Washdown Toilet Trap Conduit with Variable Cross-Section for Waste Climbing
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Solution Overview
Problem
Washdown flush toilets face reduced waste discharging performance when the amount of flush water is minimized, as the water level difference necessary for effective waste removal is not sufficient, leading to inefficient waste disposal.
Innovation Solution
The design of the water discharge trap conduit includes an enlarged section with a larger cross-sectional area downstream and a shrunk section with a smaller cross-sectional area upstream in the ascending flow channel, promoting waste separation and collection, and providing rotational force to aid waste climbing, while maintaining efficient flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the amount of flush water is reduced to improve water saving performance, then water consumption is reduced, but the water level difference is reduced leading to deteriorated waste discharging performance
Solution Approach 1:
The trap ascending pipe part is designed with non-uniform cross-sectional area, creating different flow characteristics in different sections. The enlarged part provides space for waste separation while the shrunk part creates velocity increase for effective waste climbing, allowing efficient waste removal with reduced water volume
Solution Approach 2:
The cross-sectional area parameter of the trap ascending pipe part is changed along the flow direction, with an enlarged section followed by a shrunk section. This parameter variation creates the necessary flow conditions for waste separation and climbing without requiring large amounts of flush water
2Device complexity
If a conventional trap ascending pipe part with constant cross section area is used, then the structure is simple, but waste cannot climb up effectively when flush water amount is reduced and may return to inlet pipe part
Solution Approach 1:
Instead of a uniform structure, the trap ascending pipe part incorporates localized variations in cross-sectional area. The enlarged part provides a separation zone while the shrunk part creates a velocity increase zone, ensuring reliable waste climbing even with reduced flush water
Solution Approach 2:
The cross-sectional area of the trap ascending pipe part varies dynamically along the flow direction, creating changing flow conditions that promote waste separation in the enlarged section and waste climbing in the shrunk section, improving reliability over static constant-area designs
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 enhances waste discharging performance even with a smaller amount of flush water, ensuring effective waste removal and preventing siphon phenomena in the descending flow channel.
Implementation Method 1
a portion on a downstream side of the ascending flow channel is provided with an enlarged part 32 which has a cross section area larger than that on an upstream side of the ascending flow channel
Implementation Method 2
a downstream end of the ascending flow channel and/or an upstream side of the descending flow channel is provided with a shrunk part 36 which has a cross section area smaller than that on an upstream side of the ascending flow channel
Data Source
AI summary
In a washdown flush toilet, a water discharge trap conduit includes: an inlet pipe part connected to a bowl part receiving waste; a trap ascending pipe part connected to the inlet pipe part and forming an ascending flow channel; and a trap descending pipe part connected to the trap ascending pipe part and forming a descending flow channel. With regard to a cross section perpendicular to a flow direction of the ascending flow channel, a portion on a downstream side of the ascending flow channel is provided with an enlarged part having a cross section area larger than that on an upstream side of the ascending flow channel. A downstream end of the ascending flow channel and/or an upstream side of the descending flow channel is provided with a shrunk part having a cross section area smaller than that on the upstream side of the ascending flow channel.