Stoves and furnaces – Stoves – Heating
Patent
1995-10-23
1997-08-19
Yeung, James C.
Stoves and furnaces
Stoves
Heating
126 60, 126193, 126198, F24C 114
Patent
active
056577427
DESCRIPTION:
BRIEF SUMMARY
This invention relates to solid fuel heating appliances such as stoves.
Solid fuel heating stoves have been in common use for many hundreds of years. Such stoves usually have a firebox and an ash chamber which may be separate parts of a stove. Alternatively they may be present as parts of one chamber. A common arrangement for a stove is to have a primary air control for updraft air, which is adjustable to control the burn speed of the appliance.
For some time now there has been a desire to improve the emissions of fires so as to reduce environmental pollution of the atmosphere. There have been many attempts worldwide to improve the combustion efficiency of stoves, thereby reducing the smoke emitted by them. Conventional air controls control the burning speed of a fire. However, restricting air to the fire (in order to slow down its burning) causes air starvation and prevents full combustion. I believe that it is important for the temperature in the firebox of a stove to be high in order to achieve fuller combustion, and reduce smoke. Preheating air flow to the fire has a ,considerable advantage in this respect. It has been accepted that preheating combustion air has considerable advantages in promoting a lively and clean burning fire. Many devices have been developed to preheat combustion air and then pass it to parts of the firebox.
It is known to provide an inlet to a stove at the bottom of the stove underneath the ash chamber to provide a means for combustion air to enter a stove. In such a stove an air supply is taken from the external surroundings of the stove through the inlet into a preheating chamber underneath the ash chamber, the air is then fed through a preheating system comprising passageways and conduits, and is eventually fed to an upper portion of the firebox which is disposed above the ash chamber. The preheating chamber and the passageways are at high temperatures relative to the combustion air and as a result the combustion air is preheated before it enters into the firebox.
It remains a problem, however, that the combusted air is never heated to a temperature which is equivalent to the combustion temperature in the fire-box.
It is an aim of the present invention to provide a new heating appliance, and associated methods of use, to attempt to alleviate at least some of the problems discussed above.
According to a first aspect of the invention I provide a heating appliance having a firebox, an ash chamber and preheating means in which the preheating means defines more than one wall of the ash chamber.
The skilled reader will understand that the term "wall" is a general term which covers side, front and rear walls, and top and bottom walls of the ash chamber.
Preferably the preheating means defines the whole of a wall of the ash chamber. The preheating means may provide only part of an ash chamber instead of the full length, or area of the wall. Preferably the preheating means comprises two walls of the ash chamber. However the preheating means may comprise three walls of the ash chamber. Preferably the ash chamber is a trough surrounded by the preheating means on at least two sides. Preferably the trough is U-shaped in cross-section. The trough preferably defines the bottom wall and both side walls of the ash chamber, and preferably defines the whole, or substantially the whole, of the area of the bottom wall, and/or at least one of the side walls. The ash chamber may be defined by raised portions of the preheating means.
Preferably the ash chamber trough is of a uniform cross-section which co-operates with the ash pan. The ash pan may be in sliding engagement with the ash chamber trough.
There may be a primary preheating chamber which lies beneath the ash chamber. Outer portions of the side regions of said preheating chamber may extend upwardly on two or more sides to form a trough or seat arrangement.
Preferably air supply passages extend upwardly from the raised outer portions of the primary preheating chamber. These air supply passages may rise up either side of the interior of the st
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