PURPOSE: To decrease the nonuniformity in the flow of fluid with practically no decrease in the strength of a perforated plate by installing said plate by directing the end face where the sectional area of the holes having different sectional areas along the thickness direction is max. to the packing side.
CONSTITUTION: Since a perforated plate consists of holes having the sectional areas differing along the thickness direction, the strength for supporting the packing is maintained roughly by the numerical aperture in the part where the area of the holes is smallest and therefore the perforated plate is strong. The perforated plate is installed by directing the end face where the sectional area of the holes is max. to the packing side, whereby smooth flow is assured for the flow of the fluid flowing out to the packing side or flowing into from the packing side; therefore, the nonuniformity in the flow is minimized. A preferred form of the perforated plate is the perforated plate with each hole having a shape such as a circular truncated cone shape or the like wherein the symmetrical axis of rotation of said hole coincides with the flow of the fluid and ≥0.6 numerical aperture of the end face where the sectional area of the holes is max.
FUKUDA HIDEO
SAITOU SHIN
| JPS54135665A | 1979-10-22 |