US4393814A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-fueled boiler
Assignee: Individual
•
Filing: 1981-04-08
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Granted: 1983-07-19
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Expires: 2001-04-08
Abstract
Abstract An improved multi-fueled hot water or steam boiler comprising a plurality of compartments, one compartment for the combustion of a solid fuel, such as wood or coal, and the other for the combustion of a liquid fuel and separated from each other and the exterior of the boiler by water-conducting walls; a water supply tank positioned above one of the compartments and connected to the water-conductive walls; and a plurality of horizontal fire tubes passing through the water supply tank and connecting one compartment to an exhaust flue. The compartment not positioned below the water supply tank has a water-conductive ceiling slanted upwardly toward and connected to the water supply tank. One compartment has an adjustable air-flow secondary damper in addition to a primary air damper. The water-conductive walls, fire tubes, adjustable secondary damper, and upwardly slanting water-conductive ceiling reduce boiler heat losses and improve boiler efficiency.
Inventors
- 👤 Raymond Sievert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:36
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/22; F24H1/24; F24H1/26; F24H1/28; F22; F22B; F22B31/00; F22B31/04; F23; F23L; F23L13/00; F24H1/46; F24H2230/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
229 words
A multi-fuel boiler having improved combustion efficiency comprising two compartments, said compartments each including external walls and an internal wall partially separating the compartments from each other to permit passage of heated gas from one compartment to the other so that the fuels may be burned in each compartment in sequence or simultaneously, wherein said compartments comprise a front compartment for combustion of a solid fuel positioned and connected to and communicating with said front compartment, a rear compartment for combustion of a fluid fuel, and an ash pit positioned in front of said rear compartment and beneath said front compartment and separated from said front compartment by a grate to hold solid fuel; means in one compartment to burn fluid fuel and means in the other compartment to burn solid fuel, a water-filled supply tank positioned above said front compartment; wherein said internal wall between the two compartments is a substantially vertical water-conductive wall connected to said water supply tank to heat the water of said tank; a plurality of fire tubes each having inlet and exhaust orifices, said fire tubes passing through said water supply tank, said fire tubes having their inlet orifices connected to said front compartment to receive hot combustion gases from both said compartments, said fire tubes heating the water within the supply tank and being connected to a flue for exhausting combusted gases.
Claim 2
Dependent Claim
229 words
A multi-fuel boiler having improved combustion efficiency comprising two compartments, said compartments each including external walls and an internal wall partially separating the compartments from each other to permit passage of heated gas from one compartment to the other so that the fuels may be burned in each compartment in sequence or simultaneously, wherein said compartments comprise a front compartment for combustion of a solid fuel positioned and connected to and communicating with said front compartment, a rear compartment for combustion of a fluid fuel, and an ash pit positioned in front of said rear compartment and beneath said front compartment and separated from said front compartment by a grate to hold solid fuel; means in one compartment to burn fluid fuel and means in the other compartment to burn solid fuel, a water-filled supply tank positioned above said front compartment; wherein said internal wall between the two compartments is a substantially vertical water-conductive wall connected to said water supply tank to heat the water of said tank; a plurality of fire tubes each having inlet and exhaust orifices, said fire tubes passing through said water supply tank, said fire tubes having their inlet orifices connected to said front compartment to receive hot combustion gases from both said compartments, said fire tubes heating the water within the supply tank and being connected to a flue for exhausting combusted gases.
Claim 3
Dependent Claim
32 words
An improved multi-fuel boiler as in claim 1 wherein at least some of said external walls are water-conductive walls connected to said water supply tank to heat the water of said tank.
Claim 4
Dependent Claim
31 words
An improved multi-fuel boiler as in claim 1 wherein the fluid fuel compartment has an elongated water-conductive wall connected to said water supply tank to heat the water of said tank.
Claim 5
Dependent Claim
32 words
An improved multi-fuel boiler according to claim 1 wherein at least one of said compartments has an adjustable secondary damper for providing a variable flow of secondary air to improve combustion efficiency.
Claim 6
Dependent Claim
30 words
An improved multi-fuel boiler according to claim 1, wherein, said fire tubes are substantially horizontal and said floor of said front compartment and said ash pit is a refractory slab.
Claim 7
Dependent Claim
78 words
An improved multi-fuel boiler according to claim 5 wherein said front compartment has a fire box door having an adjustable secondary damper, said adjustable secondary damper comprising a substantially vertical planar baffle mounted interiorly and spaced horizontally therefrom by bolts passing through said door to engage nuts embedded in and penetrating through said baffle, said secondary air flow being admitted and adjusted by torquing said bolts thereby varying the distance between said baffle and said front compartment door.
Claim 8
Dependent Claim
52 words
An improved multi-fuel boiler according to claim 1 wherein said front compartment is partially separated from said rear compartment and said ash pit is completely separated from said rear compartment by said substantially vertical water-conductive interior wall and the upper edge of said interior wall is slanted toward said rear compartment ceiling.
Claim 9
Dependent Claim
59 words
An improved multi-fuel boiler according to claim 1 wherein said ash pit has an ash pit door having therein a primary damper for primary air for combustion and a shaker handle penetrating said ash pit door to provide a means for agitating said burning solid fuel to cause ashes and like solid matter to fall into said ash pit.
References Cited (Backward Citations)
BE631206A
Cited
US1456707A
Cited
US851183A
Cited
US1154877A
Cited
FR2278040A1
Cited
US4206723A
Cited
US4296711A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-07-18 | 1987-01-17 | 1987-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-18 | 1991-01-17 | 1991-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-18 | 1995-01-17 | 1995-07-19 | $7700.00 | Window Closed / Lapsed |