Air filtering device and agricultural equipment

Abstract

The utility model relates to the field of agricultural machinery, and provides an air filtering device and agricultural equipment, one end of a central pipe of a prefilter is inserted into a first shell, a plurality of first rotational flow pipes are arranged, and the plurality of first rotational flow pipes are uniformly distributed around the axis of the central pipe; the filter comprises a second shell and a filter assembly, and the second shell is provided with an air inlet pipe; the other end of the central pipe is inserted into the gas inlet pipe, and gas can enter the first shell, sequentially flows through the first rotational flow pipe and the central pipe, then enters the filter and is filtered by the filtering assembly; the connecting assembly comprises a supporting piece, the air inlet pipe and the center pipe are both inserted into the supporting piece, the supporting piece comprises a sleeving section and a flange section, the flange section is fixed to the second shell, and the sleeving section is fixed to the side, back to the second shell, of the flange section. Therefore, two-stage filtration of gas can be realized, the filtration quality is improved, the service life of a single filtration function piece is prolonged, the relative stability of the two-stage filter can be kept, and the connection position of the two-stage filter is protected.

Description

Technical Field

[0001] The utility model relates to the technical field of agricultural machinery and equipment, in particular to an air filtering device and agricultural machinery and equipment. Background Art

[0002] The loader and harvester industries generally operate in a heavily dusty environment. Currently, they are generally equipped with 93 dust air filters. The maintenance cycle of air filters is short, and the filter elements generally need to be cleaned every day, or even multiple times a day, which seriously affects the vehicle's attendance time and increases the driver's maintenance intensity.

[0003] Therefore, there is an urgent need for an air filtering device and agricultural machinery equipment to solve the above technical problems. Utility Model Content

[0004] The purpose of this utility model is to propose an air filtration device and agricultural machinery equipment, which can achieve double-stage filtration of gas, improve filtration quality, extend the service life of a single filter function part, and maintain the relative stability of the double-stage filter, thereby ensuring the continuous operation time of the agricultural machinery equipment.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] Air filtration device, including:

[0007] A pre-filter, the pre-filter comprising a central tube, a first cyclone tube, and a first shell, one end of the central tube being inserted into the first shell, a plurality of first cyclone tubes being provided, and the plurality of first cyclone tubes being evenly distributed around the axis of the central tube;

[0008] The filter comprises a second housing and a filter assembly. The second housing is provided with an air inlet pipe. The other end of the central pipe is plugged into the air inlet pipe, so that gas can enter the first housing, flow through the first swirl tube and the central pipe in sequence, enter the filter, and be filtered by the filter assembly.

[0009] The connecting component includes a support member, the air inlet pipe and the center pipe are both inserted into the support member, the support member includes a sleeve section and a flange section, the flange section is fixed to the second shell, and the sleeve section is fixed to the side of the flange section facing away from the second shell.

[0010] As a preferred technical solution of the above-mentioned air filter device, the above-mentioned connecting assembly further includes a clamp, the sleeve section of the above-mentioned support member includes a plurality of support plates, the plurality of support plates are arranged in sequence around the first axis, and two adjacent support plates are spaced apart, along the above-mentioned first axis, one end of the above-mentioned support plate is relatively fixed, and the other end can be close to or away from the above-mentioned first axis, and the above-mentioned clamp can be sleeved on the above-mentioned sleeve section so that all the above-mentioned support plates are gathered toward the above-mentioned first axis;

[0011] The first axis is parallel to the axis of the air intake pipe.

[0012] As a preferred technical solution of the above-mentioned air filtering device, the above-mentioned connecting assembly also includes threaded fasteners, and the above-mentioned flange section is connected to the above-mentioned first shell through multiple threaded fasteners, and the multiple threaded fasteners are arranged in sequence around the axis of the above-mentioned intake pipe.

[0013] As a preferred technical solution for the above-mentioned air filtering device, the above-mentioned center tube is clamped between the above-mentioned air intake pipe and the above-mentioned support member, and a plurality of adjustment grooves are provided at the end of the above-mentioned center tube along its axial direction. The plurality of adjustment grooves are distributed in sequence around the axis of the above-mentioned center tube, and the opening in the depth direction of the above-mentioned adjustment groove is formed on the end face of the above-mentioned center tube facing the above-mentioned filter.

[0014] As a preferred technical solution of the above-mentioned air filtering device, the insertion depth H1 between the above-mentioned air inlet pipe and the above-mentioned central pipe satisfies H1>H2, where H2 is the axial depth of the above-mentioned adjustment groove in the above-mentioned central pipe.

[0015] As a preferred technical solution of the above-mentioned air filter device, the gap between two adjacent support plates and the above-mentioned adjustment grooves are alternately arranged around the axis of the above-mentioned air intake pipe.

[0016] As an optimal technical solution for the above-mentioned air filtering device, the inner ring of the end of the above-mentioned central tube is provided with a first guide surface, and the outer ring is provided with a second guide surface. The angle between the above-mentioned first guide surface and the above-mentioned second guide surface is α, satisfying 0°<α<180°.

[0017] As a preferred technical solution for the above-mentioned air filtering device, the axis of the above-mentioned first cyclone is parallel to the vertical direction, and a first sewage discharge chamber is formed in the above-mentioned first shell. In the above-mentioned vertical direction, the above-mentioned first sewage discharge chamber is located below the above-mentioned first cyclone and is used to receive impurities discharged from the sewage outlet of the above-mentioned first cyclone.

[0018] As an optimal technical solution for the above-mentioned air filtration device, a cleaning port is provided on the side wall of the above-mentioned first sewage discharge chamber, and the bottom wall of the above-mentioned first sewage discharge chamber is inclined so that impurities can be concentrated at the above-mentioned cleaning port along the bottom wall of the above-mentioned first sewage discharge chamber under the action of gravity.

[0019] Also provided is agricultural machinery equipment, comprising the above-mentioned air filtering device.

[0020] Beneficial effects of the utility model:

[0021] An air filtration device and agricultural machinery are provided. The air filtration device includes a pre-filter, a filter, and a connecting assembly. The pre-filter includes a center tube, a first swirl tube, and a first housing. One end of the center tube is inserted into the first housing. Multiple first swirl tubes are provided, evenly distributed around the axis of the center tube. The filter includes a second housing and a filter assembly. The second housing is provided with an air intake pipe. The other end of the center tube is plugged into the air intake pipe, allowing gas to enter the first housing, flow through the first swirl tube and the center tube in sequence, and then enter the filter and be filtered by the filter assembly. The connecting assembly includes a support member. The air intake pipe and the center tube are both inserted into the support member. The support member includes a sleeve section and a flange section. The flange section is fixed to the second housing, and the sleeve section is fixed to the side of the flange section facing away from the second housing.

[0022] With this arrangement, gas can first enter the pre-filter, undergo preliminary filtration through the first cyclone, and then pass into the filter for further filtration. This not only improves the purity of the filtered gas, but also reduces the operating pressure of each filter component through graded filtration, extending their service life. Furthermore, due to vibrations in the operating environment or during use of the equipment itself, the pre-filter and filter can easily swing relative to each other, causing the connection between the center tube and the intake pipe to be squeezed and damaged. To this end, this embodiment also provides a connecting assembly. The connecting assembly includes a support member that is mounted outside the center tube and the intake pipe. The flange section of the support member is fixed to the second housing. The support member is used to straighten the intake pipe and the center tube. When the pre-filter and filter intend to move relative to each other, the intake pipe and the center tube can transmit the relative movement force to the second housing through the support member. The second housing shares the force, thereby maintaining relative stability between the pre-filter and the filter. This ensures the continuous operation of the agricultural machinery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0024] Figure 1 This is a schematic structural diagram of an air filter device provided by an embodiment of the present utility model;

[0025] Figure 2This is an exploded view of the air filter device provided by an embodiment of the present utility model;

[0026] Figure 3 This is a schematic structural diagram of a pre-filter provided by an embodiment of the present utility model;

[0027] Figure 4 This is a schematic diagram of the internal structure of the pre-filter provided by an embodiment of the present utility model;

[0028] Figure 5 is a cross-sectional view of a filter provided by an embodiment of the present utility model;

[0029] Figure 6 It is a structural schematic diagram of the support member provided by an embodiment of the utility model.

[0030] In the picture:

[0031] X, vertical direction;

[0032] 100, pre-filter; 110, center tube; 120, first cyclone tube; 130, first housing; 131, first sewage discharge chamber; 132, ash cleaning port; 133, first connecting chamber; 134, first air inlet chamber;

[0033] 200, filter; 210, second housing; 211, air intake pipe; 220, filter assembly; 221, second cyclone tube; 222, filter element; 230, alarm;

[0034] 300, connecting assembly; 310, supporting member; 311, flange section; 312, sleeve section; 3121, supporting plate; 320, clamp; 330, threaded fastener. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0036] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0037] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0038] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0039] like Figures 1 to 6 As shown, the present invention provides an air filtering device, including a pre-filter 100, a filter 200 and a connecting assembly 300. The pre-filter 100 includes a central tube 110, a first swirl tube 120 and a first shell 130. One end of the central tube 110 is inserted into the first shell 130. There are multiple first swirl tubes 120, and the multiple first swirl tubes 120 are evenly distributed around the axis of the central tube 110. The filter 200 includes a second shell 210 and a filter assembly 220. The second shell 210 is provided with an air inlet pipe 211. The other end of the central tube 110 is plugged into the air inlet pipe 211, and the gas can It enters the first shell 130, flows through the first cyclone 120 and the central tube 110 in sequence, then enters the filter 200 and is filtered by the filter assembly 220; the connecting assembly 300 includes a support member 310, the air intake pipe 211 and the central tube 110 are both inserted into the support member 310, the support member 310 includes a sleeve section 312 and a flange section 311, the flange section 311 is fixed to the second shell 210, and the sleeve section 312 is fixed to the side of the flange section 311 facing away from the second shell 210.

[0040] With this arrangement, gas first enters pre-filter 100, undergoes preliminary filtration through first cyclone 120, and then enters filter 200 for further filtration. This not only improves the purity of the filtered gas, but also reduces the operating pressure on each filter component through graded filtration, extending their service life. Furthermore, due to vibrations in the operating environment or the equipment itself during use, the pre-filter 100 and filter 200 can easily swing relative to each other, squeezing and damaging the connection between the center tube 110 and the intake pipe 211. To this end, a connecting component 300 is also provided in this embodiment. The support member 310 of the connecting component 300 is sleeved outside the central tube 110 and the air intake pipe 211. The flange section 311 of the support member 310 is fixed to the second shell 210. The support member 310 is used to straighten the air intake pipe 211 and the central tube 110. When relative movement is to occur between the pre-filter 100 and the filter 200, the air intake pipe 211 and the central tube 110 can transmit the force of relative movement to the second shell 210 through the support member 310. Since the second shell 210 shares the force, the relative stability between the pre-filter 100 and the filter 200 is maintained.

[0041] For example, a first air inlet chamber 134, a first connecting chamber 133 and a first sewage discharge chamber 131 are formed in the first shell 130, the air inlet of the first shell 130 is connected to the first air inlet chamber 134, the air inlet of the first swirl tube 120 is connected to the first air inlet chamber 134, the exhaust port of the first swirl tube 120 is connected to the air inlet of the center tube 110 in the first connecting chamber 133, and the sewage discharge port of the first swirl tube 120 is connected to the first sewage discharge chamber 131.

[0042] Exemplarily, the first vortex tube 120 includes an inner tube, an outer tube and vortex blades. The inner tube and the outer tube are coaxially arranged, and one end of the inner tube is inserted into the outer tube. The outer circumferential wall of the inner tube and the inner circumferential wall of the outer tube are spaced apart to form a gap. The vortex blades are installed in the gap and can rotate relative to the inner tube and the outer tube. The end of the outer tube away from the inner tube is in a closed shape, that is, the gap between the outer tube and the inner tube forms the air inlet of the first vortex tube 120, the end of the outer tube away from the inner tube is a sewage outlet, and the end of the inner tube away from the outer tube is an exhaust outlet.

[0043] The working principle and process of the first cyclone 120 are as follows: the gas enters the first cyclone 120 from the air inlet and flows toward the sewage outlet. After being disturbed by the cyclone blades, the gas becomes a rotating airflow. The impurities in the gas will continue to move toward the sewage outlet due to the effects of centrifugal force and its own gravity, and be discharged from the first cyclone 120, while the gas will return to flow toward the exhaust outlet, enter the first connecting cavity 133, and then pass through the central tube 110 to achieve the purpose of primary filtration and dust removal of the gas.

[0044] Illustratively, a grid structure is provided at the air inlet of the first shell 130 to intercept relatively large impurities.

[0045] Optionally, the connecting assembly 300 also includes a clamp 320, and the sleeve section 312 of the support member 310 includes a plurality of support plates 3121, and the plurality of support plates 3121 are arranged in sequence around the first axis and two adjacent support plates 3121 are spaced apart. Along the first axis, one end of the support plate 3121 is relatively fixed, and the other end can be close to or away from the first axis. The clamp 320 can be sleeved on the sleeve section 312, so that all the support plates 3121 gather toward the first axis; the first axis is parallel to the axis of the intake pipe 211.

[0046] Exemplarily, the sleeve section 312 of the support member 310 includes a plug-in portion and a sleeve portion along its axial direction, the sleeve portion is fixed to the flange section 311, the plug-in portion is connected to the side of the sleeve portion facing away from the flange section 311, and the plug-in portion is composed of a plurality of support plates 3121. Along the first axis, one end of the support plate 3121 is fixed to the sleeve portion, and the other ends of all the support plates 3121 enclose the plug-in interface of the support member 310. Since a gap is provided between two adjacent support plates 3121, the diameter of the plug-in portion can be adjusted within a certain range. During the assembly process, when the support member 310 is sleeved outside the center pipe 110 and the air intake pipe 211, the support plate 3121 can adaptively move away from the first axis, thereby increasing the diameter of the plug-in portion and facilitating alignment and plug-in. After the connection is completed, the clamp 320 is sleeved on the outside of the support member 310. As the clamp 320 is tightened, the support piece 3121 is centered toward the first axis, reducing the diameter of the connection part, thereby fixing the center pipe 110 and the air inlet pipe 211.

[0047] Exemplarily, the inner diameter of the sleeve section 312 of the support member 310 is 0.5 mm to 1.0 mm larger than the outer diameter of the central tube 110 .

[0048] Exemplarily, a chamfer is provided on a side of the support piece 3121 facing away from the flange section 311 .

[0049] Preferably, the support member 310 is made of steel.

[0050] Optionally, the connection assembly 300 further includes threaded fasteners 330. The flange section 311 is connected to the first housing 130 via multiple threaded fasteners 330, which are arranged sequentially around the axis of the intake pipe 211. This arrangement allows the multiple threaded fasteners 330 to share the load, extending their service life and creating a relatively uniform sealing arrangement. The flange section 311 of the support member 310 can be relatively stably fixed to the first housing 130.

[0051] Optionally, the center tube 110 is clamped between the air intake pipe 211 and the support member 310, and a plurality of adjustment grooves are provided at the end of the center tube 110 along its axial direction. The plurality of adjustment grooves are distributed in sequence around the axis of the center tube 110, and the opening in the depth direction of the adjustment groove is formed on the end face of the center tube 110 facing the filter 200.

[0052] For example, multiple adjustment slots divide the end of the central tube 110 into multiple plug-in tabs. The free ends of the multiple plug-in tabs can be aligned toward the axis of the central tube 110 to reduce the cross-section of the port of the central tube 110, or can be spaced away from the axis of the central tube 110 to expand the cross-section of the port of the central tube 110. In this way, when the central tube 110 is plugged into the air inlet pipe 211, the free ends of the plug-in tabs can adaptively adjust the distance from the axis, facilitating the docking and sleeve installation of the central tube 110 and the air inlet pipe 211. When the clamp 320 is tightened, the support tabs 3121 of the support member 310 are centered and gathered, pressing the plug-in tabs of the central tube 110 against the outer circumferential wall of the air inlet pipe 211, thereby achieving a seal.

[0053] In this way, the central tube 110 and the air inlet pipe 211 are easier to align and plug in, making the central tube 110 more adaptable and further able to hold the air inlet pipe 211 tightly under the action of external forces such as the clamp 320, thereby achieving a tight connection.

[0054] During assembly, the support member 310 is first placed on the outside of the air intake pipe 211 of the filter 200, and the flange section 311 is fixed to the second shell 210. The center tube 110 of the pre-filter 100 is inserted between the support member 310 and the air intake pipe 211 along the axis. Finally, the clamp 320 is fixed to the outside of the support member 310 so that the support member 310, the center tube 110 and the air intake pipe 211 are tightly attached in sequence.

[0055] Illustratively, the inner diameter of the central tube 110 is 0.5 mm to 1.0 mm larger than the outer diameter of the air inlet pipe 211 , and the outer diameter of the central tube 110 is 0.5 mm to 1.0 mm smaller than the inner diameter of the sleeve section 312 of the support member 310 .

[0056] Optionally, the insertion depth H1 between the air inlet pipe 211 and the central pipe 110 satisfies the condition H1>H2, where H2 is the axial depth of the adjustment groove in the central pipe 110. With this arrangement, the outer wall of the air inlet pipe 211 can block the adjustment groove in the central pipe 110, preventing the connection between the air inlet pipe 211 and the central pipe 110 from communicating with the outside world, thereby achieving a sealing effect.

[0057] Optionally, the gap between two adjacent support pieces 3121 and the adjustment groove are alternately arranged around the axis of the air inlet pipe 211. In this way, the support member 310 and the central tube 110 can shield each other, further improving the airtightness of the connection position.

[0058] Furthermore, a labyrinth sealing structure is formed between the air inlet pipe 211 , the central pipe 110 and the support member 310 .

[0059] Optionally, the inner ring of the end of the central tube 110 is provided with a first guide surface, and the outer ring is provided with a second guide surface. The first guide surface and the second guide surface are provided at an angle α, satisfying 0°<α<180°.

[0060] Exemplarily, the air inlet end of the center tube 110 is connected to the first swirl tube 120 in the second shell 210, and the air outlet end of the center tube 110 is connected to the air inlet end of the air inlet pipe 211 of the filter 200. From the air inlet end of the center tube 110 to the direction of its exhaust end, the distance between the first guide surface and the second guide surface gradually decreases. The first guide surface is used to contact with the air inlet pipe 211. When the center tube 110 and the air inlet pipe 211 are axially plugged in, the first guide surface can convert part of the axial force into a radial force, so that the diameter of the center tube 110 is increased so that it can be mounted outside the air inlet pipe 211; the second guide surface is used to contact with the support member 310. The second guide surface can convert part of the axial force into a radial force, so that the diameter of the center tube 110 is reduced so that it can be inserted into the support member 310.

[0061] Optionally, a wire screw sleeve is embedded in the air intake pipe 211. For example, when the first housing 130 is injection molded, the wire screw sleeve is pre-embedded in the air intake pipe 211 to increase the structural strength of the air intake pipe 211.

[0062] Optionally, the axis of the first cyclone 120 is parallel to the vertical direction X, and a first drainage chamber 131 is formed in the first housing 130. The first drainage chamber 131 is located below the first cyclone 120 in the vertical direction X and is used to receive impurities discharged from the drainage port of the first cyclone 120. In this way, the separation efficiency of impurities and gas can be improved.

[0063] Optionally, a cleaning port 132 is provided on the side wall of the first drainage chamber 131, and the bottom wall of the first drainage chamber 131 is tilted so that impurities can be collected at the cleaning port 132 along the bottom wall of the first drainage chamber 131 under the action of gravity. In this way, impurities in the first drainage chamber 131 are easily removed.

[0064] Optionally, the filter assembly 220 includes a second cyclone 221 and a filter element 222, and the gas enters the filter element 222 through the second cyclone 221. In this arrangement, the gas filtered by the pre-filter 100 can be filtered by the second cyclone 221 and the filter element 222 in sequence to achieve further purification.

[0065] Illustratively, a second air inlet chamber, a second connecting chamber and a second sewage discharge chamber are formed in the second shell 210, the air inlet pipe 211 is connected to the second air inlet chamber, the air inlet of the second cyclone tube 221 is connected to the second air inlet chamber, the exhaust port of the second cyclone tube 221 is connected to the air inlet of the filter element 222 in the second connecting chamber, and the sewage discharge port of the second cyclone tube 221 is connected to the second sewage discharge chamber.

[0066] Illustratively, the second shell 210 includes a second shell body and a second cleaning cover. The second cleaning cover is detachably connected to the second shell body, and the second cleaning cover is used to block the second sewage discharge cavity.

[0067] In this embodiment, the second cyclone tube 221 is centrally disposed between the filter element 222 and the air inlet pipe 211 .

[0068] In this embodiment, the filter element 222 is installed at the bottom of the first housing 130 .

[0069] In this embodiment, an alarm 230 is provided at the exhaust port of the filter element 222 . Exemplarily, the alarm 230 is triggered if the pressure at the exhaust port of the filter element 222 exceeds a threshold range.

[0070] Optionally, in the vertical direction X, the pre-filter 100 is installed above the filter 200, the axis of the center tube 110 is parallel to the vertical direction X, the second shell 210 is provided with a mounting seat protruding toward its outer side, the air intake pipe 211 is connected to the top wall of the mounting seat, and the flange section 311 of the support member 310 is fixed to the top of the mounting seat, and the busbar of the mounting seat can intersect with one side of the pre-filter 100.

[0071] Also provided is an agricultural machine, comprising the above-mentioned air filter device. The use of the above-mentioned air filter can reduce the frequency of replacing the filter element 222, thereby ensuring the continuous operation time of the agricultural machine.

[0072] Furthermore, the above are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are possible for those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. An air filter device, characterized in that: include: A prefilter (100), the prefilter (100) comprising a central tube (110), a first cyclone (120) and a first shell (130), one end of the central tube (110) being inserted into the first shell (130), a plurality of first cyclone tubes (120) being provided, and the plurality of first cyclone tubes (120) being evenly distributed around the axis of the central tube (110); A filter (200) comprising a second housing (210) and a filter assembly (220), wherein the second housing (210) is provided with an air intake pipe (211); the other end of the central tube (110) is plugged into the air intake pipe (211), and gas can enter the first housing (130), flow through the first cyclone (120) and the central tube (110) in sequence, and then enter the filter (200) and be filtered by the filter assembly (220); A connecting assembly (300) includes a support member (310), the air inlet pipe (211) and the center pipe (110) are both inserted into the support member (310), the support member (310) includes a sleeve section (312) and a flange section (311), the flange section (311) is fixed to the second shell (210), and the sleeve section (312) is fixed to the side of the flange section (311) facing away from the second shell (210).

2. The air filter device according to claim 1, characterized in that The connecting assembly (300) further comprises a clamp (320), the sleeve section (312) of the support member (310) comprises a plurality of support sheets (3121), the plurality of support sheets (3121) are sequentially arranged around a first axis, and two adjacent support sheets (3121) are spaced apart, along the first axis, one end of the support sheet (3121) is relatively fixed, and the other end can be moved close to or away from the first axis, and the clamp (320) can be sleeved on the sleeve section (312) so that all the support sheets (3121) are gathered toward the first axis; The first axis is parallel to the axis of the air intake pipe (211).

3. The air filter device according to claim 2, characterized in that The connection assembly (300) further includes a threaded fastener (330), and the flange section (311) is connected to the first shell (130) via a plurality of the threaded fasteners (330), wherein the plurality of the threaded fasteners (330) are sequentially arranged around the axis of the intake pipe (211).

4. The air filter device according to claim 2, characterized in that: The central tube (110) is sandwiched between the air intake pipe (211) and the support member (310). The end of the central tube (110) is provided with a plurality of adjustment grooves along its axial direction. The plurality of adjustment grooves are sequentially distributed around the axis of the central tube (110). The opening in the depth direction of the adjustment groove is formed on the end surface of the central tube (110) facing the filter (200).

5. The air filter device according to claim 4, characterized in that: The insertion depth H1 of the air inlet pipe (211) and the central pipe (110) satisfies the condition H1>H2, where H2 is the axial depth of the regulating groove in the central pipe (110).

6. The air filter device according to claim 4, characterized in that: The gap between two adjacent support sheets (3121) and the regulating grooves are alternately arranged around the axis of the air inlet pipe (211).

7. The air filter device according to claim 4, characterized in that: The inner ring of the end of the central tube (110) is provided with a first guide surface, and the outer ring is provided with a second guide surface. The first guide surface and the second guide surface are provided at an angle α, which satisfies 0°<α<180°.

8. The air filter device according to any one of claims 1 to 7, characterized in that: The axis of the first cyclone (120) is parallel to the vertical direction (X), and a first sewage discharge chamber (131) is formed in the first shell (130). In the vertical direction (X), the first sewage discharge chamber (131) is located below the first cyclone (120) and is used to receive impurities discharged from the sewage outlet of the first cyclone (120).

9. The air filter device according to claim 8, characterized in that: A dust cleaning port (132) is provided on the side wall of the first sewage discharge chamber (131), and the bottom wall of the first sewage discharge chamber (131) is inclined so that impurities can be concentrated at the dust cleaning port (132) along the bottom wall of the first sewage discharge chamber (131) under the action of gravity.

10. Agricultural machinery, characterized in that: The air filter comprises the air filter device according to any one of claims 1 to 9.

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