Laundry Filter Microparticle Detection Mechanism
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Solution Overview
Problem
Laundry appliances lack effective mechanisms to detect and manage the accumulation of microparticles in fine-particle filters, leading to reduced filtration efficiency and potential environmental contamination.
Innovation Solution
A filtration assembly with a pressure sensor and retention feature that monitors fluid flow and accumulates microparticles, triggering a mechanism to maintain the filter's operational state until it is reset, ensuring continuous appliance operation and preventing microparticle release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a filter accumulates microparticles in the fluid path, then filtration efficiency is improved, but fluid flow resistance increases and eventually blocks the filter
Solution Approach 1:
The pressure sensor detects increasing fluid flow resistance before the filter becomes completely blocked, triggering a warning signal to the controller. This preliminary detection allows the system to alert the user to clean or replace the filter before it fails, maintaining continuous reliable operation.
Solution Approach 2:
The system implements a feedback loop where the pressure sensor continuously monitors fluid flow resistance across the filter, and the controller receives this information to determine when filter maintenance is needed. This closed-loop feedback ensures the filter operates effectively throughout its service life.
2Measurement precision
If a pressure sensor and retention feature are added to detect filter saturation, then filter monitoring capability is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical monitoring mechanisms with a pressure sensor that electrically detects filter saturation. This substitution of mechanical systems with sensing elements simplifies the overall structure while improving detection precision.
Solution Approach 2:
The pressure sensor serves multiple functions: it monitors fluid flow resistance, detects filter saturation, and triggers warning signals. This multi-functionality reduces the need for separate monitoring components, thereby reducing overall device complexity while maintaining high measurement precision.
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 solution effectively detects filter saturation, prevents microparticle release into the environment, and maintains appliance functionality by requiring filter maintenance, enhancing filtration efficiency and reducing environmental impact.
Implementation Method 1
A pressure sensor has a membrane that moves from an initial position in response to the accumulation of the microparticles
Implementation Method 2
A magnetic connection is between the arm and the filter. The magnetic connection biases the membrane away from the initial position in response to the decrease in the fluid flow through the filter
Data Source
AI summary
A laundry appliance includes a filter that accumulates microparticles in a fluid path, a pressure sensor having a membrane that moves from an initial position toward a saturated position in response to the accumulation of the microparticles, an arm operably coupled with the pressure sensor, and a retention feature interposing the arm and the filter to operably couple the pressure sensor with the filter, wherein the retention feature maintains the membrane in the saturated position in response a threshold saturation of the filter with the microparticles.