Variable-Speed Fan Impeller Drying for Residual Water in Dishwashers
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Solution Overview
Problem
Conventional dishwasher drying systems are ineffective in completely removing liquid from depressions in washware items, leading to residual water that can cause unsightly deposits and requires manual intervention, which is inconvenient and time-consuming.
Innovation Solution
A rotatable fan wheel with a variable-speed motor is integrated into the dishwasher, allowing for different air flow strengths and speeds to be used during the drying cycle, including a high-speed blow-off phase followed by a convection drying phase, to effectively remove liquid from depressions and reduce energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional drying systems are used, then energy consumption is reduced, but liquid in depressions cannot be completely removed
Solution Approach 1:
The fan wheel operates with variable speed, switching between a first operating state (lower speed) and a second operating state (higher speed). This dynamic operation allows the system to achieve effective liquid removal in depressions while managing energy consumption, as the high-speed state is only activated when needed for blow-off phases.
Solution Approach 2:
The drying process alternates between different operating states of the fan wheel. The control device switches between the first and second operating states periodically, using high-speed operation for brief blow-off phases to remove liquid from depressions, then returning to lower-speed convection drying, thereby balancing effectiveness with energy efficiency.
2Use of energy by moving object
If fan speed is varied over time, then energy consumption and noise are reduced, but control complexity increases
Solution Approach 1:
The motor's rotational speed is made variable through electronic control, allowing the fan wheel to operate in different states. This dynamic speed control enables the system to optimize energy consumption and noise levels while maintaining effective drying performance.
Solution Approach 2:
The control device changes the operational parameters of the motor, specifically its rotational speed, to switch between different operating states. By adjusting this key parameter, the system achieves energy efficiency and noise reduction without requiring complex mechanical modifications.
3Ease of operation
If conventional drying methods are used, then device complexity is low, but manual intervention is required to remove residual liquid
Solution Approach 1:
The drying system is designed to automatically remove liquid from depressions without requiring manual intervention. The variable-speed fan wheel, controlled by a control device, performs the blow-off function automatically, eliminating the need for users to manually tilt or wipe items after washing.
Solution Approach 2:
The automatic blow-off function is achieved through dynamic speed control of the fan wheel. The system automatically transitions to high-speed operation during blow-off phases, effectively removing liquid from depressions without user intervention, thereby improving ease of operation despite increased device complexity.
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 efficiently removes liquid from washware items, reduces energy usage, and minimizes noise levels by varying fan speed, ensuring thorough drying without manual intervention and preventing water marks.
Implementation Method 1
at least one rotatable fan wheel (17) is arranged in the washing compartment (2), with which air can be sucked in on the one hand and air can be blown out on the other hand
Implementation Method 2
at least one rotatable fan wheel (17) is arranged in the washing compartment (2), with which air can be sucked in on the one hand and air can be blown out on the other hand
Data Source
Figure 1
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AI summary
A dishwasher (1), in particular a domestic dishwasher, comprising a dishwashing compartment (2) for receiving items of washware, such as tableware, glasses, cutlery or the like, for example, is designed such that at least one rotatable fan impeller (17) is arranged in the dishwashing compartment (2), it being possible firstly to draw in air and secondly to blow out air using said fan impeller, wherein a motor (18), the rotation speed of which can be varied over time, is associated with the at least one fan impeller (17).