Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Referring to fig. 1 to 3, a filtering device 100 according to an embodiment of the present invention is used for filtering impurities such as particulate matters in a gas to purify the gas (i.e. to purify air), and filtering out the impurities such as particulate matters. The impurities such as particulate matter may be industrial dust or living dust, etc., and for convenience of the following description, the dust is defaulted in this application. The filtering apparatus 100 includes a dust bucket 10 formed with a dust bucket chamber 11, a dust bucket cover assembly 20 detachably provided on the dust bucket 10, and a cyclone separating apparatus 30 integrated into the dust bucket cover assembly 20. The filtering device 100 of the present embodiment is not provided with a power source, and is required to be externally connected with the power source when in use. The power source 300 may be a vacuum cleaner or a motor with fan blades, as shown in fig. 5, and the filter device 100 will be used as an unpowered accessory of the power source 300, so that the cost can be further reduced and the application range can be expanded. Of course, the power source may be integrated with the device (see fig. 10). At this point, the filter apparatus 100 is a powered dust extraction tool product. In conjunction with fig. 5, when the filtering device 100 of the present application is in use, the air inlet 331 of the filtering device 100 is in butt joint with the tool 400 having the dust collection channel, and the air outlet 333 is in butt joint with the power source 300, wherein in fig. 5, the tool 400 is a wall surface grinding machine, and of course, in other implementations, the air inlet 331 can also be directly in butt joint with the dust collection pipe for directly collecting dust.
In this embodiment, the wind speed at the wind inlet is set to 8m/s or more. When the filter device 100 is used in combination with tools such as the wall grinding machine 400, the wall grinding machine 400 generates a large amount of dust during operation, and the specific gravity of the dust is large, so that in order to ensure that the dust does not fall out of the grinding disc range of the wall grinding machine 400 during operation, the airflow acting force acting on the dust surface must be ensured to be greater than the dust weight (airflow dynamic pressure is the dust cross section > =dust weight). According to Bernoulli's law, the air dynamic pressure is in a ratio with the square of the air velocity, so that the filter device 100 needs to be matched with the wall mill 400 and the like to ensure a certain wind speed at the suction port of the wall mill 400, and the requirements can be met because the flow channels are connected in series, namely, the wind speed at the air inlet of the cyclone separation device of the filter device 100 is required to be certain, and the wind speed at the air inlet is more than or equal to 8m/s.
Referring to fig. 2 to 4, the cyclonic separating apparatus 30 comprises a cyclone generator barrel 32 which forms a cyclone chamber 31. The cyclone separating apparatus 30 is provided with an air inlet 331 and a dust outlet 332, the air inlet 331 is the air inlet 331 of the filtering apparatus 100, and the air inlet 331 is used for enabling the gas to be separated to enter the cyclone separating chamber 31. Dust in the cyclone chamber 31 enters the dust barrel chamber 11 at the dust outlet 332 (the direction indicated by the arrow c in fig. 4 is the dust falling direction from the dust outlet into the dust barrel chamber 11). The cyclone chamber 31 is disposed transversely within the dirt cup lid assembly 20, and the axis of the cyclone chamber 31 is perpendicular or substantially perpendicular to the axis of the dirt cup chamber 11 (the direction indicated by arrows a1-a2 in FIG. 4 being the direction of the axis of the dirt cup chamber 11).
Referring to fig. 2 to 4, in the present embodiment, the cyclone cylinder 32 is partially located in the dust barrel chamber 11. In order to facilitate the manufacture of the injection molding process and prevent the disassembly and maintenance after long-term use, the dust cap assembly 20 comprises an upper cap 21 and a lower cap 22, and a cyclone separating cavity 31 is formed by enclosing the upper cap 21 and the lower cap 22. Specifically, the cyclone separating chamber 31 includes an upper separating chamber 311 formed on the upper cover 21 and a lower separating chamber 312 formed on the lower cover 22, the upper separating chamber 311 being located in the dust tub chamber 11, the upper separating chamber 311 and the lower separating chamber 312 each accounting for one half of the cyclone separating chamber 31.
In this embodiment, the filter device 100 is formed with a suction duct 40 extending outwardly, the axis of the suction duct 40 being tangential or substantially tangential to the cyclone generator cylinder 32. The outer port of the suction duct 40 forms the air inlet 331 of the cyclonic separating apparatus 30.
The dust outlet 332 is directly abutted with the dust barrel cavity 11 so that dust in the cyclone separation cavity 31 directly enters the dust barrel cavity 11 at the dust outlet 332, and the dust outlet direction of the cyclone separation cavity 31 is indicated by an arrow c in fig. 4. The dust outlet 332 is located in the dust bin chamber 11, and the dust outlet 332 is located at a low point of the cyclone generator cylinder 32 in the height direction of the dust bin 10.
Referring to fig. 2 and 4 in combination with fig. 1, the cyclonic separating apparatus 30 comprises an outlet duct body 34 for the outlet air. The air outlet pipe 34 includes a first air outlet pipe body 341 located outside the cyclone separating chamber 31, and an air outlet 333 is formed at an upper end of the first air outlet pipe body 341, so that an air outlet direction of the cyclone separating apparatus 30 is perpendicular or substantially perpendicular to an axial direction of the cyclone separating chamber 31, that is, air in the first air outlet pipe body 341 flows upward along a height direction of the dust bucket 10 (a direction indicated by an arrow a1-a2 in fig. 4 is a height direction of the dust bucket 10 and is also an axial direction of the dust bucket 10), and by this arrangement, an axial height of the dust bucket 10 is reduced, which is also beneficial for air outlet. The air outlet 333 is the air outlet 333 of the filtering device 100. The air outlet pipe 34 further includes a second air outlet pipe body 342 located in the cyclone separating chamber 31, where an axis of the second air outlet pipe body 342 is parallel to an axis of the cyclone separating chamber 31, and in this embodiment, the axis of the second air outlet pipe body 342 overlaps with an axis of the cyclone separating chamber 31, but in other embodiments, the axis of the second air outlet pipe body 342 may not overlap with an axis of the cyclone separating chamber 31.
The length of the second air outlet pipe body 342 is 50% -90% of the length of the cyclone separating chamber 31, preferably, the length of the second air outlet pipe body 342 is 60% -80% of the length of the cyclone separating chamber 31, so as to improve the separation effect of dust in the gas in the cyclone separating chamber 31. Because the separation of the dust is a centrifugal separation process, the separation of the dust needs to have an acceleration separation process, and a certain separation time is needed, if the length of the second air outlet pipe body 342 is too short, the separation time is short, the dust is not separated, and the air flow is easy to take away the dust which is not separated yet; however, too long a duct may increase the internal friction loss, and if the length of the second air outlet duct body 342 is too long, the separation effect of the cyclone chamber 31 may be reduced. In this embodiment, the first air outlet pipe body 341 and the second air outlet pipe body 342 are directly connected to each other through the third air outlet pipe body 343, however, in other embodiments, the first air outlet pipe body 341 and the second air outlet pipe body 342 are directly connected to each other, for example, the first air outlet pipe body 341 is partially disposed in the cyclone chamber 31 and partially disposed outside the cyclone chamber 31, wherein the air outlet 333 is located outside the cyclone chamber 31.
By integrating the cyclone separation device 30 on the dust cap assembly 20 and transversely arranging the cyclone separation device on the dust cap assembly 20, the height of the filter device 100 is reduced, meanwhile, as the dust outlet 332 is vertical to the second air outlet pipe body 342, the mouth of the second air outlet pipe body 342 is far away from the surface of settled dust, no dust return phenomenon occurs, the height of the filter device 100 is further reduced, the effective volume of the dust barrel 10 is increased, and the cyclone separation device is particularly suitable for treating a large amount of dust and is particularly suitable for the industrial dust collector 300.
When the filtering apparatus 100 is used for large ash amount treatment and ash is poured by adopting a bung (not numbered), the cyclone separation device 30 is integrated on the dust cap assembly 20, so that the filtering apparatus is convenient to detach and convenient to pour ash.
The upper and lower covers 21 and 22 are firmly connected by fasteners, and a sealing member (not shown) is provided to seal the upper and lower covers 21 and 22 of the dust cap assembly 20. The lower cover 22 is covered on the bung hole of the dust barrel 10 to close the bung hole. A seal (not shown) is provided on one of the lower cover 22 and the mouth of the dust bin 10 to form a gas tight connection.
The lower cover 22 and the dust bucket 10 are connected by a snap-fit structure that snaps fast. The snap feature may be a conventional hardware snap. The integrated fastening structure disclosed in this embodiment, referring to fig. 2 and 3, may include a hook 221 formed by extending downward from the lower cover 22 and a holding portion 12 formed on the dust bucket 10 and engaged with the hook 221. In this embodiment, in order to facilitate the assembly between the dust cap assembly 20 and the dust barrel 10, the dust barrel 10 is formed with a flange portion 13 protruding laterally outward near the opening, and the holding portion 12 is a bottom wall of the flange portion 13. When in use, the dust bucket cover assembly 20 is downwards applied to the clamping hook part 221 of the lower cover 22 to generate elastic deformation and be clamped with the flange part 13 of the dust bucket 10 after being reset.
It should be noted that, in this example, the dust barrel 10 has a barrel shape, and there are no devices such as rollers that are convenient to move. In particular applications, the dust bucket 10 may take any shape, such as rectangular, oval, trapezoidal, etc., as desired. The barrel bottom body can also be provided with a roller and other devices.
Referring to fig. 1 and 4, in order to fix the first air outlet pipe body 341 and the second air outlet pipe body 342 firmly in the dust bucket cover assembly 20, a pipe body groove 35 is further formed in the dust bucket cover assembly 20, and a third air outlet pipe body 343 is disposed in the pipe body groove 35, and the third air outlet pipe body 343 is a bent pipe. The duct body groove 35 is located at one side of the cyclone separating chamber 31, in this embodiment, the third air outlet duct body 343 is divided into two parts, the first part 3431 is integrally formed with the first air outlet duct body 341, and the second part 3432 is integrally formed with the second air outlet duct body 342. The second portion 3432 of the third air outlet pipe body 343 is formed with a first tooth 3433 and a second tooth 3434, and the wall of the pipe slot 35 is formed with a first tooth slot (not numbered) and a second tooth slot (not numbered) matching the first tooth 3433 and the second tooth 3434, wherein the diameter of the first tooth 3433 is larger than the diameter of the second tooth 3434, and the first tooth 3433 is close to the second air outlet pipe body 342.
It should be noted that, since the axis of the first air outlet pipe body 341 of the air outlet pipe body 34 is perpendicular or approximately perpendicular to the axis of the cyclone separating chamber 31 in the present application, the axis of the second air outlet pipe body 342 is parallel or approximately parallel to the axis of the cyclone separating chamber 31, and the axis of the cyclone separating chamber 31 is perpendicular or approximately perpendicular to the axis of the dust bucket chamber 11, when the filtering apparatus 100 is in use, the air in the cyclone separating chamber 31 flows along the horizontal direction (which may be referred to as the first direction, the direction indicated by the arrow b in fig. 4) in the vertical direction (which may be referred to as the second direction, the direction indicated by the arrow a1 in fig. 4) after entering the air outlet pipe body 34. Since it moves first in the first direction and then in the second direction, it is ensured that the cyclone separating apparatus 30 can be placed horizontally and the axial height can be ensured. The dashed lines with arrows in fig. 4 are the direction of flow of the gas within the filter device 100.
Referring to fig. 6 and 7, a filtering device 200 according to another embodiment of the present application is different from the filtering device 100 (see fig. 1) according to the previous embodiment in that: the dust cap assembly 50 is structurally different and the filter apparatus 200 of the present embodiment further includes a secondary separation apparatus 60. The secondary separation device 60 is disposed in parallel with the cyclone separation device 70 in the height direction, and the gas is separated by the cyclone separation device 70 and then enters the secondary separation device 60 (the dashed line with an arrow in fig. 9 indicates the flow direction of the gas in the filter device 200), that is, the first air outlet pipe body 741 of the cyclone separation device 70 is in butt joint with the secondary separation device 60.
In the present embodiment, referring to fig. 7 to 9, the secondary separation device 60 employs a multi-cone cyclone. Specifically, the secondary separation device 60 includes a dust cup 61, an upper seal plate 62 provided on the dust cup 61, a plurality of secondary cylinders 63 provided below the upper seal plate 62 and located in the dust cup 61, and a secondary cylinder cover 64 provided on the upper seal plate 62.
A dust cup 61 is provided in the dust bin chamber 11 for receiving dust separated by the secondary separating apparatus 60. To further facilitate cleaning of dust by the user, and to reduce the cleaning steps, the bottom of the secondary drum 63 may also be provided with a dust drop port 631, which dust drop port 631 is located in the dust cup 61. The dust cup 61 is provided with a secondary dust outlet 611, and the dust outlet direction of the dust cup 61 is indicated by an arrow d in fig. 9. The dust cup 61 is provided with an opening/closing device 65 for closing or opening the secondary dust outlet 611. In this embodiment, the opening and closing device 65 is automatically sealed under the action of negative pressure or elastic reset force after starting up, and automatically opened under the action of dust gravity after stopping. Here, the opening and closing device 65 is a film structure movably provided on the dust cup 61, and the film may be made of a rubber sheet or the like. Of course, in other embodiments, the opening and closing device 65 may be opened or closed by a sensing device or a control device controller.
In addition, in other embodiments, the dust cup 61 may not be provided with a secondary dust outlet, so that dust in the dust cup 61 does not enter the dust barrel 10, and the dust in the dust cup 61 needs to be poured out after the dust cup 61 is removed from the dust barrel 10.
In this embodiment, the upper edge of the dust cup 61 is formed with an assembly collar 612 that is assembled with the dust bucket 10, the assembly collar 612 being locked with the dust bucket 10 by a snap-fit arrangement (not numbered). Of course, in other embodiments, the dust cup 61 may be directly placed in the dust bucket 10, and a limiting structure is provided in the dust bucket 10 to fix the dust cup 61, where the limiting structure forms a step structure in the interior of the dust bucket 10, and the dust cup 61 is limited by the step structure. However, this way will increase the structure of the dust barrel 10, making the dust barrel 10 complex, and the limit structure will make the dust barrel 10 have dust accumulation area, which affects the dust output effect. The dirt cup 61 extends downwardly from the mounting collar 612 to form a barrel-like structure to facilitate assembly of the dirt cup 61 with the dirt bucket 10.
The number of the secondary cylinders 63 is 6 to 12, preferably 8 to 10. An air inlet 632 is formed in the secondary cylinder 63, the air inlet 632 being located outside the dirt cup 61 and adjacent to the upper seal plate 62, the air inlet 632 being located on the underside of the upper seal plate 62. An air inlet passage 661 communicating with the plurality of air inlets 632 is formed in the secondary separation device 60, and the air inlet passage 661 is arranged below the upper seal plate 62. An air inlet end (not numbered) of the air inlet channel 661 is abutted with an air outlet 733 of the first air outlet pipe body 741. In the present embodiment, the air outlet 733 of the first air outlet pipe body 741 is not the air outlet of the filtering device 200. The upper sealing plate 62 is provided with openings 621 corresponding to the plurality of secondary cylinders 63, and an air outlet channel 662 is formed between the upper sealing plate 62 and the secondary cylinder cover 64 and is arranged above the upper sealing plate 62. The aperture 621 communicates with the outlet passage 662.
After the gas enters the secondary separation device 60 from the first air outlet pipe body 741, the gas enters the secondary cylinder 63 from the air inlet 632 of each secondary cylinder 63 through the air inlet channel 661, so that dust in the gas is separated and falls into the dust cup 61 from the dust falling port 631, the separated gas enters the air outlet channel 662 from the opening 621, and the dotted line with an arrow in fig. 9 indicates the flow direction of the gas in the filtering device 200.
The cyclone generator cylinder 72 is located at one side of the dust cup 61, and the dust outlet 732 of the cyclone separation device 70 is directly abutted with the dust barrel cavity 11, so that dust in the cyclone separation cavity 71 directly enters the dust barrel cavity 11 at the dust outlet 732 (the direction indicated by the arrow c in fig. 9 is the dust outlet direction of the dust outlet 732). In order to more evenly distribute the air flow into the secondary barrels 63, a number of secondary barrels 63 are arranged in a fan shape around the circumference of the cyclone generator barrel 72. Of course, the layout of the secondary cylinder 63 may take other forms, such as linear, circular, and the corresponding airflow distribution paths must be designed. The axis of the secondary cylinder 63 is parallel to the axis of the first air outlet pipe body 741, and the openings of the secondary cylinders 63 face and are close to the first air outlet pipe body 741, so that the length of the air inlet channel 661 is shortened, the energy loss of air in the air inlet channel 661 is reduced, and the dust removing effect is improved.
The dust cup 61 is provided with a primary dust outlet channel 76 communicated with the dust outlet 732, namely, the dust cup 61 is internally divided into a dust cup cavity 611 and the primary dust outlet channel 76. By forming the dirt cup chamber 613 and the primary dirt outlet passage 76 separately within the dirt cup 61, rapid disassembly and assembly of the filter apparatus 200 is facilitated as compared to a split arrangement of the dirt cup 61 and the primary dirt outlet passage 76.
The cyclone separation device 70 is partially located in the primary dust outlet channel 76 and the secondary drum 63 is partially located in the dust cup chamber 613, wherein the air inlet 632 of the secondary drum 63 is located above the dust cup chamber 613. The dirt cup chamber 613 and the primary dirt outlet passage 76 are both located within the dirt cup chamber 11, and the dirt outlet 732 of the cyclonic separating apparatus 70 is located within the primary dirt outlet passage 76. In this embodiment, the outlet 761 of the primary dust outlet channel 76 and the secondary dust outlet 611 are arranged in parallel.
In this embodiment, the dust cap assembly 50 includes a lower cap 51 and an upper cap 52 that are spliced into a cyclone generator barrel 72. The lower cover 51 and the upper cover 52 enclose a cyclone separating chamber 71, a second air outlet pipe body 742 is located in the cyclone separating chamber 71, and a first air outlet pipe body 741 is formed on the upper cover 52, outside the cyclone separating chamber 71, and below the upper sealing plate 62 to be in butt joint with an air inlet (not numbered) of the air inlet channel 661.
The upper cover 52 has a suction duct 40 formed thereon, the axis of the suction duct 40 being tangential or substantially tangential to the cyclone generator cylinder 72. The dust suction duct 40 forms an air inlet 731 of the cyclone separating apparatus 70, i.e., the air inlet 731 of the filtering apparatus 200.
To facilitate installation of the dust cap assembly 50, the dust cap assembly 50 further includes a cap frame 54, and the lower cap 51 and the upper cap 52 are mounted on the cap frame 54. The cover holder 54 is detachably mounted on the dirt cup 61, in particular, the lower cover 51 is placed on the mounting collar 612 of the dirt cup 61, and the lower cover 51 and the mounting collar 612 are locked by a snap-fit structure (not numbered). The fastening structure can be the same as the structure for locking the lower cover and the dust barrel in the previous embodiment, and can also be the structure disclosed in the present embodiment: the lower cover 51 is provided with a clip 511, and the fitting collar 612 is formed with a catch 615 that mates with the clip 511. Of course, in other embodiments, the lower cover 51 may be directly locked to the dust bucket 10, for example, the dust cup 61 is located in the dust bucket 10, the lower cover 51 is directly assembled to the dust bucket 10, or the length of the buckle 511 on the lower cover 51 is increased, and the engaging part 615 is directly arranged on the dust bucket 10.
In this embodiment, the secondary cylinder 63 is secured to the dirt cup by the cover frame 54. The cover frame 54 has a first mounting portion 541 for mounting the cyclone cylinder 72 and a second mounting portion 541 for mounting the secondary cylinder 63. The cover frame 54 is provided with sealing structures (not numbered) at the first mounting portion 541 and the second mounting portion 542 to improve sealing performance. Further, seals (not numbered) are provided between the cover frame 54 and the dirt cup 61, and between the dirt cup and the dirt drum 10. The dust cap assembly 50 further includes a top cover 53, wherein the top cover 53 is located above the dust suction duct 40 and shields the dust suction duct 40 above, and of course, in order to facilitate docking with an external device, the top cover 53 shields the dust suction duct entirely, and in this embodiment, the portion of the dust suction duct 40 that is docked with the external device is not shielded by the top cover 53. The top cover 53 is disposed on the secondary cylinder cover 64, the top cover 53 is formed with the air outlet pipe 54, the air outlet channel 662 is communicated with the air outlet pipe 54, and the air separated by the secondary separation device 60 is discharged from the air outlet pipe 54. In this embodiment, the outer opening of the air outlet pipe 54 is the air outlet 201 of the filtering device 200.
Referring to fig. 10 and 11, the industrial cleaner 800 of the present embodiment includes a filter device 81 and an airflow generating device 82, and the airflow generating device 82 is configured to suck air from an air inlet (not numbered) to generate an airflow. The structure of the filter device 81 may be the same as that of the first embodiment or the second embodiment, and in this embodiment, the structure of the filter device 81 is substantially the same as that of the second embodiment, and a detailed description thereof will not be given here.
In this embodiment, the airflow generating device 82 includes a motor 821 and a fan 822 driven by the motor 821, which is mounted on the dust bin cover assembly 811 above the dust bin 812. Of course, in other embodiments, the airflow generating device 82 may be located elsewhere, such as between the cyclonic separating apparatus 813 and the secondary separating apparatus 814, or within the dust bin 812, so long as it is capable of generating airflow by drawing air from the air inlet. Of course, since the gas flow generating device 82 is disposed at the rear side of the secondary separation device 814, the arrangement of this embodiment makes the gas flowing through the gas flow generating device 82 less contaminated, contributing to the prolongation of the service life of the gas flow generating device 82.
More than 95% of the dust in the gas will be filtered through the cyclone 813 and the secondary 814 separation units in the filter unit 81, while the industrial cleaner 800 further comprises a tertiary separation unit 83 connected to the secondary 814 separation unit for better cleaning. With this arrangement, the remaining dust will be separated and filtered in the three-stage separator 83, and the total filtration efficiency of the filtration will be over 99.97%.
The three-stage separator 83 is connected to the motor 821, and the airflow generator 82 is located at the rear side of the three-stage separator 83 in the flow direction of the air, and the three-stage separator 83 is arranged above the dust cap assembly 811 in series with the motor 821, with the axis (not shown) of the motor 821 being perpendicular to the height direction of the dust barrel 812. The three-stage separator 83, motor 821, cyclone separator 813, and secondary separator 814 are combined to form a negative pressure working head of the industrial cleaner 800.
By arranging the tertiary separation device 83 in series with the motor 821 and above the dust bucket cover assembly 811, it is possible to not occupy the effective volume of the dust bucket 812, and it is also possible to further lower the dust bucket height and center of gravity by inverting the negative pressure working head (including the tertiary separation device 83, the motor 821, the cyclone separation device 813 and the secondary separation device 814) within the dust bucket 812 during transportation and storage.
The dotted line with an arrow in fig. 11 is the flowing direction of the gas in the industrial cleaner 800, the negative pressure is generated in the industrial cleaner 800 by the airflow generating device 82, so that the external gas enters the cyclone separating device 813 from the air inlet, the first air purification is performed in the cyclone separating device 813, the dust in the gas enters the dust barrel 812 after being separated (the direction indicated by the arrow c in fig. 9 is the dust outlet direction of the cyclone separating device 813), the gas after the first purification enters the second separating device 814, the second air purification is realized, the dust in the gas falls into the dust cup (not shown) along the arrow d direction, the gas after the second purification flows through the third separating device 83, the air purified for the third time is discharged to the outside through the fan 822. The most reasonable cyclone separator 813 is determined through dust material diameter analysis and practical operation test: the filtration ratio of the secondary separation device 814 is 5:1 to 20:1, preferably 8:1 to 12:1; secondary separation device 814: the filtration ratio of the three-stage separation device 83 is 5:1 to 15:1, preferably 8:1 to 12:1.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.