Stored Nozzle Flow Path Layout to Suppress Bidet Dripping
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Solution Overview
Problem
Existing sanitary washing devices experience water dripping from the water discharge port due to the nozzle's design, which can lead to inefficiencies and potential contamination.
Innovation Solution
The sanitary washing device positions the water discharge port higher than the inlet when the nozzle is in the stored state, incorporates an upwardly convex flow channel with specific inclinations, and includes a body wash flow channel with distinct curvatures to suppress water dripping and disperse load on the drive motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the nozzle is designed with the water discharge port at a lower position, then water can be discharged effectively during washing, but water drips from the discharge port when the nozzle is in the stored state
Solution Approach 1:
The patent inverts the conventional nozzle design by positioning the water discharge port higher than the inlet of the flow channel switch valve in the stored state. This inversion prevents water from flowing out of the discharge port when the system is not in use, as water naturally flows downward due to gravity. During actual washing operation, the nozzle advances and the discharge port moves to an appropriate position for effective water discharge.
2Ease of manufacture
If the flow channel is designed with a simple linear structure, then manufacturing is easier, but water may remain in the channel causing dripping
Solution Approach 1:
The patent designs the flow channel with a specific curved structure including an upwardly convex portion and inclined portions. This curved configuration allows water to drain completely toward the discharge port due to gravity, preventing water accumulation in dead zones. The channel includes a first inclined portion descending frontward from the top, and a second inclined portion descending backward, ensuring complete water drainage while maintaining manufacturability.
3Reliability
If the nozzle unit is retracted into the casing, then it is protected when not in use, but water may drip from the stored nozzle
Solution Approach 1:
The patent applies the inversion principle to the vertical positioning of components within the retracted nozzle. By making the discharge port higher than the inlet valve in the stored retracted position, the design exploits gravity to prevent water accumulation and dripping during storage, while still allowing effective washing when the nozzle advances.
Solution Approach 2:
The curved flow channel design ensures that when the nozzle is retracted into the casing for protection, any water in the channel naturally drains toward the higher discharge port due to the upwardly convex configuration, preventing water retention and subsequent dripping from the protected stored nozzle.
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 design effectively minimizes water dripping from the nozzle and disperses load on the drive motor, enhancing operational efficiency and hygiene.
Implementation Method 1
the water discharge port is positioned higher than an inlet of the flow channel switch valve when the washing nozzle is in a stored state
Data Source
AI summary
A sanitary washing device includes a casing and a nozzle unit configured to advance and retreat between the casing and a toilet. The nozzle unit includes a washing nozzle and a flow channel switch valve. The washing nozzle includes a water discharge port configured to discharge water toward a human body private part, and a flow channel configured to supply water to the water discharge port. The flow channel switch valve is configured to switch the flow channel between flow-enabled and shutoff. The water discharge port is positioned higher than an inlet of the flow channel switch valve when the washing nozzle is stored in a stored state.