Air Purifier

Abstract

The present application discloses an air purifier, comprising a housing (10), wherein the housing (10) has a filter chamber (15) and a drive chamber (16), wherein a filter screen (20) is arranged in the filter chamber (15), and a wind wheel (30) is arranged in the drive chamber (16); an air inlet hole (17) and an air outlet structure (11) are arranged on the housing (10), and an air inlet structure (40) is arranged between the filter chamber (15) and the drive chamber (16); the air inlet structure (40) comprises a first air inlet surface (41) and a second air inlet surface (42), wherein the first air inlet surface (41) axially extends into a hollow area (21) of the filter screen (20) and is coaxially arranged with the wind wheel (30), and the second air inlet surface (42) extends from the periphery of the first air inlet surface (41) to a port of the filter screen (20) facing the wind wheel (30). The total air intake area of ​​the first air intake surface (41) and the second air intake surface (42) is increased, thereby reducing air intake resistance and noise.

Description

Technical Field

[0001] The present application belongs to the technical field of air purification equipment, and more specifically, to an air purifier. Background Art

[0002] An air purifier refers to a household appliance that can absorb, decompose or transform various air pollutants (generally including PM2.5, dust, pollen, odor, decoration pollution such as formaldehyde, bacteria, allergens, etc.), effectively improving the cleanliness of the air. It is mainly divided into household, commercial, industrial and building applications.

[0003] The air purifier is mainly composed of a motor, a fan, an air filter and other systems. Its working principle is: the motor and fan in the machine circulate the indoor air, and the polluted air passes through the air filter in the machine to remove or absorb various pollutants. Because the air circulates continuously under the action of the fan, the air purifier has the disadvantage of loud noise or abnormal sound during operation, which makes the user feel uncomfortable, interferes with the user's normal work and life, and affects the user experience. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide an air purifier to solve the technical problem of loud noise or abnormal sound during the operation of the air purifier.

[0005] To achieve the above purpose, the technical solution adopted in this application is:

[0006] In a first aspect, an air purifier is provided, comprising a housing, wherein a filter chamber and a drive chamber are arranged at intervals in the housing, a filter screen is arranged in the filter chamber, and a wind wheel is arranged in the drive chamber; an air inlet hole for external air to enter the filter screen is arranged on the housing, an air inlet structure for air filtered by the filter screen to enter the drive chamber is arranged between the filter chamber and the drive chamber, and an air outlet structure for air in the drive chamber to return to the outside is also arranged on the housing;

[0007] The air inlet structure includes a first air inlet surface and a second air inlet surface. The first air inlet surface extends axially into the hollow area of ​​the filter screen and is coaxially arranged with the wind wheel. The second air inlet surface extends from the periphery of the first air inlet surface to the port of the filter screen facing the wind wheel. Both the first air inlet surface and the second air inlet surface are provided with a plurality of air inlets evenly distributed along the circumferential direction.

[0008] In one embodiment, the first air inlet surface is a plane and is perpendicular to the axial direction of the filter screen;

[0009] Alternatively, the first air inlet surface is a curved surface concave inwardly toward the wind wheel;

[0010] Alternatively, the first air inlet surface is a curved surface that is convex outwardly away from the wind wheel.

[0011] In one embodiment, the second air inlet surface is conical, and the diameter of the second air inlet surface gradually increases in a direction away from the first air inlet surface;

[0012] Alternatively, the second air inlet surface is in an arc shape that is convex relative to the central axis of the second air inlet surface 42 .

[0013] In one embodiment, the first air inlet surface is a plane and is perpendicular to the axial direction of the filter screen; the second air inlet surface is a conical surface, and the diameter of the second air inlet surface gradually increases in a direction away from the first air inlet surface;

[0014] The inclination angle of the second air inlet surface relative to the inner wall of the filter screen is in the range of 15° to 45°; the distance that the first air inlet surface axially extends into the filter screen is in the range of 35mm to 65mm.

[0015] In one embodiment, a flow guide structure is further provided in the driving cavity, and the flow guide structure is arranged between the wind wheel and the air outlet structure and is coaxially arranged with the wind wheel; the wind wheel is a centrifugal wind wheel and has a plurality of first blades distributed in a spiral shape, and the flow guide structure has a plurality of second blades distributed in a spiral shape.

[0016] In one embodiment, the rotation direction of the first blade is opposite to the spiral direction of the second blade.

[0017] In one embodiment, the maximum outer diameter of each of the first blades is smaller than the minimum inner diameter of each of the second blades.

[0018] In one embodiment, the guide structure includes a mounting portion, an inner ring and an outer ring which are coaxially arranged and distributed in sequence from the inside to the outside, the mounting portion is used for installation and fixation, the inner ring is connected to the mounting portion, the outer ring is arranged outside the inner ring, and the second blades are distributed between the inner ring and the outer ring.

[0019] In one embodiment, the second blade extends on the inner ring from one end of the inner ring close to the first blade to one end away from the first blade, along an arc line in a direction away from the second blade in front of it; and the second blade extends on the outer ring from one end of the outer ring close to the first blade to one end away from the first blade, along an arc line in a direction away from the second blade in front of it.

[0020] In one embodiment, the second blades extend along an arc from the inner ring to the outer ring.

[0021] In one embodiment, a motor is disposed in the driving cavity, and the motor is used to drive each of the first blades to rotate. The rotation direction of the motor is opposite to the spiral direction of each of the first blades.

[0022] In one embodiment, the wind wheel includes a mounting frame and a mounting ring spaced apart along its axial direction, the top contour of the mounting frame is matched with the bottom contour of the mounting portion, and each of the first blades is connected between the mounting frame and the mounting ring.

[0023] In one embodiment, the air outlet structure includes a plurality of connecting strips distributed in a circumferential spiral direction, the spiral direction of each connecting strip is opposite to the spiral direction of each first blade, and an air outlet is formed between two adjacent connecting strips.

[0024] In one embodiment, each of the connecting strips is arranged in an outwardly convex arc shape.

[0025] In one embodiment, the air outlet structure includes a center plate and an outer ring surrounding the center plate, and each of the connecting strips is respectively connected between the center plate and the outer ring.

[0026] In one embodiment, a first guide wall connected between the air inlet structure and the outer ring is provided in the driving cavity, and the air passing through the centrifugal wind wheel is centrifugally concentrated between the centrifugal wind wheel and the first guide wall, and is guided by the first guide wall to between each of the second blades.

[0027] In one embodiment, the driving chamber is also provided with a second guide wall connected between the outer ring and the outer ring, and a third guide wall connected between the inner ring and the center plate, and the air flowing through the second blades flows from between the second guide wall and the third guide wall to each of the air outlets.

[0028] In one embodiment, the third guide wall is in an arc-shaped shape convex toward the second guide wall, and the diameter of the third guide wall gradually increases from the center plate toward the inner circle.

[0029] In one embodiment, the outer shell also includes a first sleeve, a second sleeve and a base, the first sleeve is axially connected to the second sleeve, the first sleeve is sleeved outside the first guide wall and the second guide wall, the second sleeve is sleeved outside the filter net, the base cover is arranged at one end of the second sleeve away from the first sleeve, and the second sleeve is circumferentially covered with the air inlet holes.

[0030] The beneficial effect of the air purifier provided by the present application is that the air inlet structure of the air purifier provided in the embodiment of the present application includes a first air inlet surface and a second air inlet surface, the first air inlet surface is located in the hollow area of ​​the filter screen and is coaxially arranged with the wind wheel, that is, the first air inlet surface is protruded from the drive cavity toward the filter screen, and the second air inlet surface extends from the periphery of the first air inlet surface to the port of the filter screen facing the wind wheel, in this way, the sum of the air inlet areas of the first air inlet surface and the second air inlet surface is much larger than the air inlet area when the air inlet structure is only horizontally arranged between the filter cavity and the drive cavity, that is, the air inlet area of ​​the air inlet structure of the present application is increased, thereby reducing the air inlet resistance, that is, under the condition of the same air volume, the noise is reduced and the user experience is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0032] Figure 1 is a three-dimensional schematic diagram of an air purifier provided in one embodiment of the present application;

[0033] Figure 2 yes Figure 1 A longitudinal cross-sectional schematic diagram of an air purifier;

[0034] Figure 3 yes Figure 2 Air flow diagram of the air purifier;

[0035] Figure 4 yes Figure 2 A partial enlarged view of the middle air inlet structure area;

[0036] Figure 5 yes Figure 2 A three-dimensional schematic diagram of the middle air intake structure;

[0037] Figure 6 yes Figure 2 A three-dimensional schematic diagram of the stroke wheel;

[0038] Figure 7 yes Figure 2 A top view of the middle stroke wheel;

[0039] Figure 8 yes Figure 2 A three-dimensional schematic diagram of the middle flow guide structure;

[0040] Fig. 9 yes Figure 2 A top view schematic diagram of the middle flow guide structure;

[0041] Fig.10 yes Figure 2 A top view schematic diagram of the center air outlet structure;

[0042] Fig.11 yes Figure 2 A three-dimensional schematic diagram of the center air outlet structure;

[0043] Fig.12 yes Figure 2 Schematic diagram of the structure of the third guide wall and the mounting tube.

[0044] Among them, the reference numerals in the figure are:

[0045] 10. Shell; 11. Air outlet structure; 111. Connecting strip; 112. Air outlet; 113. Center plate; 114. Outer ring; 12. First sleeve; 13. Second sleeve; 14. Base; 15. Filter chamber; 16. Drive chamber; 17. Air inlet hole; 20. Filter screen; 21. Hollow area; 30. Wind wheel; 31. Mounting frame; 32. Mounting ring; 33. First blade; 40. Air inlet structure; 41. First air inlet surface; 42. Second air inlet surface; 43. Mounting frame; 44. First basic rib; 45. Second basic rib; 46. Third basic rib; 47. Connecting rib; 50. Guide structure; 51. Mounting part; 52. Inner ring; 53. Outer ring; 54. Second blade; 60. Motor; 70. First guide wall; 80. Second guide wall; 90. Third guide wall; 100. Mounting tube. DETAILED DESCRIPTION

[0046] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0047] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0048] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 understood as a limitation on the present application.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0050] In order to illustrate the technical solution described in this application, a detailed description is given below in conjunction with specific drawings and embodiments.

[0051] The air purifier provided in some embodiments of the present application can be placed in homes, shopping malls and office buildings to achieve the purpose of air purification. In addition, the air purifier has low noise and no abnormal sound during use, and will not interfere with the user's normal work and life.

[0052] See also Figure 1 and Figure 2 The air purifier includes a shell 10, which has a filter chamber 15 and a drive chamber 16 arranged at intervals. The filter chamber 15 is provided with a filter screen 20, and the drive chamber 16 is provided with a wind wheel 30; the shell 10 is provided with an air inlet hole 17 for external air to enter the filter screen 20, and an air inlet structure 40 is provided between the filter chamber 15 and the drive chamber 16 for air filtered by the filter screen 20 to enter the drive chamber 16. The shell 10 is also provided with an air outlet structure 11 for the air in the drive chamber 16 to return to the outside.

[0053] The housing 10 is cylindrical, and the filter chamber 15 and the drive chamber 16 are distributed along the axial direction of the housing 10. When the air purifier is erected, the drive chamber 16 is located above the filter chamber 15. The wind wheel 30 is used to drive air circulation so that the outside air enters the filter chamber 15. The filter screen 20 in the filter chamber 15 is used to filter the outside air to achieve the purpose of cleaning and purifying the air. Then the wind wheel 30 drives the purified air from the filter chamber 15 into the drive chamber 16, and returns from the drive chamber 16 to the outside through the air outlet structure 11, so that the user can breathe fresh air.

[0054] See also Figure 2 and Figure 3 The air inlet structure 40 includes a first air inlet surface 41 and a second air inlet surface 42. The first air inlet surface 41 axially extends into the hollow area 21 of the filter 20 and is coaxially arranged with the wind wheel 30. The second air inlet surface 42 extends from the periphery of the first air inlet surface 41 to the end of the filter 20 facing the wind wheel 30. The first air inlet surface 41 and the second air inlet surface 42 are coaxially arranged. The periphery of the first air inlet surface 41 refers to the edge of the first air inlet surface 41. A plurality of air inlets are evenly distributed along the circumferential direction on the first air inlet surface 41 and the second air inlet surface 42.

[0055] Specifically, the filter screen 20 is cylindrical, the axial direction of the filter screen 20 is parallel to the axial direction of the housing 10, a hollow area 21 is provided at the center of the filter screen 20, and air inlet holes 17 are distributed on the housing 10 and are arranged around the outer periphery of the filter screen 20. During operation, outside air enters the filter cavity 15 through the air inlet holes 17, and enters the filter screen 20 through the outer peripheral wall of the filter screen 20 for filtration, and the filtered air enters the hollow area 21, and flows from the hollow area 21 to the driving cavity 16 through the air inlet structure 40.

[0056] See also Figure 2 The central axis of the wind wheel 30, the central axis of the first air inlet surface 41 and the central axis of the filter 20 coincide with each other, the inner diameter of the hollow area 21 of the filter 20 is smaller than the maximum outer diameter of the wind wheel 30, and the maximum diameter of the second air inlet surface 42 is smaller than the inner diameter of the hollow area 21 of the filter 20, so that the air in the hollow area 21 of the filter 20 can be driven by the wind wheel 30 to circulate.

[0057] The air purifier provided in the present application has an air inlet structure 40 including a first air inlet surface 41 and a second air inlet surface 42. The first air inlet surface 41 is located in the hollow area 21 of the filter 20 and is coaxially arranged with the wind wheel 30, that is, the first air inlet surface 41 is protruded from the drive chamber 16 toward the filter 20, and the second air inlet surface 42 extends from the periphery of the first air inlet surface 41 to the port of the filter 20 facing the wind wheel 30. In this way, the sum of the air inlet areas of the first air inlet surface 41 and the second air inlet surface 42 is much larger than the air inlet area when the air inlet structure 40 is only horizontally arranged between the filter chamber 15 and the drive chamber 16. That is, the air inlet area of ​​the air inlet structure 40 of the present application is increased, thereby reducing the air inlet resistance, that is, under the condition of equal air volume, the noise is reduced and the user experience is improved.

[0058] In the specific embodiment, please see Figure 2 , the first air inlet surface 41 is a plane, the first air inlet surface 41 is perpendicular to the axial direction of the filter 20, and the first air inlet surface 41 is circular, the first air inlet surface 41 is coaxial with the wind wheel 30 and is arranged at intervals along the axial direction, and most of the air entering the hollow area 21 of the filter 20 can enter the driving cavity 16 vertically from the first air inlet surface 41. The present application sets the first air inlet surface 41 in a plane, which can reduce the difficulty of manufacturing the air inlet structure 40 while increasing the air inlet area of ​​the entire air inlet structure 40, and has a simple structure and low cost. It can be understood that in other embodiments of the present application, according to actual design and specific requirements, the above-mentioned first air inlet surface 41 may not be set as a plane, but may be set as a curved surface concave in the direction of the wind wheel 30, or may be set as a curved surface convex outward away from the direction of the wind wheel 30, which can also achieve the purpose of increasing the air inlet area of ​​the air inlet structure 40 and reducing noise, which is not the only limitation here.

[0059] In the specific embodiment, please see Figures 2 to 5 , the second air inlet surface 42 is conical, and the caliber of the second air inlet surface 42 gradually increases in the direction away from the first air inlet surface 41, so that part of the air in the hollow area 21 of the filter 20 can enter the drive cavity 16 from between the inner wall of the filter 20 and the outer wall of the second air inlet surface 42 and through the second air inlet surface 42. The present application arranges the second air inlet surface 42 at an angle, so as to facilitate the air to enter the drive cavity 16 from the filter 20, and the air inlet area of ​​the second air inlet surface 42 is increased, thereby increasing the air inlet area of ​​the entire air inlet structure 40 and reducing the air inlet noise. It can be understood that in other embodiments of the present application, according to actual design and specific requirements, the second air inlet surface 42 can also be arranged in a circular arc shape that is convex relative to the central axis of the second air inlet surface 42, which can also increase the air inlet area of ​​the second air inlet surface 42 and reduce the air inlet noise, which is not limited here.

[0060] For details, please refer to Figure 4 , the maximum diameter L1 of the second air inlet surface 42 is 158mm, the inclination angle a1 of the second air inlet surface 42 relative to the inner wall of the filter screen 20 is 32 degrees, and the distance H1 of the first air inlet surface 41 axially extending into the filter screen 20 is 53mm. Through the design of the above structure, the air inlet area of ​​the air inlet structure 40 of the present application is increased by 60% compared with the air inlet area of ​​the air inlet structure 40 which is only horizontally arranged, and under the condition of the same number of connecting ribs 47. The larger the air inlet area, the smaller the air inlet resistance, and the smoother the air flow. Under the same amount of conditions, the smaller the average wind speed passing through the air inlet structure 40, the smaller the wind speed, the smaller the force of air impacting and rubbing the air inlet structure 40, so the noise is reduced. It can be understood that in other embodiments of the present application, the maximum diameter of the second air inlet surface 42 can be adjusted according to the inner diameter of the filter 20, and the inclination angle of the second air inlet surface 42 can also be adjusted up and down, for example, the inclination angle of the second air inlet surface 42 relative to the inner wall of the filter 20 is 15°, 25°, 35° and 45°, etc., and generally meets the requirements within 15° to 45°. Similarly, the distance that the first air inlet surface 41 axially extends into the filter 20 can also be adjusted up and down, for example, 35mm, 45mm, 55mm or 65mm, etc., and generally meets the requirements within the range of 35mm to 65mm, which is not the only limitation here.

[0061] See also Figure 5The air inlet structure 40 includes a first basic rib 44, a second basic rib 45, a third basic rib 46 and a plurality of connecting ribs 47. The first basic rib 44, the second basic rib 45, and the third basic rib 46 are all circular and coaxially arranged. The radii of the first basic rib 44, the second basic rib 45, and the third basic rib 46 gradually increase. The first basic rib 44 and the second basic rib 45 are both arranged on the first air inlet surface 41, and the third basic rib 46 is arranged on the second air inlet surface 42. N connecting ribs 47 are distributed from the center of the first basic rib 44 to the first basic rib 44, and each connecting rib 47 is arranged in a divergent shape. There are 2N connecting ribs 47 connected between the first basic rib 44 and the second basic rib 45, 3N connecting ribs 47 are connected between the second basic rib 45 and the third basic rib 46, and 4N connecting ribs 47 are connected between the third basic rib 46 and the edge of the second air inlet surface 42, and the connecting ribs 47 of adjacent groups are partially connected, and multiple air inlets are formed between each connecting rib 47, and air passes through the air inlets. The present application sets the above-mentioned divergent connecting ribs 47 so that the air inlet is large enough at the air-dense position, and the structural strength of the entire air inlet structure 40 is set strong enough at the air-sparse position, and it can prevent fingers from being inserted into the wind wheel. It can be understood that in other embodiments of the present application, according to actual design requirements, the number of the above-mentioned basic ribs and connecting ribs 47 can be appropriately increased or decreased, and the number of connecting ribs 47 between each basic rib can also not increase in multiples, which is not limited here.

[0062] See also Figure 2 and Figure 5 The air inlet structure 40 further includes a mounting frame 43, which is disposed around an edge of one end of the second air inlet surface 42 away from the first air inlet surface 41 and is integrally connected to the second air inlet surface 42. The mounting frame 43 is disposed above one end of the filter screen 20 and is fixedly connected to the housing 10, thereby mounting the air inlet structure 40 on the housing 10 and dividing the housing 10 into a filter chamber 15 and a drive chamber 16. In addition, the mounting frame 43 also has the function of supporting the first guide wall 70, and the position of the first guide wall 70 will be described below.

[0063] In the specific embodiment, please see Figure 2 and Figures 6 to 9A guide structure 50 is also provided in the driving cavity 16. The guide structure 50 is fixed relative to the housing 10. The guide structure 50 is provided between the wind wheel 30 and the air outlet structure 11 and is coaxially provided with the wind wheel 30. The guide structure 50 is used to guide the air driven by the wind wheel 30 to the air outlet structure 11; the wind wheel 30 is a centrifugal wind wheel 30. The centrifugal wind wheel 30 can drive the air in a centrifugal direction. The centrifugal wind wheel 30 has a plurality of first blades 33 distributed in a spiral. The guide structure 50 has a plurality of second blades 54 distributed in a spiral, and the rotation direction of the first blade 33 is opposite to the spiral direction of the second blade 54, that is, when the first blade 33 rotates clockwise, the second blade 54 is distributed in a counterclockwise spiral, and when the first blade 33 rotates counterclockwise, the second blade 54 is distributed in a clockwise spiral. In the present application, the first blade 33 rotates clockwise and the second blade 54 is distributed in a counterclockwise spiral. Under the action of the rotating first blade 33, the air is centrifugally distributed around the periphery of the first blade 33. Since the second blade 54 rotates in the opposite direction to the first blade 33, the local wind speed at the periphery is reduced, making the overall wind speed more balanced and reducing the friction sound between the air and the second blade 54 caused by the high wind speed.

[0064] In the specific embodiment, please see Figure 2 , Figure 7 and Fig. 9 , the maximum outer diameter D1 of each first blade 33 is smaller than the minimum inner diameter D2 of each second blade 54. Specifically, the maximum outer diameter D1 of each first blade 33 refers to the diameter of the circle of the outermost edge after each first blade 33 is distributed along the spiral; and the minimum inner diameter D2 of each second blade 54 refers to the diameter of the innermost edge after each second blade 54 is distributed along the spiral. When the maximum outer diameter D1 of each first blade 33 is smaller than the minimum inner diameter D2 of each second blade 54, the air centrifugally driven by the first blade 33 can just be guided and diverted by the second blade 54, thereby improving the efficiency of guiding and diverting by the second blade 54.

[0065] In the specific embodiment, please see Figure 2 , Figure 8 and Fig. 9 The guide structure 50 includes a mounting portion 51, an inner ring 52, an outer ring 53 and second blades 54. The mounting portion 51, the inner ring 52 and the outer ring 53 are coaxially arranged and distributed in sequence from the inside to the outside. The mounting portion 51 is used for installation and fixation. The inner ring 52 is connected to the mounting portion 51. The outer ring 53 is arranged outside the inner ring 52. The second blades 54 are distributed between the inner ring 52 and the outer ring 53, that is, each second blade 54 is connected between the inner ring 52 and the outer ring 53, respectively. In this way, the second blades 54 are limited to the upper periphery of the first blade 33 by the inner ring 52 and the outer ring 53, thereby realizing the second blade 54 guiding the air.

[0066] See also Figure 8 and Fig. 9 , each second blade 54 is spirally distributed in the counterclockwise direction, and the second blade 54b is located in front of the second blade 54a in the spiral direction. The second blade 54a extends on the inner ring 52 from one end of the inner ring 52 close to the first blade 33 to one end away from the first blade 33, along an arc line away from the second blade 54b in front of it. Similarly, the second blade 54a extends on the outer ring 53 from one end of the outer ring 53 close to the first blade 33 to one end away from the first blade 33, along an arc line away from the second blade 54b in front of it. Specifically, the extension arc line of the second blade 54a is M1, and the extension arc line M1 extends from the bottom end to the top end of the second blade 54a along the arc line direction away from the second blade 54b, so that the second blade 54a has a vertical branch direction and a branch direction pointing to the center. When the air centrifugally driven by the first blade 33 enters the second blade 54, it will partially contact the front of the second blade 54. In this way, the second blade 54 can reverse this part of the air and guide it toward the center, so that a part of the peripheral high-speed air flow is dispersed toward the center, so that the components of the center and the edge are more uniform, which can reduce the edge wind speed.

[0067] See also Fig. 9 The second blade 54 extends along an arc from the inner ring 52 to the outer ring 53. Specifically, the radius of the arc is 120 mm. By extending the second blade 54 along the arc, the surface of the second blade 54 is more balanced and soft, and the force of the second blade 54 on the air is softer, thereby reducing the friction between the second blade 54 and the air and reducing noise.

[0068] In the specific embodiment, please see Figure 2 A motor 60 is provided in the driving chamber 16, and the motor 60 is used to drive each first blade 33 to rotate. The rotation direction of the motor 60 is opposite to the spiral direction of each first blade 33, that is, the centrifugal wind wheel 30 is a backward centrifugal wind wheel 30. The backward centrifugal wind wheel has the advantages of small vibration and low noise, so that the air purifier of the present application has low noise during use.

[0069] See also Figure 2 , Figure 6 and Figure 7The wind wheel 30 includes a mounting frame 31 and a mounting ring 32. The mounting frame 31 and the mounting ring 32 are arranged at intervals along the axial direction of the wind wheel 30. The mounting frame 31 is installed on the rotating shaft of the motor 60. The motor 60 drives the mounting frame 31 and thus drives the entire wind wheel 30 to rotate. The top contour of the mounting frame 31 is adapted to the bottom contour of the mounting portion 51, and each first blade 33 is connected between the mounting frame 31 and the mounting ring 32. Specifically, the mounting portion 51 is bowl-shaped and convexly arranged in the direction of the mounting frame 31. The shapes of the mounting frame 31 and the mounting portion 51 are adapted. The mounting frame 31 is movably arranged, the mounting portion 51 is fixedly arranged, and the mounting frame 31 and the mounting portion 51 are always arranged in coordination with each other up and down. In addition, by convexly arranging the mounting portion 51, a lot of space is reserved above the mounting portion 51, so as to facilitate the installation of the motor 60 and other structures, thereby making the entire air purifier structure compact and compact.

[0070] In the specific embodiment, please see Figure 2 , Fig.10 and Fig.11 The air outlet structure 11 includes a plurality of connecting strips 111 that are spirally distributed along the circumferential direction. The spiral direction of each connecting strip 111 is the same as the spiral direction of each second blade 54, and an air outlet 112 is formed between two adjacent connecting strips 111. In the present application, by setting the spiral direction of the connecting strip 111 to be the same as the spiral direction of the second blade 54, the air guided by the second blade 54 can flow out from each air outlet 112 better, thereby reducing the air outlet resistance, improving the air outlet efficiency, and reducing the noise.

[0071] See also Figure 2 and Fig.11 , each connecting strip 111 is arranged in an outwardly convex arc shape, which increases the length of the connecting strip 111, and further increases the total area of ​​each air outlet 112. Since the calculation formula of the air volume (Q) is: Q=VA, where V represents the wind speed and A represents the cross-sectional area. That is, under the condition of a constant wind speed, increasing the air outlet area can increase the air volume. In addition, the larger the air outlet area, the smaller the air outlet resistance, and the smoother the air flow. Under the condition of the same air volume, the smaller the average wind speed passing through the air outlet structure 11, and the smaller the wind speed, the smaller the force of the air impacting the connecting strip 111, thereby reducing noise.

[0072] For details, please refer to Figure 2 The longitudinal cross-section of each connecting strip 111 is semicircular arch-shaped, so that the total area of ​​each air outlet 112 is 25% larger than the air outlet area of ​​the planar air outlet structure 11, thereby achieving the purpose of reducing noise.

[0073] See also Figure 2 , Fig.10 and Fig.11The air outlet structure 11 includes a center plate 113 and an outer ring 114. The center plate 113 is in the shape of a circular plate and is located at the top center of the entire housing 10. The outer ring 114 is arranged outside the center plate 113. The outer ring 114 is used to connect with other parts of the housing 10. Each connecting strip 111 is connected between the center plate 113 and the outer ring 114. The air outlet structure 11 is connected between the outer ring 114 and the center plate 113 through the connecting strip 111, and each air outlet 112 just corresponds to the position of each second blade 54, which improves the air outlet efficiency of the air outlet 112, and at the same time realizes the connection between the air outlet structure 11 and other parts of the housing 10, and reserves the position of the center plate 113 to realize the user's operation and control function of the air purifier.

[0074] In the specific embodiment, please see Figure 2 A first guide wall 70 is provided in the driving cavity 16. The first guide wall 70 is connected between the air inlet structure 40 and the outer ring 53. Specifically, the first guide wall 70 is connected between the mounting frame 43 and the outer ring 53. The mounting frame 43 supports the first guide wall 70. In this way, the air passing through the centrifugal wind wheel 30 is centrifugally concentrated between the centrifugal wind wheel 30 and the first guide wall 70, and is guided by the first guide wall 70 to between each second blade 54. The first guide wall 70 is slightly inclined, and is arc-shaped at a position corresponding to the lower end of the first blade 33. This is not only conducive to the fixed connection between the first guide wall 70 and the mounting frame 43, but also has a buffering effect on the air, reducing friction and noise.

[0075] See also Figure 2 A second guide wall 80 and a third guide wall 90 are also provided in the driving cavity 16. The second guide wall 80 is connected between the outer ring 53 and the outer ring 114, and the third guide wall 90 is connected between the inner ring 52 and the center plate 113. The second guide wall 80 and the third guide wall 90 are both rotating bodies and are coaxially arranged. The air flowing through the second blades 54 flows from between the second guide wall 80 and the third guide wall 90 to each air outlet 112. In this way, through the arrangement of the second guide wall 80 and the third guide wall 90, the air passing through each second blade 54 can be guided to the air outlet 112, thereby improving the air outlet efficiency.

[0076] See also Figure 2 and Fig.12 The third guide wall 90 is in an arc-shaped outwardly convex shape toward the second guide wall 80, and the diameter of the third guide wall 90 gradually increases from the center plate 113 toward the inner circle 52. Through the above-mentioned structural design of the third guide wall 90, the air flowing out from each second blade 54 flows more smoothly to the air outlet 112, reducing friction noise.

[0077] See also Figure 2 and Fig.12The third guide wall 90 is provided with a mounting tube 100 at its center. The mounting tube 100 is recessed at the center of the third guide wall 90. The mounting tube 100 is fixedly connected to the center plate 113. The accommodating cavity between the mounting tube 100 and the center plate 113 is used to place a circuit board, which can provide a display interface and receive user operation instructions. The third guide wall 90, the mounting tube 100, the inner ring 52 and the mounting portion 51 are surrounded to form a mounting cavity. The motor 60 is installed in the mounting cavity, and a mounting seat is provided on the mounting tube 100. The motor 60 is installed on the mounting seat, and the mounting portion 51 is also fixedly connected to the mounting seat.

[0078] In the specific embodiment, please see Figure 1 and Figure 2 The housing 10 further includes a first sleeve 12, a second sleeve 13 and a base 14. The first sleeve 12 is connected flush with the second sleeve 13 along the axial direction. The first sleeve 12 is sleeved outside the first guide wall 70 and the second guide wall 80. The outer ring 114 is connected to the end of the first sleeve 12 away from the second sleeve 13. The second sleeve 13 is sleeved outside the filter 20. The base 14 is covered on the end of the second sleeve 13 away from the first sleeve 12. The base 14 is arranged on the end of the filter 20 away from the wind wheel 30. The second sleeve 13 is circumferentially covered with air inlet holes 17.

[0079] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An air purifier, characterized in that: The invention comprises a shell, wherein the shell has a filter chamber and a drive chamber arranged at intervals, the filter chamber is provided with a cylindrical filter screen, and the drive chamber is provided with a wind wheel; the shell is provided with an air inlet hole for external air to enter the filter screen, an air inlet structure for air filtered by the filter screen to enter the drive chamber is provided between the filter chamber and the drive chamber, and the shell is also provided with an air outlet structure for the air in the drive chamber to return to the outside; The air inlet structure comprises a first air inlet surface and a second air inlet surface, wherein the first air inlet surface extends into the hollow area of ​​the filter screen along the axial direction thereof and is coaxially arranged with the wind wheel, and the second air inlet surface extends from the periphery of the first air inlet surface to the end of the filter screen facing the wind wheel; a plurality of air inlets are evenly distributed along the circumferential direction on both the first air inlet surface and the second air inlet surface; The wind wheel is a centrifugal wind wheel and has a plurality of first blades distributed in a spiral manner. A motor is arranged in the driving cavity, and the motor is used to drive each of the first blades to rotate. The rotation direction of the motor is opposite to the spiral direction of each of the first blades. The air outlet structure includes a plurality of connecting strips that are distributed in a circumferential spiral direction. The spiral direction of each connecting strip is opposite to the spiral direction of each first blade, and an air outlet is formed between two adjacent connecting strips.

2. The air purifier according to claim 1, characterized in that: The first air inlet surface is a plane and is perpendicular to the axial direction of the filter screen; Alternatively, the first air inlet surface is a curved surface concave inwardly toward the wind wheel; Alternatively, the first air inlet surface is a curved surface that is convex outwardly away from the wind wheel.

3. The air purifier according to claim 1, characterized in that: The second air inlet surface is conical, and the diameter of the second air inlet surface gradually increases in a direction away from the first air inlet surface; Alternatively, the second air inlet surface is in an arc shape that is convex relative to the central axis of the second air inlet surface.

4. The air purifier according to claim 1, characterized in that: The first air inlet surface is a plane and is perpendicular to the axial direction of the filter screen; the second air inlet surface is a conical surface, and the diameter of the second air inlet surface gradually increases in a direction away from the first air inlet surface; The inclination angle of the second air inlet surface relative to the inner wall of the filter screen is in the range of 15° to 45°; the distance that the first air inlet surface axially extends into the filter screen is in the range of 35mm to 65mm.

5. The air purifier according to claim 1, characterized in that: Each of the connecting strips is arranged in an outwardly convex arc shape.

6. The air purifier according to claim 5, characterized in that: The air outlet structure includes a central plate and an outer ring surrounding the central plate, and each of the connecting strips is respectively connected between the central plate and the outer ring.

7. The air purifier according to claim 6, characterized in that: The shell also includes a first sleeve, a second sleeve and a base. The first sleeve is axially connected to the second sleeve. The second sleeve is sleeved outside the filter. The base cover is arranged at one end of the second sleeve away from the first sleeve. The second sleeve is circumferentially provided with the air inlet hole.

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