Drain duct air suction device for flush toilet

摘要

Air suction device for a flush toilet configured to suction air from a toilet drain duct having a suction chamber dividing a tank body interior, a float in the suction chamber and an on-off valve closing an air inlet when the float lifts to prevent air flow from the toilet drain duct side into the suction chamber. The air inlet is higher than the water level in a toilet flushing standby mode. The on-off valve opens the air inlet to allow air flow form the drain duct side in the suction chamber when flush water in the tank drops such that the float is lowered form the raised position. An embodiment includes a valve chest, a float and attracting member for on-off valve manipulation. Another embodiment includes a valve chest with a small air flow manipulation hole.

主权项

1. An air suction device for use with a flush toilet that has a tank body for storing flush water used to flush a toilet body having a toilet bowl and a toilet drain duct communicating with a downstream side of the toilet bowl and a water supply device for supplying flush water into the tank body, the air suction device being configured to suction air from the toilet drain duct, the air suction device comprising:
a suction chamber formed as to divide an interior of the tank body and extending in an up-down direction and having a lower end that has an opening for communicating with an interior of the tank body; a float member disposed in the suction chamber and having a set buoyancy; an on-off valve that closes an air inlet when the float member is raised to a predetermined raised position, thereby preventing air flow from a toilet drain duct side into the suction chamber, the air inlet being located higher than a water level in a toilet flushing standby mode and configured for communication of air between the suction chamber and the toilet drain duct side, the on-off valve opening the air inlet to allow air to flow from the toilet drain duct side into the suction chamber when the flush water in the tank body outside the suction chamber drops to or below a set water level such that the float member is lowered from the raised position.