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Portable forced air heater
| Details |
Inventors: Velie, Wallace W.; Macias, Hector;
Assignee: Scheu Manufacturing Company (Upland, CA)
Primary Examiner: Scott; Samuel
Assistant Examiner: Green; Randall L.
Attorney, Agent or Firm: Fleit & Jacobson
A portable forced air heater having a flame holder positioned between a blower and a combustion chamber. The flame holder has a plurality of holes or openings formed therein to stabilize and control the combustion process within the combustion chamber. The holes or openings are arranged in such manner that the percentage of total flame holder area devoted to holes or openings increases at a general uniform rate as the distance from the center of the flame holder increases. The flame holder also has openings formed therein to support various components of the heater in order to provide a relatively small compact forced air heater. |
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DETAILED DESCRIPTION Accordingly, it is a principal objective of the invention to provide an improved, small, forced air, gas heater.
Also, the present invention provides a heater having a compact configuration which delivers uniform heat output and operates for approximately 8 hours on a standard 5-gallon propane gas bottle (i.
e.
40,000 BTU/hr).
Another objective of this invention is to achieve combustion cleanliness of less than 50 ppm carbon monoxide, with correspondingly low rates of accumulation of soot and carbon.
Still another objective is to provide safe operation in the event of malfunction or misuse.
Accordingly, the heater of the present invention is an improved version of forced air heaters of the type described in the aforementioned U.
S.
Pat.
Nos.
3,494,599 and 3,645,512.
The heater has a combustion chamber positioned downstream of a blower.
The upstream end of the combustion chamber is formed by a flame holder having a plurality of openings formed therein to provide communication between the blower and the combustion chamber.
The openings are arranged in such manner that they stablize and control combustion within the combustion chamber.
The size and placement of holes is selected so that the percentage of total flame holder area devoted to holes or openings increases at a generally uniform rate, as the distance from the center of the flame holder increases.
Preferably, the openings closest to the center are circular-shaped with uniform diameters and are arranged in a plurality of concentric rings.
As the diameter of the rings increases, the number of openings in the rings correspondingly increases.
Since the distribution of holes or openings becomes less critical as the distance from the center of the flame holder increases, holes or openings spaced at greater distances from the center can have a larger diameter than those closer to the center.
In order to provide a compact heater, the flame holder includes openings or holes for supporting a fuel nozzle, a spark plug, a flame sensor, a housing defining a combustion chamber surrounding the fuel nozzle, and a sensor for sensing the buildup of heat in a larger combustion chamber coaxial with and surrounding the aforementioned combustion chamber
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