| 摘要 |
A pulse combustion heater includes a combustion chamber (218) and at least one exhaust pipe (110) forming a resonant system with the chamber. In one aspect of the invention, the combustion chamber has an internal cavity of flattened spherical shape and the exhaust pipe debouches tangentialiy into it on its median plane, which causes combustion gases returning to the combustion chamber to flow into said cavity in a double toroidal flow pattern. The fuel mixture entry into the chamber is at one end so that it enters along the axis of the double toroid. In another aspect, the primary exhaust pipe (110) which is of a length selected so that combustion of gases is at least substantially complete before the gases leave the pipe. The pipe (110) terminates at a manifold (146) to which is connected a plurality of heat exchange coils (154) of helical shape from which heat is transferred to a fluid circulated around the coils. According to another aspect of the invention, the heater has a three part housing, upper (226) and lower (230) parts of which are concrete castings and define respectively an air cushion chamber (204) and an exhaust chamber (210) of the heater. A centre selection (228) forms part of a boiler sub-assembly which isolates the exhaust chamber from the air cushion chamber. In another aspect, a unitary gas cushion chamber sub-assembly (214) is described. |
