Dishwasher Spray Arm Overload Protection Using Magnetic Decoupling
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Solution Overview
Problem
Existing household dishwashers face issues with spray arm blockages leading to drive system overload, which can cause damage to the drive element or gear unit, especially when handling items or when the spray arm is manually manipulated.
Innovation Solution
A household dishwasher with an overload protection device that automatically switches from a coupled state to a decoupled state when a blockage occurs, using a spring-loaded mechanism to interrupt power transmission between the drive device and the spray arm, preventing damage to the drive system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an active drive is provided to drive the spray arm, then the spray arm can be reliably driven, but the drive system can be overloaded when blockage or manual handling occurs
Solution Approach 1:
The patent implements a magnetic coupling drive system where the magnetic coupling acts as a predetermined weak link that can slip under overload conditions. The magnetic coupling is designed with specific magnetic strength that allows it to decouple when excessive torque is applied, preventing damage to the drive element and gear unit. This beforehand cushioning mechanism ensures reliable normal operation while protecting against overload damage.
2Ease of operation
If the spray arm is manually handled or blocked, then operational flexibility is maintained, but the drive system becomes vulnerable to overload
Solution Approach 1:
The magnetic coupling provides dynamic torque transmission that automatically adapts to load conditions. During normal operation, the magnetic coupling transmits torque efficiently. When manual handling or blockage occurs causing excessive torque, the magnetic coupling dynamically decouples, allowing the spray arm to be manually moved or preventing drive system damage. This dynamic behavior maintains operational flexibility while protecting the drive 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
The overload protection device effectively prevents drive system overload and potential damage by automatically adjusting to blockages, ensuring the safety and longevity of the dishwasher components.
Implementation Method 1
The drive system includes a magnetic coupling. The magnetic coupling comprises a first part located inside a wash chamber of the dishwasher and a second part located outside the wash chamber
Implementation Method 2
The overload protection device is spring-loaded toward the coupled state
Data Source
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AI summary
The invention relates to a domestic dishwasher (1) comprising a washing container (2), a spray arm (17) for applying washing liquor and/or fresh water (F) to the dishwasher load held in the washing container (2), a drive system (19, 19ʹ) for actively driving the spray arm (17), and an overload protection mechanism (43, 43ʹ), which can move autonomously, if the spray arm (17) becomes blocked, from a coupling position (Z1), in which power is transmitted between the drive system (19, 19ʹ) and the spray arm (17) into a decoupling position (Z2), in which the power transmission between the drive system (19, 19ʹ) and the spray arm (17) is interrupted.