dishwasher
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Solution Overview
Problem
Dishwashers face overheating issues with heaters, which can damage surrounding components, necessitating a solution to prevent overheating and protect these components.
Innovation Solution
A temperature control device is integrated into the dishwasher, featuring a switch that turns off the heater when the surrounding air reaches a predetermined temperature, using a sensor to monitor temperature and a holder to fix the switch in place, ensuring accurate detection and prevention of overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a heater is used to heat air during the drying operation, then a quick drying effect and sterilizing effect are obtained, but overheating of the heater results in damage of components located around the heater
Solution Approach 1:
The sensor is positioned to protrude further toward the inside of the housing than the holder, enabling it to detect the temperature of the fluid inside the housing before the heater causes overheating damage. This preliminary detection allows the switch to turn off the heater in advance, preventing the harmful effect while maintaining the drying efficiency.
2Measurement precision
If a sensor is positioned to measure temperature of fluid inside the housing, then accurate temperature detection is achieved, but the sensor structure becomes more complex
Solution Approach 1:
The sensor is nested within the housing structure, with the sensor protruding through the holder into the interior space where the fluid flows. This nested arrangement allows the sensor to access the fluid temperature directly without requiring a separate external mounting structure, achieving accurate measurement while maintaining structural simplicity.
3Reliability
If a holder is used to fix the switch to the housing and cover the switch coupling, then the switch is securely mounted, but the holder must accommodate the protruding sensor
Solution Approach 1:
The holder is segmented into distinct functional regions: a mounting portion that secures the switch to the housing, a coupling cover that protects the switch coupling, and an opening or passage that accommodates the protruding sensor. This segmentation allows each region to perform its specific function independently, achieving reliable mounting while simplifying the overall holder design.
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 prevents overheating of the heater, thereby protecting surrounding components from damage and ensuring safe operation of the dishwasher.
Implementation Method 1
a sensor protruding toward an inside of the housing and configured to measure a temperature of the fluid
Implementation Method 2
a heater coupled to one side of the housing; to heat air, a heater is used
Implementation Method 3
a fan positioned upstream of the switch and the heater inside the flow path and configured to draw air into the flow path
Data Source
AI summary
A dishwasher is disclosed. The dishwasher according to an embodiment of the present disclosure comprises a tub and a temperature control device disposed at one side of the tub. The temperature control device comprises: a housing which forms a flow path; a heater which is coupled to one side of the housing; a switch which turns off the heater in response to the temperature of the fluid around the heater ; which has reached a predetermined point, and includes a switch coupling coupled to the housing and a sensor protruding toward inside of the housing and configured to measure the temperature of the fluid; and a holder which is coupled to the housing and configured to fix the switch to the housing and cover the coupling part, wherein the sensor protrudes further toward the inside of the housing than the holder to measure the temperature of the fluid in the housing.