Handheld Electrostatic Voltage Probe for Hydraulic Filter Monitoring
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Solution Overview
Problem
Hydraulic system filters experience electrostatic charging due to insulating structures, leading to potential differences and spark discharges, which can damage the filter medium and fluid, particularly in combustible fluids, and existing grounding methods are inefficient and costly.
Innovation Solution
A measuring device with a detachable measuring head and sensor that connects to the filter housing via a screw-in thread, allowing voltage measurement on the clean side of the filter medium without fluid leakage, using a high-voltage probe with an insulating device to protect the operator and featuring a sensor with enlarged surface area for sensitive measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulating structures are used in filter housing, then electrical safety is improved, but electrostatic charging occurs leading to potential differences and spark discharges
Solution Approach 1:
A measuring device with a measuring head and sensor is introduced as an intermediary tool to detect electrostatic charges. The measuring head connects to the filter housing via a connection piece with sealing device, and the sensor measures the voltage in the flowing fluid or filter medium, providing information about electrostatic conditions without directly interfering with the electrostatic field.
Solution Approach 2:
The patent replaces direct physical intervention (grounding measures) with an electrical measurement approach. Instead of mechanically grounding components to prevent electrostatic discharge, the invention uses a sensor-based measurement system to detect and monitor electrostatic charges, allowing for indirect observation and analysis of the electrostatic situation.
2Object-affected harmful factors
If grounding measures are implemented, then electrostatic discharge is reduced, but device complexity and cost increase
Solution Approach 1:
The measuring device provides feedback information about electrostatic charges in the hydraulic system. By measuring the voltage in the flowing fluid or filter medium and displaying it, the system enables monitoring of electrostatic conditions, allowing operators to assess whether grounding measures are necessary or if the current setup is adequate, thereby avoiding unnecessary complexity.
Solution Approach 2:
The measurement system enables self-assessment of electrostatic conditions. Instead of requiring complex grounding equipment to prevent all potential discharges, the measuring device allows the system to monitor its own electrostatic state, and grounding measures can be applied selectively based on the measured values, reducing overall system complexity.
3Measurement precision
If a permanent measuring connection is made in the filter housing, then measurement reliability is improved, but fluid leakage occurs
Solution Approach 1:
The measuring device is segmented into separate components: a measuring head that connects to the filter housing via a connection piece, and a sensor that measures voltage. The sealing device in the connection piece creates a localized seal at the connection point, preventing fluid leakage while allowing the measuring head to be detachably connected for reliable measurement.
4Measurement precision
If the sensor measures voltage on the clean side of the filter medium, then measurement accuracy is improved, but the risk of contamination increases
Solution Approach 1:
The connection piece with sealing device acts as an intermediary that allows the measuring head to access the clean side of the filter medium without compromising the seal. The sealing device ensures that the connection point remains sealed, preventing unfiltered fluid from contaminating the measurement system while allowing accurate voltage measurement on the clean side.
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
Enables accurate measurement of electrostatic charges and potential differences, allowing for selection of filter materials with reduced triboelectric voltage, preventing damaging discharges and extending maintenance intervals by identifying and mitigating electrostatic issues in hydraulic systems.
Implementation Method 1
Due to the partially insulating structure of such filters, caused by insulating layers between filter-effective layers of the filter medium or by isolating the filter medium from the end caps of the filter, as well as a support tube of the filter, electrostatic charging of the filter medium occurs when the fluid passes through with any particulate contamination present and thus of the fluid itself.
Implementation Method 2
Due to the potential differences generated, caused by the passage of fluid, within the filter medium or the filter, sudden discharges can then occur between statically charged filter element parts, such as the filter medium, compared to the metal filter housing in which the filter element is accommodated, with the result that sparking cannot be ruled out.
Implementation Method 3
allowing for selection of filter materials with reduced triboelectric voltage, preventing damaging discharges
Data Source
Figure 1~2
AI summary
The invention relates to a measuring apparatus (10) for determining the electrical potential in a filter medium and/or in a fluid flowing through the filter medium (12), comprising a measuring instrument (22) for measuring electrical potential values, to which it is possible to connect a measuring device (26) which is formed as a handheld instrument, and has at least one measuring head (28) which dips into the flowing fluid with a sensor (30) for a measurement. The invention further relates to a marketable kit together with a handheld instrument.