A kind of filling method of low temperature heat pipe

Abstract

The invention relates to a low-temperature heat pipe filling method. The method includes the steps of heat pipe vacuuming, heat pipe filling, filling medium replacing, filled heat pipe cold welding, heat pipe section local heating, heat pipe exhausting, heat pipe leakage detection and heat pipe soldering and sealing. According to a low-temperature heat pipe filling process, through the technical schemes of filling medium replacing, vacuuming, heat pipe section local heating and exhausting, the problem of purity of room temperature filling of the low-saturated vapor pressure low-temperature heat pipe working media is solved. The process method is simple in equipment requirement, safe, reliable, convenient to operate and excellent in effect; by means of the filling process, the non-condensate gas amount in the filled low-temperature heat pipe is reduced, the constant temperature performance of the low-temperature heat pipe is improved, the heat transfer capacity of the low-temperature heat pipe is enhanced, the process method is low in implementation difficulty, and the low-temperature heat pipe filling method has engineering application and popularization value and significance.

Description

technical field [0001] The invention relates to a low-temperature heat pipe working medium filling process, in particular to a low-temperature heat pipe working medium filling process with low saturated vapor pressure, belonging to the field of spacecraft heat control. Background technique [0002] At present, low-temperature heat pipes in spacecraft thermal control are mainly used in the fields of surface temperature control of optical loads, heat dissipation of infrared scanning systems, and thermal control of superconducting electromagnetic coils. Low-temperature heat pipe refers to a heat pipe unit that works below 200K. It is a type of heat pipe and is mainly composed of a low-temperature working medium, a capillary structure inside the heat pipe, and a heat pipe shell. The low-temperature working fluid used by the low-temperature heat pipe is generally selected according to the operating temperature range of the low-temperature heat pipe. Usually, the working temperat...

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Problems solved by technology

[0006] At present, the filling process of the aluminum ammonia heat pipe widely used in the field of spacecraft thermal control mainly depends on the vacuuming ability of the equipment and the purity of the ammonia working medium to ensure the purity of the ammonia working medium. The same filling method cannot guarantee the purity of the ammonia working medium. The filling purity of the cryogenic working fluid with saturated vapor pressure is mainly due to the difference in physical properties of the low-temperature working fluid itself

A small part of non-condensable gas that exists during the normal temperature filling process will be magnified tens of hundreds of times in the low-temperature working temperature range, occupying most of the inner space of the low-temperature heat pipe, causing the performance of the low-temperature heat pipe to decay or even fail to work

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