Cylinder head cover with oil-gas separation structure

Abstract

The invention relates to the technical field of engines, and provides a cylinder head cover with an oil-gas separation structure, which comprises a cover body and a cover body, an oil-gas separation cavity for mixed gas to flow is formed in the cover body, the cover body is installed on the cover body and covers the oil-gas separation cavity, and a gas outlet pipe is further arranged on the cover body; a coarse separation assembly and a fine separation assembly are arranged on the cover body; an air inlet is formed in the side, close to the coarse separation assembly, of the cover body, an oil return pipe is arranged on the side, close to the fine separation assembly, of the cover body, and both are located in the oil-gas separation cavity; mixed gas flows to the oil-gas separation cavity through the gas inlet, is subjected to primary separation through the coarse separation assembly and then is subjected to secondary separation through the fine separation assembly, the separated gas is discharged from the exhaust pipe, and attached oil drops are discharged from the oil return pipe. The oil-gas separation device has the effect of improving the oil-gas separation efficiency.

Description

Technical Field

[0001] This application relates to the field of engine technology, and in particular to a cylinder head cover with an oil-gas separation structure. Background Technology

[0002] With the rapid development of the internal combustion engine industry, exhaust pollution is increasingly threatening the human ecological environment. How to effectively reduce the emission of pollutants from internal combustion engine exhaust has become an important research topic in environmental protection worldwide. The main pollutants in internal combustion engine emissions come from the combustion of diesel fuel, with a smaller portion being engine oil. When the engine is running, the gases in the crankcase carry a small amount of engine oil into the combustion chamber for combustion. Because the engine oil cannot be completely burned, the exhaust gases negatively impact internal combustion engine emissions and the environment. Therefore, it is essential to improve the oil-gas separation efficiency of the cylinder head cover to separate more engine oil from the crankcase exhaust gases and allow it to flow back to the oil pan.

[0003] After the combustible mixture in some cylinders is burned, a large amount of high-temperature and high-pressure gas is produced. Some of this gas will sneak into the crankcase through the gap between the piston rings and the cylinder wall, forming crankcase blow-by. The blow-by gas contains a large amount of oil vapor. If it is directly discharged into the atmosphere, it will not only waste oil but also pollute the environment. At the same time, the oil vapor will also dilute the air-fuel mixture, affecting the engine's combustion efficiency and power performance.

[0004] Therefore, as an important component of the engine, the cylinder head cover usually integrates an oil-gas separation function to separate the oil vapor from the gas in the blow-by gas, thereby realizing oil recovery and gas purification and emission. Summary of the Invention

[0005] To address the aforementioned issues, this application provides a cylinder head cover with an oil-gas separation structure.

[0006] The cylinder head cover with an oil-gas separation structure provided in this application adopts the following technical solution: A cylinder head cover with an oil-gas separation structure includes a cover body and a cover body. An oil-gas separation chamber for the flow of mixed gas is opened in the cover body. The cover body is installed on the cover body and covers the oil-gas separation chamber. An exhaust pipe is also provided on the cover body. A coarse separation component and a fine separation component are provided on the cover body. An air inlet is provided on the side of the cover body near the coarse separation component, and an oil return pipe is provided on the side of the cover body near the fine separation component. Both are located in the oil-gas separation chamber. The mixed gas flows to the oil-gas separation chamber through the air inlet, undergoes a first separation by the coarse separation component, and then undergoes a second separation by the fine separation component. The separated gas is discharged from the exhaust pipe, and the attached oil droplets are discharged from the oil return pipe.

[0007] By adopting the above technical solution, when the mixed gas flows from the inlet into the oil-gas separation chamber, the airflow is blocked by the coarse separation component. The airflow comes into contact with the coarse separation component and flows around it, while most of the oil droplets adhere to the coarse separation component. The remaining oil droplets follow the airflow to the fine separation component, where they adhere to the remaining oil droplets and converge into larger droplets before flowing to the return oil pipe. The gas then passes through the fine separation component and is discharged through the exhaust pipe. This improves the separation efficiency through the coarse and fine separation components, achieving efficient oil-gas separation.

[0008] Optionally, the coarse separation component includes several serpentine baffles.

[0009] By adopting the above technical solution, when the gas flows to the serpentine baffle, the airflow can flow along the arc surface, and the blocked airflow can also fully contact the serpentine baffle, so that the oil droplets can adhere to the surface of the serpentine baffle.

[0010] Optionally, the serpentine baffles can be arranged in two ways: a relative baffle group consisting of two serpentine baffles facing each other and a single baffle group. Adjacent relative baffle groups are separated by single baffle groups to form a serpentine channel for gas flow.

[0011] By adopting the above technical solution, the arrangement of relative baffle groups and single baffle groups allows the mixed gas to be blocked or intercepted multiple times during the flow process. The gas is guided by the arc surface of the serpentine baffle, causing the gas to flow back in the opposite direction. The returning gas flow then contacts the previous relative baffle group, thereby increasing the overall number of gas contacts and improving the oil-gas separation efficiency.

[0012] Optionally, the serpentine baffles arranged in a group of opposing baffles are also provided with a pivot shaft, which is pivotally connected to the cover. The serpentine baffles deflect through the pivot shaft. The pivot shaft is provided with an elastic part, which provides elastic force for the rotation of the serpentine baffles. The cover is provided with a limiting part, which abuts against the serpentine baffles. The limiting part provides a path that restricts the rotation of the serpentine baffles.

[0013] By adopting the above technical solution, the pivot shaft is provided with elastic force by setting an elastic part, which causes the pivot shaft to drive the serpentine baffles of the relative baffle group to rotate, thereby adjusting the distance between the relative baffle group and the single baffle group, and realizing the adjustment of the width of the serpentine channel.

[0014] Optionally, the elastic force of the elastic part is directed to drive the relative baffle group to rotate away from the single baffle group and to press against the limiting part. When the air pressure increases, it pushes the relative baffle to rotate towards the single baffle group, thereby changing the width of the serpentine channel.

[0015] By adopting the above technical solution, when the air pressure increases, the airflow speed through the serpentine channel will be faster, making it impossible for some oil droplets to adhere to the serpentine baffle. Therefore, the air pressure is used to rotate the relative baffle group towards the single baffle group, narrowing the channel entrance of the serpentine channel, so that the airflow needs to flow through a smaller and narrower channel, making it easier for oil droplets to adhere to the serpentine baffle. This achieves different air delivery widths adapted to air pressure, so as to ensure the efficiency of oil-gas separation.

[0016] Optionally, the fine separation component includes a filter plate, a filter frame, and filter cotton; two sets of filter plates are provided, which are set on the cover at a preset distance and separate the oil-gas separation chamber; the filter plates are provided with a number of filter holes, the filter frame is inserted between the two filter plates, and filter cotton is provided in the filter frame.

[0017] By adopting the above technical solution, after the mixed gas undergoes preliminary oil-gas separation through the coarse separation component, it flows to the filter plate. The filter plate then flows into the filter frame and filter cotton through the filter holes. Through the filtration of the filter frame and filter cotton, the oil and gas are separated a second time to improve the separation efficiency.

[0018] Optionally, an air passage is provided between the filter cotton and the filter holes.

[0019] By adopting the above technical solution, after the mixed gas enters the filter hole, it is blocked and adhered by the oil droplet filter cotton, and then the gas flows along the ventilation channel to ensure the stability of the gas flow.

[0020] Optionally, the filter plate is divided into a high-level section and a low-level section along the vertical direction, with the filter holes and filter frame located in the high-level section.

[0021] By adopting the above technical solution, when the mixed gas flows, it will collide with the lower section of the filter plate, causing oil droplets to adhere to the lower section. The remaining gas flows around the lower section to the filter holes of the upper section, and is then intercepted by the filter frame and filter cotton. The remaining oil droplets adhere to the filter cotton and flow through the ventilation channel. By utilizing the height difference, the oil droplets are intercepted, thereby improving the efficiency of secondary separation.

[0022] Optionally, a drop plate is also provided on the cover, which is located in the lower section near the return oil pipe on one side.

[0023] By adopting the above technical solution, the drop plate allows the gas falling from the ventilation channel to flow around the drop plate again, so as to achieve another high-low drop interception, thereby achieving further oil-gas separation.

[0024] Optionally, the bottom surface of the cover body is inclined, and the oil return pipe is located at the end of the inclined surface.

[0025] By adopting the above technical solution, the oil droplets that fall onto the inclined surface are affected by gravity and wind speed, and flow along the inclined surface into the oil return pipe, so as to ensure smooth oil droplet recovery.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. When the mixed gas flows from the inlet into the oil-gas separation chamber, the airflow is blocked by the coarse separation component. The airflow comes into contact with the coarse separation component and flows around it. Most of the oil droplets adhere to the coarse separation component, while the remaining oil droplets follow the airflow to the fine separation component. The fine separation component adheres to the remaining oil droplets and gathers them into large oil droplets, which then flow to the return oil pipe. The gas passes through the fine separation component and is discharged through the exhaust pipe. Thus, the separation efficiency is improved by the coarse and fine separation components, achieving the function of efficient oil-gas separation. 2. When the gas flows to the serpentine baffle, the airflow can flow along the arc surface, and the blocked airflow can also fully contact the serpentine baffle, so that the oil droplets can adhere to the surface of the serpentine baffle. 3. By utilizing the arrangement of relative baffle groups and single baffle groups, the mixed gas is blocked or intercepted multiple times during the flow process. The gas is guided by the arc surface of the serpentine baffle, causing the gas to flow back in the opposite direction. The returning gas flow comes into contact with the previous relative baffle group, thereby increasing the overall number of gas contacts and improving the oil-gas separation efficiency. 4. By setting an elastic part to provide elastic force to the pivot shaft, the pivot shaft drives the serpentine baffles of the relative baffle group to rotate, thereby adjusting the distance between the relative baffle group and the single baffle group, and realizing the adjustment of the width of the serpentine channel. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of the cylinder head cover in a top view according to one embodiment of this application; Figure 2 This is a three-dimensional structural diagram of the cylinder head cover in some embodiments of this application, viewed from below. Figure 3 This is a schematic cross-sectional view of the cylinder head cover in some embodiments of this application; Figure 4 This is a schematic diagram of the first cross-sectional structure of the coarse separation component in some embodiments of this application; Figure 5 This is a schematic diagram of a second cross-sectional structure of the coarse separation component in some embodiments of this application; Figure 6 This is a schematic diagram of a third cross-sectional structure of the coarse separation component in some embodiments of this application; Figure 7 This is a cross-sectional structural schematic diagram of the fine separation component in some embodiments of this application; Figure 8 This is a schematic diagram of gas flow in the fine separation component in some embodiments of this application; Figure 9 This is a schematic diagram of the cylinder head cover in a side view of some embodiments of this application; The labels in the attached diagram are as follows: 1. Cover body; 11. Oil-gas separation chamber; 12. Air outlet pipe; 2. Cover body; 21. Oil return pipe; 22. Air inlet; 3. Coarse separation assembly; 31. Serpentine baffle; 32. Relative baffle group; 33. Single baffle group; 34. Pivot shaft; 35. Elastic part; 36. Limiting part; 4. Fine separation assembly; 41. Filter plate; 411. Filter hole; 412. High-level section; 413. Low-level section; 42. Filter frame; 43. Filter cotton; 44. Drop plate. Detailed Implementation

[0028] The following specific examples illustrate the implementation methods of this application. Those skilled in the art can easily understand other advantages and effects of this application from the information disclosed herein. This application can also be implemented or applied through other different specific embodiments, and various details in this application can be modified or changed according to different viewpoints and application systems without departing from the spirit of this application. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0029] The embodiments of this application will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily implement the application. This application may be embodied in many different forms and is not limited to the embodiments described herein.

[0030] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics represented in connection with that embodiment or example, which are included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics represented may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate different embodiments or examples represented in this application, as well as features of different embodiments or examples.

[0031] Furthermore, the terms "first" and "second" are used only to indicate an objective and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the representation of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0032] Throughout this specification, when it is said that a device is "connected" to another device, this includes not only "direct connection" but also "indirect connection" by placing other components in between. Furthermore, when it is said that a device "comprises" a certain constituent element, unless otherwise stated otherwise, this does not exclude other constituent elements, but rather implies that other constituent elements may be included.

[0033] The following is in conjunction with the appendix Figure 1 -Appendix Figure 9 This application will be described in further detail below.

[0034] This application discloses a cylinder head cover with an oil-gas separation structure.

[0035] A cylinder head cover with an oil-gas separation structure, reference Figure 1 and Figure 2 As shown, it includes a cover 1 and a cover 2. The cover 1 has an oil-gas separation chamber 11 for the flow of mixed gas. The cover 2 is installed on the cover 1 and covers the oil-gas separation chamber 11, so that the oil-gas separation chamber 11 is intact. The mixed gas is rich in oil droplets or oil particles and flows through the oil-gas separation chamber 11 with the airflow.

[0036] The cover 2 is equipped with a coarse separation component 3 and a fine separation component 4. When the mixed gas flows, it passes through the coarse separation component 3 and the fine separation component 4. The coarse separation component 3 provides preliminary separation of oil and gas in the mixed gas, so that after the mixed gas passes through the coarse separation component 3, it passes through the fine separation component 4 for secondary separation to ensure separation efficiency.

[0037] The cover 2 has an air inlet 22 on the side near the coarse separation component 3 and an oil return pipe 21 on the side near the fine separation component 4, both located inside the oil-gas separation chamber 11. The cover 1 is provided with an air outlet pipe 12, so that the flow path of the mixed gas is either the air inlet 22, the coarse separation component 3, the fine separation component 4, the oil return pipe 21 or the air outlet pipe 12. The air outlet pipe 12 and the oil return pipe 21 have a height difference, so that oil droplets cannot be discharged through the air outlet pipe 12 located on the cover 1 at a higher position.

[0038] When the mixed gas flows from the inlet 22 into the oil-gas separation chamber 11, the airflow is blocked by the coarse separation component 3. The airflow comes into contact with the coarse separation component 3 and flows around it. Most of the oil droplets adhere to the coarse separation component 3, while the remaining oil droplets follow the airflow to the fine separation component 4. The fine separation component 4 adheres to the remaining oil droplets and gathers them into large oil droplets, which then flow to the return oil pipe 21. The gas passes through the fine separation component 4 and is discharged through the exhaust pipe. Thus, the separation efficiency is improved by the coarse separation component 3 and the fine separation component 4, achieving the effect of efficient oil-gas separation.

[0039] Further reference Figure 3As shown, the coarse separation component 3 includes several serpentine baffles 31. The serpentine baffles 31 have an S-shaped curved surface. Therefore, when the gas flows to the serpentine baffles 31, the airflow can flow along the curved surface. At the same time, the blocked airflow can also fully contact the serpentine baffles 31, so that oil droplets can adhere to the surface of the serpentine baffles 31. Setting several serpentine baffles 31 can form multiple interception or blocking paths to improve the oil-gas separation efficiency.

[0040] Furthermore, refer to Figure 4 and Figure 5 As shown, the serpentine baffles 31 are arranged in two ways: a relative baffle group 32 consisting of two serpentine baffles 31 arranged opposite each other, and a single baffle group 33. The relative baffle group 32 is arranged opposite each other with a gap in the middle to allow the mixed gas to flow, while the single baffle group 33 is a single serpentine baffle 31 located behind the gap in the relative baffle group 32.

[0041] Adjacent relative baffle groups 32 are separated by single baffle groups 33, forming a serpentine channel for gas flow. That is, the arrangement of one set of relative baffle groups 32 and one set of single baffle groups 33, and another set of relative baffle groups 32 and one set of single baffle groups 33, allows the airflow to flow through the gaps between the relative baffle groups 32, be blocked by the single baffle groups 33, and then flow to both sides through their arc-shaped surfaces. After flowing to both sides, it encounters another set of relative baffle groups 32, and the airflow is intercepted by the relative baffle groups 32 again, and oil droplets are attached again. This is set up in a cycle.

[0042] At the same time, the gas can achieve a recirculation effect due to the curved arc surface of the serpentine baffle 31. That is, when the gas flows to the single baffle group 33, the curved arc surface of the single baffle group 33 guides the gas and forms a recirculation effect, so that the airflow contacts the back of the previous relative baffle group 32 again and returns to the next relative baffle group 32.

[0043] The specific number of baffles can be determined according to the space and requirements of the oil-gas separation chamber 11, and is not limited here. Taking the setting of two sets of opposing baffle groups 32 and one set of single baffle groups 33 as an example, there are a total of five serpentine baffles 31.

[0044] Specifically, by utilizing the arrangement of the relative baffle group 32 and the single baffle group 33, the mixed gas is blocked or intercepted multiple times during the flow process. The gas is guided by the arc surface of the serpentine baffle 31, causing the gas to flow back in the opposite direction. The returning airflow then contacts the previous relative baffle group 32, thereby increasing the overall number of gas contacts and improving the oil-gas separation efficiency.

[0045] In some embodiments, reference Figure 5As shown, the serpentine baffles 31 arranged in the opposite baffle group 32 are also provided with a pivot shaft 34. The pivot shaft 34 is pivotally connected to the cover 2. The serpentine baffles 31 deflect through the pivot shaft 34. After the pivot shaft 34 is set, the serpentine baffles 31 and the pivot shaft 34 are fixedly connected. Therefore, the serpentine baffles 31 can rotate through the pivot shaft 34. The pivot connection between the pivot shaft 34 and the cover 2 can be achieved by opening a pivot groove on the cover 2, inserting the pivot shaft 34 into the pivot groove, and then rotating along the pivot groove to achieve the pivot connection.

[0046] The pivot shaft 34 is provided with an elastic part 35, which provides elastic force for the rotation of the serpentine baffle 31. The elastic part 35 can be a torsion spring, which provides elastic force for the rotation of the pivot shaft 34. The cover 2 is provided with a limiting part 36, which can be a limiting block. The serpentine baffle 31 abuts against the limiting part 36, and the limiting part 36 provides a limiting path for the rotation of the serpentine baffle 31 to avoid the serpentine baffle 31 rotating too much.

[0047] Specifically, by providing elastic force to the pivot shaft 34 through the elastic part 35, the pivot shaft 34 drives the serpentine baffle 31 of the relative baffle group 32 to rotate, thereby adjusting the distance between the relative baffle group 32 and the single baffle group 33, and realizing the adjustment of the width of the serpentine channel or the width of the gas flow channel.

[0048] Furthermore, after setting the pivot shaft 34 and the elastic part 35, there are three implementation methods. The first implementation method is that the elastic force of the elastic part 35 is in the direction of the drive shaft toward the single baffle group 33, so that the relative baffle group 32 and the single baffle group 33 abut against each other. In this way, according to the gas flow and air pressure, as the air pressure increases, the relative baffle is pushed away from the single baffle group 33, thereby gradually increasing the width of the flow path. The higher the air pressure, the smoother the flow. This method is mainly suitable for gentle flow and ensures the stability of the flow.

[0049] In this method, the airflow direction must be from the single baffle group 33 to the opposite baffle group 32 in order for the airflow to push the opposite baffle group 32 away from the single baffle group 33.

[0050] In the second embodiment, the elastic force of the elastic part 35 drives the relative baffle to rotate away from the single baffle group 33 and abut against the limiting part 36, so that the initial position of the relative baffle group 32 is separated from the single baffle group 33 and has a larger air delivery width. This method can not affect the flow of air when the air pressure is flat, but when the air pressure increases, the air pressure drives the airflow to push the relative baffle to rotate towards the single baffle group 33, changing the width of the serpentine channel. Changing the path narrows the width of the serpentine channel, reducing the air delivery volume. The lower air delivery volume means that the airflow needs to be delivered from a smaller width.

[0051] The purpose of this method is that when the air pressure increases, the airflow speed through the serpentine channel will be faster, making it impossible for some oil droplets to adhere to the serpentine baffle 31. Therefore, the air pressure is used to rotate the relative baffle group 32 towards the single baffle group 33, narrowing the multi-channel inlet of the serpentine channel. This forces the airflow to flow through a smaller and narrower channel. When the gas flow speed is too fast, the oil droplets following it enter the narrower channel inlet, making it easier for the oil droplets to adhere to the serpentine baffle 31. Therefore, although this method reduces the smoothness of gas delivery, it can adapt to different gas delivery widths according to the air pressure to ensure the efficiency of oil-gas separation.

[0052] The serpentine baffle 31 can have a connecting port (not shown in the figure). The connecting port ensures that when the relative baffle group 32 rotates to the single baffle group 33, the gap between the two is too small and affects the gas flow, but the gas can flow through the connecting port to ensure the stability of the airflow. At the same time, an inverted L-shaped connecting baffle can be set at the connecting port. The connecting baffle allows the gas to flow along the L-shaped path, further blocking the airflow to attach oil droplets while ensuring the continuity of the gas flow path.

[0053] The number of limiting parts 36 required for the serpentine baffle 31 corresponding to a single relative baffle group 32 can be two or more, located on both sides of the relative baffle group 32, to restrict the rotation path of the serpentine baffle 31 on both sides, forming a fan shape with a small angle, such as 30 degrees, so that the relative baffle group 32 and the single baffle group 33 do not contact each other, ensuring that there is a minimum gap between the relative baffle group 32 and the single baffle group 33, so that even if the air pressure is high, it can still flow and transport through the serpentine channel or flow channel between the relative baffle group 32 and the single baffle group 33.

[0054] The third method is, as referenced Figure 5 and Figure 6 As shown, adjacent relative baffle groups 32 rotate in opposite directions. The specific rotation direction can be determined according to the airflow direction. If the airflow is transported in one direction, the relative baffle group 32 that comes into contact first will rotate towards the single baffle group 33 due to the influence of atmospheric pressure. When the gas flows to another set of adjacent relative baffle groups 32, the baffle will face the single baffle group 33. When the air pressure is too high, it will push the relative baffle group 32 away from the single baffle group 33. This achieves the effect of pushing the relative baffle group 32 apart by air pressure when the air pressure is high, thus widening the outlet of the serpentine channel. This design with opposite relative rotation directions allows the airflow and air pressure to adjust the rotation angle of adjacent relative baffle groups 32 in sequence. The relative baffle group 32 that comes into contact first, together with the single baffle group 33 in a fixed position, narrows the inlet of the serpentine channel, while the adjacent relative baffle groups 32 widen the outlet, thereby improving the oil-gas separation efficiency when subjected to high air pressure.

[0055] Figure 5This represents the position of the serpentine baffle 31 under normal air pressure and normal flow rate. Figure 6 When the air pressure is relatively high, the serpentine baffle 31 rotates due to the pressure and airflow. The arrows in the figure indicate the airflow direction. The airflow direction is for reference only. The specific airflow direction can be determined based on the actual positions of the air inlet 22 and the air outlet 12.

[0056] In some embodiments, reference Figure 7 As shown, the fine separation component 4 includes a filter plate 41, a filter frame 42, and a filter cotton 43; two sets of filter plates 41 are provided, which are set on the cover 2 at a preset distance and separate the oil-gas separation chamber 11, and a space for the filter frame 42 to be installed is formed between the two filter plates 41. Several filter holes 411 are opened on the filter plates 41, and the airflow can pass through the two filter plates 41 through the several filter holes 411.

[0057] The filter frame 42 is inserted between two filter plates 41. The opposing surfaces of the two filter plates 41 can be provided with protrusions. The protrusions can be located in the middle of the filter plates 41 or at a position that matches the height of the filter frame 42. Therefore, when the filter frame 42 is inserted into the filter plates 41, it can abut against the protrusions to provide support.

[0058] The filter frame 42 is equipped with filter cotton 43, which can be made of felt. The disordered arrangement inside the felt allows the oil mist to jump down at a certain speed and disperse on the surface of the felt. When the oil mist is obstructed and turns, the centrifugal force causes the oil droplets to adhere to the surface of the felt. Some oil droplets will aggregate from small particles into large particles. The oil droplets attached to the surface of the felt fall into the oil-gas separation chamber 11 under the influence of gravity and wind speed.

[0059] Specifically, after the mixed gas undergoes preliminary oil-gas separation through the coarse separation component 3, it flows to the filter plate 41. The filter plate 41 flows into the filter frame 42 and filter cotton 43 through the filter holes 411. Through the filtration of the filter frame 42 and filter cotton 43, the oil and gas are separated a second time to improve the separation efficiency.

[0060] Further reference Figure 8 As shown, a ventilation channel is provided between the filter cotton 43 and the filter hole 411. That is, the gap between the filter cotton 43 and the filter hole 411 creates a channel for gas flow, which is the ventilation channel. The width of the channel can be 2.5-3mm, and the diameter of the filter hole 411 can be 2.5mm to ensure stable gas flow.

[0061] Furthermore, refer to Figure 8As shown, the filter plate 41 is divided into a high-level section 412 and a low-level section 413 in the vertical direction. The protrusions can be used as a reference for division in the figure. The filter holes 411 and the filter frame 42 are located in the high-level section 412. After the filter plate 41 is set with high-level section 412 and low-level section 413, the gas flow path is determined. The gas needs to pass through the filter holes 411 of the high-level section 412 to flow. However, the mixed gas contains oil mist or oil droplets, so the overall weight is relatively large. When flowing, it will directly hit the low-level section 413 of the filter plate 41, causing the oil droplets to adhere to the low-level section 413. The gas side bypasses the low-level section 413 and flows to the filter holes 411 of the high-level section 412. Then, it is intercepted by the filter frame 42 and the filter cotton 43. The remaining oil droplets adhere to the filter cotton 43 and flow through the ventilation channel. This method uses the height difference to intercept the oil droplets, thereby improving the efficiency of secondary separation.

[0062] Furthermore, the cover 2 is also equipped with a drop plate 44, which is located near the return oil pipe 21 on one side of the lower section 413. The drop plate 44 allows the gas falling from the ventilation channel to bypass the drop plate 44 and flow again, so as to achieve another high-low drop interception, thereby achieving further oil-gas separation.

[0063] The arrows in the diagram indicate the direction of airflow.

[0064] Furthermore, refer to Figure 9 As shown, the bottom surface of the cover 2 is an inclined surface, and the oil return pipe 21 is located at the end of the inclined surface. The inclined surface of the cover 2 allows oil droplets attached to the serpentine baffle 31, filter plate 41, filter cotton 43 and drop plate 44 to gather and drip onto the inclined surface under the action of gravity and wind speed. The oil droplets on the inclined surface are also affected by gravity and wind speed and flow along the inclined surface into the oil return pipe 21 to ensure smooth oil droplet recovery.

[0065] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be included within the scope of protection of this application.

Claims

1. A cylinder head cover with an oil-gas separation structure, characterized in that, It includes a cover (1) and a cover (2); the cover (1) has an oil-gas separation chamber (11) for the flow of mixed gas, the cover (2) is installed on the cover (1) and covers the oil-gas separation chamber (11), and the cover (1) is also provided with an exhaust pipe (12); the cover (2) is provided with a coarse separation component (3) and a fine separation component (4); the cover (2) is provided with an air inlet (22) on the side near the coarse separation component (3), and a return oil pipe (21) on the side near the fine separation component (4), and both are located in the oil-gas separation chamber (11); the mixed gas flows to the oil-gas separation chamber (11) through the air inlet (22), undergoes a first separation through the coarse separation component (3), and then undergoes a second separation through the fine separation component (4), the separated gas is discharged from the exhaust pipe, and the attached oil droplets are discharged from the return oil pipe (21).

2. A cylinder head cover with an oil-gas separation structure according to claim 1, characterized in that, The coarse separation component (3) includes several serpentine baffles (31).

3. A cylinder head cover with an oil-gas separation structure according to claim 2, characterized in that, There are two types of serpentine baffles (31): a relative baffle group (32) consisting of two serpentine baffles (31) arranged opposite each other, and a single baffle group (33). A single baffle group (33) is provided between adjacent relative baffle groups (32) to form a serpentine channel for gas flow.

4. A cylinder head cover with an oil-gas separation structure according to claim 3, characterized in that, The serpentine baffles (31) arranged in a relative baffle group (32) are also provided with a pivot shaft (34), which is pivotally connected to the cover (2). The serpentine baffles (31) deflect through the pivot shaft (34). The pivot shaft (34) is provided with an elastic part (35), which provides elastic force for the rotation of the serpentine baffles (31). The cover (2) is provided with a limiting part (36), which abuts against the serpentine baffles (31). The limiting part (36) provides a limiting path for the rotation of the serpentine baffles (31).

5. A cylinder head cover with an oil-gas separation structure according to claim 4, characterized in that, The elastic force of the elastic part (35) is to drive the relative baffle group (32) to rotate away from the single baffle group (33) and press against the limiting part (36). When the air pressure increases, it pushes the relative baffle to rotate towards the single baffle group (33), thereby changing the width of the serpentine channel.

6. A cylinder head cover with an oil-gas separation structure according to any one of claims 1-5, characterized in that, The fine separation component (4) includes a filter plate (41), a filter frame (42), and filter cotton (43); the filter plate (41) is provided in two sets, which are set on the cover (2) at a preset distance and separate the oil-gas separation chamber (11); the filter plate (41) is provided with a number of filter holes (411), the filter frame (42) is inserted between the two filter plates (41), and the filter cotton (43) is provided in the filter frame (42).

7. A cylinder head cover with an oil-gas separation structure according to claim 6, characterized in that, An air passage is provided between the filter cotton (43) and the filter hole (411).

8. A cylinder head cover with an oil-gas separation structure according to claim 7, characterized in that, The filter plate (41) is divided into a high-level section (412) and a low-level section (413) in the vertical direction. The filter holes (411) and the filter frame (42) are located in the high-level section (412).

9. A cylinder head cover with an oil-gas separation structure according to claim 8, characterized in that, The cover (2) is also provided with a drop plate (44), which is located in the lower section (413) near the return oil pipe (21) on one side.

10. A cylinder head cover with an oil-gas separation structure according to claim 1, characterized in that, The bottom surface of the cover (2) is inclined, and the return oil pipe (21) is located at the end of the inclined surface.

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