| 摘要 |
Basically the present invention in it's most simple form or embodiment is directed to a controlled labyrinth heat exchanging oil nozzle assembly for use as a flame producing nozzle within an oil burning heating system, particularly adapted to burning of waste oil. The nozzle assembly comprises a block, the temperature of which is controlled or controllable and in which there is at least one cylindrical bore (preferably two bores are provided) into which director plugs are specially inserted. The block, the bore or bores and the flow director plug or plugs are designed to provide a fuel flow passage which undulates upward and downward thereby increases the dwell time or the time during which fuel is within the block and also creating substantial surface area through which heat is transferred or transferable from the block when it is heated to the fuel flowing in such an undulating manner therethrough. There is also provided an air passage within the block and which provides air at appropriate pressure to an air atomizing flame producing nozzle. The air is also heated by the block so that the air is at an appropriate and desirable temperature when it mixes with the fuel at the nozzle. All of these features are achieved along with providing for total and easy access to virtually all of the primary heat exchange surfaces and the surfaces of the fuel passage for the purpose of inspection and thorough cleaning without the necessity of taking the assembly "off line".
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