Multistage thermo-acoustic generator set and multistage heat regenerative refrigeration system provide with same

Abstract

The invention relates to the technical field of thermo-acoustic generator devices, in particular to a multistage thermo-acoustic generator set and a multistage heat generative refrigeration system provided with the same. The multistage thermo-acoustic generator set comprises a plurality of sets of thermo-acoustic engines which are sequentially connected between a compressor and a generator in series. Every two adjacent sets of thermo-acoustic engines are coupled through a harmonic oscillator assembly. The harmonic oscillator assemblies are used for enabling travelling wave sound fields to be formed in the corresponding sets of thermo-acoustic engines simultaneously. Every two adjacent two sets of thermo-acoustic engines are matched well by utilization of one harmonic oscillator assembly. The travelling wave sound fields can be simultaneously formed in the multiple sets of the thermo-acoustic engines, so that the thermoelectric efficiency of the thermo-acoustic generator set is improved. Meanwhile, the working temperatures of the multiple sets of the thermo-acoustic engines are set to be different, and accordingly gradient utilization of different-grade heat energy can be further achieved through the multistage thermo-acoustic generator set, so that the multistage heat regenerative refrigeration system provided with the multistage thermo-acoustic generator set has the higher thermoelectric conversion efficiency.

Description

technical field [0001] The invention relates to the technical field of thermoacoustic generator equipment, in particular to a multistage thermoacoustic generator set and a multistage regenerative refrigeration system with the set. Background technique [0002] A thermoacoustic engine is a new type of power device that converts thermal energy into mechanical energy. If it is connected to a generator, the conversion of mechanical energy into electrical energy constitutes a thermoacoustic generator. Thermoacoustic generator is a kind of external combustion power generation equipment, which can use waste heat, solar energy, industrial waste heat, etc. to generate electricity, so it has a wide range of application prospects. [0003] Existing thermoacoustic engines such as figure 1 As shown, its core components include a main water cooler 1 , a regenerator 2 , a heater 3 , a thermal buffer pipe 4 and a secondary water cooler 5 . When the mechanical energy in the form of sound w...

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Problems solved by technology

Although there is no electro-acoustic conversion process of the compressor in this structure, the efficiency can be improved, but the phase angle of the pressure wave and the volume flow at the generator piston is close to 90° ( figure 1 The corresponding phase angle in the structure is about 60°), which makes the scavenging volume of the generator piston increase several times under the same power generation, which brings great difficulty to the design of the motor, so it is not widely used

[0006] At present, there are also structural forms of acoustic double-acting engines and mechanical double-acting engines. The former resonant tube has large losses and low efficiency, and the latter system has the problem of system instability, so it has not been widely used.

[0007] In summary, existing thermoacoustic generators have disadvantages such as low efficiency and difficult motor matching design; in addition, the temperature of the heater of the current thermoacoustic generator is usually a fixed value, and it is difficult to use heat energy of different temperature grades in stages

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