Air filter, internal combustion engine and working machine

Abstract

The invention discloses an air filter, an internal combustion engine and a working machine. The air filter comprises an air filter seat, a shell cover and a filter element, an exhaust gas channel is formed from a second air inlet to an air outlet, and the tail end of the exhaust gas channel at least partially deviates from one side of the filter element adjacent to the exhaust gas channel so as toguide exhaust gas to deviate from the filter element and blow the exhaust gas to the air outlet. During work, the waste gas is blown to the air outlet in the direction deviating from the filter element, is mixed with filtered air in the air outlet area or the adjacent area, then is exhausted and enters other air inlet channels of the internal combustion engine, contact between the waste gas and the filter element when the waste gas is gathered into the air outlet can be effectively reduced, and lubricating oil is prevented from being condensed and gathered on the filter element; and the lubricating oil can be effectively prevented from being attached to the surface of the filter element in the dripping process. The air filter provided by the invention can prevent the filter element from being polluted by the lubricating oil too early in the life cycle to influence the filter effect and the service life of the filter element, and is also beneficial to the participation of the waste gasin combustion work.

Description

technical field [0001] The invention relates to the technical field of internal combustion engines, in particular to an air filter; the invention also relates to an internal combustion engine and a working machine including the above air filter. Background technique [0002] In order to reduce the pollution of engine oil exhaust gas, small internal combustion engines are equipped with exhaust gas circulation system, which will lead the escaped engine oil exhaust gas into the air filter through the exhaust pipe, part of the engine oil exhaust gas is absorbed by the filter element, and part of it is sucked into the air passage due to the negative pressure of the intake air. into the internal combustion engine for combustion again. [0003] Due to the turbulent flow of the oil exhaust gas in the air filter, a considerable part of the oil exhaust gas cannot be sucked into the air passage for combustion again. After the oil condenses, it will flow into the air filter element and ...

AI Technical Summary

Problems solved by technology

[0003] Due to the turbulent flow of the oil exhaust gas in the air filter, a considerable part of the oil exhaust gas cannot be sucked into the air passage for combustion again. After the oil condenses, it will flow into the air filter element and accumulate continuously in the filter element. A big hidden danger, which requires frequent replacement of filter elements, which not only increases the cost of use for customers, but also significantly reduces customer satisfaction

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