Supercritical heat waves heat-transfer element and its working medium loading sealing method

Abstract

The invention provides a supercritical heat wave heat transfer element, comprising at least one cavity body capable of being sealed and at least one working medium, wherein, the working medium is bulked into the cavity body capable of being sealed, the cavity body capable of being sealed is sealed, the sum of the liquid volume of the bulked working medium is less than the total cavity volume; at least one part of the cavity body is a heat absorbing end, at least the other part of the cavity body is a heat discharging end; the heat transfer element absorbs the heat quantity from the heat absorbing end. When the working medium in the cavity body is in a subcritical and/or supercritical state, the supercritical flow body inside the cavity body transfers the heat quantity to the radiating end from the heating absorbing end mainly in a way of heat wave in order to realize the heat energy transfer because the supercritical working medium has low thermal diffusivity and high thermal expansivity near a critical point and/or an imitated critical point.

Description

technical field [0001] The invention relates to a heat transfer element, especially an element using supercritical fluid to conduct heat transfer inside a closed cavity, and its filling and sealing method. Background technique [0002] Supercritical fluid (SCF) refers to the fluid whose thermodynamic state is above the "critical point"; that is, the fluid above the critical temperature and critical pressure. The supercritical fluid has the dual characteristics of liquid and gas, with high density, large diffusion coefficient and low viscosity. , Good permeability; the physical and chemical properties of the fluid near the critical point are extremely sensitive to changes in temperature and pressure, and the fluid properties can be adjusted by pressure without changing the chemical composition. Supercritical fluid technology has emerged since the 1970s. With its significant advantages such as environmental protection and high efficiency, it easily surpasses traditional techno...

AI Technical Summary

Problems solved by technology

[0005] 1. The manufacturing methods of heat pipes can be divided into two categories. One is the vacuum method, which requires vacuum equipment, which consumes energy and time. The second is the heat exhaust method, which cannot accurately control the amount of working medium. It is limited to Manufacture of industrial heat pipes

[0006] 2. The sealing technology adopts the cold welding method for the vacuum pumping method. The only material that can be sealed by the cold welding method is copper. Other metals are not suitable for this method, which limits the use of high-cost copper as the shell material for the heat pipe. Therefore, Increased the cost of the heat pipe; In addition, for the heat exhaust method, due to the use of pins driven into the seal and then additional welding technology, the process cannot guarantee the overall quantity of working medium, quality and performance, and the main problem of this method The reason is that this method can only be used to produce large pipe fittings, and small pipe fittings cannot be produced at all.

[0007] 3. Internal anti-corrosion problem: The working medium used may react with the material of the cavity, which reduces the vacuum degree, thus reducing the performance of the heat pipe, resulting in failure to work in the end, so the life of the heat pipe is short and cannot be suitable for industrialization requirements.

[0008] Due to the technical defects of the existing heat pipe technology, the development of the heat pipe technology is hindered, and the heat pipe technology cannot be widely used.

Images