Radiator with double phase change cavities

Abstract

The invention discloses a radiator with double phase change cavities, and belongs to the technical field of heat dissipation and cooling. An upper cavity and a lower cavity of the radiator are vacuum cavities, an upper cover plate is arranged at the top end of the upper cavity, a first packaging opening is formed in the center of the upper surface of the upper cover plate, a lower cover plate is arranged at the bottom end of the lower cavity, and a sandwich plate is arranged between the upper cavity and the lower cavity; the upper surface of the sandwich plate is an evaporation surface of the upper cavity, a second packaging opening is formed in the center of the upper surface of the sandwich plate, and the lower surface of the sandwich plate is a condensation surface of the lower cavity; an evaporation surface, which is in contact with the lower cavity, of the lower cover plate is a reinforced surface, and an evaporation surface, which is in contact with the upper cavity, of the sandwich plate is a reinforced surface; phase change working media are arranged inside the upper cavity and the lower cavity, and the boiling point of the phase change working medium in the lower cavity is higher than that of the phase change working medium in the upper cavity when the vacuum degree of the upper cavity is identical to that of the lower cavity; the vacuum degree of the upper cavity is higher than that of the lower cavity when the boiling point of the phase change working medium in the upper cavity is identical to that of the phase change working medium in the lower cavity. The radiator has the advantages that the radiator is high in heat exchange capacity, the condensation backflow distance can be shortened, the liquid supplementing rate and capacity can be improved, the problem of local hot spots of existing evaporation surfaces can be solved, and application requirements on large inclination angles and high power density can be met.

Description

technical field [0001] The invention belongs to the technical field of heat dissipation and cooling, and in particular relates to a radiator with a dual-phase change cavity. Background technique [0002] At present, power electronic devices such as electronics and optoelectronic chips are gradually tending to high power, miniaturization, high integration, and high frequency, followed by new standards and high requirements for heat dissipation technology. Taking high-power LEDs as an example, nearly 80% to 90% of the input power is converted into heat energy. If the heat cannot be discharged in time, it will seriously affect the light effect and service life of LED lamps. However, the compact structure of power electronic devices only allows a limited heat dissipation space, and requires low noise and low power consumption for heat dissipation, so the traditional air cooling can no longer meet the cooling requirements. The heat dissipation system has become the subject of ex...

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Problems solved by technology

However, due to the problem of the maximum liquid filling rate of the traditional phase change radiator, when working at a large angle, the phase change working medium cannot be returned to the evaporation surface in time, and even the liquid phase change working medium is completely separated from the evaporation surface, resulting in the complete evaporation of the evaporation surface. In the case of dryness, it will eventually lead to the failure of the radiator and seriously affect the reliability of the equipment or even burn the equipment

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