Scavenging structure of free piston engine

Abstract

The invention discloses a scavenging structure of a free piston engine. The scavenging structure comprises a cylinder and an exhaust passage, and further comprises a left scavenging passage and a right scavenging passage, wherein the exhaust passage is arranged on the cylinder; and the left scavenging passage and the right scavenging passage are symmetric to the diameter line of the cylinder, areinclined in the direction far away from the exhaust passage, and are inclined towards the top of the cylinder. The scavenging structure has the beneficial effects that by the adoption of the symmetricscavenging passage arrangement mode, the reasonable distribution of scavenging gas flow can be achieved; the left scavenging passage and the right scavenging passage are inclined in the direction faraway from the exhaust passage, so that the circumferential flowing of the scavenging gas flow can be achieved through such a circumferential-flow scavenging passage structure; and the left scavengingpassage and the right scavenging passage are inclined towards the top of the cylinder, so that the purpose of adopting such an inclined structure for the scavenging passages can be fulfilled, an upward gas flow component can be achieved, and the perpendicular flowing of the gas flow can be achieved.

Description

technical field [0001] The invention relates to the technical field of free-piston engines for range-extending new energy vehicles, in particular to a free-piston engine scavenging structure. Background technique [0002] Energy consumption, environmental pollution and global warming are the environmental problems faced by human beings all over the world. As an emerging free-piston engine, it has the advantages of small size, light weight and high thermal efficiency, which improves the fuel utilization efficiency to a certain extent. However, ordinary free piston engines have an obvious shortcoming in the process of scavenging: the piston stroke of free piston engines is not fixed, sometimes it can reach the top dead center and bottom dead center, and sometimes it cannot reach the position, so the ordinary scavenging structure It will cause the scavenging process to be incomplete, cause the relative position of the piston and the scavenging port to change, and affect the sc...

AI Technical Summary

Problems solved by technology

However, ordinary free piston engines have an obvious shortcoming in the process of scavenging: the piston stroke of free piston engines is not fixed, sometimes it can reach the top dead center and bottom dead center, and sometimes it cannot reach the position, so the ordinary scavenging structure It will cause incomplete scavenging process, cause the relative position of piston and scavenging port to change, and affect the scavenging process

[0003] A simple analysis of the situation that the ordinary free piston cannot reach the top dead center position, the piston stroke is 38mm 2 、36mm 2 and 34mm 2 , it is found that as the stroke of the piston decreases, the mass fraction of oxygen in the cylinder decreases, that is, the scavenging process in the cylinder becomes significantly weaker.

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