CN111437670B - air purifier - Google Patents

Abstract

The present invention provides an air purifier, comprising: a casing, on which an indoor air inlet and an air outlet are arranged; a filter element, arranged in the casing, and indoor air enters the casing from the indoor air inlet and reaches The filter element is used for filtering; the fresh air system is connected to the housing and has an outdoor air inlet through which outdoor air enters the housing; and a laminar flow fan is arranged in the housing and forms a The air inlet passage, the indoor air filtered by the filter element and/or the outdoor air entering the housing reaches the air inlet passage, and the laminar flow fan reaches the air inlet through the disturbance of the fluid viscosity effect The air in the channel forms a laminar flow, and the laminar flow is discharged from the casing through the air outlet. In the air purifier of the present invention, a laminar flow fan and a fresh air system are provided in the casing, thereby effectively improving user experience.

Description

air purifier

technical field

The invention relates to the technical field of air purification, in particular to an air purifier.

Background technique

With the rapid development of the economy, the massive consumption of energy produces a large amount of harmful substances. The earth where people live is full of particulate matter, sulfur oxides, nitrogen oxides and hydrocarbons, which seriously threaten people's health. In order to make the air fresh, an air purifier is needed to purify the air. At present, air purifiers mainly use centrifugal fans or axial fans to supply air in one direction, resulting in high air supply noise. Under the limitation of performance indicators, the noise value is close to the limit. At the same time, the existing air purifiers generally only process indoor air, without the function of supplementing fresh air. In addition, most users think that the clean air generated by existing air purifiers cannot be evenly distributed in a room or a closed space, which has a certain distribution limitation.

Contents of the invention

One object of the present invention is to provide an air purifier which utilizes laminar flow fan to supply air, utilizes both indoor air and outdoor air, has low noise, high air volume and high wind pressure.

A further object of the present invention is to use a laminar flow fan to supply air after filtering the outdoor air.

A further object of the present invention is to prevent the air from the air purifier from blowing directly to the user, so as to improve the user experience.

The invention provides the following technical solutions:

An air purifier comprising:

The housing is provided with an indoor air inlet and an air outlet;

The filter element is set in the casing, and the indoor air enters the casing from the indoor air inlet and then reaches the filter element for filtering;

The fresh air system is connected to the housing and has an outdoor air inlet through which outdoor air enters the housing; and

The laminar flow fan is set in the housing, which forms an air inlet channel, the indoor air filtered by the filter element and/or the outdoor air entering the housing reaches the air inlet channel, and the laminar flow fan reaches the air inlet channel through the disturbance of the fluid viscosity effect The air forms a laminar wind, and the laminar wind is discharged from the housing through the air outlet.

Optionally, the fresh air system includes: a fresh air duct, the first end of which is located outdoors, an outdoor air inlet is provided, and the second end extends into the casing; and a centrifugal fan, outdoor air enters the fresh air duct through the outdoor air inlet and is driven by the centrifugal fan to move into the case.

Optionally, the fresh air system further includes: a volute with an inlet and an outlet; a centrifugal fan is arranged in the volute, which drives outdoor air into the volute from the inlet, turns around in the volute, and enters the casing from the outlet.

Optionally, the fresh air system further includes: a fresh air filter element arranged in the fresh air duct, and the centrifugal fan drives the outdoor air filtered by the fresh air filter element into the volute from the inlet.

Optionally, an air channel plate is provided in the housing, and the air channel plate is configured to form an air channel with at least a part of the filter element; the outlet of the volute is communicated with the air channel, so that the outdoor air enters the air channel after being discharged from the outlet and passes through the air channel. After filtering by the filter element, it reaches the air inlet channel.

Optionally, laminar flow fans include:

The laminar flow fan includes a plurality of annular disks, which are arranged in parallel with each other at intervals, have the same central axis and form an air inlet channel in the center, and the air entering the air inlet channel reaches the space between the plurality of annular disks. clearance; and

The motor is connected to the laminar flow fan and is configured to drive a plurality of annular disks to rotate, so that the air boundary layer close to the surface of the plurality of annular disks is driven by the rotating plurality of annular disks to rotate from inside to outside to form a laminar flow.

Optionally, a laminar fan and a motor are arranged in the upper part of the housing; an air outlet is provided on the upper part of the housing corresponding to the position of the laminar fan; the filter element is an annular filter element, which is vertically arranged below the laminar fan; An accommodating cavity is formed below the filter element, and the centrifugal fan and the volute are arranged in the accommodating cavity, and the opening of the outlet of the volute is upward.

Optionally, the laminar flow fan further includes: a driving disc, arranged in parallel with the plurality of annular discs at intervals; Disc; the motor is configured to directly drive the disc to rotate, and then the drive disc drives a plurality of annular discs to rotate.

Optionally, the driving disc is formed with a recessed portion toward a plurality of annular discs at its center; the air cleaner also includes: a fixing mechanism, arranged in the housing, which includes a fixing plate and a fixing frame, and the motor is arranged on the fixing plate and the fixing frame. Between the frames; wherein the fixed frame has a main body and a claw extending from the main body toward the fixed plate; the main body is provided with a through hole, and the output shaft of the motor extends out of the fixed frame through the through hole and is connected with the laminar flow fan; The claws are used for fixing with the fixing plate and matched with the recesses.

Optionally, the connecting part is a blade, and the cross section of the blade has double circular arcs protruding toward the direction of rotation of the annular disc, including inner arcs and back arcs arranged in sequence along the direction of rotation of the annular disc; wherein, the inner arc and The back arcs have different centers and both ends intersect, or the inner arcs and back arcs have the same center and are arranged in parallel.

Optionally, the annular disc is arranged according to one or more of the following structures:

The distance between two adjacent annular disks gradually increases along the direction of air flow in the air inlet channel;

The inner diameters of the plurality of annular disks are gradually reduced along the direction of the airflow flowing in the air inlet channel;

Each annular disc is an arc-shaped disc gradually approaching the driving disc from the inner side to the outer side.

The air purifier of the present invention is provided with a laminar flow fan in the casing, and a fresh air system is also provided at the same time, the indoor air filtered through the filter element and the outdoor air introduced by the fresh air system enter the air inlet channel of the laminar flow fan, and the laminar flow fan passes through The fluid viscosity effect disturbs the air to achieve laminar air supply, with high air supply efficiency, low noise, high air volume, and high wind pressure, which effectively improves the user experience of the air purifier.

Furthermore, the air purifier of the present invention is provided with a fresh air filter element or an air duct to filter the outdoor air before being blown by a laminar flow fan, which is more user-friendly.

Further, the air purifier of the present invention arranges the laminar flow fan and the air outlet on the upper part, and arranges the annular filter element and the fresh air system under the laminar flow fan, so as to realize air supply from the upper part, avoid direct blowing of the air to the user, and improve the user's safety. Using experience, it can achieve 360° uniform air supply under optimal conditions.

Those skilled in the art will be more aware of the above and other objects, advantages and features of the present invention according to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings.

Description of drawings

Hereinafter, some specific embodiments of the present invention will be described in detail by way of illustration and not limitation with reference to the accompanying drawings. The same reference numerals in the drawings designate the same or similar parts or parts. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the attached picture:

FIG. 1 is a schematic perspective view of an air cleaner according to an embodiment of the present invention.

Fig. 2 is a schematic exploded view of the air purifier shown in Fig. 1 .

Fig. 3 is a schematic cross-sectional view of the air cleaner shown in Fig. 1 .

Fig. 4 is a schematic exploded view of an air purifier according to another embodiment of the present invention.

Fig. 5 is a schematic sectional view of the air cleaner shown in Fig. 4 .

Fig. 6 is another schematic cross-sectional view of an air cleaner according to an embodiment of the present invention.

Fig. 7 is a schematic perspective view of a filter element of an air purifier according to an embodiment of the present invention.

Fig. 8 is a schematic perspective view of a filter element of an air purifier according to an embodiment of the present invention.

Fig. 9 is a schematic perspective view of a housing of an air cleaner according to an embodiment of the present invention.

FIG. 10 is a schematic perspective view of a windshield suitable for the air cleaner shown in FIG. 9 .

Fig. 11 is a schematic perspective view of a partition of an air cleaner according to an embodiment of the present invention.

Fig. 12 is a schematic perspective view of a fixing plate of an air cleaner according to an embodiment of the present invention.

Fig. 13 is a schematic perspective view of a laminar flow fan of a laminar flow fan of an air purifier according to an embodiment of the present invention.

Fig. 14 is a schematic diagram of the air supply principle of the laminar flow fan of the air purifier shown in Fig. 1 .

Fig. 15 is a diagram showing the velocity distribution and force distribution of the laminar flow fan of the air cleaner shown in Fig. 1 .

Fig. 16 is a schematic cross-sectional view of the laminar flow fan shown in Fig. 13 .

Fig. 17 is a schematic perspective view of another viewing angle of the laminar flow fan shown in Fig. 13 .

Fig. 18 is a schematic perspective view of another viewing angle of the laminar flow fan shown in Fig. 13 .

Fig. 19 is a schematic cross-sectional view of the cooperation of the fixing mechanism, the motor and the laminar flow fan of the air cleaner according to one embodiment of the present invention.

Fig. 20 is a schematic exploded view of a motor and a fixing mechanism of an air purifier according to an embodiment of the present invention.

Fig. 21 is a schematic front view of a laminar flow fan of an air cleaner according to an embodiment of the present invention.

Fig. 22 is a schematic perspective view of another viewing angle of the laminar flow fan shown in Fig. 21 .

Fig. 23 is a schematic diagram of the air circulation of the laminar flow fan shown in Fig. 21 .

Fig. 24 is a schematic cross-sectional view of the laminar flow fan shown in Fig. 21 .

FIG. 25 is a schematic diagram showing the relationship between the chord length of the blade of the laminar flow fan shown in FIG. 21 and the air volume and wind pressure.

Fig. 26 is a schematic cross-sectional view of a laminar flow fan of an air purifier with double arc blades according to an embodiment of the present invention.

Fig. 27 is a schematic diagram of the relationship between the installation angle of the double-arc blades and the air volume and air pressure.

Fig. 28 is a schematic cross-sectional view of a laminar flow fan of an air purifier having aviation blades according to an embodiment of the present invention.

Fig. 29 is a schematic diagram of the relationship between the installation angle of the aviation blade and the air volume and wind pressure.

Fig. 30 is a schematic front view of the laminar flow fan of the laminar flow fan of the air purifier according to an embodiment of the present invention, in which the pitch of the annular disks changes gradually.

Fig. 31 is a schematic perspective view of the laminar flow fan shown in Fig. 30 .

FIG. 32 is a schematic diagram of the relationship between the gradual change of the pitch of multiple annular disks and the air volume and wind pressure of the laminar flow fan shown in FIG. 30 .

Fig. 33 is a schematic cross-sectional view of the laminar flow fan of the laminar flow fan of the air cleaner according to an embodiment of the present invention, the inner diameter of the annular disk gradually changes.

Fig. 34 is a schematic diagram of the relationship between the gradual change of inner diameters of the multiple annular disks and the air volume and air pressure of the laminar flow fan shown in Fig. 33 .

Fig. 35 is a line connecting the inner and outer diameters of multiple annular disks of the laminar flow fan of the air purifier according to an embodiment of the present invention, which is an arc-shaped laminar flow fan, on the same longitudinal section passing through the central axis A schematic diagram of the central angle of a circle.

FIG. 36 is a schematic diagram of the relationship between the central angle of the laminar flow fan shown in FIG. 35 and the air volume and wind pressure.

Detailed ways

FIG. 1 is a schematic perspective view of an air purifier 100 according to an embodiment of the present invention. FIG. 2 is a schematic exploded view of the air cleaner 100 shown in FIG. 1 . FIG. 3 is a schematic cross-sectional view of the air cleaner 100 shown in FIG. 1 . The air purifier 100 of the embodiment of the present invention may generally include a housing 200 , a filter element 120 , a fresh air system 900 , and a laminar flow fan 110 . The housing 200 is provided with an indoor air inlet 201 and an air outlet 202 . The filter element 120 is disposed in the housing 200 , and indoor air enters the housing 200 from the indoor air inlet 201 and reaches the filter element 120 for filtering. The fresh air system 900 is connected to the housing 200 and has an outdoor air inlet 203 through which outdoor air enters the housing 200 . The laminar flow fan 110 is arranged in the casing 200, and an air inlet passage 302 is formed at the center thereof, the indoor air filtered by the filter element 120 and/or the outdoor air entering the casing 200 reaches the air inlet passage 302, and the laminar flow fan 110 passes the fluid viscosity The effect disturbs the air reaching the air inlet channel 302 to form a laminar flow, and the laminar flow is discharged from the casing 200 through the air outlet 202 .

The air purifier 100 of the embodiment of the present invention is provided with the laminar flow fan 110 in the casing 200, and the fresh air system 900 is also set at the same time, the indoor air filtered by the filter element 120 and the outdoor air introduced by the fresh air system 900 can enter the laminar flow In the air inlet channel 302 of the fan 110, the laminar flow fan 110 disturbs the air through the fluid viscosity effect to achieve laminar air supply, with high air supply efficiency, low noise, high air volume, and high wind pressure, which effectively improves the use of the air purifier 110 users. Experience, and the appearance is novel, the function is good, and the quality is excellent.

The fresh air system 900 of the air purifier 100 of the embodiment of the present invention is a system that can be closed, that is, when the outdoor air is good, the fresh air system 900 is turned on, and after the outdoor air enters the housing 200, the laminar flow fan 110 acts to form a laminar flow. When the outdoor air is polluted or other situations that do not require fresh air, the fresh air system 900 is turned off.

In some embodiments, the fresh air system 900 of the air purifier 100 of the embodiment of the present invention includes: a fresh air duct 901 and a centrifugal fan 902 . The first end of the fresh air duct 901 is located outdoors and is provided with an outdoor air inlet 203 , and the second end extends into the casing 200 . Outdoor air enters the fresh air duct 901 through the outdoor air inlet 203 and is driven by the centrifugal fan 902 to move into the casing 200 . The centrifugal fan 902 includes a centrifugal fan and a motor, which can be assembled from existing centrifugal fans and motors, and its structure will not be described in detail here.

In some embodiments, the fresh air system 900 of the air cleaner 100 of the embodiment of the present invention further includes: a volute 903 having an inlet and an outlet. The centrifugal fan 902 is arranged in the volute 903 , and it drives the outdoor air to enter the volute 903 from the inlet, turn around in the volute 903 and then enter the housing 200 from the outlet. In one embodiment, the inlet and outlet of the volute 903 are configured such that the air entering from the inlet is turned 90° and then discharged from the outlet.

In order to prevent the outdoor air from polluting the indoor air, the outdoor air reaches the air inlet channel 302 after being filtered.

In some embodiments, the fresh air system 900 further includes: a fresh air filter element 905 disposed in the fresh air duct 901 , and the centrifugal fan 902 drives outdoor air filtered by the fresh air filter element 905 into the volute 903 from the inlet of the volute 903 . The fresh air filter element 905 may have a shape matching the inner shape of the fresh air duct 901 . For example, the fresh air duct 901 is a hollow cylinder, and the fresh air filter element 905 is a solid cylinder with an outer diameter slightly smaller than an inner diameter of the fresh air duct 901 . For another example, the fresh air duct 901 is a hollow cuboid with a rectangular longitudinal section, and the fresh air filter element 905 is a solid cuboid whose length and width are slightly smaller than the length and width of the rectangle in the longitudinal section of the fresh air duct 901 . The specific structural components of the fresh air filter element 905 such as materials and manufacturing processes can be selected from the materials and processes disclosed in the prior art, and will not be described in detail here.

In some other embodiments, an air channel plate 904 is disposed inside the casing 200, and the air channel plate 904 is configured to form an air channel 941 with at least a part of the filter element 120; the outlet of the volute 903 communicates with the air channel 941, so that The outdoor air is discharged from the outlet of the volute 903 and then enters the air channel 941 and is filtered by the filter element 120 before reaching the air inlet channel 302 .

In some embodiments, the laminar flow fan 110 includes a laminar flow fan 300 and a motor 400 . FIG. 13 is a schematic perspective view of the laminar flow fan 300 . The laminar flow fan 300 includes a plurality of annular disks 301, which are arranged in parallel at intervals from each other, have the same central axis and form an air inlet channel 302 in the center, and enter the air inlet channel 302 to reach the plurality of annular disks 301 gap between. The motor 400 is connected to the laminar flow fan 300 and is configured to drive a plurality of annular disks 301 to rotate, so that the air boundary layer 304 close to the surface of the plurality of annular disks 301 is driven by the rotating plurality of annular disks 301 to rotate from inside to outside. Laminar winds are formed. The air boundary layer 304 is a very thin air layer close to the surface of each disc.

FIG. 14 is a schematic diagram of the air supply principle of the laminar flow fan 110 . The motor 400 drives a plurality of annular disks 301 to rotate at high speed, and the air in the intervals of each annular disk 301 contacts and moves with each other, and the air boundary layer 304 close to the surface of each annular disk 301 is affected by the viscous shear force τ. The rotating annular disc 301 is driven to rotate from inside to outside to form laminar wind. Fig. 15 is the speed distribution and the force distribution diagram of the laminar flow fan 110 of the air purifier 100 of the embodiment of the present invention, it is the viscous shear force distribution τ (y) and the speed distribution u (y) that the air boundary layer 304 is subjected to schematic diagram. The viscous shearing force experienced by the air boundary layer 304 is actually the resistance produced by each disc to the air boundary layer 304 . The axis of abscissa in FIG. 15 refers to the distance in the moving direction of the air boundary layer 304 , and the axis of ordinate refers to the height of the air boundary layer 304 in the direction perpendicular to the moving direction. v _e is the air velocity at each point in the air boundary layer 304 , δ is the thickness of the air boundary layer 304 , and τ _w is the viscous shear force at the surface of the annular disc 301 . The variable y in τ(y) and u(y) refers to the height of the cross-section of the air boundary layer 304 in the direction perpendicular to the moving direction, and L is a certain point on the inner circumference of the annular disc 301 and a certain point on the surface of the annular disc 301. the distance between points. Then τ(y) is at the distance L, the viscous shear force distribution received when the height of the air boundary layer 304 section is y; u(y) is at the distance L, the height of the air boundary layer 304 section is y speed distribution at time.

The overall shape of the housing 200 of the air purifier 100 in the embodiment of the present invention can be designed according to actual needs, such as a cylinder, a cuboid, a cube, and other irregular shapes. In some embodiments, the housing 200 is a cuboid structure with four sides and upper and lower bottom surfaces. One or more of the four sides can be selected to set the indoor air inlet 201 to form the air inlet side. The filter element 120 may be a ring filter element 600, a flat filter element 700, and the like. Fig. 7 is a schematic perspective view of the annular filter element 600 of the air cleaner 100 according to an embodiment of the present invention. The cross section of the annular filter element 600 is annular, with a hollow channel in the center. Fig. 8 is a schematic perspective view of the flat filter element 700 of the air purifier 100 according to an embodiment of the present invention. The flat filter element 700 is a rectangular parallelepiped filter element as a whole. The number of air intake sides of the air cleaner 100 using different types of filter elements on the housing 200, the location of the fresh air system 900, the way the outdoor air is filtered, the location of the air duct plate 904, etc. should be properly arranged. Adjustment.

In some embodiments, a laminar flow fan 300 and a motor 400 are arranged in the upper part of the casing 200; an air outlet 202 is arranged in the upper part of the casing 200 corresponding to the position of the laminar flow fan 300; the filter element 120 is vertically arranged in the laminar flow Below the fan 300 ; the casing 200 forms an accommodation chamber below the filter element 120 , the centrifugal fan 902 and the volute 903 are arranged in the accommodation chamber, and the opening of the outlet of the volute 903 is upward. In order to make the indoor air and/or outdoor air filtered by the filter element 120 or the outdoor air filtered by the fresh air filter element 905 move into the air inlet channel 302 as much as possible, in some embodiments, the air purifier of the embodiment of the present invention 100 also includes: two partitions 101, one is arranged between the laminar flow fan 300 and the filter element 120, and the other is arranged between the volute 903 and the casing 200 or between the volute 903 and the air channel plate 904 and the filter element 120 . FIG. 11 is a schematic perspective view of a partition 101 of an air cleaner 100 according to an embodiment of the present invention. The shapes of the two partitions 101 can be the same or different, and their specific shapes can be designed according to the structures of the laminar flow fan 300 , the filter element 120 , the air duct plate 904 , the volute 903 and the housing 200 . For example, in one embodiment, the housing 200 is in the shape of a cuboid, and the cross-section of the partition 101 is also a square, with a hollow structure in its central part; One side of the hollow structure of the lower partition 101 is docked with the hollow channel of the annular filter element 600, and the other side is docked with the outlet of the volute 903.

In one embodiment, an air outlet 202 is arranged around the upper part of the housing 200 at a position corresponding to the laminar flow fan 300 , so as to realize 360° air supply.

As shown in Figures 2 and 3, in one embodiment, a laminar flow fan 300 and a motor 400 are arranged in the upper part of the casing 200, and a plurality of indoor air inlets 201 are arranged in the middle of the casing 200 to form two opposite air inlet sides, The filter element 120 is an annular filter element 600, and the casing 200 also forms an accommodation cavity below the annular filter element 600. The centrifugal fan 902 and the volute 903 are both arranged in the accommodation cavity, and the opening of the outlet of the volute 903 is upward, and the fresh air duct 901 A fresh air filter element 905 is arranged inside. FIG. 6 is another schematic cross-sectional view of the air cleaner 100 according to one embodiment of the present invention. Referring to FIG. 3 and FIG. 6 , the flow directions of outdoor air and indoor air are shown, respectively. Outdoor air enters the fresh air duct 901 through the outdoor air inlet 203 , reaches the fresh air filter element 905 after being filtered, and then reaches the hollow channel of the annular filter element 600 through the inlet and outlet of the volute 903 . The indoor air reaches the annular filter element 600 from two opposite air intake sides of the housing 200 and then reaches the hollow channel of the annular filter element 600 after being filtered.

FIG. 4 is a schematic exploded view of an air purifier 100 according to another embodiment of the present invention. FIG. 5 is a schematic cross-sectional view of the air cleaner 100 shown in FIG. 4 . In one embodiment, a laminar fan 300 and a motor 400 are arranged in the upper part of the casing 200, and a plurality of indoor air inlets 201 are arranged in the middle of the casing 200 to form two opposite air inlet sides, and the filter element 120 is an annular filter element 600. The body 200 is also formed with an accommodation chamber below the annular filter element 600, and the centrifugal fan 902 and the volute 903 are both arranged in the accommodation chamber, and the opening of the outlet of the volute 903 is upward, and at the same time, the non-inlet side inside the housing 200 and the An air channel plate 904 is also arranged between the annular filter elements 600 , and an air channel 941 is formed between the air channel plate 904 and the annular filter element 600 at the non-inlet side part. FIG. 6 is another schematic cross-sectional view of the air cleaner 100 according to one embodiment of the present invention. Referring to FIG. 5 and FIG. 6 , flow directions of outdoor air and indoor air are shown, respectively. Outdoor air enters the fresh air duct 901 through the outdoor air inlet 203 , passes through the inlet and outlet of the volute 903 to the air duct 941 , and is filtered by the part of the annular filter element 600 forming the air duct 941 to reach the hollow passage of the annular filter element 600 . The indoor air is filtered from the two air intake sides of the casing 200 to the annular filter element 600 and then reaches the hollow channel of the annular filter element 600 .

FIG. 9 is a schematic perspective view of the housing 200 of the air cleaner 100 according to one embodiment of the present invention. FIG. 10 is a schematic perspective view of a windshield 500 suitable for the air cleaner 100 shown in FIG. 9 . The air purifier 100 of the embodiment of the present invention also includes: a windshield 500, which is arranged outside the laminar flow fan 300, between the casing 200 and the laminar flow fan 300, and has a gap 501 on it; An air outlet 202 is provided at the position of the notch 501 , and laminar air flows out of the casing 200 through the notch 501 and the air outlet 202 in sequence. For example, when the installation position of the air cleaner 100 is at the corner where two walls are perpendicular, the windshield 500 is set to have a notch 501 on its side facing away from the wall, and the air outlet 202 is set at the corresponding side of the housing 200 At the same time, the height of the gap 501 is slightly higher than the height of the air outlet 202, and the width is slightly larger than the width of the air outlet 202, so that the laminar flow wind generated by the laminar flow fan 300 is affected by the windshield 500, only from the gap 501 through the position The air outlet 202 at the front end blows out the air purifier 100, without wasting laminar air. In one embodiment, the windshield 500 has a roughly square cross-section and a cavity in the center that can accommodate the laminar flow fan 300, and a gap 501 is provided on one or more sides of the structure to meet the needs of users for shells of different shapes. Body 200, different installation locations, and air purifiers 100 with different air supply requirements.

In some embodiments, the laminar flow fan 300 further includes: a driving disk 305 and a connecting piece 306 . The driving disc 305 is arranged in parallel with the plurality of annular discs 301 at intervals. The connecting piece 306 runs through the driving disc 305 and the plurality of annular discs 301 to connect the plurality of annular discs 301 to the driving disc 305 . The motor 400 is configured to directly drive the driving disc 305 to rotate, and then the driving disc 305 drives the plurality of annular discs 301 to rotate.

In some embodiments, the driving disk 305 of the laminar flow fan 300 has a recessed portion 351 formed at its center facing the plurality of annular disks 301 , and the motor 400 is fixedly disposed in the recessed portion 351 . FIG. 13 is a schematic perspective view of the laminar flow fan 300 . FIG. 16 is a schematic cross-sectional view of the laminar flow fan 300 shown in FIG. 13 . FIG. 17 is a schematic perspective view of another viewing angle of the laminar flow fan 300 shown in FIG. 13 . FIG. 18 is a schematic perspective view of another viewing angle of the laminar flow fan 300 shown in FIG. 13 . The air cleaner 100 of the embodiment of the present invention may further include: a fixing mechanism 401 disposed in the housing 200 for fixing the motor 400 . FIG. 19 is a schematic cross-sectional view of the cooperation of the fixing mechanism 401 , the motor 400 and the laminar flow fan 300 . FIG. 20 is a schematic exploded view of the motor 400 and the fixing mechanism 401 . The fixing mechanism 401 includes a fixing plate 411 and a fixing frame 412 , and the motor 400 is arranged between the fixing plate 411 and the fixing frame 412 . The fixing frame 412 has a body portion 421 and a claw portion 422 extending from the body portion 421 toward the fixing plate 411 . The main body 421 is provided with a through hole 423 , and the output shaft of the motor 400 protrudes from the fixing frame 412 through the through hole 423 and is connected with the laminar flow fan 300 . The claw portion 422 is used for fixing with the fixing plate 411 and matched with the recessed portion 351 . A connecting hole 352 is provided at the center of the recessed portion 351 , and the output shaft of the motor 400 is inserted into the connecting hole 352 and fixed with the driving disc 305 . The fixing plate 411 is provided with a plate connecting hole 414 , and the claw portion 422 is provided with a claw connecting hole 424 , and the claw portion 422 is fixed to the fixing plate 411 by using a bolt or the like. Fig. 12 is a schematic perspective view of the fixing plate 411 of the air cleaner 100 according to an embodiment of the present invention, and the fixing plate 411 is also provided with reinforcing ribs 415.

In some other embodiments, the driving disc 305 of the laminar flow fan 300 has a plane, and the motor 400 is fixedly arranged on the plane of the driving disc 305 . FIG. 21 is a schematic front view of a laminar flow fan 110 with a drive disc 305 having a flat surface. FIG. 22 is a schematic perspective view of another viewing angle of the laminar flow fan 110 shown in FIG. 21 . In a preferred embodiment, the lower surface of the driving disk 305 also has an inverted conical protrusion 353, the inverted conical protrusion 353 can effectively guide the air entering the laminar flow fan 300 through the air inlet channel 302 into between the discs The gap between them improves the efficiency of forming laminar wind.

FIG. 23 is a schematic diagram of the air circulation of the laminar flow fan 110 shown in FIG. 21. The centers of multiple annular disks 301 are jointly formed with an air inlet channel 302, so that the air outside the laminar flow fan 300 enters; multiple annular disks 301 A plurality of outlets 303 are formed in the gaps between them for blowing out the laminar wind.

The connecting part 306 of the laminar flow fan 300 may be a blade 361, a connecting rod 362 and the like.

FIG. 24 is a schematic cross-sectional view of the laminar flow fan 110 shown in FIG. 21 . In this embodiment, the connecting piece 306 is a blade 361, the cross section of which has two sections of curves arranged sequentially along the direction of rotation of the annular disk 301, the length of the chord line 373 of the two sections of curves is linear to the air volume of the laminar flow fan 110 In this way, the air volume of the laminar flow fan 110 can be greatly improved by increasing the length of the string 373, thereby promoting laminar air circulation. It should be noted that the two curves can be circular arcs, non-circular arcs, straight lines, etc., and the straight line can be regarded as a special curve. When the distances between the two end points of the two curves are the same, the length of the chord line 373 may be the distance between the two end points of the two curves. When the distance between the two ends of the two curves is different, if the two ends of the two curves do not intersect, the length of the chord line 373 can be the midpoint of the cross section of the blade 361 except the two curves. Line length; if two sections of curves only intersect at one end, then the length of chord line 373 can be the line length of the cross section of blade 361 except the curve midpoint of these two sections of curves and the intersecting endpoint of these two sections of curves.

In a preferred embodiment, there are a plurality of blades 361 , and evenly spaced through the driving disc 305 and the plurality of annular discs 301 . A plurality of vanes 361 evenly spaced through the drive disc 305 and the plurality of annular discs 301 can ensure that the connection relationship between the drive disc 305 and the plurality of annular discs 301 is stable, thereby ensuring that when the motor 400 drives the drive disc 305 to rotate , the driving disk 305 can stably drive a plurality of annular disks 301 to rotate, improving the working reliability of the laminar flow fan 110 .

What Fig. 25 shows is that the laminar fan 110 shown in Fig. 21 is when the outer diameter, inner diameter, number of layers, pitch, thickness, blade 361 installation angle, and the rotating speed of the motor 400 of the annular disc 301 are all kept constant, the chord The schematic diagram of the relationship between the length of the line 373 and the air volume and wind pressure, the axis of abscissa in the figure refers to the length of the chord line 373 of the blade 361, and the wind pressure refers to the pressure difference between the outlet 303 and the inlet of the air inlet channel 302. It should be noted that the outer diameter of the annular disk 301 is the radius of its outer circumference, and the inner diameter is the radius of its inner circumference. The process in which the air boundary layer 304 rotates and moves from inside to outside to form laminar wind is a centrifugal motion, so the speed when it leaves the outlet 303 is greater than the speed when it enters the air inlet channel 302 . The pressure difference between the outlet 303 and the inlet of the air inlet channel 302 is the wind pressure, and the length of the string 373 is also linearly related to the wind pressure. The wind pressure of the laminar flow fan 110 can also be greatly increased by increasing the length of the string 373 , effectively ensuring the comprehensive performance of the laminar flow fan 110 .

Considering the limited internal space of the air purifier 100 , the overall occupied volume of the laminar flow fan 110 needs to be restricted to a certain extent. Specifically, considering that the thickness of the laminar flow fan 110 should not be too large, the number of annular disks 301, the distance between two adjacent annular disks 301, and the thickness of the annular disks 301 can be restricted accordingly; considering The lateral occupied volume of the laminar flow fan 110 should not be too large, and the outer diameter of the annular disc 301 can be restricted accordingly. For example, the outer diameter of each annular disk 301 can be set to 170mm to 180mm, and the inner diameter of each annular disk 301 can be set to 110mm to 120mm, which can effectively increase the air volume and ensure that the air output of the laminar flow fan 110 meets the needs of users need. When the outer diameter and inner diameter of the annular disk 301 are constant, although the longer the chord 373 is, the greater the air volume and wind pressure of the laminar flow fan 110 will be, but the length of the chord 373 must be restricted to avoid blades 361 Excessive penetration of the annular disk 301 will result in a decrease in the stability of the laminar flow fan 110 . All in all, the length of the string 373 can be set to the maximum reachable range, so that the air volume and air pressure of the laminar flow fan 110 can meet the needs of users. In a preferred embodiment, the outer diameter of the annular disc 301 is 175mm, the inner diameter is 115mm, the number of layers is 8, the spacing is 13.75mm, the thickness is 2mm, the installation angle of the blades 361 is 25.5°, and the rotating speed of the motor 400 is 1000rpm, it can be found that after increasing the length of the string 373, both the air volume and the air pressure are greatly improved, and they are basically linear. On the premise of ensuring the stability of the laminar flow fan 110 , the length of the string 373 is set to a maximum reachable range of 40 mm to 42 mm. Moreover, when the length of the string 373 is set to 42mm, the air volume of the laminar flow fan 110 can reach 1741m ³ /h, and the wind pressure can reach 118.9Pa, which can fully meet the needs of users.

In some embodiments, the blade 361 can be a double-arc blade 310, the cross section of which has a double-arc protruding toward the direction of rotation of the annular disk 301, including inner arcs 371 sequentially arranged along the direction of rotation of the annular disk 301 and the back arc 372, and the inner arc 371 and the back arc 372 have the same center of circle and are arranged in parallel.

FIG. 26 is a schematic cross-sectional view of a laminar flow fan 110 with double arc blades 310 . In a preferred embodiment, the outer diameter of each annular disc 301 is 170 mm to 180 mm, the inner diameter of each annular disc 301 is 110 mm to 120 mm, and the difference between the outer diameter and inner diameter of the annular disc 301 is about 60 mm. The distance between the two ends of the arc 371 is the same as the distance between the two ends of the back arc 372, the length of the string 373 is the distance between the two ends of the inner arc 371 or the back arc 372, and is set to 40mm to 42mm, Make the two ends of the inner arc 371 and the back arc 372 have a distance of about 10mm from the inner circumference and the outer circumference of the annular disk 301, and under the premise of ensuring the stability of the laminar flow fan 110, the length of the string 373 is set as The maximum reachable range enables the air volume and air pressure of the laminar flow fan 110 to meet the needs of users.

Fig. 27 shows the installation angle α and Schematic diagram of the relationship between air volume and wind pressure. The axis of abscissa refers to the installation angle of the double-arc blade 310, that is, the chord between the two ends of the inner arc 371 on the same cross section of the double-arc blade 310 and the annular disc 301 The angle formed by the line 373 and the connecting line 374 passing through the midpoint of the chord line 373 and the central axis of the annular disc 301 . In a preferred embodiment, the outer diameter of the annular disc 301 is 175 mm, the inner diameter is 115 mm, the number of layers is 8 layers, the pitch is 13.75 mm, the thickness is 2 mm, the chord length of the double arc blades 310 is 35 mm, and the motor 400 The rotating speed is 1000rpm, considering the air volume and air pressure, the installation angle α of the double-arc blades 310 can be set from -5° to 55°. It should be noted that when the rotation direction of the annular disc 301 is followed by the chord line 373 and the connecting line 374, the installation angle α is a positive number; When the line 373, the installation angle α is a negative number. This installation angle takes both the air volume and wind pressure of the laminar flow fan 110 into consideration, effectively guaranteeing the comprehensive performance of the laminar flow fan 110, making the air output of the laminar flow fan 110 meet the needs of users while the wind pressure is high, and further improving the use of users experience.

In some other embodiments, the blade 361 can be an aviation blade 320, and its cross section has a double circular arc protruding toward the direction of rotation of the annular disk 301, including inner arcs 371 and The back arc 372, and the inner arc 371 and the back arc 372 have different centers and both ends intersect. FIG. 28 is a schematic cross-sectional view of a laminar flow fan 110 with aeronautical blades 320 .

Fig. 29 is the laminar fan 110 shown in Fig. 28 when the outer diameter, inner diameter, number of layers, pitch, thickness, chord length of the aviation blade 320, and the rotating speed of the motor 400 of the annular disk 301 are all kept constant. The schematic diagram of the relationship between the installation angle α and the air volume and wind pressure, the axis of abscissa refers to the installation angle of the aviation blade 320, that is, on the same cross section of the aviation blade 320 and the annular disk 301, the two sides of the inner arc 371 or the back arc 372 The included angle formed by the chord line 373 between the end points and the connecting line 374 passing through the middle point of the chord line 373 and the central axis of the annular disc 301 . In a preferred embodiment, the outer diameter of the annular disc 301 is 175 mm, the inner diameter is 115 mm, the number of layers is 8 layers, the pitch is 13.75 mm, the thickness is 2 mm, the chord length of the aviation blade 320 is 35 mm, and the rotating speed of the motor 400 is 1000rpm, considering the wind volume and wind pressure, the installation angle α of the aviation blade 320 can be set to -50° to 15°. This installation angle takes both the air volume and wind pressure of the laminar flow fan 110 into consideration, effectively guaranteeing the comprehensive performance of the laminar flow fan 110, making the air output of the laminar flow fan 110 meet the needs of users while the wind pressure is high, and further improving the use of users experience.

The annular disc 301 of the laminar flow fan 300 can also be arranged according to one or more of the following structures: the distance between two adjacent annular discs 301 gradually increases along the direction of air flow in the air inlet channel 302 The inner diameters of the plurality of annular disks 301 are gradually reduced along the direction of air flow in the air inlet channel 302; each annular disk 301 is an arc-shaped disk that gradually approaches the driving disk 305 from the inside to the outside.

In some embodiments, the plurality of annular disks 301 of the laminar flow fan 300 are arranged parallel to each other at intervals and have the same central axis, and the distance between two adjacent annular disks 301 is along the air inlet channel 302 The direction of flow gradually increases. FIG. 30 is a schematic front view of the laminar flow fan 110 in which the pitch of the annular discs 301 changes gradually. The inventor found through many experiments that as the distance between two adjacent annular disks 301 gradually increases along the direction of air flow in the air inlet passage 302, the air volume of the laminar flow fan 110 will be effectively increased, so that the laminar flow The air output from the flow fan 110 meets the user's requirements.

Taking the laminar flow fan 110 arranged in the upper part of the housing 200 as an example, Fig. 32 shows that the outer diameter, inner diameter, quantity, thickness, and rotational speed of the motor 400 of the annular disk 301 of the laminar flow fan 110 shown in Fig. 30 remain unchanged. , a schematic diagram of the relationship between the gradual change of the pitch of multiple annular discs 301 and the air volume and wind pressure, where the axis of abscissa refers to the variation of the pitch between two adjacent annular discs 301 along the direction from bottom to top. As shown in Figure 32, when the above-mentioned parameters are kept constant, the distance between every two adjacent annular disks 301 in the plurality of annular disks 301 gradually changes from bottom to top, which has a great influence on the air volume , has little effect on the wind pressure; when the amount of change in the distance between two adjacent annular disks 301 along the direction from bottom to top represented by the axis of abscissa is a positive number, it means that each of the plurality of annular disks 301 The distance between two adjacent annular discs 301 gradually increases from bottom to top; when the variation of the distance between two adjacent annular discs 301 along the direction from bottom to top indicated by the axis of abscissa is a negative number , it shows that the distance between every two adjacent annular disks 301 among the plurality of annular disks 301 gradually decreases from bottom to top. Therefore, as can be seen from FIG. 32, when the variation of the spacing between every two adjacent annular disks 301 among the plurality of annular disks 301 is -1mm, 1mm and 2mm, the air volume and wind pressure of the laminar flow fan 110 are very different. Big improvement.

As mentioned above, the connecting piece 306 of the laminar flow fan 300 in the embodiment of the present invention may be the connecting rod 362 . FIG. 31 is a schematic perspective view of the laminar flow fan 110 shown in FIG. 30 . There may be a plurality of connecting rods 362 , and evenly spaced through the driving disk 305 and edge portions of the plurality of annular disks 301 . A plurality of connecting rods 362 run through the edge portions of the drive disc 305 and the plurality of annular discs 301 at even intervals, which can ensure that the connection relationship between the drive disc 305 and the plurality of annular discs 301 is stable, thereby ensuring that the motor 400 drives When the disk 305 rotates, the driving disk 305 can stably drive the rotation of multiple annular disks 301 , improving the working reliability of the laminar flow fan 110 . At the same time, when the connecting piece 306 is the connecting rod 362, the rotational speed of the motor 400 is approximately linearly related to the air volume of the laminar flow fan 110, so in a preferred embodiment, the motor 400 can also be configured as follows: the rotational speed of the motor 400 is obtained according to The target air volume of the laminar flow fan 110 is determined. That is to say, the target air volume of the laminar flow fan 110 can be obtained first, and then the rotational speed of the motor 400 can be determined according to the linear relationship between it and the rotational speed of the motor 400 . It should be noted that the target air volume can be obtained through user input operations. In a preferred embodiment, the outer diameter of the annular disk 301 is 175 mm, the inner diameter is 115 mm, and the number of layers is 8 layers. The distance between two adjacent annular disks 301 is set as follows from bottom to top: 13.75 mm .

In some embodiments, the inner diameters of the plurality of annular disks 301 of the laminar flow fan 300 of the embodiment of the present invention are gradually reduced along the direction of air flow in the air inlet channel 302 . Taking the laminar flow fan 300 disposed in the upper part of the casing 200 as an example, FIG. 33 is a schematic cross-sectional view of the laminar flow fan 300 with a gradually changing inner diameter of the annular disc 301 . Fig. 34 is a laminar flow fan 110 having a laminar flow fan 300 as shown in Fig. 33 when the outer diameter, spacing, quantity, thickness, and the rotating speed of the motor 400 of the annular disk 301 are kept constant, a plurality of annular disks 301 A schematic diagram of the relationship between the inner diameter gradient and the air volume and wind pressure, wherein the axis of abscissa refers to the amount of change between the inner diameter of each annular disk 301 and the inner diameter of the adjacent annular disk 301 below. As shown in FIG. 34 , when the above-mentioned parameters are kept constant, the gradual change of the inner diameters of the plurality of annular disks 301 from bottom to top has a greater impact on the air volume, but little impact on the air pressure. When the amount of change between the inner diameter of each annular disc 301 represented by the abscissa axis and the inner diameter of the adjacent annular disc 301 below is a positive number, it means that the inner diameters of a plurality of annular discs 301 gradually increase from bottom to top; When the change amount of the inner diameter of each annular disc 301 represented by the coordinate axis and the inner diameter of the adjacent annular disc 301 below is a negative number, it means that the inner diameters of the plurality of annular discs 301 gradually decrease from bottom to top. It can be seen from Fig. 34 that when the inner diameters of multiple annular discs 301 gradually decrease from bottom to top, the air volume increases and the wind pressure decreases slightly; when the inner diameters of multiple annular discs 301 gradually increase from bottom to top, the wind pressure decreases slightly. There is an increase, and the air volume decreases a lot. In a preferred embodiment, the outer diameter of the annular disc 301 is 175 mm, the maximum inner diameter of the annular disc 301 is 115 mm, the pitch is 13.75 mm, the number is 8, the thickness is 2 mm, and the rotating speed of the motor 400 is 1000 rpm. In consideration of comprehensive air volume and wind pressure, the variation between the inner diameter of each annular disc 301 and the inner diameter of the adjacent annular disc 301 below can be set to -5mm, that is to say, the inner diameters of the eight annular discs 301 are respectively For: 115mm, 110mm, 105mm, 100mm, 95mm, 90mm, 85mm, 80mm.

In some embodiments, the annular disk 301 of the laminar flow fan 300 is an arc-shaped disk gradually approaching the driving disk 305 from the inner side to the outer side. Taking the laminar flow fan 300 installed in the upper part of the housing 200 as an example, each annular disc 301 is set as an arc-shaped disc that gradually rises from the inside to the outside and protrudes upwards, so that external air enters the laminar flow fan 300 The angle is more in line with fluid flow, so that it is more conducive for external air to enter the laminar flow fan 300, effectively reducing the loss of air volume, and ensuring that the air output of the laminar flow fan 110 meets the needs of users. FIG. 35 is a schematic diagram of the central angle θ of the line connecting the inner and outer diameters of a plurality of annular discs 301 on the same longitudinal section passing through the central axis. FIG. 36 is a schematic diagram of the relationship between the central angle θ and the air volume and air pressure when the outer diameter, number of layers, pitch, thickness, and rotational speed of the motor 400 of the annular disk 301 are kept constant. As shown in Figure 36, when the above-mentioned parameters are kept constant, as the central angle θ gradually increases, the air volume first increases and then decreases, while the air pressure increases slightly. In a preferred embodiment, the outer diameter of the annular disk 301 is 175mm, the number of layers is 10, the pitch is 13.75mm, the thickness is 2mm, and the rotating speed of the motor 400 is 1000rpm. Considering the comprehensive air volume and air pressure, the central angle θ Can be set from 9° to 30°. And as shown in FIG. 36 , when the central angle θ is set to 15°, the air volume of the laminar flow fan 110 reaches the maximum value.

So far, those skilled in the art should appreciate that, although a number of exemplary embodiments of the present invention have been shown and described in detail herein, without departing from the spirit and scope of the present invention, the disclosed embodiments of the present invention can still be used. Many other variations or modifications consistent with the principles of the invention are directly identified or derived from the content. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (12)

1. An air purifier, comprising:

the shell is provided with an indoor air inlet and an indoor air outlet;

the filter element is arranged in the shell, and indoor air enters the shell from the indoor air inlet and then reaches the filter element for filtering;

the fresh air system is connected with the shell and provided with an outdoor air inlet, and outdoor air enters the shell through the outdoor air inlet; and

the laminar flow fan is arranged in the shell and is provided with an air inlet channel, the indoor air filtered by the filter element and/or the outdoor air entering the shell reach the air inlet channel, the laminar flow fan disturbs the air reaching the air inlet channel through a fluid viscosity effect to form laminar flow air, and the laminar flow air is discharged out of the shell from the air outlet;

The laminar flow fan comprises a laminar flow fan, the laminar flow fan comprises a plurality of annular disks, the annular disks are arranged in parallel at intervals, the annular disks have the same central axis, the centers of the annular disks jointly form the air inlet channel, and air entering the air inlet channel reaches gaps among the annular disks;

the laminar flow fan comprises a driving disc and a connecting piece, wherein the driving disc and the plurality of annular discs are arranged in parallel at intervals; the connecting member penetrates the driving disk and the plurality of annular disks to connect the plurality of annular disks to the driving disk;

the connecting piece is a blade, the cross section of the blade is provided with a double arc protruding towards the rotating direction of the annular disc, and the double arc comprises an inner arc and a back arc which are sequentially arranged along the rotating direction of the annular disc.

2. An air purifier as recited in claim 1, wherein,

the fresh air system comprises:

the first end of the fresh air pipeline is positioned outdoors, the outdoor air inlet is arranged, and the second end of the fresh air pipeline extends into the shell; and

and the outdoor air enters the fresh air pipeline through the outdoor air inlet and is driven by the centrifugal fan to move into the shell.

3. An air purifier as recited in claim 2, wherein,

the fresh air system further comprises:

a volute having an inlet and an outlet;

the centrifugal fan is arranged in the volute, and drives the outdoor air to enter the volute from the inlet and enter the housing from the outlet after rotating in the volute.

4. An air purifier as recited in claim 3, wherein,

the fresh air system further comprises:

the fresh air filter element is arranged in the fresh air pipeline, and the centrifugal fan drives the outdoor air filtered by the fresh air filter element to enter the volute from the inlet.

5. An air purifier as recited in claim 3, wherein,

an air duct plate is arranged in the shell and is configured to form an air duct with at least one part of the filter element;

the outlet of the volute is communicated with the air channel, so that the outdoor air enters the air channel after being discharged from the outlet and reaches the air inlet channel after being filtered by the filter element.

6. An air purifier as recited in claim 3, wherein,

the laminar flow fan comprises:

and the motor is connected with the laminar flow fan and is configured to drive the plurality of annular discs to rotate, so that the air boundary layers close to the surfaces of the plurality of annular discs are driven by the plurality of annular discs to rotate from inside to outside to form the laminar flow wind.

7. The air purifier as recited in claim 6, wherein,

the laminar flow fan and the motor are arranged at the upper part in the shell;

the upper part of the shell is provided with the air outlet at a position corresponding to the laminar flow fan;

the filter element is an annular filter element and is vertically arranged below the laminar flow fan;

the housing is formed with a receiving cavity below the filter element, the centrifugal fan and the volute are arranged in the receiving cavity, and an opening of an outlet of the volute is upward.

8. The air purifier of claim 6, further comprising:

the wind shielding piece is arranged outside the laminar flow fan, is positioned between the shell and the laminar flow fan and is provided with a notch;

the shell is provided with the air outlet at the position corresponding to the notch, and the laminar air flows out of the shell through the notch and the air outlet in sequence.

9. The air purifier as recited in claim 6, wherein,

the motor is configured to directly drive the driving disc to rotate, and the driving disc drives the plurality of annular discs to rotate.

10. The air purifier of claim 9, wherein the air purifier comprises a housing,

The driving disk is formed with a recess at its center toward the plurality of annular disks;

the air purifier further includes:

the fixing mechanism is arranged in the shell and comprises a fixing plate and a fixing frame, and the motor is arranged between the fixing plate and the fixing frame; wherein the method comprises the steps of

The fixing frame is provided with a body part and a claw part extending from the body part towards the fixing plate;

the body part is provided with a through hole, and an output shaft of the motor extends out of the fixing frame from the through hole and is connected with the laminar flow fan;

the claw portion is used for being fixed with the fixed plate and is matched with the concave portion.

11. The air purifier of claim 9, wherein the air purifier comprises a housing,

the inner arc and the back arc have different circle centers and both ends intersect, or

The inner arc and the back arc have the same circle center and are arranged in parallel.

12. The air purifier of claim 9, wherein the air purifier comprises a housing,

the annular disc is arranged according to one or more of the following structures:

the distance between two adjacent annular disks is gradually increased along the flowing direction of the air flow in the air inlet channel;

The inner diameters of the plurality of annular disks are gradually reduced along the flowing direction of the air flow in the air inlet channel;

each annular disc is an arc disc which gradually approaches the driving disc from the inner side to the outer side.

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