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

[0038]The third tank is provided with the inlet so that flush water can flow from a lower part of the first tank into the third tank. Accordingly, air is not allowed to flow from the first tank through the inlet into the third tank until the water level of the flush water in the first tank drops below the inlet of the third tank. Consequently, the third tank can be kept full of flush water by the influence of pressure of flush water in the first tank. In other words, almost all the flush water in the first tank can be caused to flow into the third tank. The flush water having flowed in the third tank can be supplied through the water-supply passage into the toilet body by the let pump. Consequently, the toilet flushing device can supply flush water to the toilet body at a high flout rate. Thus, the toilet flushing device can use almost all the flush water stored in the first and third tanks and can desirably execute toilet flushing.

[0039]Furthermore, although the jet pump is disposed in an upper interior of the third tank, since the third tank can be kept full of flush water until almost all the flush water in the first tank flews into the third tank, the jet pump can draw the flush water in the third tank in the interim with the result that flush water can be supplied to the water-supply passage.

[0040]Further

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 i

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