阅读说明：本技术 一种滚筒式高效柴油机油气分离器 (Drum-type efficient oil-gas separator for diesel engine ) 是由 李保儒 尹立雪 吴贞明 吴俊霖 于 2021-08-06 设计创作，主要内容包括：本发明属于柴油机油气分离装置技术领域,具体涉及一种滚筒式高效柴油机油气分离器,上过滤组件和下过滤组件的分离设计,在无需重新设计模具,增加成本和制造难度的情况下,可根据柴油机空间布局,调整进气管道和出气管道的位置,满足安装需求；第一过滤腔、第二过滤腔和单向阀组件的配合使用,可根据窜气量的大小自动调整气流走向,保证了各种窜气量情况下的压力损失和分离效果；回油孔和回油通道的独立设置,避免回油不畅,导致机油积累而被气流从出气口带出,可以将机油有效收集回流。本发明提供的一种滚筒式高效柴油机分离器解决了现有技术中油气分离器出口位置不可调、限制不同机型通用性和产品系列化生产,不能根据窜气量大小进行自动调整保证分离效果和压力损失的问题。(The invention belongs to the technical field of oil-gas separation devices of diesel engines, and particularly relates to a drum-type efficient oil-gas separator of a diesel engine, wherein an upper filter assembly and a lower filter assembly are separately designed, so that the positions of an air inlet pipeline and an air outlet pipeline can be adjusted according to the spatial layout of the diesel engine under the conditions that a mold does not need to be redesigned, and the cost and the manufacturing difficulty are increased, and the installation requirement is met; the first filter cavity, the second filter cavity and the one-way valve component are matched for use, the trend of the airflow can be automatically adjusted according to the air blowby quantity, and the pressure loss and the separation effect under various air blowby quantity conditions are ensured; the independent setting of oil gallery and oil return passageway avoids the oil return not smooth, leads to the machine oil accumulation and is taken out from the gas outlet by the air current, can effectively collect the backward flow with machine oil. The invention provides a drum-type efficient diesel engine separator, which solves the problems that in the prior art, the outlet position of an oil-gas separator is not adjustable, the universality of different machine types and the product series production are limited, and the separation effect and the pressure loss can not be ensured by automatically adjusting according to the air blowby quantity.)

1. The utility model provides a high-efficient diesel engine oil and gas separator of drum-type which characterized in that:

comprises an upper separation assembly, wherein the upper separation assembly comprises an upper shell (1) and an upper filtering part; the upper shell (1) is a cylindrical shell with a closed upper part and an open lower part, and the outer surface of the upper shell is fixedly connected with an air inlet pipeline (2); the upper filtering part is arranged in the upper shell (1);

the lower separation component comprises a lower shell (3), a buffer part (4) and a lower filtering part (5); the lower shell (3) is a cylindrical shell which is open at the top and closed at the bottom, the outer surface of the lower shell is fixedly connected with an air outlet pipeline (6), the upper end surface of the lower shell (3) is rotatably connected with the lower end surface of the upper shell (1), and the lower end surface of the lower shell (3) is provided with an oil return pipeline (7); the lower end of the buffer part (4) is fixedly connected with a lower filtering part (5), and the buffer part (4) and the lower filtering part (5) are rotatably arranged in the lower shell (3);

the lower filtering part (5) is internally of a cavity structure, and the cavity is divided into a first filtering cavity (11) and a second filtering cavity (12) through a partition plate (10); a cover plate (14) is arranged between the upper end of the second filter cavity (12) and the buffer part (4), and the lower end of the second filter cavity is communicated with the cavity of the lower shell (3) through an oil return port (13); a flow limiting hole (15) is formed in the cover plate (14), and a one-way valve assembly is arranged below the flow limiting hole (15); the one-way valve assembly comprises a guide post (27), a one-way valve body (28) and a spring (29); the guide column (27) is vertically and fixedly arranged in the cavity of the second filtering cavity (12), and the upper end of the guide column is connected with the one-way valve main body (28) through a spring (29); under the non-working state, the upper end surface of the check valve main body (28) is tightly attached to the lower end surface of the cover plate (14) to seal the flow limiting hole (15).

2. The cylinder type high efficiency diesel oil and gas separator as set forth in claim 1, wherein: the upper filter house comprises an upper filter house body (16) and a filter assembly; the upper filtering part main body (16) comprises an upper plate (17), a connecting part (18), a lower plate (19) and an oil return column (20); the upper plate (17) and the lower plate (19) are circular plates and are fixedly connected through a connecting part (18), and the edge of the lower plate (19) is hermetically connected with the lower end face of the cavity of the upper shell (1); the connecting part (18) is a cylinder formed by multiple sections of arcs, the inner part of the connecting part is a cavity, the lower end of the cavity is communicated with the inner cavity (8) of the buffer part (4), and the outer wall of the connecting part (18) and the inner wall of the upper shell (1) form a rough separation flow channel (21); a pore plate A (22) is arranged on the wall body of the connecting part (18), and the pore plate A (22) is positioned at the major arc position of the air inlet pipeline (2); the wall body of the connecting part (18) is also provided with a spacing block (23) for connecting the upper plate (17) and the lower plate (19), and the spacing block is positioned at the minor arc position of the air inlet pipeline (2) and the pore plate A (22); the rough separation flow channel (21) is connected with the cavity of the connecting part (18) through an upper orifice plate A (22); the oil return columns (20) are fixedly connected to the lower end face of the lower plate (19) and extend downwards into the outer cavity (9) of the buffer part (4); an oil return port (13) is formed in the oil return column (20) and is communicated with the coarse separation flow passage (21) and the outer cavity (9) of the buffer part (4); the filtering component is fixedly installed on one side of the cavity of the pore plate A (22) close to the connecting part (18).

3. The cylinder type high efficiency diesel oil and gas separator as set forth in claim 1, wherein: the buffer part (4) is of an inner-outer double-layer cavity structure and comprises an outer cavity (9) and an inner cavity (8), and the upper end face of the buffer part is rotatably connected with the upper end face of the lower shell (3); the upper end of the outer cavity (9) is communicated with the rough separation flow channel (21) through an oil return port (13) of the oil return column (20), the lower end of the outer cavity is a closed end, and the lower end face of the outer cavity is provided with the oil return port (13) which is communicated with the cavity of the lower shell (3); the upper end and the lower end of the inner cavity (8) are in an open state, and the upper end is communicated with the cavity of the upper filtering part main body (16).

4. The cylinder type high efficiency diesel oil and gas separator as set forth in claim 1, wherein: the lower filtering part (5) is fixedly connected to the lower end face of the buffering part (4), and a cavity is formed inside the lower filtering part; a partition plate (10) is arranged in the middle of the cavity of the lower filtering part (5), and the cavity of the lower filtering part is divided into a first filtering cavity (11) and a second filtering cavity (12); the upper end of the first filter cavity (11) is communicated with the inner cavity (8) of the buffer part (4), and the lowest end of the first filter cavity is provided with an oil return port (13) which is connected with the cavity of the lower shell (3); a cover plate (14) is arranged on the upper end face of the second filter cavity (12), is positioned between the second filter cavity (12) and the buffer part (4), and is provided with an oil return port (13) at the lowest end and is connected with the cavity of the lower shell (3); a flow limiting hole (15) is formed in the cover plate (14), and a one-way valve assembly is tightly attached to the lower portion of the flow limiting hole (15); a pore plate B (30) is arranged on the outer wall of the lower filtering part (5), and the included angle between the position of the pore plate B (30) and the position of the air outlet pipeline (6) is 180 degrees; the first filtering part and the second filtering part are communicated with the cavity of the lower shell (3) through a pore plate B (30); and a filtering component is arranged on the outer wall of one side of the cavity of the pore plate B (30), which is close to the lower shell (3).

5. The cylinder type high efficiency diesel oil and gas separator as set forth in claim 2 or 4, wherein: the filter assembly comprises a felt (24) and a felt baffle (25), wherein the felt (24) is arranged between the felt baffle (25) and the pore plate A (22) or the pore plate B (30), tightly attached to the felt baffle (25) and arranged at a gap with the pore plate A (22) or the pore plate B (30).

6. The oil and gas separator of a drum type high efficiency diesel engine as set forth in claim 2, wherein: a plurality of filtering holes (26) are uniformly distributed on the pore plate A (22), and the diameters of the cross sections of the filtering holes (26) are reduced along the gas flowing direction.

7. The cylinder type high efficiency diesel oil and gas separator as set forth in claim 4, wherein: a plurality of filtering holes (26) are uniformly distributed on the pore plate B (30), and the diameters of the cross sections of the filtering holes (26) are reduced along the gas flowing direction.

8. The cylinder type high efficiency diesel oil and gas separator as set forth in claim 1, wherein: and a sealing ring is arranged on the one-way valve main body (28).

Technical Field

The invention belongs to the technical field of oil-gas separation devices of diesel engines, and particularly relates to a roller type efficient oil-gas separator of a diesel engine.

Background

The main emissions of diesel engines are NOx and soot; when the diesel engine works, part of high-temperature and high-pressure gas leaks into the crankcase through the piston ring, so that the engine oil in the crankcase oil pan becomes thin and poor in performance, and after the oil-gas separator is installed, harmful gas in the crankcase can be discharged and the engine oil can be recovered, so that the service life of the engine oil is prolonged, and the engine oil is saved.

At present, an integrated oil-gas separator is externally hung on a valve chamber cover of a plurality of diesel engines, and after the oil-gas separator is integrated on the valve chamber cover, the position of an air outlet of the oil-gas separator is determined and has uniqueness; if the direction of the air outlet needs to be adjusted, the mold needs to be redesigned according to the structure of the diesel engine or the mold structure is adjusted and the difficulty of the mold is increased, so that the production cost, the manufacturing difficulty and the reliability are increased; in addition, the oil-gas separator in the prior art cannot automatically adjust the direction of the air flow according to the air leakage amount, and cannot give consideration to the separation effect and the pressure loss of the oil-gas separator under the condition of different air leakage amounts.

Disclosure of Invention

Aiming at the problems that in the prior art, the outlet position of the oil-gas separator is not adjustable, the universality of different machine types and the product series production are limited, and the separation effect and the pressure loss can not be ensured by automatically adjusting according to the air blowby quantity, the roller-type high-efficiency oil-gas separator for the diesel engine is provided.

The technical scheme of the invention is as follows:

the utility model provides a high-efficient diesel engine oil and gas separator of drum-type which characterized in that:

the filter comprises an upper separation assembly, a lower separation assembly and a filter body, wherein the upper separation assembly comprises an upper shell and an upper filter part; the upper shell is a cylindrical shell with a closed upper part and an open lower part, and the outer surface of the upper shell is fixedly connected with an air inlet pipeline; the upper filtering part is arranged in the upper shell;

the lower separation assembly comprises a lower shell, a buffer part and a lower filtering part; the lower shell is a cylindrical shell which is open at the top and closed at the bottom, the outer surface of the lower shell is fixedly connected with an air outlet pipeline, the upper end surface of the lower shell is rotatably connected with the lower end surface of the upper shell, and the lower end surface of the lower shell is provided with an oil return pipeline; the lower end of the buffer part is fixedly connected with the lower filtering part, and the buffer part and the lower filtering part are rotatably arranged in the lower shell;

the lower filtering part is internally provided with a cavity structure, and the cavity of the lower filtering part is divided into a first filtering cavity and a second filtering cavity by a partition plate; a cover plate is arranged between the upper end of the second filter cavity and the buffer part, and the lower end of the second filter cavity is communicated with the lower shell body through an oil return port; the cover plate is provided with a flow limiting hole, and a one-way valve component is arranged below the flow limiting hole; the one-way valve assembly comprises a guide post, a one-way valve body and a spring; the guide column is vertically and fixedly arranged in the cavity of the second filtering cavity, and the upper end of the guide column is connected with the one-way valve main body through a spring; under the non-working state, the upper end surface of the check valve main body is tightly attached to the lower end surface of the cover plate to seal the flow limiting hole.

Preferably, the upper filter house comprises an upper filter house body and a filter assembly; the upper filtering part main body comprises an upper plate, a connecting part, a lower plate and an oil return column; the upper plate and the lower plate are circular plates and are fixedly connected through a connecting part, and the edge of the lower plate is hermetically connected with the lower end face of the cavity of the upper shell; the connecting part is a cylinder formed by multiple sections of arcs, the inner part of the connecting part is a cavity, the lower end of the cavity is communicated with the inner cavity of the buffer part, and the outer wall of the connecting part and the inner wall of the upper shell form a rough separation flow channel; a pore plate A is arranged on the wall body of the connecting part and is positioned at the major arc position of the air inlet pipeline; the wall body of the connecting part is also provided with a spacing block for connecting the upper plate and the lower plate, and the spacing block is positioned at the minor arc positions of the air inlet pipeline and the pore plate A; the rough separation flow channel is connected with the connecting part cavity through an upper orifice plate A; the oil return columns are fixedly connected to the lower end face of the lower plate and extend downwards into the outer cavity of the buffer part; an oil return port is formed in the oil return column and is communicated with the coarse separation flow passage and the buffer part outer cavity; and the filtering assembly is fixedly installed on one side of the cavity of the pore plate A close to the connecting part.

Preferably, the buffer part is of an inner-outer double-layer cavity structure and comprises an outer cavity and an inner cavity, and the upper end face of the buffer part is rotatably connected with the upper end face of the lower shell; the upper end of the outer cavity is communicated with the coarse separation flow channel through an oil return port of the oil return column, the lower end of the outer cavity is a closed end, and the lower end face of the outer cavity is provided with an oil return port which is communicated with the lower cavity; the upper end and the lower end of the inner cavity are in an open state, and the upper end of the inner cavity is communicated with the cavity of the upper filtering part main body.

Preferably, the lower filtering part is fixedly connected with the lower end face of the buffering part, and a cavity is arranged inside the lower filtering part; a partition plate is arranged in the middle of the cavity of the lower filtering part, and the cavity of the lower filtering part is divided into a first filtering cavity and a second filtering cavity; the upper end of the first filter cavity is communicated with the inner cavity of the buffer part, and the lowest end of the first filter cavity is provided with an oil return port which is connected with the cavity of the lower shell; the upper end face of the second filter cavity is provided with a cover plate which is positioned between the second filter cavity and the buffer part, and the lowest end of the second filter cavity is provided with an oil return port which is connected with the cavity of the lower shell; the cover plate is provided with a flow limiting hole, and a check valve component is tightly attached to the lower part of the flow limiting hole; a pore plate B is arranged on the outer wall of the lower filtering part, and the included angle between the position of the pore plate B and the position of the air outlet pipeline is 180 degrees; the first filtering part and the second filtering part are communicated with the cavity of the lower shell through the pore plate B; and a filtering component is arranged on the outer wall of one side of the cavity of the pore plate B, which is close to the lower shell.

Preferably, the filter assembly comprises a felt and a felt baffle, wherein the felt is arranged between the felt baffle and the pore plate A or the pore plate B, is tightly attached to the felt baffle and is arranged at a gap with the pore plate A or the pore plate B.

Preferably, a plurality of filtering holes are uniformly distributed on the pore plate A, and the cross section diameter of each filtering hole is reduced along the gas flowing direction.

Preferably, a plurality of filtering holes are uniformly distributed on the pore plate B, and the cross section diameters of the filtering holes are reduced along the gas flowing direction.

Preferably, a sealing ring is arranged on the one-way valve main body.

Preferably, the cross-sectional area of the rough separation flow passage becomes gradually smaller from the position of the air inlet duct to the position of the orifice plate a.

Has the advantages that:

according to the technical scheme, compared with the prior art, the invention has the following advantages:

1. due to the arrangement of the oil return hole and the oil return channel, the situation that engine oil is accumulated and is brought out from the air outlet by airflow due to unsmooth oil return is avoided, and the engine oil can be effectively collected and refluxed through the special oil return channel;

2. the separation structures of the upper filter assembly and the lower filter assembly are designed, and the buffer part is designed between the two separation structures, so that when the upper and lower separation structures rotate freely, the buffer area can effectively stabilize air flow, and the pressure loss and the separation efficiency are ensured to be within the designed target range;

3. first filter chamber, second filter chamber and check valve subassembly's cooperation is used, has guaranteed: under the condition of small air leakage, the one-way valve is closed, and the side orifice plate of the first filtering cavity works, so that the phenomenon that the acceleration effect of the airflow is poor due to the excessive number of filtering holes is avoided, and the impact speed of the airflow after passing through the orifice plate is ensured; under the condition of a large amount of air blowby or normal air blowby, the one-way valve is opened, and the pore plates on the two sides work simultaneously, so that the excessive air flow pressure loss is avoided, and the reduction of the felt adsorption effect caused by the large air flow speed is also avoided;

4. the upper and lower separation design: under the condition that the mold is not required to be redesigned, the cost is increased, and the manufacturing difficulty is increased, the positions of the air inlet pipeline and the air outlet pipeline can be adjusted according to the difference of the spatial layout of the diesel engine, and the installation requirement is met.

In conclusion, the roller-type efficient oil-gas separator for the diesel engine solves the problems that in the prior art, the outlet position of the oil-gas separator is not adjustable, the universality of different engine types is limited, and automatic adjustment cannot be performed according to the air blowby amount to ensure the separation effect and the pressure loss.

Drawings

FIG. 1 is a perspective view of a drum-type high efficiency diesel oil and gas separator of the present invention;

FIG. 2 is a cross-sectional view taken along plane A-A of FIG. 1;

FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;

FIG. 4 is a top view of the upper filtering part of the drum type high efficiency diesel oil and gas separator of the present invention;

FIG. 5 is a top view of the lower filtering part of the drum type high efficiency diesel oil and gas separator of the present invention.

The labels in the figure are:

1. upper shell 2, air inlet pipe 3, lower shell 4, buffer part

5. Lower filtering part 6, air outlet pipeline 7, oil return pipeline 8, inner cavity

9. Outer cavity 10, partition 11, first filter cavity 12 and second filter cavity

13. Oil return port 14, cover plate 15, flow limiting hole 16, upper filter part main body

17. Upper plate 18, connecting part 19, lower plate 20, oil return column

21. Coarse separation flow passage 22, pore plate A23, spacing block 24 and felt

25. Felt baffle 26, filter hole 27, guide column 28, one-way valve body

29. Spring 30 orifice plate B

Detailed Description

The present invention will be described in further detail with reference to the following embodiments and the accompanying drawings.

A roller type high-efficiency diesel oil-gas separator comprises an upper filtering component and a lower filtering component. As shown in figure 1, during installation, the upper filter assembly and the lower filter assembly are rotatably connected and adjusted to proper positions, and then the relative positions of the upper filter assembly and the lower filter assembly are fixed in a welding mode, a bolt mode and the like.

As shown in fig. 2 and 3, the upper separation assembly includes an upper case 1 and an upper filter part. The upper shell 1 is a cylindrical shell with a closed upper end face and an opened lower end face, an air inlet pipeline 2 is fixedly connected to the side end face of the upper shell, and the air inlet pipeline 2 penetrates through the inner cavity of the upper shell 1.

The upper filter house includes an upper filter house body 16 and a filter assembly. The upper filter house body 16 is composed of an upper plate 17, a lower plate 19, a connecting portion 18, and an oil return column 20. The upper plate 17 and the lower plate 19 are circular plates and fixedly connected through a connecting part 18; the upper end surface of the upper plate 17 is tightly attached to the upper end surface of the cavity of the upper shell 1, and the lower end surface of the lower plate 19 is tightly attached to the lower end surface of the cavity of the upper shell 1 and is in sealing connection. As shown in fig. 4, the connecting portion 18 is a cylinder, the side end surface of the connecting portion is composed of multiple arcs, a cavity is formed inside the connecting portion, the multiple arcs enable the distance between the upper filtering portion main body 16 and the inside of the upper shell 1 to be gradually reduced from the position of the air inlet pipeline 2 to the position of the orifice plate a22, and the design is beneficial to ensuring pressure and flow speed and further ensuring separation effect when oil-gas separation is carried out; the lower end surface of the cavity of the connecting part 18 penetrates through the lower plate 19, and the upper end surface is sealed by the upper plate 17; an orifice a22 is provided on the side end surface of the connection portion 18, and an orifice a22 is located at the major arc position of the intake duct 2. As shown in fig. 4, the upper end surface of the lower plate 19 is provided with two oil return ports 13, which are distributed along the center symmetrically and are used for circulating and collecting separated oil drops. The filter assembly comprises felt 24 and felt baffle 25, wherein the felt 24 is arranged on the right side of the pore plate A22, is arranged at an interval with the pore plate A22 and is fixed by the felt baffle 25. The two sides of the separator assembly are likewise provided with oil return openings 13 for circulating collected oil droplets. As shown in fig. 2 and 4, the number of the return oil columns 20 is four, and the return oil columns are fixed to the lower end surface of the lower plate 19 below the four return oil ports 13, and the return oil ports 13 penetrate the return oil columns 20. As shown in fig. 4, the upper plate 17, the lower plate 19, the connecting portion 18 and the inner wall of the upper casing 1 together form a rough separation flow passage 21, and a spacing block 23 connecting the upper plate 17 and the lower plate 19 is arranged at a minor arc position of the intake duct 2 and the orifice plate a22, so that oil gas flows as a one-way flow passage and is sufficiently separated. Go up and rotate between casing 1 and the last filtering component and be connected, can adjust according to the separation demand.

As shown in fig. 2 and 3, the lower separation assembly includes a lower housing 3, a buffering part 4, and a lower filtering part 5. As shown in fig. 1, the lower housing 3 is a cylindrical housing with an open upper end surface and a closed lower end surface, and an air outlet pipe 6 is fixedly connected to the side end surface of the lower housing, the air outlet pipe 6 penetrates through the inner cavity of the lower housing 3, an oil return pipe 7 is fixedly connected to the lower end of the lower housing 3, and the oil return pipe 7 penetrates through the cavity of the lower housing 3.

As shown in fig. 2, the buffer part 4 is a circular cavity structure with two layers of inner and outer layers, and includes an inner cavity 8 and an outer cavity 9, and the upper end of the buffer part 4 is rotatably connected with the upper end of the lower shell 3. The upper end surface of the buffer part 4 is rotationally connected with the lower end surface of the lower plate 19, and four oil return columns 20 extend into the outer cavity 9 and are used for communicating the rough separation flow passage 21 with the outer cavity 9; the lower end surface of the outer cavity 9 is a closed end, and an oil return port 13 is arranged on the lower end surface and used for connecting the cavity of the lower shell 3 and the outer cavity 9; the upper and lower end faces of the inner cavity 8 are open, the upper end penetrates through the cavity of the upper filter part main body 16, and the lower end penetrates through the lower filter part 5. The design of buffer 4 can effectively guarantee that the air current is stabilized when filter house and lower filter house 5 free rotation, guarantees that loss of pressure and separation efficiency are in the design target within range.

As shown in fig. 2 and 5, the lower filter part 5 is a cylindrical housing, and is fixedly connected to the lower end of the buffer part 4, and the inner cavity thereof is connected to the inner cavity 8 of the buffer part 4. A partition plate 10 is arranged in the middle of the cavity of the lower filtering part 5, and divides the cavity into a first filtering cavity 11 and a second filtering cavity 12. The upper end of the first filter cavity 11 is communicated with the inner cavity 8 of the buffer part 4, and the lower end of the first filter cavity is provided with an oil return port 13 communicated with the inner cavity of the lower shell 3. The upper end face of the second filter cavity 12 is fixedly connected with a cover plate 14, and the cover plate 14 is positioned between the cavity 8 in the buffer part 4 and the second filter cavity 12 and plays a role in isolation and sealing. The cover plate 14 is provided with a limiting hole which is communicated with the second filter cavity 12 and the inner cavity 8 of the buffer part 4. The lower end surface of the second filter cavity 12 is provided with an oil return port 13 communicated with the cavity of the lower shell 3. The lower end of the restricted orifice 15 is fixedly mounted with a check valve assembly including a pilot post 27, a check valve body 28 and a spring 29. The lower end of the guide column 27 is vertically and fixedly arranged in the cavity of the second filter cavity 12, the upper end of the guide column is movably provided with a check valve main body 28, and the check valve main body 28 is connected with the guide column 27 through a spring 29. Under the condition of small air leakage, the spring 29 is tensioned, the check valve main body 28 is tightly attached to the flow limiting hole 15, the second filter cavity 12 does not work, and the first filter cavity 11 works independently, so that the impact speed of air flow is ensured; under normal gas channeling volume or big gas channeling volume, check valve main part 28 is strikeed by the air pressure and is opened, and first filter chamber 11 and second filter chamber 12 work simultaneously, avoid seeing pressure loss too big, have guaranteed the separation effect.

As shown in fig. 2, a perforated plate B30 is provided on the side end surface of the lower filter unit 5; during the installation, after confirming suitable pipeline 6 position of giving vent to anger, through rotatory lower filter 5 for the contained angle of orifice plate B30 position is 180 with the contained angle of pipeline 6 of giving vent to anger, guarantees the biggest separation stroke, guarantees the separation effect. The pore plate B30 is positioned on one side of the inner cavity 8 of the lower shell 3, and is provided with filter components at intervals, each filter component comprises a felt 24 and a felt baffle 25, the felt 24 is arranged on one side close to the pore plate B30, and the felt baffle 25 is arranged on the outer side of the felt 24 and plays a role in fixing and installing.

As the further optimization of the scheme, the cross sectional areas of the filtering holes 26 on the pore plate A22 and the pore plate B30 are gradually reduced along the flowing direction of the air flow, so that the flow velocity of the air flow is ensured, and the separation effect is further ensured.

As a further optimization of the scheme, a sealing ring is arranged on the check valve main body 28.

The working principle is as follows: the positions of the air inlet pipeline 2 and the air outlet pipeline 6 are adjusted according to the specific spatial layout of the diesel engine, the relative positions of the upper filtering part and the air inlet pipeline 2 and the relative positions of the lower filtering part 5 and the air outlet pipeline 6 are adjusted simultaneously, and all parts are fixedly connected in a welding mode, a bolt positioning mode and the like under the condition that the most effective effect is guaranteed. Gas to be separated enters the device through the gas inlet pipeline 2, is primarily separated through the coarse separation flow passage 21, and oil drops after separation are attached to the inner part of the coarse separation flow passage 21, flow downwards and are converged, and enter the outer cavity 9 of the buffer part 4 through the oil return port 13; the gas to be separated passes through the pore plate A22 of the upper filtering part, is separated by the filtering component and enters the inner cavity of the upper filtering part main body 16, and oil drops separated by the filtering component enter the inner part of the outer cavity 9 through the oil return ports 13 at two sides; oil drops in the outer cavity 9 enter the cavity of the lower shell 3 through the oil return port 13; the gas to be separated enters a buffer area, the gas flow is stabilized through the buffer area, the pressure loss and the separation efficiency are ensured, and the gas enters a lower filtering part 5; under the condition of small air leakage, the spring 29 is tensioned, the check valve main body 28 is tightly attached to the flow limiting hole 15, the second filter cavity 12 does not work, the first filter cavity 11 works independently, the gas to be separated is subjected to secondary separation through the single-side pore plate B30 of the lower filter part 5 and the filter assembly, and oil drops enter the cavity of the lower shell 3 through the oil return opening 13 of the first filter cavity 11; under normal air channeling quantity or large air channeling quantity, the check valve main body 28 is opened by the impact of the air flow pressure, the first filter cavity 11 and the second filter cavity 12 work simultaneously, the gas to be separated is subjected to secondary separation through the double-side pore plates B30 of the lower filter part 5 and the filter assembly, and oil drops enter the cavity of the lower shell 3 through the oil return ports 13 of the first filter cavity 11 and the second filter cavity 12; the separated gas is discharged through the gas outlet pipeline 6, and oil drops in the cavity of the lower shell 3 return oil through the oil return pipeline 7.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.