Toilet flushing device and flush toilet

Abstract

Providing a toilet flushing device and a flush toilet both of which can desirably execute toilet flushing. A toilet flushing device (20) includes a first tank (21) storing flush water, a second tank (22) having a lower opening (22C) communicating with the first tank (21) and having a lower region (22D) and an upper region (22U) with a larger capacity per unit height than the lower region (22D), an air passage (23) communicating between the second tank (22) and a toilet drainage (12) via a position located higher than a maximum storage water level (L) in the first tank (21), a water-supply passage (24) communicating between the first tank (21) and a toilet bowl (11) and a on-off valve (25) which maximizes a flow rate of an air in the air passage (23) with a delay to initiation of supply of flush water stored in the first tank (21) through the water-supply passage (24) into the toilet bowl (11), the air flowing from the toilet drainage (12) side to the second tank (22) side.

Description

TECHNICAL FIELD[0001]The present invention relates to a toilet flushing device and a flush toilet.BACKGROUND ART[0002]Patent Document 1 discloses a conventional flush toilet provided with a toilet body and a toilet flushing device. In this flush toilet, the toilet flushing device supplies flush water to the toilet body to execute toilet flushing. The toilet body has a toilet bowl and a toilet drainage communicating with a downstream side of the toilet bowl. The toilet flushing device has a tank, a hollow pipe, an exhaust passage and a water-supply path. The tank is provided for storing flush water to be supplied to the toilet body. The hollow pipe is accommodated in the tank so as to extend vertically and has a lower end which is open in the tank. The exhaust passage communicates between an upper end of the hollow pipe and the toilet drainage of the toilet body through a location located higher than a maximum storage water level in the tank. The water-supply path communicates betwee...

AI Technical Summary

Benefits of technology

The third invention provides a toilet flushing device that can effectively flush toilets and a flush toilet that includes the device. The device can be placed below the toilet surface, allowing for flexibility in installation and efficient flushing.

Problems solved by technology

As a result, there is a possibility that the hollow pipe cannot desirably suck air in the toilet drainage for occurrence and continuation of siphon effect in the toilet drainage.

Furthermore, the negative force in the toilet drainage is rendered stronger than the suction power of the hollow pipe after occurrence of the siphon effect in the toilet drainage, whereupon there is a possibility that air would flow back into the toilet drainage with the result of early termination of siphon effect.

Accordingly, there is a possibility that the flush toilet of Patent Document 1 cannot desirably discharge sewage or the like in the toilet bowl by execution of toilet flushing.

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