Integrated oil-gas separation system for engine and use method of integrated oil-gas separation system

Abstract

The invention discloses an integrated oil-gas separation system for an engine and a using method of the integrated oil-gas separation system, and belongs to the technical field of engines. The integrated oil-gas separation system comprises an engine body, a plurality of waste gas outlets are formed in the top of the engine body, and an intercooler support is installed on the upper portions of the waste gas outlets to form an intercooler support cavity with the top of the engine body; the waste gas outlet is communicated with an intercooler support cavity, a respirator cavity is formed in the side portion of the intercooler support, a plurality of first pipelines are installed at the other end of the respirator cavity, the other ends of the first pipelines are connected with an oil-gas separation cavity integrated on a gas inlet pipe of a gas compressor, and a plurality of oil-gas separators are arranged in the oil-gas separation cavity. And gas inlets of the oil-gas separators communicate with the oil-gas separation cavity, and gas outlets of the multiple oil-gas separators communicate with the gas compressor gas inlet pipe. By means of the intercooler support and the gas compressor gas inlet pipe which are integrally arranged, waste gas is effectively filtered in a combined mode of pre-filtering and fine filtering, so that the engine structure is more compact, and meanwhile efficient oil-gas separation is achieved.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and more specifically to an integrated oil-gas separation system for engines and its usage method. Background Technology

[0002] With increasingly stringent emission regulations for non-road diesel engines and the continuous pursuit of low oil consumption performance, the adoption of closed-loop breathing systems has become the mainstream technical direction. In this system, the exhaust gas generated in the engine crankcase needs to be fully separated by an oil-gas separator. The separated lubricating oil is then returned to the oil pan, while the purified gas is reintroduced into the turbocharger compressor inlet to participate in combustion.

[0003] In existing technologies, the commonly used integrated external oil-gas separator design involves the oil-gas separator being a separate component connected to the engine crankcase, oil pan, and compressor inlet via a complex external piping network. This discrete layout presents certain problems: First, the external separator and complex piping lead to an increase in the number of parts, which not only increases the overall weight and volume of the engine, making it difficult to achieve compact and lightweight engine design, but also increases the difficulty of layout in the whole vehicle or the whole machine. In addition, the numerous connection points and pipes also mean an increase in potential leakage points, reducing system reliability, and causing inconvenience to the assembly and subsequent maintenance of the whole machine. Furthermore, existing technologies lack pretreatment methods for oil-air mixtures. High oil mist concentrations in exhaust gas directly impact the oil-air separator filter element, increasing its workload. This not only shortens the separator's service life but also easily exceeds its processing capacity when the engine reaches its maximum oil carrying capacity under special operating conditions, leading to separation failure. As a result, a large amount of engine oil is carried into the intake system, causing a decline in engine performance or even malfunction. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides an integrated oil-gas separation system for engines and its usage method. By integrating the intercooler bracket and compressor intake pipe, it effectively combines pre-filtration and fine filtration of exhaust gas, making the engine structure more compact while achieving efficient oil-gas separation.

[0005] The technical solution of the present invention is as follows: In a first aspect of the invention, an integrated oil-gas separation system for an engine is provided, comprising an engine block, a plurality of exhaust gas outlets on the top of the engine block, an intercooler bracket mounted on the upper part of the plurality of exhaust gas outlets, one end of the intercooler bracket near the exhaust gas outlets being configured as a cavity structure, the intercooler bracket and the top of the engine block forming an intercooler bracket cavity, the plurality of exhaust gas outlets communicating with the intercooler bracket cavity, a breather cavity provided on the side of the intercooler bracket, the breather cavity communicating with the intercooler bracket cavity, the other end of the breather cavity being connected to an oil-gas separation cavity via a pipeline, the oil-gas separation cavity being integrated into the compressor intake pipe, a plurality of oil-gas separators being provided within the oil-gas separation cavity, the inlets of the plurality of oil-gas separators communicating with the oil-gas separation cavity, and the outlets of the plurality of oil-gas separators communicating with the compressor intake pipe. In some embodiments of the present invention, a first mounting surface is provided at the mounting location between the top of the body and the intercooler bracket, and a second mounting surface is provided at the mounting location between the intercooler bracket and the top of the body, and a sealing structure is provided between the first mounting surface and the second mounting surface. In some embodiments of the present invention, a plurality of first mounting holes are provided on the second mounting surface. The plurality of first mounting holes are disposed in the cavity wall of the intercooler bracket cavity. A first connecting bolt is provided in the first mounting hole. The first connecting bolt passes through the top of the intercooler bracket and is connected to the top of the engine block. In some embodiments of the present invention, the top of the intercooler bracket is provided with a third mounting surface, the third mounting surface is provided with a plurality of second mounting holes, the second mounting holes are provided with second connecting bolts, the third mounting surface is connected to the intercooler through the second connecting bolts, the mounting area of ​​the third mounting surface is larger than the mounting area of ​​the first mounting surface, and the mounting area of ​​the third mounting surface is larger than the mounting area of ​​the second mounting surface. In some embodiments of the present invention, the outer wall of the intercooler bracket is provided with a plurality of external reinforcing ribs, and the inner wall of the intercooler bracket cavity is provided with a plurality of internal reinforcing ribs. In some embodiments of the present invention, the oil-gas separation chamber is configured as: after the oil-gas separator and the compressor inlet pipe are installed, the chamber formed by the outside of the filter element structure in the oil-gas separator and the wall of the compressor inlet pipe; The gas flow area inside the respirator cavity is smaller than the gas flow area inside the intercooler support cavity, and the gas flow area inside the oil-gas separation cavity is smaller than the gas flow area inside the respirator cavity. In some embodiments of the present invention, one end of the compressor inlet pipe is provided with a first inlet, the first inlet is connected to an air filter, and a compressor inlet cavity is provided near the first inlet, the compressor inlet cavity being in communication with the first inlet. The side of the compressor inlet pipe is provided with several second inlets, and the several second inlets are respectively connected to the outlets of several oil-gas separators through pipelines. The side of the compressor inlet pipe is also provided with several first outlets, which are respectively connected to the compressor inlet. In some embodiments of the present invention, the bottom of the compressor inlet pipe is provided with an oil collecting cavity. The oil collecting cavity is configured as follows: after the oil-gas separator is installed with the compressor inlet pipe, the bottom of the filter element structure in the oil-gas separator and the wall of the compressor inlet pipe form a cavity. The oil collecting cavity is provided with an oil outlet, the oil outlet is connected to a return oil pipeline, and a one-way valve is provided on the return oil pipeline. In some embodiments of the present invention, the respirator cavity is provided with a bypass valve mounting port, which is used to install a bypass valve. In a second aspect of the invention, a method of using an integrated oil-gas separation system for an engine is provided, comprising: The exhaust gas in the crankcase is discharged from the exhaust outlet at the top of the engine block and enters the intercooler bracket cavity formed by the intercooler bracket and the top of the engine block for primary pre-filtration. The exhaust gas then flows into the breather cavity with a reduced gas flow area for secondary pre-filtration. The exhaust gas changes direction multiple times between the cavities, increasing the condensation of oil and gas into oil droplets and backflow, thus achieving multi-stage pre-filtration. The exhaust gas after secondary pre-filtration enters the oil-gas separation chamber integrated on the compressor inlet pipe through the first pipeline, and further flows into the oil-gas separator in the oil-gas separation chamber for fine filtration. The separated clean gas flows into the compressor inlet pipe through the oil-gas separator outlet and flows to the compressor. The separated oil is collected by gravity into the oil collection chamber at the bottom of the compressor intake pipe, and then returned to the oil pan through the return oil line with a one-way valve.

[0006] One or more technical solutions of the present invention have the following beneficial effects: By designing the intercooler bracket with a cavity structure, sealing it with the top of the engine block to form the intercooler bracket cavity, the pre-filtration function is successfully integrated into the V-angle of the engine. At the same time, the oil-gas separation chamber and multiple oil-gas separators are directly integrated into the compressor intake pipe, replacing the traditional independent external separators. This fundamentally solves the problems of many parts and complex piping in external solutions, greatly improving the compactness and lightweight level of the engine structure, and reducing assembly steps and potential leakage points.

[0007] By setting up exhaust gas flow paths with progressively decreasing flow areas, the intercooler support cavity, acting as an expansion space, facilitates oil and gas condensation and reflux. When exhaust gas flows from the wide intercooler support cavity into the narrow breather cavity, the flow velocity increases, which helps oil droplets impact the wall under inertia and achieve separation. Similarly, subsequent entry into the oil-gas separation cavity through pipelines achieves secondary direction change and reduced flow area, effectively solving the problem of insufficient pre-filtration capacity and achieving three-stage effective pre-filtration of exhaust gas. This significantly reduces the concentration of oil mist entering the oil-gas separator, not only improving the separation efficiency of the entire system but also greatly reducing the workload of the oil-gas separator, extending its service life, and avoiding failures caused by excessive oil carrying capacity under special operating conditions. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the overall structure of an integrated oil-gas separation system for an engine provided in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the structure of the first mounting surface provided in Embodiment 1 of the present invention; Figure 3 This is a front view schematic diagram of the intercooler bracket provided in Embodiment 1 of the present invention; Figure 4 This is a bottom view of the intercooler bracket provided in Embodiment 1 of the present invention; Figure 5 This is a top view of the intercooler bracket provided in Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the compressor inlet pipe provided in Embodiment 1 of the present invention. Figure 1 ; Figure 7 This is a schematic diagram of the compressor inlet pipe provided in Embodiment 1 of the present invention. Figure 1 two.

[0009] In the picture: 1. Engine block; 101. First mounting surface; 102. Exhaust outlet; 2. Intercooler bracket; 201. Second mounting surface; 202. First mounting hole; 203. Third mounting surface; 204. Second mounting hole; 205. External reinforcing rib; 206. Internal reinforcing rib; 207. Intercooler bracket cavity; 208. Top reinforcing rib; 3. Sealed structure; 4. Breathing apparatus chamber; 401. Bypass valve mounting port; 402. Breathing apparatus chamber outlet; 5. Compressor inlet pipe; 501. First inlet; 502. Compressor inlet chamber; 503. Second inlet; 504. First outlet; 505. Oil collection chamber; 506. Oil outlet; 507. Oil return line; 508. Check valve; 509. Oil-gas separator chamber; 510. Oil-gas separator chamber inlet; 6. Oil-gas separator. Detailed Implementation

[0010] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0011] Example 1 In a typical embodiment of the present invention, such as Figures 1 to 7 As shown, an integrated oil-gas separation system for an engine is proposed, including an engine block 1. The top of the engine block 1 has several exhaust gas outlets 102. An intercooler bracket 2 is installed on the upper part of the exhaust gas outlets 102. The end of the intercooler bracket 2 near the exhaust gas outlets 102 is configured as a cavity structure. The intercooler bracket 2 and the top of the engine block 1 are installed to form an intercooler bracket cavity 207. A sealing structure 3 is provided at the installation position to ensure the sealing of the cavity. The several exhaust gas outlets 102 and the intercooler bracket... The intercooler bracket 2 is connected to the intercooler bracket 207. The side of the intercooler bracket 2 is provided with a breather cavity 4. The breather cavity 4 is connected to the intercooler bracket cavity 207. The other end of the breather cavity 4 is connected to an oil-gas separation cavity 509 through a pipeline. The oil-gas separation cavity 509 is integrated on the compressor inlet pipe 5. The oil-gas separation cavity 509 is provided with several oil-gas separators 6. The inlets of several oil-gas separators 6 are connected to the oil-gas separation cavity 509, and the outlets of several oil-gas separators 6 are connected to the compressor inlet pipe 5. The bottom of the intercooler bracket 2 is configured as a cavity structure, which together with the top of the engine block 1 forms the intercooler bracket cavity 207, directly collecting crankcase exhaust gas from the exhaust gas outlet 102 at the top of the engine block 1. The exhaust gas then flows through the breather cavity 4 connected to it, and is guided through the first pipeline to the oil-gas separation cavity 509 integrated on the compressor intake pipe 5, and is finally purified by the oil-gas separator 6 in the cavity.

[0012] The crankcase exhaust outlet 102 is configured with 6 outlets, which are respectively located in the left cylinder, the right cylinder and below the V-shaped angle at the top of the engine block 1. The 6 exhaust outlets 102 can ensure stable exhaust flow while increasing exhaust flow velocity and improving exhaust pre-filtration function.

[0013] By eliminating the traditional independent external separator and its complex external piping, the pre-filtration and fine filtration functions are integrated into the intercooler bracket 2 and the compressor intake pipe 5, two engine body components, respectively. This significantly reduces the total number of system parts, lowers the overall weight and space occupied by the engine, and makes it easier to arrange on the whole machine.

[0014] By eliminating numerous external connection points and lengthy pipelines, the risk of oil and gas leaks caused by loose joints and aging pipelines is reduced at the source, making the entire closed breathing system more sealed and stable in operation.

[0015] After the exhaust gas exits the crankcase, it first enters the relatively large intercooler support cavity 207, where airflow expansion and initial oil droplet condensation are achieved, completing the first pre-filtration. This reduces the burden on subsequent fine separation, thereby helping to improve the separation efficiency of the entire system and the service life of the oil-gas separator 6.

[0016] And such Figure 1 As shown, the respirator cavity 4 is located on the side of the intercooler support cavity 207, and the connection path between the two is set at a certain angle. In this embodiment, the flow path between the two is set at a right angle. When the crankcase exhaust gas flows from the intercooler support cavity 207 to the respirator cavity 4, it undergoes the first vertical change of direction. The exhaust gas will collide between the two cavities and channels, thereby causing the oil-air gel to adhere to the cavity wall, achieving pre-filtration.

[0017] Furthermore, such as Figure 1 , Figure 3 and Figure 5 As shown, the top of the respirator cavity 4 is provided with two respirator cavity outlets 402. The two respirator cavity outlets 402 are vertically arranged and connected to two pipelines respectively. The two pipelines are connected to the oil-gas separation cavity 509 integrated on the compressor inlet pipe 5. The exhaust gas achieves a second reversible transport between the respirator cavity 4 and the pipeline, and the flow area is reduced, which further improves the oil-gas pre-filtration capability.

[0018] A first mounting surface 101 is provided at the mounting point between the top of the machine body and the intercooler bracket 2, and a second mounting surface 201 is provided at the mounting point between the intercooler bracket 2 and the top of the machine body. A sealing structure 3 is provided between the first mounting surface 101 and the second mounting surface 201. This design ensures that the intercooler bracket cavity 207, formed by the intercooler bracket 2 and the top of the engine block 1, has good sealing performance. This effectively prevents crankcase exhaust gas from leaking from the connection point during the pre-filtration stage, ensuring directional flow of exhaust gas and avoiding oil contamination and engine performance degradation caused by leakage. Simultaneously, it ensures a stable pre-filtration pressure field within the intercooler bracket cavity 207, thus guaranteeing the reliability of the pre-filtration effect. The sealing structure 3 can be set as an O-ring seal.

[0019] A plurality of first mounting holes 202 are provided on a plurality of second mounting surfaces 201. The plurality of first mounting holes 202 are located in the cavity wall of the intercooler bracket cavity 207. A first connecting bolt is provided in the first mounting hole 202. The first connecting bolt passes through the top of the intercooler bracket 2 and is connected to the top of the machine body.

[0020] like Figure 5 As shown, the first connecting bolt is embedded in the cavity wall. Firstly, this optimizes the structural space, preventing the connecting components from occupying additional external space and further enhancing the system's compactness. Secondly, it strengthens the connection rigidity and the uniformity of the sealing surface compression, thereby improving the overall structural strength and sealing reliability of the connection between the intercooler bracket 2 and the engine block, making it less prone to loosening under engine vibration conditions. Furthermore, the intercooler bracket 2 is connected in two parts: the lower part connects to the engine block 1, while the upper part supports the intercooler.

[0021] The top of the intercooler bracket 2 is provided with a third mounting surface 203, and a plurality of second mounting holes 204 are provided on the third mounting surface 203. Second connecting bolts are provided in the second mounting holes 204. The third mounting surface 203 is connected to the intercooler through the second connecting bolts. The mounting area of ​​the third mounting surface 203 is larger than the mounting area of ​​the first mounting surface 101 and the mounting area of ​​the third mounting surface 203 is larger than the mounting area of ​​the second mounting surface 201.

[0022] The larger mounting area of ​​the third mounting surface 203 provides a more stable support foundation for the intercooler, ensuring its installation stability under vibration. Simultaneously, the intercooler's fixing function and the pre-filtration function of the breathing system are cleverly integrated into the same intercooler bracket 2 component, achieving a high degree of functional integration. This avoids the need for two separate components for supporting the intercooler and constructing the pre-filtration chamber, simplifying the structure and reducing manufacturing costs.

[0023] The outer wall of the intercooler bracket 2 is provided with several external reinforcing ribs 205, and the inner wall of the intercooler bracket cavity 207 is provided with several internal reinforcing ribs 206. like Figure 4 , Figure 5As shown, by providing external reinforcing ribs 205 and internal reinforcing ribs 206 on the outer and inner walls of the intercooler bracket 2 respectively, the structural strength and durability of the integrated component are directly improved. As a multifunctional component that simultaneously supports the intercooler, forms the pre-filtration chamber, and withstands engine vibration loads, the intercooler bracket 2 requires high structural rigidity. The reinforcing ribs effectively prevent deformation or cracking due to stress during long-term use, ensuring the stability of the shape and volume of the intercooler bracket chamber 207 and the breather chamber 4, thereby guaranteeing the long-term reliability of the pre-filtration performance. Furthermore, the internal reinforcing ribs additionally increase the surface area for oil and gas impact, promoting condensation and separation, and facilitating oil and gas condensation. In addition, the upper part of the intercooler bracket 2 is also equipped with a top reinforcing rib 208, providing structural strength.

[0024] The oil-gas separation chamber 509 is configured as follows: after the oil-gas separator 6 and the compressor inlet pipe 5 are installed, the chamber formed by the outside of the filter element structure in the oil-gas separator 6 and the wall of the compressor inlet pipe 5; The gas flow area inside the respirator cavity 4 is smaller than the gas flow area inside the intercooler support cavity 207, and the gas flow area inside the oil-gas separation cavity 509 is smaller than the gas flow area inside the respirator cavity 4. The breather cavity 4 is smaller than the intercooler support cavity 207, and the oil-gas separation cavity 509 is smaller than the breather cavity 4. This progressively decreasing flow area improves pre-filtration efficiency. First, the intercooler support cavity 207, as an expansion space, facilitates oil-gas condensation and reflux. When exhaust gas flows from the wide intercooler support cavity 207 into the narrow breather cavity 4, the flow velocity increases, which helps oil droplets impact the wall under inertia and achieve separation. Similarly, the subsequent flow through the pipeline into the oil-gas separation cavity 509 achieves a secondary deflection and a reduced flow area, further enhancing pre-filtration.

[0025] The progressively decreasing flow area ensures that the exhaust gas can be pre-filtered uniformly, effectively, and progressively accelerated. This optimizes the exhaust gas flow path while employing three stages of pre-filtration: first-stage expansion filtration and condensation in the intercooler support cavity 207; second-stage accelerated filtration by reducing the flow area from the intercooler support cavity 207 to the breather cavity 4; and third-stage accelerated filtration by reducing the flow area from the breather cavity 4 to the oil-gas separation cavity 509 via pipeline. This significantly reduces the oil content in the exhaust gas entering the fine filtration unit. Furthermore, the exhaust gas flows tangentially into the oil-gas separation cavity 509, utilizing centrifugal force for separation and increasing the exhaust gas flow rate into the oil-gas separator 6. The accelerated exhaust gas then enters the oil-gas separator 6 for further separation, improving oil-gas separation efficiency. Through these design elements, the overall system separation efficiency is enhanced, and the service life of the oil-gas separator 6 is extended.

[0026] like Figure 6 and Figure 7As shown, one end of the compressor inlet pipe 5 is provided with a first air inlet 501, which is connected to the air filter. Near the first air inlet 501, there is a compressor inlet chamber 502, which is connected to the first air inlet 501. The side of the compressor inlet pipe 5 is provided with several second inlets 503, and the several second inlets 503 are respectively connected to the outlets of several oil-gas separators 6 through pipelines. The side of the compressor inlet pipe 5 is also provided with several first outlets 504, which are respectively connected to the compressor inlet.

[0027] The oil-gas separation chamber 509 is also provided with an oil-gas separation chamber inlet 510. The oil and gas in the respirator chamber 4 enter the oil-gas separation chamber 509 through the pipeline via the oil-gas separation chamber inlet 510.

[0028] The compressor intake pipe 5 simultaneously features a first intake port 501 to introduce fresh air, a second intake port 503 to introduce purified crankcase exhaust gas, and a first outlet 504 to deliver the mixed purified gas to the compressor, ultimately ensuring smooth compressor intake while achieving exhaust gas recirculation. By integrating the functions of multiple components such as the traditional compressor intake pipe 5, oil-gas separator 6 housing, and multi-channel gas mixing chamber into a single integrated unit, the structure of the engine's intake and breathing systems is simplified, reducing the number of parts and connection interfaces. This not only improves compactness but also enhances system sealing reliability and assembly convenience due to the reduced number of interfaces.

[0029] The bottom of the compressor inlet pipe 5 is provided with an oil collection chamber 505. The oil collection chamber 505 is configured as follows: after the oil-gas separator 6 is installed with the compressor inlet pipe 5, the bottom of the filter element structure in the oil-gas separator 6 and the wall of the compressor inlet pipe 5 form a cavity. The oil collection chamber 505 is provided with an oil outlet 506. The oil outlet 506 is connected to a return oil pipeline 507. A one-way valve 508 is provided on the return oil pipeline 507.

[0030] By integrating an oil collection chamber 505 at the bottom with the compressor intake pipe 5 and configuring a return oil line 507 with a one-way valve 508, efficient and reliable recovery of separated engine oil is achieved. The oil collection chamber 505 directly collects the engine oil separated from the upper oil-gas separator 6. It has a compact structure and a short path. The one-way valve 508 on the return oil line 507 effectively prevents backflow of oil gas or engine oil foam in the oil pan under pressure fluctuations through the return oil line 507, ensuring the one-wayness and stability of the oil-gas separation process, and greatly improving the system's operational reliability and separation efficiency.

[0031] The breather chamber 4 is equipped with a bypass valve mounting port 401, which is used to install a bypass valve. When the flow resistance of the rear oil-gas separator 6 is too high due to dirt blockage or icing, the internal pressure of the crankcase will rise abnormally. At this time, the bypass valve will automatically open, providing an emergency release channel for the high-pressure exhaust gas, thus avoiding serious malfunctions such as damage to oil seals and oil leakage in various parts of the engine caused by excessive crankcase pressure.

[0032] In a second aspect of the invention, a method of using an integrated oil-gas separation system for an engine is provided, comprising: The exhaust gas in the crankcase is discharged from the exhaust outlet 102 at the top of the engine block 1 and enters the intercooler bracket cavity 207 formed by the intercooler bracket 2 and the top of the engine block for primary pre-filtration. The exhaust gas then flows into the breather cavity 4 with a reduced gas flow area for secondary pre-filtration. After secondary pre-filtration, the exhaust gas enters the oil-gas separation chamber 509 integrated on the compressor inlet pipe 5 through the first pipeline. The exhaust gas flows tangentially into the oil-gas separation chamber 509 and is separated by centrifugal force, which increases the flow rate of the exhaust gas entering the oil-gas separator 6. The accelerated exhaust gas flows into the oil-gas separator 6 in the oil-gas separation chamber 509 for fine filtration. The separated clean gas flows into the compressor inlet pipe 5 through the outlet of the oil-gas separator 6 and flows to the compressor. The separated oil is collected by gravity into the oil collection chamber 505 at the bottom of the compressor intake pipe 5, and then returns to the oil pan through the return oil line 507 with a one-way valve 508.

[0033] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. An integrated oil-gas separation system for an engine, characterized in that, The system includes an engine block with several exhaust gas outlets on its top. An intercooler bracket is mounted on the upper part of each exhaust gas outlet. One end of the intercooler bracket near the exhaust gas outlets is a cavity structure. The intercooler bracket and the top of the engine block form an intercooler bracket cavity. The exhaust gas outlets are connected to the intercooler bracket cavity. A breather cavity is located on the side of the intercooler bracket and is connected to the intercooler bracket cavity. The other end of the breather cavity is connected to an oil-gas separation cavity via a pipe. The oil-gas separation cavity is integrated into the compressor intake pipe and contains several oil-gas separators. The inlets of the oil-gas separators are connected to the oil-gas separation cavity, and the outlets of the oil-gas separators are connected to the compressor intake pipe.

2. The integrated oil-gas separation system for an engine as described in claim 1, characterized in that, The top of the machine body and the mounting point of the intercooler bracket are provided with a first mounting surface, and the mounting point of the intercooler bracket and the top of the machine body are provided with a second mounting surface. A sealing structure is provided between the first mounting surface and the second mounting surface.

3. The integrated oil-gas separation system for an engine as described in claim 2, characterized in that, The second mounting surface is provided with a plurality of first mounting holes, which are disposed in the cavity wall of the intercooler bracket cavity. A first connecting bolt is provided in the first mounting hole, which passes through the top of the intercooler bracket and is connected to the top of the engine block.

4. An integrated oil-gas separation system for an engine as described in claim 2, characterized in that, The top of the intercooler bracket is provided with a third mounting surface, and the third mounting surface is provided with a plurality of second mounting holes. The second mounting holes are provided with second connecting bolts. The third mounting surface is connected to the intercooler through the second connecting bolts. The mounting area of ​​the third mounting surface is larger than the mounting area of ​​the first mounting surface, and the mounting area of ​​the third mounting surface is larger than the mounting area of ​​the second mounting surface.

5. An integrated oil-gas separation system for an engine as described in claim 1, characterized in that, The intercooler bracket has several external reinforcing ribs on its outer wall and several internal reinforcing ribs on its inner wall.

6. An integrated oil-gas separation system for an engine as described in claim 1, characterized in that, The oil-gas separation chamber is configured as follows: after the oil-gas separator and the compressor inlet pipe are installed, the chamber formed by the outside of the filter element structure in the oil-gas separator and the wall of the compressor inlet pipe. The gas flow area inside the respirator cavity is smaller than the gas flow area inside the intercooler support cavity, and the gas flow area inside the oil-gas separation cavity is smaller than the gas flow area inside the respirator cavity.

7. An integrated oil-gas separation system for an engine as described in claim 1, characterized in that, One end of the compressor intake pipe is provided with a first intake port, which is connected to an air filter. Near the first intake port, there is a compressor intake chamber, which is connected to the first intake port. The side of the compressor inlet pipe is provided with several second inlets, and the several second inlets are respectively connected to the outlets of several oil-gas separators through pipelines. The side of the compressor inlet pipe is also provided with several first outlets, which are respectively connected to the compressor inlet.

8. An integrated oil-gas separation system for an engine as described in claim 1, characterized in that, The compressor inlet pipe has an oil collection chamber at its bottom. The oil collection chamber is configured as follows: after the oil-gas separator is installed with the compressor inlet pipe, the bottom of the filter element structure in the oil-gas separator and the wall of the compressor inlet pipe form a cavity. The oil collection chamber has an oil outlet, and the oil outlet is connected to a return oil pipeline. A one-way valve is provided on the return oil pipeline.

9. An integrated oil-gas separation system for an engine as described in claim 1, characterized in that, The respirator cavity is provided with a bypass valve mounting port, which is used to install a bypass valve.

10. A method of using an integrated oil-gas separation system for an engine as described in any one of claims 1-9, characterized in that, include: The exhaust gas in the crankcase is discharged from the exhaust outlet at the top of the engine block and enters the intercooler bracket cavity formed by the intercooler bracket and the top of the engine block for primary pre-filtration. The exhaust gas then flows into the breather cavity with a reduced gas flow area for secondary pre-filtration. The exhaust gas changes direction multiple times between the cavities, increasing the condensation of oil and gas into oil droplets and backflow, thus achieving multi-stage pre-filtration. The exhaust gas after secondary pre-filtration enters the oil-gas separation chamber integrated on the compressor inlet pipe through the first pipeline, and further flows into the oil-gas separator in the oil-gas separation chamber for fine filtration. The separated clean gas flows into the compressor inlet pipe through the oil-gas separator outlet and flows to the compressor. The separated oil is collected by gravity into the oil collection chamber at the bottom of the compressor intake pipe, and then returned to the oil pan through the return oil line with a one-way valve.

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