Pulsating Wash Nozzle Control for Uniform Jet Density
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Solution Overview
Problem
Conventional sanitary washing apparatuses using natural aspiration for mixing air with wash water result in irregular water jet density, leading to uncomfortable and intermittent feelings during washing due to non-uniform water hitting the anus and private parts.
Innovation Solution
A sanitary washing apparatus with a nozzle that pulsates water to alternate between two densities and areas of impact, using a flowing water adjuster to ensure consistent and intense pungent and enough feelings with reduced water usage, incorporating an air mixer to vary air content at pulsation peaks, and a pulsating unit to maintain pressure and amplitude control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If natural aspiration is used to mix air with wash water, then water jet density varies irregularly, but device complexity is reduced
Solution Approach 1:
The patent applies periodic action by using a pulsating water supply system that cyclically varies water pressure and flow rate. The water jet alternates between high-density phases (for pungent feeling) and low-density phases (for enough feeling), creating regular periodic patterns in the water jet characteristics. This resolves the uniformity issue by replacing irregular natural aspiration with controlled periodic pulsation.
Solution Approach 2:
The patent changes physical parameters of the water jet by controlling pressure and air mixing ratios dynamically. The system varies water pressure between predetermined maximum and minimum values, and adjusts air mixing ratio between first and second ratios, creating distinct high-density and low-density phases. This parameter control ensures uniform alternation between different water jet densities.
2Area of stationary object
If more water is used to improve coverage area, then enough feeling is enhanced, but water consumption increases
Solution Approach 1:
The system uses periodic pulsation to alternate between concentrated high-pressure jets (for pungent feeling with minimal water) and expanded lower-pressure jets (for coverage area). This time-division multiplexing allows both sufficient coverage and low water consumption by switching between different jet modes rather than continuously using high water flow.
Solution Approach 2:
The patent changes water pressure and air mixing ratio parameters to achieve different jet characteristics. During high-pressure phases, water is delivered with high concentration for intense localized effect. During low-pressure phases, water expands to cover larger area with less intensity. This parameter variation allows achieving both coverage and water efficiency.
3Force
If water pressure is increased to enhance pungent feeling, then jet intensity improves, but risk of water balls forming increases
Solution Approach 1:
The system applies periodic pulsation with controlled amplitude to deliver high-pressure jets for pungent feeling while allowing sufficient expansion time between pulses. The regular cycling between high and low pressure prevents water accumulation that would form large water balls, as each high-pressure pulse is followed by a low-pressure expansion phase.
Solution Approach 2:
The patent carefully controls the amplitude of pressure pulsation within specific ranges. The maximum pressure is sufficient to create intense jets for pungent feeling, but the amplitude is limited to prevent excessive water accumulation. Additionally, air mixing ratio is adjusted to control water jet fragmentation and prevent large water ball formation.
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 apparatus provides a comfortable wash feeling by alternately producing pungent and enough sensations at regular intervals, reducing uncomfortable and intermittent feelings while using less water, and preventing the formation of large water balls that could cause intermittent sensations.
Implementation Method 1
a pulsating unit that cyclically changes pressure of water to be fed to the jetting water outlet
Implementation Method 2
an air mixer that mixes air with water fed to the jetting water outlet; varying the amount of air mixed with water fed to the jetting water outlet in synchronization with pulsation of the water
Implementation Method 3
a nozzle that jets water to an anus and the private parts of a user from a jetting water outlet
Data Source
AI summary
A sanitary washing apparatus includes a nozzle having jetting water outlets from which water that pulsates by cyclically changing pressure jets, and a pump and a controller that functions as a flowing water adjuster that adjusts flowing water fed to the jetting water outlets in such a manner that first jetting water and second jetting water alternately occur at peaks of the pulsation of the water. With such an arrangement the first jetting water hits an anus and the private parts of a human body in a smaller area with a higher density than the second jetting water, and the second jetting water hits the anus and the private parts in a larger area with a lower density than the first jetting water.