| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an automatic back washing blower capable of simply changing over an air supply amt. at a time of usual aeration and that at a time of back washing aeration. SOLUTION: A controller 13 controls the operation of a plurality of compressors 1, 2 and that of a three-way solenoid valve 5 and provides, for example three operation patterns (1-3). In the operation parttern (1), the compressors 1, 2 are operated so as to be changed over at every timing performing back washing and, when backwashing is changed over, the compressors 1, 2 are overlapped in operation. In the operation pattern (2), a plurality of the compressors are parallelly operated and, at every timing performing back washing, the compressors are alternately stopped during a back washing period so that back washing changeover timing and the stop timing of the compressors do not coincide with each other. In the operation pattern (3), the compressors are always operated parallelly and, when back washing timing arrives, the three-way solenoid valve 5 is operated for a back washing time and a changeover valve 4 is changed over to a back washing aeration side.</p> |
