Filling method of phase-change material in phase-change heat pipe

Abstract

The invention discloses a filling method of a phase-change material in a phase-change heat pipe, and the phase-change material is octadecane. The filling method is characterized in that the temperature is greater than 90 DEG C when the phase-change material is filled. According to the filling method, the temperature is increased when the phase-change material is filled, the phase-change material is enabled to be in a liquid state, the filling speed of the phase-change material can be increased, and the filling quantity of the phase-change material can be accurately controlled, thereby eliminating adverse effects on the phase-change heat pipe due to over filling or less filling, so that the safety and the reliability of the phase-change heat pipe are guaranteed.

Description

technical field [0001] The invention relates to a filling method of a phase change material of a satellite phase change heat pipe. Background technique [0002] With the development of satellite technology and the continuous expansion of demand, there will be more and more load stand-alone units with intermittent switching, high power, and high heat flux in the future. A single ordinary heat pipe can no longer fully meet the thermal control requirements. Therefore, the use of phase change heat pipes, It is more convenient to realize temperature control on heating equipment. [0003] The phase change heat pipe is composed of a heat pipe and a phase change material. It can not only use the good isothermal property of the heat pipe, but also use the good constant temperature property of the phase change material at the temperature of the phase change point to achieve temperature control for intermittently disconnected equipment. Effect. When the phase change material is used,...

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Problems solved by technology

[0005] For the filling of conventional phase change materials, take 18 alkane as an example (its phase transition point temperature is 28°C), so the temperature during filling is generally 30°C, and 18 alkane is filled into the phase change cavity of the phase change heat pipe as a liquid; but thereafter The phase change heat pipe used for pre-embedding needs to be baked at a high temperature of 90°C for 4 hours, so the volume change rate (thermal expansion coefficient) of the phase change material will seriously affect the safety, reliability and performance of the phase change heat pipe: the filling volume is too large , when the temperature is higher than the phase change temperature, the phase change material melts and the volume increases. Due to the incompressibility of the liquid, the shell will burst due to the huge extrusion force of the liquid when baked at high temperature; if the filling volume is too small, the It will affect the heat absorption and heat release capacity of the phase change heat pipe, which cannot meet the design requirements

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