Washing Machine Inlet Layout for Spin-Cycle Foam Containment
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Solution Overview
Problem
Existing washing machines experience foam escape during the spin cycle, leading to unsightly foam exit, which is not reliably prevented by pressure monitoring and requires costly design modifications.
Innovation Solution
The water inlet opening is positioned closer to the drum than the tub's surrounding walls, creating a storage space for foam and pressure differences that prevent foam from escaping through the inlet connection, with a design featuring a narrowed trough to enhance flow and reduce turbulence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure monitoring is used to prevent foam escape, then foam control is improved, but reliability is insufficient because pressure increase depends on foam consistency and sealing variability
Solution Approach 1:
The invention extracts the foam handling function from the water inlet system by providing a separate foam outlet opening in the tub bottom. This separates the foam discharge path from the water inlet, allowing foam to be removed independently without affecting water supply reliability.
Solution Approach 2:
The invention introduces an intermediary foam collection space between the drum and tub bottom where foam accumulates before being discharged. This intermediate space acts as a buffer that prevents direct foam escape through the water inlet connection, improving reliability without complex monitoring systems.
2Object-affected harmful factors
If the water inlet connection is positioned at maximum height difference from the flushing cistern, then foam escape is reduced, but installation space requirements increase
Solution Approach 1:
The invention extracts the foam discharge function from the water inlet system by providing a separate foam outlet opening in the tub bottom. This separates the foam discharge path from the water inlet, allowing foam to be removed independently without affecting water supply reliability.
Solution Approach 2:
Instead of solving foam escape by vertical positioning (height difference), the invention addresses it by creating a horizontal foam collection space between the drum and tub bottom. This dimensional approach to foam management reduces the need for excessive vertical clearance while effectively containing foam.
3Object-affected harmful factors
If constructive precautions are taken to prevent foam escape, then foam control is improved, but material costs and assembly work increase
Solution Approach 1:
The foam outlet opening serves multiple functions: it collects foam during washing, drains foam during spinning, and maintains pressure balance. This multi-functional design prevents foam escape without requiring additional specialized components, reducing manufacturing complexity and cost.
Solution Approach 2:
The foam outlet system operates automatically based on pressure differences and foam accumulation, requiring no external control systems or complex assembly. The self-regulating nature of the foam discharge reduces both manufacturing complexity and assembly requirements.
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 configuration effectively contains foam within the washing machine, preventing its escape and reducing material and installation costs by avoiding the need for additional design features.
Implementation Method 1
In the spin cycle of washing machines, not only water but also the detergent contained in the laundry is expelled
Implementation Method 2
it is seen as a disadvantage of the prior art that it does not always work reliably since the extent of the pressure increase depends on the consistency of the foam
Data Source
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AI summary
The top loading horizontal axis washing machine has a washer-dryer (3) in which a drum (4) is pivoted, where an inlet (6) is provided in the wall of the washer-dryer for the washing liquid. A water inlet connection (7) is arranged with a detergent dispenser for the detergent. The inlet is arranged in a shell sided wall (10) of the washer-dryer near a shell (11) of the drum. A wall area (12) forms a storage space (13).