Trap for drainage and piping system using the same

摘要

A trap for a drainpipe and a piping structure using the trap are provided to maximize the effect of exhausting noxious gas by having an air exhaust pipe connected to a vent pipe and to prevent the counterflow of noxious gas by exhausting noxious gas completely not to remain in a drainpipe, and a piping structure using the trap for a drainpipe is provided to discharge sewage and general drainage all together. A trap for a drainpipe contains: an inlet(10) connected with an inflow pipe(I) using a locking nut(N) and a male screw thread(S); an air exhaust pipe(20) diverged upward from an inlet or a sealing pipe upward to connect with a sealing pipe and functioning as an exhaust passage of noxious gas; a sealing pipe(30) connected downward from the inlet to have the fixed sealing depth, functioning as a drainage passage and cutting off the counterflow of noxious gas; an outlet(40) diverged downward from the bottom of the sealing pipe, located below than the inlet and connected with an exhaust pipe(E); and a vent(50) diverged upward from the top of the sealing pipe, joined to the outlet and connected with the air exhaust pipe and a vent pipe(A) using a locking nut and a male screw thread. A piping structure is formed by installing a trap for a drainpipe among an inflow pipe, an exhaust pipe and a vent pipe to discharge drainage without the counterflow of noxious gas by laying a drainpipe and a vent pipe only without laying a sewer pipe.