Air filter and air inlet system

Abstract

The utility model belongs to the technical field of air inlet systems or air purification systems, and relates to an air filter and an air inlet system. Comprising a box body and a box cover, and the box cover is provided with a cover cap and comprises an air inlet part and an air outlet part which are adjacently arranged; the filter element is mounted on the cover cap; the end cover is mounted on the air inlet part and is provided with a main air inlet, and an air inlet cavity is formed between the end cover and the air inlet part; a separation part and an air inlet flow channel are further arranged in the end cover, and at least part of air entering from the main air inlet enters the inner air inlet cavity along the air inlet flow channel. According to the utility model, air entering from the main air inlet, especially air carrying larger dust and impurities, can firstly move along the air inlet flow channel by a circle and then enter the inner air inlet cavity, and in the process, the larger dust and impurities can be remained in the outer air inlet cavity, so that the part of air can be preliminarily filtered, the filtering pressure of the filter element is reduced, and the service life of the filter element is prolonged. The service life of the filter element is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of air intake systems or air purification systems, and relates to an air filter and an intake system. Background Art

[0002] Gasoline engines, such as those in cars and motorcycles, draw in large quantities of air during operation. If this air is not filtered, suspended dust and impurities can be drawn into the cylinders, accelerating wear on the piston assembly and cylinders. Larger particles, in particular, can enter the area between the piston and cylinder with the air, causing severe "cylinder scuffing," which is particularly severe in dry, dusty driving environments.

[0003] In order to solve the above problems, an air filter is usually installed at the intake end of the engine. The air filter is generally installed in front of the carburetor or throttle to filter out dust and sand in the air and protect the engine cylinder, piston and piston ring from wear by abrasive particles.

[0004] In recent years, with the prevalence of motorcycle travel culture and the surge in motorcycle exports, the operating environment of motorcycles has changed significantly, especially in dry and dusty working environments. The service life of air filters has been greatly shortened, resulting in a decline in user experience. Summary of the Invention

[0005] The purpose of the utility model is to provide an air filter and an air intake system, which can extend the service life of the filter element.

[0006] The utility model provides an air filter having the following characteristics, including: a box body, having an air outlet cavity, a box cover, installed on the box body and having: a cover, containing an air inlet portion and an air outlet portion arranged adjacent to each other; a filter element, installed on the cover; and an end cover, installed on the air inlet portion, having a main air inlet port, and forming an air inlet cavity between the end cover and the air inlet portion; wherein, a partition portion is further provided inside the end cover for dividing the air inlet cavity into an outer air inlet cavity and an inner air inlet cavity, the filter element is placed in the inner air inlet cavity, the outer air inlet cavity has an air inlet flow channel formed around the partition portion, and at least a portion of the gas entering the outer air inlet cavity from the main air inlet port enters the inner air inlet cavity along the air inlet flow channel.

[0007] The air filter provided by the present invention may also have the following features: an air intake guide tube is installed on the partition, and the air intake guide tube has an air intake end extending into the outer air intake cavity and an air outlet end extending into the inner air intake cavity; part of the gas entering from the main air inlet directly enters the air intake end, and part enters the air intake end along the intake flow channel.

[0008] The air filter provided by the present invention may also have the following features: wherein the end cover is located on the inner side of the main air inlet and is provided with a guide plate to guide the gas into the intake flow duct, and the end cover is located on the outer side of the main air inlet and is provided with a guide baffle.

[0009] The air filter provided by the present invention may also have the following features: the intake air duct is an annular channel, having an air inlet located obliquely below the main air inlet, a corner for changing the direction of the airflow, and an air outlet located above the partition; the end cover is provided with a dust exhaust port downstream of the guide plate, and the dust exhaust port is located at the corner.

[0010] The air filter provided by the present invention may also have the following features: the air inlet portion is in the shape of a plate, the end cover and the air outlet portion are both in the shape of a cover, the end cover is arranged above the air inlet portion, and the end cover and the cover have matching shapes, and the air outlet portion has an inner cavity that forms an integral part with the air outlet cavity.

[0011] The air filter provided by the present invention may also have the following features: the air outlet portion includes a partition separating the inner cavity from the air inlet cavity, a positioning block is formed on the side of the partition facing the partition, and a positioning plate that cooperates with the positioning block is formed on the side of the partition facing the partition, and an intake air flow channel is formed between the outer periphery of the partition, the partition and the inner wall of the end cover; a mounting hole is opened on the side of the partition facing the main air inlet, the air intake guide pipe is fixed on the mounting hole, and a slot is formed on the outer peripheral wall of the air intake guide pipe for the edge of the mounting hole to be inserted.

[0012] The air filter provided by the present invention may also have the following features: the air inlet portion is provided with a mounting port, the filter element includes a paper filter element body and a sealing ring, and the paper filter element body is installed on the inner ring of the sealing ring; the partition portion has an opening adapted to the sealing ring, and the sealing ring is pressed onto the mounting port through the opening.

[0013] The air filter provided by the present invention may also have the following features: the cover and the box body are formed into one piece by welding, a fixing hole is provided on the air intake part, a fixing column is provided on the inner side of the main air intake on the end cover, and a fixing pit is provided along the length direction of the fixing column, and the end cover is fixed to the air intake part by a fixing piece passing through the fixing pit.

[0014] The air filter provided by the present invention may also have the following features: a positioning groove is formed between the inner wall of the cover and the fixing column, and a positioning block is formed on the side of the air inlet located at the fixing hole and protrudes toward the side where the end cover is located, which can be embedded in the positioning groove.

[0015] The utility model also proposes an intake system having the following characteristics, including: an air filter, a ventilation duct installed on the air filter, wherein the air filter is the air filter as described above, and the ventilation duct includes an engine intake hose installed on the box body and leading to the air outlet cavity.

[0016] Functions and effects of utility models

[0017] According to the air filter and air intake system involved in the present invention, since a partition is provided in the end cover, the air intake cavity is divided into an outer air intake cavity and an inner air intake cavity, the filter element is installed on the inner air intake cavity and the air intake portion, and an intake flow path is formed around the outer periphery of the partition portion. Part of the gas entering the outer air intake cavity from the main air inlet, especially the air carrying larger dust and impurities will first travel along the intake flow path, around the partition portion and then enter the inner air intake cavity. During the travel, these larger dust and impurities will remain in the outer air intake cavity, so that this part of the gas can be preliminarily filtered, thereby reducing the pressure of subsequent filter element filtration, extending the service life of the filter element, and improving the filtering effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of the air intake system in an embodiment of the present utility model.

[0019] Figure 2 It is a three-dimensional diagram of the air filter in the embodiment of the present utility model.

[0020] Figure 3 It is a three-dimensional diagram of the cover in the embodiment of the present utility model.

[0021] Figure 4 This is one of the cross-sectional views of the air filter in the embodiment of the present utility model.

[0022] Figure 5 This is the second cross-sectional view of the air filter in the embodiment of the present utility model.

[0023] Figure 6 This is one of the structural exploded views of the air filter in the embodiment of the present utility model.

[0024] Figure 7 This is the second structural exploded view of the air filter in the embodiment of the present utility model.

[0025] Figure 8 This is one of the structural diagrams of the end cover in the embodiment of the present utility model.

[0026] Figure 9 This is the second schematic structural diagram of the end cover in the embodiment of the present utility model.

[0027] Figure 10 It is a structural diagram of the air intake guide pipe in an embodiment of the present utility model.

[0028] Figure 11 yes Figure 5 A partial enlarged view of point B.

[0029] Figure 12 yes Figure 4 A partial enlarged view of point A.

[0030] Reference numerals: air filter 100, housing 10, air outlet cavity 11, main air outlet 12, ridge 13, groove 14, connection 15, housing cover 20, cover 30, air inlet 31, mounting opening 311, fixing hole 312, protrusion 313, positioning insert 314, air outlet 32, inner cavity 321, partition 322, positioning plate 323, fillet 33, filter element 40, filter element body 41, sealing ring 42, end cap 50, main air inlet 51, air inlet cavity 52, outer air inlet cavity 52 1. Inner air intake cavity 522, air intake duct 523, air inlet 5231, air outlet 5232, partition 53, mounting hole 531, positioning block 532, side panel 533, opening 534, guide plate 54, guide baffle 55, dust exhaust port 56, fixing column 57, fixing pit 571, positioning groove 58, air intake guide tube 60, air inlet end 61, air outlet end 62, slot 63, spacer 64, rib 65, rib 66, fixing member 71, nut insert 72, gasket 73. DETAILED DESCRIPTION

[0031] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the air filter and intake system of the present invention are described in detail below with reference to the embodiments and drawings.

[0032] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] <Example>

[0034] This embodiment provides an air intake system for a vehicle, in particular, an air intake system for a motorcycle, through which air enters the engine cylinder of the motorcycle.

[0035] Figure 1 It is a perspective view of the air intake system in this embodiment.

[0036] Among them, such as Figure 1 As shown, the air intake system includes an air filter 100 and a ventilation duct. The air filter 100 is used to filter the air before it enters the engine cylinder, so that the air entering the engine cylinder is cleaner; the ventilation duct includes an engine air intake hose 200 installed on the air filter box and leading to the air outlet cavity of the air filter.

[0037] Figure 2 1 is a perspective view of the air filter in this embodiment. Figure 3 1 is a perspective view of the cover in this embodiment, Figure 4 and Figure 5 1 is a cross-sectional view of the air filter in this embodiment.

[0038] like Figure 2-Figure 5 As shown, the air filter 100 includes a housing 10 and a housing cover 20. The housing 10 has an air outlet cavity 11 and a main air outlet 12. The open end (inlet end) of the air outlet cavity 11 is covered with the housing cover 20, and the engine air intake hose 200 is installed at the main air outlet 12. The housing cover 20 is installed on the housing 10 and has a cover 30, a filter element 40 and an end cap 50. The cover 30 is provided on the upper open end of the housing 20 and contains an air inlet portion 31 and an air outlet portion 32 arranged adjacent to each other. The air inlet portion 31 is in the shape of a flat plate, and the air outlet portion 32 is an integrally formed structure on the side of the air inlet portion 31 and arched upward to form a shell-like structure. The air outlet portion 32 has an inner cavity 321 that is combined with the air outlet cavity 11.

[0039] like Figure 4 and Figure 5 As shown, the filter element 40 is installed on the air inlet portion 31, and the end cover 50 is in the shape of a cover, which is installed above the flat air inlet portion 31. The shape of the end cover 50 is compatible with the shape of the air outlet portion 32, and the two appearances can be combined to form a whole. A main air inlet 51 is opened on one side of the end cover 50, and an air inlet cavity 52 is formed between the inner wall of the end cover 50 and the air inlet portion 31. The air outlet portion 32 is also in the shape of a cover. The side of the air outlet portion 32 facing the air inlet portion 31 is formed with a partition 322 that separates the air inlet cavity 52 from the inner cavity 321. When the end cover 50 is installed on the air inlet portion 31, the partition 322 serves as the boundary, and the left and right sides are the air inlet cavity 52 and the inner cavity 321 respectively. The gas enters from the air inlet chamber 52, and then enters the air outlet chamber 11 after being filtered by the filter element 40. Since the inner cavity 321 is combined with the air outlet chamber 11, the gas entering the air outlet chamber 11 will also be distributed in the inner cavity 321. The setting of the inner cavity 321 increases the post-filtration space (the space where the gas enters after filtration), thereby improving the engine's intake volume and intake efficiency.

[0040] The end cap 50 is further provided with a partition 53 inside, which separates the air inlet cavity 52 into an outer air inlet cavity 521 and an inner air inlet cavity 522. The filter element 40 is placed in the inner air inlet cavity 522. An air inlet guide tube 60 is mounted on the partition 53. The air inlet guide tube 60 has an air inlet end 61 extending into the outer air inlet cavity 521 and an air outlet end 62 extending into the inner air inlet cavity 522. The air outlet end 62 is bent toward the location of the filter element 40, so that after exiting the air outlet end 62, the gas can be guided toward the side where the filter element 40 is located. The outer air inlet cavity 521 has an air inlet flow channel 523 formed around the partition. The air inlet flow channel 523 is formed between the outer periphery of the partition 53, the side of the partition plate 322 facing the partition 53, and the inner wall of the end cap 50. In this embodiment, the intake flow channel 523 is an annular channel formed around the partition 53, and contains at least one corner. At least part of the gas entering from the main air inlet 51 will follow the intake flow channel 523 around the outer periphery of the partition 53 into the intake end 61, and then enter the inner air intake cavity 522 and the filter element 40 from the intake guide pipe 60.

[0041] Figure 6 and Figure 7 It is the structural exploded view of the air filter in this embodiment. Figure 8 and Figure 9 1 is a simplified structural diagram of the end cover in this embodiment.

[0042] like Figure 4 As shown, part of the lighter gas (with less dust and impurities) entering from the main air inlet 51 will be directly sucked into the air inlet end 61 ( Figure 4 The flow direction is shown by the hollow arrow), and some heavier gases (carrying larger and heavier dust or impurities) will flow along the inlet flow channel 523 around the outer periphery of the partition 53 and enter the inlet end 61 ( Figure 4 The gas passing through the intake airflow channel 523 flows in a long direction and has a corner where the airflow changes direction. Therefore, during this process, larger and heavier dust or impurities carried in the gas will gradually fall out, which is equivalent to a preliminary filtration of the gas entering the intake guide pipe 60. This preliminary filtration can filter out larger and heavier impurities, so that the gas subsequently entering the filter element has relatively fewer impurities, thereby protecting and extending the service life of the filter element.

[0043] like Figure 4 、 Figure 8 and Figure 9As shown, the intake airflow channel 523 is an annular channel formed around the partition 53, comprising an air inlet 5231 located obliquely below the main air inlet 51, a corner for changing the direction of airflow, and an air outlet 5232 located above. A first airflow channel is formed between the bottom of the partition 53 and the inner wall of the end cap 50, a second airflow channel is formed between the side of the partition 53 and the baffle 322, and a third airflow channel is formed between the top of the partition 53 and the inner wall of the end cap 50. Since the partition 53 in this embodiment is rectangular, the intake airflow channel 523 formed around it is also generally rectangular. Corners are formed between the first and second airflow channels and between the second and third airflow channels. The corner between the first and second airflow channels is located at the lowest end, while the corner between the second and third airflow channels is located at the highest end. The end of the first airflow channel facing the main air inlet 51 has the air inlet 5231, and the end of the third airflow channel facing the main air inlet 51 has the air outlet 5232. The gas enters from the gas inlet 5231 , passes through the first flow channel, the second flow channel, and the third flow channel in sequence, and then flows out from the gas outlet 5232 .

[0044] In practice, the partition 53 may also have a regular or irregular shape, such as a circle, semicircle, ellipse, or polygon. The intake airflow channel 523 is formed around the partition 53 and thus also has a shape that matches the partition 53, such as a circle, polygon, or serpentine channel. The intake airflow channel 523 has at least two flow channels with different directions and a bend between the two flow channels, allowing the airflow to be diverted at the bend.

[0045] The end cover 50 is provided with a guide piece 54 at the inner side of the main air inlet 51 to guide the gas into the air inlet 5231 of the air inlet channel 523. Figure 8 and Figure 9 As shown, the guide vane 54 is curved and bends toward the air inlet 5231 below the intake duct 523. This allows the gas entering from the main air inlet 51 to be guided to the air inlet 5231 and into the intake duct 523. The gas then flows along the outer circumference of the partition 53, flows out through the air outlet 5232, and then enters the intake duct 60. The end cover 50 is provided with a guide baffle 55 located outside the main air inlet 51. The guide baffle 55 is L-shaped. On the one hand, it guides external air to enter the main air inlet 51, and on the other hand, it helps to concentrate the external air and increase the flow rate of gas entering from the main air inlet 51.

[0046] The end cover 50 is provided with a dust exhaust port 56 downstream of the guide plate 54, and the dust exhaust port 56 is located at the lower corner of the inlet flow channel 523 (and the corner between the first flow channel and the second flow channel). The corner is basically at the lowest point of the entire end cover 50. Among the gases entering from the main air inlet 51, some gases carrying larger and heavier impurities will enter the inlet flow channel 523 from the air inlet 5231 under the guidance of the guide plate 54. During the circulation of the gas in the inlet flow channel 513, the impurities will fall down due to inertia or due to collision with the side wall of the partition 53, the inner wall of the end cover 50, etc., and fall out from the dust exhaust port 56, which can prevent dust and impurities from accumulating in the end cover 50 for a long time. The dust exhaust port 56 is set at the turning point. On the one hand, this is the lowest point of the entire air flow channel, which is convenient for impurities and dust to fall out; on the other hand, this is also the turning point of the air flow channel. When the gas flows through the turning point, it collides with the inner wall of the end cover 50 to achieve the turning point, and the dust and impurities carried during the collision are more likely to fall off.

[0047] Figure 10 2 is a structural diagram of the air intake guide tube in this embodiment.

[0048] like Figure 7 As shown, a mounting hole 531 is provided on one side of the partition 53 facing the main air inlet 51, and the air inlet guide pipe 60 is fixed on the mounting hole 531. Figure 10 As shown, the outer wall of the intake duct 60 is formed with a slot 63 into which the edge of the mounting hole 531 snaps. The slot 63 snaps into the edge of the mounting hole 531, thereby mounting the intake duct 60 on the partition 53. The front end of the intake duct 60 forms an intake end 61, and the rear end bends downward (toward the location of the filter element 40) to form an intake end 62. The bent configuration of the intake end 62 guides the gas, allowing it to flow more concentratedly and quickly into the filter element 40 for filtration. The intake duct 60 is also provided with a spacer 64 along its length. Corresponding to the position of the spacer 64, a protruding rib 65 is provided on the outer wall of the intake duct. Furthermore, a number of protruding ribs 66 are provided on the outer wall, arranged perpendicular to the rib 65, to enhance the structural stability of the intake duct.

[0049] Figure 11 It is an enlarged view of the matching structure between the partition and the filter element in this embodiment.

[0050] like Figure 6 、 Figure 7 and Figure 11As shown, a positioning block 532 is formed on the side of the partition 53 facing the partition 322, and a positioning plate 323 is formed on the side of the partition 322 facing the partition 53 to cooperate with the positioning block 532. An inlet airflow channel 523 is formed between the outer periphery of the partition 53, the partition 322, and the inner wall of the end cover 50. The positioning plate 323 is pressed above the positioning block 532 or embedded in the positioning block 532, and can position and limit the end cover 50 in this direction.

[0051] In this embodiment, if Figure 6 As shown, the filter element 40 includes a paper filter element body 41 and a sealing ring 42. The filter element body 41 is fixedly mounted on the inner ring of the sealing ring 42. The air inlet 31 is provided with a mounting opening 311 whose shape matches the sealing ring 42. The sealing ring 42 is mounted at the mounting opening 311. Figure 8 As shown, the side plate 533 of the partition 53 facing the filter element 40 is provided with an opening 534 in the middle thereof, which is adapted to the sealing ring 42. The opening 534 corresponds to the inner air inlet cavity 522, and the edge of the opening 534 is pressed above the sealing ring 42. The opening edge at the bottom of the partition 53 and the edge of the mounting opening 311 on the air inlet 31 limit the upper and lower positions of the sealing ring 42, so that the sealing ring 42 can be pressed tightly between the partition 53 and the air inlet 31. Specifically, as shown in FIG. Figure 11 As shown, the edge of the installation opening 311 is stepped, and the cross-section of the sealing ring 42 also forms a corresponding stepped shape during the pressing process, allowing the two to be tightly fixed together, thereby enhancing the sealing and stability of the structure. In this embodiment, the filter element body 41 is made of dry paper filter material, and the sealing ring 42 is made of polyurethane foam, which facilitates installation and sealing.

[0052] In actual production, the cover 30 and the box body 10 are formed into one piece by welding. Specifically, Figure 6 As shown, the opening edge above the box body 11 is formed with two protruding edges 13 protruding toward the side where the cover 30 is located, and a groove 14 is provided between the two protruding edges 13. The opening edge below the cover 30 is folded outward to form a fillet 33 adapted to the groove 14. The fillet 33 is first embedded in the groove 14, and then the cover 30 and the box body 10 are fixedly connected to form a whole by welding. A wrapping structure is formed between the groove 14 and the fillet 33, and the entire structure is more tightly sealed.

[0053] Figure 12 It is an enlarged view of the fixing point between the end cover and the air inlet portion of this embodiment.

[0054] In order to facilitate maintenance and replacement of the filter element 40, the end cover 50 is detachably arranged on the air inlet portion 31. Figure 6 As shown, the air inlet portion 31 is provided with a fixing hole 312 near the air inlet 51. The fixing hole 312 is a blind hole with a closed bottom end. Figure 7As shown, on the reverse side of the air inlet portion 31 corresponding to the fixing hole 312, a protrusion 313 is formed, and the fixing hole 312 is provided in the protrusion 313. Figure 7-Figure 9 As shown, a fixing post 57 is provided on the inner side of the main air inlet 51 of the end cover 50. This fixing post 57 has a fixing recess 571 defined along its length. A fixing member 71 passes through the fixing recess 571 to secure the end cover 50 to the fixing hole 312. Furthermore, a positioning groove 58 is formed between the inner wall of the cover 50 and the fixing post 57. A positioning insert 314 is formed on the side of the air inlet portion 31 located in the fixing hole 312, projecting toward the side of the end cover 50. The fixing member 71 can be a screw or bolt. To ensure a tight connection, a nut insert 72 and a washer 73 can be added to the end of the fixing member 71.

[0055] The end cap 50 and the air inlet 31 are locked together only by a single fastener 71, and only one fastener 71 is required. This reduces the number of components, results in a simple and reliable structure, and makes disassembly very convenient and quick. Furthermore, the connection between the end cap 50 and the air inlet 31 is formed as a fastening post 57 and a protrusion 313, with internal openings. This allows the fastener mounting structure to be sealed relative to the air inlet cavity 52 and the air outlet cavity 11, preventing corrosion and other issues caused by prolonged exposure of the fastener to air.

[0056] In order to enhance the overall structural strength, the box body 10 and the cover 30 are provided with reinforcing ribs at multiple locations, such as Figure 7 As shown, the cover 30 has a plurality of crisscross reinforcing ribs 315 on the reverse side of the air inlet 31. The bottom and surrounding of the box body 10 are provided with a plurality of connecting parts 15, which are not only provided with corresponding mounting holes, but also provided with reinforcing ribs.

[0057] The gas flow direction of the air filter of this embodiment when working is as follows:

[0058] like Figure 4 As shown, the dirty air enters the outer air inlet cavity 521 from the main air inlet 51 through the guide plate 54 under the action of negative pressure and is divided, wherein a part of the air with sand and dust moves downward ( Figure 4 The dust is separated by inertia and discharged from the dust outlet 56 located at the lower part. The air with fine dust continues to flow back to the air inlet end 61 of the air inlet duct 60 through the peripheral channel (intake air channel 523) formed by the partition 53 in the end cover 50 and enters the air inlet duct 60. The other part of the dust and air with lighter mass is directly sucked into the air inlet duct 60 at the rear end of the guide plate 54 ( Figure 4 The hollow arrows indicate the flow direction).

[0059] like Figure 5 As shown, the gas entering the air inlet guide tube 60 flows into the inner air inlet cavity 522 along the air outlet end 62, enters the filter element 40 for further filtration, then enters the air outlet cavity 11 and the inner cavity 321, and is finally discharged from the main air outlet 12.

[0060] Functions and effects of this embodiment

[0061] According to the air filter and air intake system proposed in the above embodiment, when working, dirty air will be diverted from the main air inlet 51 through the guide plate 54 under the action of negative pressure, and a part of the air with sand and dust will move downward. Under the action of inertia, the sand and dust will be separated and discharged from the dust outlet 56. The air with fine dust will flow back to the air intake duct 60 through the peripheral channel (intake air duct 523) formed by the partition 53 in the end cover 50, while the other part of the dust and air with lighter mass will be directly sucked into the air intake duct 60 at the rear end of the guide plate 54, so that the gas will undergo a preliminary filtration before entering the filter element 40, and the dust impurities with large mass will be filtered out first and discharged from the dust outlet 56, and then undergo a secondary filtration by the filter element 40. On the one hand, it can improve the filtering effect, and on the other hand, it can reduce the difficulty of filtering the filter element, thereby increasing the service life of the filter element 40.

[0062] Furthermore, in the above embodiment, the cover 30 is configured with half of it being a flat-plate-type air inlet portion 31 and the other half being a shell-shaped air outlet portion 32, and the two are adjacently arranged, so that the end cover 50 can form a whole with the air outlet portion 32 after being covered on the air inlet portion 31, and the structure is more compact. On the other hand, the inner cavity 321 of the air outlet portion 32 is combined with the air outlet cavity 11, so that the post-filtration space of the gas is increased, which can accommodate more clean gas and increase the supply of engine gas.

[0063] Furthermore, in the above embodiment, the end cover 50 and the air inlet portion 31 are fixedly installed by only one fixing member, and disassembly and installation are very convenient and quick, and the end cover 50 is positioned and limited with the partition 322 of the air outlet portion 32 by its internal partition 53, so that it can cooperate with the fixing member to strengthen the firmness of the installation between the end cover 50 and the air inlet portion 31.

[0064] The above embodiments are merely preferred embodiments of the present invention and do not limit the scope of patent protection of the present invention. Any equivalent unit transformations made using the contents of the present invention specification and drawings, directly or indirectly used in other related technical fields, are also included in the scope of protection of the present invention.

Claims

1. An air filter, characterized in that: include: The box body has an air outlet cavity, A box cover is mounted on the box body and has: a cover including an air inlet portion and an air outlet portion arranged adjacent to each other; a filter element mounted on the cover; and an end cover, mounted on the air inlet portion, having a main air inlet and forming an air inlet cavity between the end cover and the air inlet portion; In which, a partition is also provided inside the end cover to divide the air inlet cavity into an outer air inlet cavity and an inner air inlet cavity. The filter element is placed in the inner air inlet cavity. The outer air inlet cavity has an inlet flow channel formed around the partition. At least part of the gas entering the outer air inlet cavity from the main air inlet port enters the inner air inlet cavity along the inlet flow channel.

2. The air filter according to claim 1, characterized in that in, An air intake guide pipe is installed on the partition, and the air intake guide pipe has an air intake end extending into the outer air intake cavity and an air outlet end extending into the inner air intake cavity; part of the gas entering from the main air inlet directly enters the air intake end, and part enters the air intake end along the air intake flow channel.

3. The air filter according to claim 2, characterized in that in, The end cover is located on the inner side of the main air inlet and is provided with a guide plate for guiding the gas into the inlet flow channel. The end cover is located on the outer side of the main air inlet and is provided with a guide baffle.

4. The air filter according to claim 3, characterized in that in, The inlet air duct is an annular channel having an air inlet located obliquely below the main air inlet, a corner for changing the direction of the airflow, and an air outlet located above the partition. The end cover is provided with a dust exhaust port downstream of the guide plate, and the dust exhaust port is located at the corner.

5. The air filter according to claim 2, characterized in that in, The air inlet portion is in a plate shape, the end cover and the air outlet portion are both in a shell shape, the end cover is arranged above the air inlet portion, and the end cover and the shell have matching shapes, and the air outlet portion has an inner cavity that forms an integral part with the air outlet cavity.

6. The air filter according to claim 5, characterized in that in, The air outlet portion includes a partition separating the inner cavity from the air inlet cavity, a positioning block is formed on the side of the partition facing the partition, and a positioning plate is formed on the side of the partition facing the partition to cooperate with the positioning block, and the inlet flow channel is formed between the outer periphery of the partition, the partition, and the inner wall of the end cover; A mounting hole is formed on a side of the partition facing the main air inlet, the air intake guide tube is fixed on the mounting hole, and a slot for the edge of the mounting hole to be inserted is formed on the outer peripheral wall of the air intake guide tube.

7. The air filter according to claim 6, characterized in that in, The air inlet portion is provided with a mounting port, and the filter element comprises a paper filter element body and a sealing ring, wherein the paper filter element body is mounted on the inner ring of the sealing ring; The partition portion has an opening adapted to the sealing ring, and the sealing ring is pressed onto the installation opening through the opening.

8. The air filter according to any one of claims 1 to 7, characterized in that: in, The cover and the box body are formed into one body by welding, a fixing hole is provided on the air inlet part, and a fixing column is provided on the end cover on the inner side of the main air inlet. The fixing column has a fixing pit along its length direction, and the end cover is fixed to the fixing hole by a fixing piece passing through the fixing pit.

9. The air filter according to claim 8, characterized in that in, A positioning groove is formed between the inner wall of the cover and the fixing column, and a positioning block which can be embedded in the positioning groove is formed on one side of the air inlet portion located at the fixing hole and protrudes toward the side where the end cover is located.

10. An air intake system, characterized in that: include: Air filter, A ventilation duct is installed on the air filter. Wherein, the air filter is the air filter according to any one of claims 1 to 9, and the ventilation duct includes an engine air intake hose installed on the box body and leading to the air outlet cavity.

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