HIGH EFFICIENCY STOVE
A high efficiency stove has a chamber attached to a base. The chamber is liquid tight and holds liquid fuel such as alcohol within. At least one heat conductor is provided to capture heat and redirect it back into the fuel to increase the gasification process required for combustion. This heat is normally lost in conventional stoves. This greatly increases the efficiency of the stove and allows small size stoves to have a heat output superior to conventional stoves. In one embodiment, removable heat conductors are used to adjust heat output. In another embodiment an adjustment sleeve is used that effectively changes the height of the chamber to adjust output. Another embodiment utilizes an outer sleeve that rotates to open and close at least one airflow opening provided for that purpose. One embodiment includes cooking support legs that allows a user to use a pot or pan.
This application is a continuation of U.S. patent application Ser. No. 12/793,713 filed Jun. 4, 2010, and entitled “High Efficiency Stove.”
BACKGROUND OF THE INVENTIONThe ability to control fire and use it for heating, cooking, metal working, etc. has led to a complete change in the way humans live and the fire revolution is not really over. Without control over fire, modern life would not be possible.
Open air campfire type fires were the most prevalent kind of controlled fire in our early history. Eventually, our ancestors learned to bring the open air fire inside their dwellings to heat and cook while sheltered from the environment. Indoor fires were basically fire pits with a way to vent the smoke and gasses produced, but eventually true stoves were invented that enclosed the fire and more evenly distributed the heat produced and were safer to operate. Benjamin Franklin invented a stove that greatly improved the efficiency and helped many people to be more comfortable and make more efficient use of fire.
The first portable stove was invented in the 19th century and used kerosene as the fuel. A stove that used alcohol was known in the early 1900's. Although technology has rapidly progressed since then, the basic alcohol stove has not changed very much since then. There is a need for an efficient, simple to operate alcohol stove that is portable and easy to transport and set up and safe to use.
SUMMARY OF THE INVENTIONA high efficiency stove has a chamber attached to a base. The chamber is liquid tight and holds liquid fuel such as alcohol within. At least one heat conductor is provided to capture heat and redirect it back into the fuel to increase the gasification process required for combustion. This heat is normally lost in conventional stoves. This greatly increases the efficiency of the stove and allows small size stoves to have a heat output superior to conventional stoves. In one embodiment, removable heat conductors are used to adjust heat output. In another embodiment an adjustment sleeve is used that effectively changes the height of the chamber to adjust output. Another embodiment utilizes an outer sleeve that rotates to open and close at least one airflow opening provided for that purpose. One embodiment includes cooking support legs that allows a user to use a pot or pan.
Other features and advantages of the instant invention will become apparent from the following description of the invention which refers to the accompanying drawings.
In the following detailed description of the invention, reference is made to the drawings in which reference numerals refer to like elements, and which are intended to show by way of illustration specific embodiments in which the invention may be practiced. It is understood that other embodiments may be utilized and that structural changes may be made without departing from the scope and spirit of the invention.
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A heat conductor 120 is provided to add to the thermal conductivity of the stove. A plurality of heat conductors 120 may be used to further enhance the heat output of stove 100. In use, the operator may add or subtract heat conductors 120 as desired to obtain the best result. Liquid fuel 130 is added to chamber 110 and then ignited. As fuel 130 burns, heat conductors 120 heat up and enhance the transformation of liquid fuel 130 to a gaseous state needed for combustion. As additional heat conductors 120 are added, the heat output of stove 100 is increased since heat conductors 120 redirect the heat back into fuel 130 which increases the gasification of fuel 130 which is required for combustion.
This heat is normally lost to the environment in conventional stoves. Heat conductors 120 are made of copper which has a high thermal conductivity. Heat conductors 120, once heated, require little heat to maintain their temperature, thus increasing stove 100 efficiency. Of course other high thermally conductive materials such as aluminum may be used without departing from the present invention as long as their melting temperature is sufficiently high.
To adjust the heat output of stove 100, the user slides an adjusting sleeve 115 up to slow down the output and down to increase the heat produced with intermediate outputs corresponding to the height selected. Heat conductors 120 are permanently mounted within base 140. Liquid fuel 130 is alcohol although other similar fuels may be used.
Adjusting sleeve 115 is provided to slide up and down over chamber 110 to effectively adjust the height of stove 100. The height adjustment controls the heat output of stove 100 by controlling the exposure of heat conductors 120 to the surrounding air and the amount of air available for combustion.
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A plurality of air flow openings 650 may be provided to further enhance the control a user has over the combustion within chamber 610. Airflow openings 650 may be provided in pairs, three, four, five or more limited by the amount of space present along the wall of chamber 610 and structural considerations. As inner sleeve 620 is rotated, all openings are adjusted in unison to control the flow of air.
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A primer tray 780 wraps around a portion of chamber 720 and is disposed just below air adjustment opening 750. A flammable fluid such as alcohol is added to primer tray 780 and ignited. This flame ignites fluid 130 within chamber 720 and also helps direct warm air in and through air adjustment opening 750 which encourages a convection air flow to begin thereby increasing the efficiency of stove 700.
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Although the instant invention has been described in relation to particular embodiments thereof, many other variations and modifications and other uses will become apparent to those skilled in the art.
Claims
1. A high efficiency stove comprises:
- a base;
- a chamber defining a fuel containing portion adapted to hold fuel;
- said chamber having a bottom edge;
- said bottom edge being joined to an upper portion of said base wherein said fuel containing portion is sealed to prevent leakage of said fuel; and
- at least one heat conductor adapted to fit within said chamber.
2. The high efficiency stove of claim 1 wherein said at least one heat conductor is adapted to transfer heat from a flame to said fuel.
3. The high efficiency stove of claim 2 wherein the amount of heat transferred by said at least one heat conductor is adjustable by a user.
4. The high efficiency stove of claim 1 wherein said at least one heat conductor is adapted to extend past an upper edge of said chamber.
5. The high efficiency stove of claim 1 wherein said at least one heat conductor is removable.
6. The high efficiency stove of claim 1 further comprising an adjusting sleeve telescopically fitting over said chamber wherein said adjusting sleeve effectively changes the height of said chamber.
7. The high efficiency stove of claim 6 wherein said at least one heat conductor is permanently affixed to said base.
8. The high efficiency stove of claim 6 wherein said adjusting sleeve is adapted to selectively move between a maximum position which is at least as high as a top of said at least one heat conductor and a minimum position which is generally the same height as an upper edge of said chamber.
9. The high efficiency stove of claim 1 further comprising:
- an outer sleeve concentrically disposed over said chamber wherein said outer sleeve is rotatable; and
- at least one air adjustment opening in a side portion of said chamber and a corresponding side portion of said outer sleeve whereby said outer sleeve is rotatably adjustable between a maximum airflow position and a no airflow position.
10. The high efficiency stove of claim 9 further comprising a primer tray disposed around an outer portion of said chamber wherein a flammable fluid is held therein.
11. The high efficiency stove of claim 10 further comprising at least three cooking leg supports removeably attached to said base wherein said cooking leg supports are adapted to support a cooking pan over said high efficiency stove.
12. The high efficiency stove of claim 9 wherein said at least one heat conductor is substantially straight with a curved end whereby insertion and removal is enhanced.
13. The high efficiency stove of claim 1 further comprising at least one heat conductor sleeve disposed on an inner surface of said chamber whereby said at least one heat conductor sleeve is adapted to provide support for said at least one heat conductor.
14. The high efficiency stove of claim 10 wherein said at least one heat conductor is generally u-shaped.
15. The high efficiency stove of claim 1 wherein said chamber is adapted to contain a liquid fuel.
16. The high efficiency stove of claim 15 wherein said liquid fuel is alcohol.
17. The high efficiency stove of claim 1 further comprising a generally central support disposed on a bottom portion of said chamber wherein a portion of said at least one heat conductor is adapted to fit within said central support.
18. The high efficiency stove of claim 17 wherein said at least one heat conductor is generally m-shaped.
19. The high efficiency stove of claim 1 wherein said at least one heat conductor is made of aluminum.
20. The high efficiency stove of claim 1 wherein said at least one heat conductor is made of copper.
21. The high efficiency stove of claim 9 wherein said outer sleeve is adapted to selectively move between a maximum position and a minimum position.
Type: Application
Filed: Nov 29, 2011
Publication Date: Nov 29, 2012
Inventor: Charles A. Johnson (Quakertown, PA)
Application Number: 13/305,944
International Classification: F23D 5/12 (20060101); F24C 5/02 (20060101); F23D 5/04 (20060101); F23D 11/44 (20060101);