Free-piston Stirling heat engine

Abstract

The invention relates to a free-piston Stirling heat engine. The free-piston Stirling heat engine comprises a cylinder body, an evacuator, a power piston and a linear oscillating motor, wherein the evacuator and the power piston are arranged in the cylinder body; the power piston consists of a piston cock body and a piston tenon part, the piston cock body is arranged in the cylinder body, the piston tenon part is connected with a motor rotor of the linear oscillating motor, an expansion chamber is formed between the evacuator and a first end of the cylinder body, a compression chamber is formed between the evacuator and the power piston, and a heat absorption end heat exchanger, a heat regenerator and a heat release end heat exchanger, which are of pipe bundle structures and are not in contact with the cylinder body, are arranged in an outer-side circumference space of the cylinder body. According to the heat engine, the cylinder body at the outer side of the evacuator cannot be subjected to extrusion deformation by the heat regenerator, so that the mechanical damping and air leakage loss of the evacuator are reduced; meanwhile, the room-temperature side temperature of the evacuator can be effectively lowered, so that the phenomenon that the mechanical damping of the evacuator is increased, and even that the evacuator and an air cylinder are stuck, due to heat leakage is avoided; a high-temperature-end heat exchanger, the heat regenerator and a room-temperature-end heat exchanger all adopt small-diameter pipe bundle structures, so that the requirements on materials can be effectively lowered, and the manufacturing cost is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of thermal power, in particular to a free-piston Stirling heat engine. Background technique [0002] The free-piston Stirling heat engine is a special structural form of the thermoacoustic heat engine, which realizes the conversion between external heat and mechanical energy through the efficient Stirling cycle of the internal working medium. The free-piston Stirling engine using the forward Stirling cycle converts external heat energy into mechanical energy by expanding when heated, and compressing when it is cold; the free-piston Stirling refrigerator adopting the reverse Stirling cycle absorbs heat through expansion and releases heat through compression Heat is pumped from the low temperature side to the room temperature side to achieve cooling effect. Whether it is an engine or a refrigerator, the theoretical efficiency of this type of heat engine is equal to the Carnot efficiency. As a thermoacoustic ...

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Problems solved by technology

[0020] The purpose of the present invention is to provide a free-piston Stirling heat engine to simplify the structure of the heat exchanger at the heat release end, the regenerator and the heat exchanger at the heat absorption end, improve the reliability of the system, and reduce the process difficulty and manufacturing cost of the system. And it can overcome the defects of the above-mentioned free-piston Stirling heat engine that the ejector and the ejector cylinder are stuck, the ejector cylinder is deformed, the material of the cylinder body and the manufacturing process are strict, etc.

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