Thermoacoustically-driven thermally-coupled two-stage pulse tube cooling system

Abstract

The invention discloses a thermoacoustically-driven thermally-coupled two-stage pulse tube cooling system, which comprises a U-shaped double side-drive thermoacoustic engine, connecting pipes and a thermally-coupled two-stage pulse tube cooler, which are connected sequentially. The system is characterized in that: a U-shaped resonating tube connects two thermoacoustic cores; acoustic power flows flow out from the directions of a cold end and a hot end of a thermoacoustic plate stack to drive an acoustic oscillator and the pulse tube cooler in the U-shaped resonating tube respectively; the backward pressure waves output by the two thermoacoustic cores drive the two stages of the thermally-coupled two-stage pulse tube cooler through the connecting pipes respectively, the pulse tube cooler is connected to the pressureantinode positions on the two ends of the thermoacoustic engine, and a larger output pressure ratio is favorable for the acquisition of optimal lower cooling performance of the pulse tube cooler; the operation method of combining the thermoacoustic plate stack and a thermoacoustic regenerator is adopted to improve the acoustic power output capacity and the vehicle efficiency; and a liquid piston is introduced into the U-shaped resonating tube to form a gas-liquid coupled oscillation system so as to reduce resonance frequency and increase pressure ratio and consequentially improve the performance of the driven pulse tube cooler.

Description

technical field [0001] The invention relates to a heat-driven refrigeration device, in particular to a low-temperature refrigeration device driven by a thermoacoustic engine. Background technique [0002] The thermoacoustic-driven pulse tube refrigeration system is a heat-driven refrigeration system that uses a thermoacoustic engine (also called a thermoacoustic compressor) to drive a pulse tube refrigerator to obtain a cooling effect. The thermoacoustic engine generates self-excited oscillation of the working medium under the drive of heat energy, that is, converts heat energy into sound work, and outputs it in the form of pressure waves; the pulse tube refrigerator consumes the sound work transmitted by pressure waves to achieve heat pumping and obtain cooling effect. Since the thermoacoustic driven pulse tube refrigeration system is only composed of heat exchangers and pipes, and does not include mechanical moving parts such as cranks, connecting rods, and pistons, it has...

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Problems solved by technology

In addition, the problem of thermal expansion in the loop structure also needs to be carefully considered and resolved, otherwise it will cause distortion or even destruction of the structure

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