| 摘要 |
PURPOSE:To indicate abnormality in the flow rate of cooling air before a device to be cooled reaches an abnormal temperature by detecting the flow rate of the air for cooling said device provided in a cooker and by issuing a warning in the case where the flow rate is below a specified value. CONSTITUTION:A cooling air flow rate is detected as an AC voltage signal Sa of a generator 16 connected to a fan 17. Said AC voltage signal Sa is converted into a DC voltage signal Va via a rectifier circuit 22, is amplified with a transistor 25, and is outputted as an amplified signal Vb. A reference voltage Vo corresponding to an air flow rate of an extent which does not cause damage to an electric device provided in a cooker is set. The amplified signal Vo is compared with the reference voltage Vo at a comparator 31. In the case the air flow is insufficient, an abnormality indicator lamp 35 is lit to inform an operator of the lack of the cooling air flow rate. |
