Pressurized Enclosure Purge Gas Flow Trend Monitoring

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Solution Overview

Problem

Existing pressurized enclosures face high flushing gas consumption and potential false readings due to internal gas releases, which can lead to inefficient maintenance and system failures, as they require constant flushing gas outflow and high internal pressure to monitor trends effectively.

Innovation Solution

A pressurized enclosure with a flow meter at the purge gas inlet and an evaluation device that predicts the trend of purge gas inflow, allowing for regulated internal pressure maintenance and early detection of leaks, with options for remote monitoring and energy-efficient operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If constant purge gas outflow is maintained to monitor trends effectively, then measurement reliability is improved, but purge gas consumption increases

Engineering Contradiction:

Improvemeasurement reliabilityVSAvoidpurge gas consumption

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

Instead of measuring purge gas outflow at the outlet, the patent measures purge gas inflow at the inlet. This inversion allows trend monitoring of leakage without requiring constant outflow, as the inflow measurement directly reflects the amount of gas needed to compensate for leaks, thereby reducing purge gas consumption while maintaining measurement reliability.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent extracts the measurement function from the outflow path and places it at the inlet. By measuring only the inflow of purge gas needed to maintain pressure, the system eliminates the need for continuous outflow monitoring, thus reducing purge gas consumption while still providing reliable trend data for leakage detection.

Inventive Principle:

Principle #2Taking out (Extraction)

2Measurement precision

If high internal pressure is maintained in the housing, then trend detection accuracy is improved, but energy consumption increases

Engineering Contradiction:

Improvetrend detection accuracyVSAvoidenergy consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by stationary object

Solution Approach 1:

The patent inverts the measurement approach from monitoring outflow under high pressure to monitoring inflow at the inlet. This allows accurate trend detection by measuring the purge gas supply rate needed to maintain pressure, without requiring excessively high internal pressure, thereby reducing energy consumption while preserving measurement precision.

Inventive Principle:

Principle #13The other way round (Inversion)

3Reliability

If purge gas outflow is increased to ensure continuous purging, then safety is improved, but purge gas consumption increases

Engineering Contradiction:

ImprovesafetyVSAvoidpurge gas consumption

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The patent uses feedback control by measuring the actual purge gas inflow and using this information to adjust the purge gas supply. The control device regulates the inlet valve based on the measured inflow rate and pressure conditions, ensuring continuous purging and safety while optimizing purge gas consumption by avoiding excessive flow rates.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent changes the operational parameters by measuring inflow rather than outflow, and by using this measurement to dynamically adjust the purge gas supply rate. This allows the system to maintain safety through continuous purging while optimizing consumption by adapting the flow rate to actual leakage conditions rather than maintaining a constant high flow.

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

This solution reduces flushing gas consumption and provides accurate early warnings for maintenance, enabling timely intervention and minimizing system failures by predicting when the purge gas inflow will exceed threshold values, thus optimizing resource use and reliability.

Implementation Method 1

a flow meter (7) at the purge gas inlet (3) for detecting the purge gas flow

Methodology Applied

Scientific EffectFlow measurement:

Implementation Method 2

with a pressure gauge or pressure switch monitoring the internal pressure in the housing

Methodology Applied

Scientific EffectPressure monitoring:

Implementation Method 3

an evaluation device which calculates a trend curve from the purge gas flow detected by the flow meter (7)

Methodology Applied

Scientific EffectTrend analysis:

Implementation Method 4

a control device which actuates the inlet valve (6) at the purge gas inlet (3) to maintain a constant internal pressure

Methodology Applied

Scientific EffectPressure regulation:

Data Source

PatentEP3772048B1Overpressure encapsulation

Publication Date: 2021.06.16 SIEMENS AG

Figure 1~2
Figure 3~4

AI summary

Overpressure encapsulation with a housing (2) which is connected to a purge gas source (5) via a purge gas inlet (3), with an inlet valve (6) arranged between the purge gas source (5) and the purge gas inlet (3), with a pressure gauge or pressure switch (10) monitoring the internal pressure in the housing (2), with a control device (11) designed to control the inlet valve (6) to maintain a set internal pressure in the housing (2), with a flow meter (7) between the purge gas source (5) and the purge gas inlet (3) detecting the purge gas flow, and with an evaluation device (13) which calculates a trend curve of the purge gas flow and a time when the trend curve exceeds a threshold value.