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Gas distribution piston for small-sized hot-air engine

A technology of gas distribution piston and hot air engine, applied in the field of engine piston, can solve the problems such as the inability to fundamentally solve the problem of piston radiation, heat conduction and conduction heat transfer, increase the amplitude of the temperature gradient, and poor heat conduction performance, and achieve simple structure and reduced heat transfer. Small vertical size, low cost effect

Inactive Publication Date: 2011-05-25
SHANGHAI MICROPOWERS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] 2) The gas distribution piston relies on stainless steel with poor thermal conductivity and sufficient length to ensure the temperature gradient at the upper and lower ends of the gas distribution piston. This method cannot fundamentally solve the radiation heat conduction inside the piston and the conduction heat transfer along the piston wall. For Reducing the heat transfer from the piston crown to the piston seat, increasing the magnitude of the temperature gradient has very limited effect

Method used

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  • Gas distribution piston for small-sized hot-air engine
  • Gas distribution piston for small-sized hot-air engine
  • Gas distribution piston for small-sized hot-air engine

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Embodiment Construction

[0019] figure 1 Shown is the structural diagram of the gas distribution piston of a traditional small heat engine, which is composed of a piston seat 1, a piston body 2 and a piston top 3, the piston body 2 and the piston top 3 are thin-walled cylindrical structures, and the top of the piston top 3 is closed ;The piston body 2 and the piston top 3 are often made of an integral structure, which is stamped from a thin-walled stainless steel plate, or processed from a bar; the piston seat 1 and the piston body 2 are usually fixed by welding, bonding or threaded connection connect. Because the top 3 ends of the gas distribution piston are in direct contact with the heater, the maximum temperature can often reach 500-700°C. Its structural parameters and its own thermal resistance, weight and other performance indicators have a direct impact on the performance of the heater. Therefore, for small The hot air machine needs to meet the following points:

[0020] a) as small a mass as...

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Abstract

The invention provides a distribution piston for a minitype heat engine, comprising a piston seat, a piston body with thin-walled cylinder structure, and an enclosed piston top with thin-walled cylinder structure, wherein, the piston body comprises a plurality of overlapped thin-walled rings with thin-walled cylinder structure, and flaky heat shields are clamped between the piston seat and the thin-walled rings, between the upper and the lower thin-walled rings, and between the thin-walled rings and the piston top. The heat shields are made of ceramic flakes or aluminum foils of poor thermal conductivity. The distribution piston has the characteristics of great vertical heat conduction resistance, great temperature gradients, light weight and simple structure, thereby being very applicable to minitype heat engines below 100W.

Description

technical field [0001] The invention relates to an engine piston, in particular to a gas distributing piston for a small heat engine. Background technique [0002] Heat engine, also known as Stirling engine, is an external combustion engine heated by an external heat source. A traditional heat engine, especially a small heat engine, generally has two pistons, namely a power piston and a gas distribution piston, and the gas distribution piston plays the role of gas distribution. The gas distribution piston is generally composed of a piston top, a piston seat and a piston body, and the piston seat is connected with the gas distribution piston rod. Small-scale heat engines such as those below 1 kilowatt, especially those with a few watts to tens of watts, require compact structure, simple process, and low cost. Set a certain gap between them as a regenerator. In order to improve the efficiency of the heat engine, it is necessary to increase the temperature gradient between th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02G1/043F02G1/053
Inventor 忻晟潘卫明王晓武
Owner SHANGHAI MICROPOWERS
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