Patent ID: 8544123

Claim:
A flush toilet cleaned by pressurized flush water, said flush toilet comprising: a toilet main unit provided with a bowl portion, a rim water spouting port and jet water spouting port both for expelling flush water, and a drain trap pipe; a reservoir tank for storing flush water; rim spout water supply means for supplying flush water to the rim water spouting port at a predetermined timing; reservoir water supply means for supplying flush water to the reservoir tank at a predetermined timing; a pressurizing pump for pressurizing flush water stored in the reservoir tank and supplying the flush water to the jet water spouting port; and control means for controlling the operation of the pressurizing pump and the rpm thereof so as to control the flow speed and the flow volume of flush water spouted from the jet water spouting port; wherein the drain trap pipe includes an inlet portion, a trap ascending pipe rising from the inlet portion, and a trap descending pipe dropping from the trap ascending pipe; the jet water spouting port is disposed approximately horizontally, pointing toward the inlet portion of the drain trap pipe; and the control means controls the rpm of the pressurizing pump so that a first flow volume, configured to generate a first siphon action, is spouted from the jet water spouting port, and then a second flow volume, configured to generate a second siphon action which is weaker than the first siphon action, is spouted from the jet water spouting port continuously after the first flow volume being spouted, so as to generate a flow speed capable of conveying waste and to seal a cross section at some location of the drain trap pipe, prior to the end of the first siphon action generated by the first flow volume, thereby continuing the siphon action when the first flow volume and the second flow volume have been spouted.