CN204804902U - Anti -freeze crankcase ventilation system pipeline structure - Google Patents

Abstract

The utility model provides an anti-icing crankcase ventilation system pipeline structure, which includes an oil-gas separation device, an air inlet and a meandering pipeline. The meandering pipeline includes one end connected to the oil-gas separation device through a PCV valve. The crankcase ventilation hose, the other end of the crankcase ventilation hose communicates with the EGR exhaust gas passage, and the EGR exhaust gas passage communicates with the intake passage. After adopting the utility model, the gas in the crankcase passes through the oil-gas separation, then flows into the EGR waste gas passage, and then enters the intake passage. Since the EGR exhaust gas passage belongs to the engine cylinder head body and the temperature of the EGR exhaust gas itself is relatively high, when the gas from the crankcase enters the EGR exhaust gas passage, the water vapor will not condense and freeze due to the sudden drop in gas temperature, which can prevent the winding pipe from being blocked .

Description

An Anti-icing Crankcase Ventilation System Piping Structure

technical field

The utility model belongs to the field of automobiles and relates to a crankcase ventilation system, in particular to an anti-icing pipeline structure of the crankcase ventilation system.

Background technique

During the operation of the engine, combustion exhaust gas will inevitably enter the crankcase from the piston and piston ring, piston ring and cylinder liner, etc. Over time, it will cause the pressure in the crankcase to rise and cause problems such as engine seal failure. These gases are expelled. However, if the oil-air mixture is directly discharged into the atmosphere, it will cause high oil consumption and environmental pollution. A positive crankcase ventilation system (i.e. PCV system) is introduced during the engine design process. The purpose of this ventilation system is to extract the exhaust gas that has escaped into the crankcase, so as to avoid deterioration of the engine oil or oil leakage of the oil seal due to the mixed gas. Its function is: to balance the pressure of the crankcase; to separate the oil and gas from the mixture in the crankcase, and the separated oil flows back to the oil pan, so as to solve the problems of emission and leakage caused by exhaust gas in the crankcase and corrosion of the engine.

The working principle of the crankcase ventilation system is to use the vacuum of the intake system to suck the exhaust gas in the crankcase into the engine intake system, and enter the combustion chamber to reorganize combustion, so as to ensure that the exhaust gas in the crankcase is not directly discharged into the atmosphere, reducing pollution emission of matter. The exhaust gas from the crankcase is first separated by the oil-gas separator of the valve chamber cover, and the oil droplets are separated and then flow back into the cylinder head. The separated gas enters the intake manifold through the PCV valve through two outlets. The other path enters the intake hose through the one-way valve, and finally the gas will enter the combustion chamber through the intake system for re-combustion.

In the previous design, the gas separated from the crankcase was directly connected to the intake manifold or the air filter hose after passing through the tortuous pipeline. Since the crankcase gas contains a lot of water, vehicles working in cold regions often have crankcase problems. The ventilation system is blocked due to ice formation. When the lower temperature gas in the air mixes with the gas separated from the crankcase, the temperature of the gas separated from the crankcase drops sharply, causing the tortuous line to freeze at the intersection with the manifold or the intake hose. It will clog over time. If this situation is not dealt with in time, the gas pressure in the crankcase will increase instantaneously, the oil seal will rush out, the oil will leak from the seal, and the engine will be damaged. Seriously, it may also lead to traffic accidents.

In order to avoid the failure phenomenon caused by freezing and blocking of the above-mentioned engine crankcase ventilation system. In general, the following methods are adopted to improve the product design: avoid U-shaped curved pipelines; avoid the arrangement of curved pipelines facing the wind; The pipeline increases the heating system, etc. In the above method, adding a heating system can effectively solve the problem of icing on the bend. Now many vehicles use this method, but the cost is relatively high. Other methods only improve the icing of the crankcase, but cannot fundamentally solve the problem of icing in the crankcase ventilation system.

Utility model content

The utility model provides an anti-icing crankcase ventilation system pipeline structure, which has solved the problem that the crankcase ventilation system is easy to freeze and block in a low-temperature environment. Avoid the hazards caused by the freezing of the crankcase ventilation system and ensure the use of vehicles in severe cold areas.

In order to achieve the above object, the technical scheme that the utility model takes is:

The pipeline structure of the anti-freezing crankcase ventilation system includes an oil-gas separation device, an air inlet and a meandering pipeline, and the meandering pipeline includes a crankcase connected to the oil-gas separation device at one end through a PCV A ventilation hose, the other end of the crankcase ventilation hose communicates with the EGR exhaust gas passage, and the EGR exhaust gas passage communicates with the intake passage.

It also includes a cavity communicated with the EGR exhaust gas passage arranged in the EGR cover plate, there are at least two intake channels, and the cavities communicate with each intake channel respectively.

The oil-gas separation device includes a labyrinth oil-gas separation structure arranged in the valve chamber cover.

With the above-mentioned technical scheme, the gas in the crankcase passes through the oil-gas separation, then flows into the EGR waste gas passage, and then enters the intake passage. Since the EGR exhaust gas passage belongs to the engine cylinder head body and the temperature of the EGR exhaust gas itself is relatively high, when the gas from the crankcase enters the EGR exhaust gas passage, the water vapor will not condense and freeze due to the sudden drop in gas temperature, which can prevent the winding pipe from being blocked .

There are at least two intake ports, and the EGR exhaust gas channels are respectively connected to each intake port through the cavity, which can help the gas to enter each intake port on average. This reduces engine fuel consumption and improves exhaust gas recirculation efficiency. Compared with directly connecting the EGR exhaust gas passage with the intake passage respectively, using the cavity in the EGR cover plate to communicate can also reduce the arrangement space of the EGR exhaust gas passage.

The labyrinth oil-vapor separation structure has a good separation effect, and is integrated with the valve chamber cover, which takes up little space and is reliable and durable.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a schematic diagram of the structure inside the valve chamber cover of the utility model.

The markings in the figure are:

1. Valve chamber cover; 2. PCV valve; 3. Crankcase ventilation hose; 4. Cylinder head; 5. EGR exhaust gas channel; 6. EGR cover plate; structure.

Detailed ways

The specific implementation of the utility model will be described in further detail below by describing the embodiments with reference to the accompanying drawings, so as to help those skilled in the art have a more complete, accurate and in-depth understanding of the inventive concept and technical solutions of the utility model.

As shown in Fig. 1 and Fig. 2, the utility model provides an anti-icing crankcase ventilation system pipeline structure, including an oil-gas separation device, an air inlet 7 and a curved pipeline. In order to prevent the pipeline from freezing, the EGR exhaust gas channel 5 in the exhaust gas recirculation system (ie, EGR system) is also utilized therein.

The oil-gas separation device includes a labyrinth oil-gas separation structure 8 arranged in the valve chamber cover 1 . The tortuous pipeline includes a crankcase ventilation hose 3 whose one end communicates with the labyrinth oil-vapor separation structure 8 through the PCV valve 2 , and the other end of the crankcase ventilation hose 3 communicates with the EGR exhaust gas passage 5 . There are four intake passages 7 , and the EGR cover plate 6 is provided with cavities respectively communicating with the four intake passages 7 . The EGR exhaust gas channel 5 communicates with each intake channel 7 through the cavity, so that the gas enters each intake channel 7 evenly.

The oil-air mixture coming out of the crankcase passes through the valve chamber cover 1 and is separated from the engine oil by the labyrinth oil-vapor separation structure 8 therein. The separated engine oil returns to the oil sump of the cylinder head 4 due to gravity, and finally returns to the oil pan through the oil return channel on the cylinder head 4. Because there is a certain pressure difference between the two ends of PCV valve 2, and the negative pressure at the rear end of PCV valve 2 is larger than that at the front end, the gas separated by the labyrinth oil-vapor separation structure 8 comes out through PCV valve 2, and then passes through a crankcase ventilation hose 3. Enter the EGR exhaust passage 5 on the cylinder head 4. Then these gases enter the cavity inside the EGR cover plate 6 together with the combustion exhaust gas in the EGR exhaust gas channel 5 , and then enter the intake port 7 of each cylinder respectively through the cavity for recombustion.

Since the EGR waste passage belongs to the engine cylinder head body and the temperature of the EGR exhaust gas is relatively high, when the gas from the crankcase enters the EGR exhaust passage 5, water vapor will not condense and freeze due to a sudden drop in gas temperature. Causes blockage of the curved pipe.

The utility model has been exemplarily described above in conjunction with the accompanying drawings. Obviously, the specific implementation of the utility model is not limited by the above-mentioned method, as long as various insubstantial improvements are adopted in the concept of the utility model and technical solutions, or there is no Directly applying the ideas and technical solutions of the utility model to other occasions through improvement is within the protection scope of the utility model.

Claims (3)

1. An anti-freezing crankcase ventilation system piping structure, comprising an oil-gas separation device, an air inlet (7) and a meandering pipeline, is characterized in that: said meandering pipeline includes one end passing through a PCV valve (2 ) the crankcase ventilation hose (3) connected to the oil-gas separation device, the other end of the crankcase ventilation hose (3) communicates with the EGR exhaust gas passage (5), and the EGR exhaust gas passage (5) communicates with the intake air Road (7) is connected. 2. A kind of anti-freezing crankcase ventilation system pipeline structure according to claim 1, characterized in that: it also includes an air hole in the EGR cover plate (6) communicated with the EGR exhaust gas passage (5). There are at least two air inlet passages (7), and the cavities communicate with each air inlet passage (7). 3. A pipeline structure for anti-icing crankcase ventilation system according to claim 1, characterized in that: said oil-gas separation device comprises a labyrinth oil-gas separation structure arranged in the valve chamber cover (1) (8).