High Efficiency Combustion Stove

• US 20120060819A1
• Filed: 08/08/2011
• Published: 03/15/2012
• Est. Priority Date: 12/27/2007
• Status: Abandoned Application

• Current Assignee: Henry B. Schur, Larry Hunt
• Original Assignee: Henry B. Schur, Larry Hunt
• Inventors: Hunt, Larry, Schur, Henry B.
• Application Number:
  US13/205,134
• Publication Number:
  US 20120060819A1
• Time in Patent Office: Days
• US Class Current: 126/1.R
• CPC Class Codes: A47J 36/2477 using solid fuel, e.g. with candles
• CPC Class Codes: A47J 36/26 Devices for warming vessels containing drinks or food, especially by means of burners Warming devices with a burner, e.g. using gasoline; Travelling cookers, e.g. using petroleum or gasoline with one burner
• CPC Class Codes: F24B 1/003 on which a removable cooking element is arranged
• CPC Class Codes: F24B 1/022 easily collapsible or easily removable
• CPC Class Codes: F24B 1/182 with additional provisions for cooking
• CPC Class Codes: F24B 5/021 combustion-air circulation

Abstract

The invention is a stove system that is portable, has a double walled external structure for the passage of air used in combustion of the fuel, which air also maintains the external surface at a cool enough temperature that it can be touched, and which air flow prevents the waste of heat laterally to the ambient air from a hot outer surface. This increases cooking efficiency, because almost all heat that reaches the air flow between the two walls is drawn right into the combustion chamber in the form of preheated air by reason of the chimney effect. Thus almost no heat can escape the outside wall except by reaching the cooking pot bottom and pot sides after passing out the cover vents as exhaust. An internal heat concentrator ring improves the overall efficiency of the burner. The stove is preferably powered with coal, and uses about half as much coal as a conventional coal fired stove resulting from cooking efficiency. Provision is made for generation of electrical energy from the excess stove heat. Additionally, special thermally designed cook pots add to the stove system to decrease food cooking time while reducing the fuel required.

Claims

11. A stove comprising:

an outer wall having at least one port for drawing in combustion air;

a bottom attached about its periphery to the outer wall;

an inner wall disposed within and substantially concentric with the outer wall, forming between the outer wall and the inner wall a passageway for combustion air flow, the inner wall surrounding a combustion chamber, the combustion air flow in the passageway minimizing heat loss and increasing heating efficiency;

a removable bucket concentric with and disposed within the inner wall;

a grate disposed within the removable bucket and at the bottom of the combustion chamber for supporting combustible fuel and forming a combustion air flow venturi increasing heating temperature; and

an annular ring cover having a large open center, the open center covered when the stove is in use by a cooking container to heat it, and the annular ring having at least one vent from which heated air exits the stove adjacent sides of the cooking container to further heat it.

12. The stove of claim 11 in which the inner wall is shaped as a truncated cone with the largest diameter as the top.

13. The stove of claim 11 which further comprises a substantial opening in the center of the bottom of the stove suitable for removal of products of combustion such as ash, and which is substantially sealed off during use of the stove by its placement on a flat horizontal surface.

14. The stove of claim 11 in which the removable bucket is comprised of a tapered portion at its top and a lower cylindrical portion, the cylindrical portion being perforated by at least one aperture, and the tapered portion fitting snugly in the lower portion of the truncated cone of the inner wall such that the cylindrical portion projects beneath the bottom of the cone of the inner wall and the at least one aperture is immersed in combustion air flow between the inner and outer walls. Tabs along the circumference of the bucket at the juncture of the taper and the cylinder portion that protrude outward to provide stand-off points to center the bucket and to reduce intimate contact with the inner wall of the stove to reduce the heat transfer to the inner wall.

15. The stove of claim 14 in which the grate is disposed at an intersection of the tapered portion and the cylindrical top of the air inlet portion of the removable bucket on tabs projecting into the bucket portion of the removable bucket.

16. The stove of claim 11 which further comprises an externally adjustable air flow regulator disposed within the passageway between the inner and outer walls on the top cap to cover the exhaust ports and acting as a damper as fuel and weather conditions require.

17. The stove of claim 16 in which the externally adjustable air flow regulator comprises a stationary horizontal annular plate which includes a plurality of perforations and an adjustable horizontal annular plate having an adjusting tab that projects through a slot in the outer wall and having a plurality of perforations wherein a number of perforations in the stationary portion equals a number of perforations in the adjustable portion.

18. The stove of claim 11 which is sized to be portable even in use and which is cool enough in use to be carried with bare hands because of the combustion air flow in the passageway.

19. The stove of claim 11 fitted with a thermoelectric generator to produce an electric current during stove use. Said generator consisting of a heat pipe conductor, a hot side heat sink, a thermoelectric module, a cold side heat sink and a means of dissipating the heat from the cold side and a control module.

20. A control module of claim 19 containing the electronic regulation circuit, the storage battery, the output regulator and the input and output attachment means along with the visual status and mode indicators.

31. The grate of claim 15 which is placed in its center a perforated, cylindrical chimney section which focuses the draft and allows for proper distribution of the fuel.

21. Cook pot specifically mated and designed to a stove to allow the stove to take full advantage of its design features of increased efficiency and reduced fuel consumption comprising a series of annular rings dispersed around the bottom of the pot to act as heat collectors.

22. The cook pot of claim 21 having heat collector rings of such that the pot bottom and the ring tops are in direct contact with each other to allow for the maximum heat transfer.

23. The Pot of claim 22 wherein said heat collector rings are concentric with each other and having openings spaced around each ring to allow for even heat flow distribution to all rings.

26-1. A stove of claim 1 with a support means to raise the stove off the ground and allow for ease of use while in operation.