| 摘要 |
A blower 48 introduces heated vapour to the microwave oven chamber 12 through a microwave screen 16 which prevents microwave energy entering the region where the vapour is heated. The blower 48 draws vapour out of chamber 12 through an apertured microwave screen 18 where it is oxidized by the combustion products of a gas burner 60 before being reintroduced to the chamber 12 through the screened inlet 16. Some of the vapour bleeds off through a vent 52 with cooling air blown by a blower 54. The burner operates in a slight negative pressure and burns air rich. <IMAGE> |
