Combustion – Burner having electrical heater or igniter – Spark electrode in front of or adjacent fuel discharger
Reexamination Certificate
1999-11-24
2001-03-06
Price, Carl D. (Department: 3743)
Combustion
Burner having electrical heater or igniter
Spark electrode in front of or adjacent fuel discharger
C431S187000
Reexamination Certificate
active
06196834
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention generally relates to pilot burners and, more specifically, to pilot burners for automatic ignition of oxy-fuel burners.
For automatic ignition of an oxy-fuel burner it is necessary to have a pilot burner and control equipment which ensures that the pilot burner is operating before the main burner begins to operate. The pilot burner typically operates on a gaseous fuel such as propane and oxygen as oxidant rather than air. The use of oxygen offers the advantages of safe operation, high capacity, and small dimensions.
While prior art pilot burners have generally performed their function, they are relatively complicated and are relatively expensive to produce. Accordingly, there is a need in the art for an improved pilot burner which is relatively simple in construction, is relatively inexpensive to produce, and has improved reliability and ease of service.
BRIEF SUMMARY OF THE INVENTION
The invention provides a pilot burner assembly including an ignitor having an electrically conducting rod extending axially from an ignitor head. An axially extending first tube is disposed around the ignitor rod to form a first fluid passageway and has a first tube opening. A first manifold has an eccentric first axial bore therein, a first manifold opening for attachment to a first fluid supply fitting, and a first lateral passageway communicating the first manifold opening with the first axial bore. The first tube is disposed at the first axial bore and the first tube opening cooperates with the first lateral passageway to communicate the first manifold opening with the first fluid passageway. A coupling is provided having an axial coupling bore. The coupling is attached to the first manifold such that the axial coupling bore is aligned with the first axial bore and the ignitor head is received in the coupling such that the ignitor projects through the coupling. An axially extending second tube is disposed around the first tube to form a second fluid passageway and has a second tube opening. A second manifold has an eccentric second axial bore therein, a second manifold opening for attachment to a second fluid supply fitting, and a second lateral passageway communicating the second manifold opening with the second axial bore. The second tube is disposed at the second axial bore, the second tube opening cooperates with the second lateral passageway to communicate the second manifold opening with the second fluid passageway, and the second manifold is attached to the first manifold such that the second axial bore is aligned with the first axial bore and the second manifold opening extends laterally in substantially the same direction as the first manifold opening.
The ignitor rod is fitted with an electrically insulating sleeve. The ignitor head is externally threaded and the coupling is internally threaded. The pilot burner also includes an internally and externally threaded adaptor. The adaptor receives the ignitor head therein and the adaptor is received in the coupling such that the ignitor projects through the adaptor and the coupling.
The first tube is disposed concentrically around the ignitor rod and the first fluid passageway is annular. Spacers are disposed between the first tube and the ignitor rod to maintain the ignitor rod substantially concentric in the first tube. The first tube opening is lateral and the first manifold comprises a cylindrical wafer. The first manifold opening is internally threaded. The coupling is a cylindrical wafer. The axial coupling bore has a smaller diameter than the first axial bore, the first axial bore extends through the first manifold, and an end of the first tube abuts against the coupling. The axial coupling bore is concentric with the first axial bore. The second tube is disposed concentrically around the first tube and the second passageway is annular. Spacers disposed the between the first tube and the second tube to maintain the first tube substantially concentric in the second tube. The second tube opening is lateral. The second manifold is a cylindrical wafer. The second manifold opening is internally threaded. The second axial bore has a greater diameter than the first axial bore, the second axial bore extends through the second manifold, and an end of the second tube abuts against the first manifold. The second axial bore is concentric with the first axial bore. The manifolds are formed of a single piece of material.
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AGA Gas, Inc.
Pearne & Gordon LLP
Price Carl D.
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