| 摘要 |
PROBLEM TO BE SOLVED: To provide a drain trap which can suppress the generation of negative pressure sucking air into the drain trap from an overflow pipe, without deteriorating a smooth flow of wastewater, and which can suppress an unusual noise generated because the air is sucked in. SOLUTION: This drain trap 1 includes: a drain pipe 8 which is connected to a drain outlet 4a positioned below a washbasin 4 and which guides wastewater flowing out from the drain outlet; a seal water chamber 10 which forms a channel for the wastewater from the drain pipe and which houses seal water capable of closing an outlet portion 8a of the drain pipe: an outflow pipe 14 which is connected to the seal water chamber so as to guide the wastewater, overflowing from the seal water chamber, to a sewerage side; and an overflow pipe 12, the outlet portion 12a of which is positioned on an upstream side with respect to the outflow pipe so as to guide the wastewater flowing out from an overflow port 4b positioned above the drain outlet of the washbasin. The outflow pipe is equipped with a channel-narrowed portion 14c which is formed in such a shape as to be narrowed further than the upstream-side channel 8b. COPYRIGHT: (C)2011,JPO&INPIT |
