US 4,360,000 AGranted

Wood burning stove

OwnerStanley L. Downinventor

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Abstract

A wood burning stove comprises a fire chamber of which the upper part is constituted as a heat exchanger. A primary air supply is provided as is a secondary air supply, the secondary air supply permitting air to be mixed with the gaseous products of combustion to support complete combustion of those gaseous products. Both air supplies have dampers, the damper of the secondary air supply being automatic and opening as the damper of the primary air supply is closed. The secondary air supply comprises an inlet manifold interconnecting a plurality of tubular elements which form a fire supporting grate, the tubular elements leading the secondary air beyond the fire to a region in which mixing of that air with the gaseous products of combustion is effected, secondary air passing through the tubular elements being preheated by the burning fuel supported on the grate.

Claims9

Dependent claims

A wood burning stove comprising a fire chamber having a primary combustion region and a secondary combustion region, primary air inlet means for admitting primary air to the primary combustion region of said chamber, air control means for controlling the rate of admission of primary air through said primary air inlet means, and a fuel supporting grate within said fire chamber, said grate comprising of plurality of hollow tubular elements having inlet ends through which secondary air is admitted to said elements and discharge ends disposed at said secondary combustion region from which secondary air issues, fire supporting portions of said elements intermediate said ends constituting a fire support region at said primary combustion region, said elements including portions extending between said fire supporting portions and said discharge ends, said fire supporting portions of said elements constituting heat exchanger means for heating secondary air within said tubular elements, said discharge ends being disposed so that secondary air preheated in said fire supporting portions of said elements by combustion at said primary combustion region, issues from said discharge ends into said secondary combustion region to co-mingle with the gasses from the fire to promote combustion of said gasses, and air control means associated with said tubular elements for controlling the rate of flow of secondary air therethrough, said air control means associated with said tubular elements permitting an increased rate of flow of secondary to said secondary combustion region when the rate of admission of primary air through said primary air inlet means is reduced.

Dependencies are inferred from the claim text.