Lengthened piston mechanism for visual optical engine device

Abstract

The invention aims to provide a lengthened piston mechanism for a visual optical engine device. The lengthened piston mechanism for the visual optical engine device comprises a cylinder cover, a lengthened piston, an original piston and a cylinder body. A lower cover plate is fixed to the cylinder body. A lengthened supporting column is supported between the cylinder cover and the lower cover plate. A quartz cylinder jacket and a metal cylinder jacket are arranged below the cylinder cover in sequence. The upper end of the lengthened piston is located in the metal cylinder jacket, and the lower end of the lengthened piston is connected with the original piston. According to the lengthened piston mechanism for the visual optical engine device, the piston cover and a main part of the lengthened piston are connected through a thread structure, the pretightening force of threaded connection makes the connection surface of the piston cover and a transparent window have sufficient tightness, the problems of poor sealing and air leakage between the transparent window and the pistons are solved, and the compression ratio can be changed by changing the thicknesses of sealing gaskets, so that the measurement requirements under different compression ratio conditions are met; and meanwhile, four gas rings are adopted, and a graphite coating is adopted for a piston ring so that abrasion of the cylinder jackets can be reduced, the portion between the gas rings and the cylinder body is coated with grease, and thus lubricating and sealing effects are achieved effectively.

Description

technical field [0001] The invention relates to an engine, in particular to a piston mechanism of the engine. Background technique [0002] The optical engine is a visual engine, using different optical testing methods such as high-speed photography, Raman scattering, laser-induced fluorescence, particle image velocimetry (PIV), etc., to obtain the fuel spray in the engine cylinder, the movement in the cylinder, and the formation of the mixture in the cylinder , temperature field, concentration field, velocity field, combustion and emission generation, etc., provide a visualized research platform for the closed combustion chamber space, and have guiding significance for the combustion design and optimization of the engine. At present, foreign research organizations and institutions have set up visual test platforms for optical engines, which have played a positive role in the structural design of engines and the development of combustion theory. Domestic research in this are...

AI Technical Summary

Problems solved by technology

The technical solution of the orifice ensures that the transparent window will not slip out from the upper end of the top part, but the influence of the shape of the combustion chamber on the spray and the mixing process of the mixed gas cannot be observed

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