| 摘要 |
PROBLEM TO BE SOLVED: To make collectable foreign substances of various sizes mixed in a fluid over the whole filter medium. SOLUTION: The outside size of a filter medium 20 before being housed in a housing part 16 formed in a filter case 10 is set up to be appropriately larger than the inside volume of the housing part 16. The filter medium 20 is compressed to be housed in the housing part 16 so that a compression section 30 where the catching rate of the foreign substances is increased is formed in an optional section of the filter medium. In this way, the foreign substances having different sizes can be caught by the whole the whole filter medium 20. The dimensional difference between the filter medium 20 and the housing part 16 is set up to be larger on the side of a discharge opening 14 than on the side of an introduction port 12, and the degree of compression of the compression section 30 is larger on the side of the discharge opening 14 than on the side of the introduction port 12. COPYRIGHT: (C)2004,JPO
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