Claims
- 1. A gas-fired burner tube for a water heater/boiler apparatus comprising an inner tube having a plurality of first perforations and an outer tube superimposed over said inner tube, said outer tube having a plurality of second perforations which are substantially larger than said first perforations, with more than one of said first perforations at least partially underlying each second perforation, said superimposed inner and outer tubes arranged to increase the thickness of said burner tube and to cover a portion of said first perforations.
- 2. A gas-fired burner tube as described in claim 1 wherein said first perforations all have a first size and are uniformly distributed throughout said inner tube.
- 3. A gas-fired burner tube as described in claim 2 wherein said second perforatons have a second size and are uniformly distributed throughout said outer tube.
- 4. A gas-fired burner tube as described in claim 3 wherein said first size is approximately 0.038 inches in diameter.
- 5. A gas-fired burner tube as described in claim 4 wherein said second size is approximately 0.265 inches in diameter.
- 6. A gas-fired burner tube as described in claim 5 wherein said first perforations give said inner tube an open area of approximately 45%.
- 7. A gas-fired burner tube as described in claim 6 wherein said second perforations give said outer tube an open area of approximately 65%.
- 8. A gas-fired burner tube as described in claim 7 wherein said burner tube has a net open area of approximately 29%.
- 9. A metal, tubular gas-fired burner for a water heater/boiler apparatus comprising an inner perforated tube and an outer perforated tube superimposed on said inner perforated tube, said inner perforated tube including a plurality of first perforations of uniform size and distribution thereby giving said inner perforated tube an open area of a first amount, said outer perforated tube comprising a plurality of second perforations of uniform size and distribution that are substantially larger than said first perforations, with more than one of said first perforations at least partially underlying each second perforation, said outer perforated tube having an open area of a second amount which is substantially greater than said first amount, and said outer perforated tube is superimposed over said inner perforated tube such that a portion of said first perforations are covered and said burner portion has a net open area that is less than said first amount.
- 10. A gas-fired burner as described in claim 9, wherein said uniform size of each of said first perforations is approximately 0.038 inches in diameter and said first amount is approximately 45%.
- 11. A gas-fired burner as described in claim 9, wherein said uniform size of each of said second perforations is approximately 0.265 inches in diameter and said second amount is approximately 65%.
- 12. A gas-fired burner as described in claim 9, wherein said net open area is approximately 29%.
- 13. A gas-fired burner as described in claim 9, further comprising a mixing portion connected to said perforated tubes, a venturi portion having an open top connected to said mixing portion, and an orifice supported in said open top, said orifice having a closed body and a circumferential row of orifice apertures in said body whereby when said orifice receives gas from a supply line said gas is introduced from said orifice apertures into said venturi portion of said burner.
- 14. A gas-fired burner as described in claim 13, further comprising a means for supporting said orifice in the center of said open top of said venturi portion of said burner.
- 15. A gas-fired burner as described in claim 14, further comprising a plurality of venturi openings in said venturi portion whereby when fresh combustion air enters said venturi portion through said open top or through said venturi openings a combustible mixture of air and gas is created in said venturi and said mixing portions.
Parent Case Info
This is a continuation of U.S. patent application Ser. No. 824,168, filed Jan. 10, 1986, U.S. Pat. No. 4,723,513.
US Referenced Citations (8)
Continuations (1)
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Number |
Date |
Country |
Parent |
824168 |
Jan 1986 |
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