A method and device for separating oil and gas for a diesel engine

Abstract

The present invention discloses a method and device for separating oil and gas for a diesel engine, comprising a cylinder head cover, an oil and gas separator, a base, an upper shell and a lower shell, wherein the upper shell and the lower shell are fixed to the engine body by bolts, the base is fixed to the upper shell, and a plurality of oil and gas separators are fixed to the base, the cylinder head cover is arranged on both sides of the lower shell, the cylinder head covers on each side are connected by a vent pipe, the air outlet of the cylinder head cover is connected to the oil and gas separator through an air intake pipe, and the two ends of the base are connected to the front intake pipe of the supercharger through the air outlet pipe. The method and device for separating oil and gas for a diesel engine form an intake channel by arranging the cylinder head covers in series, effectively solving the problem of an excessively long intake pipe and greatly improving the convenience of use.

Description

Technical Field

[0001] The present invention relates to the technical field of diesel engines, and in particular to a method and device for separating oil and gas for a diesel engine. Background Art

[0002] When a diesel engine is operating, the high-pressure combustible mixture and burned gases in the combustion chamber leak into the crankcase through the gap between the piston assembly and the cylinder, causing blowby. Fuel vapor, water vapor, and exhaust gas components in the blowby gas can reduce the performance of the engine oil and accelerate its oxidation and deterioration. Water vapor condenses in the oil, forming sludge that blocks the oil lines. Acidic gases in the exhaust gas mix into the lubrication system, causing corrosion and accelerated wear of engine parts. Blowby gas can also cause excessive crankcase pressure, damaging the crankcase seal and causing oil leakage. To meet increasingly stringent emission regulations and improve fuel economy, diesel engines must be equipped with oil-gas separation devices.

[0003] In the prior art, the air inlet of the oil-gas separation device is connected to the crankcase through a pipeline, the air outlet is connected to the supercharger intake pipe through a pipeline, and the oil return port is connected to the oil pan through a pipeline. This method has too long pipelines, requires many parts, and the assembly process is cumbersome, which seriously affects work efficiency. In addition, the pipelines are too long, the diesel engine vibrates during operation, and there is a risk of oil and gas leakage. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a method and device for oil-gas separation for a diesel engine, which is not only easy to install but also can effectively solve the risks of oil and gas leakage, and can effectively solve the problems in the background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an oil-gas separation device for a diesel engine, comprising a cylinder head cover, an oil-gas separator, a base, an upper housing, and a lower housing, wherein the upper housing and the lower housing are fixed to the engine body by bolts, the base is fixed to the upper housing, and a plurality of oil-gas separators are fixed to the base, the cylinder head cover is arranged on both sides of the lower housing, the cylinder head covers on each side are connected by a vent pipe, the air outlet of the cylinder head cover is connected to the oil-gas separator via an air intake pipe, and both ends of the base are connected to the front intake pipe of the supercharger via the air outlet pipe;

[0006] An air inlet cavity, an air outlet cavity and an oil return cavity are provided in the base;

[0007] An air inlet cavity, an air outlet cavity and an oil return cavity are provided in the upper shell;

[0008] A coarse filter and an oil return cavity are provided in the lower housing;

[0009] The air inlet cavity of the upper shell is communicated with the interior of the lower shell, the air outlet cavity of the upper shell is communicated with the interior of the base, and the air outlet cavity of the base is connected to the oil-gas separator.

[0010] As a preferred technical solution of the present invention, the cylinder head cover is a cylinder head cover with a flange.

[0011] As a preferred technical solution of the present invention, a clamping plate is mounted on the outer side surface of the flange on the cylinder head cover.

[0012] As a preferred technical solution of the present invention, the cylinder head cover and the ventilation pipe are sealed and connected via an O-ring.

[0013] As a preferred technical solution of the present invention, the ventilation pipe is a retractable structure.

[0014] As a preferred technical solution of the present invention, a connecting flange is provided at one end of the air intake pipeline, and the air intake pipeline is connected to the inlet of the oil-gas separator through the connecting flange.

[0015] As a preferred technical solution of the present invention, the air intake pipeline and the inlet of the oil-gas separator are sealed by an O-ring.

[0016] A method for separating oil and gas for a diesel engine: After the oil and gas pass through the primary filtration of a coarse filter, they enter the oil and gas separator through the air outlet cavity of the upper housing and the base for secondary filtration. After the two-stage filtration, the gas passes through the air outlet pipe on the base to the front intake pipe of the supercharger, and the oil flows back to the oil pan through the return oil cavity of the base, the upper housing and the lower housing, thus achieving oil and gas separation.

[0017] Compared with the prior art, the present invention has the following advantages: (1) simple layout, adopting a series cylinder head cover method, which can be disassembled and installed separately, with adjustable length, and is not affected by installation errors; (2) compact structure, adopting the cavity of the oil-gas separator base, upper shell, and lower shell, realizing the integration of air intake, air outlet, and oil return, and is not affected by the installation space; (3) strong versatility, for the same series of diesel engines, the number of ventilation pipes can be increased or decreased according to the amount of blowby gas, thereby improving economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the cylinder head cover connection;

[0020] Figure 3 Schematic diagram of blowby flow direction.

[0021] In the figure: 1 cylinder head cover, 2 breather pipe, 3 intake pipe, 4 oil-gas separator, 5 base, 6 upper shell, 7 lower shell, 8 exhaust pipe, 9 clamping plate. DETAILED DESCRIPTION

[0022] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments (for the convenience of description and understanding, the following is Figure 1 Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work shall fall within the scope of protection of the present invention.

[0023] See also Figure 1-3 The present invention provides a technical solution: an oil-gas separation device for a diesel engine, comprising a cylinder head cover 1, an oil-gas separator 4, a base 5, an upper shell 6 and a lower shell 7. The upper shell 6 and the lower shell 7 are fixed to the engine body by bolts, the base 5 is fixed to the upper shell 6, and multiple oil-gas separators 4 are fixed to the base 5. The cylinder head cover 1 is arranged on both sides of the lower shell 7. The cylinder head covers 1 on each side are connected by a ventilation pipe 2. The cylinder head cover 1 is a cylinder head cover with a flange, and an intake channel is formed in series through the ventilation pipe 2. The air outlet of the cylinder head cover 1 is connected to the oil-gas separator 4 through the intake pipe 3, and both ends of the base 5 are connected to the front intake pipe of the supercharger through the outlet pipe 8.

[0024] An air inlet chamber, an air outlet chamber and an oil return chamber are provided in the base 5, an air inlet chamber, an air outlet chamber and an oil return chamber are provided in the upper shell 6, a coarse filter and an oil return chamber are provided in the lower shell 7, the air inlet chamber of the upper shell 6 is connected to the interior of the lower shell 7, the air outlet chamber of the upper shell 6 is connected to the interior of the base 5, and the air outlet chamber of the base 5 is connected to the oil-gas separator 4.

[0025] Furthermore, in order to prevent the breather pipe 2 from axially moving during the operation of the diesel engine, a clamping plate 9 is mounted on the outer side surface of the flange on the cylinder head cover 1 .

[0026] Furthermore, in order to prevent oil and gas leakage, the cylinder head cover 1 and the breather pipe 2, as well as the intake pipe 3 and the inlet of the oil-gas separator 4 are sealed and connected via O-rings.

[0027] Furthermore, in order to facilitate installation and not be affected by installation errors, the ventilation pipe 2 is a pipe with a groove, and the ventilation pipe 2 can be adjusted to a required length through the grooves thereon.

[0028] Furthermore, in order to achieve quick installation, a connecting flange is provided at one end of the air intake pipe 3 , and the air intake pipe 3 is connected to the inlet of the oil-gas separator 4 through the connecting flange.

[0029] A method for separating oil and gas for a diesel engine: After the oil and gas pass through the primary filtration of the coarse filter, they enter the oil-gas separator 4 through the air outlet cavity of the upper shell 6 and the base 5 for secondary filtration. After the two-stage filtration, the gas passes through the air outlet pipe 8 on the base 5 to the front intake pipe of the supercharger, and the oil flows back to the oil pan through the return oil cavity of the base 5, the upper shell 6 and the lower shell 7, thus achieving oil and gas separation.

[0030] The present invention forms an intake passage by arranging a series cylinder head cover 1, thereby effectively solving the problem of an excessively long intake pipe 3; and the present invention can be disassembled and installed separately, and the installation is simple, and the number of ventilation pipes can be increased or decreased according to the amount of blowby gas, which greatly improves the convenience of use.

[0031] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An oil-gas separation device for a diesel engine, characterized in that: The invention comprises a cylinder head cover (1), an oil-gas separator (4), a base (5), an upper shell (6) and a lower shell (7), wherein the upper shell (6) and the lower shell (7) are fixed to the engine body by bolts, the base (5) is fixed to the upper shell (6), and a plurality of oil-gas separators (4) are fixed to the base (5), the cylinder head cover (1) is arranged on both sides of the lower shell (7), the cylinder head covers (1) on each side are connected by a vent pipe (2), the cylinder head cover (1) and the vent pipe (2) are sealed by an O-ring, the air outlet of the cylinder head cover (1) is connected to the oil-gas separator (4) through an air intake pipe (3), and both ends of the base (5) are connected to the front air intake pipe of the supercharger through an air outlet pipe (8); An air inlet cavity, an air outlet cavity and an oil return cavity are provided in the base (5); An air inlet cavity, an air outlet cavity and an oil return cavity are provided in the upper shell (6); A coarse filter and an oil return chamber are provided in the lower housing (7); The air inlet cavity of the upper shell (6) is communicated with the interior of the lower shell (7), the air outlet cavity of the upper shell (6) is communicated with the interior of the base (5), and the air outlet cavity of the base (5) is connected to the oil-gas separator (4); The oil and gas separation method is as follows: the oil and gas are filtered through the primary filter by the coarse filter and then enter the oil and gas separator (4) through the air outlet cavity of the upper shell (6) and the base (5) for secondary filtration. After the two-stage filtration, the gas passes through the air outlet pipe (8) on the base (5) to the front intake pipe of the supercharger, and the oil flows back to the oil pan through the oil return cavity of the base (5), the upper shell (6) and the lower shell (7), thereby achieving oil and gas separation.

2. The oil-gas separation device for a diesel engine according to claim 1, characterized in that: The cylinder head cover (1) is a cylinder head cover with a flange.

3. The oil-gas separation device for a diesel engine according to claim 2, characterized in that: A clamping plate (9) is mounted on the outer side surface of the flange on the cylinder head cover (1).

4. The oil-gas separation device for a diesel engine according to claim 1, characterized in that: The vent pipe (2) is a retractable structure.

5. The oil-gas separation device for a diesel engine according to claim 1, characterized in that: One end of the air intake pipeline (3) is provided with a connecting flange, and the air intake pipeline (3) is connected to the inlet of the oil-gas separator (4) via the connecting flange.

6. The oil-gas separation device for a diesel engine according to claim 1, characterized in that: The air intake pipeline (3) and the inlet of the oil-gas separator (4) are sealed and connected via an O-ring.

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