Claims
- 1. In a water boiler having a convection burner and coiled heat exchanger tube contained within an enclosed shell, the coiled tube being located between the core and the enclosed shell, the core and the enclosed shell being separated by an aggregate distance,
- the burner generating products of combustion including unburned residue, the center of the coiled tube being plugged by a core extending therein,
- the improvement of the core being metal, the core having a top directed towards the burner, the top of the core having a reducing diameter facing the burner, means for said reducing diameter top to concentrate the products of combustion flowing longitudinally away from the burner between the core and the coiled heat exchanger tube at the interjection between the top of the core and the surrounding coiled heat exchanger tube so as to develop a relatively high temperature threat so as to destroy any unburned residue at this location,
- heat exchanging elements, said heat exchanging elements extending off of the coiled tube and said heat exchanger elements filling the aggregate distance between the core and the enclosed shell.
- 2. The improvement of claim 1 characterized in that said reducing diameter top is a cone.
- 3. The improvement of claim 2 characterized in that said cone is truncated.
- 4. In a water boiler having a convection burner and coiled heat exchanger tube contained within an enclosed shell, the convection burner generating products of combustion including unburned residue, the center of the coiled tube being plugged by a core extending therein, the core having a top directed towards the burner and a length,
- the convection burner being at one longitudinal inlet and of the shell and the core being at the other longitudinal outlet end of the shell, the coiled tube being spaced from the core and enclosed shell by a radial aggregate distance, the boiler having a flue with a cross sectional area,
- the improvement of the core being non-replaceable, the core being metal, the core being hollow, the top of the core having a reducing diameter facing the burner,
- said hollow in the core having a length, said length of said hollow extending for over half the length of the core,
- means for said reducing diameter top to concentrate the products of combustion flowing longitudinally away from the convection burner past the core at the intersection between the top of the core and the surrounding coiled heat exchanger tube so as to develop a relatively high temperature threat so as to destroy any unburned residue at this location,
- the coiled heat exchanger tube having heat exchanging elements, said heat exchanging elements extending off of the coiled tube, said heat exchanging elements filling the radial aggregate distance between the core and the enclosed shell,
- and said heat exchanging elements defining longitudinally extending discreet air flow passages past the core for the products of combustion past the core.
- 5. The improvement of claim 4 characterized in that said heat exchanging elements are fins, said fins defining an aggregate cross sectional area for the longitudinal movement of the products of combustion, said aggregate cross sectional area being greater than the cross sectional area of the flue, and said fins spirally extending about the coiled tube.
- 6. The improvement of claim 4 characterized by the addition of a spacer, said spacer being located between the core and the outlet end of the shell, and the core being spiced from the outlet end of the shell by said spacer.
- 7. The improvement of claim 4 characterized in that said reducing diameter top is a truncated cone, and said truncated cone having a substantially flat top surface.
- 8. The improvement of claim 4 characterized in that the shell has a cylindrical outer wall and two end caps and said two end caps being welded to said cylindrical outer wall to integrally form the shell.
- 9. The improvement of claim 4 characterized in that said hollow has a cross section and said cross section being reducing for over half of said length of said hollow.
- 10. The improvement of claim 9 characterized in that said reducing cross section is linear.
- 11. The improvement of claim 9 characterized in that said cross section of said hollow is uniform for less than half of said length of said hollow.
- 12. The improvement of claim 4 characterized in that said fins have a cross section and said cross section of said fins being solid.
- 13. The improvement of claim 12 characterized in that said fins are spirally wrapped about the coiled heat exchanger tube.
- 14. The improvement of claim 4 characterized in that the core has a melting temperature and said relatively high temperature is below said melting temperature of the core.
- 15. The improvement of claim 4 characterized in that the products of combustion flow longitudinally away from the convection burner past the coiled heat exchanger tube between such tube and the enclosed shell.
- 16. The improvement of claim 4 characterized in that said heat exchanging elements are spirally wrapped about the coiled heat exchanger tube.
- 17. The improvement of claim 4 characterized in that the outer diameter of the core is equal to or slightly oversized in respect to the inner diameter of the heat exchanger tube within the shell.
- 18. In a water boiler having a convection burner with an inner end and coiled heat exchanger tube contained within an enclosed shell having an outlet, the burner producing products of combustion including unburned residue, the burner having an inward end, the boiler having a flue with a cross sectional area,
- the center of the coiled tube being plugged by a core having an outer diameter and extending in the enclosed shell with a top facing the burner and a bottom facing the outlet of the shell, the burner being at one longitudinal inlet end of the shell and the core being at the other longitudinal outlet end of the shell spaced therefrom, the coiled tube being spaced from the core and enclosed shell by an aggregate radial distance,
- the improvement of the shell having a cylindrical outer wall and two end caps, said two end caps being welded to said cylindrical outer wall t) integrally form the shell, the core being metal, the core being hollow,
- said hollow in the core having a length and a truncated cone cross section, said truncated cone cross section extending for over half said length of said hollow,
- the top of the core having a constantly reducing diameter facing the burner, means for said reducing diameter top to concentrate the products of combustion flowing longitudinally away from the convection burner between the core and the coiled heat exchanger tube at the intersection between the top of the core and the surrounding coiled heat exchanger tube so as to develop a relatively high temperature threat so as to destroy any unburned residue at this location,
- the coiled heat exchanger tube having heat exchanging fins, said heat exchanging fins being circular in cross section with said tube substantially centered therein, said heat exchanging fins extending off of the coiled tube,
- said heat exchanging fins filling the aggregate radial distance between the core and the enclosed shell, said heat exchanging fins contacting the outer diameter of the core and the shell,
- said heat exchanging fins defining an aggregate cross sectional area for the longitudinal movement of the products of combustion, said aggregate cross sectional area being greater than the cross sectional area of the flue,
- and said heat exchanging fins producing longitudinal but not radial movement of the products of combustion between the core and enclosed shell as such products move between the inlet and outlet ends.
- 19. The improvement of claim 18 characterized in that said cross section of said hollow is uniform for less than half of said length of said hollow.
- 20. The improvement of claim 18 characterized by the addition of a spacer, said spacer being located between the core and the outlet end of the shell, and the core being spaced from the outlet end or the shell by said spacer.
- 21. The improvement of claim 20 characterized in that said cross section of said hollow is uniform for less than half of said length of said hollow.
- 22. The improvement of claim 18 characterized in that said reducing diameter top is a truncated cone, and said truncated cone having a substantially flat top surface.
- 23. In a water boiler having a burner with an inner end and coiled heat exchanger tube contained within an enclosed shell having an outlet, the burner producing products of combustion including unburned residue, the burner having an inward end, the boiler having a flue with a cross sectional area,
- the center of the toiled tube being plugged by a core having an outer diameter and extending in the enclosed shell with a top facing the burner and a bottom facing the outlet of the shell,
- the burner being at one longitudinal end or the shell and the core being at the other longitudinal end of the shell spaced therefrom, the soiled tube being spaced from the core and enclosed shell by an aggregate radial distance,
- the improvement of the shell having a cylindrical outer wall and two end caps, said two end caps being welded to said cylindrical outer wall to integrally form the shell, the core being metal, the core being hollow,
- the top of the care having a constantly reducing diameter facing the burner means for said reducing diameter top to concentrate the products of combustion flowing longitudinally away from top, convection burner between the core and the coiled heat exchanger tube at the intersection between the top of the core and the surrounding coiled heat exchanger tube so as to develop a relatively high temperature threat so as to destroy any unburned residue at this location,
- the products of combustion also flowing longitudinally away from the convection burner past the coiled tube between such tube and, the enclosed shell,
- said hollow in the core having a length and a truncated cone cross section, said truncated gone crops section extending for over halt said length of said hollow,
- the coiled hint exchanger tube having heat exchanging fins, said heat exchanging fins being circular in cross section with said tube substantially centered therein, said heat exchanging fins extending off of the coiled tube,
- said heat exchanging fins being spirally wrapped about the coiled tube, said heat exchanging fins filling the aggregate radial distance between the core and the enclosed shell,
- the outer diameter of the core being equal to or slightly oversized in respect to the inner diameter of said heat exchanging fins when the coiled tube is within the shell, said heat exchanging fins contacting the outer diameter of the core and the shell,
- said heat exchanging fins defining an aggregate cross sectional area for the longitudinal movement of the products of combustion, said aggregate cross sectional area being greater than the cross sectional area of the flue,
- and said heat exchanging fins producing longitudinal but not radial movement of the products of combustion between the core and enclosed shell as such products move; between the inlet and outlet ends.
Parent Case Info
This application is a continuation-in-art of U.S. Ser. No. 08/525,223 filed Sep. 8, 1995 Pat. No. 5,671,700 which application was a continuation application of U.S. Ser. No. 08/260,335 filed Jun. 15, 1994, now abandoned.
US Referenced Citations (7)
Continuations (1)
|
Number |
Date |
Country |
Parent |
260335 |
Jun 1994 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
525223 |
Sep 1995 |
|