The test reports and field visits of many products reflect that the pressure drop has an important impact on product performance. The direct impact of air pressure reduction on the product is mainly the pressure difference caused by the pressure change. It creates a pressure on the outer casing of the sealed product, which under this pressure can damage the seal and reduce the reliability of the product. However, the main effect of the gas pressure reduction is that the reduction in gas pressure is accompanied by a decrease in atmospheric density, which in turn causes a great impact on the performance of the product. There are three main reasons for the impact on product performance.
1. The temperature rise of the heat-dissipating product increases as the atmospheric pressure decreases.
A considerable part of electrical and electronic products are heat-generating products, such as motors, transformers, contactors, resistors, and the like. These products consume a portion of the electrical energy into heat during use, so that the product heats up and the temperature rises. The temperature of the product rises due to heat, and this temperature rise is called temperature rise. The temperature rise of the heat-dissipating product increases as the atmospheric pressure decreases, and increases as the altitude increases. This can lead to performance degradation or unstable operation of the product.
2, the impact of low pressure on the sealing products
The effect of low air pressure on the sealing product is mainly due to the pressure difference formed by the change of atmospheric pressure. The pressure differential causes a force that points from a high pressure to a low pressure. Under this force, the gas is made to flow to reach equilibrium. For sealed products, the outer casing will withstand this force. This force can cause the casing to deform and the seal to rupture, causing product failure.
3. Influence of low air pressure on electrical performance
The altitude increase increases the air pressure and affects the electrical performance of electrical and electronic products. Especially in the case of air as an insulating medium, the effect of low air pressure on the equipment is more significant. Under normal atmospheric conditions, air can be a good insulating medium, and many electrical products use air as an insulating medium. When these products are used in high-altitude areas or as airborne equipment, due to the decrease in atmospheric pressure, a partial discharge phenomenon is often generated near the electrode with a strong electric field, which is called corona. More seriously, air gap breakdown sometimes occurs. This means that the normal working state of the device is destroyed.
The high and low temperature low pressure test chamber is specially designed for the electronics industry, national defense, aerospace and scientific research institutes to determine the quality and reliability of electronic products (including components, materials, equipment, and complete machines) under the action of high and low temperature and low pressure. Equipment, as well as a variety of tests for the measurement of electrical performance parameters and the adaptability of storage and use.
The article is from Beijing Yashilin Testing Equipment Co., Ltd.
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