? Dongfanghong No.1? Satellite, the first man-made earth satellite launched by China, was successfully launched at Jiuquan Satellite Launch Center on April 24th, 197, thus creating a new era in China's space history, making China the fifth country in the world to independently develop and launch man-made earth satellites after the Soviet Union, the United States, France and Japan.

? Dongfanghong No.1? The satellite consists of structure, temperature control, energy, music device of Dongfanghong, short-wave telemetry, tracking, antenna subsystem and attitude measurement components, etc. Its main task is to carry out satellite technology experiments and detect the density of ionosphere and atmosphere. Due to the limited battery life, the satellite runs out of batteries after 28 days (the design life is 2 days). During this period, the satellite transmitted telemetry parameters and various space exploration data back to the ground. May 14th, 197? Dongfanghong No.1? The satellite stopped transmitting signals, the music of Dongfanghong stopped playing, and the satellite ended its working life.

? Dongfanghong No.1? The satellite instrument cabin is cylindrical and installed in the middle of the satellite. A sealing ring is installed at the joint between the cabin cover and the chassis to ensure the sealing of the instrument cabin. The instrument cabin base is the main load-bearing structural part of the satellite, and it is also an important part connecting the satellite with the launch vehicle. It not only bears the weight of the satellite itself, but also bears the thrust of the launch vehicle during the launch process. According to? 651? The general arrangement of the task is that the Institute of Chemistry of Chinese Academy of Sciences is responsible for the development of the base of the satellite instrument cabin and the sealing ring for the satellite.

when the satellite is in orbit, the surface temperature of the satellite can reach more than 1 degrees Celsius under the action of direct sunlight, earth thermal reflection and infrared radiation heating. When the satellite is in the shadow area of the earth and is not heated by the sun and the earth's reflection, the surface temperature of the satellite can be reduced to more than 1 degrees Celsius below zero. In this situation of intense alternation of hot and cold, the instruments and equipment on the satellite will not work normally or even be damaged. Therefore, appropriate temperature control measures must be taken to ensure a normal working temperature environment in the satellite instrument cabin. ? ?