A Multiple Boiling Exhaust Method Applicable to Pulsating Heat Pipes

Abstract

The invention discloses a multi-boiling exhausting method suitable for a pulsating heat pipe. All liquid is drained and all air is exhausted through multi-boiling operation, the high vacuum degree is acquired, accurate liquid filling is conducted, in other words, the pulsating heat pipe is heated, part of air in the pipe is exhausted from a liquid filling exhausting port, the pulsating heat pipe is cooled, air in the pipe is condensed, part of a liquid working medium is sucked, the liquid working medium of the pulsating heat pipe is reheated to be boiled, the liquid working medium is reversely poured to a liquid reservoir filled with the working medium, and the pipe is filled with steam of the liquid working medium. The volume of the pipe is checked through the liquid reservoir, a proper quantity of the liquid working medium is re-injected into the pulsating heat pipe, and the liquid filling rate of the pulsating heat pipe is accurately controlled. The high vacuum degree is acquired without expensive equipment, the liquid filling rate is accurately controlled through the volume checking function, production and manufacturing cost is greatly reduced, the vacuum degree is increased, and the control accuracy is improved.

Description

technical field [0001] The invention relates to the field of heat pipe manufacturing, in particular to a multiple boiling exhaust method suitable for pulsating heat pipes. Background technique [0002] Vacuum degree and liquid filling rate are important factors affecting the performance of heat pipes. Among them, the higher the vacuum degree, the less condensable gas in the tube, and the better the heat transfer performance and isothermal performance of the heat pipe [Hu Zhonghai et al., Experimental research on the effect of vacuum degree on the performance of micro heat pipes, Modern Manufacturing Engineering, 2013]. There are two main ways to realize the vacuum degree: vacuum filling method and boiling exhaust method after filling liquid. The vacuum pumping liquid filling method depends on the vacuum machine, and the performance of the vacuum machine directly affects the vacuum degree of the heat pipe. The boiling exhaust method after liquid filling is to make the steam...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problem that the vacuum degree of the conventional vacuum pumping and liquid filling method is not high enough, gets rid of the dependence on the vacuum machine, and combines the characteristics of the gas-liquid intermittent distribution of the pulsating heat pipe, proposes a simple and efficient method of exhausting and filling liquid, that is, multiple times of boiling and discharging All liquid and air, and the steam in the tube is accurately filled after high vacuum, and the volume check function is provided

Images