An oil and gas separator

Abstract

The utility model provides a kind of oil-gas separator, it is related to engine design manufacturing technical field.The oil-gas separator includes box and the filter assembly and centrifugal component arranged in box.The filter assembly and centrifugal component will be formed by the inner chamber of box and be separated first chamber, second chamber and third chamber.On this basis, box is equipped with the air inlet being communicated with first chamber, for introducing from crankcase oil blow-by gas, and simultaneously being equipped with the air outlet being communicated with second chamber, for discharging after separation clean gas. Therefore, with airflow from air inlet to air outlet, filter assembly and centrifugal component are used to sequentially carry out primary filtration and secondary filtration to airflow.Based on the multistage separation filtration mechanism, the effective removal of different particle size oil droplets is realized, and the overall separation efficiency and operating stability are improved.

Description

Technical Field

[0001] This utility model relates to the field of engine design and manufacturing technology, and more specifically, to an oil-gas separator. Background Technology

[0002] During engine operation, some high-pressure combustible mixture and burned exhaust gases can seep into the crankcase through the piston ring gaps, forming crankcase blow-by. These blow-by gases contain unburned fuel, water vapor, acidic substances, and suspended oil droplets.

[0003] To prevent blow-by gas from diluting and deteriorating the engine oil, and to avoid excessive crankcase pressure, modern engines employ a forced crankcase ventilation system to redirect blow-by gas into the intake system for re-combustion. Before introducing the blow-by gas into the intake system, effective oil-gas separation is essential to remove any entrained oil components. However, existing oil-gas separators have low separation efficiency, making it difficult to fully meet the requirements for long-term stable engine operation. Utility Model Content

[0004] The purpose of this invention is to provide an oil-gas separator that can achieve multi-stage coordinated separation of airflow, significantly improve separation efficiency, and effectively ensure the long-term stable operation of the engine.

[0005] The embodiments of this utility model can be implemented as follows: In a first aspect, this utility model provides an oil-gas separator, including a housing and a filter assembly and a centrifugal assembly disposed within the housing. The filter assembly and the centrifugal assembly divide the inner cavity of the housing into a first chamber, a second chamber, and a third chamber; The housing is provided with an air inlet communicating with the first chamber and an air outlet communicating with the second chamber; the filter assembly and centrifugal assembly are used to perform primary and secondary filtration of the airflow in sequence.

[0006] In an optional embodiment, the centrifugation assembly includes a centrifuge cylinder, a centrifuge wheel, and a drive element; wherein, the centrifuge cylinder is connected to the inner wall of the housing and has an airflow inlet near the first chamber and an airflow outlet near the third chamber; the centrifuge wheel is rotatably disposed in the inner cavity of the centrifuge cylinder; the drive element is drivenly connected to the centrifuge wheel and is used to drive the centrifuge wheel to rotate.

[0007] In an optional embodiment, the centrifuge assembly further includes a first baffle and a second baffle; wherein one end of the first baffle is connected to the airflow inlet and the other end is connected to the inner top wall of the chamber; one end of the second baffle is connected to the airflow inlet and the other end is connected to the inner bottom wall of the chamber; the first baffle and the second baffle are used to jointly guide the airflow after primary filtration by the filter assembly into the inner cavity of the centrifuge cylinder.

[0008] In an optional embodiment, the centrifugal assembly further includes a composite fiberboard located at the airflow outlet for three-stage filtration of the airflow.

[0009] In an optional embodiment, the centrifugal assembly further includes a scraper connected to and rotating synchronously with the centrifugal wheel to remove deposits from the composite fiberboard.

[0010] In an optional embodiment, the housing has an installation port, and the filter assembly includes an installation frame and a filter screen; wherein the installation frame is detachably connected to the installation port, and the filter screen is disposed inside the installation frame.

[0011] In an optional embodiment, the oil-gas separator further includes a locking assembly connected to the housing for locking the filter assembly inside the housing.

[0012] In an optional embodiment, the filter assembly has a locking groove, and the locking assembly includes a locking member, a positioning member, a sliding member, and an elastic element; wherein, the locking member cooperates with the locking groove; the positioning member is fixedly connected to the housing and has a sliding hole; the sliding member passes through the sliding hole, slides with the sliding hole, and is connected to the locking member; the elastic element is sleeved on the sliding member, and its two ends abut against the positioning member and the locking member respectively.

[0013] In an optional embodiment, the oil-gas separator further includes an oil return assembly, which is in communication with at least one of the first chamber, the second chamber, and the third chamber.

[0014] In an optional embodiment, the oil return assembly includes a first oil return pipe, a second oil return pipe, and a third oil return pipe, and the first oil return pipe, the second oil return pipe, and the third oil return pipe are respectively connected to the first chamber, the second chamber, and the third chamber.

[0015] The beneficial effects of the oil-gas separator provided in this embodiment of the present invention include: This invention provides an oil-gas separator. The oil-gas separator includes a housing and a filter assembly and a centrifugal assembly housed within the housing. The filter assembly and centrifugal assembly divide the inner cavity of the housing into a first chamber, a second chamber, and a third chamber. The housing has an inlet communicating with the first chamber to introduce oil-containing gas from the crankcase, and an outlet communicating with the second chamber to discharge the separated clean gas. Thus, as the airflow flows from the inlet to the outlet, the filter assembly and centrifugal assembly sequentially perform primary and secondary filtration on the airflow. Based on this multi-stage separation and filtration mechanism, effective removal of oil droplets of different particle sizes is achieved, improving overall separation efficiency and operational stability. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the oil-gas separator provided in this embodiment; Figure 2 This is a schematic diagram of the oil-gas separator provided in this embodiment from another perspective. Figure 3 This is a schematic cross-sectional view of the oil-gas separator provided in this embodiment; Figure 4 This is a schematic diagram of the structure of the filter assembly provided in this embodiment; Figure 5 This is a schematic diagram of the locking assembly provided in this embodiment; Figure 6 This is a schematic diagram of the centrifuge assembly provided in this embodiment; Figure 7 This is a schematic diagram of the centrifuge assembly provided in this embodiment from another perspective.

[0018] Icons: 10-Oil-Gas Separator; 100-Box; 101-Mounting Port; 103-Air Inlet; 105-Air Outlet; 107-Mounting Bracket; 110-First Chamber; 130-Second Chamber; 150-Third Chamber; 200-Filter Assembly; 210-Mounting Frame; 211-Locking Groove; 220-Seal; 230-Filter Screen; 300-Centrifugal Assembly; 310-Centrifugal Cylinder; 311-Air Inlet; 313-Air Outlet; 315-Oil Return Port; 320-Centrifugal Wheel; 330-Drive Element; 341-First Baffle; 343 - Second baffle; 350- Composite fiberboard; 370- Scraper; 400- Locking assembly; 410- Locking element; 411- Connecting part; 413- Locking part; 420- Positioning element; 421- Limiting groove; 430- Sliding element; 440- Elastic element; 450- Grip element; 460- Limiting element; 500- Oil return assembly; 510- First oil return pipe; 520- Second oil return pipe; 530- Third oil return pipe; 540- Connecting pipe; 550- Collection bottle; 560- Return pipe; 600- Vibration motor; 710- Air inlet pipe; 730- Air outlet pipe. Detailed Implementation

[0019] The oil-gas separators in related technologies have low separation efficiency, making it difficult to effectively remove fine oil droplets and impurities from the airflow, and thus failing to fully meet the requirements for long-term stable engine operation.

[0020] To address the aforementioned issues, this invention provides an oil-gas separator that enables multi-stage coordinated separation of airflow, significantly improving separation efficiency and effectively ensuring the long-term stable operation of the engine.

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0026] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0027] The following describes in detail the overall structure, working principle, and technical effects of the oil-gas separator provided by this utility model through embodiments and in conjunction with the accompanying drawings.

[0028] Please see Figures 1 to 3This utility model provides an oil-gas separator 10, applied in the field of engine design and manufacturing technology. It enables multi-stage coordinated separation of airflow, significantly improving separation efficiency and effectively ensuring the long-term stable operation of the engine. The oil-gas separator 10 includes a housing 100 and a filter assembly 200 and a centrifugal assembly 300 disposed within the housing 100. The filter assembly 200 and the centrifugal assembly 300 divide the inner cavity of the housing 100 into a first chamber 110, a second chamber 130, and a third chamber 150.

[0029] Based on this, the housing 100 is provided with an air inlet 103 communicating with the first chamber 110 for introducing oil-containing blow-by gas from the crankcase, and simultaneously with an air outlet 105 communicating with the second chamber 130 for discharging the separated clean gas. Thus, as the airflow flows from the air inlet 103 to the air outlet 105, the filter assembly 200 and the centrifugal assembly 300 sequentially perform primary and secondary filtration on the airflow.

[0030] Specifically, the filter assembly 200, located between the first chamber 110 and the second chamber 130, performs primary filtration of the airflow to intercept larger oil droplets and solid impurities. Subsequently, the centrifugal assembly 300, located between the second chamber 130 and the third chamber 150, performs secondary filtration of the airflow to remove fine oil mist particles. Based on this multi-stage separation and filtration mechanism, effective removal of oil droplets of different sizes is achieved, improving overall separation efficiency and operational stability.

[0031] Please refer to it again. Figures 1 to 3 The oil-gas separator 10 also includes an inlet pipe 710 and an outlet pipe 730. The inlet pipe 710 is located at the inlet 103 of the housing 100 and is connected to the outlet passage of the crankcase, used to introduce oil-containing gas from the crankcase into the first chamber 110; the outlet pipe 730 is located at the outlet 105, used to guide the clean gas after multi-stage separation to be discharged.

[0032] Furthermore, a mounting bracket 107 is fixedly connected to the housing 100. The position of the mounting bracket 107 can be flexibly arranged and adjusted according to the actual assembly space and engine layout to adapt to the installation requirements of different models. The mounting bracket 107 has multiple pin holes, which are spaced apart along the length direction or at specific positions for connection with external structures (such as engine blocks) by bolts, pins or fasteners.

[0033] Please refer to it again. Figure 1 combine Figure 3 In an optional embodiment, the oil-gas separator 10 further includes an oil return assembly 500, which is connected to at least one of the first chamber 110, the second chamber 130 and the third chamber 150, for collecting liquid oil that separates from and converges from the gas flow during the multi-stage separation process.

[0034] Furthermore, the oil return assembly 500 includes a first oil return pipe 510, a second oil return pipe 520, and a third oil return pipe 530, and the first oil return pipe 510, the second oil return pipe 520, and the third oil return pipe 530 are respectively connected to the first chamber 110, the second chamber 130, and the third chamber 150, for independently and efficiently recovering and reusing the liquid oil generated in each stage.

[0035] To facilitate the centralized flow of liquid oil separated from each chamber, the oil return assembly 500 also includes a connecting pipe 540. The connecting pipe 540 is angled, merging the first oil return pipe 510, the second oil return pipe 520, and the third oil return pipe 530, and connecting to a collection bottle 550 equipped with a filter screen via the third oil return pipe 530. The oil filtered by the collection bottle 550 is then transported to the engine oil pan via the oil pan return pipe 560, achieving oil recycling.

[0036] Furthermore, an anti-siphon check valve is provided at the oil return port 315 of the return pipe 560 to prevent the engine intake manifold from drawing oil out of the oil return port 315 in reverse under negative pressure, thereby ensuring that the separated oil can flow back to the oil pan stably and reliably, avoiding abnormal consumption or system contamination.

[0037] In addition, the oil-gas separator 10 may also include a vibration motor 600, which is fixedly connected to the housing 100. In specific applications, the vibration motor 600 can be started and stopped intermittently to transmit vibration force to the filter assembly 200, centrifugal assembly 300 and the walls of each chamber inside the housing 100, effectively preventing excessive accumulation of oil and impurities on the surface of key components, thereby ensuring long-term stability of oil-gas separation efficiency and oil return efficiency.

[0038] The structure and function of the filter assembly 200 and the centrifugal assembly 300 will then be explained sequentially along the airflow path. For example... Figure 2 As shown, the housing 100 has a mounting port 101. Accordingly, as Figure 4 As shown, the filter assembly 200 includes a mounting frame 210 and a filter screen 230. The mounting frame 210 is detachably connected to the mounting port 101 for easy assembly, maintenance, and replacement. The filter screen 230 is disposed within the mounting frame 210 and is used for preliminary purification of oily gas entering the first chamber 110.

[0039] It should be noted that the mounting frame 210 is tightly fitted to the inner wall of the housing 100 to achieve effective isolation between the first chamber 110 and the second chamber 130, preventing unfiltered oily gas from bypassing and leaking directly into the downstream chamber, thus reducing the separation efficiency.

[0040] In addition, to further improve the sealing performance, the filter assembly 200 also includes a seal 220, which is disposed between the mounting frame 210 and the housing 100, specifically in the mating area between the outer periphery of the mounting frame 210 and the mounting port 101, and is used to form a tight seal with the mounting port 101 after the mounting frame 210 is installed to prevent airflow leakage.

[0041] Furthermore, to prevent the filter assembly 200 from shaking or detaching during long-term operation, the oil-gas separator 10 also includes a locking assembly 400, which is connected to the housing 100 and used to lock the filter assembly 200 inside the housing 100, thereby ensuring effective isolation between the first chamber 110 and the second chamber 130 and preventing the leakage of unfiltered oily gas.

[0042] Specifically, the filter assembly 200 (i.e., the mounting frame 210 mentioned above) has a locking groove 211, which is used to lock with the locking assembly 400 to securely fix the filter assembly 200 within the mounting opening 101 of the housing 100. In optional embodiments, such as Figure 5 As shown, the locking assembly 400 includes a locking member 410, a positioning member 420, and a sliding member 430.

[0043] The locking member 410 engages with the locking groove 211. The positioning member 420 is fixedly connected to the housing 100 and has a sliding hole. The sliding member 430 passes through the sliding hole, slides within the sliding hole, and is connected to the locking member 410. In addition to the above, the locking assembly 400 also includes an elastic element 440, which is sleeved on the sliding member 430, with its two ends abutting against the positioning member 420 and the locking member 410 respectively.

[0044] Therefore, under normal operating conditions, the elastic element 440 always pushes the locking element 410 toward the locking groove 211, keeping the two stably locked. When it is necessary to disassemble the filter assembly 200 for maintenance or replacement, the sliding element 430 can be pulled by external force to drive the locking element 410 to overcome the elastic force of the elastic element 440 and move it away from the locking groove 211, thereby unlocking and removing the filter assembly 200.

[0045] To facilitate manual unlocking of the locking assembly 400 by the operator, the locking assembly 400 also includes a grip 450, which is connected to the end of the slider 430 away from the locking assembly 410, so that the user can apply force to pull it.

[0046] Furthermore, to ensure the stability of the sliding member 430 during movement and prevent it from deflecting or jamming, the locking assembly 400 also includes a limiting member 460, which is fixedly connected to the locking member 410 and extends along the direction of movement. Correspondingly, the positioning member 420 is provided with a limiting groove 421 that matches the limiting member 460, and the limiting member 460 is embedded in the limiting groove 421 and can slide back and forth therein.

[0047] Furthermore, the locking member 410 includes a connecting portion 411 and a locking portion 413 connected to the connecting portion 411. The locking portion 413 extends into and engages with the locking groove 211 on the filter assembly 200 to achieve a locking function. The connecting portion 411 is fixedly connected to the sliding member 430 and is driven by the elastic force of the elastic element 440.

[0048] Optionally, the number of locking parts 413 can be one or more, and correspondingly, the locking grooves 211 on the filter assembly 200 are also configured as one or more to achieve single-point or multi-point synchronous locking. In this embodiment, two locking parts 413 are configured, symmetrically arranged on both sides of the connecting part 411, and correspondingly, the mounting frame 210 is provided with two matching locking grooves 211.

[0049] Please see Figure 6 and Figure 7 The centrifugal assembly 300 includes a centrifugal cylinder 310, a centrifugal wheel 320, and a drive element 330. The centrifugal cylinder 310 is connected to the inner wall of the housing 100 and has an airflow inlet 311 and an airflow outlet 313. Specifically, the airflow inlet 311 is located near the first chamber 110 to facilitate the reception of oily gas after primary filtration; while the airflow outlet 313 is located near the second chamber 130 to guide the clean gas after centrifugal separation to the third chamber 150.

[0050] The centrifugal impeller 320 is rotatably disposed within the inner cavity of the centrifugal cylinder 310, with a certain gap maintained between its outer circumference and the inner wall of the centrifugal cylinder 310, forming a vortex channel. The drive element 330 is drivenly connected to the centrifugal impeller 320 and is used to drive the centrifugal impeller 320 to rotate. When the drive element 330 is started, the centrifugal impeller 320 drives the surrounding airflow to rotate synchronously. Under the action of centrifugal force, the denser oil droplets are rapidly thrown towards the inner wall surface of the centrifugal cylinder 310, and then coalesce into a liquid film along the wall surface and flow downward.

[0051] In some embodiments, the oil thrown against the cylinder wall by centrifugal force can flow downwards along the inner wall of the centrifuge cylinder 310, eventually sliding into the second chamber 130 and being discharged through the second oil return pipe 520, thus achieving oil recovery. In other embodiments, to shorten the oil return path, reduce residence time, and improve oil return efficiency, the centrifuge cylinder 310 is provided with an oil drain hole on its cylinder wall. The oil film adhering to the cylinder wall is thrown directly out through the oil drain hole under the action of centrifugal force and enters the third chamber 150. Subsequently, the oil collects in the third chamber 150 and is guided back to the engine oil pan through the third oil return pipe 530, completing efficient recovery.

[0052] Furthermore, the centrifugal assembly 300 also includes a first baffle 341 and a second baffle 343. One end of the first baffle 341 is connected to the airflow inlet 311, and the other end is connected to the inner top wall of the housing 100. One end of the second baffle 343 is connected to the airflow inlet 311, and the other end is connected to the inner bottom wall of the housing 100. In other words, the first baffle 341 and the second baffle 343 extend from both sides of the airflow inlet 311 towards the top and bottom respectively, to jointly guide the airflow filtered by the first-stage filter assembly 200 into the inner cavity of the centrifugal cylinder 310, preventing the filtered airflow from directly entering the third chamber 150.

[0053] Furthermore, the centrifugal assembly 300 also includes a composite fiber plate 350, which is located at the airflow outlet 313 and is used for three-stage filtration of the airflow to further remove residual fine oil mist particles. Specifically, the composite fiber plate 350 is composed of multiple layers of dense fiber materials, which can effectively capture fine oil and gas particles with a particle size of less than 5μm, significantly improving the overall separation efficiency.

[0054] Furthermore, to achieve dynamic self-cleaning of the composite fiberboard 350, the centrifugal assembly 300 also includes a scraper 370, which is connected to and rotates synchronously with the centrifugal wheel 320 to remove deposits from the composite fiberboard 350. Specifically, during the operation of the centrifugal wheel 320, the scraper 370 moves along the surface of the composite fiberboard 350, continuously removing oil, carbon deposits, and other impurities adhering to it, effectively preventing filter pore blockage or reduced flow area due to long-term use.

[0055] Taking the oil-gas separator 10 provided in this embodiment as an example, its working principle is as follows: In use, the intake pipe 710 of the housing 100 is connected to the exhaust passage of the crankcase, and oil-containing gas enters the first chamber 110 of the housing 100 through the intake pipe 710. When the airflow passes through the filter assembly 200, its internal filter screen 230 performs primary filtration (i.e., coarse filtration) on the airflow, effectively intercepting larger oil droplets and solid impurities, and separating some liquid oil from the airflow.

[0056] After primary filtration, the airflow continues to flow into the centrifugal assembly 300. A first baffle 341 and a second baffle 343 are provided at the airflow inlet 311 of the centrifugal assembly 300. The two baffles extend from the airflow inlet 311 to the inner top wall and inner bottom wall of the housing 100, respectively, and connect to form a flow guiding structure. This structure guides the airflow into the inner cavity of the centrifugal cylinder 310, preventing gas that has not undergone secondary centrifugal separation from directly entering the third chamber 150, and ensuring that all airflow participates in the centrifugation process.

[0057] After the drive element 330 is activated, it drives the centrifugal wheel 320 to rotate at high speed inside the centrifugal cylinder 310 via a transmission connection, thereby causing the airflow entering the centrifugal cylinder 310 to rotate synchronously. Under the action of centrifugal force, the denser oil droplets are rapidly thrown towards the inner wall of the centrifugal cylinder 310, coalesce into a liquid film, and slide down the wall surface, achieving secondary separation of oil and gas. The separated clean gas is discharged from the airflow outlet 313 near the second chamber 130.

[0058] During the gas discharge process, the gas undergoes three stages of fine filtration via a composite fiberboard 350 located at the airflow outlet 313. Finally, the clean gas, after three stages of filtration, is discharged through the outlet 105. It is important to emphasize that in the above process, the first return oil pipe 510, the second return oil pipe 520, and the third return oil pipe 530 are respectively connected to the first chamber 110, the second chamber 130, and the third chamber 150, for the independent and efficient recovery and reuse of the liquid oil generated in each stage.

[0059] In summary, this utility model provides an oil-gas separator 10, which includes a housing 100 and a filter assembly 200 and a centrifugal assembly 300 disposed within the housing 100. The filter assembly 200 and the centrifugal assembly 300 divide the inner cavity of the housing 100 into a first chamber 110, a second chamber 130, and a third chamber 150. The housing 100 is provided with an air inlet 103 communicating with the first chamber 110 to introduce oil-containing gas from the crankcase, and simultaneously with an air outlet 105 communicating with the second chamber 130 to discharge the separated clean gas. Thus, as the airflow flows from the air inlet 103 to the air outlet 105, the filter assembly 200 and the centrifugal assembly 300 sequentially perform primary and secondary filtration on the airflow. Based on this multi-stage separation and filtration mechanism, effective removal of oil droplets of different particle sizes is achieved, improving overall separation efficiency and operational stability.

[0060] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. An oil-gas separator, characterized in that, It includes a housing (100) and a filter assembly (200) and a centrifugal assembly (300) disposed within the housing (100); the filter assembly (200) and the centrifugal assembly (300) divide the inner cavity of the housing (100) to form a first chamber (110), a second chamber (130) and a third chamber (150). The housing (100) is provided with an air inlet (103) communicating with the first chamber (110) and an air outlet (105) communicating with the second chamber (130); the filter assembly (200) and the centrifugal assembly (300) are used to perform primary filtration and secondary filtration on the airflow in sequence.

2. The oil-gas separator according to claim 1, characterized in that, The centrifugal assembly (300) includes a centrifugal cylinder (310), a centrifugal wheel (320), and a drive element (330); wherein, the centrifugal cylinder (310) is connected to the inner wall of the housing (100) and has an airflow inlet (311) near the first chamber (110) and an airflow outlet (313) near the third chamber (150); the centrifugal wheel (320) is rotatably disposed in the inner cavity of the centrifugal cylinder (310); the drive element (330) is drivenly connected to the centrifugal wheel (320) and is used to drive the centrifugal wheel (320) to rotate.

3. The oil-gas separator according to claim 2, characterized in that, The centrifugal assembly (300) further includes a first baffle (341) and a second baffle (343); wherein one end of the first baffle (341) is connected to the airflow inlet (311) and the other end is connected to the inner top wall of the housing (100); one end of the second baffle (343) is connected to the airflow inlet (311) and the other end is connected to the inner bottom wall of the housing (100); the first baffle (341) and the second baffle (343) are used to jointly guide the airflow after primary filtration by the filter assembly (200) into the inner cavity of the centrifugal cylinder (310).

4. The oil-gas separator according to claim 2, characterized in that, The centrifugal assembly (300) also includes a composite fiberboard (350), which is located at the airflow outlet (313) and is used to perform three-stage filtration of the airflow.

5. The oil-gas separator according to claim 4, characterized in that, The centrifugal assembly (300) also includes a scraper (370) which is connected to and rotates synchronously with the centrifugal wheel (320) to remove deposits on the composite fiberboard (350).

6. The oil-gas separator according to claim 1, characterized in that, The housing (100) has an installation port (101), and the filter assembly (200) includes an installation frame (210) and a filter screen (230); wherein the installation frame (210) is detachably connected to the installation port (101), and the filter screen (230) is disposed inside the installation frame (210).

7. The oil-gas separator according to any one of claims 1 to 6, characterized in that, The oil-gas separator (10) further includes a locking assembly (400), which is connected to the housing (100) and is used to lock the filter assembly (200) inside the housing (100).

8. The oil-gas separator according to claim 7, characterized in that, The filter assembly (200) has a locking groove (211), and the locking assembly (400) includes a locking member (410), a positioning member (420), a sliding member (430), and an elastic element (440); wherein, the locking member (410) cooperates with the locking groove (211); the positioning member (420) is fixedly connected to the housing (100) and has a sliding hole; the sliding member (430) passes through the sliding hole, slides with the sliding hole, and is connected to the locking member (410); the elastic element (440) is sleeved on the sliding member (430), and its two ends abut against the positioning member (420) and the locking member (410) respectively.

9. The oil-gas separator according to any one of claims 1 to 6, characterized in that, The oil-gas separator (10) further includes an oil return assembly (500) which is in communication with at least one of the first chamber (110), the second chamber (130) and the third chamber (150).

10. The oil-gas separator according to claim 9, characterized in that, The oil return assembly (500) includes a first oil return pipe (510), a second oil return pipe (520) and a third oil return pipe (530), and the first oil return pipe (510), the second oil return pipe (520) and the third oil return pipe (530) are respectively connected to the first chamber (110), the second chamber (130) and the third chamber (150).

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