A Rectangular Cylinder Stirling Engine Without Axial Wear

Abstract

A Stirling engine is a unique external combustion engine, as the theoretical efficiency is nearly equal to the maximum theoretical efficiency, the efficiency is called as carnot cycle efficiency, an external combustion engine cylinder in use is filled with a gas working medium of a certain volume and pressure; to ensure high-speed piston straight-line push-pull movement, a medium / high-pressure gas in the cylinder is prevented from leakage for a long time, and a transmission shaft which is connected with an external transmission mechanism is in high-density sealing lubrication and is free of axial mechanical wearing, and therefore, relatively high requirement is provided for structure materials and processes, and further the cost of an engine can be increased and popularization can be affected. The invention discloses an axial-wearing-free rectangular cylinder Stirling engine which is made of a high-performance ceramic material. Due to a planar super-low friction coefficient between ceramics, the lubrication performance approximate to that of an ice surface, and the high temperature resistance, the abrasion resistance, the wearing resistance and the good sealing performance of ceramic, a rectangular piston and a rectangular cylinder are adopted to form planar sealing lubrication, and an axial-wearing-free structure with double-axis lateral planar windowing power output can be formed. The development neck of a conventional Stirling engine shaft to high technical requirements is effectively broken, an external combustion engine with excellent performance can be relatively high in efficiency and relatively long in service life, and can be relatively rapidly popularized and applied in multiple fields of environment-friendly energy and the like.

Description

technical field [0001] The invention belongs to the field of external heat engines, and relates to a rectangular cylinder Stirling engine without axial wear. Background technique [0002] In 1816, the pastor Robart Stirling of London invented an external combustion engine, which could continuously burn various fuels, and the expanded gas evaporated by heat was used as power to move the piston, and the expanded gas was cooled in the air-conditioning chamber repeatedly. The cycle process, so named "Stirling engine". Its characteristics are firstly that it burns continuously, because the working medium does not burn, so there is no knocking phenomenon of the internal combustion engine, and the noise is low; secondly, any fuel can be used, the combustion chamber is outside, and the combustion process has nothing to do with the working medium, and it is suitable for various heat sources. There is no special requirement for the combustion method, small size, light weight, low noi...

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Problems solved by technology

[0004] It has been 200 years since such an excellent engine was invented. In today’s era of energy crisis where fossil energy is gradually exhausted, external combustion engines have not been widely used. Take the Stirling external combustion engine as an example. The four closed cylinders of this machine are filled with hydrogen of a certain volume and pressure as the working medium. One end of the cylinder is a hot chamber and the other end is a cold chamber. The working medium is compressed in the low-temperature cold chamber. , and then flow into the high-temperature hot chamber to rapidly heat and expand to do work. The fuel burns continuously in the combustion chamber outside the cylinder, and is transmitted to the working medium through the heater. Replacement, in order to ensure the high-speed linear push-pull movement of the piston, while the medium-high pressure gas working medium in the cylinder can maintain no leakage for a long time, the friction part of the transmission shaft connected to the external transmission mechanism must be highly sealed and lubricated and almost free of axial wear. Therefore, it is inevitable to put forward higher requirements for structural materials and processes, which will increase the cost of the engine and affect the popularization and promotion.

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