Oil-gas separator

Abstract

The utility model relates to an oil-gas separator, which is integrated on a cylinder head cover and comprises a shell and a separation and adsorption unit arranged in a cavity formed by the shell. The shell comprises an upper shell body and a lower shell body, a plurality of baffle units are arranged on the inner side of the upper shell body, and each baffle unit is used for separating engine oil particles with the first diameter in oil-gas mixed gas. The separation and adsorption unit is connected with the upper shell and used for separating engine oil particles with the second diameter in the oil-gas mixture. In the invention, the first diameter is greater than the second diameter. According to the oil-gas separator, engine oil particles with different diameters can be captured, and the separation efficiency of the oil-gas separator is improved. According to the engine oil filtering device, oil drops with different volumes can be effectively recycled, and the filtering efficiency of engine oil is improved. In addition, the oil-gas separator is integrated on the cylinder head cover, the size and complexity of the oil-gas separator are reduced, and the oil-gas separator is easy to implement and high in applicability.

Description

Technical Field

[0001] The present invention relates to the technical field of engine crankcase ventilation, in particular to an oil-gas separator. Background Art

[0002] The engine crankcase ventilation system is a vital component of the engine. When the engine is operating, high-temperature, high-pressure combustible gases and mixed gases in the combustion chamber enter the crankcase through the gap between the piston ring assembly and the cylinder block. This can accelerate the oxidation and deterioration of the engine oil, forming sludge that blocks the oil flow and causes increased wear and corrosion of engine components.

[0003] Existing technologies primarily incorporate an oil-gas separator assembly within the engine crankshaft ventilation system. This filter filters the oil-gas mixture within the cylinder head cover or crankcase, exhausts the filtered gas into the atmosphere or reburns it, and returns the filtered oil to the oil sump assembly. However, this current filtration method suffers from low filtration efficiency, resulting in filtered products that do not meet testing requirements and poor filtration results. Utility Model Content

[0004] Based on this, it is necessary to provide an oil-gas separation device with good filtering effect and high filtering effect to address the problem that the current oil-gas mixture filtering efficiency is low and the effect is poor.

[0005] The present application proposes an oil-gas separator, which is integrated on a cylinder head cover and includes:

[0006] The housing comprises an upper housing and a lower housing, wherein the inner side of the upper housing comprises a plurality of baffle units, and the baffle units are used to separate oil particles of a first diameter;

[0007] The separation adsorption unit is arranged in the cavity formed by the shell, and the separation adsorption unit is connected to the upper shell, and is used to separate oil particles of a second diameter; wherein the first diameter is larger than the second diameter.

[0008] In some embodiments, the separation adsorption unit includes a separation plate and an adsorption layer, the separation plate is connected to the upper shell, and the adsorption layer is connected to the separation plate.

[0009] In some embodiments, the upper shell includes a separation plate mounting slot, and the separation plate is connected to the upper shell through the separation plate mounting slot.

[0010] In some embodiments, the separation plate includes a connecting member, and the adsorption layer is connected to the separation plate via the connecting member.

[0011] In some embodiments, the separation holes are evenly distributed on the separation plate, and the sizes of the separation holes are the same.

[0012] In some embodiments, the adsorption layer is rectangular.

[0013] In some embodiments, the baffle unit includes at least one of a baffle labyrinth or ribs.

[0014] In some embodiments, when the baffle unit is a baffle maze, the upper shell includes a plurality of baffle mazes, and each baffle maze is arranged in a different manner.

[0015] In some embodiments, the lower shell includes an air inlet for absorbing an initial oil-air mixture; the upper shell includes an air outlet for discharging the separated oil-air mixture.

[0016] In some embodiments, the lower housing includes an oil return passage.

[0017] The above-mentioned oil-gas separator is integrated on the cylinder head cover, and includes a shell and a separation adsorption unit arranged in a cavity formed by the shell. The shell includes an upper shell and a lower shell, and the inner side of the upper shell includes several groups of baffle units, each group of baffle units is used to separate oil particles of a first diameter in the oil-gas mixture. The separation adsorption unit is connected to the upper shell and is used to separate oil particles of a second diameter in the oil-gas mixture. In the present application, the first diameter is greater than the second diameter. The oil-gas separator of the present application can capture oil particles of different diameters, thereby improving the separation efficiency of the oil-gas separator. The present application can effectively recover oil droplets of different volumes, thereby improving the filtration efficiency of the oil. In addition, the present application integrates the oil-gas separator on the cylinder head cover, reducing the volume and complexity of the oil-gas separator, making it easy to implement and highly applicable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figures 1a to 1d This is an exploded view of the oil-gas separator assembly in one embodiment;

[0020] Figure 2 This is a schematic diagram of the interior of the upper housing in one embodiment;

[0021] Figure 3 This is an exploded view of the separation adsorption unit in one embodiment;

[0022] Figure 4a and Figure 4b is a schematic diagram of a lower housing in one embodiment;

[0023] Figure 5A schematic diagram of the assembly of an oil-gas separator and a cylinder head cover in one embodiment;

[0024] Figure 6 This is a schematic diagram of the oil and gas separation principle in one embodiment;

[0025] Figure 7 Schematic diagram of the oil and gas separation principle in another embodiment.

[0026] Description of reference numerals:

[0027] 100, upper shell; 112, first baffle maze; 114, second baffle maze; 116, third baffle maze; 122, first transverse rib; 130, separation plate mounting groove; 140, air outlet; 150, sealing rib; 200, separation plate; 210, separation hole; 220, oil return port; 230, snap fastener; 300, adsorption layer; 310, adsorption area; 400, lower shell; 410, air inlet; 422, second transverse rib; 424, third transverse rib; 426, fourth transverse rib; 430, oil return channel; 440, fourth baffle maze; 450, slot; 460, bolt hole; 500, sealing ring; 600, umbrella valve; 700, sealing strip; 800, cylinder head cover. DETAILED DESCRIPTION

[0028] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0031] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0032] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0034] When the engine is running, high-temperature, high-pressure combustible gases and mixed gases in the combustion chamber enter the crankcase through the gap between the piston ring pack and the cylinder block. Blow-by gases consist of unburned fuel, water vapor, and exhaust gases. Contact with the engine oil can dilute the oil, accelerating oil oxidation and deterioration. Water vapor condenses in the oil, forming sludge that blocks the oil flow. Acidic gases in the exhaust gas can enter the lubrication system, causing increased wear and corrosion of engine components. Blow-by gases can also cause excessive crankcase pressure, leading to seal failure and oil seepage.

[0035] Conventional crankshaft ventilation systems rely on an oil-gas separator to separate blowby gases. This allows the oil-gas mixture in the cylinder head cover or crankcase to enter the separator, either actively or passively. The filtered gases are then exhausted to the atmosphere or reburned, while the filtered oil is returned to the oil sump assembly. However, current emissions from oil-gas separators often fail to meet regulatory requirements and filtering effectiveness.

[0036] To address the low separation efficiency and poor separation effect of existing oil-gas separators, the present application provides an oil-gas separator integrated into a cylinder head cover. The oil-gas separator of the present application can serve as a pre-separation device, which can improve the oil-gas separation efficiency and the oil-gas separation effect during oil-gas separation.

[0037] Please refer to Figure 1, which shows an exploded view of the assembly of an oil-gas separator in one embodiment. The oil-gas separator, as shown in Figure 1, integrated into the cylinder head cover 800, includes a housing and a separation adsorption unit disposed within a cavity formed by the housing. The housing includes an upper housing 100 and a lower housing 400. The interior of the upper housing 100 includes several groups of baffle units, which are used to separate oil particles of a first diameter. The separation adsorption unit is connected to the upper housing 100 and is used to separate oil particles of a second diameter; wherein the first diameter is larger than the second diameter.

[0038] Please refer to Figure 1a and Figure 1b , or refer to Figure 1c and Figure 1d In some embodiments, the separation adsorption unit includes a separation plate 200 and an adsorption layer 300. Figure 1a or Figure 1d As shown, the separation plate 200 is connected to the upper shell 100, as shown in FIG. Figure 1b or Figure 1c As shown, the adsorption layer 300 is connected to the separation plate 200 .

[0039] like Figure 2 As shown in the example diagram of the upper shell 100, in some specific embodiments, the baffle unit in the upper shell 100 includes at least one of a baffle labyrinth or ribs. The oil-gas separator proposed in this embodiment separates a plurality of groups of baffle units in the upper shell 100 of the oil-gas separator. The baffle unit can be used for passive cyclone separation of the oil-gas mixture. When the oil-gas mixture such as unburned fuel gas, water vapor and exhaust gas enters the baffle unit, due to the different densities of the gas and oil droplet particles, the oil particles with larger diameters have greater inertia and directly collide with the baffle unit. The oil particles captured by the wall of the baffle unit are gathered and flow back to the oil pan through the umbrella valve 600 on the oil return channel 430, thereby achieving the separation of the oil particles of the first diameter.

[0040] In some exemplary embodiments, Figure 2Taking the structure of the upper housing 100 shown in FIG. as an example, when the baffle unit is a baffle maze, the upper housing 100 includes a plurality of baffle mazes. Figure 2 The upper housing 100 includes a first baffle labyrinth 112, a second baffle labyrinth 114, and a third baffle labyrinth 116, each arranged in a different manner. As shown in the figure, the first baffle labyrinth 112, the second baffle labyrinth 114, and the third baffle labyrinth 116 all have different shapes and conduction directions. The first baffle labyrinth 112 is T-shaped, the second baffle labyrinth 114 is V-shaped, and the third baffle labyrinth 116 is tree-branch shaped. The different baffle labyrinth arrangements provide for better filtering of oil droplets.

[0041] like Figure 3 As shown, the upper housing 100 further includes a first transverse rib 122, a separation plate mounting slot 130, an air outlet 140, and a sealing rib 150. The first transverse rib 122 is used to increase the strength of the upper housing 100. The air outlet 140 is used to discharge the oil-gas mixture after oil-gas separation, and the sealing rib 150 is used to seal the housing when installed with the lower housing 400.

[0042] The separator plate mounting grooves 130 are two symmetrical mounting grooves on the upper housing 100. The separator plate 200 is connected to the upper housing 100 through the separator plate mounting grooves 130. For example, the separator plate 200 can be fixedly connected to the upper housing 100 by inserting the separator plate 200 into the separator plate mounting grooves 130.

[0043] like Figure 3 The assembly exploded view of the separation adsorption unit shown in FIG. Figure 3 As shown in (a), the separation plate 200 has a plurality of evenly distributed separation holes 210, each of which is of the same size. The separation holes 210 are used to capture oil droplets of smaller diameter, such as those of the second size. The diameter of the separation holes 210 is calculated based on the oil-gas mixture to be separated to ensure optimal separation performance. The diameter of the separation holes 210 should be neither too small nor too large. If the diameter of the separation holes 210 is too large, the airflow cannot be accelerated. If the diameter of the separation holes 210 is too small, the airflow resistance will be excessively increased, hindering the passage of the oil-gas mixture.

[0044] like Figure 3 As shown, the separation plate 200 further includes an oil return port 220 , which is used to return the separated oil droplets to the oil pan through the oil return port 220 .

[0045] like Figure 3 As shown in (b), the adsorption layer 300 includes an adsorption area 310, which is located at the center of the adsorption layer 300 and is used to adsorb and filter the oil-gas mixture. Figure 3As shown in (c), connectors are provided around the adsorption region 310 , and the adsorption layer 300 is connected to the separation plate 200 via the connectors.

[0046] For example, Figure 3 As shown, the connecting member is a buckle 230 . Figure 3 (d) is a schematic diagram showing the adsorption layer 300 connected to the separation plate 200 via the buckle 230. It is understood that other connectors can be used to connect the separation plate 200 and the adsorption layer 300 in this embodiment, and are not limited to the buckle 230, as long as they can securely connect the separation plate 200 and the adsorption layer 300.

[0047] In some specific embodiments, such as Figure 3 As shown, the adsorption layer 300 is rectangular. The rectangular shape can more advantageously capture smaller oil particles. In some implementations, the adsorption layer 300 is made of a material with good adsorption effect, such as felt or sponge.

[0048] After the oil-gas separator of this embodiment separates the large-diameter oil droplets through the baffle unit, the smaller-diameter oil particles have a small inertia. When the air flow passes through the separation hole 210 of the hole separation plate 200, the flow rate of the oil-gas mixture is accelerated. The smaller oil particles are captured by the wall of the separation plate 200 after being accelerated. After gathering to a certain extent, they flow back to the oil pan through the umbrella valve 600 on the oil return channel, and the gas can be further filtered through the adsorption layer 300.

[0049] like Figure 4a and Figure 4b The lower housing 400 is shown in an exemplary diagram. In some embodiments, the lower housing 400 primarily serves to provide space for bolt installation and oil return arrangements. Specifically, the lower housing 400 includes an air inlet 410 for absorbing an initial oil-air mixture. To strengthen the lower housing 400, the lower housing 400 also includes a second transverse rib 422, a third transverse rib 424, a fourth transverse rib 426, and a fourth baffle labyrinth 440.

[0050] In some exemplary embodiments, an oil return channel 430 is provided on the lower housing 400. After the oil-air mixture is captured and gathered, it flows back to the oil pan through an umbrella valve 600 on the oil return channel 430. To allow the oil droplets to return to the oil pan more quickly, the return channel 430 is a vertical channel.

[0051] Please continue to refer to Figures 1 to Figure 5 In some specific embodiments, the oil-gas separator is integrated into the cylinder head cover 800 and includes an upper shell 100, a separation adsorption unit, and a lower shell 400. The separation adsorption unit is disposed inside the shell formed by the upper shell 100 and the lower shell 400 and includes a separation plate 200 and an adsorption layer 300.

[0052] Specifically, as shown in Figure 1, the upper shell 100 is provided with a separator plate mounting groove 130, allowing the separator plate 200 to be fixedly connected to the upper shell 100 via the separator plate mounting groove 130. The adsorption layer 300 is fixedly connected to the separator plate 200 via the clips 230 on the separator plate 200. Sealing ribs 150 are provided around the periphery of the upper shell 100, and slots 450 corresponding to the sealing ribs 150 are provided around the periphery of the lower shell 400. The upper shell 100 and the lower shell 400 are connected by inserting the sealing ribs 150 into the sealing rib slots 450 of the lower shell 400. To ensure the sealing of the interior of the shell, the connection is welded. The lower shell 400 is also equipped with a sealing ring 500, an umbrella valve 600, and a sealing strip 700. The sealing ring 500 is mounted on the lower shell 400, and the umbrella valve 600 and the sealing strip 700 are assembled on the lower shell 400. The oil-gas separator is fixed to the cylinder head cover 800 via the fixing bolt holes 460 on the lower housing 400. For example, six fixing bolt holes 460 may be provided on the lower housing 400.

[0053] Please refer to Figure 6 or Figure 7 The oil-gas separation principle diagram shows that the oil-gas mixture flows out from the cylinder head cover 800 and flows into the oil-gas separator proposed in this embodiment through the air inlet 410 on the lower shell 400. The oil-gas mixture first enters the baffle unit of the upper shell 100. Figure 2 As shown in FIG4 , the upper shell 100 includes several groups of baffle units with the same arrangement and structure, such as the first baffle maze 112, the second baffle maze 114, the third baffle maze 116 and the first transverse rib 122. After the oil-gas mixture enters the baffle unit, the passive cyclone separation process begins. Due to the difference in density of gas and oil particles in the oil-gas mixture, the oil particles with larger diameters have greater inertia and directly collide with the baffle maze and transverse ribs. The oil particles captured by the wall of the labyrinth baffle gather along the baffle and the inner wall of the shell and then flow back to the cylinder head through the oil return channel 430 in FIG4 , and finally flow back to the oil pan. The oil particles with smaller diameters have smaller inertia and enter the separation adsorption unit. After the oil-gas mixture enters the separation adsorption unit, it collides with the separation plate 200 and is captured by the adsorption layer 300. In the separation process, when the mixture flows through the separation hole 210 on the separation plate 200, the flow rate of the mixture is accelerated according to the principle of liquid pressure, and the oil particles with smaller diameters are accelerated. Figure 3 When the captured oil droplets gather to a certain extent, they are captured by the adsorption layer 300. Figure 3 The oil return port 220 in the separator 200 is collected in the oil return channel 430 on the lower housing 400. When the oil droplets in the oil return channel 430 accumulate to a certain level, the umbrella valve 600 in Figure 1 is pushed open, and the oil flows into the cylinder head and finally flows back to the oil pan.

[0054] In this embodiment, the oil-gas mixture separated by the passive cyclone separation and the impact separation of the separation plate 200 is separated from the Figure 2 The mixture outlet 140 flows to the outside of the engine.

[0055] This embodiment can effectively recover oil droplets of different sizes, improving the filtration efficiency and quality of the filtered oil. Integrating the oil-gas separator of this embodiment into the cylinder head cover 800 as a pre-separation device can greatly reduce the size and complexity of the oil-gas separator.

[0056] In the description of this specification, reference to the terms "some embodiments" or "other embodiments" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0057] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. An oil-gas separator, characterized in that: The oil-gas separator is integrated on the cylinder head cover and includes: a housing, the housing comprising an upper housing and a lower housing, the inner side of the upper housing comprising a plurality of baffle units, the baffle units being used to separate oil particles of a first diameter; A separation and adsorption unit is provided in the cavity formed by the shell, the separation and adsorption unit is connected to the upper shell, and is used to separate oil particles of a second diameter; wherein the first diameter is greater than the second diameter.

2. The oil-gas separator according to claim 1, characterized in that: The separation adsorption unit includes a separation plate and an adsorption layer. The separation plate is connected to the upper shell, and the adsorption layer is connected to the separation plate.

3. The oil-gas separator according to claim 2, characterized in that: The upper shell includes a separation plate mounting groove, and the separation plate is connected to the upper shell through the separation plate mounting groove.

4. The oil-gas separator according to claim 2, characterized in that: The separation plate includes a connecting piece, and the adsorption layer is connected to the separation plate via the connecting piece.

5. The oil-gas separator according to claim 2, characterized in that: The separation holes are evenly distributed on the separation plate, and the sizes of the separation holes are the same.

6. The oil-gas separator according to claim 2, characterized in that: The adsorption layer is rectangular.

7. The oil-gas separator according to claim 1, characterized in that: The baffle unit includes at least one of a baffle labyrinth or ribs.

8. The oil-gas separator according to claim 7, characterized in that: When the baffle unit is a baffle maze, the upper shell includes a plurality of baffle mazes, and the arrangement of the baffle mazes is different.

9. The oil-gas separator according to claim 1, characterized in that: The lower shell includes an air inlet for absorbing an initial oil-gas mixture; the upper shell includes an air outlet for discharging the separated oil-gas mixture.

10. The oil-gas separator according to claim 1, characterized in that: The lower housing includes an oil return passage.

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