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A kind of filling method of low temperature heat pipe

A technology of heat pipe and low temperature, which is applied in the field of spacecraft thermal control, can solve the problems of not being able to guarantee the filling purity of low-temperature working fluid, occupying the space in the low-temperature heat pipe tube, and attenuating the performance of low-temperature heat pipe, so as to solve the problem of filling purity and increase the limit Heat transfer capability, smooth start-up effect

Active Publication Date: 2016-11-30
SHANGHAI LIZHENG SATELLITE APPL TECH CO LTD
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AI Technical Summary

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

Method used

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  • A kind of filling method of low temperature heat pipe

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Embodiment 1

[0026] (1) Install the heat pipe to be filled on the filling equipment, and the inner diameter of the filling hole of the heat pipe to be filled shall not be less than 3mm;

[0027] (2) Turn on the vacuum pump of the equipment, evacuate the heat pipe to be filled until the vacuum degree reaches the order of 10Pa, close the vacuum valve of the heat pipe, open the filling valve, fill in 3-5g of propane working fluid and let it stand for 3 minutes;

[0028] (3) Open the vacuum valve of the heat pipe, directly extract the filled propane working medium, and continue to vacuumize to the order of 10Pa, and then repeat steps (2) and (3);

[0029] (4) After repeating 3 times, fill in the theoretical filling amount M+5g of low-temperature working fluid, then cold weld and seal, and use a 40°C warm water bath to soak for leak detection;

[0030] (5) Submerge the heat pipe that has been replaced and filled vertically in a warm water bath with a depth of 300 mm and a depth of 40 ° C. After...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28D15/02
Inventor 赵小翔周日海陈辉侯振压陶莉
Owner SHANGHAI LIZHENG SATELLITE APPL TECH CO LTD
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