Oil-gas separation device and engine

Abstract

The invention relates to an oil-gas separation device and an engine comprising the oil-gas separation device. The oil-gas separation device comprises a main body part, a separation part and a blocking part, the main body part comprises a side wall, a top wall and a bottom wall which define a separation cavity, an air outlet is formed in the top wall, and an air inlet is formed in the bottom wall; the separation part extends to the top wall from the part, close to the gas inlet, of the bottom wall, and a vent hole for accelerating an oil-gas mixture entering the separation cavity is formed in the separation part. The blocking part extends into the separation cavity from the part, close to the gas outlet, of the top wall and is separated from the bottom wall so as to impact the accelerated oil-gas mixture. And a labyrinth channel is formed between the air inlet and the air outlet. According to the oil-gas separation device, the good oil-gas separation effect can be achieved through a simple structure, the needed installation space is small, and the cost is low.

Description

Technical Field

[0001] The invention relates to the technical field of crankcase exhaust gas treatment, and in particular to an oil-gas separation device and an engine comprising the oil-gas separation device. Background Art

[0002] As is known to all, when an engine, such as a diesel engine, is working, a portion of the combustible mixture and the combustion exhaust gas will always pass through the opening of the piston ring into the crankcase to form crankcase exhaust gas (also known as "blow-by"). The crankcase exhaust gas will increase the pressure in the crankcase, increase the possibility of failure of the crankcase seal (such as oil seal failure), and thus may cause oil leakage. In order to balance the crankcase pressure, the engine is usually provided with a crankcase ventilation system, which connects the inside of the crankcase to the engine intake system or the atmosphere through a connecting pipe. However, the crankcase exhaust gas contains oil. If it is not treated and directly enters the intake system, it will cause the engine combustion process and emission performance to deteriorate, and the oil consumption will increase. Therefore, it is necessary to install an oil-gas separation device in the crankcase ventilation system to recover the oil in the crankcase exhaust gas, reduce oil consumption and reduce environmental pollution.

[0003] In the prior art, an external oil-gas separation device is usually used, which is connected to the crankcase outlet through a pipeline, and then a labyrinth structure or a filter element is used to achieve oil-gas separation. This oil-gas separation device has many parts, high cost, and requires sufficient space around the engine to arrange it. Patent document CN108049937A discloses a cylinder head cover built-in oil-gas separation system, which allows oil and gas to move forward through a perforated plate, continuously separates oil and gas, has a good separation effect, and avoids oil and gas discharge causing environmental pollution. However, the structure of the oil-gas separation system is still relatively complex, and it needs to cover the entire top space of the cylinder head cover. Summary of the invention

[0004] The object of the present invention is to solve at least one of the above problems and / or other problems existing in the prior art.

[0005] To achieve the above-mentioned object, an oil-gas separation device is provided according to one aspect of the present invention, and the oil-gas separation device includes a main body, a partition and a blocking part. The main body includes a side wall, a top wall and a bottom wall that surround a separation chamber, an air outlet is formed on the top wall, and an air inlet is formed on the bottom wall. The partition extends from a portion of the bottom wall close to the air inlet to the top wall, and an air vent is provided on the partition. The blocking part extends from a portion of the top wall close to the air outlet into the separation chamber and is spaced apart from the bottom wall. The partition and the blocking part are configured to form a labyrinth passage of an oil-gas mixture between the air inlet and the air outlet, the air vent is configured to accelerate the oil-gas mixture entering the separation chamber, and the blocking part is configured to impact the accelerated oil-gas mixture to promote oil-gas separation.

[0006] According to an embodiment of the present invention, the partition portion and the blocking portion are disposed in parallel with each other in the separation chamber along a vertical direction.

[0007] According to an embodiment of the present invention, only one vent hole is provided on the partition.

[0008] According to an embodiment of the present invention, the blocking portion is provided with a convex portion on a side facing the partition portion, and the convex portion is configured to increase a contact area between the oil-gas mixture and the blocking portion.

[0009] According to an embodiment of the present invention, the convex portion includes a plurality of convex strips which are arranged at equal intervals and are each in the shape of a long strip.

[0010] According to an embodiment of the present invention, each of the convex strips extends in a vertical direction and extends from a top end of the blocking portion connected to the top wall to a bottom end of the blocking portion.

[0011] According to an embodiment of the present invention, the bottom wall is arranged obliquely, and an oil outlet hole is arranged at the lowest point of the bottom wall.

[0012] According to an embodiment of the present invention, the oil-gas separation device further comprises a U-shaped tube disposed at the oil outlet, and the U-shaped tube is filled with a lubricating medium.

[0013] According to an embodiment of the present invention, the oil-gas separation device further includes a transition portion and a cover portion which are sequentially arranged on the top of the main body portion.

[0014] According to another aspect of the present invention, an engine is provided, the engine comprising a cylinder head cover and the oil-gas separation device as described above, wherein the cylinder head cover is provided with a vent, and the oil-gas separation device is detachably mounted at the vent.

[0015] The oil-gas separation device of the present invention can be directly installed at the vent of the cylinder head cover, and realizes oil-gas separation by accelerating and impacting the oil-gas mixture through the labyrinth-type channel inside the main body, the partition part and the blocking part. The oil-gas separation device can achieve a good oil-gas separation effect with a simple structure, and requires a small installation space and has a low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The features and advantages of the present invention will be clearly understood through the detailed description provided below with reference to the accompanying drawings. It should be understood that the following drawings are only schematic and not necessarily drawn to scale, and thus cannot be regarded as limiting the present invention, wherein:

[0017] Figure 1 A partial perspective view of an engine according to an exemplary embodiment of the present invention is shown.

[0018] Figure 2 A top view showing an assembly formed by a main body portion and a U-shaped pipe of the oil-gas separation device according to this exemplary embodiment.

[0019] Figure 3 Show Figure 2 The assembly is shown in cross-section along line AA.

[0020] Figure 4 Show Figure 2 The assembly is shown in cross-section along line BB.

[0021] Figure 5 A perspective view showing an oil-gas separation device according to this exemplary embodiment is shown.

[0022] Description of reference numerals:

[0023] 1. Main body; 11. Separation chamber; 12. Side wall; 13. Top wall; 14. Bottom wall; 141. Oil outlet; 15. Air outlet; 16. Air inlet; 2. Partition; 21. Air vent; 3. Blocking part; 31. Protrusion; 311. Protruding strip; 4. U-shaped tube; 5. Adapter; 6. Cover plate; 7. Cylinder head cover. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described below with reference to the accompanying drawings. In the following description, many specific details are set forth so that those skilled in the art can more fully understand and implement the present invention. However, it will be apparent to those skilled in the art that the present invention may be implemented without some of these specific details. In addition, it should be understood that the present invention is not limited to the specific embodiments described. On the contrary, any combination of the features and elements described below may be considered to implement the present invention, regardless of whether they relate to different embodiments. Therefore, the following aspects, features, embodiments and advantages are intended for illustration only and should not be considered as elements or limitations of the claims unless explicitly stated in the claims.

[0025] Hereinafter, the terms "comprising," "including," and "having" are used in an open-ended inclusive sense and mean that there may be additional elements / components other than the listed elements / components.

[0026] Figure 1 FIG. 2 shows a partial perspective view of an engine according to an embodiment of the present invention. Figure 1 As shown, the engine may include a cylinder head cover 7 and an oil-gas separation device. The cylinder head cover 7 may be disposed on the top of the cylinder head. The cylinder head cover 7 may cover and seal the cylinder head, keeping the engine oil (lubricating medium) inside the cylinder body, while isolating pollutants such as dirt and moisture from the outside of the cylinder body. The oil mist formed during the operation of the engine will gather on the cooler inner surface of the cylinder head cover, and after condensation, it will flow downward back to the oil tank. In addition, when the piston moves in the cylinder body, pressure will accumulate inside the engine, and this pressure will cause the various seals to leak, resulting in reduced engine efficiency. In order to avoid this situation, the cylinder head cover 7 may also be provided with a vent (not shown).

[0027] By detachably mounting the oil-gas separation device at the vent, it is possible to prevent the oil-gas mixture inside the engine from carrying a large amount of oil into the atmosphere during the ventilation process. As an example, the oil-gas separation device may be provided with a plurality of holes at intervals along its circumference, and bolts may be passed through the holes and threadedly connected to the cylinder head cover 7 for fixing. In addition, corresponding mounting features may be provided at the bottom of the oil-gas separation device and the top of the cylinder head cover 7, respectively, and the oil-gas separation device and the cylinder head cover 7 may be detachably connected by means of interference fit or other means through these mounting features.

[0028] Figures 2 to 5 FIG. 2 shows the oil-gas separation device in this embodiment. Figures 2 to 4 As shown, the oil-gas separation device according to this embodiment mainly includes a main body 1 , a partition 2 and a blocking part 3 .

[0029] The main body 1 may include a side wall 12, a top wall 13 and a bottom wall 14 that surround and form a separation chamber 11. An air outlet 15 is formed on the top wall 13. Since the oil-gas separation process has been carried out by the oil-gas separation device, the air outlet 15 can be directly exposed to the atmosphere for exhaust treatment, but it is preferably connected to the intake manifold of the engine through a connecting component. An air inlet 16 is formed on the bottom wall 14. When the oil-gas separation device is installed on the cylinder head cover 7, the air inlet 16 is connected to the vent on the cylinder head cover 7, so that the oil-gas mixture at the vent is introduced into the separation chamber 11.

[0030] The partition 2 is formed from a portion of the bottom wall 14 near the air inlet 16 (eg Figure 3 The partition 2 is provided with a vent hole 21. The vent hole 21 is configured to accelerate the oil-gas mixture entering the separation chamber 11. Providing only one vent hole 21 can enhance the acceleration effect. In another embodiment, the partition 2 can also be provided with multiple vent holes.

[0031] The blocking portion 3 is formed from a portion of the top wall 13 close to the air outlet 15 (eg Figure 3 The blocking portion 3 extends to the separation chamber 11 and is spaced apart from the bottom wall 14. The blocking portion 3 is configured to impact the accelerated oil-gas mixture to promote oil-gas separation. Accordingly, the blocking portion 3 extends to a position at a certain distance below the vent 21, so that the oil-gas mixture entering the separation chamber 11 through the vent 21 can impact the blocking portion 3.

[0032] In the above embodiment, the air inlet 16 is arranged opposite to a part of the top wall 13, the air outlet 15 is arranged opposite to a part of the bottom wall 14, and the partition 2 and the blocking portion 3 are configured so that a labyrinth passage of the oil-gas mixture is formed between the air inlet 16 and the air outlet 15. The oil-gas mixture is accelerated when passing through the vent hole 21 on the partition 2, and the accelerated oil-gas mixture then hits the blocking portion 3, and the separated oil droplets directly drip onto the bottom wall 14 to be collected and recycled.

[0033] Continue to refer Figure 3 In this embodiment, the partition 2 and the blocking portion 3 are arranged in parallel with each other in the vertical direction in the separation chamber 11. Therefore, the oil-gas mixture vertically hits the partition 2 after passing through the vent 21, and is separated more fully. In some other embodiments, the partition 2 and the blocking portion 3 may extend in a non-vertical direction, such as extending in an inclined manner and parallel to each other, or extending in an inclined manner and non-parallel to each other, as long as it can ensure that the oil-gas mixture flowing through the vent 21 hits the blocking portion 3.

[0034] In order to increase the contact area between the oil-gas mixture passing through the vent hole 21 and the blocking part 3, a convex portion 31 is provided on the blocking part 3. The convex portion 31 protrudes from the side surface of the blocking part 3 facing the partition 2 toward the partition 2, thereby increasing the surface area of ​​the impact point of the oil-gas mixture.

[0035] Preferably, the convex portion 31 may include a plurality of convex strips 311 arranged at equal intervals and each in the shape of a long strip. The plurality of convex strips 311 may be formed on a surface of the barrier portion 3 facing the partition portion 2 (eg, Figure 3 The right side surface of the blocking portion 3 shown in the figure) extends in any direction of the surface, mainly to increase the surface area of ​​the surface through the uneven features. In some other embodiments, the convex portion 31 may also include a plurality of convex points arranged at intervals, such as round convex points, needle-shaped convex points or cone-shaped convex points.

[0036] In the above embodiment, the vent hole 21 is arranged in the middle of the partition 2 in the left-right direction. Figure 4 As shown, a plurality of convex strips 311 are arranged at equal intervals in the middle of the blocking portion 3. Preferably, each convex strip 311 extends in the vertical direction, and each convex strip 311 extends from the top end of the blocking portion 3 connected to the top wall 13 to the bottom end of the blocking portion 3. This allows the separated oil droplets in the oil-gas mixture to be easily directed to the bottom wall 14.

[0037] like Figure 4 As shown, the bottom wall 14 is inclined, and an oil outlet 141 is provided at the lowest point of the bottom wall 14. Therefore, when the oil-gas separation device is connected to the cylinder head cover 7, the separated oil droplets can flow to the oil outlet 141 along the inclined bottom wall under the action of gravity.

[0038] like Figure 4 and Figure 5 As shown, the oil-gas separation device in this embodiment also includes a U-shaped tube 4 arranged at the oil outlet 141. The U-shaped tube 4 first extends downward from the bottom wall 14, then bends and extends upward. When the oil-gas separation device is arranged in the vertical direction, the lubricating medium filled in the U-shaped tube 4 is always in the bending section of the U-shaped tube 4, preventing the unseparated oil-gas mixture from entering the separation chamber 11. It can be understood that the lubricating medium in the U-shaped tube 4 can be consistent with the lubricating medium in the lubricating system of the crankcase, so that after overflowing the U-shaped tube 4 and flowing into the cylinder head cover 7, it can enter the lubricating system of the crankcase again for reuse.

[0039] like Figure 5 As shown, the oil-gas separation device in this embodiment further includes a transition portion 5 and a cover portion 6 which are sequentially arranged on the top of the main body 1. The transition portion 5 is surrounded by two ends ( Figure 5An open adapter cavity is provided at the upper and lower ends along its axial direction as shown, and the adapter cavity is connected to the air outlet 15 through the opening at the lower end. An air outlet pipe connected to the adapter cavity is also formed on the side of the adapter 5, and the separated gas enters the air outlet pipe through the air outlet 15 and the adapter cavity in sequence. The oil-gas separation device can be connected to the intake manifold of the engine through the air outlet pipe, so that the separated gas can be reused. The cover plate portion 6 is covered at the upper end opening of the adapter portion 5 and is sealed by a sealing ring, thereby sealing the entire adapter cavity. As an example, bolts can pass through the through holes provided on the cover plate portion 6, the adapter portion 5 and the main body 1 in sequence to fix the entire oil-gas separation device at the vent of the cylinder head cover 7.

[0040] The present invention also provides an engine comprising the oil-gas separation device.

[0041] Industrial Applicability

[0042] The oil-gas separation device according to the present invention is particularly suitable for crankcase ventilation systems of engineering machinery with diesel engines. However, it should be understood that the oil-gas separation device according to the present invention can also be used in other equipment that requires oil-gas separation, such as motor vehicles with gasoline engines or diesel engines.

[0043] by Figures 1 to 5 Taking the illustrated embodiment as an example, when assembling the oil-gas separation device, first install the U-shaped tube 4 at the oil outlet hole 141 of the bottom wall 14 of the main body 1. Then, insert the main body 1 with the U-shaped tube 4 into the cylinder head cover 7 in the vertical direction, so that the installation features of the oil-gas separation device and the cylinder head cover 7 are placed correspondingly. Then place the adapter 5 on the top of the main body 1, so that the opening at the lower end of the adapter 5 is aligned with the outlet 15. The outlet pipe of the adapter 5 faces the side that is convenient for connecting to the atmosphere or the engine intake manifold. Then, place the sealing ring and the cover plate 6 at the opening at the upper end of the adapter 5 in sequence. After the holes for installation of the cover plate 6, the adapter 5 and the main body 1 are aligned with each other, the bolts are passed through the holes of each component in sequence and threadedly connected with the cylinder head cover 7, thereby completing the installation of the oil-gas separation device and the cylinder head cover 7.

[0044] Combine the following Figures 1 to 5 The embodiment shown briefly illustrates the working process of the oil-gas separation device according to the present invention. The oil-gas mixture (exhaust gas) from the engine crankcase flows to the cylinder head cover 7 through the ventilation port and the intake port 16. Figure 3In the flow channel on the right side of the main body 1 shown. The oil-gas mixture in the flow channel can only flow further through the vent 21 located on the partition 2. The oil-gas mixture is accelerated when passing through the vent 21 with a smaller diameter, and then hits the blocking portion 3, so that the mist-like oil mist dispersed in the oil-gas mixture is aggregated into larger oil droplets on the side surface of the blocking portion 3 facing the vent 21 and separated from the oil-gas mixture. The separated oil droplets flow to the bottom wall 14 under the guidance of the convex strip 311. The inclined bottom wall 14 gathers the oil droplets falling on the bottom wall 14 into oil liquid and guides them to the oil outlet 141 set at the lowest point of the bottom wall 14. The U-tube 4 at the oil outlet 141 is filled with a lubricating medium, and the separated oil droplets return to the lubrication system of the crankcase through the oil circuit inside the U-tube 4 and the cylinder head cover 7. On the other hand, the gas after the oil is separated flows downward on the right side of the barrier 3, turns through the gap between the barrier 3 and the bottom wall 14, and then flows upward along the flow channel on the left side of the barrier 3 to the gas outlet 15. The direction of the gas outlet 15 is toward Figure 3 As shown above, the gas after oil separation can be directly discharged into the atmosphere through the gas outlet 15 (if it has reached the emission standard). If it is necessary to introduce the oil-gas mixture into the engine intake manifold for reuse, or if it is necessary to purify the oil-gas mixture that does not reach the emission standard before discharge, it can be discharged at Figure 5 The top of the main body 1 shown is provided with a transition portion 5 and a cover plate portion 6 to seal the air outlet 15 and guide the oil-gas mixture into the intake manifold of the engine or into the purification device through the air outlet pipe.

[0045] The oil-gas separation device of the present invention is an independent integrated oil-gas separation device, which integrates collision separation and labyrinth channels to achieve oil-gas separation, and has low gas resistance. In addition, the oil-gas separation device is small in size and can be directly installed at the vent of the cylinder head cover 7 in a detachable installation manner, without the need for additional pipes, so it has the advantages of small space occupation and low cost.

[0046] For those skilled in the art, various modifications and variations may be made to the embodiments disclosed above without departing from the scope or spirit of the present invention. Other embodiments of the present invention will be apparent to those skilled in the art from the practice of the present invention disclosed in this specification. This specification and the examples disclosed therein should be considered to be illustrative only, and the true scope of the present invention is specified by the appended claims and their equivalents.

Claims

1. An oil-gas separation device, characterized in that: include: A main body (1), the main body (1) comprising a side wall (12), a top wall (13) and a bottom wall (14) which surround and form a separation chamber (11), an air outlet (15) being formed on the top wall (13), and an air inlet (16) being formed on the bottom wall (14); A partition (2), the partition (2) extending from a portion of the bottom wall (14) close to the air inlet (16) to the top wall (13), and a vent hole (21) is provided on the partition (2); as well as a blocking portion (3), the blocking portion (3) extending from a portion of the top wall (13) close to the gas outlet (15) into the separation chamber (11) and being spaced apart from the bottom wall (14); The partition (2) and the blocking portion (3) are configured to form a labyrinth passage for the oil-gas mixture between the air inlet (16) and the air outlet (15), the air vent (21) is configured to accelerate the oil-gas mixture entering the separation chamber (11), and the blocking portion (3) is configured to impact the accelerated oil-gas mixture to promote oil-gas separation.

2. The oil-gas separation device according to claim 1, characterized in that: The partition portion (2) and the blocking portion (3) are arranged in parallel with each other in the separation chamber (11) along a vertical direction.

3. The oil-gas separation device according to claim 1, characterized in that: The partition (2) is provided with only one vent hole (21).

4. The oil-gas separation device according to claim 1, characterized in that: The blocking portion (3) is provided with a convex portion (31) on a side facing the partition portion (2), and the convex portion (31) is configured to increase a contact area between the oil-gas mixture and the blocking portion (3).

5. The oil-gas separation device according to claim 4, characterized in that: The convex portion (31) comprises a plurality of convex strips (311) which are arranged at equal intervals and are each in the shape of an elongated strip.

6. The oil-gas separation device according to claim 5, characterized in that: Each of the convex strips (311) extends in a vertical direction and extends from a top end of the blocking portion (3) connected to the top wall (13) to a bottom end of the blocking portion (3).

7. The oil-gas separation device according to any one of claims 1 to 6, characterized in that: The bottom wall (14) is arranged obliquely, and an oil outlet hole (141) is arranged at the lowest point of the bottom wall (14).

8. The oil-gas separation device according to claim 7, characterized in that: The oil-gas separation device further comprises a U-shaped tube (4) arranged at the oil outlet hole (141), and the U-shaped tube (4) is filled with a lubricating medium.

9. The oil-gas separation device according to any one of claims 1 to 6, characterized in that: The oil-gas separation device further comprises a transition portion (5) and a cover plate portion (6) which are sequentially arranged on the top of the main body portion (1).

10. An engine, characterized in that: The engine comprises a cylinder head cover (7) and an oil-gas separation device according to any one of claims 1 to 9, wherein the cylinder head cover (7) is provided with a vent, and the oil-gas separation device is detachably mounted at the vent.

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