Filter Contamination Detection via Differential Pressure Sensors

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Solution Overview

Problem

Existing water purification filtration devices lack a cost-effective and user-friendly method for detecting filter medium contamination, leading to potential blockages and damage if not replaced promptly.

Innovation Solution

A filter medium contamination detection structure comprising a controller, a filter element, and a prompt assembly with two pressure sensors installed before and after the filter element, which detects changes in pressure difference to remind the user when the filter medium is dirty.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If pressure sensors are used to detect filter contamination, then measurement precision is improved, but device complexity increases

Engineering Contradiction:

Improvefilter contamination detection accuracyVSAvoidsensor system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The detection system is segmented into two independent pressure sensing paths: one measuring inlet pressure and another measuring outlet pressure. Each pressure sensor operates independently and connects to the controller through separate signal lines, allowing the system to detect pressure differential across the filter without requiring a single complex differential pressure sensor.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The pressure sensors serve multiple functions: they detect both absolute pressure values at inlet and outlet, calculate pressure differential for contamination detection, and can potentially monitor overall system pressure conditions. This multi-functionality reduces the need for additional specialized sensors.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If pressure sensors are installed to detect filter contamination, then reliability is improved, but manufacturing cost increases

Engineering Contradiction:

Improvefilter replacement timing accuracyVSAvoidproduct cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The system uses standard, off-the-shelf pressure sensors that are inexpensive and widely available, rather than specialized expensive differential pressure transducers. These conventional pressure sensors can be easily replaced if needed, and their low cost makes the overall system more economically viable while maintaining reliable contamination detection through differential pressure measurement.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The system automatically monitors filter condition and triggers replacement alerts without requiring manual inspection or specialized equipment. The controller continuously reads pressure sensor data, calculates differential pressure, and autonomously determines when filter replacement is needed, eliminating the need for expensive manual inspection procedures.

Inventive Principle:

Principle #25Self-service

3Device complexity

If manual inspection of filter medium is required, then device complexity is reduced, but ease of operation deteriorates

Engineering Contradiction:

Improvedetection system structureVSAvoidfilter status checking convenience

Core Design Contradiction:

Device complexityVSEase of operation

Solution Approach 1:

The system provides continuous feedback on filter condition through automated pressure differential measurement. The controller monitors the pressure difference between inlet and outlet sensors and compares it against predetermined thresholds, automatically generating replacement alerts when contamination levels indicate filter replacement is needed, eliminating manual inspection requirements.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The detection system operates autonomously without requiring user intervention for filter status checking. The pressure sensors continuously monitor conditions, the controller automatically processes the data, and the system generates alerts when needed, making the filter maintenance process self-monitoring and reducing operational burden on users.

Inventive Principle:

Principle #25Self-service

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 provides a low-cost and convenient method for detecting filter contamination, preventing blockages and damage by alerting users when the filter medium needs replacement, thus ensuring continuous and effective water filtration.

Implementation Method 1

The first pressure sensor may be connected to a water inlet of the filter element and the second pressure sensor may be connected to a water outlet end of the filter element or outside air

Methodology Applied

Scientific EffectPressure detection:

Data Source

PatentUS20250050246A1A filter medium contamination detection structure, a filter device, and a filter with abnormal warning function

Publication Date: 2025.02.13 INTEX MARKETING

AI summary

A filter medium contamination detection structure may comprise a filter element and a prompt assembly. The prompt assembly may comprise a first pressure sensor, which may comprise a signal output end, and a second pressure sensor, which may comprise a signal output end. The first pressure sensor may be connected to a water inlet of the filter element, and the second pressure sensor may be connected to a water outlet of the filter element or outside air. The signal output ends of the first pressure sensor and the second pressure sensor may be connected to a signal input end of a controller. When the filter element is dirty, a pressure at the water inlet end may increase or a pressure at the water outlet end may decrease, and the difference between the first sensor and the second pressure sensor may increase.