Dishwasher Blow-Out Opening Cooling in Sorption Drying
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Solution Overview
Problem
Sorption drying systems in dishwashers can cause the blow-out opening to overheat during moisture expulsion, posing a risk of burns to operators and potentially leading to malfunctions when accessing the interior for maintenance.
Innovation Solution
Cooling the blow-out opening using a circulating coolant, which is circulated by a pump also used for applying liquid to items, and operating the pump at a lower speed during cooling to intensify the cooling effect, while ensuring air recirculation through the drying material to prevent air escape and enhance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the blow-out opening is cooled by circulating coolant, then the temperature of the blow-out opening is reduced and burn risk is eliminated, but the number of components and installation space increase
Solution Approach 1:
The circulating pump is designed to serve dual functions: it operates at high speed to apply liquid to items for washing, and at low speed to circulate coolant through the blow-out opening for cooling. This multi-functionality eliminates the need for a separate cooling pump, thereby reducing component count and installation space while effectively lowering the blow-out opening temperature to prevent burn risks
2Temperature
If the pump operates at lower speed during cooling, then the cooling effect is intensified on the blow-out opening, but the liquid application to items is reduced
Solution Approach 1:
The pump operates dynamically at different speeds depending on the operational phase: at high speed during washing to ensure adequate liquid application to items for effective cleaning, and at low speed during the cooling phase to concentrate the liquid flow on the blow-out opening for intensive cooling. This dynamic speed adjustment allows the system to optimize liquid distribution for different functions without requiring additional components
3Device complexity
If air is allowed to escape from the dishwasher, then the closed circuit is simplified, but neighboring furniture can be damaged
Solution Approach 1:
The system captures the air that would otherwise escape and potentially damage neighboring furniture, and instead recirculates it through the drying material and back into the interior through the blow-out opening. This converts the harmful escaped air into a beneficial recirculated flow that maintains the closed circuit, prevents furniture damage, and enhances the efficiency of the sorption drying system
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
Effectively prevents overheating of the exhaust opening, reducing the risk of burns and maintaining efficient drying performance without increasing the number of components or installation space, while minimizing coolant usage and ensuring no air escapes to damage neighboring furniture.
Implementation Method 1
air first passing through a drying material suitable for exothermic drying to heat the liquid
Implementation Method 2
drying material suitable for exothermic drying
Implementation Method 3
the blow-out opening is cooled... the circulating pump is operated at a lower speed when the blow-out opening is being cooled
Data Source
Figure 1
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Figure 3
AI summary
The invention relates to a method for operating a dishwasher (GS), in particular, a domestic dishwasher, wherein at least washing material in an inner chamber (IR) is at least temporarily treated with heated fluid, wherein in order to heat the fluid air is first passed through a drying material (ZEO) suitable for exothermic drying and then the air together with the heated fluid driven out of the drying material (ZEO) is led through an outlet opening (AU), through which the air with fluid driven out of the drying material (ZEO) enters into the inner chamber (IR). According to the invention, the outlet opening (AU) is cooled.