Purge Device Dynamic Flow Control for Pressure Stability
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Solution Overview
Problem
Existing purge devices face challenges in preventing negative pressure inside storage containers, leading to potential contamination from outside air and dust when the purge gas flow rate is reduced, causing purge gas to leak into sealed areas.
Innovation Solution
A purge device with a supply pipe, a supply flow rate adjuster, a discharge pipe, and an intake flow rate adjuster that allows for adjustable flow rates, including a first and second flow rate, and a valve system to control intake flow rates, ensuring no negative pressure is created inside the container, thereby preventing contamination and gas leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the purge gas flow rate supplied to the storage container is reduced, then the amount of purge gas leaking into the sealed area is reduced, but the pressure inside the storage container becomes negative relative to the outside, causing contaminated air and dust to be sucked in
Solution Approach 1:
The system uses a pressure sensor to detect the internal pressure of the storage container and feeds this information back to the controller. The controller adjusts the intake flow rate based on the detected pressure to maintain positive or neutral pressure conditions, preventing contamination while managing purge gas usage efficiently.
Solution Approach 2:
The intake flow rate is made dynamically adjustable based on supply flow rate conditions. The system transitions from a fixed intake flow rate to a variable one that adapts to different supply flow rates, using a plurality of intake flow rates selected according to the supply flow rate to optimize both leakage prevention and contamination protection.
2Object-affected harmful factors
If the intake flow rate is increased to prevent negative pressure, then contaminated air and dust are prevented from entering, but the amount of purge gas leaking into the sealed area increases
Solution Approach 1:
The system implements a dynamic intake flow rate control strategy where the intake flow rate is selected from multiple predetermined rates based on the actual supply flow rate. This allows the system to optimize the balance between preventing negative pressure (and contamination) and minimizing purge gas leakage into the sealed area.
Solution Approach 2:
The system changes the operating parameters by selecting from multiple intake flow rates corresponding to different supply flow rates. This parameter adaptation allows efficient purge gas usage while maintaining proper pressure conditions to prevent contamination.
3Ease of operation
If a fixed intake flow rate is used, then the system operation is simple, but the system cannot adapt to arbitrary changes in supply flow rate, leading to either negative pressure or excessive purge gas leakage
Solution Approach 1:
The system transitions from a static fixed intake flow rate to a dynamic variable intake flow rate system. The intake flow rate can now adapt to different supply flow rate conditions while maintaining simple operation through automated controller-based selection from predetermined flow rate options.
Solution Approach 2:
The system implements periodic or conditional adjustment of the intake flow rate based on supply flow rate changes. The controller selectively changes the intake flow rate according to the supply flow rate conditions, providing adaptability while maintaining operational simplicity through structured decision-making.
Data Source
AI summary
A purge device includes a supply flow rate adjuster, which adjusts a supply flow rate of a purge gas supplied to a storage container through a supply pipe, and an intake flow rate adjuster, which adjusts an intake flow rate of the purge gas taken in from an inside of the storage container through a discharge pipe to prevent the pressure of the inside of the storage container from becoming negative relative to an outside of the storage container. The supply flow rate adjuster adjusts the supply flow rate in at least two stages including a first flow rate and a second flow rate that is higher than the first flow rate. When the supply flow rate is the first flow rate, the intake flow rate adjuster sets the intake flow rate to zero.