Linear-Actuated Streaming Current Monitor for Stable Piston Reciprocation

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Solution Overview

Problem

Existing streaming current monitors (SCMs) suffer from reliability issues due to excessive heat generation, wear and tear, and mechanical misalignment, leading to unstable measurement readings and significant measurement errors.

Innovation Solution

A streaming current monitor (SCM) utilizing a linear actuator with a stationary part and a moving part, comprising a permanent magnet and wire coil, along with magnetic position sensors and a support mechanism to ensure precise piston movement and stable measurements, eliminating the need for complex motor and gearbox arrangements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If a motor and gear box arrangement is used to drive the piston, then the piston can be driven to reciprocate in the cylinder, but excessive heat is generated which must be dissipated

Engineering Contradiction:

Improvepiston reciprocation speedVSAvoidheat generation

Core Design Contradiction:

SpeedVSTemperature

Solution Approach 1:

The patent replaces the motor and gear box arrangement with a linear actuator that uses electromagnetic fields to directly drive the piston reciprocation. This substitution eliminates the mechanical components that generate excessive heat, while still achieving the required piston motion for colloid sampling and streaming current measurement.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Speed

If a motor and gear box arrangement is used to drive the piston, then the piston can be driven to reciprocate in the cylinder, but wear and tear on moving parts results in significant measurement errors

Engineering Contradiction:

Improvepiston reciprocation speedVSAvoidmeasurement stability

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent eliminates the mechanical drive train (motor and gear box) by using a linear actuator with electromagnetic fields to directly control piston motion. This removes the moving mechanical parts that cause wear and tear, thereby preventing measurement errors and improving long-term reliability of the streaming current measurements.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent extracts and removes the problematic mechanical drive components (motor and gear box) from the system, retaining only the essential piston reciprocation function achieved through the linear actuator. This extraction eliminates the source of wear and measurement errors while preserving the core measurement capability.

Inventive Principle:

Principle #2Taking out (Extraction)

3Speed

If a motor and gear box arrangement is used to drive the piston, then the piston can be driven to reciprocate in the cylinder, but unevenness in piston stroke due to misalignment or looseness distorts the streaming current signal

Engineering Contradiction:

Improvepiston reciprocation speedVSAvoidstreaming current signal accuracy

Core Design Contradiction:

SpeedVSMeasurement precision

Solution Approach 1:

The patent replaces the mechanical drive system with a linear actuator that provides precise, controlled piston motion through electromagnetic fields. This eliminates mechanical misalignment and looseness issues, ensuring consistent piston stroke and accurate streaming current measurements throughout the reciprocation cycle.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Device complexity

If a linear actuator is used to drive the piston, then mechanical complexity is reduced and wear is minimized, but the actuator generates heat that must be managed

Engineering Contradiction:

Improvedrive mechanism complexityVSAvoidactuator heat generation

Core Design Contradiction:

Device complexityVSTemperature

Solution Approach 1:

The patent uses a linear actuator with electromagnetic fields to replace complex mechanical drive mechanisms, reducing overall system complexity and eliminating wear. The actuator is designed with heat dissipation features including thermal management in the coil assembly and heat sinks to manage the heat generated during operation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 SCM provides accurate, reliable, and maintenance-friendly operation by reducing power consumption, simplifying maintenance, and ensuring consistent measurement accuracy through improved mechanical stability and reduced wear.

Implementation Method 1

the moving part of the linear actuator comprises a permanent magnet and the stationary part comprises at least one wire coil to generate a magnetic force to cause the moving part, shaft and piston to reciprocate

Methodology Applied

Scientific EffectElectromagnetic interaction: Electromagnetic Induction

Data Source

PatentUS12624980B2Streaming current monitor

Publication Date: 2026.05.12 DBG IP LTD

AI summary

A streaming current monitor comprises a cylinder in fluid communication with a flow-path between an inlet and outlet and a piston received in the cylinder. A drive mechanism is configured to drive reciprocation of the piston in the cylinder to move colloid into and out of the cylinder via an annular space between the piston and cylinder. A pair of electrodes are exposed in a wall of the cylinder and spaced apart in a moving direction of the piston to sense a charge characteristic of the colloid. The drive mechanism is a linear actuator comprising a stationary part and a moving part connected to the piston via a shaft.