1 What is a low-pressure test ?

Low pressure test is a method of verifying the adaptability of products in high-altitude or high-altitude environments by simulating low pressure conditions in such environments. This experiment reduces the air pressure inside the box to the value specified in the relevant testing standards. Maintain a certain amount of time and record relevant data. Evaluate the performance of the product under different air pressure conditions through data analysis.This helps to detect design defects early and reduce the failure rate in actual use.

2 Why is a low-pressure test necessary?

In natural environments, atmospheric pressure decreases with increasing altitude. When automotive electronics, aviation products, batteries, and other components are stored or used in high-altitude or high-altitude environments, low air pressure can have an impact on them. A decrease in air pressure may cause material expansion, rupture, and leakage of gas or liquid in the sealed chamber, leading to product failure. Therefore, low-pressure testing helps simulate these extreme conditions and ensure the reliability of the product in practical use.

3 Purpose of low-pressure test

The main purpose of low-pressure testing is to determine the adaptability of products to low-pressure environments during storage, transportation, and use. This test, also known as high-altitude testing or low-pressure testing, aims to ensure that the product does not experience performance degradation or structural damage in low-pressure environments.

4 Low pressure test chamber

A testing device capable of vacuum processing. It simulates low-pressure environments at different altitudes by precisely controlling the air pressure inside the box, and is widely used for performance testing of electronic appliances, aerospace equipment, automotive components, and other products.

In high-altitude areas such as plateaus, mountains, and during aircraft flight, air pressure significantly decreases with increasing altitude. In this environment, the oxygen content in the air decreases, the temperature drops, and the humidity changes, which has a significant impact on the human body and equipment. For some equipment that needs to be used in high-altitude or aviation environments, low-pressure environments may cause performance degradation or even failure.

The low-pressure test chamber simulates low-pressure environments at different altitudes by adjusting the internal pressure. Its working principle is based on the physical law that atmospheric pressure decreases with increasing altitude. The air inside the test chamber is extracted or compressed by a vacuum pump or compressor to change the air pressure inside the chamber. In addition, to ensure the stability of environmental parameters such as temperature and humidity during the experimental process, the equipment is also equipped with a temperature control system and a humidity control system. In this way, various performance tests can be conducted in a simulated environment to ensure that the product can run stably in actual use.

5 Related standards

The testing process of the low-pressure test chamber usually refers to

IEC 62133

UL 1642

UN 38.3

This standard specifies the environmental testing methods conducted under low-pressure conditions to ensure the reliability of the test object under various environmental conditions.

6 Structural analysis

• Chamber structure

The low-pressure test chamber adopts an integral combination structure. The main components of the test chamber include the insulation box (pressure bearing structure) located at the front, the refrigeration and vacuum unit at the rear, and the electrical system on the right. The insulation box is used to maintain the temperature and air pressure inside the box, ensuring the stability of the testing environment; The refrigeration and vacuum units are responsible for regulating the internal air pressure and temperature; The electrical system is used to control the operation of the entire equipment.

• Control system

The control system is the core part of the low-pressure test chamber, responsible for regulating parameters such as air pressure, temperature, and humidity inside the chamber. This system usually adopts PID (Proportional Integral Derivative) control algorithm and SSR (Solid State Relay) co channel coordinated control, and sets test parameters such as pressure range, temperature range, and humidity range through touch screen display. The operator can set corresponding parameters according to the testing requirements, and the control system will automatically complete the entire testing process.

• Vacuum system

The vacuum system is an important component of the low-pressure test chamber, responsible for reducing the air pressure inside the chamber. The system consists of a vacuum pump, a vacuum valve, and a vacuum measurement system. A vacuum pump is used to generate negative pressure and extract air from the box to reduce air pressure; Vacuum valves are used to control the start stop and adjust the vacuum degree of vacuum pumps; The vacuum measurement system uses pressure strain technology to achieve accurate measurement of vacuum degree.

In low-pressure environments, the performance of the product may undergo significant changes and even malfunction. By simulating these extreme environments, low-pressure test chambers can help companies detect potential problems with products in a timely manner, avoid product failures during actual use, and improve product quality and reliability. This is particularly important for fields such as aerospace, automotive manufacturing, and electronics, as these products often need to operate in extreme environments where reliability is crucial.

Overall, low-pressure test chambers play an irreplaceable role in ensuring product quality and performance, and are essential tools in the development and production of high-precision equipment.