Sanitary washing device
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Solution Overview
Problem
Sanitary washing devices face issues with unintentional jetting of high-temperature water due to failures in heating or temperature sensing components, which can cause discomfort or scalding, despite the presence of protective electronic circuits.
Innovation Solution
The device incorporates a dual temperature sensing system with a first temperature sensor upstream and a second sensor downstream of the heating part, along with a controlling part that determines abnormality based on temperature changes, allowing for proactive prevention of high-temperature water jetting by prohibiting water supply to the nozzle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single temperature sensor is used to control water heating, then the device complexity is low, but the reliability of preventing high-temperature water jetting is insufficient due to potential sensor failures
Solution Approach 1:
The temperature sensing function is segmented into two independent sensors: a first temperature sensor for normal temperature control and a second temperature sensor for safety monitoring. This segmentation allows the system to detect sensor failures by comparing readings from both sensors, thereby improving reliability without requiring complex failure detection mechanisms.
Solution Approach 2:
The second temperature sensor is positioned downstream of the heating part to detect temperature in advance before water reaches the nozzle. This preliminary detection enables the control unit to stop heating or close the flow channel before high-temperature water can be jetted, preventing scalding incidents proactively.
2Object-affected harmful factors
If temperature monitoring is enhanced with multiple sensors, then the safety against high-temperature water jetting improves, but the device complexity increases
Solution Approach 1:
The control unit continuously monitors temperature readings from both the first and second temperature sensors, comparing them to detect abnormalities. When a discrepancy exceeds a predetermined threshold or the second sensor detects high temperature, the system provides feedback to stop heating or close the flow channel, preventing high-temperature water jetting while maintaining manageable system complexity through logic-based monitoring.
3Productivity
If the heating part operates at high temperature for efficiency, then the productivity of water heating improves, but the risk of scalding increases due to potential failures
Solution Approach 1:
The second temperature sensor is positioned downstream of the heating part to detect temperature in advance before water reaches the nozzle. This preliminary detection enables the control unit to stop heating or close the flow channel before high-temperature water can be jetted, preventing scalding incidents proactively.
Solution Approach 2:
The system incorporates a protective electronic circuit with dual temperature sensors that detects potential failures before they cause harm. By monitoring temperature discrepancies between the two sensors, the system prepares to stop heating or close the flow channel in advance, cushioning against the harmful effects of potential sensor failures during high-temperature operation.
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 solution effectively reduces the risk of high-temperature water jetting, enhancing user safety by reliably detecting sensor abnormalities and preventing excessive water temperature from reaching the user.
Implementation Method 1
a first temperature sensor configured to sense temperature of water heated by the heating part
Implementation Method 2
a second temperature sensor provided downstream of the first temperature sensor and configured to sense temperature of the water
Implementation Method 3
a heating part
Data Source
AI summary
A sanitary washing device according to an embodiment comprises: a heating part; a first temperature sensor configured to sense temperature of water heated by the heating part; a second temperature sensor provided downstream of the first temperature sensor and configured to sense temperature of the water; a nozzle provided downstream of the second temperature sensor and configured to jet the water toward human private parts; and a controlling part configured to determine that the second temperature sensor is abnormal when change of the temperature sensed by the first temperature sensor is larger than a predetermined first value and change of the temperature sensed by the second temperature sensor is smaller than a predetermined second value.