Stoves and furnaces – Stoves – Heating
Patent
1981-11-04
1985-12-31
Scott, Samuel
Stoves and furnaces
Stoves
Heating
126 67, 126 83, 126152B, 126163A, 431347, F24C 114
Patent
active
045614202
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a woodburning stove, a fireplace or the like comprising a hearth in a combustion chamber with a flue outlet at the top, said hearth being provided with a front opening or door.
Such fireplace in the form of a stove with two chambers is disclosed in U.S. Pat. No. 1,771,303 in which stove the separation between the chambers is formed by a grate in an always open position.
In accordance with advantageous features of the woodburning stove, fireplace or the like according to the invention a hearth is provided in a chamber with a flue outlet at a top thereof, with the hearth being provided with a front opening or front door. At least a part of a bottom of the hearth or chamber includes a preferably closable bottom plate. A further chamber for solid, liquid, or gaseous fuel is provided below the bottom plate with the chamber being underblast supplied, preferably, through an inlet air damper. A shaking grate is disposed above an ashpit, with the further or lower chamber being lined with a refractory material such as firebricks. A flue outlet from the lower chamber to the upper chamber is provided and is disposed preferably, at a rear end of the plate. By virtue of these features it was noticed that a substantially total combustion of the flue gas from the fuel suppled to the lower chamber was obtained therein. Simultaneously, the flue temperature became lower than that of a flue gas passing the grate as was the case in the stove according to the above noted U.S. patent. Furthermore, the combustion temperature is high and the burning time long for a given fuel supply compared to the same amount of fuel and the combustion in, for example, a conventional heating stove.
Furthermore, the bottom plate may serve as firing cap for the lower chamber as well as heat accumulating and heat reflecting device for the lower chamber.
In accordance with further features of the present invention, the bottom plate has a thickness of a plate of at least 5 mm and comprises one at least substantially air impermeable cover plate of iron and/or ceramic material. The flue duct or flue outlet from the lower chamber extends around the bottom plate to the upper chamber whereby it is possible to provide a particularly simple embodiment of the bottom plate in the fireplace or woodburning stove.
By providing a bottom plate which includes a preferably exchangeable subplate arranged below the cover plate at a distance therefrom of 0.1-15 mm and, preferably, 2 mm, which plate is provided with openings, whereby the glow temperature of the bottom plate gets higher than would be the case if the bottom plate comprises one single plate only. Consequently the combustion of the flue gas from the fuel in the lower chamber is more complete and thereby a larger emission of heat is supplied to the walls of the lower chamber, and the temperature of the bottom plate surface against the upper chamber is lower, which means a longer life of the upper plate than the bottom plate. Preferably, the lower plate is interchangeably mounted on the cover plate of the bottom plate as to reduce the maintenance costs.
To increase the above mentioned effects, in accordance with the present invention, the inner space between the two plates is filled with a refractory material such as asbestos or a similar high temperature resistant material. Additionally by preforming the bottom plate as a whole, the weight of which can be reduced as the upper cover plate is made thinner than in case of an air interspace between the cover plates and subplate.
Advantageously, the bottom face of the bottom plate has a larger surface area than the top face thereof so that the bottom plate surface facing the lower chamber is provided with a larger glow surface and contact surface with the flue gas in the lower chamber without an increase of the top side temperature of the bottom plate.
According to further features of the present invention, the bottom face of the bottom plate is provided with cam or rib-shaped projections whereby the underside surface is increased
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Dalso Maskinfabrik AF 1976 A/S
Flanigan Allen J.
Scott Samuel
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