| 摘要 |
The elongated generally tubular shell of an oil burning portable heater is provided with a coaxial combustion chamber at its front end portion. A motor within a rear end portion of the shell drives both a primary combustion air pump and a fan for drawing air into the rear end of the shell and forcing it longitudinally through the shell. A burner tube extends a short distance into the rear end of the combustion chamber and a burner head is mounted at the rear end of the burner tube. A fuel nozzle in the burner head is supplied with oil and primary air and projects an air-oil mixture axially of the burner tube. Auxiliary air from the fan enters openings in the circumference of the burner head and exits into the burner tube in a swirling pattern. An open ended conical flame retention head is located within the burner tube with the small end of the cone facing the nozzle to receive the air-oil mixture projected therefrom, and auxiliary air openings in the flame retention head have outwardly protruding vanes adjacent their margins for guiding auxiliary air into the flame retention head and imparting a swirl thereto in the same rotational direction as that provided when the auxiliary air enters the burner head.
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