| 摘要 |
A flushing mechanism (100) comprises a tank body (1) with a water outlet arranged about an axis on the bottom thereof, a guide bar axially fixed with respect to the tank body (1) along the axis, a first piston (4) sealed at the same time against a cylindrical inner surface and the guide bar along the direction of the axis, a first piston loading spring (5) fitted in an upper chamber around the guide bar, a second piston (8) hermetically sliding on the guide bar along the direction of the axis and being located between the first piston (4) and the bottom of the tank body, a second piston loading spring (9) fitted around the guide bar, and a control valve (15); wherein an annular projection (4-5) provided at the lower end of the first piston (4) is able to press a large seal ring (8-3) of a sealing assembly for the second piston into a pre-pressed bent deformation while the first piston (4) is sliding downwards, thus the large seal ring (8-3) of the sealing assembly for the second piston performs the sealing prior to a small ring (8-4) thereof due to the pre-pressed bent deformation, such that the water inside an outer annular lower chamber (8-5) can be discharged from the water outlet smoothly. |
