Low-Pressure Chamber Getter Pressure Control
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Solution Overview
Problem
In simulation experiments simulating high-altitude environments, conventional low-pressure chambers fail to maintain a predetermined air pressure due to degassing and leakage phenomena, leading to errors in experiment results.
Innovation Solution
A low-pressure chamber equipped with a pressure measurer, temperature controller, and getter, which adjusts the thermal conductor's temperature to maintain a preset air pressure by adsorbing or releasing molecules, using materials like activated carbon, barium, magnesium, zirconium, and phosphorus, and a thermal conductive material layer for heat exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical vacuum pump is used to reduce pressure in the low-pressure chamber, then the pressure can be reduced to a preset altitude range, but the pressure cannot be maintained due to degassing and leakage phenomena
Solution Approach 1:
The patent extracts and removes harmful gases and molecules from the low-pressure chamber by introducing a getter material. The getter selectively absorbs and traps degassed and leaked molecules, preventing them from accumulating and disrupting the pressure balance, thus resolving the pressure maintenance issue caused by degassing and leakage
Solution Approach 2:
The patent implements a feedback control system where a pressure sensor continuously monitors the internal pressure of the low-pressure chamber. When pressure deviations are detected, the system automatically activates the heater to control the getter's temperature, which in turn regulates gas absorption. This closed-loop feedback mechanism maintains stable pressure despite ongoing degassing and leakage
2Productivity
If the blocking valve is turned off to maintain pressure after reaching preset pressure, then the mechanical vacuum pump can be turned off, but the designed pressure cannot be maintained due to degassing and leakage
Solution Approach 1:
The patent ensures continuous pressure maintenance by keeping the getter material active throughout the experiment duration. The getter continuously absorbs degassed and leaked molecules, providing ongoing pressure stabilization without requiring the blocking valve to remain closed or the vacuum pump to run, thus enabling both experiment efficiency and pressure stability
Solution Approach 2:
The getter material serves as an intermediary between the vacuum environment and the degassing/leakage sources. It mediates the pressure balance by selectively absorbing harmful molecules while allowing the blocking valve to remain closed and the vacuum pump to be turned off, thus resolving the contradiction between experiment efficiency and pressure stability
3Reliability
If a getter is introduced to absorb molecules and maintain pressure, then pressure stability is improved, but the system complexity increases due to additional components
Solution Approach 1:
The patent merges the pressure control function into the existing low-pressure chamber structure by integrating the getter material directly within the chamber. The heater and pressure sensor are also integrated into the chamber assembly, creating a compact unified system that provides pressure stabilization without requiring separate external equipment, thus minimizing system complexity while improving pressure control
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 system effectively maintains a stable air pressure within a threshold range, reducing errors in simulation experiments by actively managing internal pressure through temperature adjustments and molecular adsorption/release.
Implementation Method 1
a getter connected to the thermal conductor to absorb or release molecules inside the low-pressure chamber based on the adjusted temperature
Implementation Method 2
a thermal conductor disposed inside the low-pressure chamber... adjusting a temperature of the thermal conductor
Data Source
AI summary
Provided is a method of designing a low-pressure chamber that provides a preset air pressure corresponding to a predetermined altitude. The method may include the steps of: calculating a predetermined error range of the preset air pressure, and calculating an amount and types of materials of a getter to be inserted into the low-pressure chamber based on the error range and a total volume of the low-pressure chamber.