Laundry washing machine
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Solution Overview
Problem
Existing laundry washing machines lack efficient control over liquid recirculation, which affects washing efficiency and product dissolution, leading to incomplete cleaning and potential product accumulation at the bottom of the tub.
Innovation Solution
A laundry washing machine with a dual recirculation system, comprising a first recirculation circuit for wetting the laundry and a second recirculation circuit for improving detergent dissolution, both controlled by separate pumps and filtering devices to independently manage liquid flow and prevent product accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single recirculation pump and circuit are used, then the device complexity is reduced, but the washing efficiency and control precision deteriorate
Solution Approach 1:
The recirculation system is divided into two independent circuits: a first recirculation circuit for withdrawing and re-admitting liquid to improve detergent dissolution, and a second recirculation circuit for withdrawing and re-admitting liquid to improve laundry wetting. Each circuit has its own pump (first recirculation pump and second recirculation pump) and can be controlled independently, allowing simultaneous optimization of detergent dissolution and laundry wetting without requiring a single complex integrated system
2Manufacturing precision
If liquid recirculation is not properly controlled, then the device complexity is reduced, but product dissolution completeness and washing quality deteriorate
Solution Approach 1:
The system applies different recirculation strategies to different regions and purposes: the first recirculation circuit targets the lower region of the washing tub to enhance detergent dissolution by repeatedly withdrawing and re-admitting liquid, while the second recirculation circuit targets the laundry to improve wetting. This localized approach ensures complete product dissolution and effective washing without requiring complex centralized control
3Reliability
If recirculation circuits are not independent, then the device complexity is reduced, but the ability to prevent product accumulation and maintain hygiene deteriorates
Solution Approach 1:
The system uses two separate recirculation circuits with independent pumps to prevent product accumulation: the first recirculation circuit handles detergent dissolution by circulating liquid through the lower tub region, while the second recirculation circuit handles laundry wetting. This segmentation ensures that detergent products are thoroughly dissolved and distributed before contacting the laundry, preventing accumulation and maintaining hygiene without requiring complex integrated control mechanisms
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
Enhances washing efficiency by ensuring complete wetting and dissolution of detergents, reducing product loss and maintaining hygiene by preventing accumulation at the bottom of the tub, thereby improving overall cleaning performance.
Implementation Method 1
a first recirculation pump suitable for forcing liquid inside the first recirculation circuit
Implementation Method 2
a second recirculation pump suitable for forcing liquid inside the second recirculation circuit
Data Source
AI summary
A laundry washing machine includes a washing tub (3) external to a rotatable washing drum (4) adapted to receive laundry. The machine further includes a water supply circuit (5) to supply water into the washing tub (3), a washing/rinsing products supplier (6) to supply washing/rinsing products into the washing tub (3), a liquid outlet circuit (25) suitable for withdrawing liquid from the washing tub (3) and conveying such a liquid to the outside. The machine further includes a first recirculation circuit (20) suitable for withdrawing liquid from the washing tub (3) and re-admitting such a liquid into a first region (3b) of said washing tub (3), wherein the first recirculation circuit (20) includes a first recirculation pump (21) suitable for forcing liquid inside the first recirculation circuit (20) and a second recirculation circuit (30) suitable for withdrawing liquid from the washing tub (3) and re-admitting such a liquid into a second region (3c) of the washing tub (3). The second recirculation circuit (30) includes a second recirculation pump (31) suitable for forcing liquid inside the second recirculation circuit (30).