Satellite travelling-wave tube thermovacuum testing system

Abstract

The invention provides a satellite travelling-wave tube thermovacuum testing system which comprises a vacuum vessel, wherein the vacuum vessel is internally provided with a travelling-wave tube platform which is fixedly arranged on an elevating mechanism; the travelling-wave tube platform is of a hollow cavity structure; the cavity is internally provided with a heat exchange tube; the heat exchange tube is connected with a refrigerating unit through a coolant pipeline; and the refrigerating unit is positioned outside the vacuum vessel. According to the satellite travelling-wave tube thermovacuum testing system provided by the invention, a travelling-wave tube exchanges heat with the travelling-wave tube platform through a heat conduction mode, so that the heat exchange efficiency between the travelling-wave tube platform and a test piece is greatly improved, The travelling-wave tube cooling time is reduced, and one technical problem in a satellite travelling-wave tube thermovacuum testing process is solved.

Description

technical field [0001] The invention relates to a simulation test system, in particular to a satellite traveling wave tube thermal vacuum test system. Background technique [0002] The satellite traveling wave tube is one of the important components in the satellite star. The thermal vacuum test is carried out on it, mainly to simulate the vacuum of space, cold darkness and the environment of solar radiation. The existing simulation test system mainly consists of a vacuum container, a heat sink , vacuum pumping, refrigerant supply, infrared heat flow, equipment measurement and control and other sub-systems, the vacuum container is the main body of the system, and the high vacuum pumping unit can make it better than 1.3×10 -3 The vacuum degree of Pa, the heat sink placed in the vacuum container is an important part of the vacuum test system of the thermal component. After the low-temperature refrigerant is used, the temperature of the entire heat sink is kept below -75°C to ...

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Problems solved by technology

[0002] The satellite traveling wave tube is one of the important components in the satellite star. The thermal vacuum test is carried out on it, mainly to simulate the vacuum of space, cold darkness and the environment of solar radiation. The existing simulation test system mainly consists of a vacuum container, a heat sink , vacuum pumping, refrigerant supply, infrared heat flow, equipment measurement and control and other sub-systems, the vacuum container is the main body of the system, and the high vacuum pumping unit can make it better than 1.3×10 -3 The vacuum degree of Pa, the heat sink placed in the vacuum container is an important part of the vacuum test system of the thermal component. After the low-temperature refrigerant is used, the temperature of the entire heat sink is kept below -75°C to simulate the cold and dark space environment where the internal components of the satellite are located; the infrared heat flow heating device is installed between the heat sink and the test piece to simulate the sun’s impact on the satellite. The irradiated heat flow of the components can increase the surface temperature of the specimen to 120°C; during the thermal vacuum simulation test, the environmental vacuum of the heat sink and the satellite traveling wave tube is generally better than 1.3×10 -3 Pa, therefore, heat is exchanged between them in the form of heat radiation. The test proves that even if the existing simulation test device changes the -75°C refrigerant into the heat sink into liquid nitrogen (-196°C), the heating power cannot be reduced. The 70W traveling wave tube dropped from the +70°C high temperature heat soak zone to the -35°C low temperature heat soak zone in less than 4 hours, which could not meet the test technical requirements of less than 4 hours for cooling

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