A free piston Stirling heat engine

Abstract

The invention provides a free piston Stirling heat engine. The Stirling heat engine comprises a plurality of Stirling engines and a plurality of linear oscillation motors; and any Stirling engine comprises an exhaust device (4) and is characterized in that each exhaust device (4) comprises an upper piston body (4-1), a lower piston body (4-2), tenon parts (4-3), plane supporting plate springs (4-4), high-temperature barrels (4-5), a cavity (4-6), a base (4-7), a step type cylinder (4-8) and steps (4-9). According to the free piston Stirling heat engine, gas springs are utilized to reduce the rigidity of the plate springs, it can be guaranteed that gaps between the exhaust devices and the cylinders are sealed through the plane supporting plate springs, and design, materials and technology difficulty of the plane supporting plate springs are also reduced; a dual-piston-body structure is adopted for each exhaust device, each upper piston body and the corresponding lower piston body are assembled on the two sides of the two corresponding sets of plane supporting plate springs, the technology and assembly difficulty is reduced, reciprocating vibration of the exhaust devices is made more stable, the reliability of the system is improved, and the service life of the system is prolonged.

Description

technical field [0001] The invention relates to thermal power technology, in particular to a free-piston Stirling heat engine. Background technique [0002] Free-piston Stirling heat engine is a structural form of thermoacoustic heat engine. It uses an ejector to replace the crankshaft structure in the traditional Stirling heat engine, and adjusts the phase distribution of the sound field by controlling the dynamic mass of the ejector and the stiffness of the leaf spring to achieve efficient thermal-acoustic or acoustic-thermal conversion, and through impedance matching and sound field The coupling method realizes efficient coupling with the linear motor or linear compressor, and constructs a free-piston Stirling generator or an electric-driven free-piston Stirling refrigerator. The Stirling engine using the forward Stirling cycle absorbs heat through the high-temperature heat exchanger, releases heat through the room temperature heat exchanger, and realizes the conversion ...

AI Technical Summary

Problems solved by technology

figure 1 In the structure shown, the falcon part of the ejector is coupled with the linear motor, and the power piston supporting leaf spring is placed in the back cavity of the motor. This structure reduces the design difficulty of the planar leaf spring and is easy to achieve a large diameter-to-axis stiffness ratio, but the discharge The falcon part of the device is a slender rod. Because of the gap seal between it and the power piston, it requires high precision in design, processing and assembly, and there are structural instability factors because of the unbalanced force on both sides.

figure 2 In the structure shown, the ejector supporting leaf spring 11 is placed inside the ejector, and the falcon part of the ejector is integrated with the ejector base 12. This structure eliminates the disadvantage that the ejector's falcon part is long and easily deformed and unstable, but The size of the ejector supporting leaf spring is restricted by the size of the ejector, which significantly increases the difficulty of design, material, and processing technology, and its reliability is also affected

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