, it is desired to have a pilot burner that will shut down when there is an excessive amount of lint, dust or oil. An illustrative, but nonlimiting example, of a gas appliance that utilizes a gas burner is a water heater. Moreover, it is desirable to have a low NOx pilot burner. This is due to the fact that NOx is the generic term for a group of highly reactive gases, all of which contain nitrogen and oxygen in varying amounts.
- There are now standards that dictate that a water heater must not produce flue gases that contain carbon monoxide in excess of 0.04 (%) percent on an air free basis when exposed to lint, dust or oil. These test standards are listed under ANSI Z21.10.1b-2004, CSA 4.1b-2004, Section 2.36 as “Resistance to Lint, Dust and Oil Accumulation.” This is also mandated by regulation such as the South Coast Air Quality Management District's Rule 1121 for “Control of Nitrogen Oxides from Residential Type, Natural Gas-Fired Water Heaters.” This Rule dictates the NOx emission level per joule of heat output.
- The present invention is directed to overcoming one or more of the problems set forth above.
- An aspect of the present invention is a pilot burner assembly. The pilot burner assembly includes a pilot burner having a top portion, middle portion and a bottom portion, wherein the top portion of the pilot burner includes a hood that is positioned adjacent to an igniter and a thermocouple. A middle portion of the pilot burner includes at least one opening providing an air inlet.
- Another aspect of the present invention may optionally include a bracket assembly. The bracket assembly may be operatively attached to a pilot burner, a thermocouple assembly and an igniter assembly. Preferably, but not necessarily, a pilot burner is mounted at an angle with the thermocouple located lower than the pilot burner hood, e.g., 60°+/−15° in relationship to the bracket assembly. The bracket assembly may include a vertical portion with attachment holes as well as a u-shaped bracket with an upper opening and a lower opening for receiving a thermocouple. Optionally, the bracket assembly may include a first top plate and a second top plate connected together.
- Still another aspect of the present invention may optionally include a hood. The hood may have at least one opening and preferably includes more than one opening to form a multiple-way hood, e.g., two-way hood. The at least one opening can include a wide variety of geometric shapes and sizes but is preferably triangular with an opening that can provide flame direction and pattern as well as a spark path between an igniter and a pilot burner.
- Yet another aspect of the present invention may optionally include an insert. The insert may include an upper portion, a middle portion and a lower portion. Optionally, the middle portion can include a flange can be positioned on top of a bracket assembly and the lower portion can be threaded. The presence of lint, dust and/or oil will restrict at least one opening, e.g., four (4), created by a hole(s) or slot(s) forming at least one primary air intake orifice. A primary air intake orifice is located in the middle portion of the insert that extends from an inner chamber of the insert to an outer surface of the middle portion of the insert.
- In still another aspect of the present invention may optionally include an orifice spud. The orifice spud controls the primary flow of gas in the pilot burner and restricts the flow of gas. The orifice spud may include a first sidewall, a second sidewall and a nozzle. The nozzle may include an opening. The opening may include a first slot and a second slot that are positioned transverse, e.g., perpendicular, to each other and in fluid communication.
- Another aspect of the present invention may optionally include a ball sleeve. The ball sleeve may provide a compression seal between an orifice spud and a compression nut. Optionally, the ball sleeve may include a triangular portion.
- Still another aspect of the present invention may optionally include a compression nut. The compression nut may provide connection to a gas valve and operate to compress a ball sleeve. The compression nut may be threadedly attached to a threaded end portion for an insert.
- It is another aspect of the present invention includes an igniter. The igniter may include a protruding electrode that can be bent to extend adjacent to an opening in a hood. There may be an insulator that can secure the electrode. An illustrative, but nonlimiting insulator can include ceramic material. The electrode is preferably at least partially covered in an insulating material. The insulator may be secured in the bracket assembly with an upper ring and a combination electrode holder and retainer.
- Yet another aspect of the present invention is a method of utilizing a pilot burner assembly. The method includes positioning a pilot burner, having a top portion, a middle portion and a bottom portion, near a thermocouple and an igniter so that when at least one opening providing an air inlet in the middle portion of the pilot burner is at least partially blocked with lint, oil or dust, then the flame to heat the thermocouple will shrink or lift to the point where it no longer can heat the thermocouple sufficiently to generate enough power to allow for a safety magnet valve to remain energized and will shut-off the associated gas-fired device.
- These and other features and advantages of the present invention will become apparent from the following detailed description of a preferred embodiment which, taken in conjunction with the accompanying drawings, illustrates by way of example the principles of the present invention.
- For a better understanding of the present invention, reference may be made to the accompanying drawings in which:
-
FIG. 1 is a perspective view of the pilot burner of the present invention mounted to a main burner; -
FIG. 2 is an isolated perspective view of an igniter assembly, a thermocouple assembly and a pilot burner in accordance with the present invention; -
FIG. 3 is an exploded, perspective view of the pilot burner in accordance with the present invention and as shown inFIG. 2 ; -
FIG. 4 is a top view of an insert associated with the pilot burner shown inFIG. 3 ; -
FIG. 5 is a cross-sectional view of the insert associated with the pilot burner valve taken along Line 4-4 ofFIG. 4 ; -
FIG. 6 is a cross-sectional view of the insert associated with the pilot burner valve taken along Line 5-5 ofFIG. 5 ; -
FIG. 7 is an isolated view of the igniter assembly in accordance with the present invention and as shown inFIG. 2 ; -
FIG. 8 is a side, cross-sectional view of an orifice spud in accordance with the present invention and as shown inFIG. 3 ; -
FIG. 9 is a top view of an orifice spud in accordance with the present invention and as shown inFIG. 8 ; -
FIG. 10 is a magnified top view of the orifice spud in accordance with the present invention and as shown inFIG. 9 ; -
FIG. 11 is a top view of a ball sleeve in accordance with the present invention and as shown inFIG. 3 ; -
FIG. 12 is a cross-sectional view of the ball sleeve associated with the present invention taken along Line 11-11 ofFIG. 11 ; and -
FIG. 13 is a top view of a compression nut in accordance with the present invention and as shown inFIG. 3 . - While the various features of this invention are hereinafter illustrated and described as being particularly adapted to provide a pilot burner construction for burning gaseous fuel, such as natural or synthetic gas, it is to be understood that the various features of this invention can be utilized singly or in various combinations thereof to provide a pilot burner construction for other types of apparatus as desired. A typical pilot burner is disclosed in U.S. Pat. No. 5,039,300, which issued to Riehl on Aug. 13, 1991, which is incorporated herein by reference. Another example of a pilot burner is disclosed in U.S. Patent Application No. 20030183177, published on Oct. 2, 2003 to Kobayashi et al, which is incorporated herein by reference as well as U.S. Patent Application No. 20010003274, published on Jun. 14, 2001, which is incorporated herein by reference.
- Therefore, this invention is not to be limited to only the embodiment illustrated in the drawings because the drawings are merely utilized to illustrate one of the wide variety of uses of this invention. The valve of the present invention is especially suited for controlling the flow of a combustible gas to a gas-fired appliance such as a furnace, a water heater or a gas-burning fireplace.
- As shown in
FIG. 1 , a pilot burner is generally indicated bynumeral 10. Thepilot burner 10 will be mounted adjacent to athermocouple 20. Preferably, but not necessarily, thepilot burner 10 is mounted at an angle with thethermocouple 20 located lower than thepilot burner hood 12, e.g., 60° +/−15°. During normal operation, ahood 12 will provide flame to heat thethermocouple 20 and ignite amain burner 2. Thethermocouple 20 will allow the safety magnet valve (not shown) to remain energized so that gas can flow into amain burner 2. - During situations where LDO (lint-dust-oil) build-up has occurred, the
hood 12 will continue to provide flame to themain burner 2, but the flame to heat thethermocouple 20 will shrink or lift to the point where it no longer can heat thethermocouple 20 sufficiently to generate enough power to allow for the safety magnet valve (not shown) to remain energized. This will result in an associated gas-fired device shutting off. Thethermocouple 20 is essentially a sensor that is utilized in a gas-fired device for detecting heat from thepilot burner 10. There is anigniter 22 for providing a spark to ignite thepilot burner 10 that is located adjacent to thehood 12 of thepilot burner 10. - Referring now to
FIG. 2 , anigniter 22 and an associatedinsulator 24 are attached to abracket assembly 100 that includes avertical portion 102 with attachment holes 105. Thebracket assembly 100 may include au-shaped bracket 108 with anupper opening 103 and alower opening 104 for receiving thethermocouple 20, as shown inFIG. 1 . This can include a first top plate and a second top plate that are connected together. Any mechanical or chemical connection mechanism will suffice such as arivet 199. Alternatively, theassembly 100 may be unitary. Thebracket assembly 100 is preferably, but not necessarily, designed to withstand at least fifty (50) pounds of push-out force and one hundred and twenty (120) foot-pounds of rotation torque. - There is also the
pilot burner 10 that includes thehood 12 that is mounted on top of thebracket assembly 100 with extendingflange members 101, e.g., four (4). There are holes orslots 112 creating primary air intake orifices located underneath thehood 12 and just above thebracket assembly 100. However, these holes orslots 112 are not limited to being positioned just above thebracket 100 and can be located along the length of thepilot burner 10 both above and below thebracket 100. - Referring now to
FIG. 3 , which is an exploded version of thepilot burner 10 shown inFIG. 2 , which includes thehood 12 having a firsttriangular opening 8 and a secondtriangular opening 9 to create the two-way opening. Although two, triangular-shaped openings are preferred to create a two-way opening, thehood 12 can include a wide variety of geometric shapes, sizes and number of openings. Preferably, but not necessarily, there is a plurality of extendingflange members 101 extending outward from the bottom of thehood 12, e.g., four (4). Thehood 12 provides flame direction and pattern as well as a spark path between theigniter 22 and thepilot burner 10. Thehood 12 is preferably located adjacent to theigniter 22, as shown inFIG. 1 . - Referring now to
FIGS. 3, 4 , 5 and 6, there is aninsert 202 that includes holes orslots 113 located underneath thehood 12 and just above thebracket assembly 100, as shown inFIG. 2 . Thisinsert 202 may include anupper portion 201, amiddle portion 207 and alower portion 206. Optionally, themiddle portion 207 may include aflange portion 204 and thelower portion 207 may be threaded. Theflange portion 204 is optionally positioned on top of thebracket assembly 100. The presence of lint, dust and/or oil will restrict the at least one opening created by at least one hole or slot 113 forming the at least one primary air intake orifice located in themiddle portion 207. This will change the flame characteristics, including the lifting of the flame, to reduce the temperature of thethermocouple 20. When the temperature sensed by thethermocouple 20 is reduced, a safety magnet valve (not shown) will close to stop gas flow to themain burner 2. Thisinsert 202 restricts and controls the gas flow in thepilot burner 10 that provides a small flame to light themain burner 2. - Referring now to
FIG. 4 , there is a cross-sectional top view of theinsert 202. Theupper portion 201 and anoptional flange portion 204 are shown. Referring now toFIG. 5 , the cross section of theinsert 202 includes theupper portion 201, theoptional flange portion 204 and theend portion 206. There is aninner chamber 260 that is in fluid communication with holes orslots 113, i.e., primary air intake orifices, which extend to theouter surface 262 of theinsert 202. The presence of lint, dust and/or oil will restrict the openings created by the holes orslots 113 so that air is restricted from flowing from the holes orslots 113 to theinner chamber 260. This will cause the flame that heats thethermocouple 20, as shown inFIG. 1 , to shrink to the point where it no longer heats thethermocouple 20 effectively and the safety magnet valve (not shown) will close to stop gas flow to themain burner 2. The cross-section defined by Line 5-5 shows the holes orslots 113, i.e., primary air intake orifices, which extend to theouter surface 262 of theinsert 202 to theinner chamber 260. The size of the at least one hole or slot 113 functioning as primary air intake orifice(s) can vary depending on the size and dimensions of thepilot burner 10 and the associated gas-fired device. - Positioned within the
burner 10 is an orifice spud 220, as shown inFIG. 3 . The orifice spud 220 controls the primary flow of gas in thepilot burner 10 and restricts the flow of gas. Referring now toFIG. 8 , the orifice spud includes afirst sidewall 242, asecond sidewall 244 and anozzle 246. Referring now toFIG. 9 , thenozzle 246 includes anopening 248. An illustrative, but nonlimiting, example of anopening 248 includes afirst slot 250 and asecond slot 252 that are positioned transverse, e.g., perpendicular, to each other and there is fluid communication between thefirst slot 250 and asecond slot 252, as shown inFIG. 10 . - There is a
ball sleeve 222 to provide a compression seal between the orifice spud 220 and acompression nut 224, as shown inFIGS. 3, 11 and 12. As shown inFIG. 12 , the ball sleeve may optionally include atriangular portion 261. - As shown in
FIGS. 3 and 13 , there is acompression nut 224 to retain the orifice spud 220 andball sleeve 222. Moreover, thecompression nut 224 provides connection to a gas valve and can compress theball sleeve 222. Thecompression nut 224 is operatively attached to theend portion 206 for theinsert 202, as shown inFIG. 2 . Preferably, but not necessarily, this connection is through interconnecting threads on both thecompression nut 224 and theend portion 206 of theinsert 202. - Referring now to
FIG. 7 , the igniter assembly is generally indicated bynumeral 300. This includes a protrudingelectrode 22 that can be bent to extend to an opening in thehood 12, as shown inFIG. 1 . There is aninsulator 24 that can secure theelectrode 22. An illustrative, butnonlimiting insulator 24, can include ceramic material. Theelectrode 22 is then covered in insulating material, e.g., TEFLON®. TEFLON® is a federally registered trademark of E. I. du Pont de Nemours and Company, having a place of business at 1007 Market Street, Wilmington, Del. 19898. Theinsulator 24 can be secured in thebracket assembly 100 with anupper ring 310, and a combination electrode holder andretainer 306. There may be a connector to attach a bracket assembly that can support thethermocouple 20, as shown inFIG. 1 . - A method of utilizing a
pilot burner 10 is also contemplated with an embodiment of the invention. The method includes positioning apilot burner 10 near athermocouple 20 and anigniter 22 so that when at least one primaryair intake orifice 112 to thepilot burner 10 is at least partially blocked with lint, oil or dust, then the flame to heat thethermocouple 20 will shrink or lift to the point where the pilot burner can no longer can heat thethermocouple 20 sufficiently to generate enough power to allow for a safety magnet valve (not shown) to remain energized and will shut the associated gas-fired device such as themain gas burner 2. - While a particular form of the invention has been illustrated and described, it will also be apparent to those skilled in the art that various modifications can be made without departing from the spirit and scope of the invention. Accordingly, it is not intended that the invention be limited except by the appended claims.
Claims (12)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/351,404 US20060199124A1 (en) | 2005-02-11 | 2006-02-10 | Low NOx pilot burner and associated method of use |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US59377605P | 2005-02-11 | 2005-02-11 | |
US11/351,404 US20060199124A1 (en) | 2005-02-11 | 2006-02-10 | Low NOx pilot burner and associated method of use |
Publications (1)
Publication Number | Publication Date |
---|---|
US20060199124A1 true US20060199124A1 (en) | 2006-09-07 |
Family
ID=36510721
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/351,404 Abandoned US20060199124A1 (en) | 2005-02-11 | 2006-02-10 | Low NOx pilot burner and associated method of use |
Country Status (4)
Country | Link |
---|---|
US (1) | US20060199124A1 (en) |
EP (1) | EP1853851A1 (en) |
MX (1) | MX2007009720A (en) |
WO (1) | WO2006086714A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080029047A1 (en) * | 2004-12-03 | 2008-02-07 | American Water Heater Company | Water heater with lint collection detection |
US20130288188A1 (en) * | 2012-04-30 | 2013-10-31 | Mark Johnson | Lighting apparatus |
ITPD20120211A1 (en) * | 2012-06-29 | 2013-12-30 | A R C S R L | PILOT FLAME IGNITION DEVICE, PARTICULARLY FOR GAS BURNERS |
US10151484B2 (en) | 2014-04-30 | 2018-12-11 | Emerson Electric Co. | Pilot burner assembly and method of assembling same |
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- 2006-02-10 MX MX2007009720A patent/MX2007009720A/en unknown
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080029047A1 (en) * | 2004-12-03 | 2008-02-07 | American Water Heater Company | Water heater with lint collection detection |
US20130288188A1 (en) * | 2012-04-30 | 2013-10-31 | Mark Johnson | Lighting apparatus |
US9416960B2 (en) * | 2012-04-30 | 2016-08-16 | Bevolo Gas & Electric Lights, Inc. | Lighting apparatus |
ITPD20120211A1 (en) * | 2012-06-29 | 2013-12-30 | A R C S R L | PILOT FLAME IGNITION DEVICE, PARTICULARLY FOR GAS BURNERS |
WO2014001396A1 (en) * | 2012-06-29 | 2014-01-03 | A.R.C. S.R.L. | Igniter with pilot flame, particularly for gas-fired burners |
US9746183B2 (en) | 2012-06-29 | 2017-08-29 | A.R.C. S.R.L. | Igniter with pilot flame, particularly for gas-fired burners |
US10151484B2 (en) | 2014-04-30 | 2018-12-11 | Emerson Electric Co. | Pilot burner assembly and method of assembling same |
US10488044B2 (en) | 2014-04-30 | 2019-11-26 | Emerson Electric Co. | Method of assembling pilot burner assembly |
US10684013B2 (en) | 2014-04-30 | 2020-06-16 | Emerson Electric Co. | Power generation system for gas-fired appliances |
Also Published As
Publication number | Publication date |
---|---|
WO2006086714A1 (en) | 2006-08-17 |
MX2007009720A (en) | 2007-09-26 |
EP1853851A1 (en) | 2007-11-14 |
WO2006086714B1 (en) | 2006-12-28 |
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Legal Events
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Owner name: DEUTSCHE BANK AG, LONDON BRANCH,UNITED KINGDOM Free format text: SECURITY AGREEMENT;ASSIGNOR:ROBERTSHAW CONTROLS COMPANY;REEL/FRAME:017921/0846 Effective date: 20060713 Owner name: DEUTSCHE BANK AG, LONDON BRANCH, UNITED KINGDOM Free format text: SECURITY AGREEMENT;ASSIGNOR:ROBERTSHAW CONTROLS COMPANY;REEL/FRAME:017921/0846 Effective date: 20060713 |
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