Dishwasher Detergent Dispenser With Floating-Ball Actuation
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Solution Overview
Problem
Existing washing machine dispenser systems for dishwashers are complex and prone to wear, requiring multiple actuations for each dose of rinse aid and being cumbersome, especially when delivering multiple doses of washing agents during a single cycle.
Innovation Solution
A compact and simple actuation system using a solenoid actuator with a lever and rod mechanism, combined with a floating ball that moves between two seats, allows for efficient delivery of both detergent and rinse aid with reduced wear and fewer actuations, by leveraging the inclination of the dispenser to facilitate the movement of the ball and transfer of motion between components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single actuator is used to operate all delivery cycles of detergent and additive, then the device complexity is reduced, but the mechanism becomes cumbersome and subject to wear over time
Solution Approach 1:
The actuation system is segmented into distinct functional components: a solenoid actuator for initiating motion, a cam mechanism for converting linear motion to rotational motion, and a ratchet-detent system for maintaining positions. This segmentation allows each component to be optimized for its specific function, reducing overall complexity while improving reliability through specialized design.
Solution Approach 2:
A cam mechanism serves as an intermediary between the solenoid actuator and the valve/dispenser components. The cam converts the solenoid's linear reciprocating motion into rotational motion, which then actuates the rinse aid valve and detergent dispenser. This intermediary mechanism reduces wear on direct connection points while maintaining precise control.
2Measurement precision
If multiple actuations are required to deliver multiple doses of rinse aid, then the delivery precision is improved, but the loss of time increases significantly
Solution Approach 1:
The system maintains continuous readiness for dosing through the ratchet-detent mechanism, which holds the cam in position after each actuation. This allows the system to be ready for the next dose immediately without requiring full reset of the actuator, enabling rapid sequential dosing while maintaining precise control over each dose delivery.
Solution Approach 2:
The cam mechanism is pre-positioned by the ratchet-detent system after each actuation, preparing the system for the next dose in advance. This preliminary positioning eliminates the need for time-consuming reset operations and allows the solenoid to be re-triggered immediately for subsequent dosing cycles.
3Reliability
If the actuation system is reset every two actuations or by manual intervention, then the system reliability is maintained, but the ease of operation deteriorates
Solution Approach 1:
The ratchet-detent mechanism automatically resets the cam to its initial position after each actuation cycle, eliminating the need for manual intervention or complex electronic reset logic. The mechanical self-resetting feature maintains system reliability while significantly improving ease of operation, as the system autonomously prepares for the next dose without user input.
4Device complexity
If a compact coupling mechanism is used between actuator components, then the device complexity is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The cam mechanism employs asymmetric geometry with specifically designed lobes and profiles that convert linear motion to rotational motion in a compact form. The asymmetric shape allows for compact coupling while the precise geometric profile ensures accurate motion transfer, balancing compactness with manufacturing feasibility through intentional asymmetric design rather than requiring ultra-tight tolerances throughout.
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 system provides a robust, low-wear solution for delivering multiple doses of washing agents with fewer actuations, enhancing the efficiency and reliability of washing machine operations while minimizing mechanical stress and simplifying the dispenser's construction.
Implementation Method 1
A compact and simple actuation system using a solenoid actuator with a lever and rod mechanism
Implementation Method 2
by leveraging the inclination of the dispenser to facilitate the movement of the ball
Data Source
AI summary
A washing agent dispenser has two washing agent distributors controlled by a same actuation system that comprises a driving member, a driven member and an actuator device. The driven member has a seat in which there is operatively inserted, with possibility of relative movement, an engagement part of the driving member. According to the invention, also the driving member has a seat which, in at least one position of the actuation system, at least partially faces the seat of the driven member. The actuation system further comprises a floating body, able to displace in a controlled way between the two seats when said seats at least partially face one another.