| 摘要 |
PURPOSE:To obtain an apparatus preventing the leak of air through a packing by providing a projection wherein a tip touching to the packing of a filter frame is made to a convex shape in a filter receiver fixing the filter frame. CONSTITUTION:The clamping nuts 7 fixing a filter 1 and the filter frames 2 thereof are fitted so as to add the clamping force in the under direction via the filter pressers 6. The filter frames 2 and the filter receivers 4 are touched the convex parts of the projections 9 via the packings 3. Therefore since the clamping force is touched the tips of the convex parts of the projections 9, the clamping force is collectively added in the tip parts of the convex parts of the projections 9 and the packings 3 are sufficiently compressed. As a result, the leak of air due to the compression shortage of the packings 3 can be solved.
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