WO2017088343A1

WO2017088343A1 - Waste gas treatment system for crankcase

Info

Publication number: WO2017088343A1
Application number: PCT/CN2016/078802
Authority: WO
Inventors: 王永勤
Original assignee: 王永勤
Priority date: 2015-11-26
Filing date: 2016-04-08
Publication date: 2017-06-01
Also published as: CN105464747A; CN105464747B

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

Crankcase exhaust gas treatment system

The present application claims priority to Chinese Patent Application No. 201510859565.X, entitled "Crankcase Exhaust Gas Treatment System", filed on November 26, 2015, the entire contents of which is incorporated herein by reference. In the application.

Technical field

The invention relates to the technical field of automobile parts, in particular to a crankcase exhaust gas treatment system.

Background technique

Exhaust gas is generated in the crankcase under the working condition of the engine. The main components of this exhaust gas are: the combustible mixture HC and the water vapor H2O, and the mist oil in the crankcase when the engine operating temperature reaches 85-95 °C. The unstable molecules also volatilize and are mixed in the exhaust gas. In order to reduce the pressure in the crankcase, the engine seals do not leak oil, reduce the pollution of the exhaust gas to the oil, so that the oil does not deteriorate, and the exhaust gas needs to be sucked into the engine's intake combustion system for secondary combustion, and then passed through the exhaust gas purification system. After being purified, it is discharged into the air.

Under the pressure released by the crankcase and the suction of the intake system, the combustible mixture in the exhaust gas, water vapor and the misty and unstable oil molecules in the crankcase are taken into the intake combustion system and exhaust of the engine. The purification system caused pollution of the two systems, namely sludge and carbon deposits. For the time being, the accumulation of carbon in an ignition-type gasoline engine is like a cancer in a car, and it is a common problem.

The crankcase exhaust gas in the crankcase exhaust gas treatment system shown in FIG. 1 of the specification enters the intake manifold directly through the crankcase ventilation pipe 14, and part of the exhaust gas of the crankcase 1 is also forcedly sucked into the intake manifold through the PCV valve 15. Finally, entering the intake combustion system, because the exhaust gas contains waste engine oil and water, entering the intake manifold 4 will adhere to the throttle 5, the intake manifold wall, forming a layer of mucosa, when encountered from the air filter When the unfiltered dust of the cleaner is adhered to it, a layer of sludge is formed as the use time is extended, and it becomes thicker and thicker, which affects the sensitivity of the intake pressure sensor 41; when the exhaust gas passes through the high temperature The intake valve enters the combustion chamber, and the oil vapor in the high temperature will crack and form hard carbon deposit. The water vapor will hinder the normal combustion of the fuel; due to the slow burning speed of the oil, the unburned waste oil will enter the exhaust gas. In the purification system, due to the high temperature of the exhaust gas purification system (400-600 ° C), the oil cracking reaction can still be used to generate hard carbon deposits. The ceramic micropores that block the oxygen sensor and the three-way catalyst cause insufficient engine power, increased fuel consumption, excessive exhaust emissions, and increased maintenance costs.

Summary of the invention

The technical problem to be solved by the present invention is to provide a crankcase exhaust gas treatment system capable of sufficiently purifying crankcase exhaust gas to prevent engine carbon deposition, which can remove waste engine oil vapor and water vapor in crankcase exhaust gas, thereby avoiding crankcase The exhaust gas pollutes the intake combustion system and the exhaust gas purification system, and makes the combustion more fully, which improves the engine's power and reduces harmful gas emissions.

In order to solve the above technical problem, the present invention provides a crankcase exhaust gas treatment system including a crankcase valve chamber cover, a vent provided on the crankcase valve chamber cover, an air cleaner, and the An air filter in the air cleaner and a water separator disposed at the bottom of the air cleaner; the oil water separator includes an exhaust gas inlet, a combustible mixture outlet, a condensing device disposed inside the oil water separator, and a chamber An oil-water sedimentation chamber at the bottom of the oil-water separator, the exhaust gas inlet is located above the oil-water sedimentation chamber, a drain outlet is arranged at the bottom of the oil-water sedimentation chamber, and a ventilation bellows is arranged between the exhaust gas inlet and the vent; After the crankcase exhaust gas passes through the ventilation bellows and the oil-water separator in turn, the waste engine oil vapor and water vapor are converted into liquid liquid discharged through the oil-water sedimentation chamber and the sewage outlet, and the combustible mixed gas (main component HC) obtained is obtained. The air filter enters the intake combustion system.

Optionally, the ventilation bellows is characterized by a corrugated shape and has a length ranging from 40 to 80 cm.

Optionally, the ventilation bellows is inclined upward from the venting port extending the crankcase exhaust gas outflow direction.

Optionally, the oil water separator is disposed at the bottom of the air cleaner.

Compared with the prior art, the invention has the beneficial effects that the invention utilizes the crankcase exhaust gas through the ventilation bellows to the oil-water separator, and skillfully utilizes the oil vapor, the water vapor and the combustible mixture (the main component is HC) The molecular activities of the three gases are different and the temperature required for the conversion to liquid is different. After the condensation of the ventilation bellows and condensation, the waste machine oil vapor and steam are filtered out, and the condensed water and waste engine oil are filtered. The liquid flows along the oil-water separator into the bottom of the oil-water sedimentation chamber and is discharged through the sewage outlet. The clean combustible mixture passes through the air filter and enters the intake manifold and is delivered to the intake combustion system. After the exhaust gas of the present invention is treated The combustible mixture entering the intake combustion system is clean and dry, avoiding the waste engine oil vapor and water vapor entering the intake combustion system and attaching to the throttle valve and the intake manifold wall to form a mucous membrane, thereby avoiding the dusty air viscosity. The formation of thicker and thicker sludge on the mucous membrane and the accumulation of carbon after entering the combustion chamber and the exhaust gas purification system increase the sensitivity of the intake pressure sensor and the oxygen sensor, and make the combustion more complete, thus greatly reducing the cause. The probability of insufficient engine power, increased fuel consumption, excessive exhaust emissions, and increased maintenance costs due to carbon deposits.

Instruction sheet

The present invention will be further described below in conjunction with the accompanying drawings:

1 is a schematic structural view of a crankcase exhaust gas treatment system in the prior art;

2 is a schematic structural view of a crankcase exhaust gas treatment system provided by the present invention.

detailed description

Referring to Fig. 1, Fig. 1 is a schematic structural view of a crankcase exhaust gas treatment system in the prior art; wherein, 1 is a valve chamber cover, 2 is an air cleaner, 4 is an intake manifold, 5 is a throttle, and 11 is Crankcase valve chamber cover vent (exhaust gas outlet), 13 is the intake valve, 14 is the ventilation pipe, 15 is the PCV check valve, 21 is the air filter, 22 is the air filter air outlet, 23 is the air filter Air inlet, 41 is the intake pressure sensor.

In the crankcase exhaust gas treatment system of the prior art, the crankcase exhaust gas directly enters the intake manifold through the crankcase ventilation pipe 14, and part of the exhaust gas of the crankcase 1 is also forcibly sucked into the intake manifold 4 through the PCV valve 15, and finally enters In the intake combustion system, since the exhaust gas contains waste engine oil and water, entering the intake manifold 4 will adhere to the throttle valve 5 and the intake manifold wall to form a layer of mucosa, which is unfiltered when it comes from the air filter. When the dust is clean, it adheres. As the use time is extended, a layer of sludge is formed, which is thicker and thicker, which affects the sensitivity of the intake pressure sensor 41; when the exhaust gas enters through the high temperature intake valve In the combustion chamber, the oil vapor in the high temperature will crack to form hard carbon deposits, and the water vapor will hinder the normal combustion of the fuel; due to the slow burning speed of the oil, the unburned waste oil gas will enter the exhaust gas purification system. Due to the high temperature of the exhaust gas purification system (400-600 ° C), the oil cracking reaction can still generate hard carbon deposits, thereby blocking the ceramic micropores of the oxygen sensor and the three-way catalyst, resulting in the engine. Lack of power, increased fuel consumption, exhaust emissions exceeded, maintenance costs and other.

Embodiment 1: In order to solve the above problems in the prior art crankcase exhaust gas treatment system, as shown in FIG. 2, the present invention provides a crankcase exhaust gas treatment system including a crankcase gas. a door cover 1, a vent 11 provided on the crankcase valve cover, an air cleaner 2, an air filter 21 disposed in the air cleaner 2, and a bottom portion of the air cleaner 2 The oil-water separator 3; the oil-water separator 3 includes an exhaust gas inlet 32, a combustible mixed gas outlet 34, a condensing device 33 disposed inside the oil-water separator 3, and an oil-water sedimentation chamber 31 disposed at the bottom of the oil-water separator 3, and the exhaust gas inlet 32 is located in the oil-water Above the sedimentation chamber 31, a drain outlet 311 is arranged at the bottom of the oil-water sedimentation chamber 31; a ventilation bellows 12 is arranged between the exhaust gas inlet 32 and the vent 11; the crankcase exhaust gas is sequentially ventilated by the ventilating bellows 12 and the oil-water separator 3 The gas, combustible gas mixture enters the intake combustion system via the air filter element 21.

In the embodiment, the crankcase exhaust gas is sent to the oil-water separator 3 through the ventilation bellows 12, and after being condensed by the adhesion and condensation device 33 of the ventilation bellows 12, the water vapor in the exhaust gas and the waste engine oil vapor are filtered out and condensed. The water and waste oil are discharged into the bottom of the oil-water sedimentation chamber 31 along the bottom of the oil-water separator 3 through the drain port 311, thereby obtaining a clean combustible gas mixture. The clean combustible gas mixture is passed through the air filter element 21 and then sent to the intake combustion system through the air outlet 22 of the air cleaner 2. After the exhaust gas treatment of the present invention, the combustible mixed gas entering the intake combustion system is cleaned and dried, and the waste engine oil vapor and water vapor are prevented from entering the intake combustion system and adhering to the throttle valve 5 and the intake manifold wall to form a mucous membrane. It avoids the phenomenon that dusty air adheres to the mucous membrane to form thicker and thicker sludge, and also avoids the formation of hard carbon deposits when the waste oil vapor passes through the high temperature intake valve 13 and the combustion chamber and the exhaust gas purification system. Therefore, the intake combustion system and the exhaust gas purification system of the engine are kept clean for a long time, the sensitivity of the intake pressure sensor 41 and the oxygen sensor is improved, the normal combustion of the fuel in the combustion chamber is ensured, and the cause of the carbon deposition is greatly reduced. The probability of insufficient engine power, increased fuel consumption, excessive exhaust emissions, and increased maintenance costs.

Embodiment 2: In order to ensure that the combustible mixture entering the intake manifold 4 is clean, dry, or not contaminated by the dusty air entering from the air inlet 23, the technical feature is added on the basis of the above-mentioned embodiment 1: after the combustible mixture The gas at the outlet 34 is filtered through the air filter 21 and enters the intake manifold 4. The clean and dry combustion of the combustible gas mixture entering the intake combustion system is further ensured, so that the fuel in the combustion chamber is fully burned, the engine power is enhanced, and fuel is saved.

If the sludge at the throttle valve is formed, a sludge step is formed on the outer edge of the throttle valve 5 due to the mechanical switch of the throttle valve 5. When the vehicle is traveling at a low speed, the intake air is hindered by the sludge step due to the small opening degree of the throttle valve 5. , so that the intake air amount does not match the opening degree of the throttle valve 5, resulting in insufficient intake air amount. If the combustible mixture is too rich, the combustion will be insufficient, resulting in a sharp increase in harmful gas emissions, increased fuel consumption, and unstable ignition. Due to the lack of oxygen in the crankcase exhaust gas, the heat of combustion of the oil in the exhaust gas cannot be utilized, and oxygen consumption is required. In addition, the flame retardant water in the exhaust gas affects the normal combustion of the fuel, so the oil in the exhaust gas, The water discharge not only prevents the formation of carbon deposits, but also allows the combustible mixture in the exhaust gas to be fully combusted, so that the power is increased and the fuel is saved. This embodiment can solve this problem.

Embodiment 3: Different from the above embodiment, the length of the ventilation bellows in the embodiment ranges from 40 to 80 cm; and the ventilation bellows 12 is inclined upward from the air outlet 11 in the direction in which the crankcase exhaust gas flows out. During the flow of the exhaust gas in the bellows, the relatively stable molecular oil gas can be attached to the bellows to become the oil liquid, and the bellows is used as the ventilation pipe to increase the area in contact with the exhaust gas, and the exhaust gas is in the flow of the bellows due to The specific shape of the bellows forms a lot of air swirls, so that the effect of separating the oil from the exhaust gas is obvious. In order to enable the separated oil liquid to be returned to the crankcase, the embodiment defines that the ventilation bellows 12 is inclined upward from the vent 11 to extend the crankcase exhaust gas outflow direction, that is, the position of the vent 11 is slightly lower, and then In the embodiment, about three-quarters of the length of the bellows is higher than the vent 11 so that most of the oil can flow back into the crankcase, thereby reducing oil loss.

The embodiment defines that the length of the ventilation bellows is 40 cm-80 cm, because only the ventilation bellows separating the oil above 40 cm has the best effect, and the ventilation bellows below 40 cm has a small contact area with the exhaust gas, and the separation of the oil is The effect is not ideal, especially the old cars, European and American cars are more serious models of the suffocating; after the experiment, the new car uses 40cm-80cm ventilation bellows oil separation rate is about 70%, old cars or suffocating European cars The separation rate is about 50%, and the remaining part can be basically separated after being passed through the oil-water separator 3, discharged through the oil-water sedimentation chamber 31 and the sewage outlet 311 or collected in a quantitative container, and poured out on time, which is less polluting to the atmosphere and the environment.

Embodiment 4: The oil-water separator 3 is disposed at the bottom of the air cleaner. Since the temperature of the portion is low, the principle of oil-water separation utilized by the present invention is waste oil vapor, water vapor, and combustible mixture (main component HC). The temperature required to change to a liquid state is different, so the separation effect is better as the temperature difference is relatively large, so that the volume of the condensing device can be appropriately reduced according to the displacement of the vehicle, so the oil water separator is placed at the bottom of the air cleaner. It is a technical feature of the present invention that is both aesthetically pleasing and cost effective.

The above-described embodiments are intended to exemplify the invention, which can be implemented or used by those skilled in the art. It will be apparent to those skilled in the art that the present invention includes, but is not limited to, the above embodiments, any The methods, processes, and products that meet the same or similar principles as those disclosed herein are within the scope of the present invention.

Claims

A crankcase exhaust gas treatment system, comprising: a crankcase valve chamber cover, a vent provided on the crankcase valve chamber cover, an air cleaner, and a fan filter disposed in the air cleaner An air filter and a water-oil separator disposed at a bottom of the air cleaner; the oil-water separator includes an exhaust gas inlet, a combustible mixed gas outlet, a condensing device disposed inside the oil-water separator, and a bottom portion of the oil-water separator An oil-water sedimentation chamber, the exhaust gas inlet is located above the oil-water sedimentation chamber, a drain outlet is arranged at the bottom of the oil-water sedimentation chamber; a ventilation bellows is arranged between the exhaust gas inlet and the vent; The ventilating bellows and the oil-water separator obtain a combustible mixed gas, and the combustible mixed gas enters the intake combustion system through the air filter.
A crankcase exhaust gas treatment system according to claim 1 wherein said venting bellows is corrugated and has a length in the range of 40-80 cm.
A crankcase exhaust gas treatment system according to claim 1, wherein said venting bellows is inclined upwardly from said venting port in a direction in which said crankcase exhaust gas flows out.
A crankcase exhaust gas treatment system according to claim 1 wherein said oil water separator is disposed at the bottom of the air cleaner.