Bifunctional multistage travelling wave thermo-acoustic system

Abstract

The present invention provides a multi-stage double-acting traveling-wave thermoacoustic system, comprising three elementary units, each elementary unit comprises a linear motor and a thermoacoustic conversion device; the linear motor comprises a piston and a cylinder, the piston can perform a straight reciprocating motion in the cylinder; each thermoacoustic conversion device comprises a main heat exchanger and a heat regenerator connected in sequence, and the heat regenerator is of a ladder structure; a set of a non-normal-temperature heat exchanger, a thermal buffer tube and an auxiliary heat exchanger is connected at each ladder of the heat regenerator; and the main heat exchanger and the auxiliary heat exchanger of each thermoacoustic conversion device are connected to cylinder cavities of different linear motors respectively forming a loop structure for flow of a gas medium. The multi-stage double-acting traveling-wave thermoacoustic system can improve the working performance of the multi-stage double-acting traveling-wave thermoacoustic system.

Description

technical field [0001] Embodiments of the present invention relate to energy power and refrigeration cryogenic technology, in particular to a double-acting multi-stage traveling wave thermoacoustic system. Background technique [0002] When the sound wave propagates in the gas, it will cause the pressure, displacement and temperature fluctuation of the propagation medium gas. When this gas interacts with a fixed boundary, it induces a conversion between acoustic energy and thermal energy, which is the thermoacoustic effect. [0003] A thermoacoustic system is an energy conversion system designed using the principle of the thermoacoustic effect, which can convert heat energy into sound wave energy, or convert sound wave energy into heat energy. The thermoacoustic system includes a thermoacoustic engine and a thermoacoustic refrigerator. Among them, the thermoacoustic The engine includes a traveling wave thermoacoustic engine and a Stirling engine, and the thermoacoustic refr...

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Problems solved by technology

[0012] During the research process of the present invention, the inventors found the following technical defects: in the actual application process, the very temperature heat exchanger 23a can only perform heat exchange in a small temperature range, therefore, in this traveling wave thermoacoustic When the system works as an engine, the heat source that supplies heat to the very high temperature heat exchanger 23a has only a small temperature range of heat, which can be utilized by the very high temperature heat exchanger 23a

For example, the working temperature of the very-temperature heat exchanger 23a is in the range of 650°C to 700°C. When the heat source exchanges heat with the very-temperature heat exchanger 23a, only the heat with a temperature between 650°C and 700°C is absorbed. When the temperature of the heat source is low At 650°C, the heat cannot be absorbed, which will cause waste of heat energy and reduce the conversion efficiency of thermoacoustic energy

[0013] In addition, when the traveling wave thermoacoustic system is used as a refrigerator, the traveling wave thermoacoustic system can only provide cooling capacity at one temperature, and cannot obtain a very low cooling temperature, thus limiting the cooling performance of the traveling wave thermoacoustic system

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