Pressure-assisted flush water tank

A pressure-assisted flush water tank, comprising a fluid container, a Venturi nozzle, a baffle and a buoy;

• the fluid container having an accommodating chamber, a water channel and an air channel;
• the accommodating chamber having a fluid inlet, the water channel and the air channel being in communication with the fluid inlet;
• a restricting ring being provided on an inner wall of the air channel, an air inlet being defined in the restricting ring;
• the Venturi nozzle being disposed at a junction of the water channel and the fluid inlet;
• the baffle being axially fitted on an outer side of the air inlet for sealing the air inlet in a movable manner, wherein the baffle will not escape from the air channel;
• the buoy being disposed on an inner side of the air inlet, the buoy including a protruding post on a top end thereof;
• the protruding post being movably inserted in the air inlet and abutting against the baffle;
• wherein the buoy rises under internal pressure of the fluid container until the air inlet is closed, before the buoy closes the air inlet, the protruding post abuts against and lifts up the baffle to open the air inlet.