Rim Spout Structure for Stable Flush Water Flow
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Solution Overview
Problem
Conventional flush toilets experience turbulence and splashing of flush water, leading to reduced visibility and cleanability of the water passageway downstream of the rim spouting port due to varying cross-sectional areas and increased overhang coverage.
Innovation Solution
A flush toilet design with a rim spout portion that maintains a constant cross-sectional area of the water passageway by increasing the height and decreasing the width downstream from the rim spout port, forming a stable circulating flow and preventing splashing, with a preferred ratio of the overhang portion's height to the shelf surface's height between 1:6 and 6:1, and a triangular-shaped rim spout port.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the height of the water passage cross section on the downstream side is set to increase with distance downstream, then the water passage can accommodate the circulating flow, but turbulence occurs and flush water splashes
Solution Approach 1:
The patent applies parameter changes by adjusting the width dimension of the water passage cross section to decrease with downstream distance, while the height increases, thereby maintaining a substantially constant cross-sectional area. This parameter optimization prevents turbulence and splashing by ensuring smooth water flow through the rim spout port.
2Stability of the object's composition
If the area of the overhang portion covering the water passageway is increased, then the structure provides better flow guidance, but visibility and cleanability of the water passageway deteriorate
Solution Approach 1:
The patent applies local quality by configuring the overhang portion with specific dimensional relationships - the height of the overhang portion is set to be 0.05 to 0.5 times the height of the water passage cross section. This localized optimization provides sufficient flow guidance while maintaining visibility and cleanability of the water passageway.
3Ease of manufacture
If the cross sectional area of the water passing cross section varies from the rim spout port toward the downstream side, then the passage can be formed structurally, but turbulence occurs in the rim spout water
Solution Approach 1:
The patent optimizes parameters by setting the water passage cross section with height increasing and width decreasing at downstream distances, maintaining a substantially constant cross-sectional area. This parameter configuration prevents turbulence while remaining structurally manufacturable.
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 design effectively suppresses turbulence, prevents splashing, and enhances visibility and cleanability by maintaining a stable flow within the bowl, improving flushing efficiency and user experience.
Implementation Method 1
the rim spout portion being configured to spout the flush water into the bowl so as to form a circulating flow
Implementation Method 2
the cross sectional area of the flow path cross section is approximately constant from the rim spout port toward the downstream side... turbulence suppressed
Data Source
AI summary
A flush toilet includes a bowl having a waste-receiving surface and a rim; on either the left or right side inside the front area of this bowl, a rim water passageway is formed and a rim spouting port is formed; the water passageway formed at the downstream side of this rim spouting port forms a flow path cross section with the inner circumferential surface of the rim, the shelf surface formed under this inner circumferential surface, and the overhang portion formed over the inner circumferential surface; the height dimension of the flow path cross section is set to increase with distance on the downstream side, and the width thereof is set to decrease with distance on the downstream side, so that from the rim spout port toward the downstream side, the cross sectional area of the flow path cross section is approximately constant.