| 摘要 |
An adjustable primary air supply for wood burning device comprises at least one but preferably two thermostatic bimetal elements which, by bending with temperature variations, directly actuate a flap That opens and closes the air entry opening. Primary Air is the air used to control the bum rate and it is adjusted in order to achieve the desired b um rates and Secondary Air is the air used to complete the combustion and is not adjustable. Using these two sources of air, the invention consists of a device, which allows the primary air supply to remain open until proper burning is established. Therefore, when the temperature of the appliance rises, the combustion air gradually decreases to its preset value by having the primary air supply automatically shut oft as temperature increases. A higher temperature indicates that the wood is sufficiently hot to decompose into flammable gase s, so only secondary air is required to continue the combustion process.
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