| 摘要 |
PROBLEM TO BE SOLVED: To hold an air flow, obtained by a blower, approximately at a specified value even when slight choking occurs in an air filter. SOLUTION: In an air supply unit comprising an airflow variable type blower 2; and an air filter 3 to remove dust contained in an air flow W sucked through the blower 2, a degree of choking detecting means to detect the degree of choking of the air filter 3 and an airflow control means to control an airflow of the blower 2 in correspondence with the degree of choking detected by the degree of choking detecting means are annexed. An airflow of the blower 2 is controlled in correspondence to the degree of choking (in other words, the increase of draft resistance a pressure loss) of the air filter 3. |
