| 摘要 |
PROBLEM TO BE SOLVED: To form a strainer by laminating circular ring bodies at prescribed intervals without using a spacer constituted of a plate-shaped ring body. SOLUTION: The strainer 72 is formed by laminating circular ring bodies at prescribed intervals and disposed in a housing part 26 of a case 24. A scraper 20 having a plate-shaped projecting piece 22 penetrating each gap between the adjacent circular ring bodies is used for scraping the solids 16 adhered to the strainer 72. The strainer 72 has a pair of end circular ring bodies 74 on both end sides, plural intermediate circular ring bodies 78a, 78b, which are disposed between the ring bodies 74 and each of which has projecting pieces 76 extending inside on the inner periphery surface, and plural horizontally bridging members 82 each of which is hung between the ring bodies 74 and fit to the ring bodies 74 and has plural engaging parts 80 formed on the surface at prescribed intervals for holding each of the ring bodies 78a, 78b by engaging with the projecting piece 76.
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