| 摘要 |
PROBLEM TO BE SOLVED: To provide a strainer which facilitates back washing of whole of a filter element, permits continuous filtration operation and is capable of performing the manufacturing assembly by using low-cost constitutional components. SOLUTION: A medium filtration passage 21 formed in a container 25 is divided into an upstream side passage 21a and a downstream side passage 21b across the filter element 26, an opening/closing switching valve 27 is disposed on an inlet pipe 23 of the upstream side passage 21a and an opening/closing blow valve 29 is disposed on a blow pipe 28 for discharging material to be filtered of the same upstream side passage 21a. The medium filtration passage 21 and a medium filtration passage 22 having the similar structure are communicated with common medium supply pipe 31 and medium collection pipe 32 in parallel, medium is allowed to flow backward from the downstream side passage 21b to the upstream side passage 21a by selectively closing one side switching valve 27 and opening the blow valve 29 and, thereby, the filter element 26 is subjected to back washing. COPYRIGHT: (C)2006,JPO&NCIPI
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