PURPOSE: To prevent counterflow into crosswise branch pipe, facilitate formation of a draft core in riser pipe, and enhance the water discharge performance by furnishing inclining ridges in the inflowing side riser pipe which joins the upper part of an enlarged part concentrically, inserting this riser pipe into an upper crosswise branch pipe to a position near the center of a horizontally directed pipe, and furnishing a ridge also in the lower outflowing side riser pipe in connection with the enlarged lower reducing part.
CONSTITUTION: An inflowing side riser pipe 4 is concentrically connected with the upper part of an enlarged part 1 where an upper crosswise branch pipe 2 and a lower crosswise branch pipe 3 are in connection and is inserted to a position near the center of the crosswise branch pipe 2. Two inclining ridges 5 to give a swirl to the exhaust water in the inflowing side riser pipe 4 are provided opposingly. Also an inclining ridge 5 is furnished in an outflowing side riser pipe 7 connected with the bottom of a lower reducing part 6. Even though the discharge water diffuses into the enlarged part 1, it does not commit counterflow into the branch pipe 2, but assumes a natural downflow at the level of the crosswise pipe 3, and does not either commit intrusion into the crosswise pipe 3. Thereby double swirling forces are given to the discharged water, which should facilitate formation of a draft core inside of the riser pipe and enhance the water discharging performance.
YABE YASUO
FUSE KENJI
MATSUO TOMOHIRO
SUGAWARA KEISUKE
SHIBATA TSUNEYOSHI
YOSHIDA YOSHIKAZU
