Sanitary Washing Device Foam Nozzle Dirt Adhesion
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Solution Overview
Problem
Conventional sanitary washing devices do not effectively prevent dirt from adhering to the cleaning water nozzle, requiring periodic manual brushing to maintain cleanliness.
Innovation Solution
A sanitary washing device equipped with a foam generation unit that discharges cleaning foam onto the cleaning water nozzle, using a spray nozzle driven by a spray nozzle drive unit to prevent dirt adhesion, along with a control unit to manage the cleaning process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If water or hot water from a heat exchanger is used as cleaning water for washing dirt from the cleaning water nozzle, then the cleaning water nozzle can be washed, but residual dirt still adheres and deposits on the cleaning water nozzle requiring periodic manual brushing
Solution Approach 1:
The patent changes the physical state of the cleaning medium from liquid water to foam. The foam generation unit converts water into foam by incorporating air, creating a different physical form that adheres better to the cleaning water nozzle surface. This parameter change (from liquid to foam) enables more effective dirt removal without residual adhesion, solving the reliability issue while maintaining automatic operation.
Solution Approach 2:
The patent introduces foam as an intermediary medium between the cleaning water nozzle and the dirt. The foam generation unit creates foam that acts as a mediator to carry cleaning agents and water to the nozzle surface more effectively than liquid water alone. This intermediary foam structure prevents direct contact between liquid water and the nozzle surface that causes residual dirt adhesion, while still enabling automatic cleaning.
2Reliability
If a spray nozzle is added to discharge cleaning foam onto the cleaning water nozzle, then dirt adhesion is prevented, but the device complexity increases
Solution Approach 1:
The patent merges the spray nozzle function with the existing cleaning water nozzle structure. The spray nozzle is integrated into the cleaning water nozzle assembly, allowing it to discharge cleaning foam directly onto the cleaning water nozzle during the cleaning operation. This merging approach prevents dirt adhesion while minimizing the increase in device complexity by combining functions rather than adding completely separate components.
Solution Approach 2:
The spray nozzle is designed to serve multiple functions: it discharges cleaning foam onto the cleaning water nozzle for automatic cleaning, and can also discharge cleaning water for other cleaning purposes. This multi-functionality reduces the overall device complexity by making the spray nozzle a versatile component that performs several operations rather than requiring separate dedicated components for each function.
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 device effectively prevents dirt from adhering to the cleaning water nozzle, reducing the need for manual cleaning and maintaining nozzle hygiene.
Implementation Method 1
a foam generation unit for generating cleaning foam
Implementation Method 2
a heat exchanger for heating cleaning water
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A sanitary washing device includes heat exchanger (700), cleaning water nozzle (831), cleaning water nozzle drive unit (860), foam generation unit (560) for generating a cleaning foam, spray nozzle (550) for discharging a cleaning water or cleaning foam into a toilet bowl. The sanitary washing device further includes discharge water amount variable unit (516) for variably changing a flow rate of the cleaning water or the cleaning foam, spray nozzle drive unit (550) for driving a discharge opening of spray nozzle (550) in a predetermined direction, opening and closing valve (530a) for opening and closing branch passage (530) to spray nozzle (550), a control unit, and an operation unit. The control unit performs control to discharge the cleaning foam from spray nozzle (550) to a surface of cleaning water nozzle (831). As a result, the sanitary washing device capable of preventing adhesion of dirt to cleaning water nozzle (831) with cleaning foam can be provided.