Coupled apparatus used between heat phonomotor and refrigerating device driven by the same

Abstract

The invention relates to a coupling device for a thermoacoustic engine and a refrigerator driven by it, comprising: a cavity; an elastic diaphragm installed in the cavity, and the elastic diaphragm divides the cavity into first chambers and the second chamber; a long tube communicated on one side wall of the cavity and communicated with the first chamber; a short tube communicated on the other side wall of the cavity and communicated with the second chamber; The other end is connected to the feedback tube of the thermoacoustic engine; the other end of the short tube is connected to the water cooler of the refrigerator; the coupling device can amplify the pressure amplitude of the pressure wave generated by the thermoacoustic engine after passing through the long tube and the cavity, Thereby, the utilization rate of the sound power of the system by the refrigerator is improved; the elastic diaphragm sandwiched in the middle of the cavity isolates the working gas in the engine and the refrigerator, so that the engine can use nitrogen and other gases as the working fluid to reduce the system frequency, and the refrigerator can use helium. Gas and other gases are used as working fluids to maintain their good refrigeration performance.

Description

field of invention [0001] The present invention mainly relates to the field of energy utilization and refrigeration, in particular to a coupling device used between a thermoacoustic engine and a refrigerator driven by it; the coupling device can improve the utilization rate of sound power of the refrigerator system driven by a thermoacoustic engine, Reduce operating frequency. Background technique [0002] The thermoacoustic engine-driven pulse tube refrigerator, or thermoacoustic refrigerator, is a new type of refrigeration technology that has no moving parts at all. It uses thermal energy as power, through the oscillation of gas, converts internal energy into sound work in the engine, and consumes sound work in the refrigerator to produce cooling effect. It is environmentally friendly, safe, and has a long service life, so it has a very good application prospect. [0003] At present, its refrigeration temperature range has covered from room temperature to liquid hydrogen ...

AI Technical Summary

Problems solved by technology

First, pulse tube refrigerators and thermoacoustic refrigerators usually use gases such as helium as the working medium, and it is advisable to work at a relatively low frequency. When the operating frequency increases, its refrigeration performance usually deteriorates

When the thermoacoustic engine uses helium as the working medium, if it is to make it work at a frequency below 50Hz, the length of the resonance tube must reach more than 8m. Such a huge volume is of course not conducive to practical application, and it will also consume a lot of The cost of helium is also very high

Second, due to the large size of the thermoacoustic engine, if the refrigerator and the engine are directly coupled, the pressure amplitude in the refrigerator cannot be higher than the pressure amplitude in the engine, so the engine will consume most of the energy due to viscous dissipation. Part of the sound work, only a small amount of sound work enters the refrigerator, so the efficiency is very low

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