Application and structural principle of high and low temperature test chamber
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The high and low temperature test chamber is a widely used environmental adaptability testing equipment for mechanical industry products, instruments, electronic and electrical products, as well as their components and materials. They can simulate the performance of products under extreme temperature conditions, including two main types: abrupt and gradual, each suitable for different testing needs.
1、 Purpose:
High and low temperature mutation test chamber
The high and low temperature test chamber is mainly used to evaluate the adaptability and performance stability of various mechanical industrial products, instruments and meters, electronic and electrical products, their components and materials in rapidly changing temperature environments, especially playing an important role in cold and hot shock testing. These test chambers must comply with strict regulations of the International Electrotechnical Commission (IEC) and national standards (GB), such as IEC-68-2 and GB2423.22, to ensure the reliability and comparability of the testing process and results, and provide scientific basis for product design improvement and quality control.
High and low temperature gradient test chamber
The high-low temperature gradient test chamber is specifically designed to evaluate the performance of products under environmental conditions with gradually changing temperatures, such as simulating long-term exposure inside a car or outdoors. This test chamber is designed and manufactured in accordance with the requirements of the International Electrotechnical Commission (IEC) and national standards (GB), and complies with the standards of IEC-68-2 test Nb and GB2423.22 test b. It ensures the rate and stability of temperature changes, accurately simulates the actual usage environment, and provides a reliable evaluation basis for the reliability and durability of the product.
2、 Structural principle
1. High and low temperature mutation test chamber (constant temperature medium air)
The working principle of the test box with a balance structure is similar to that of a balance scale, where the sample is placed in a mesh box on two trays. Compressed air drives the balance support rod to move up and down, quickly transferring the sample from the normal temperature environment to the high and low temperature chambers for testing. During the lifting process, the sample will be exposed to a normal temperature area for a period of time, and then placed in a high and low temperature environment for thermal shock testing.
The vertically movable test box for the sample is placed in the high and low greenhouses of the upper and lower layers of the test box, and the sample is vertically lifted and lowered by a speed regulating motor installed on the top of the box. This compact structure allows the sample to be quickly alternately exposed to high and low temperature environments during the lifting process, achieving thermal shock testing. The static position of the specimen ensures a reduction in the impact of mechanical stress on the test results during the impact process.
2. High and low temperature mutation test chamber (constant temperature medium liquid)
This type of equipment uses liquids such as water, salt water, or silicone oil as a constant temperature medium, and the sample is suspended on a mechanism composed of a torque motor and a cylinder. Through the lifting and rotation of these mechanisms, the sample can be alternately immersed in the set high and low temperature liquid tanks for thermal shock testing. Liquid media can provide high thermal conductivity efficiency, ensuring rapid and uniform temperature changes in the sample during the impact process, simulating the rapid temperature changes in real environments.
3. Temperature jump type fluid particle tank (constant temperature medium solid)
By using powdered solid particles as the heat transfer medium and utilizing an air jet device to fluidized it, efficient cold and hot shock testing can be achieved.
The working principle uses powdered solid particles as the heat transfer medium, and the solid particles are fluidized through an air jet device. This structure is similar to a liquid medium device, but the heat transfer medium is changed from liquid to solid particles. The use of solid particles can effectively eliminate the problem of test liquid loss caused by liquid media, and the equipment operation is more convenient, making it easier to clean the sample.
4. High and low temperature gradient test chamber structure
This test chamber is equipped with a precisely controlled temperature system inside, which can gradually change the temperature according to a preset heating and cooling rate. Usually, automatic program control devices are designed to ensure the accuracy and repeatability of temperature changes. The gradual temperature changes can be simulated through a single test chamber, which is suitable for products that require performance evaluation under slow temperature changes. Its appearance and structure are similar to low-temperature testing equipment, but it has higher temperature control accuracy and stability.
The different structures and principles of high and low temperature test chambers are suitable for various testing needs, from simulating rapid thermal shock to simulating gradual temperature changes, providing key environmental adaptability assessment methods for product development and quality control. With the advancement of technology, the design of test chambers is becoming increasingly precise and reliable to meet the constantly changing market and technical standards. By gaining a deeper understanding of the purpose and structure of these test chambers, it is possible to better select equipment that is suitable for specific product testing needs, ensuring the reliability and durability of the product under various environmental conditions.
2024-07-24 15:39
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