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Piston-free Stirling engine system

A Stirling engine and piston technology, which is applied to machines/engines, hot gas variable capacity engine devices, mechanical equipment, etc. Effects of Radiation Leakage Heat Loss and Acoustic Flow Loss

Inactive Publication Date: 2010-01-06
LIHAN THERMOACOUSTIC TECH SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a free-piston Stirling engine system for the problems in the prior art that the displacer works at the high temperature end, resulting in reduced service life of the displacer and difficulty in sealing the gap between the displacer and the cylinder , Introduce the structure of the heat buffer tube in the free piston Stirling engine, so as to improve the service life of the ejector and reduce the processing and assembly accuracy

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Embodiment Construction

[0019] Before describing the specific implementation of the present invention, the function and working principle of the thermal buffer tube will be briefly explained.

[0020] In a free-piston Stirling engine system, the working principle of the displacer can be expressed by the following formula:

[0021] mx″=P 1 A 1 -P 2 A 2 -Kx-Rx′ (1)

[0022] Among them, m is the mass of the ejector, x is the displacement of the ejector, x' is the first-order derivative of displacement to time, that is, velocity, x" is the second-order derivative of displacement to time, that is, acceleration, P 1 and P 2 are the pressures on both sides of the high temperature end and the room temperature end of the ejector respectively, A 1 and A 2 are the cross-sectional areas on both sides of the high temperature end and the room temperature end of the ejector respectively, K is the elastic coefficient of the elastic member and the gas spring, and R is the damping coefficient. The gas spring r...

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Abstract

The invention discloses a piston-free Stirling engine system comprising a power driving device and a power transmission device, wherein the power driving device comprises an air cylinder and a thermoacoustic converter, and the thermoacoustic converter comprises a high-temperature end heat exchanger, a heat accumulator and a first room-temperature end heat exchanger; the power transmission device comprises an active piston and a first elastic piece far away from one end of the power driving device; the power driving device also comprises a heat buffer tube and an ejector which are sequentially arranged in the air cylinder, wherein the heat buffer tube is positioned on a position corresponding to the high-temperature end heat exchanger which is wrapped on the outer wall of the air cylinder and the heat accumulator; and the ejector is positioned on a position corresponding to the first room-temperature end heat exchanger which is wrapped on the outer wall of the air cylinder in the air cylinder. The invention replaces a part of the ejector, which is higher than a room-temperature end, with the heat buffer tube so that the ejector works in a room-temperature state, thereby enhancing the processing and assembling precision of the ejector and effectively prolonging the service life of the ejector.

Description

technical field [0001] The invention relates to an engine system, in particular to a free-piston Stirling engine system. Background technique [0002] The Stirling engine, also known as a heat engine, generates power through the expansion of the working gas when it is heated and the compression when it is cooled. Its theoretical efficiency is equal to the efficiency of the Carnot cycle. The free-piston Stirling engine is a structural form of the Stirling engine. It cancels the crankshaft structure of the traditional Stirling engine and introduces a "free piston" - or "displacer". By controlling the quality of the displacer And spring stiffness determine its working characteristics, thereby reducing mechanical wear and improving the service life of the engine. Compared with the traditional Stirling engine, the advantages of the free-piston Stirling engine are: higher efficiency, less noise and vibration, and longer life. [0003] figure 1 It is a schematic structural diagr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02G1/043F02G1/053
Inventor 戴巍罗二仓余国瑶吴张华
Owner LIHAN THERMOACOUSTIC TECH SHENZHEN
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