Flush Water Tank Device with Delay Valve Opening Mechanism
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Solution Overview
Problem
Existing flush water tank devices face challenges in obtaining a sufficient drive force to open the discharge valve with a delay after water ejection from the upper spout port, leading to inefficient toilet washing due to the need for a large float, which reduces the amount of retained flush water.
Innovation Solution
A flush water tank device incorporating a water pressure driving mechanism, a delay valve opening mechanism, and a balance float system that uses the buoyant force to overcome the hydraulic head pressure, allowing the discharge valve to open with a predetermined delay after water ejection from the upper spout port, ensuring effective toilet washing with reduced float size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a significantly large float is used to obtain sufficient drive force to pull up the discharge valve body, then the drive force is sufficient, but the amount of flush water that can be retained in the tank decreases
Solution Approach 1:
The float mechanism is segmented into two independent parts: a small float that generates buoyant force and a separate water receiving portion that accumulates flush water. This segmentation allows the float to remain small while still achieving sufficient drive force through the combined action of buoyancy and accumulated water weight.
Solution Approach 2:
A water receiving portion is introduced as an intermediary component between the float and the discharge valve body. This intermediary accumulates flush water and transmits the combined force of buoyancy and water weight to the discharge valve body through a connecting rod, enabling efficient force transmission without requiring a large float.
2Force
If a large float is used to overcome hydraulic head pressure, then the discharge valve can open with sufficient force, but the tank size for retaining flush water is reduced
Solution Approach 1:
The float mechanism is segmented into a small float and a separate water receiving portion. This allows the float itself to remain compact while the water receiving portion provides the additional mass needed to overcome hydraulic head pressure, thereby preserving tank volume for flush water retention.
Solution Approach 2:
The water receiving portion preliminarily accumulates flush water before the discharge valve opens. This preliminary accumulation of water weight, combined with buoyant force, ensures sufficient drive force is available when needed, without requiring a permanently large float that would reduce tank capacity.
3Speed
If the discharge valve opens immediately after water ejection from the upper spout port, then the response time is fast, but the washing effectiveness is reduced due to insufficient delay
Solution Approach 1:
The system performs preliminary water ejection from the upper spout port before opening the discharge valve. This preliminary action wets the toilet bowl surface, and the subsequent delay allows water to accumulate in the water receiving portion, ensuring the discharge valve opens at the optimal moment for effective washing while maintaining appropriate response timing.
Solution Approach 2:
The flushing process is divided into periodic stages: first, water ejects from the upper spout port to wet the surface; then, after a predetermined delay, the discharge valve opens to discharge retained flush water. This periodic action sequence ensures both timely response and effective washing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a sufficient drive force for the discharge valve to open with a delay, effectively washing the toilet while maintaining a smaller float size, thus optimizing the amount of retained flush water and improving washing efficiency.
Implementation Method 1
a balance float that is disposed to receive a buoyant force from the retained flush water
Implementation Method 2
when the weight of the water receiving portion increases and overcomes the buoyant force acting on the balance float
Data Source
AI summary
The present invention provides a flush water tank device (4), including: a flush water tank (10); a discharge valve (12) that causes the lower spout port to eject the flush water by switching between discharge and stopping of the flush water; a water pressure driving mechanism (14) that drives the discharge valve with a water supply pressure; a first on-off valve (19) that switches between water ejection and stopping of the flush water; a second on-off valve (18) that switches between water supply and stopping of the flush water to the water pressure driving mechanism; and a delay valve opening mechanism (21) that causes the second on-off valve to open with a delay of predetermined time after water ejection from the upper spout port is started, using a part of the flush water introduced via the first on-off valve, to supply the flush water to the water pressure driving mechanism.