Flush Water Tank Segmented Geometry for Valve Stability
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Solution Overview
Problem
The existing flush water tank devices for toilets experience unstable operation of the discharge valve due to slow water level lowering, leading to inconsistent flushing performance and waste of water, as the discharge valve operation is not stable, causing variations in flush state and reduced efficiency.
Innovation Solution
A flush water tank device with a discharge valve that changes its lowering speed between predetermined water levels, with a slower speed from the full water level to the inflection water level and a faster speed from the inflection water level to the dead water level, ensuring stable valve operation and sufficient water discharge, featuring a larger horizontal cross-sectional area above the inflection water level and a sloped bottom surface to facilitate efficient water utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the water tank has a large bottom area to store sufficient flush water, then the water level lowers slowly during toilet flush, but the discharge valve operation becomes unstable and flushing performance varies
Solution Approach 1:
The water tank is divided into two distinct regions: an upper region with large horizontal cross-sectional area for storing sufficient flush water, and a lower region with small horizontal cross-sectional area near the discharge port. This segmentation allows the tank to maintain both adequate water storage capacity and stable discharge valve operation by controlling the water level lowering speed in different zones.
Solution Approach 2:
The horizontal cross-sectional area of the water tank is made non-uniform, being large in the upper portion and small in the lower portion near the discharge port. This local variation in geometry allows the tank to provide different water level lowering speeds in different regions, ensuring stable discharge valve operation while maintaining sufficient water storage.
2Quantity of substance
If the water level lowers slowly to maintain sufficient flush water, then the discharge valve has time to open properly, but the discharge valve operation becomes unstable and causes waste water
Solution Approach 1:
The water tank is segmented into upper and lower regions with different cross-sectional areas, allowing the system to provide both sufficient flush water storage and stable discharge valve operation, preventing waste water while ensuring adequate water availability.
Solution Approach 2:
The water tank geometry is pre-designed with a large upper region to store sufficient flush water before the discharge phase, ensuring that when the discharge valve opens, there is already adequate water available to prevent waste while maintaining stable operation.
3Loss of substance
If the discharge valve closes early due to slow water level lowering, then water is saved, but flushing performance is reduced
Solution Approach 1:
The water tank has a non-uniform horizontal cross-sectional area that is large in the upper portion and small in the lower portion. This local geometric variation ensures that the water level lowers slowly in the upper region (allowing adequate water storage) but faster near the discharge port (ensuring timely valve closure), optimizing both water conservation and flushing performance.
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
This configuration stabilizes the discharge valve operation, reduces variations in flushing performance, and ensures a sufficient amount of water is discharged efficiently, maintaining consistent flushing performance by adjusting the water level lowering speed and utilizing space effectively.
Implementation Method 1
the lowering speed of the water level between the inflection water level and the dead water level is faster than the lowering speed of the water level between the full water level and the inflection water level
Data Source
AI summary
The present invention is a flush water tank device including a flush water tank main body, a water supply valve, and a discharge valve, in which during a flush of the flush toilet, the discharge valve is opened until a water level in the flush water tank main body is lowered from a predetermined full water level to a predetermined dead water level, a lowering speed of the water level in the flush water tank main body changes at a predetermined inflection water level between the full water level and the dead water level, and the lowering speed of the water level between the inflection water level and the dead water level is faster than the lowering speed of the water level between the full water level and the inflection water level.