Highly-integrated crankcase ventilation and separation device

Abstract

The invention discloses a highly-integrated crankcase ventilation and separation device. The highly-integrated crankcase ventilation and separation device comprises a fine separation device and a coarse separation device, and the fine separation device communicates with the coarse separation device through a pipeline; the coarse separation device comprises a coarse separation device body, the coarse separation device body comprises an upper chamber and a lower chamber, the lower chamber is provided with a cylinder body gas taking opening, the upper chamber is provided with a separation labyrinth cavity, the upper chamber communicates with the lower chamber through a coarse separation device gas taking opening, and a coarse separation device gas outlet is formed in the top of the upper chamber. The fine separation device, the coarse separation device and the connecting pipeline jointly form the highly-integrated crankcase ventilation and separation device. Piston blow-by gas is directly led out of the cylinder body, the blow-by gas circulation path is greatly shortened, the temperature drop of the blow-by gas in the circulation process is reduced, and the water vapor condensation risk and the engine oil emulsification risk caused by the water vapor condensation risk are greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of engine crankcase ventilation systems, and in particular relates to a highly integrated crankcase ventilation separation device. Background technique [0002] With the upgrading of emission regulations, the control of engine crankcase emissions is becoming more and more stringent. The crankcase ventilation system of the National VI stage medium and heavy-duty engines generally adopts two-stage separation, including coarse separation and fine separation, to separate the piston blow-by gas. To reduce engine oil consumption and reduce pollution to the atmosphere or the pressure end of the supercharger. [0003] The coarse separation device generally adopts the integrated design of the cylinder head cover, and also adopts the integrated design of the flywheel housing, or directly adopts the external design form. The gas movement direction and the oil return direction in the coarse separation device are general...

AI Technical Summary

Problems solved by technology

In cold regions, the temperature of the piston blow-by gas will drop during the flow process, and once it reaches the freezing point, liquid water will be precipitated, and the liquid water produced will mix with the liquid engine oil particles generated by the splash of the engine, which will easily produce an oil emulsion. Generally, it is milky white or light brown. It is not easy to remove after it is produced. It will pose a serious threat to the engine lubrication system if it accumulates for a long time.

[0009] In the existing design of the crankcase ventilation system, the blow-by gas has a long circulation path, and the thin-walled shell parts such as the flywheel housing and the cylinder head cover that come into contact with during the flow process are all parts of the engine where the temperature is relatively low, so the blow-by gas is very easy to pass through. Condensation on the surface; the external long pipeline is also a part of the engine with a lower temperature

Images