Filter element and pre-filter for air filtering device

Abstract

The present invention is a filter element and a pre-filter for an air filter device. The filter element comprises an assembly shell, a main core, and a pre-filter. A dust discharge pipe opening is provided on the inner annular surface of the assembly shell. The main core is arranged in the assembly shell. The pre-filter is arranged in the assembly shell and comprises an air inlet direction, a radial direction, a front end member, a rear end member, and a plurality of filter units. The radial direction is perpendicular to the air inlet direction. The front end member has a plurality of air inlet holes. The rear end member is fixedly arranged on the front end member and has a plurality of air exhaust holes. A dust collecting space is formed between the front end member and the rear end member; in the radial direction, the dust collecting space is connected to the space outside the edge of the front end member and the edge of the rear end member. The inner annular surface of the assembly shell covers the dust collecting space, and the dust discharge pipe opening is directly opposite to the dust collecting space. The filter unit is arranged between the front end member and the rear end member, and is connected to the air inlet hole, the air exhaust hole, and the dust collecting space. The pre-filter is open in the radial direction, so that dust discharge is avoided, and it is easy to disassemble when cleaning dust, and it can be more lightweight.

Description

Technical Field

[0001] The invention relates to a filter element and a pre-filter thereof, in particular to a filter element used in an air filtering device, and a pre-filter arranged at the front section of the filter element for preliminarily filtering particles and dust with a large mass in the air. Background Art

[0002] The filter element includes an assembly housing, a pre-filter, and a main core. The pre-filter and the main core are installed in the assembly housing and located at the front air inlet, whereby the air will first pass through the pre-filter to initially filter out a portion of the dust before entering the main core.

[0003] In the prior art, the pre-filter has a cover and a box. The cover is combined with the end of the ring wall of the box, and the cover has a plurality of through holes, through which air enters the box. The ring wall of the box has a radial dust discharge port, which is directly opposite to a dust discharge pipe port on the ring wall of the assembly shell. The air entering the box will be initially filtered, and most of the filtered dust will be discharged to the dust discharge pipe port through the dust discharge port. The remaining residual dust depends on the operator to remove and disassemble the pre-filter and pour it out during cleaning and maintenance.

[0004] However, the prior art prefilters have the following disadvantages:

[0005] First, when cleaning, the operator needs to take out the pre-filter first, and then technically disassemble and separate the cover and box body of the pre-filter, so as to open the box body to pour out the remaining dust; but this takes a total of two steps to complete the cleaning. Not only is the process more cumbersome, but when separating the cover and the box body, they may be accidentally overturned due to improper force, causing dust to fall and fly.

[0006] Second, when the pre-filter is installed in the assembly shell, the dust exhaust port of the box body needs to be precisely aligned with the nozzle of the dust exhaust pipe in order to effectively discharge the preliminarily filtered dust; however, it is not easy to align the dust exhaust port 100% with the nozzle of the dust exhaust pipe. If the dust exhaust port and the nozzle of the dust exhaust pipe are relatively offset due to part tolerance or improper operation, resulting in a step difference, it will inevitably cause dust exhaust to be blocked and dust to be stuck.

[0007] Third, the pre-filter of the prior art is composed of a box body and a cover body, and the cover body is combined with the end of the ring wall of the box body to make the pre-filter fully enclosed. In other words, the bottom wall and the ring wall of the box body plus the cover body form a closed dust collecting space; but in this way, the box body will inevitably have a certain weight due to the thick material of the ring wall, which is not conducive to overall lightweight. Summary of the invention

[0008] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a filter element and a pre-filter for an air filtering device, wherein the pre-filter is open, so dust can be dumped without disassembly, thereby simplifying the cleaning and maintenance process, and avoiding dust jamming and dust discharge problems at the dust exhaust pipe port, and at the same time can contribute to overall lightweighting.

[0009] In order to achieve the above-mentioned purpose of the invention, the technical means adopted by the present invention is to design a pre-filter for a filter element of an air filter device, wherein the pre-filter for the filter element of the air filter device comprises:

[0010] - Intake direction;

[0011] A radial direction, which is perpendicular to the air intake direction;

[0012] A front end member having a plurality of air inlet holes; air can pass through each of the air inlet holes along the air inlet direction;

[0013] a rear end member, which is spaced apart from the front end member, and the front end member and the rear end member are arranged in sequence along the air inlet direction; a dust collecting space and an annular opening are sandwiched between the front end member and the rear end member to form a connected dust collecting space; the annular opening extends 360 degrees around, and the dust collecting space is connected to the outside through the annular opening in the radial direction; the rear end member has a plurality of exhaust holes;

[0014] A plurality of filter units are arranged between the front end member and the rear end member, and the plurality of filter units are connected to the air inlet holes, the plurality of filter units are connected to the air outlet holes, and the plurality of filter units are connected to the dust collecting space; each filter unit can filter dust in the air.

[0015] In order to achieve the above-mentioned purpose of the invention, the technical means adopted by the present invention is to design a filter element for an air filter device, wherein the filter element for the air filter device comprises:

[0016] An assembly shell is cylindrical, and a dust exhaust pipe opening is formed on the inner annular surface of the assembly shell;

[0017] a main core, which can be detachably disposed in the assembly housing;

[0018] A pre-filter, which can be detachably disposed in the assembly housing, and the pre-filter comprises:

[0019] An air inlet direction, the pre-filter and the main core are arranged in sequence along the air inlet direction;

[0020] A radial direction, which is perpendicular to the air intake direction;

[0021] A front end member having a plurality of air inlet holes; air can pass through each of the air inlet holes along the air inlet direction;

[0022] a rear end member, which is spaced apart from the front end member, and the front end member and the rear end member are arranged in sequence along the air inlet direction; a dust collecting space and an annular opening are sandwiched between the front end member and the rear end member to form a connected dust collecting space; the annular opening extends 360 degrees around, and the dust collecting space is connected to the outside through the annular opening in the radial direction; the inner annular surface of the assembly shell surrounds and covers the annular opening and the dust collecting space, and the dust exhaust pipe opening of the assembly shell is opposite to the annular opening and the dust collecting space; the rear end member has a plurality of exhaust holes;

[0023] A plurality of filter units are arranged between the front end member and the rear end member, and the plurality of filter units are connected to the air inlet holes, the plurality of filter units are connected to the air outlet holes, and the plurality of filter units are connected to the dust collecting space; each filter unit can filter dust in the air.

[0024] The advantage of the present invention is that the dust collecting space and a ring-shaped opening extending around the front end and the rear end are formed by fixing the front end and the rear end to each other and sandwiching them in the middle. The ring-shaped opening extends 360 degrees around the dust collecting space, and the dust collecting space is connected to the space outside the edge of the front end and the edge of the rear end through the ring-shaped opening in the radial direction, that is, the dust collecting space is open and connected to the outside in the radial direction; in other words, the pre-filter itself does not have an annular wall, but directly uses the inner annular surface of the assembly shell to surround and cover the dust collecting space. Therefore, when air enters from the air inlet and passes through the filter unit, the filtered dust stays between the front end, the rear end and the inner annular surface of the assembly shell. In this way, the present invention has the following advantages compared to the existing pre-filter:

[0025] First, since the dust collecting space is radially open, when the pre-filter is taken out from the assembly shell, the pre-filter loses the radial annular wall (i.e., the inner annular surface of the assembly shell), and the dust collecting space is radially connected to the outside again, whereby the dust remaining in the dust collecting space can directly fall out radially between the front end and the rear end. In this way, the cleaning and maintenance operator only needs to take the pre-filter out of the assembly shell to pour out the dust, and there is no need to disassemble the pre-filter. This can simplify the process and increase efficiency, and can also avoid tipping over due to improper force during disassembly.

[0026] Secondly, since the annular opening formed between the edges of the front end piece and the rear end piece extends 360 degrees around, the pre-filter is completely open to the outside in the radial direction. Therefore, there is no problem that the dust exhaust port of the pre-filter needs to be precisely aligned with the dust exhaust pipe port of the assembly shell. Instead, the dust exhaust pipe port is located at any position in the radial direction of the pre-filter. As long as it is aligned with the dust collecting space, the dust can be discharged smoothly.

[0027] Thirdly, the pre-filter only has a front end part and a rear end part, eliminating the annular wall structure, reducing the amount of material used and the weight, and thus being more conducive to overall lightweighting.

[0028] Preferably, the pre-filter of the filter element for the air filtering device comprises a dust scraping sealing ring which is sleeved on the rear end member.

[0029] Preferably, the pre-filter for the filter element of the air filtering device, wherein the pre-filter for the filter element of the air filtering device further comprises a plurality of connecting parts, which connect the front end part and the rear end part.

[0030] Preferably, the pre-filter of the filter element for an air filtering device, wherein each of the connecting parts comprises a front connecting column, which is formed on a side of the front end part facing the rear end part, and the front connecting column extends toward the rear end part; a rear connecting column, which is formed on a side of the rear end part facing the front end part, and the rear connecting column extends toward the front end part, the rear connecting column is hollow, and the rear connecting column is sleeved and fixed on the front connecting column.

[0031] Preferably, the pre-filter of the filter element for an air filtering device, wherein the front connecting column is hollow, and has a front step surface inside the front connecting column, and the front step surface faces the direction away from the rear end piece; the rear connecting column has a rear step surface inside the rear connecting column, and the rear step surface faces the direction away from the front end piece; thereby, the front connecting column and the rear connecting column can be passed through by a screw and can be locked by a nut.

[0032] Preferably, the pre-filter of the filter element for an air filtering device, wherein each of the filter units comprises a front tube, which is arranged on the front end member, and the front tube is connected to one of the air inlet holes; a spiral channel and a linear channel are provided in the front tube, and the spiral channel and the linear channel are arranged in sequence along the air inlet direction and are connected to each other; the spiral channel enables the air passing through to spirally advance in the linear channel along the air inlet direction; the linear channel is connected to the dust collecting space; a rear tube, which is arranged on the rear end member, and the rear tube is connected to one of the exhaust holes; the rear tube is penetrated in the linear channel of the front tube, and the rear tube is connected to the linear channel; the rear tube is spaced apart from the inner annular surface of the front tube.

[0033] Preferably, in the pre-filter of the filter element for an air filtering device, the front pipe has an air inlet end and an air outlet end, the air inlet end is connected to the front end member, and the air outlet end is spaced apart from the rear end member.

[0034] Preferably, the filter element for an air filtering device, wherein the pre-filter comprises a scraper sealing ring which is sleeved on the rear end member; the scraper sealing ring surrounds and abuts against the inner annular surface of the assembly shell in the radial direction, and the scraper sealing ring is located behind the dust exhaust pipe opening in the air inlet direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The following drawings are only intended to illustrate and explain the present invention, and do not limit the scope of the present invention.

[0036] Figure 1 It is a three-dimensional appearance diagram of the filter element for an air filter device of the present invention.

[0037] Figure 2 It is a component exploded view of the filter element for an air filter device of the present invention.

[0038] Figure 3 It is a side sectional view of a filter element for an air filter device of the present invention.

[0039] Figure 4 It is a component exploded view of a pre-filter of a filter element for an air filter device of the present invention.

[0040] Figure 5 It is a side cross-sectional view of a filter unit of a pre-filter of a filter element for an air filter device according to the present invention.

[0041] Figure 6 It is another component exploded view of the pre-filter of the filter element for an air filter device of the present invention.

[0042] Figure 7 The present invention is a side sectional view of a front end member and a rear end member of a pre-filter of a filter element for an air filter device.

[0043] Description of Figure Numbers:

[0044] D1, air intake direction;

[0045] D2, radial;

[0046] 10. Assembly housing;

[0047] 11. Dust exhaust pipe opening;

[0048] 20. Main core;

[0049] 30. Pre-filter;

[0050] 31. Front end parts;

[0051] 311, air intake;

[0052] 312, front connecting column;

[0053] 3121, front level surface;

[0054] 32. Rear end parts;

[0055] 321, exhaust hole;

[0056] 322, rear connecting column;

[0057] 3221, the back class face;

[0058] 33. Filter unit;

[0059] 331, front tube;

[0060] 3311, air intake end;

[0061] 3312, exhaust end;

[0062] 3313, spiral channel;

[0063] 3314, linear channel;

[0064] 332, rear tube;

[0065] 34. Dust scraping sealing ring;

[0066] 35. Dust collection space. DETAILED DESCRIPTION

[0067] The following is a further description of the technical means adopted by the present invention to achieve the predetermined purpose of the invention with reference to the accompanying drawings and preferred embodiments of the present invention.

[0068] Please refer to Figure 1 , Figure 2 and Figure 3 The filter element for an air filter device of the present invention comprises an assembly housing 10 , a main core 20 , and a pre-filter 30 .

[0069] The assembly housing 10 is cylindrical, and a dust exhaust pipe opening 11 is formed on the inner annular surface.

[0070] The main core 20 is detachably disposed in the assembly housing 10 .

[0071] Please refer to Figure 4 , Figure 5 , Figure 6 and Figure 7 The pre-filter 30 can be detachably disposed in the assembly housing 10, and includes an air intake direction D1, a radial direction D2, a front end member 31, a rear end member 32, a plurality of filter units 33, and a dust scraping seal ring 34. The pre-filter 30 and the main core 20 are sequentially arranged along the air intake direction D1. The radial direction D2 is perpendicular to the air intake direction D1. Here, the radial direction D2 represents all directions located on an imaginary plane perpendicular to the air intake direction D1.

[0072] The front end member 31 has a plurality of air inlet holes 311. Air can pass through each of the air inlet holes 311 along the air inlet direction D1. The rear end member 32 has a plurality of exhaust holes 321. The front end member 31 and the rear end member 32 are arranged in sequence along the air inlet direction D1, and the front end member 31 and the rear end member 32 are arranged at intervals. A dust collecting space 35 and an annular opening 36 are sandwiched between the front end member 31 and the rear end member 32 to form a connected dust collecting space. The annular opening 36 extends 360 degrees around. The dust collecting space 35 is connected to the outside through the annular opening 36 in the radial direction D2, that is, it is connected to the space outside the edge of the front end member 31 and the edge of the rear end member 32; in other words, the dust collecting space 35 is open and connected to the outside in the radial direction D2. The inner annular surface of the assembly housing 10 surrounds and covers the dust collecting space 35 and the annular opening 36, and the dust exhaust pipe opening 11 of the assembly housing 10 is directly opposite to the annular opening 36 and the dust collecting space 35.

[0073] Specifically, please refer to Figure 7 , the front end member 31 and the rear end member 32 are fixed to each other, and in the present embodiment, the structure in which the front end member 31 and the rear end member 32 are fixed to each other is as follows. The prefilter 30 includes a plurality of connecting members, which connect the front end member and the rear end member; more specifically, each of the connecting members includes a front connecting column 312 and a rear connecting column 322. The front connecting column 312 is formed on a side of the front end member 31 facing the rear end member 32, and extends toward the rear end member 32. The front connecting columns 312 are arranged at intervals. The rear connecting columns 322 are formed on a side of the rear end member 32 facing the front end member 31, and extend toward the front end member 31. The rear connecting columns 322 are arranged at intervals and fixed to the front end member 31. Each front connecting column 312 is hollow, and has a front step surface 3121 inside, and the front step surface 3121 faces the direction away from the rear end member 32. Each rear connecting column 322 is hollow and has a rear step surface 3221 inside, and the rear step surface 3221 faces the direction away from the front end member 31. Each rear connecting column 322 is respectively sleeved and fixed to each front connecting column 312, and the front connecting column 312 and the rear connecting column 322 can be passed through by a screw and can be locked by a nut. When locked, the screw and the nut are respectively against the front step surface 3121 and the rear step surface 3221.

[0074] However, the structure in which the front end member 31 and the rear end member 32 are fixed to each other is not limited to the above. For example, the front connecting column 312 and the rear connecting column 322 may not be locked by means of screws and nuts. In this case, the front step surface 3121 and the rear step surface 3221 are not required. Instead, the front connecting column 312 and the rear connecting column 322 may be mutually sleeved and then fixed by means of bolts. Alternatively, the front connecting column 312 and the rear connecting column 322 may not be mutually sleeved, but only the front connecting column 312 or the rear connecting column 322 may be directly fixed to the rear end member 32 or the front end member 31. Alternatively, the rear end member 32 or the front end member 31 may be fixed to each other by means of other independent components, as long as the dust collecting space 35 can be open in the radial direction D2 and connected to the outside.

[0075] Please refer to Figure 4 , Figure 5 and Figure 6 The filter unit 33 is disposed between the front end member 31 and the rear end member 32, and is connected to each air inlet 311, each air outlet 321, and the dust collecting space 35. Each filter unit 33 can filter dust in the air. Specifically, each filter unit 33 is connected to each air inlet 311 and each air outlet 321, that is, one-to-one connection, but not limited thereto. In addition, in this embodiment, each filter unit 33 includes a front pipe 331 and a rear pipe 332.

[0076] The front pipe 331 is arranged on the front end part 31 and is connected to one of the air inlet holes 311. The front pipe 331 has an air inlet end 3311, an air outlet end 3312, a spiral channel 3313, and a linear channel 3314. The air inlet end 3311 is connected to the front end part 31 and is connected to the air inlet hole 311, and the air outlet end 3312 is spaced apart from the rear end part 32. The spiral channel 3313 and the linear channel 3314 are arranged in sequence along the air inlet direction D1 and are connected to each other, and the spiral channel 3313 is connected to the air inlet end 3311 and the linear channel 3314 is connected to the air outlet end 3312. The spiral channel 3313 enables the air passing through to spirally advance in the linear channel 3314 along the air inlet direction D1. The linear channel 3314 is connected to the dust collecting space 35. The rear pipe 332 is arranged on the rear end part 32 and is connected to one of the air outlet holes 321. The rear tube 332 is disposed in the linear passage 3314 of the front tube 331 and communicates with the linear passage 3314. The rear tube 332 is spaced apart from the inner annular surface of the front tube 331, that is, in this embodiment, the rear tube 332 and the rear end member 32 are not in direct contact with the front tube 331 and the front end member 31.

[0077] By means of the above structure, air can enter the air inlet end 3311 from the air inlet hole 311, and then move along the spiral channel 3313 to the linear channel 3314, and after the air passes through the spiral channel 3313, it will continue to spirally move along the air inlet direction D1 in the linear channel 3314 due to inertia; that is, the spiral channel 3313 makes the airflow that originally moves in a straight line form a cyclone. Then the cyclone moves along the air inlet direction D1 and contacts the rear pipe 332. At this time, the airflow at the center of the cyclone enters the rear pipe 332 along the air inlet direction D1 and is discharged from the pre-filter 30 from the exhaust hole 321; and at this time, due to the centrifugal force, the dust with a larger mass in the cyclone will be thrown to the edge of the cyclone and enter between the front pipe 331 and the rear pipe 332 along the inner wall of the front pipe 331, and finally be discharged into the dust collecting space 35 from the gap between the exhaust end 3312 of the front pipe 331 and the rear end member 32.

[0078] That is to say, the present invention is a centrifugal pre-filter in this embodiment, but it is not limited to this. In other embodiments, it can also adopt the structure of an electrostatic-cyclone tube pre-filter, that is to say, the structure in which the dust collecting space 35 is radially connected to the outside in the present invention can also be applicable to the electrostatic-cyclone tube pre-filter. And the filter unit 33 can also be unrelated to cyclone and centrifugal filtration, but only a general filter screen set on the rear end part 32, and the dust blocked by the filter screen falls into the dust collecting space 35, etc. In addition, in this embodiment, the front pipe 331 is an independent component independent of the front end part 31 and the rear end part 32, and the rear pipe 332 is a structure formed on the rear end part 32 and formed integrally with the rear end part 32, but in other embodiments, it is not limited to this. Both can be independent components, or they can be formed integrally with the front end part 31 and the rear end part 32 respectively, and the front pipe 331 and the rear pipe 332 can also be formed integrally but independent of the front end part 31 and the rear end part 32.

[0079] Furthermore, the aforementioned front end member 31 and rear end member 32 may also be fixed to each other via a front tube 331 and a rear tube 332. In this case, the front tube 331 and the rear tube 332 themselves are mutually connected and fixed or integrally formed, and the front end member 31 is connected and fixed by the front tube 331 and the rear end member 32 is connected and fixed by the rear tube 332, thereby fixing the front end member 31 and the rear end member 32 to each other. In this case, there is no need to connect and fix through connecting members (front connecting column 312, rear connecting column 322), so there may be no connecting members.

[0080] The scraper seal ring 34 is sleeved on the rear end member 32. The scraper seal ring 34 surrounds and abuts against the inner annular surface of the assembly housing 10 in the radial direction D2 and is located behind the dust exhaust pipe 11 in the air intake direction D1. When the pre-filter 30 moves relative to the assembly housing 10, the scraper seal ring 34 moves against the inner annular surface of the assembly housing 10, thereby scraping off the dust adhering to the inner annular surface of the assembly housing 10 and discharging the dust from the assembly housing 10. However, in other embodiments, the scraper seal ring 34 may be omitted, so that the operator can remove the pre-filter 30 and then discharge the dust from the pre-filter 30, or the dust may be scraped and discharged from the assembly housing 10 through the seal ring on the main core 20.

[0081] When in use, air enters the front pipe 331 of the filter unit 33 through the air inlet hole 311 along the air inlet direction D1, and continues to move along the spiral channel 3313 to form a cyclone. The air in the center of the cyclone will enter the rear pipe 332 and be discharged from the exhaust hole 321, and then filtered by the main core 20. The air at the edge of the cyclone collects dust with a larger mass, and flows from the gap between the front pipe 331 and the rear pipe 332 to the dust collecting space 35, thereby the air before entering the pre-filter 30 is initially filtered, and about 70% to 80% of the dust will be filtered at this time. Subsequently, part of the 70% to 80% of the dust is discharged from the dust collecting space 35 to the dust exhaust pipe port 11 of the assembly shell 10, and the remaining part remains in the dust collecting space 35 and adheres to the inner annular surface of the assembly shell 10.

[0082] When cleaning, the operator only needs to pull out the pre-filter 30 from the assembly housing 10 in the opposite direction of the air intake direction D1. At the same time, the dust scraper seal ring 34 will move closely against the inner ring surface of the assembly housing 10, thereby scraping off the dust adhering to the inner ring surface of the assembly housing 10; and, the moment the pre-filter 30 is pulled out, the dust collecting space 35 loses the assembly housing 10 as a ring wall and becomes open, so the remaining dust remaining in the dust collecting space 35 and the dust under the dust scraper seal ring 34 will directly fall out of the pre-filter 30 in the radial direction D2. In this way, only one step is needed to pull out the pre-filter 30 to dump and remove the dust inside.

[0083] The advantage of the present invention is that the dust collecting space 35 is formed by fixing the front end member 31 and the rear end member 32 to each other and sandwiching them in the middle, and the dust collecting space 35 is connected to the space outside the edge of the front end member 31 and the edge of the rear end member 32 in the radial direction D2, that is, the dust collecting space 35 is open to the outside in the radial direction D2. In other words, the pre-filter 30 itself does not have an annular wall, but directly uses the inner annular surface of the assembly shell 10 to surround and cover the dust collecting space 35. Therefore, when air enters from the air inlet 311 and passes through the filter unit 33, the filtered dust stays between the front end member 31, the rear end member 32, and the inner annular surface of the assembly shell 10. Therefore, the present invention has the following advantages:

[0084] First, since the dust collecting space 35 is open in the radial direction D2, when the pre-filter 30 is taken out from the assembly shell 10, the pre-filter 30 loses the annular wall in the radial direction D2 (i.e., the inner annular surface of the assembly shell 10), and the dust collecting space 35 is again connected to the outside in the radial direction D2, thereby the dust remaining in the dust collecting space 35 can directly fall out from the radial direction D2 between the front end part 31 and the rear end part 32. In this way, the cleaning and maintenance operator only needs to take the pre-filter 30 out of the assembly shell 10 to dump the dust, and there is no need to technically disassemble the pre-filter 30, thereby simplifying the process and increasing efficiency, and also avoiding overturning due to improper force during disassembly.

[0085] Second, since the pre-filter 30 is completely open to the outside in the radial direction D2, there is no problem that the dust exhaust port of the pre-filter 30 needs to be precisely aligned with the dust exhaust pipe port 11 of the assembly shell 10. Instead, the dust exhaust pipe port 11 is located at any position on the radial direction D2 of the pre-filter 30. As long as it is aligned with the dust collecting space 35, the dust can be discharged smoothly.

[0086] Thirdly, the pre-filter 30 only has a front end member 31 and a rear end member 32 , eliminating the annular wall structure, thereby reducing the amount of material used and the weight, and thus being more conducive to overall lightweighting.

[0087] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A filter element for an air filter device, characterized in that: The filter element for the air filtering device comprises An assembly shell is cylindrical, and a dust exhaust pipe opening is formed on the inner annular surface of the assembly shell; a main core, which can be detachably disposed in the assembly housing; A pre-filter, which can be detachably disposed in the assembly housing, and the pre-filter comprises: An air intake direction, the pre-filter and the main core are arranged in sequence along the air intake direction; A radial direction, which is perpendicular to the air intake direction; A front end member having a plurality of air inlet holes; air can pass through each of the air inlet holes along the air inlet direction; a rear end member, which is spaced apart from the front end member, and the front end member and the rear end member are arranged in sequence along the air inlet direction; a dust collecting space and an annular opening are sandwiched between the front end member and the rear end member to form a connected dust collecting space; the annular opening extends 360 degrees around, and the dust collecting space is connected to the outside through the annular opening in the radial direction; the inner annular surface of the assembly shell surrounds and covers the annular opening and the dust collecting space, and the dust exhaust pipe opening of the assembly shell is opposite to the annular opening and the dust collecting space; the rear end member has a plurality of exhaust holes; A plurality of filter units are arranged between the front end member and the rear end member, and the plurality of filter units are connected to the air inlet holes, the plurality of filter units are connected to the air outlet holes, and the plurality of filter units are connected to the dust collecting space; each filter unit can filter dust in the air; A plurality of connecting members connecting the front end member and the rear end member; Each of the filtering units comprises: a front pipe, which is arranged on the front end member and is connected to one of the air inlet holes; the front pipe has a spiral channel and a linear channel, the spiral channel and the linear channel are arranged in sequence along the air inlet direction and are connected to each other; the spiral channel enables the air passing through the linear channel to spirally move forward along the air inlet direction; the linear channel is connected to the dust collecting space; a rear pipe, which is arranged on the rear end member and communicates with one of the exhaust holes; the rear pipe is passed through the linear passage of the front pipe and communicates with the linear passage; the rear pipe is spaced apart from the inner annular surface of the front pipe; The front pipe has an air intake end and an air exhaust end, the air intake end is connected to the front end member, and the air exhaust end is spaced apart from the rear end member.

2. The filter element for an air filter device according to claim 1, characterized in that: The prefilter comprises: A dust scraper sealing ring is sleeved on the rear end member; the dust scraper sealing ring surrounds and abuts against the inner annular surface of the assembly shell in the radial direction, and the dust scraper sealing ring is located behind the dust exhaust pipe opening in the air inlet direction.

3. The filter element for an air filter device according to claim 1, characterized in that: Each of the connecting pieces comprises: a front connecting post formed on a side of the front end member facing the rear end member, and the front connecting post extends toward the rear end member; A rear connecting column is formed on a side of the rear end member facing the front end member, and the rear connecting column extends toward the front end member. The rear connecting column is hollow, and the rear connecting column is sleeved and fixed to the front connecting column.

4. The filter element for an air filter device according to claim 3, characterized in that: The front connecting column is hollow, and has a front step surface inside, and the front step surface faces away from the rear end member; The rear connecting column has a rear step surface inside, and the rear step surface faces the direction away from the front end member; thereby, the front connecting column and the rear connecting column can be passed through by the screw and can be locked by the nut.

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