Combustion chamber and diesel engine

Abstract

The combustion chamber comprises a combustion chamber pit located at the top of a piston, and an annular flange protruding towards an oil nozzle is arranged on the circumferential wall face of the combustion chamber pit. The bottom of the combustion chamber pit comprises a rotary central protrusion protruding upwards and an annular pit surrounding the central protrusion in the circumferential direction, and the peripheral diameter of the central protrusion is gradually decreased in the direction of the upward protrusion. The outer circumferential face of the central protrusion comprises a first flow guide circumferential face, a flow guide step face and a second flow guide circumferential face which are sequentially connected from the bottom of the combustion chamber to the top of the central protrusion. According to the scheme, the flow guide circumferential face and the flow guide step face are designed on the periphery of the central protrusion, so that mixed gas forms secondary jet flow, an air interlayer is formed on the surface of the central protrusion, and therefore adhesion combustion of high-temperature fuel gas on the surface of the central protrusion is reduced, heat transfer loss in a cylinder is reduced, heat efficiency of an engine is improved, and oil consumption of the engine is reduced.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a combustion chamber and a diesel engine. Background technique [0002] Please refer to figure 1 , in order to better mix the oil beam and the air in the combustion chamber of the diesel engine, the existing diesel engine combustion chamber usually includes an ω-shaped combustion chamber pit structure designed on the top of the piston. Specifically, the ω-shaped combustion chamber pit structure The center of the bottom is designed with a generally conical central convex structure 01 protruding upward, and the circumferential side wall of the combustion chamber pit is designed with a radially inwardly protruding annular flange at the position close to the upper top surface 04 of the piston. Structure 02. When the diesel engine is working, the fuel is injected from the injection hole of the injector at a high pressure and at a high speed. Under the action of the air resistance in...

AI Technical Summary

Problems solved by technology

Among them, the mixed gas formed after the downward moving oil jet is mixed with air will continue to go up along the conical surface of the central raised structure 01 at the bottom of the combustion chamber pit under the action of the oil jet’s own kinetic energy and air flow, resulting in the combustion process The high-temperature gas in the cylinder has been in contact with the conical surface of the central raised structure 01, which will cause the heat in the cylinder to transfer to the piston and the cooling oil chamber inside the piston, resulting in a large heat transfer loss, reducing the thermal efficiency of the engine and reducing the fuel economy of the engine. sex

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