There are two types of heat pipe heat sinks: natural cooling and forced air cooling. The thermal resistance of air-cooled heat pipe heat sinks can be made smaller, and they are often used in power electronics, IGBTs, inverters, transformers, and high-power power supplies.
The heat pipe heat sink consists of a sealed pipe, a liquid wick and a steam channel. The wick surrounds the tube wall of the sealed tube and is immersed in a volatilized saturated liquid. This liquid can be distilled water or ammonia, methanol or acetone. The heat pipe heat sink filled with ammonia, methanol, acetone and other liquids still has a good heat dissipation capacity at low temperatures.
When the heat pipe heat sink is running, its evaporation section absorbs the heat generated by the heat source (power semiconductor device, etc.), so that the liquid in the wick tube boils into steam. The steam with heat moves from the evaporation section of the heat pipe heat sink to its cooling section. When the steam transfers heat to the cooling section, the steam condenses into liquid. The condensed liquid returns to the evaporation section through the capillary action of the wick on the tube wall, and repeats the above-mentioned circulation process to continuously dissipate heat.
The heat pipe heat sink is a high-efficiency heat sink device with unique heat dissipation characteristics. That is, it has high thermal conductivity, and the temperature distribution along the axial direction between the evaporation section and the cooling section is uniform and substantially equal.
The heat pipe heat sink has the following advantages:
① The thermal response is fast, and its ability to transfer heat is more than 1000 times larger than that of copper pipes of the same size and weight;
② Small size and light weight;
③ High heat dissipation efficiency, which can simplify the heat dissipation design of electronic equipment, such as changing air cooling to self cooling;
④ No external power supply is required, and no special maintenance is required during work;
⑤ It has good isothermal properties. After heat balance, the temperature gradient between the evaporation section and the cooling section is quite small, which can be approximately regarded as 0;
⑥ The operation is safe and reliable, and does not pollute the environment.
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