CN220815850U - Filter assembly - Google Patents

Abstract

The present application provides a filter assembly, which includes a shell and a filter body, the filter body includes a plurality of cyclone filter units and a central air outlet, air can enter from the side of the shell, flow through the cyclone filter unit, and then flow out from the central air outlet, the cyclone filter unit includes three groups of cyclone filters, including A, B and C cyclone filter units respectively, C is smaller than A and B, the size of the shell in the first direction is smaller than the size in the second direction, in the first direction, the first and second groups of cyclone filters are respectively located on both sides of the central air outlet, the third group of cyclone filters is located between the first and second groups of cyclone filters, in the second direction, the third group of cyclone filters is at least distributed on both sides of the central air outlet, and the first and second groups of cyclone filters are respectively arranged in a row in the second direction. The filter assembly according to the present application has a simple structure, and can integrate more cyclone filters in a small space to improve the filtering effect.

Description

Filter assembly

Technical Field

The present application relates to the field of filters, and more particularly to a filter assembly.

Background technique

For example, engineering vehicles may be operated in construction sites or open-pit coal mines, where the ambient air contains a large amount of dust, which can easily cause the vehicle's engine air intake system to become blocked, resulting in reduced engine efficiency and increased fuel consumption. To solve the above problem, a cyclone filter (usually used as a pre-filter) can be provided for the vehicle's engine air intake system.

The applicant of the present application has proposed two variable flow filters in patent application CN113153588A and patent CN115342008B. Such filters can spontaneously adjust the cross-sectional area of the airflow according to the flow rate of the fluid and thus adjust the flow rate of the fluid. The centrifugal force they provide is large and they show good separation effect in experiments.

However, how to integrate similar cyclone filters into application devices to provide powerful air filtration (pre-filtration) capabilities in a small size is still a topic that needs to be explored in the art.

Utility Model Content

The purpose of the present application is to overcome or at least alleviate the deficiencies of the above-mentioned prior art and to provide a.

The present application provides a filter assembly, comprising a housing and a filter body disposed in the housing, wherein the filter body comprises a plurality of cyclone filter units and a central air outlet cylinder, air can enter from the side of the housing, flow through the cyclone filter units, and then flow out from the central air outlet cylinder, wherein:

The plurality of cyclone filter units are divided into a first group of cyclone filters, a second group of cyclone filters and a third group of cyclone filters, the first group of cyclone filters includes A cyclone filter units, the second group of cyclone filters includes B cyclone filter units, the third group of cyclone filters includes C cyclone filter units, C is smaller than A, and C is smaller than B,

The size of the housing in the first direction is smaller than the size in the second direction,

In the first direction, the first group of cyclone filters and the second group of cyclone filters are respectively located on both sides of the central air outlet cylinder, and the third group of cyclone filters is located between the first group of cyclone filters and the second group of cyclone filters.

In the second direction, the plurality of cyclone filter units belonging to the third group of cyclone filters are distributed at least on both sides of the central air outlet tube.

The first group of cyclone filters and the second group of cyclone filters are respectively arranged in a row in the second direction.

In at least one embodiment, the openings of the inlet cylinders for air intake of the plurality of the cyclone filter units belonging to the first group of cyclone filters and the second group of cyclone filters are opened along the first direction away from the central air outlet cylinder.

In at least one embodiment, openings of the inlet cylinders for air intake of the plurality of cyclone filter units belonging to the third group of cyclone filters are opened along the second direction in a direction away from the central air outlet cylinder.

In at least one embodiment, A=B=4.

In at least one embodiment, C=2, and in the second direction, the two cyclone filter units belonging to the third group of cyclone filters are respectively arranged on both sides of the central air outlet tube.

In at least one embodiment, the housing includes a plurality of air inlet holes for allowing gas to flow in, and the air inlet holes are formed at least on side walls of the housing on both sides in the first direction.

In at least one embodiment, the housing further comprises a housing gas outlet located at the bottom, and the housing gas outlet is docked with the central gas outlet.

In at least one embodiment, a plurality of dust outlets are formed at the bottom of the housing, and a dust collecting barrel for collecting dust of each cyclone filter unit is docked with one of the dust outlets.

In at least one embodiment, the filter assembly further includes at least two dust boxes, which are arranged around the air outlet of the housing, and each of the dust boxes is connected to a plurality of the dust outlets.

In at least one embodiment, the dust box is formed with a recess, and the recess is arranged on the outer peripheral side of the outer shell outlet in a shape similar to that of the outer shell outlet, so that each dust box can partially surround the outer shell outlet.

In at least one embodiment, there are two dust collecting boxes, and the two dust collecting boxes are arranged opposite to each other in the second direction.

In at least one embodiment, the dust box can be installed on or removed from the housing in a push-pull manner in the second direction.

In at least one embodiment, a locking groove is formed at the center of the bottom of the housing in the second direction, and a first fixing portion is formed on the dust collecting box, and the first fixing portion can be partially inserted into the locking groove to be fixed.

In at least one embodiment, at least two opposite guide bars are provided on both sides of the bottom of the housing in the first direction, and a distance between the two opposite guide bars is greater than a width of the dust collecting box in the first direction.

In at least one embodiment, the filter assembly further comprises a movable buckle connected to the housing, the dust box is formed with a second fixing portion, and the movable buckle can cooperate with the second fixing portion to fix the dust box to the housing.

In at least one embodiment, the filter body further includes a base plate, the central air outlet cylinder and the inner cylinder of the cyclone filter unit are both formed on the base plate, and the outer cylinder of the cyclone filter unit is detachably connected to the base plate.

In at least one embodiment, the filter assembly further includes an upper cover, wherein the upper cover is mounted on the base plate, and a space inside the upper cover communicates with the central air outlet cylinder and the inner cylinder.

In at least one embodiment, a plurality of inner baffles are formed in the upper cover, and an opening of the inner cylinder is correspondingly accommodated between adjacent inner baffles.

In at least one embodiment, the cyclone filter unit includes a valve plate, which is installed at the opening of the inlet tube of the cyclone filter unit for air intake, and the valve plate can adjust the angle between itself and the inlet tube according to the air intake volume.

The filter assembly according to the present application has a simple structure and can integrate more cyclone filters in a small space, thereby improving the filtering effect.

BRIEF DESCRIPTION OF THE DRAWINGS

1 and 2 are schematic structural diagrams of a filter assembly according to an embodiment of the present application at different viewing angles.

FIG. 3 is a cross-sectional view of FIG. 1 .

FIG. 4 is an exploded schematic diagram of a filter assembly according to an embodiment of the present application.

5 and 6 are exploded schematic views of a partial structure of a filter assembly according to an embodiment of the present application.

FIG. 7 is a schematic diagram showing the filter assembly cut apart at the upper cover portion along an axis perpendicular to the central air outlet cylinder.

FIG. 8 is a schematic diagram of a partial structure of a filter assembly according to an embodiment of the present application.

FIG. 9 is a partially exploded schematic diagram of FIG. 8 .

FIG. 10 is a partially exploded schematic diagram of a filter body of a filter assembly according to an embodiment of the present application.

FIG. 11 is a schematic diagram of a substrate of a filter assembly according to an embodiment of the present application.

Description of reference numerals:

10 housing; 11 air inlet; 12 dust outlet; 13 housing air outlet; 14 guide strip; 15 lock slot;

20 upper cover; 21 inner partition;

30 filter body; 31 substrate; 310 plate body; 311 inner cylinder; 312 central air outlet;

300 cyclone filter unit; 301 inlet cylinder; 302 dust collecting cylinder; 303 outer cylinder; 304 valve plate;

40 dust box; 41 first fixing portion; 42 second fixing portion; 43 recessed portion;

P connecting tube; L movable buckle; A1 first direction; A2 second direction.

Detailed ways

The exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, and are not intended to exhaust all possible methods of the present application, nor to limit the scope of the present application.

1 to 9 , a filter assembly according to one embodiment of the present application is introduced.

The filter assembly according to the present application includes a housing 10 , an upper cover 20 , a filter body 30 , a dust collecting box 40 , a connecting tube P and a movable buckle L.

The main body of the housing 10 is substantially in the shape of a square box, with an open upper portion for mounting the filter main body 30 .

The filter body 30 includes a base plate 31 and a plurality of (10 in this embodiment) cyclone filter units 300. Referring to Figures 4, 10 and 11, the base plate 31 includes a plate body 310, a central air outlet cylinder 312 located in the center of the plate body, and a plurality of inner cylinders 311 surrounding the central air outlet cylinder 312. The inner cylinder 311 is a part of the cyclone filter unit 300, and the outer cylinder 303 of each cyclone filter unit 300 is sleeved outside an inner cylinder 311 (the outer cylinder 303 is fixed to the plate body 310 by screws, for example), forming a complete cyclone filter unit 300.

The filter body 30 is installed in the housing 10, or more precisely, the cyclone filter unit 300 and the central air outlet cylinder 312 of the filter body 30 extend into the housing 10, and the plate body 310 is mounted on the opening above the housing 10. Optionally, the plate body 310 is connected to the housing 10 by screws.

The cyclone filter unit 300 used in this application is prior art, for example, reference may be made to patent application CN113153588A or patent CN115342008B previously filed by the applicant of this application. For various purposes, all contents disclosed in these two patents are introduced into this application, and detailed description is omitted.

Each cyclone filter unit 300 includes an inlet tube 301, a dust collecting tube 302, an outer tube 303, an inner tube 311 and a valve plate 304. The valve plate 304 is movably installed at the inlet tube 301. The airflow can drive the valve plate 304 to rotate. Under different airflows, the valve plate 304 can automatically adjust the angle between it and the wall of the inlet tube 301, thereby adjusting the airflow cross-sectional area and further adjusting the flow rate of the fluid. Air can flow into the cyclone filter unit 300 from the inlet tube 301, and then dust and other debris (hereinafter referred to as dust) fall into the dust collecting tube 302 below through cyclonic centrifugal separation, and the filtered clean air flows out from the outer tube 303 above. The filtered air from the outer tubes 303 of multiple cyclone filter units 300 will converge into the central air outlet tube 312 and further flow downstream.

The present application arranges multiple cyclone filter units 300 reasonably on the periphery of the central air outlet 312, so that the entire filter body 30 (or the entire filter assembly) has a smaller volume. Specifically, referring to Figures 5 and 6, the cyclone filter units 300 in this embodiment can be divided into three groups, the first group of cyclone filters I, the second group of cyclone filters II and the third group of cyclone filters III. The first group of cyclone filters I includes 4 cyclone filter units 300, the second group of cyclone filters II includes 4 cyclone filter units 300, and the third group of cyclone filters III includes 2 cyclone filter units 300. In a plane perpendicular to the axis of the central air outlet 312 (hereinafter referred to as the basic plane), a first direction A1 and a second direction A2 perpendicular to each other are defined, and the above three groups of cyclone filters are arranged in three rows at different positions on the first direction A1 and along the second direction A2. In the first direction A1, the first group of cyclone filters I and the second group of cyclone filters II are respectively located on both sides of the central air outlet 312. In the second direction A2 , two cyclone filter units 300 belonging to the third group of cyclone filters III are arranged in two groups on both sides of the central air outlet cylinder 312 .

Extending to a wider range of applications, the first group of cyclone filters I includes A cyclone filter units 300, the second group of cyclone filters II includes B cyclone filter units 300, and the third group of cyclone filters III includes C cyclone filter units 300. Wherein, C is less than A, and C is less than B; preferably, A=B; preferably, A>3 and B>3.

In this embodiment, within the base plane, the size of the matrix formed by the multiple cyclone filter units 300 in the second direction A2 is greater than the size in the first direction A1, so the two opposite faces in the first direction A1 are used as the preferred air intake faces. The openings of the inlet tubes 301 for air intake of the multiple cyclone filter units 300 belonging to the first group of cyclone filters I and the second group of cyclone filters II are opened along the first direction A1 in a direction away from the central air outlet tube 312. The openings of the inlet tubes 301 for air intake of the multiple cyclone filter units 300 belonging to the third group of cyclone filters III are opened along the second direction A2 in a direction away from the central air outlet tube 312. This arrangement not only makes the opening of the inlet tube 301 of each cyclone filter unit 300 open toward the outer peripheral side of the central air outlet tube 312, which is beneficial to air intake; but also the direction of the airflow flowing into the outer casing 10 is relatively uniform, the air intake directions of the first group of cyclone filters I and the second group of cyclone filters II are reversely parallel, and the air intake direction of the third group of cyclone filters III is perpendicular to the first group of cyclone filters I (or the second group of cyclone filters II), and the air intake airflows of each cyclone filter unit 300 are not easy to interfere with each other.

In a plane perpendicular to the axis of the central air outlet 312, the cross section of the housing 10 is roughly rectangular to adapt to the matrix shape formed by the multiple cyclone filter units 300. In addition, in order to adapt to the air intake direction of the multiple cyclone filter units 300, the two walls of the side wall of the housing 10 that are opposite to each other in the first direction A1 are set as air intake walls, and a plurality of air intake holes 11 are opened on the air intake wall, so that the air intake wall is formed into a mesh-like structure. Since the two side walls that are opposite to each other in the second direction A2 face the third group of cyclone filters III, and the number of the third group of cyclone filters III is small, these two side walls do not need to be provided with air intake holes, so that the third group of cyclone filters III also obtains air intake by borrowing the aforementioned air intake wall.

It should be understood that in other possible implementations, air inlet holes may also be provided on two side walls of the housing 10 that are opposite to each other in the second direction A2, so that all four side walls of the housing 10 serve as air inlet walls.

It is worth mentioning that the applicant has proposed in patent CN115342008B a method of arranging multiple cyclone filter units in a circular manner on the periphery of the central air outlet. Compared with this method, the arrangement of multiple cyclone filter units 300 according to the present application can more effectively utilize space and set more cyclone filter units 300 in a limited space.

3 and 5 , in order to match the central air outlet and the dust collecting cylinder on the filter body 30 , the outer shell 10 is provided with an outer shell air outlet 13 and a plurality of dust outlets 12 .

The shell gas outlet cylinder 13 is located at the bottom of the shell 10, and it partially extends into the interior of the shell 10 and partially extends out of the shell 10. The shell gas outlet cylinder 13 and the central gas outlet cylinder 312 can be connected to each other in a nested manner. The part of the shell gas outlet cylinder 13 extending out of the shell inner cavity is used to be connected to the connecting cylinder P to further connect the downstream airway.

The bottom of the dust collecting cylinder 302 of each cyclone filter unit 300 is connected to a dust outlet 12 . For example, the bottom of the dust collecting cylinder 302 passes through the dust outlet 12 to guide dust out of the housing 10 .

3, 6 and 7, an upper cover 20 is provided above the filter body 30, or above the plate body 310. The upper cover 20 is used to define an air passage for the filtered air to flow from the outer cylinder 303 to the central air outlet cylinder 312.

For the convenience of molding and to save materials, the outline of the upper cover 20 on the aforementioned base plane is smaller than the outline of the plate body 310 , and the outline edge of the upper cover 20 only needs to be able to enclose multiple outer cylinders 303 .

Optionally, the upper cover 20 is connected to the board body 310 by screws.

A plurality of inner baffles 21 are formed in the upper cover 20. Referring to FIG. 7 , an outer cylinder 303 is correspondingly accommodated between adjacent inner baffles 21, and the space defined by adjacent inner baffles 21 is connected to the central air outlet 312. Thus, the inner baffles 21 provide flow guidance for the airflow flowing out of each outer cylinder 303, so that the airflows flowing out of the plurality of outer cylinders 303 can flow into the central air outlet 312 with less flow resistance and without affecting each other as much as possible. In addition, the inner baffles 21 are also equivalent to the reinforcing ribs in the upper cover 20, so that the upper cover 20 has greater structural strength.

Next, the arrangement of the dust box 40 will be described with reference to FIG. 6 to FIG. 9 .

In this embodiment, the filter assembly includes two dust boxes 40, and the two dust boxes 40 are arranged around the housing air outlet 13. In the second direction A2, the two dust boxes 40 are arranged opposite to each other. Each dust box 40 is used to collect dust from half of the cyclone filter units 300 among all the cyclone filter units 300, that is, each dust box 40 collects dust from five cyclone filter units 300.

The walls of the two dust boxes 40 facing each other are formed with recesses 43 for accommodating the housing gas outlet 13. The shape of the recess 43 is roughly similar to that of the housing gas outlet 13, that is, the recess 43 is semi-cylindrical, so that each dust box 40 partially surrounds the housing gas outlet 13.

The dust box 40 in this embodiment can be mounted on or removed from the housing 10 in a push-pull manner for reciprocating movement in the second direction A2.

Specifically, two locking grooves 15 are formed in the middle of the second direction A2 at the bottom of the housing 10. Correspondingly, two first fixing portions 41 are formed on the upper edge of the wall of the dust box 40 facing the other dust box 40. The first fixing portion 41 is in a trapezoidal hook shape and has a certain elasticity. The first fixing portion 41 can pass through the locking groove 15 in a slightly elastically deformed manner and restore its original shape, thereby buckling the locking groove 15 to be fixed.

Preferably, the notch of the locking slot 15 is through in the second direction A2, so that each locking slot 15 can provide support for the first fixing portions 41 of the two dust collecting boxes 40 on both sides.

A second fixing portion 42 is formed on the wall of each dust box 40 that is away from the housing air outlet 13 in the second direction A2. A movable buckle L is connected to the housing 10. The movable buckle L can be pulled to close to buckle the second fixing portion 42, or pulled to open to release the second fixing portion 42.

Thus, in the second direction A2 , the dust box 40 can be firmly fixed to the housing 10 by the locking groove 15 and the movable buckle L through the first fixing portion 41 and the second fixing portion 42 .

Preferably, guide bars 14 are formed at two edges at both ends of the bottom of the housing 10 in the first direction A1. In the first direction A1, the distance between the two guide bars 14 is slightly larger than the width of the dust box 40, so that during the pushing, pulling, loading and unloading process of the dust box 40, the guide bars 14 on both sides can abut against the two sides of the dust box 40, providing good guidance for the installation of the dust box 40.

Preferably, at least a portion of the dust box 40 is made of a transparent material, so that the dust collection status inside the dust box 40 can be observed in real time, which is convenient for the operator to clean the dust inside the dust box 40 in time.

The dust box 40 of the present application corresponds to the setting mode of collecting dust of multiple cyclone filter units 300, which, on the one hand, makes the structure of the device simple and the manufacturing cost low; on the other hand, it also makes the cleaning of dust easier. Only one dust box 40 needs to be removed to clean the dust collected by multiple cyclone filter units 300.

In addition, the two dust boxes 40 are arranged relatively around the outer shell outlet 13 in the second direction A2, so that the dust boxes 40 can be loaded and unloaded in a push-pull manner while avoiding the outer shell outlet 13, and the loading and unloading method is simple.

It should be understood that the above-mentioned embodiments and some aspects or features thereof may be appropriately combined.

The present application has at least one of the following advantages:

(i) According to the filter assembly of the present application, multiple cyclone filter units are divided into three groups and surrounded on the periphery of the central air outlet in a more compact manner, so that more cyclone filter units can be integrated in a smaller space, thereby improving the filtering capacity of the filter assembly.

(ii) The air inlet openings of the plurality of cyclone filter units are oriented in a reasonable direction, so that the air flowing into the housing 10 is not easily interfered with each other, and the air intake efficiency is high.

(iii) The inner baffle in the upper cover allocates a reasonable air passage for the airflow out of the cyclone filter unit, so that the filtered airflow is not easily interfered with each other in the process of flowing downstream, and the air resistance is small.

(iv) The base plate of the filter body is detachably connected to the cyclone filter unit, and the central air outlet cylinder and the inner cylinder of the cyclone filter unit are integrated on the plate body, so that the filter body has a simple structure and is easy to install, and the plate body provides installation support for the upper cover.

(v) One dust box 40 collects dust from multiple cyclone filter units 300, and two dust boxes 40 are arranged around the outer shell air outlet 13, so that the dust box 40 has a simple structure, is easy to manufacture, and is convenient to use.

Of course, the present application is not limited to the above-mentioned embodiments. Under the guidance of the present application, those skilled in the art may make various modifications to the above-mentioned embodiments of the present application without departing from the scope of the present application.

Claims (19)

1. A filter assembly comprising a housing (10) and a filter body (30) disposed within the housing (10), the filter body (30) comprising a plurality of cyclone filter units (300) and a central air outlet (312), air being able to enter from a side of the housing (10), flow through the cyclone filter units (300) and exit from the central air outlet (312),

The plurality of cyclone filter units (300) are divided into a first group of cyclone filters (I) including A cyclone filter units (300), a second group of cyclone filters (II) including B cyclone filter units (300), and a third group of cyclone filters (III) including C cyclone filter units (300), C being smaller than A and C being smaller than B,

The dimensions of the housing (10) in the first direction (A1) are smaller than in the second direction (A2),

In the first direction (A1), the first set of cyclone filters (I) and the second set of cyclone filters (II) are respectively positioned at two sides of the central air outlet cylinder (312), the third set of cyclone filters (III) are positioned between the first set of cyclone filters (I) and the second set of cyclone filters (II),

In the second direction (A2), a plurality of cyclone filter units (300) belonging to the third group of cyclone filters (III) are distributed at least on both sides of the central air outlet (312),

The first set of cyclone filters (I) and the second set of cyclone filters (II) are each aligned in the second direction (A2).

2. The filter assembly according to claim 1, wherein openings of inlet barrels (301) for intake air of a plurality of the cyclone filter units (300) belonging to the first set of cyclone filters (I) and the second set of cyclone filters (II) are opened in the first direction (A1) in a direction away from the central outlet barrel (312).

3. The filter assembly according to claim 1, wherein the openings of the inlet barrels (301) for the inlet air of the plurality of cyclone filter units (300) belonging to the third group of cyclone filters (III) open in the second direction (A2) in a direction facing away from the central outlet barrel (312).

4. The filter assembly of claim 1, wherein a = B = 4.

5. The filter assembly according to claim 1, wherein c=2, in the second direction (A2), 2 cyclone filter units (300) belonging to the third group of cyclone filters (III) are respectively arranged on both sides of the central outlet tube (312).

6. A filter assembly according to claim 1, wherein the housing (10) comprises a plurality of inlet holes (11) for inflow of gas, the inlet holes (11) being formed at least in side walls of the housing (10) on both sides in the first direction (A1).

7. The filter assembly of claim 1, wherein the housing (10) further comprises a bottom-located housing outlet (13), the housing outlet (13) interfacing with the central outlet (312).

8. The filter assembly according to claim 7, wherein a plurality of dust outlets (12) are formed at a bottom of the housing (10), and a dust collection tube (302) for collecting dust of each cyclone filter unit (300) is abutted with one of the dust outlets (12).

9. The filter assembly of claim 8, further comprising at least two dust boxes (40), said dust boxes (40) being disposed around said housing outlet (13), each of said dust boxes (40) being in communication with a plurality of said dust outlets (12).

10. The filter assembly according to claim 9, wherein the dust collection boxes (40) are formed with recesses (43), the recesses (43) being provided on the outer peripheral side of the housing outlet tube (13) in a shape similar to the housing outlet tube (13) so that each dust collection box (40) can partially surround the housing outlet tube (13).

11. The filter assembly according to claim 9, wherein the number of dust boxes (40) is two, two of the dust boxes (40) being oppositely arranged in the second direction (A2).

12. The filter assembly according to claim 11, wherein the dust box (40) is slidably mounted to the housing (10) or removable from the housing (10) in the second direction (A2).

13. A filter assembly according to claim 11, wherein the bottom of the housing (10) is formed with a locking groove (15) in the center in the second direction (A2), the dust box (40) is formed with a first fixing portion (41), and the first fixing portion (41) is partially inserted into the locking groove (15) to be fixed.

14. The filter assembly according to claim 11, wherein the bottom of the housing (10) is provided with at least two opposing guide bars (14) on both sides in the first direction (A1), the distance between the two opposing guide bars (14) being larger than the width of the dust box (40) in the first direction (A1).

15. The filter assembly of claim 9, further comprising a removable clasp (L) coupled to the housing (10), the dust box (40) defining a second securing portion (42), the removable clasp (L) being engageable with the second securing portion (42) to secure the dust box (40) to the housing (10).

16. The filter assembly according to claim 1, wherein the filter body (30) further comprises a base plate (31), the central air outlet (312) and the inner tube (311) of the cyclone filter unit (300) are both formed in the base plate (31), and the outer tube (303) of the cyclone filter unit (300) is detachably connected with the base plate (31).

17. The filter assembly of claim 16, further comprising an upper cover (20), the upper cover (20) being mounted to the base plate (31), a space within the upper cover (20) communicating the central outlet (312) and the inner barrel (311).

18. The filter assembly of claim 17, wherein a plurality of inner baffles (21) are formed in the upper cover (20), and adjacent inner baffles (21) are correspondingly provided with openings for accommodating one inner cylinder (311).

19. The filter assembly according to any one of claims 1 to 18, wherein the cyclone filter unit (300) comprises a valve plate (304), the valve plate (304) is mounted at an opening of an inlet cylinder (301) of the cyclone filter unit (300) for inlet air, and the valve plate (304) can adjust an included angle between itself and the inlet cylinder (301) according to the inlet air quantity.