A crankcase exhaust gas treatment system

Abstract

A waste gas treatment system for a crankcase, comprising a crankcase valve chamber cover (1), a ventilation opening (11) provided on the crankcase valve chamber cover (1), an air filter (2), an air filter element (21) provided in the air filter (2), and an oil-water separator (3) provided at the bottom of the air filter (2). The oil-water separator (3) comprises a waste gas inlet (32), a combustible gas mixture outlet (34), a condensing means (33) provided in the oil-water separator (3), and an oil-water settling chamber (31) disposed at the bottom of the oil-water separator (3). The waste gas inlet (32) is located above the oil-water settling chamber (31), and a drain outlet (311) is provided at the bottom of the oil-water settling chamber (31). A ventilation corrugated pipe (12) is provided between the waste gas inlet (32) and the ventilation opening (11). Waste gas of the crankcase sequentially passes through the ventilation corrugated pipe (12) and the oil-water separator (3), and then a combustible gas mixture is obtained. The combustible gas mixture enters an inlet gas combustion system through the air filter element (21). By means of the apparatus, waste engine oil vapor and water vapor in the waste gas of the crankcase can be converted into liquid and discharged before entering the inlet gas combustion system, thereby avoiding pollution of the waste gas of the crankcase to the inlet gas combustion system and a tail gas purifying system.

Description

technical field [0001] The invention relates to the technical field of auto parts, in particular to a crankcase exhaust gas treatment system. Background technique [0002] When the engine is working, exhaust gas will be generated in the crankcase. This exhaust gas has three main components: combustible mixture HC and water vapor H. 2 O, and when the engine operating temperature reaches 85-95°C, the unstable molecules in the mist oil in the crankcase will also volatilize and mix in the exhaust gas. In order to reduce the pressure in the crankcase, make the engine seals not leak oil, reduce the pollution of the exhaust gas to the engine oil, and keep the oil from deteriorating, it is necessary to suck the exhaust gas into the intake combustion system of the engine for secondary combustion, and then pass through the exhaust gas purification system. Discharged in the air after purification. [0003] Under the action of the pressure released in the crankcase and the suction of ...

AI Technical Summary

Problems solved by technology

[0004] As attached in the manual figure 1 In the crankcase exhaust gas treatment system shown, the crankcase exhaust gas directly enters the intake manifold through the crankcase ventilation pipe 14, and part of the exhaust gas from the crankcase 1 is forced into the intake manifold 4 through the PCV valve 15, and finally enters the intake manifold. In the combustion system, since the exhaust gas contains waste engine oil and water, it will adhere to the throttle valve 5 and the wall of the intake manifold when it enters the intake manifold 4, forming a layer of mucous membrane. When there is dust, it will adhere to it, and as the use time prolongs, a layer of sludge will be formed, and it will become thicker and thicker, which will affect the sensitivity of the intake pressure sensor 41; when the exhaust gas enters the combustion chamber through the high-temperature intake valve , the engine oil vapor in it will crack and form hard carbon deposits when it encounters high temperature, and the water vapor will hinder the normal combustion of fuel; due to the slow combustion speed of engine oil, the unburned waste engine oil gas enters the exhaust gas purification system. If the temperature is higher (400-600°C), it can still cause the oil cracking reaction to generate hard carbon deposits, which will block the ceramic micropores of the oxygen sensor and the three-way catalytic converter, resulting in insufficient engine power, increased fuel consumption, excessive exhaust emissions, and maintenance. cost increase, etc.

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