An energy-saving and noise-reducing vacuum cleaner

Abstract

The present invention discloses an energy-saving and noise-reducing vacuum cleaner, which includes a vacuum cleaner housing and a dust cup. An initial separation unit is provided at the right end of the dust cup. A first filter cover is arranged inside the initial separation unit. A cyclone separator is arranged inside the isolation cover. The cyclone separation unit includes a three-stage separation unit. The first separation unit includes a hollow impeller and an internal abutting structure. A first guiding groove is provided on the second separation unit, and a second guiding groove is provided on the third separation unit. A second filter cover is sleeved on the side wall of the cyclone separator. A second vortex fan is arranged on the right side of the isolation cover. The vacuum cleaner housing is provided with an exhaust hole and an air outlet sponge. Through the design of segmented separation of particulate dust, the present invention realizes efficient collection of dust and hair. Combined with a variety of noise-reducing structures such as a vortex fan, a turbulent flow structure, the multi-blade impeller design of the first separation unit, and an air outlet sponge, etc., which do not require power supply, the vacuum cleaner can achieve efficient noise reduction and meet the requirements of energy saving of the vacuum cleaner.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum cleaners, and specifically to an energy-saving and noise-reducing vacuum cleaner. Background Art

[0002] At present, the methods for reducing noise in vacuum cleaners on the market are relatively single. Most of them are to increase filter components such as sponges to reduce noise, and the effect is average. And some structures designed specifically for noise reduction problems require power supply functions, resulting in additional power requirements, making the internal circuit layout design of the vacuum cleaner more complex and unable to meet the product requirements of energy-saving and noise reduction. In addition, through the cyclone separator, dust of different particle sizes and surface shapes is separated at one time. When the particles spiral upward with the airflow, the particles collide frequently, making the airflow more unstable, and also increasing the eddy current noise and rotational noise. Summary of the Invention

[0003] The purpose of the present invention is to provide an energy-saving and noise-reducing vacuum cleaner to solve the problems that the noise reduction method of the vacuum cleaner is single, mostly by increasing filter components such as sponges, and the noise reduction effect is average. And some noise reduction structures require power supply, resulting in additional power requirements and more complex internal circuit layout design of the vacuum cleaner, unable to meet the product requirements of energy-saving and noise reduction. And through the one-time separation design of the cyclone separator for dust of different particle sizes and surface shapes, when the particles spiral upward with the airflow, the particles collide frequently, making the airflow more unstable, and also increasing the eddy current noise and rotational noise.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions: An energy-saving and noise-reducing vacuum cleaner includes a vacuum cleaner housing. A dust suction port is provided at the left end of the vacuum cleaner housing. A dust cup is snap-connected to the bottom of the vacuum cleaner housing. An initial separation unit is provided at the right end of the dust cup. The initial separation unit is conical and a first filter cover is provided inside the left end thereof. An isolation cover is provided at the right end of the initial separation unit. An inlet structure is provided at the front end of the isolation cover. A cyclone separator is provided inside the isolation cover. A cyclone separation unit is provided in the cyclone separator through a motor. The cyclone separation unit includes a first separation unit, a second separation unit, and a third separation unit with a coaxial air hole in the center, and a support bracket and a base that sleeve on the first separation unit, the second separation unit, and the third separation unit and fix them. The first separation unit includes a hollow impeller and an internal abutting structure. The second separation unit is provided with a plurality of first guiding grooves radiating outward equidistantly along the edge of the air hole. The third separation unit is provided with a plurality of second guiding grooves radiating outward equidistantly along the edge of the air hole. A second filter cover is sleeved on the side wall of the cyclone separator. A second vortex fan is provided on the right side of the isolation cover. An exhaust hole is provided at the corresponding position of the second vortex fan on the vacuum cleaner housing. A battery pack is provided at the right end of the vacuum cleaner housing.

[0005] As a further description of the above technical solution:

[0006] A partition board is hinged on the air passage inside the dust suction port, and a limiting convex part is arranged at the left end of the air passage by the partition board.

[0007] As a further description of the above technical solution:

[0008] The dust cup is a groove-shaped dust cup. A first vortex fan and a turbulization structure are sequentially arranged in the primary separation unit from left to right. The turbulization structure is a metal mesh structure. The primary separation unit is fixed on the dust cup. The bottom of the dust cup is inserted into the bottom of the vacuum cleaner housing, and the upper end of the primary separation unit is clamped at the left end of the isolation cover.

[0009] As a further description of the above technical solution:

[0010] The inlet structure is a convex structure and a plurality of air inlets radiate outward along its axis. The size of the turbulization structure is not less than the size of the inlet structure.

[0011] As a further description of the above technical solution:

[0012] The left end of the cyclone separator abuts against the left end of the inner wall of the isolation cover, and its right end abuts against the conical surface at the right end of the inner wall of the isolation cover through a conical structure.

[0013] As a further description of the above technical solution:

[0014] The abutting structure includes a gas guide cylinder and a support rod arranged between the gas guide cylinder and the hollow impeller. The support rod is an inclined rod that continuously moves away from the axis of the hollow impeller from left to right or an arc rod with a concave surface facing the second separation unit.

[0015] As a further description of the above technical solution:

[0016] The second separation unit is connected to the base through a plurality of second mounting structures. An open section is arranged at one end of the first guide groove close to the air hole, and an outlet is arranged at the other end.

[0017] As a further description of the above technical solution:

[0018] The support bracket and the base are connected through a plurality of first mounting structures. The plurality of first mounting structures are arranged around the third separation unit and fixed on its side wall. The second guide groove is an arc groove and the concave surface faces the second separation unit.

[0019] As a further description of the above technical solution:

[0020] An air outlet sponge is attached to the inner wall of the vacuum cleaner housing at the corresponding position of the exhaust hole. The size of the air outlet sponge is not less than the distribution range of the exhaust holes. An observation window is arranged on the vacuum cleaner housing at the corresponding position of the dust cup.

[0021] As a further description of the above technical solution:

[0022] The first turbofan, the turbulizing structure, the inlet structure, the first separation unit, the second separation unit, the third separation unit, and the second turbofan are coaxially arranged.

[0023] In summary, due to the adoption of the above technical solutions, the present invention has the following beneficial effects compared with the prior art:

[0024] 1. The vacuum cleaner screens out hair and dust through the first filter cover. The cyclone separation unit captures and removes particles with different particle sizes and shapes by segmenting the rotation radius of the spiral airflow, and is adsorbed and captured by the second filter cover. The clean airflow is discharged from the exhaust holes on both sides of the vacuum cleaner.

[0025] 2. The cyclone separation unit is driven by the motor to rotate, generating negative pressure inside the vacuum cleaner, which drives the isolation plate to turn inward, connecting the suction port with the inside of the vacuum cleaner, and dust, hair, etc. are sucked in through the suction port. The first turbofan can disrupt the airflow to reduce its flow velocity. The turbulizing structure is arranged at the outlet of the first turbofan, immediately converting the laminar boundary layer on the back of the blade into a turbulent boundary layer, delaying or preventing the separation of the boundary layer on the back of the blade, making the airflow velocity and pressure gradient quickly become uniform, and further improving the noise reduction effect. The first separation unit increases its aerodynamic load through the design of a multi-blade impeller, greatly reducing the noise. The second turbofan further reduces the speed to reduce the noise generated by friction and collision with components. The design of segmental removal of particulate dust can greatly reduce the collision of particles with different particle sizes and shapes in the cyclone separation unit, thereby ensuring stable airflow and reducing eddy current noise and rotational noise. The corresponding air outlet sponge in the exhaust hole is used for isolation and small-hole air outlet noise reduction. The above noise reduction design of the vacuum cleaner does not require power supply, and while playing a role in noise reduction, it has an obvious energy-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0027] Figure 1 It is an exploded view of an energy-saving and noise-reducing vacuum cleaner.

[0028] Figure 2 It is a perspective view of an energy-saving and noise-reducing vacuum cleaner.

[0029] Figure 3 It is a front sectional view of an energy-saving and noise-reducing vacuum cleaner.

[0030] Figure 4It is a schematic structural diagram of the first separation unit in an energy-saving and noise-reducing vacuum cleaner.

[0031] Figure 5 It is a schematic structural diagram of the second separation unit in an energy-saving and noise-reducing vacuum cleaner.

[0032] Figure 6 It is a schematic structural diagram of the third separation unit in an energy-saving and noise-reducing vacuum cleaner.

[0033] Legend Explanation:

[0034] 1. Vacuum cleaner housing; 11. Exhaust hole; 12. Air outlet sponge; 13. Observation window; 2. Suction port; 21. Partition board; 3. Dust cup; 4. Primary separation unit; 41. First filter cover; 42. First vortex fan; 43. Turbulence structure; 5. Isolation cover; 51. Inlet structure; 52. Second vortex fan; 6. Cyclone separator; 61. Cyclone separation unit; 611. First separation unit; 6111. Hollow impeller; 6112. Contact structure; 612. Second separation unit; 6121. First guiding groove; 613. Third separation unit; 6131. Second guiding groove; 614. Support bracket; 615. Base; 6151. First mounting structure; 6152. Second mounting structure; 62. Motor; 63. Second filter cover; 7. Battery pack. Detailed Implementation Manner

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0036] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0037] Embodiment 1:

[0038] Please refer to Figure 1-6, the present invention provides a technical solution: an energy-saving and noise-reducing vacuum cleaner, which includes a vacuum cleaner housing 1. A dust suction port 2 is provided at the left end of the vacuum cleaner housing 1. A dust cup 3 is snap-connected to the bottom of the vacuum cleaner housing 1. An initial separation unit 4 is provided at the right end of the dust cup 3. The initial separation unit 4 is conical and a first filter cover 41 is provided on the inner side of its left end. An isolation cover 5 is provided at the right end of the initial separation unit 4. An inlet structure 51 is provided at the front end of the isolation cover 5. A cyclone separator 6 is provided inside the isolation cover 5. A cyclone separation unit 61 is provided inside the cyclone separator 6 through a motor 62. The cyclone separation unit 61 includes a first separation unit 611, a second separation unit 612, a third separation unit 613 with coaxial air holes provided in the center, and a support bracket 614 and a base 615 that are sleeved on the first separation unit 611, the second separation unit 612, and the third separation unit 613 and fix them. The first separation unit 611 includes a hollow impeller 6111 and an internal abutting structure 6112. The second separation unit 612 is provided with a plurality of first guiding grooves 6121 that radiate outward equidistantly along the edge of the air hole. The third separation unit 613 is provided with a plurality of second guiding grooves 6131 that radiate outward equidistantly along the edge of the air hole. A second filter cover 63 is sleeved on the side wall of the cyclone separator 6. A second vortex fan 52 is provided on the right side of the isolation cover 5. An exhaust hole 11 is provided in the vacuum cleaner housing 1 at the corresponding position of the second vortex fan 52. A battery pack 7 is provided at the right end of the vacuum cleaner housing 1. This vacuum cleaner screens out hairs and dust through the first filter cover. The cyclone separation unit captures and removes particles of different particle sizes and shapes according to the rotation radius of the spiral airflow in segments, and is adsorbed and captured by the second filter cover. The clean airflow is discharged from the exhaust holes on both sides of the vacuum cleaner, and a variety of structures that do not require power supply are built in to reduce the noise of the vacuum cleaner, which has an obvious energy-saving effect.

[0039] Specifically, an isolation plate 21 is hinged on the air duct inside the dust suction port 2. A limiting protrusion is provided at the left end of the air duct on the isolation plate 21 to isolate the dust cup and facilitate its flipping open under the negative pressure environment during dust suction.

[0040] Specifically, the inlet structure 51 is a convex structure and a plurality of air inlets radiate outward along its axis. The size of the turbulizing structure 43 is not less than the size of the inlet structure 51, which ensures stable air intake of the structure and at the same time, seals and isolates the cyclone separation unit and the dust cup.

[0041] Specifically, the left end of the cyclone separator 6 abuts against the left end of the inner wall of the isolation cover 5, and its right end abuts against the conical surface at the right end of the inner wall of the isolation cover 5 through a conical structure, ensuring the stable fixation of the cyclone separator.

[0042] Specifically, the abutting structure 6112 includes an air guide cylinder and a support rod disposed between the air guide cylinder and the hollow impeller 6111. The support rod is an inclined rod that continuously moves away from the axis of the hollow impeller 6111 from left to right or an arc-shaped rod with a concave surface facing the second separation unit 612, ensuring the structural strength and buffering toughness of the first separation unit.

[0043] Specifically, the second separation unit 612 is connected to the base 615 through a plurality of second mounting structures 6152. An open section is provided at one end of the first guide groove 6121 close to the air hole, and an outlet is provided at the other end, facilitating the capture of particles with a medium spiral rising radius.

[0044] Specifically, the support bracket 614 and the base 615 are connected through a plurality of first mounting structures 6151. The plurality of first mounting structures 6151 are arranged around the third separation unit 613 and fixed on its side wall. The second guide groove 6131 is an arc-shaped groove with a concave surface facing the second separation unit 612.

[0045] Specifically, an air outlet sponge 12 is attached to the inner wall of the vacuum cleaner housing 1 at the corresponding position of the exhaust hole 11. The size of the air outlet sponge 12 is not less than the distribution range of the exhaust hole 11. An observation window 13 is provided on the vacuum cleaner housing 1 at the corresponding position of the dust cup 3, for isolation and noise reduction by small-hole air outlet, and facilitating the observation of the accumulation of hair and dust in the dust cup to remind cleaning.

[0046] The first vortex fan 42, the turbulent flow structure 43, the inlet structure 51, the first separation unit 611, the second separation unit 612, the third separation unit 613, and the second vortex fan 52 are coaxially arranged, making the air flow more stable and reducing noise.

[0047] Embodiment 2:

[0048] Please refer to Figure 1 、 3 On the basis of the above Embodiment 1, preferably, the dust cup 3 is a trough-shaped dust cup. A first vortex fan 42 and a turbulent flow structure 43 are sequentially arranged in the primary separation unit 4 from left to right. The turbulent flow structure 43 is a metal mesh structure. The primary separation unit 4 is fixed on the dust cup 3. The bottom of the dust cup 3 is inserted into the bottom of the vacuum cleaner housing 1. The upper end of the primary separation unit 4 is clamped to the left end of the isolation cover 5. The turbulent flow structure 4 is disposed at the outlet of the first vortex fan 42, immediately converting the laminar boundary layer on the back of the blade into a turbulent boundary layer, delaying or preventing the separation of the boundary layer on the back of the blade, and making the air flow velocity and pressure gradient quickly become uniform, further improving the noise reduction effect.

[0049] The working principle of an energy-saving and noise-reducing vacuum cleaner according to this embodiment includes: pressing the vacuum cleaner switch, and the battery pack 7 supplies energy, causing the motor 62 to drive the cyclone separation unit 61 to rotate, generating negative pressure in the cyclone separation unit 61, the turbulent flow structure 43, the primary separation unit 4, and the dust cup 3, driving the isolation plate 21 to flip inward, connecting the suction port 2 with the interior of the vacuum cleaner, and forming a negative pressure environment. Dust, hair, etc. are sucked in through the suction port 2, and through the first filter cover 41, hair and large-particle dust are screened out and fall into the dust cup 3 along the first filter cover 41. The air drives the fine-particle dust to flow to the first vortex fan 42, flows along its blades through the turbulent flow structure 4, and flows into the cyclone separator 6 through the inlet structure 51. The vortex fan can disrupt the air flow to reduce its flow rate and improve the noise reduction effect. The turbulent flow structure 4 is arranged at the outlet of the first vortex fan 42, immediately converting the laminar boundary layer on the back of the blade into a turbulent boundary layer, delaying or preventing the separation of the boundary layer on the back of the blade, making the air flow velocity and pressure gradient quickly become uniform, and further improving the noise reduction effect. Through the rotation of the cyclone separation unit 61, the segmented removal of fine-particle dust is achieved. Particles form a centrifugal force driven by the air flow and their own gravity, and particles with a greater gravity than the air flow thrust and resistance are thrown out of the cyclone separation unit 61 along the blades of the hollow impeller 6111 and the guiding action of the support bracket 614 and are adsorbed and captured by the second filter cover 63. The first separation unit 611 reduces the noise greatly by increasing its aerodynamic load through the design of a multi-blade impeller. Particles with a medium spiral rising radius are captured by the first guiding groove 6121 of the second separation unit 612, are thrown out of the second separation unit 612 along its guiding structure, and are adsorbed and captured by the second filter cover 63. The remaining particles with a smaller spiral rising radius are captured and thrown out by the second guiding groove 6131 on the third separation unit 613 and are adsorbed and captured by the second filter cover 63. The clean air flows out of the cyclone separation unit 61 through the through holes, and the speed is further reduced by disrupting the air flow through the second vortex fan 52 to reduce the noise generated by friction and collision with components. The design of the segmented removal of particle dust can greatly reduce the collision of particles with different particle sizes and shapes in the cyclone separation unit, thereby ensuring the stability of the air flow, reducing the eddy current noise and rotational noise. Finally, the air flow is discharged from the vacuum cleaner through the exhaust holes 11 on both sides of the vacuum cleaner. During this period, the corresponding air outlet sponge 12 in the exhaust holes 11 conducts isolation and small-hole air outlet noise reduction. The above-mentioned noise reduction design of the vacuum cleaner does not require power supply, achieving noise reduction while having an obvious energy-saving effect.

[0050] In summary, due to the adoption of the above technical solutions, an energy-saving and noise-reducing vacuum cleaner according to this embodiment has the following beneficial effects compared with the prior art:

[0051] 1. The vacuum cleaner screens out hair and dust through the first filter cover. The cyclone separation unit captures and removes particles of different particle sizes and shapes in segments according to the rotation radius of the spiral airflow, and is adsorbed and captured by the second filter cover. The clean airflow is discharged from the exhaust holes on both sides of the vacuum cleaner.

[0052] 2. The motor drives the cyclone separation unit to rotate, generating negative pressure inside the vacuum cleaner, which drives the isolation plate to turn inward, connecting the suction port with the inside of the vacuum cleaner. Dust, hair, etc. are sucked in through the suction port. The first vortex fan can disrupt the airflow to reduce its flow velocity. The turbulent flow structure is arranged at the outlet of the first vortex fan, immediately converting the laminar boundary layer on the back of the blade into a turbulent boundary layer, delaying or preventing the separation of the boundary layer on the back of the blade, making the airflow velocity and pressure gradient quickly become uniform, and further improving the noise reduction effect. The first separation unit increases its aerodynamic load through the design of a multi-blade impeller, greatly reducing the noise. The second vortex fan further disrupts and reduces the speed to reduce the noise generated by friction and collision with components. The design of segmental removal of particulate dust can also greatly reduce the collision of particles of different particle sizes and shapes in the cyclone separation unit, thereby ensuring stable airflow and reducing eddy current noise and rotational noise. The corresponding air outlet sponge in the exhaust hole isolates and reduces noise through small-hole air outlet. The above noise reduction design of the vacuum cleaner does not require power supply, playing a role in noise reduction and having an obvious energy-saving effect at the same time.

[0053] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, should be covered by the protection scope of the present invention.

Claims

1. An energy-saving and noise-reducing vacuum cleaner, characterized in that, it includes a vacuum cleaner housing (1), a dust suction port (2) is arranged at the left end of the vacuum cleaner housing (1), a dust cup (3) is snap-connected to the bottom of the vacuum cleaner housing (1), and a primary separation unit (4) is arranged at the right end of the dust cup (3). The primary separation unit (4) is conical and a first filter cover (41) is arranged on the inner side of its left end. An isolation cover (5) is arranged at the right end of the primary separation unit (4). An inlet structure (51) is arranged at the front end of the isolation cover (5). A cyclone separator (6) is arranged inside the isolation cover (5). A cyclone separation unit (61) is arranged inside the cyclone separator (6) through a motor (62). The cyclone separation unit (61) includes a first separation unit (611), a second separation unit (612), a third separation unit (613) with coaxial air holes arranged in the center, and a support bracket (614) and a base (615) that are sleeved on the first separation unit (611), the second separation unit (612) and the third separation unit (613) and fix them. The first separation unit (611) includes a hollow impeller (6111) and an internal abutting structure (6112). The second separation unit (612) is provided with a plurality of first guiding grooves (6121) radiating outward equidistantly along the edge of the air hole. The third separation unit (613) is provided with a plurality of second guiding grooves (6131) radiating outward equidistantly along the edge of the air hole. A second filter cover (63) is sleeved on the side wall of the cyclone separator (6). A second vortex fan (52) is arranged on the right side of the isolation cover (5). An exhaust hole (11) is arranged at the corresponding position of the vacuum cleaner housing (1) for the second vortex fan (52). A battery pack (7) is arranged at the right end of the vacuum cleaner housing (1). An isolation plate (21) is hinged on the air duct inside the dust suction port (2). A limiting convex portion is arranged at the left end of the air duct for the isolation plate (21). A first vortex fan (42) and a turbulent flow structure (43) are arranged in the primary separation unit (4) in sequence from left to right. The turbulent flow structure (43) is a metal mesh structure. The primary separation unit (4) is fixed on the dust cup (3). The bottom of the dust cup (3) is inserted into the bottom of the vacuum cleaner housing (1). The upper end of the primary separation unit (4) is snap-connected to the left end of the isolation cover (5).

2. The energy-saving and noise-reducing vacuum cleaner according to claim 1, characterized in that, the inlet structure (51) is a convex structure and a plurality of air inlets radiate outward along its axis, and the size of the turbulent flow structure (43) is not less than the size of the inlet structure (51).

3. The energy-saving and noise-reducing vacuum cleaner according to claim 1, characterized in that, the left end of the cyclone separator (6) abuts against the left end of the inner wall of the isolation cover (5), and its right end abuts against the conical surface at the right end of the inner wall of the isolation cover (5) through a conical structure.

4. The energy-saving and noise-reducing vacuum cleaner according to claim 1, characterized in that, The abutting structure (6112) includes an air guide cylinder and a support rod disposed between the air guide cylinder and the hollow impeller (6111), and the support rod is an inclined rod that continuously moves away from the axis of the hollow impeller (6111) from left to right or an arc rod with a concave surface facing the second separation unit (612).

5. The energy-saving and noise-reducing vacuum cleaner according to claim 1, wherein, The second separation unit (612) is connected to the base (615) through a plurality of second mounting structures (6152), and an open section is provided at one end of the first guide groove (6121) close to the air hole while an outlet is provided at the other end thereof.

6. The energy-saving and noise-reducing vacuum cleaner according to claim 1, wherein, The support bracket (614) and the base (615) are connected through a plurality of first mounting structures (6151), and the plurality of first mounting structures (6151) are arranged around the third separation unit (613) and fixed on its side wall, and the second guide groove (6131) is an arc groove with a concave surface facing the second separation unit (612).

7. The energy-saving and noise-reducing vacuum cleaner according to claim 1, wherein, An air outlet sponge (12) is attached to the inner wall of the vacuum cleaner housing (1) at a corresponding position of the exhaust hole (11), the size of the air outlet sponge (12) is not less than the distribution range of the exhaust hole (11), and an observation window (13) is provided on the vacuum cleaner housing (1) at a corresponding position of the dust cup (3).

8. The energy-saving and noise-reducing vacuum cleaner according to claim 1, wherein, The first vortex fan (42), the turbulence structure (43), the inlet structure (51), the first separation unit (611), the second separation unit (612), the third separation unit (613), and the second vortex fan (52) are coaxially arranged.

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