CN111022149A

CN111022149A - A crankcase oil and gas processing mechanism and an engine equipped with the same

Info

Publication number: CN111022149A
Application number: CN201911401722.7A
Authority: CN
Inventors: 徐霞琴; 黄国彧; 齐行飞
Original assignee: WEICHAI POWER YANGZHOU DIESEL ENGINE CO Ltd; Weichai Power Co Ltd
Current assignee: WEICHAI POWER YANGZHOU DIESEL ENGINE CO Ltd; Weichai Power Co Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-04-17
Anticipated expiration: 2039-12-31
Also published as: CN111022149B

Abstract

The invention discloses a crankcase oil-gas treatment mechanism, which comprises a crankcase and a supercharger arranged on an engine, wherein a cylinder cover is arranged on the crankcase, a gas discharge pipe is connected on the cylinder cover, a labyrinth oil-gas separation device is arranged on the cylinder cover, an exhaust outlet of the crankcase is communicated with an inlet of the labyrinth oil-gas separation device, the gas discharge pipe is connected at the gas outlet end of the labyrinth oil-gas separation device, a back pressure regulator is further arranged on the gas discharge pipe and comprises a regulator shell, the regulator shell comprises an inlet section and an outlet section which are arranged oppositely, a pressure regulating plate is arranged between the inlet section and the outlet section, the inlet section, the outlet section and the pressure regulating plate are connected into a whole through bolts, a plurality of air passing holes communicated with an inner cavity of the inlet section and an inner cavity of the outlet section are formed in the pressure regulating plate, and the rear part of the outlet section is connected with a supercharger through a gas transmission pipeline. The invention improves the efficiency of the supercharger, thereby improving the dynamic property and the economical efficiency of the engine.

Description

Crankcase oil gas treatment mechanism and engine provided with same

Technical Field

The invention relates to a crankcase oil-gas treatment mechanism and an engine provided with the same.

Background

When the engine is running, part of the high-pressure combustible mixture and burnt gas in the combustion chamber can leak into the crankcase through the clearance between the piston group and the cylinder. The waste gas in the crankcase is unburnt fuel gas, water vapor, waste gas and the like, which can dilute engine oil, reduce the service performance of the engine oil, accelerate the oxidation and the deterioration of the engine oil and cause certain influence on the performance and the structure of an engine. In addition, national regulations require that national VI discharge must enforce respirator closed circulation, that is, the waste gas of the crankcase cannot be directly discharged into the atmosphere, and the waste gas must be returned to a supercharger air inlet system of the diesel engine through a pipeline to participate in combustion after being discharged, because the supercharger can generate certain negative pressure when breathing in, the negative pressure can cause the crankcase to be changed from positive pressure in the open state into negative pressure, the air leakage of a piston is increased, thereby the waste gas of the crankcase is increased, the flow of the waste gas entering an oil-gas separator is increased, under the condition that the separation efficiency is not changed, the content of the discharged gas is increased, the waste gas containing oil enters the supercharger, and the inner wall and the blades of the supercharger are attached with a great amount of mixed oil sludge of the waste gas and the engine oil, so that the efficiency of.

Disclosure of Invention

The invention aims to solve the first technical problem of providing a crankcase oil gas treatment mechanism which can increase the back pressure when the crankcase is exhausted to balance the negative pressure of air exhaust of a supercharger, thereby reducing the increase of piston air leakage of the crankcase caused by the negative pressure of the supercharger, reducing the probability of oil gas entering the supercharger and ensuring the efficiency of the supercharger.

For solving above-mentioned technical problem, the crankcase oil gas processing mechanism that provides, including setting up crankcase and the booster on the engine, be equipped with the cylinder head cover on the crankcase, the cylinder head covers and is connected with gas discharge pipe, its characterized in that: labyrinth oil-gas separator is equipped with on the cylinder head cover, the exhaust outlet intercommunication labyrinth oil-gas separator's of crankcase inlet port, the gas outlet end at labyrinth oil-gas separator is connected to the gas discharge pipe, still be equipped with back pressure regulator on the gas discharge pipe, back pressure regulator includes the regulator casing, and the regulator casing is equipped with the pressure regulating board including relative entering section and the discharge section that sets up between entering section and the discharge section, and entering section, discharge section and pressure regulating board pass through bolted connection as an organic whole, be equipped with a plurality of gas holes of crossing that the intercommunication got into section inner chamber and discharge section inner chamber on the pressure regulating board, the rear portion of discharge section is passed through the gas pipeline and is connected with the booster.

The inner cavity of the inlet section is gradually increased from front to back, and the inner cavity of the outlet section is gradually decreased from front to back.

The air holes are uniformly distributed along the center of the pressure regulating plate.

Labyrinth oil gas separator is including setting up the exhaust chamber on the cylinder head cover, the rear portion of exhaust chamber is equipped with the oil gas inlet port that sets up down, be equipped with the oil baffle that corresponds the setting of oil gas inlet port and slope setting on the locular wall rear portion of exhaust chamber, still be connected with the barrier plate that is located oil baffle rear and interval setting on the locular wall of exhaust chamber, wherein part barrier plate connects on the top locular wall of exhaust chamber, another part barrier plate connects on the bottom locular wall of exhaust chamber, the barrier plate of connection on the top locular wall extends towards the bottom locular wall and should set up the gas passageway between barrier plate and the bottom locular wall, the barrier plate of connection at the bottom locular wall extends towards the top locular wall and should set up the gas passageway between barrier plate and the top loc.

And sealing gaskets are respectively arranged between the inlet section and the pressure regulating plate and between the pressure regulating plate and the discharge section.

Adopt the crankcase oil gas processing mechanism of above-mentioned structure, oil gas in the crankcase passes through labyrinth oil gas separation device earlier, through its first oil-gas separation, make fluid return to in the crankcase, gaseous by the gas discharge pipe discharge, through back pressure regulator, the negative pressure that the booster formation of bleeding is balanced to the backpressure of giving vent to anger that increases crankcase waste gas, make the closed circulation of crankcase waste gas and open circulation difference change little, overcome a large amount of oil gas entering booster and reduced the problem of the efficiency of booster, moreover, the steam generator is simple in structure, therefore, the cost is low, and the effect is obvious. According to the invention, the influence of the air exhaust negative pressure of the supercharger on the pressure of the crankcase is balanced by increasing the air outlet back pressure of the crankcase, so that the air leakage of the piston is reduced, the oil content of the outlet air is reduced, the oil and gas adhesion on the supercharger is reduced, the efficiency of the supercharger is improved, and the dynamic property and the economical efficiency of the engine are improved.

The second technical problem to be solved by the invention is to provide an engine, and the crankcase oil gas treatment mechanism with the structure is arranged on the engine.

The engine adopting the crankcase oil gas treatment mechanism with the structure can ensure the efficiency of the supercharger and the fresh air quantity entering the engine, thereby improving the dynamic property and the economical efficiency of the engine.

Drawings

The invention is further described with reference to the accompanying drawings in which:

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic view of the labyrinth oil-gas separation device connected to the crankcase in the embodiment of FIG. 1;

fig. 3 is a schematic structural view taken along line a-a in fig. 1.

Detailed Description

As shown in fig. 1, the present invention provides an embodiment of a crankcase oil-gas processing mechanism, since the basic structure of an engine is the prior art, the basic structure thereof will not be described in detail herein, and according to the working principle of the engine and the prior art, it is clear to those skilled in the art that the positions of the components mounted on the engine in the embodiment are known, and the connection relationship of the components is only illustrated in the figure, and the specific structure and position of the components connected to the engine will not be described in detail herein. The embodiment of figure 1 discloses a crankcase oil-gas treatment mechanism, which comprises a crankcase 2, an air filter 6 and a supercharger 5 which are arranged on an engine, wherein a cylinder cover 3 is arranged on the crankcase 2, a gas discharge pipe 4 is connected on the cylinder cover 3, a labyrinth oil-gas separation device is arranged on the cylinder cover 3, an exhaust outlet of the crankcase 2 is communicated with an inlet of the labyrinth oil-gas separation device, the gas discharge pipe 4 is connected with an outlet end of the labyrinth oil-gas separation device, a back pressure regulator is also arranged on the gas discharge pipe, the back pressure regulator comprises a regulator shell 1, the regulator shell comprises an inlet section and an outlet section which are oppositely arranged, a pressure regulating plate 11 is arranged between the inlet section and the outlet section, the inlet section, the outlet section and the pressure regulating plate 11 are connected into a whole through bolts, a plurality of air holes 13 which are communicated with an inner cavity of the inlet section and an inner cavity of the outlet section are, the rear part of the discharge section is connected with the supercharger 5 through an air pipeline 7, and an output pipeline of the air filter 6 is connected with the air pipeline in parallel and is connected with the inlet end of the supercharger 5 together.

Referring to fig. 1 and 3, the inner cavity of the inlet section gradually increases from front to back, the inner cavity of the outlet section gradually decreases from front to back, the plurality of air holes 13 are uniformly distributed around the center of the pressure regulating plate, and sealing gaskets are respectively arranged between the inlet section and the pressure regulating plate and between the pressure regulating plate and the outlet section. After adopting above-mentioned structure, gas discharge pipe 4 gets into back pressure regulator in the back, because advance get into the progressively bigger entering section of inner chamber, therefore can suitable buffer pressure, and through the effect of blockking of pressure regulating board, only partial gas can pass through, therefore adjust the backpressure of giving vent to anger, can hinder the gas pressure of air current operation promptly, thereby reduce the gas volume in the 5 suction gas pipelines of booster, the at utmost reduces the probability that oil gas got into the booster, guarantee the volume of the fresh air who gets into in the booster, thereby guarantee the efficiency of booster.

Referring to fig. 1, the labyrinth oil-gas separation device includes an exhaust chamber disposed on a cylinder head cover, an oil-gas inlet port disposed downward is disposed at the rear of the exhaust chamber, an oil baffle plate disposed corresponding to the oil-gas inlet port and disposed obliquely is disposed at the rear of a chamber wall of the exhaust chamber, a blocking plate disposed at a distance behind the oil baffle plate is further connected to the chamber wall of the exhaust chamber, a part of the blocking plate is connected to a top chamber wall of the exhaust chamber, another part of the blocking plate is connected to a bottom chamber wall of the exhaust chamber, the blocking plate connected to the top chamber wall extends toward the bottom chamber wall, an air passage is disposed between the blocking plate and the bottom chamber wall, the blocking plate connected to the bottom chamber wall extends toward the top chamber wall, and an air passage is disposed between the blocking plate and the top chamber wall, by the above-mentioned structure, a total air passage bent upward and downward can be, the oil-gas separation effect is ensured.

The invention also provides an engine, the engine is provided with the crankcase oil gas treatment mechanism with the structure, and the specific connection position of each component in the crankcase oil gas treatment mechanism on the engine and the connection structure are known technologies available to those skilled in the art, and detailed description is omitted here.

The invention is not limited to the embodiments described above, but equivalent variations of the specific structures and simple substitutions of method steps based on the present invention are within the scope of the invention as will be apparent to those skilled in the art.

Claims

1. A crankcase oil and gas processing mechanism, comprising a crankcase and a supercharger arranged on the engine, the crankcase is provided with a cylinder head cover, and the cylinder head cover is connected with a gas discharge pipe, it is characterized in that: the cylinder head The cover is equipped with a labyrinth oil and gas separation device, the exhaust outlet of the crankcase is connected to the inlet of the labyrinth oil and gas separation device, and the gas discharge pipe is connected to the gas outlet end of the labyrinth oil and gas separation device. A back pressure regulator is also installed. The back pressure regulator includes a regulator housing. The regulator housing includes an inlet section and a discharge section arranged oppositely. A pressure regulating plate is installed between the inlet section and the discharge section. The inlet section and the discharge section It is integrally connected with the pressure regulating plate by bolts. The pressure regulating plate is provided with a plurality of air holes connecting the inner cavity of the inlet section and the inner cavity of the discharge section, and the rear part of the discharge section is connected to the supercharger through the gas pipeline. .

2 . The crankcase oil and gas processing mechanism according to claim 1 , wherein the inner cavity of the inlet section gradually increases from front to back, and the inner cavity of the discharge section gradually decreases from front to rear. 3 .

3 . The crankcase oil and gas processing mechanism according to claim 1 , wherein the plurality of air passage holes are evenly distributed along the center of the pressure regulating plate. 4 .

4. The crankcase oil and gas processing mechanism according to any one of claims 1 to 3, wherein the labyrinth type oil and gas separation device comprises an exhaust chamber arranged on the cylinder head cover, and the rear part of the exhaust chamber There is an oil and gas inlet set downward, and the rear part of the chamber wall of the exhaust chamber is equipped with an oil baffle set corresponding to the oil and gas inlet and inclined, and the chamber wall of the exhaust chamber is also connected with a space behind the oil baffle. A blocking plate is provided, wherein part of the blocking plate is connected to the top chamber wall of the exhaust chamber, another part of the blocking plate is connected to the bottom chamber wall of the exhaust chamber, and the blocking plate connected to the top chamber wall extends toward the bottom chamber wall and An air passage is provided between the blocking plate and the bottom chamber wall, the blocking plate connected to the bottom chamber wall extends toward the top chamber wall, and an air passage is provided between the blocking plate and the top chamber wall.

5. The crankcase oil and gas processing mechanism according to any one of claims 1-3, characterized in that a gasket is installed between the inlet section and the pressure regulating plate, and between the pressure regulating plate and the discharge section, respectively.

6. An engine, characterized in that: the engine is provided with a crankcase oil and gas treatment mechanism as claimed in claims 1-5.