Rotary Valve Contact Detection Using Phase Difference Sensing

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Solution Overview

Problem

Existing sensor systems for detecting mechanical contact between moving and non-moving parts of powder handling devices suffer from false positives and negatives due to interference from powders, cleaning agents, and noise, leading to contamination and inefficiencies.

Innovation Solution

A sensor system using phase difference detection between periodic electric signals and the powder handling device, incorporating voltage and current sensors to determine a phase difference below a threshold, which is robust to cleaning fluids and noise, allowing reliable contact detection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If electrical resistance detection is used to detect mechanical contact between moving and non-moving parts, then mechanical contact can be detected, but false positives occur due to influence from powders, cleaning agents, and noise

Engineering Contradiction:

Improvemechanical contact detection accuracyVSAvoidresistance measurement stability

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent changes the detection parameter from electrical resistance to phase difference of periodic signals. By injecting a periodic test signal and measuring the phase difference between the injected signal and the response signal, the system achieves more stable detection that is less susceptible to interference from powders, cleaning agents, and electrical noise, thereby resolving the contradiction between detection reliability and measurement precision

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the electrical resistance detection method with a periodic signal phase difference measurement method. This substitution transforms the detection approach from direct resistance measurement to indirect phase-based detection, which is inherently more robust against environmental interferences and provides both high reliability and precision in mechanical contact detection

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If filtering or data processing is introduced to reduce false positives, then false positives are reduced, but short-time mechanical contacts may not be detected (false negatives)

Engineering Contradiction:

Improvefalse positive reductionVSAvoiddetection response time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent employs periodic test signals with specific frequencies to probe the electrical path. By analyzing the phase difference of these periodic signals rather than using filtered resistance values, the system can detect both continuous and transient mechanical contacts without introducing time delays. The periodic nature of the signal allows for real-time detection while maintaining high reliability, resolving the contradiction between reducing false positives and avoiding false negatives

Inventive Principle:

Principle #19Periodic action

3Measurement precision

If low resistance threshold is set for mechanical contact detection, then mechanical contact detection sensitivity is improved, but false positives increase due to temporary resistance drops from powders and cleaning agents

Engineering Contradiction:

Improvecontact detection sensitivityVSAvoidfalse positive rate

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent fundamentally changes the detection parameter from resistance magnitude to phase difference. This parameter transformation allows for high sensitivity in detecting mechanical contact (through phase shift detection) while maintaining low false positive rates, as the phase difference measurement is not affected by temporary resistance drops caused by powders or cleaning agents interfering with the electrical path

Inventive Principle:

Principle #35Parameter changes

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

Provides reliable and robust detection of mechanical contact between moving and non-moving parts, reducing contamination and improving efficiency by minimizing false positives and negatives during operation and cleaning processes.

Implementation Method 1

determine a phase difference between a phase of the periodic signal component and a phase of a periodic signal component of the second electric signal

Methodology Applied

Scientific EffectPhase difference detection:

Data Source

PatentUS20250341553A1Sensor system and method for detecting a mechanical contact between a moving part and a non-moving part of a powder handling device

Publication Date: 2025.11.06 GEA PROCESS ENG

AI summary

Disclosed is a sensor system for detecting a mechanical contact between a moving part and a non-moving part of a powder handling device, such as a rotary valve. The sensor system comprises an electrical signal source configured to provide a first electric signal, the first electric signal comprising a periodic signal component, which is periodic with a predetermined period and a first electric component having a first electric impedance, wherein the electrical signal source and the first electric component are configured to be electrically connected to the rotating powder handling device so that the first electric component and the rotating powder handling device are connected in series to the electrical signal source. Further disclosed is a powder handling device comprising a sensor system and a method for detecting a mechanical contact between a moving part and a non-moving part of a powder handling device.