Double-stage filtering air inlet system of heavy truck and method of double-stage filtering air inlet system

Abstract

The invention discloses a double-stage filtering air inlet system and method for a heavy truck, and the system comprises an air inlet channel assembly, a first-stage filtering assembly, a connecting pipeline, a second-stage filtering assembly and an air outlet corrugated pipe which are connected in sequence. Then the air flows through a first-stage filtering assembly with an oil bath device, a connecting pipeline and a second-stage filtering assembly with an air filter in sequence, and finally enters an engine supercharger through an air outlet corrugated pipe; the air inlet system is integrally arranged on a vehicle frame, and the secondary filter assembly is flexibly connected with the vehicle frame through the suspension mounting assembly. Through the two-stage filtering structure, the dust holding capacity is remarkably improved, and the maintenance period is prolonged; the design of high-position air inlet and flow guide grooves reduces negative pressure and reduces rainwater suction; the oil bath efficiently drains water, and the water inflow risk of the engine is reduced; and the air outlet corrugated pipe improves the universality and the assembly flexibility of the system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heavy truck intake system, in particular to a two-stage filtering intake system for heavy truck and a method thereof. BACKGROUND

[0002] The intake system is an important component of the engine accessories of a commercial vehicle, and the air cleaner (hereinafter referred to as the air filter) is the most important component in the intake system and is a component for filtering the air entering the engine cylinder, which mainly functions to filter the harmful impurities in the air entering the engine cylinder to reduce the early wear of the cylinder, piston, piston ring, valve and valve seat.

[0003] The automobile engine is a very precise machine, and even a small amount of impurities can damage the engine. In the prior art, most intake systems adopt a single filtering mode; however, in a harsh environment, a single air filter is difficult to effectively remove water and dust, and is prone to failure, thereby causing insufficient power of the engine, and in severe cases, the engine may be damaged, and the supercharger may leak oil.

[0004] Therefore, the existing intake system adopts a single filtering mode, which cannot meet the water and dust removal requirements under complex working conditions, and is difficult to adapt to the position of the supercharger intake port of different types of engines. SUMMARY

[0005] The present application aims to provide a two-stage filtering intake system for heavy truck and a method thereof, which aims to solve the technical problems of insufficient dust and water removal capacity and poor system versatility of the traditional single filtering intake system of heavy trucks under complex and harsh working conditions.

[0006] The present application solves the above problems by the following technical solutions:

[0007] A two-stage filtering intake system for heavy truck, comprising: an intake duct assembly, a primary filtering assembly, a connecting pipeline, a secondary filtering assembly and an air outlet corrugated pipe connected in sequence, wherein the external air first enters the intake duct assembly, then sequentially flows through the primary filtering assembly with an oil bath, the connecting pipeline, the secondary filtering assembly with an air filter, and finally enters the engine supercharger through the air outlet corrugated pipe; the intake system is arranged on the frame as a whole, and the secondary filtering assembly is flexibly connected with the frame through a suspension mounting assembly.

[0008] The air inlet channel assembly comprises an air inlet channel and a corrugated pipe, the air inlet channel adopts high-position lateral air inlet, the upper side of the air inlet channel is provided with an air inlet, and the bottom of the air inlet channel is connected with the primary filter assembly through the corrugated pipe; the primary filter assembly comprises an oil bath device provided with an air inlet port and an air outlet port, and an oil bath device air inlet pipe and an oil bath device air outlet pipe, the air inlet port of the oil bath device is connected with the corrugated pipe through the oil bath device air inlet pipe, and the air outlet port is connected with the connecting pipeline through the oil bath device air outlet pipe; the connecting pipeline comprises a connecting hard pipe and a connecting rubber pipe connected with each other and connected with the oil bath device air outlet pipe and the air cleaner air inlet port respectively; the secondary filter assembly comprises an air cleaner provided with an air cleaner air inlet port and an air cleaner air outlet port, and the air cleaner air outlet port is connected with the engine supercharger through an air outlet corrugated pipe.

[0009] As a further improvement of the application, the air inlet channel is provided with a dust removal valve near the side of the bottom, and the dust removal port axis of the dust removal valve is arranged obliquely downward at an acute angle with the vertical direction.

[0010] As a further improvement of the application, the air inlet channel is further provided with a plurality of fixed point structures, a plurality of guide grooves for combing airflow, an air inlet grille and an air outlet of the air inlet channel connected with the corrugated pipe; wherein the plurality of fixed point structures comprise an upper air inlet channel fixed point, a middle air inlet channel fixed point, a left air inlet channel fixed point and a right air inlet channel fixed point, so as to fix the air inlet channel behind the cab; the air inlet grille is located at the air inlet position of the air inlet channel to prevent foreign matters from being sucked in.

[0011] As a further improvement of the application, the primary filter assembly and the air inlet channel assembly are located on the same side of the vehicle frame, and further comprising an oil bath device fixed support installed on the outer side of the vehicle frame; the oil bath device fixed support comprises a front support, a rear support and a pull rod connecting the two; one end of the front support and the rear support is provided with an arc-shaped notch and a screw hole for connecting the oil bath device, and the other end is formed with a fixed part for fixing with the vehicle frame.

[0012] As a further improvement of the application, the front support and the rear support are symmetrically arranged, and the fixed part of the fixed part for fixing with the vehicle frame is fixed by the outward and inward "L" type structure to form a "T" type fixed part.

[0013] As a further improvement of the application, a plurality of blind holes are formed on the inward "L" type structure to facilitate welding of the outward and inward "L" type structure through the blind holes.

[0014] As a further improvement of the application, the secondary filter assembly further comprises an air cleaner fixed support and an air cleaner mounting point on the air cleaner, the air cleaner fixed support is installed in cooperation with the air cleaner mounting point, and the air cleaner fixed support is installed on a suspension mounting assembly located on the side of the vehicle frame, so that the air cleaner is mounted on the top of the left and right vehicle frames.

[0015] As a further improvement of the present application, the air filter fixing support is of a "C" type structure, the two ends of which are connected with the frame through suspension mounting assemblies, and the middle part is installed in cooperation with the air filter mounting point.

[0016] As a further improvement of the present application, the air filter is integrated with an air filter alarm switch, which triggers the indicator light in the cab when the filter element of the air filter is blocked to cause the air intake resistance to increase to a set value.

[0017] Meanwhile, the present application also solves the above problems through the following technical solutions:

[0018] A two-stage filtering method for heavy trucks is realized through the above-mentioned two-stage filtering air intake system for heavy trucks, and comprises the following steps:

[0019] S100, air intake and preliminary flow guiding;

[0020] The external air enters from the air inlet arranged at the high side of the air inlet channel and is subjected to airflow combing through the flow guiding groove in the air inlet channel, so as to reduce the air intake negative pressure and preliminarily separate the liquid water;

[0021] S200, primary filtering;

[0022] The air after preliminary flow guiding enters the corrugated pipe through the air outlet of the air inlet channel, and is then guided into the oil bath through the oil bath inlet pipe; primary filtering is performed inside the oil bath to remove most of the dust and oily impurities in the air and to realize water separation and discharge;

[0023] S300, secondary filtering;

[0024] The air after primary filtering flows out from the oil bath outlet pipe, enters the air filter inlet of the air filter through the connecting pipeline composed of the connecting hard pipe and the connecting rubber pipe; secondary fine filtering is performed inside the air filter to remove the residual fine particulate matters in the air;

[0025] S400, clean air output;

[0026] The clean air after secondary fine filtering is transported to the air inlet of the engine supercharger through the outlet corrugated pipe; the form of the outlet corrugated pipe is adjusted to adapt to the positions of the air inlets of different engine superchargers.

[0027] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0028] (1) The application adopts a dual-pole air filtering mode, significantly improves the dust holding capacity of the air filter, helps to prolong the maintenance cycle of the air intake system and the replacement interval of the filter element. The first-stage filtering adopts an oil bath type filtering mode, can efficiently discharge moisture, further reduces the possibility of rain entering the air filter, reduces the air intake system resistance and the risk of engine water entry.

[0029] (2) The air intake passage of the application adopts a high-position air intake design, the high-position air intake pipe design adopts a large-area air inlet and a smooth inner wall structure to reduce the gas flow resistance and improve the air intake efficiency. Under complex working conditions, the high-position air intake design can effectively cope with the dusty conditions, reduce the filter element replacement frequency, and enhance the reliability of the engine under severe road conditions. Combined with reasonable air flow direction planning, the air inlet negative pressure is effectively reduced, thereby reducing the risk of rain being sucked into the air intake passage.

[0030] (3) The application adopts an adjustable air outlet bellows structure, the supercharger air inlet end adopts a bellows form, which can adapt to superchargers of different engines and different installation positions. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a structural schematic view of a two-stage filtering air intake system of a heavy truck of the application;

[0032] Figure 2 is a front view schematic view of a two-stage filtering air intake system of a heavy truck of the application;

[0033] Figure 3 is a right view schematic view of a two-stage filtering air intake system of a heavy truck of the application;

[0034] Figure 4 is a left view schematic view of a two-stage filtering air intake system of a heavy truck of the application;

[0035] Figure 5 is a top view schematic view of a two-stage filtering air intake system of a heavy truck of the application;

[0036] Figure 6 is a structural schematic view of an air intake passage of the application;

[0037] Figure 7 is a structural schematic view of an oil bath fixing support of the application;

[0038] Figure 8 is still another structural schematic view of a two-stage filtering air intake system of a heavy truck of the application.

[0039] Figures: 1, air inlet assembly; 11, air inlet; 111, upper air inlet fixing point; 112, middle air inlet fixing point; 113, left air inlet fixing point; 114, right air inlet fixing point; 115, air inlet grille; 116, guide groove; 117, air outlet of air inlet; 12, corrugated pipe; 13, dust removal valve; 2, primary filter assembly; 21, oil bath; 22, air inlet pipe of oil bath; 23, air outlet pipe of oil bath; 24, fixing support of oil bath; 241, front support; 242, rear support; 243, pull rod; 3, connecting pipeline; 31, hard connecting pipe; 32, rubber connecting pipe; 4, secondary filter assembly; 41, air filter; 42, air inlet of air filter; 43, air outlet of air filter; 44, alarm switch of air filter; 45, air outlet corrugated pipe; 46, fixing support of air filter; 47, mounting point of air filter; 5, vehicle frame; 6, suspension mounting assembly. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0041] Referring to the drawings Figures 1-8 A two-stage filtering air intake system structure of a heavy truck, comprising: an air inlet assembly 1, a primary filter assembly 2, a connecting pipeline 3, and a secondary filter assembly 4, etc., which are arranged on a vehicle frame 5 and are flexibly connected with the vehicle body through a suspension mounting assembly 6. The core working principle is two-stage filtering of air: external air first enters the air inlet assembly 1, then sequentially flows through the primary filter assembly 2 with an oil bath, the connecting pipeline 3, and the secondary filter assembly 4 with an air filter, and finally enters the engine supercharger through the air outlet corrugated pipe 45.

[0042] In a specific embodiment, the air inlet assembly 1 comprises: an air inlet 11, a corrugated pipe 12, and a dust removal valve 13. The air inlet 11 has an air inlet on the upper side, which is used to introduce external air. The bottom of the air inlet 11 is connected with the corrugated pipe 12. The side of the air inlet 11 close to the bottom is provided with the dust removal valve 13, and the dust outlet axis of the dust removal valve 13 is arranged obliquely downward at an acute angle with the vertical direction. As a preferred, the acute angle is 30°.

[0043] The primary filter assembly 2 comprises an oil bath 21, an oil bath air inlet pipe 22, an oil bath air outlet pipe 23, and an oil bath fixing bracket 24. The oil bath 21 is provided with an air inlet port and an air outlet port. The air inlet port is communicated with the corrugated pipe 12 through the oil bath air inlet pipe 22, so as to flow external air into the oil bath 21. The air outlet port is provided with the oil bath air outlet pipe 23, which is used to connect the secondary filter assembly 4. The oil bath fixing bracket 24 is used to install the oil bath 21 of the primary filter assembly 2 on the side of the vehicle frame 5. The oil bath fixing bracket 24 is composed of a front bracket 241, a rear bracket 242, and a connecting rod 243 connecting the two brackets, forming a stable support structure, which can withstand the vibration and impact during vehicle driving, and ensure the reliable operation of the oil bath.

[0044] The connecting pipeline 3 comprises a connecting hard pipe 31 and a connecting rubber pipe 32, which are connected with the air filter 41 and the oil bath 21 respectively. The connecting pipeline 3 connects the oil bath air outlet pipe 23 with the air inlet port of the air filter, so that air flows into the air filter through the connecting pipeline.

[0045] The secondary filter assembly 4 comprises an air filter 41, an air filter air inlet port 42, an air filter air outlet port 43, an air filter alarm switch 44, an air outlet corrugated pipe 45, an air filter fixing bracket 46, and an air filter mounting point 47. The air filter 41 is installed on the vehicle frame 5 through the air filter fixing bracket 46. The housing of the air filter 41 is provided with the air filter mounting point 47 for connecting with the air filter fixing bracket 46. The air filter 41 is integrated with the air filter alarm switch 44. When the air inlet resistance increases to a set value due to the blockage of the filter element, the alarm switch triggers the indicator light in the cab, reminding the driver to maintain or replace the filter element in time. The air filter 41 is provided with an air inlet port and an air outlet port. The air inlet port is communicated with the air inlet channel, so as to flow external air into the air filter. In the embodiment, the air inlet port of the air filter 41 is communicated with the connecting rubber pipe 32 of the connecting pipeline 3. The air outlet corrugated pipe 45 is connected between the air filter air outlet port 43 and the supercharger, so as to send the filtered air of the air filter into the supercharger.

[0046] One end of the air outlet corrugated pipe 45 is connected to the straight pipe section of the air filter air outlet port 43, and the other end is connected to the position of the supercharger air inlet port. Due to the good flexibility and scalability of the corrugated pipe, the shape and length of the corrugated pipe can be adjusted through bending, stretching or compression according to the differences in the spatial positions of the supercharger air inlet ports of different models of engines, so as to realize "one pipe for multiple uses", and improve the universality and assembly flexibility of the entire air intake system.

[0047] In an optional embodiment, the air inlet channel 11 adopts high-position lateral air intake, and is provided with a plurality of fixed point structures, an air inlet grille 115, a plurality of guide grooves 116, and an air outlet 117. The plurality of fixed point structures include an upper air inlet channel fixed point 111, a middle air inlet channel fixed point 112, a left air inlet channel fixed point 113, and a right air inlet channel fixed point 114, which can reliably fix the air inlet channel 11 at the rear of the cab and ensure structural stability. The upper air inlet channel fixed point 111 is located at the upper end of the air inlet channel 11, the middle air inlet channel fixed point 112 is located near the air inlet grille 115 at the middle of the air inlet channel 11, and the left and right air inlet channel fixed points 113 and 114 are arranged on the left and right sides of the lower end of the air inlet channel 11. The air inlet grille 115 is located on the side of the air inlet channel 11 away from the frame, which can effectively prevent large-size foreign matters such as leaves and flying insects from being sucked in. The plurality of guide grooves 116 are used to comb the airflow, reduce turbulence and air inlet resistance, and guide the possible entering rainwater to be discharged outward, thereby further reducing the risk of rainwater being sucked in. The guide grooves 116 are arranged on the side of the air inlet channel 11 facing the primary filter assembly 2 and avoid the middle air inlet channel fixed point 112. The air outlet 117 is located at the lower end of the air inlet channel 11 and is used to connect with the corrugated pipe 12, which has a certain compensation and damping effect.

[0048] The oil bath device 21 is installed on one side of the frame through an oil bath device fixing support 24, and is located on the same side of the frame as the air inlet channel assembly 1. Preferably, the oil bath device fixing support 24 includes a front support 241, a rear support 242, and a pull rod 243. The front support 241 and the rear support 242 are symmetrically arranged, and the pull rod 243 is connected between the front support 241 and the rear support 242. One end of the front support 241 and the rear support 242 is used to connect the oil bath device 21, and is provided with a downward arc-shaped notch and a plurality of screw holes around the arc-shaped notch, so as to pass through the arc-shaped notch to avoid the overturning buckle of the oil bath device 21 and achieve predetermined positioning. Screws pass through the plurality of screw holes around the arc-shaped notch and cooperate with the oil bath device mounting point of the oil bath device 21 to achieve installation and fixation. The other end is used to be fixed with the frame and forms an outward "L"-shaped fixing part, and screws pass through the screw holes of the outward "L"-shaped fixing part and are connected with the frame. In order to further improve the installation strength, the other end of the front support 241 and the rear support 242 is further provided with an inward "L"-shaped fixing part fixed with the outward "L"-shaped fixing part, so as to form a "T"-shaped fixing part. Preferably, the inward "L"-shaped fixing part avoids the pull rod 243 and is arranged in the outward "L"-shaped fixing part, and a plurality of blind holes are formed in the inward "L"-shaped fixing part, which are used to weld the outward and inward "L"-shaped fixing parts through the blind holes to increase the welding strength.

[0049] The connecting pipeline 3 is arranged above the left and right frames and is used for being communicated with the secondary filter assembly 4 arranged on the left and right frames. Specifically, the air filter fixing support 46 is a "C" type structure, two ends of which are arranged on the left and right frames, and the middle part of which is arranged in parallel with the secondary filter assembly 4. Further, the two ends of the air filter fixing support 46 are connected with the suspension mounting assembly 6 arranged on the outer sides of the left and right frames respectively, so as to fix the whole intake system structure to the mounting point of the heavy truck frame. The suspension mounting assembly can protect the precise air filter element and the whole pipeline system, and avoid damage due to deformation and impact of the frame.

[0050] Specific effects and considerations are as follows

[0051] The specific air flow path of the two-stage filtering intake system structure of the heavy truck is as follows:

[0052] Intake and preliminary flow guide: external air enters from the air inlet on the side of the air inlet channel 11, the air inlet is located at the air inlet grille 115, after being preliminarily blocked by the air inlet grille 115, the air forms a reasonable air flow direction under the guidance of the flow guide groove 116, so as to reduce the intake negative pressure.

[0053] Primary filtering: air enters the corrugated pipe 12 through the air outlet 117 of the air inlet channel, and then is introduced into the oil bath device 21 through the oil bath device air inlet pipe 22. In the oil bath device 21, most of the dust, moisture and oily impurities in the air are adsorbed and separated by the oil, realizing efficient first-stage filtering and water drainage.

[0054] Secondary filtering: the air filtered by the first-stage filtering flows out from the oil bath device air outlet pipe 23, enters the air filter air inlet 42 of the air filter 41 through the connecting pipeline 3 composed of the connecting hard pipe 31 and the connecting rubber pipe 32. In the air filter 41, the air is finely filtered by the filter element, and the remaining smaller particles are removed, realizing second-stage filtering.

[0055] Output stage: clean air is discharged from the air filter air outlet 43 and is directly delivered to the air inlet of the engine supercharger through the air outlet corrugated pipe 45.

[0056] An assembly method, comprising the following steps: determining the coordinates of the engine supercharger on the whole vehicle; confirming the shape of the air outlet corrugated pipe according to the coordinates of the engine and the arrangement of the intake system; connecting the air outlet corrugated pipe, the air filter air outlet and the supercharger air inlet after adaptation.

[0057] The application adopts a bipolar filtering air mode, greatly improves the dust holding capacity of the air filter, can effectively improve the maintenance period of the air intake system, and prolongs the replacement period of the filter element; the air inlet adopts high air inlet and reasonable airflow division direction, greatly reduces the negative pressure of the air inlet, rainwater is not easy to be sucked into the air inlet by negative pressure, and the first-stage filter adopts an oil bath filter, which can realize high-efficiency drainage efficiency, effectively reduce the possibility of rainwater entering the air filter, and reduce the resistance of the air intake system and the risk of engine water entering.

[0058] Although the application has been described with reference to the explanatory embodiments thereof, the above-described embodiments are merely the preferred embodiments of the application, and the embodiments of the application are not limited to the above-described embodiments. It should be understood that those skilled in the art can design many other modifications and embodiments, which will fall within the scope and spirit of the principles disclosed in the present application.

Claims

1. A double-stage filtering intake system for heavy-duty vehicles, characterized in that, It comprises: The air inlet channel assembly, the primary filter assembly, the connecting pipeline, the secondary filter assembly and the air outlet bellows are connected in sequence, and the external air first enters the air inlet channel assembly, then flows through the primary filter assembly with an oil bath, the connecting pipeline, the secondary filter assembly with an air filter in sequence, and finally enters the engine supercharger through the air outlet bellows; the air inlet system is arranged on the frame as a whole, and the secondary filter assembly is flexibly connected with the frame through the suspension mounting assembly; The air inlet channel assembly comprises: an air inlet channel and a bellows, the air inlet channel adopts high-position lateral air inlet, the upper side thereof is provided with an air inlet, and the bottom thereof is connected with the primary filter assembly through the bellows; The primary filter assembly comprises: an oil bath with an air inlet port and an air outlet port, and an oil bath air inlet pipe and an oil bath air outlet pipe, the air inlet port of the oil bath is connected with the bellows through the oil bath air inlet pipe, and the air outlet port is connected with the connecting pipeline through the oil bath air outlet pipe; The connecting pipeline comprises: a connecting hard pipe and a connecting rubber pipe connected with each other, and connected with the oil bath air outlet pipe and the air filter air inlet respectively; The secondary filter assembly comprises: an air filter with an air filter air inlet and an air filter air outlet, and the air filter air outlet is connected with the engine supercharger through the air outlet bellows.

2. The dual-stage filtration intake system for heavy duty vehicles of claim 1, wherein, The air inlet channel is provided with a dust removal valve on the side close to the bottom, and the dust removal port axis of the dust removal valve is arranged obliquely downward at an acute angle with the vertical direction.

3. The dual-stage filtration intake system for heavy duty vehicles of claim 1, wherein, The air inlet channel is further provided with a plurality of fixing point structures, a plurality of guide grooves for combing airflow, an air inlet grille and an air outlet of the air inlet channel connected with the bellows; wherein the plurality of fixing point structures comprise: an upper air inlet channel fixing point, a middle air inlet channel fixing point, a left air inlet channel fixing point and a right air inlet channel fixing point, so as to fix the air inlet channel behind the cab; The air inlet grille is located at the air inlet position of the air inlet channel to prevent foreign matters from being sucked in.

4. The dual-stage filtration intake system for heavy duty vehicles of claim 1, wherein, The primary filter assembly and the air inlet channel assembly are located on the same side of the frame, and further comprise: an oil bath fixed support mounted on the outer side of the frame; The oil bath fixed support comprises: a front support, a rear support and a pull rod connecting the two; one end of the front support and the rear support is provided with an arc-shaped notch and a screw hole for connecting the oil bath, and the other end is formed with a fixed part for fixing with the frame.

5. The dual-stage filtration intake system of claim 4, wherein, The front support and the rear support are symmetrically arranged, and the fixed part of the fixed part fixed with the frame is fixed by the "L" type structure outward and inward to form the "T" type fixed part.

6. The dual-stage filtration intake system of a heavy duty truck of claim 5, wherein, A plurality of blind holes are formed on the "L" type structure inward to facilitate welding of the "L" type structure outward and inward through the blind holes.

7. The dual-stage filtration intake system for heavy duty vehicles of claim 1, wherein, The secondary filter assembly further comprises: an air filter fixed support and an air filter mounting point on the air filter, the air filter fixed support is installed in cooperation with the air filter mounting point, and is installed on the suspension mounting assembly on the side of the frame through the air filter fixed support, so that the air filter is carried on the top of the left and right frames.

8. The dual-stage filtration intake system of claim 7, wherein, The air filter fixed support is a "C" type structure, and the two ends thereof are connected with the frame through the suspension mounting assembly, and the middle part is installed in cooperation with the air filter mounting point.

9. The dual-stage filtration intake system of claim 1, wherein, The air filter alarm switch is integrated on the air filter, and when the filter element of the air filter is blocked to cause the air inlet resistance to increase to a set value, the alarm switch triggers the indicator light in the cab.

10. A method for dual-stage filtering of intake air of a heavy-duty vehicle, implemented by a dual-stage filtering intake system of a heavy-duty vehicle according to any one of claims 1-9, characterized in that, The method comprises the following steps: S100, air intake and preliminary flow guide; External air enters from the air intake port arranged on the high side of the air intake channel, and the air flow is combed through the flow guide groove in the air intake channel to reduce the negative pressure of the intake air and preliminarily separate the liquid water; S200, primary filtration; After the preliminary flow guide, the air enters the corrugated pipe through the air intake port of the air intake channel, and then is introduced into the oil bath through the oil bath air inlet pipe. The primary filtration is carried out inside the oil bath to remove most of the dust and oily impurities in the air and achieve water separation and discharge; S300, secondary filtration; The air after the primary filtration flows out from the oil bath air outlet pipe, enters the air cleaner air inlet port of the air cleaner through the connecting pipeline composed of the connecting hard pipe and the connecting rubber pipe, and the secondary fine filtration is carried out inside the air cleaner to remove the remaining fine particles in the air; S400, clean air output; The clean air after the secondary fine filtration is transported to the air inlet port of the engine supercharger through the air outlet corrugated pipe. The shape of the air outlet corrugated pipe is adjusted to adapt to the position of the air inlet port of different engine superchargers.

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