The invention discloses a water drainage and
toilet flushing
system with a U-shaped
pipe set and
sight glass, and belongs to the technical field of environment-friendly
water treatment. The U-shaped
pipe set comprises a three-way four-way joint, a 90-degree
elbow, a gas blocking plate, a view lens, a 45-degree
elbow and a short
pipe; the technical defects that in the prior art, a P-shaped pipeline trap of a cross-layer drainage
toilet flushing
system is small in water seal volume, difficult in increment and prone to
pollution are overcome, and the technical scheme that the U-shaped pipe set is arranged, and the P-shaped pipeline trap is omitted is provided; a longitudinal water seal is horizontally hoisted by the U-shaped pipe set, the volume is doubled, and
water storage and excrement storage are carried out fully; the U-shaped pipe set is a primary large water seal
assembly and is horizontally connected with an indoor and outdoor drainage main pipe to serve as a protection barrier for drainage and
odor isolation of the
system, secondary water seal of each indoor sanitary appliance synchronously reduces load and configuration cost, stored excrement of the U-shaped pipe set is flushed away through cross-layer drainage, therefore the common problem that a kitchen and bath drainage system pollutes the interior of a room is eradicated with low manufacturing cost, and the
sight glass is arranged to provide accurate operation.