Air duct assembly, air purifier and air duct assembly control method

Abstract

The present application relates to the technical field of air purifiers, and specifically provides a wind channel assembly, an air purifier and a wind channel assembly control method.The wind channel assembly comprises a centrifugal fan, a first shell and a flow guide piece;the centrifugal fan is provided in multiple parallel and sequential intervals;the first shell is arranged outside the centrifugal fan and is connected to the centrifugal fan;the first shell is provided with multiple wind channels corresponding to the centrifugal fan in one-to-one correspondence;the wind channel comprises a first air inlet and multiple first air outlets;the first air inlet is used for introducing airflow filtered by a target filter with a target resistance into the wind channel;the multiple first air outlets are arranged on the outer periphery of the centrifugal fan;the flow guide piece is arranged in the first shell and is connected to the first shell;the flow guide piece is arranged between two adjacent centrifugal fans to separate the wind channels;the flow guide piece is provided with flow guide concave arc surfaces on both sides, and the flow guide concave arc surfaces are configured to guide the airflow of a target fan to the first air outlet. The present application can provide large airflow while taking into account low noise and energy consumption.

Description

Technical Field

[0001] This invention relates to the field of air purifier technology, and in particular to air duct components, air purifiers, and air duct component control methods. Background Technology

[0002] Air purifiers are used to purify the air. During operation, an internal fan draws air to a filter, where it is filtered before the purified air is discharged. Currently, most air purifiers use a centralized air outlet structure with a volute at the outlet. This is primarily to increase the static pressure in the duct, thereby overcoming the filter's resistance. However, this structure is no longer suitable for filters with lower resistance, resulting in high noise and energy consumption. Summary of the Invention

[0003] The air duct assembly, air purifier, and air duct assembly control method provided in this invention at least solve the problems of high noise and high energy consumption in existing air duct assemblies when facing low-resistance filters. By adjusting the air outlet structure of the air duct assembly and setting the guide component, the air volume is increased while taking into account low noise and energy consumption.

[0004] In a first aspect, the present invention provides an air duct assembly, including multiple centrifugal fans arranged side by side; the multiple centrifugal fans are arranged sequentially at intervals along a first direction; wherein the axial direction of the centrifugal fans is parallel to a second direction, and the second direction is perpendicular to the first direction; a first housing is disposed outside the centrifugal fans and connected to the centrifugal fans; the first housing is provided with multiple air ducts, each corresponding to one of the centrifugal fans; each air duct includes a first air inlet and multiple first air outlets communicating with each other; along the second direction, the first air inlet is disposed on one side of the air inlet surface of the centrifugal fan, and the first air inlet is used to introduce a target resistance through the air duct. The centrifugal fan is provided with airflow filtered by a standard filter; a plurality of first air outlets are disposed on the outer periphery of the centrifugal fan along a direction perpendicular to the second direction; and a guide is disposed within the first housing and connected to the first housing; along the first direction, the guide is disposed between two adjacent centrifugal fans to separate the air duct; along the first direction, both sides of the guide are provided with guide concave arc surfaces, which are configured to guide the airflow of the target fan to the adjacent fan to the first air outlet; wherein, the target fan is the centrifugal fan corresponding to the guide concave arc surface, and the adjacent fan is the centrifugal fan facing away from the guide concave arc surface.

[0005] In one embodiment of the present invention, on a cross section perpendicular to the second direction, the shape of the curved segment of the guide concave arc surface is set to be the same as the shape of the involute segment of the target fan.

[0006] In one embodiment of the present invention, each of the air ducts includes at least two first air outlets arranged opposite each other along a third direction; wherein the third direction is perpendicular to the first direction and the second direction respectively; along the first direction, both sides of the guide member are provided with guide convex arc surfaces; along the third direction, the guide convex arc surface is disposed on one side of the guide concave arc surface; in a cross section perpendicular to the second direction, the curve segment shape of the guide convex arc surface and the curve segment shape of the guide concave arc surface are set to be centrally symmetrical about a target point, and the curve segment of the guide convex arc surface is tangent to the curve segment of the guide concave arc surface; wherein, in a cross section perpendicular to the second direction, the target point is located on the line connecting the axes of two adjacent centrifugal fans.

[0007] In one embodiment of the present invention, along a third direction, both ends of the flow guide are provided with arc surfaces, and both surfaces of the flow guide along the first direction are connected to the arc surfaces through arc transitions.

[0008] In one embodiment of the present invention, along the second direction, a first rotating part is provided on both sides of the flow guide; along the third direction, the first rotating part is provided in the middle region of the flow guide; the first housing is provided with a second rotating part corresponding to the first rotating part, and the first rotating part and the second rotating part are rotatably connected.

[0009] In one embodiment of the present invention, the guide element is configured to adjust the minimum radial dimension D of the guide concave arc surface by rotation, wherein the minimum radial dimension D satisfies the relationship 0.05*L≤D≤0.15*L; wherein L is the outer diameter of the centrifugal fan; the minimum radial dimension is the minimum difference between the distance H from a point on the guide concave arc surface to the center of the corresponding target fan and the outer diameter L of the centrifugal fan.

[0010] In one embodiment of the present invention, a limiting portion is provided on both sides of the flow guide along the second direction; and the size of the flow guide is smaller than the size of the limiting portion along the first direction.

[0011] In one embodiment of the present invention, the target size of the limiting portion is set to gradually decrease along a first target direction; wherein, the first target direction is the direction in which the end of the limiting portion in a third direction points to the center of the limiting portion; the target size is the size of the limiting portion in a second target direction, the second target direction being perpendicular to both the first target direction and the second direction.

[0012] In one embodiment of the present invention, along the second direction, the limiting surface of the limiting portion near the flow guide is provided with a flow-guiding chamfer; the flow-guiding chamfer is provided at the edge of the limiting portion, and the flow-guiding chamfer is circumferentially arranged around the limiting surface.

[0013] In one embodiment of the present invention, along the second direction, at least one side of the flow guide is provided with a threaded hole; along the third direction, the threaded hole is provided at the edge of the flow guide; the first housing is provided with a limiting strip hole corresponding to the threaded hole, a threaded member is provided in the limiting strip hole, the threaded member is movable relative to the limiting strip hole along the extension direction of the limiting strip hole, and the threaded member is threadedly connected to the threaded hole.

[0014] In one embodiment of the present invention, along the second direction, a first auxiliary member and a second auxiliary member are provided on the side of the first housing away from the guide member; the first auxiliary member is connected to the first housing, and the first auxiliary member is provided with a guide groove, the groove wall surface of the guide groove is provided with a plurality of first meshing teeth, the plurality of first meshing teeth being arranged sequentially along the extension direction of the guide groove; the second auxiliary member is connected to the threaded member, the second auxiliary member is movable relative to the guide groove along the extension direction of the guide groove, the second auxiliary member is provided with a second meshing tooth, the second meshing tooth engaging with the first meshing tooth.

[0015] In one embodiment of the present invention, the second auxiliary component includes a connected auxiliary body and a spring arm, the spring arm being disposed between the auxiliary body and the first meshing tooth, and the second meshing tooth being disposed on the spring arm.

[0016] In one embodiment of the present invention, the guide groove has a notch on its groove wall.

[0017] In one embodiment of the present invention, along the second direction, a plurality of sliding contact ribs are provided on the side of the second auxiliary member near the first housing, the extending direction of the sliding contact ribs is the same as the extending direction of the guide groove, and the sliding contact ribs are slidably connected to the first housing.

[0018] In one embodiment of the present invention, the outer surface of the first housing along the second direction is provided with a reinforcing rib grid; the first auxiliary member is disposed in the reinforcing rib grid, the side wall surface of the first auxiliary member abuts against the inner wall surface of the reinforcing rib grid, and the first auxiliary member is detachably connected to the first housing.

[0019] In one embodiment of the present invention, the operating frequency of each centrifugal fan is set to be different at each moment.

[0020] In one embodiment of the present invention, the centrifugal fan includes a centrifugal impeller, and centrifugal blades are provided on both sides of the centrifugal impeller along the second direction, and the blades of the centrifugal blades on both sides of the centrifugal impeller have the same bending direction; the first housing includes two detachably connected housing parts, and the two housing parts are arranged opposite to each other along the second direction; each housing part is provided with a first air inlet, and a first air inlet grille is provided at the first air inlet; along the first direction, a first air outlet half-port is provided on both sides of the housing part, and the corresponding two first air outlet half-ports are combined to form the first air outlet; along the third direction, a second air outlet half-port is provided on both sides of the housing part, and the corresponding two second air outlet half-ports are combined to form the first air outlet.

[0021] In a second aspect, the present invention also provides an air purifier, including a target filter and an air duct assembly as described in any one of the above; along the second direction, at least a portion of the target filter is disposed on the air inlet side of the first air inlet, and the filtration resistance of the target filter is set as the target resistance.

[0022] In one embodiment of the present invention, a second housing is further included, disposed outside the target filter and the air duct assembly, and connected to the target filter and the air duct assembly; the second housing is provided with a second air inlet corresponding to the first air inlet and a second air outlet corresponding to the first air outlet; a second air inlet grille is provided at the second air inlet and an air outlet grille is provided at the second air outlet.

[0023] In one embodiment of the present invention, the target filter is configured as an electronic filter, the electronic filter including a high-voltage electric field element and an ion generator; the high-voltage electric field element is disposed on the air inlet side of the first air inlet and is used to adsorb charged pollutants; the ion generator is disposed on the first air outlet and is used to generate charged ions, the charged ions being used to charge the pollutants.

[0024] Thirdly, the present invention also provides a method for controlling a duct assembly, applied to the duct assembly described in any one of the above claims, comprising the steps of: controlling a centrifugal fan to rotate in response to a working command; wherein, multiple centrifugal fans are arranged side by side, and along a first direction, the multiple centrifugal fans are arranged sequentially at intervals; the axial direction of the centrifugal fan is parallel to a second direction, and the second direction is perpendicular to the first direction; a first housing is provided outside the centrifugal fan, the first housing is connected to the centrifugal fan, the first housing is provided with multiple air ducts, and each air duct corresponds one-to-one with a centrifugal fan; each air duct includes a connected first air inlet and multiple first air outlets, and along the second direction, the first air inlet is located on one side of the air inlet surface of the centrifugal fan. Along a direction perpendicular to the second direction, a plurality of first air outlets are disposed on the outer periphery of the centrifugal fan; a guide member is disposed inside the first housing, and the guide member is connected to the first housing; along the first direction, the guide member is disposed between two adjacent centrifugal fans to separate the air duct; along the first direction, both sides of the guide member are provided with guide concave arc surfaces; the airflow filtered by the target filter with target resistance enters the air duct from the first air inlet; the target fan guides the airflow of the adjacent fan to the first air outlet through the corresponding guide concave arc surface; wherein, the target fan is the centrifugal fan corresponding to the guide concave arc surface, and the adjacent fan is the centrifugal fan facing away from the guide concave arc surface.

[0025] In one embodiment of the present invention, before controlling the centrifugal fan to rotate in response to a working command, the method further includes the steps of: controlling the centrifugal fan to rotate at a first target speed in response to a first test command; controlling the guide member to rotate relative to the first housing to determine the maximum air volume of the duct assembly when the guide member is at different rotation angles; and determining a first speed range of the centrifugal fan during operation based on the target air volume, the rotation angle of the guide member, and the corresponding maximum air volume.

[0026] In one embodiment of the present invention, before controlling the centrifugal fan to rotate in response to a working command, the method further includes the steps of: controlling the centrifugal fan to rotate at a second target speed in response to a second test command; acquiring the air volume of the duct assembly and the corresponding filtration efficiency of the target filter; and determining a second speed range of the centrifugal fan during operation based on the air volume and the filtration efficiency.

[0027] In one embodiment of the present invention, controlling the rotation of centrifugal fans in response to a working command includes the step of: controlling the operating frequency of each centrifugal fan to be different at each moment.

[0028] Compared with the prior art, the above-described technical solution of the present invention has the following advantages:

[0029] The duct assembly, air purifier, and duct assembly control method described in this invention, targeting a filter with a target resistance, utilizes a first housing and a guide vane to create multiple first air outlets in the duct of each centrifugal fan. During operation, the centrifugal fan rotates, causing the airflow filtered by the target filter to enter through the first air inlet. The airflow is then discharged from the multiple first air outlets through the interaction of the centrifugal fan, the inner wall of the first housing, and the guide vane's concave arc surface, delivering air in multiple directions perpendicular to the second direction, forming a wide, diffused airflow. This allows for rapid agitation and mixing of a large area of ​​air, resulting in fast purification. By using a guide arc surface instead of a volute, the air outlet area of ​​the first air outlets is made uniform, preventing airflow interaction with the volute. The guide arc surface also ensures more uniform airflow direction and velocity, preventing severe eddies and whistling, resulting in low overall aerodynamic noise. Furthermore, during the testing phase, the static pressure and airflow of the duct are adjusted, and the motor speed is appropriately reduced to lower power consumption and achieve energy savings. Attached Figure Description

[0030] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0031] Figure 1 This is a schematic diagram of the air duct assembly in a preferred embodiment of the present invention.

[0032] Figure 2 This is an exploded structural diagram of the air duct assembly in a preferred embodiment of the present invention.

[0033] Figure 3 This is a partial structural schematic diagram of the air duct assembly in a preferred embodiment of the present invention.

[0034] Figure 4 This is one of the cross-sectional structural schematic diagrams of the air duct assembly in a preferred embodiment of the present invention.

[0035] Figure 5 This is the second cross-sectional structural schematic diagram of the air duct assembly in a preferred embodiment of the present invention.

[0036] Figure 6 This is one of the cross-sectional structural schematic diagrams of the guide member in a preferred embodiment of the present invention.

[0037] Figure 7 This is a schematic diagram of the flow guide in a preferred embodiment of the present invention.

[0038] Figure 8 This is a partial structural schematic diagram of the guide component in a preferred embodiment of the present invention.

[0039] Figure 9This is the second cross-sectional structural schematic diagram of the guide component in a preferred embodiment of the present invention.

[0040] Figure 10 This is a second partial structural schematic diagram of the first housing in a preferred embodiment of the present invention.

[0041] Figure 11 This is one of the partial structural schematic diagrams of the first housing in a preferred embodiment of the present invention.

[0042] Figure 12 This is a schematic diagram of the structure of the first auxiliary component and the second auxiliary component in a preferred embodiment of the present invention.

[0043] Figure 13 This is a schematic diagram of the structure of the second auxiliary component in a preferred embodiment of the present invention.

[0044] Figure 14 This is a schematic diagram of the structure of an air purifier in a preferred embodiment of the present invention.

[0045] Figure 15 This is a schematic diagram of the exploded structure of an air purifier in a preferred embodiment of the present invention.

[0046] Figure 16 This is a flowchart illustrating the air duct component control method in a preferred embodiment of the present invention.

[0047] The above-mentioned figures include the following reference numerals: D1, first direction; D2, second direction; D3, third direction; 10, centrifugal fan; 101, target fan; 102, adjacent fan; 11, centrifugal impeller; 111, centrifugal blade; 20, first housing; 201, housing body; 21, first air inlet; 22, first air outlet; 221, first half-outlet; 222, second half-outlet; 23, second rotating part; 24, limiting strip hole; 25, first air inlet grille; 26, reinforcing rib; 30, guide element; 31, guide concave arc surface; 32, guide convex arc surface; 33, circular arc surface; 34, first rotating part; 3 5. Limiting part; 351. Limiting surface; 352. Drainage chamfer; 36. Threaded hole; 41. High voltage electric field component; 42. Ion generator; 51. Threaded component; 52. First auxiliary component; 521. Guide groove; 522. First meshing tooth; 523. Notch; 53. Second auxiliary component; 531. Auxiliary body; 5311. Sliding contact rib; 532. Elastic arm; 5321. Second meshing tooth; 60. Second housing; 601. First sub-housing; 602. Second sub-housing; 603. Third sub-housing; 604. Fourth sub-housing; 61. Second air inlet; 62. Second air outlet; 63. Second air inlet grille; 64. Air outlet grille. Detailed Implementation

[0048] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0049] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0050] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0051] It should be noted that in relevant air purifiers, the duct assembly typically uses dual fans for pressurization. Simultaneously, a volute is installed at the air outlet of the duct to prevent the high-pressure airflow from flowing back into the low-pressure area of ​​the fan impeller and to narrow the outlet. Thus, the airflow accelerates within the volute and exits rapidly in a jet-like manner from the small outlet, generating higher static pressure and airflow at the outlet to overcome the filter's resistance. However, this also increases the interaction between the airflow and the volute, resulting in greater aerodynamic noise, i.e., a whistling sound, which creates an "impure" auditory sensation.

[0052] As filters continue to advance, their resistance is constantly decreasing. Conventional High-Efficiency Particulate Air (HEPA) filters have an initial resistance of approximately 50 to 150 Pa, which increases sharply with use, typically designed to reach 200 to 300 Pa. Low-resistance HEPA filters, on the other hand, can achieve resistance around 100 Pa. This reduction in filter resistance means that in some scenarios, the pressure and airflow ratio in related duct components, based on a volute-type pressurized structure, is no longer optimally matched. This results in wasted design parameters, relatively high motor energy consumption, and high noise levels.

[0053] To solve the above problems, refer to Figure 1 and Figure 2 As shown, an embodiment of the present invention provides an air duct assembly. The air duct assembly includes a centrifugal fan 10, a first housing 20, and a flow guide 30.

[0054] The centrifugal fan 10 includes a centrifugal impeller 11. The centrifugal fan 10 uses the centrifugal impeller 11 to redirect airflow entering along its axial direction to discharge radially. In this embodiment of the invention, multiple centrifugal fans 10 are arranged side-by-side along a first direction D1, with the multiple centrifugal fans 10 arranged sequentially at intervals. The multiple centrifugal fans 10 cooperate with each other to achieve 360° omnidirectional airflow and a large air volume. Preferably, all centrifugal fans 10 rotate in the same direction.

[0055] The axial direction of the centrifugal fan 10 can be understood as the axial direction of the centrifugal impeller 11 of the centrifugal fan 10, or the axial direction of the motor. The axial direction of the centrifugal fan 10 is parallel to the second direction D2, and the second direction D2 is perpendicular to the first direction D1.

[0056] The centrifugal fans 10 are arranged side by side, meaning that their axes are parallel to each other. Of course, in some special cases, the axes of the centrifugal fans 10 can also be kept at a certain angle.

[0057] Preferably, in actual use, the first direction D1 is set to be parallel to the vertical direction in order to utilize the space in the vertical direction and reduce the footprint of the air purifier.

[0058] The first housing 20 is disposed outside and connected to the centrifugal fan 10. The first housing 20 primarily supports the centrifugal fan 10, restricts the relative positions of each centrifugal fan 10, and provides mechanical protection for the centrifugal fan 10. Preferably, the first housing 20 is provided with a corresponding mounting structure for mounting and fixing the centrifugal fan 10. For example, the two can be snap-fitted together, glued together, or tightened with screws.

[0059] The first housing 20 is provided with multiple air ducts, each corresponding to a centrifugal fan 10. The air ducts can be configured as regular structures, such as through holes with a square or circular cross-section; or they can be configured as irregular structures, for example, by removing a portion from the solid part of the first housing 20 to obtain the air duct. In this embodiment of the invention, the air duct of each centrifugal fan 10 is mainly formed by the inner wall surface of the first housing 20 and the corresponding arc surface of the guide member 30.

[0060] The air duct includes a first air inlet 21 and multiple first air outlets 22. Along the second direction D2, the first air inlet 21 is located on the air inlet side of the centrifugal fan 10, and the first air inlet 21 is used to introduce airflow into the air duct.

[0061] With a single first air inlet 21, the centrifugal fan 10 also has an air inlet surface. The air inlet surface is the axial end face of the centrifugal impeller 11 of the centrifugal fan 10, on which centrifugal blades 111 are provided. During operation, the airflow enters through this single first air inlet 21 and is discharged from multiple first air outlets 22 under the action of the centrifugal fan 10.

[0062] In this case, the first air inlet 21 of each air duct can be set to one or two. When two first air inlets 21 are set, the centrifugal fan 10 needs to be set to a double suction structure, which includes two air inlet surfaces, that is, centrifugal blades 111 are provided on both axial end faces of the centrifugal impeller 11, and the blades of the centrifugal blades 111 have the same bending direction.

[0063] Understandably, the bending direction of the blades in both sets of centrifugal blades 111 is the same as the direction of motor rotation. Thus, during operation, airflow can enter from both first air inlets 21 simultaneously and be discharged from multiple first air outlets 22 under the action of the centrifugal fan 10.

[0064] Preferably, for each air duct, at least two first air outlets 22 are provided. Multiple first air outlets 22 are arranged on the outer periphery of the centrifugal fan 10 along a direction perpendicular to the second direction D2. The air outlet area of ​​each first air outlet 22 can be the same or different.

[0065] Reference Figure 3 and Figure 4 As shown, taking a duct assembly with two centrifugal fans 10 as an example, each duct on its first housing 20 has three first air outlets 22. Thus, a total of six first air outlets 22 are included. Two oppositely positioned first air outlets 22 can be considered as a group, i.e., three groups: one group of outlets oppositely positioned along the first direction D1, and two groups of outlets oppositely positioned along the third direction D3. The third direction D3 is perpendicular to both the first direction D1 and the second direction D2.

[0066] Reference Figure 5 As shown, taking a duct assembly with three centrifugal fans 10 as an example, the first air outlet 22 of the duct on its first housing 20 can be divided into two types: a duct with three first air outlets 22 and a duct with two first air outlets 22. The duct with three first air outlets 22 is located at both ends of the first housing 20 along the first direction D1, while the duct with two first air outlets 22 is the middle duct.

[0067] Preferably, in this embodiment of the invention, the first housing 20 is configured as a cuboid-like structure. The height direction of the first housing 20 is parallel to the first direction D1, the width direction of the first housing 20 is parallel to the second direction D2, and the length direction of the first housing 20 is parallel to the third direction D3. The width of the first housing 20 is less than its length, and the length is less than its height. This ensures that the area of ​​the air inlet and outlet can be accommodated, resulting in a larger air volume.

[0068] Understandably, unlike the centralized air outlet of related duct components, the duct component of the present invention has its first housing 20 kept relatively open in the direction perpendicular to the second direction D2, and the number of first air outlets 22 is large, greatly increasing the air outlet area.

[0069] Based on this, by cooperating with the centrifugal fan 10 and the guide component 30, the centrifugal fan 10 can have a relatively large air volume and a wide airflow coverage under low static pressure conditions.

[0070] In use, the air duct assembly can simultaneously deliver air in all directions perpendicular to the second direction D2, forming a wide, diffused airflow. This rapidly agitates and mixes a large area of ​​air, resulting in fast purification.

[0071] Static pressure refers to the pressure exerted perpendicularly on the wall of a container when the airflow is stationary or flowing at a constant speed. Static pressure differs from dynamic pressure, which is the pressure generated by the conversion of the airflow's kinetic energy during flow. The greater the kinetic energy of the airflow, the greater the dynamic pressure. The sum of static pressure and dynamic pressure is the total pressure. If the airflow is stationary, the dynamic pressure is zero, and the total pressure equals the static pressure.

[0072] The airflow is filtered by a target filter with a target resistance, meaning the duct assembly is used in conjunction with a filter of that target resistance. The target resistance can be set from 10 to 90 Pa; for example, the resistance of an electronic filter is only 10 to 40 Pa, far lower than that of a conventional HEPA filter. Thus, the target filter has low static pressure requirements, eliminating the need for a pressure boosting structure, such as a volute.

[0073] Alternatively, the air duct assembly of the present invention is provided with a flow guide 30. Specifically, the flow guide 30 is disposed within and connected to the first housing 20. The two can be fixedly connected, for example, by welding, bonding, or integrally forming the two; or they can be detachably connected.

[0074] Along the first direction D1, the guide element 30 is disposed between two adjacent centrifugal fans 10. Along the first direction D1, both sides of the guide element 30 are provided with guide concave arc surfaces 31. The concavity of the guide concave arc surface 31 is relative to the target fan 101; different guide concave arc surfaces 31 correspond to different target fans 101. In the case of three or more centrifugal fans 10, two guide concave arc surfaces 31 may correspond to the same target fan 101. Those skilled in the art can set the relevant parameters of the guide concave arc surface 31 according to actual needs, such as the radius of curvature and arc length. Preferably, the edge of the guide concave arc surface 31 is disposed at the outlet of the corresponding first air outlet 22, preferably on the inner side of the first air outlet 22.

[0075] The guide concave surface 31 is configured to guide the airflow from the target fan 101 to the adjacent fan 102 to the first air outlet 22. The target fan 101 is the centrifugal fan 10 corresponding to the guide concave surface 31 among the two centrifugal fans 10 adjacent to the guide element 30, and the adjacent fan 102 is the centrifugal fan 10 facing away from the guide concave surface 31.

[0076] Thus, the air ducts are separated by the guide element 30, making the two adjacent air ducts relatively independent. When the centrifugal fan 10 is working, air enters along the axial direction of the centrifugal fan 10, and the first housing 20 exits air in multiple directions perpendicular to the second direction D2. The air volume is large, which can quickly agitate and mix a large range of air, resulting in fast purification speed.

[0077] Meanwhile, the guide concave surface 31, unlike the volute tongue, primarily guides the airflow. The volute tongue narrows the outlet and interacts with the airflow to increase the static pressure at the outlet. Because the volute tongue is eliminated, the outlet area of ​​the first outlet 22 is equal, and the airflow does not interact with the absent volute tongue. Under the influence of the guide concave surface 31, the airflow direction and velocity are more uniform, and there are no violent eddies or whistling at the first outlet 22. The overall aerodynamic noise is lower than that of a traditional centrifugal fan with the same air volume and higher outlet velocity.

[0078] In addition, during the testing phase, the static pressure and airflow of the duct can be adjusted to find the maximum airflow at the corresponding static pressure. By comparing the maximum airflow with the target airflow, and with redundancy in both airflow and static pressure, the motor speed can be reduced, thereby reducing power consumption and achieving energy savings.

[0079] Taking a duct assembly with two centrifugal fans 10 as an example, the first housing 20 has two first air outlets 22. During operation, the motor of the centrifugal fan 10 drives the centrifugal impeller 11 to rotate at a relatively low speed, causing the airflow filtered by the target filter (resistance level) to enter through the corresponding first air inlet 21. Then, with the cooperation of the centrifugal fan 10 and the guide vane 30, the airflow is discharged from both sides of the duct assembly along the first direction D1 and from both sides of the duct assembly along the third direction D3, achieving 360-degree full-circle airflow. In this way, large air volume and low noise can be achieved with low energy consumption.

[0080] In summary, the air duct assembly of this invention, targeting the target filter with the target resistance, utilizes the cooperation of the first housing 20 and the guide element 30 to provide multiple first air outlets 22 for each centrifugal fan 10. During operation, the centrifugal fan 10 rotates, causing the airflow filtered by the target filter to enter through the first air inlet 21. With the cooperation of the centrifugal fan 10, the inner wall of the first housing 20, and the guide concave arc surface 31 of the guide element 30, the airflow is discharged from the multiple first air outlets 22, delivering air in multiple directions perpendicular to the second direction D2, forming a wide, diffused airflow. This allows for rapid agitation and mixing of a large area of ​​air, resulting in fast purification. By using the guide concave arc surface 31 instead of the volute, the air outlet area of ​​the first air outlets 22 is made uniform, preventing airflow interaction with the volute. Under the action of the guide concave arc surface 31, the airflow direction and velocity are more uniform, preventing violent eddies and whistling, resulting in low overall aerodynamic noise. In addition, during the testing phase, the static pressure and air volume of the duct are adjusted, and the motor speed is appropriately reduced to reduce power and thus achieve energy saving.

[0081] Reference Figure 6 As shown, in some embodiments of the duct assembly of the present invention, the curve segment shape of the guide concave arc surface 31 on the cross section perpendicular to the second direction D2 is set to be the same as the involute segment shape of the target fan 101.

[0082] When the centrifugal fan 10 is working, its centrifugal impeller 11 rotates, throwing the axially entering airflow radially outward. Because the centrifugal impeller 11 rotates, the airflow is also thrown out in a rotating motion, resulting in airflow rotation. The involute spiral of the centrifugal fan 10 is designed based on the trajectory of the rotating airflow; its direction of rotation is the same as the direction of rotation of the centrifugal impeller 11, and the continuous distance from the outermost point on the spiral to the corresponding center is greater.

[0083] Setting the curve segment shape of the guide concave arc surface 31 to be the same as the involute segment shape of the target fan 101 conforms to aerodynamic principles. The involute shape of the guide concave arc surface 31 can better fit the trajectory of the airflow thrown out by the centrifugal impeller 11, reducing the impact and separation of the airflow with the wall. This results in smoother airflow, a flatter and more stable pressure-flow curve, and minimized energy losses (such as eddy current losses and friction losses), thereby improving the efficiency of the centrifugal fan 10. Because the airflow is stable, severe turbulence and pressure pulsations are avoided, significantly reducing aerodynamic noise during operation. Ideally, the involute shape ensures that the static pressure acting on the first outlet 22 is uniform, which helps the centrifugal fan 10 operate stably, reduces vibration, and further reduces noise.

[0084] Reference Figure 4 , Figure 6 and Figure 7 As shown, in some embodiments of the air duct assembly of the present invention, the guide member 30 has a guide convex arc surface 32 on both sides along the first direction D1. Along the third direction D3, the guide convex arc surface 32 is disposed on one side of the guide concave arc surface 31.

[0085] On a cross section perpendicular to the second direction D2, the curve segments of the guiding convex arc surface 32 and the guiding concave arc surface 31 are designed to be centrally symmetrical about the target point, and the curve segments of the guiding convex arc surface 32 and the guiding concave arc surface 31 are tangent to each other. Specifically, on the cross section perpendicular to the second direction D2, the target point is located on the line connecting the axes of two adjacent centrifugal fans 10, preferably at the midpoint of the line connecting the centers of the two centrifugal fans 10.

[0086] In each air duct, the concave guide surface 31 primarily acts on one adjacent first air outlet 22. The number of first air outlets 22 in each air duct is not unique; each air duct includes at least two first air outlets 22 arranged opposite each other along a third direction D3. For the other air outlet, compared to making the wall of the guide element 30 flat, providing a convex guide surface 32 can further enlarge the first air outlet 22, making its outlet area larger. This can be combined with the centrifugal impeller 11 to achieve a large air volume, forming a wide, diffused airflow, rapidly agitating and mixing a large area of ​​air, achieving efficient air purification.

[0087] Furthermore, refer to Figure 8 As shown, in some embodiments of the air duct assembly of the present invention, both ends of the guide member 30 along the third direction D3 are provided with arc surfaces 33, and both surfaces of the guide member 30 along the first direction D1 are connected to the arc surfaces 33 by arc transition.

[0088] By incorporating the arc surface 33 and the arc transition, boundary separation and eddy current loss can be effectively avoided, allowing the airflow to be blown further, forming a wide, diffuse airflow that rapidly agitates and mixes a large area of ​​air, achieving highly efficient air purification. Simultaneously, it avoids sudden pressure changes and flow instability, preventing backflow and noise. Furthermore, it makes the structure more reliable, prevents stress concentration, and extends the service life of the components.

[0089] When it is necessary to make the guide 30 rotatable, the arc structure at the end of the guide 30 also facilitates the opening of the threaded hole 36 to realize the screw locking.

[0090] Reference Figure 9 As shown, in some embodiments of the air duct assembly of the present invention, a first rotating portion 34 is provided on both sides of the guide member 30 along the second direction D2. Along the third direction D3, the first rotating portion 34 is located in the central region of the guide member 30. The first housing 20 is provided with a second rotating portion 23 corresponding to the first rotating portion 34, and the first rotating portion 34 and the second rotating portion 23 are rotatably connected. In this case, the target point is set on the axis of the first rotating portion 34 or the second rotating portion 23.

[0091] Preferably, one of the first rotating part 34 and the second rotating part 23 is configured as a rotating shaft, and the other is configured as a rotating hole, with the two parts rotating in a hole-shaft fit-through configuration. Preferably, the axis corresponding to the arc surface 33 is parallel to the axis of the rotating shaft.

[0092] By providing the first rotating part 34 and the second rotating part 23, the guide member 30 can rotate relative to the first housing 20 when needed, thereby achieving fine adjustment of the minimum radial dimension D of the guide concave surface 31. Those skilled in the art can set a way to restrict the rotation of the guide member 30 according to actual needs. For example, a snap-fit ​​structure can be provided to prevent the guide member 30 from rotating when needed.

[0093] Where L is the outer diameter of the centrifugal fan 10. The minimum radial dimension D is the minimum difference between the distance H from a point on the guide concave surface 31 to the center of the corresponding target fan 101 and the outer diameter L of the centrifugal fan 10.

[0094] The ratio of the minimum radial dimension D of the guide concave surface 31 to the outer diameter L of the centrifugal fan 10 is the relative clearance ratio. Adjusting this ratio allows for adjustment of the duct static pressure. When the relative clearance ratio decreases, meaning the minimum radial dimension D decreases and the guide concave surface 31 is relatively closer to the centrifugal fan 10, the static pressure increases. Conversely, when the relative clearance ratio increases, meaning the minimum radial dimension D increases and the guide concave surface 31 is relatively farther from the centrifugal fan 10, the static pressure decreases.

[0095] For example, in Figure 9In the figure, D1 and H1, and D2 and H2 respectively, illustrate the minimum radial dimensions and corresponding distances of the guide element 30 at two different installation angles.

[0096] For air purifiers within the same series, components of the air duct assembly are often shared to facilitate experimental testing and save development time and costs. For different derivative models, filters may include additional components such as activated carbon filters and photocatalytic filters to achieve different performance levels, resulting in slight differences in resistance. To match these varying resistances, static pressure can be fine-tuned during the testing phase by rotating the air guide component 30°. Based on this, comparative experiments on noise and airflow are conducted to find the optimal installation angle, allowing for significant reductions in development cycles and material costs when switching between different derivative models.

[0097] Furthermore, refer to Figure 9 As shown, in some embodiments of the duct assembly described in this invention, the minimum radial dimension D satisfies the relationship 0.05*L≤D≤0.15*L. The minimum radial dimension D affects the relative clearance ratio, which is related to the efficiency, noise, and pressure-flow characteristics of the centrifugal fan 10. Its influence typically exhibits a U-shaped trend, with an optimal range.

[0098] In this embodiment of the invention, the minimum radial dimension D should not be too small. If the minimum radial dimension D is too small, less than 0.05*L, it will increase noise and vibration due to airflow pulsation, turbulence, and surge, and cause the pressure-flow curve to become steeper, making it more sensitive to changes in overall resistance. At the same time, the minimum radial dimension D should not be too large. If the minimum radial dimension D is too large, greater than 0.15*L, it will lead to a decrease in efficiency and pressure, and a narrowing of the high-efficiency zone, meaning the duct assembly can only achieve acceptable efficiency near a specific flow point. Setting the minimum radial dimension D between 0.05*L and 0.15*L effectively avoids these problems, balancing low noise and high efficiency.

[0099] For example, the minimum radial dimension D can be set to 0.05*L, 0.06*L, 0.07*L, 0.08*L, 0.09*L, 0.1*L, 0.11*L, 0.12*L, 0.13*L, 0.14*L, 0.15*L, etc.

[0100] Reference Figure 7 and Figure 8 As shown, in some embodiments of the air duct assembly of the present invention, limiting portions 35 are provided on both sides of the guide member 30 along the second direction D2. Along the first direction D1, the size of the guide member 30 is smaller than the size of the limiting portion 35.

[0101] To ensure efficient space utilization, the guide member 30 is typically small in the first direction D1, meaning it is relatively thin. However, when rotation is required, the strength and rigidity of a thin guide member 30 often cannot be guaranteed. By providing a limiting part 35 to the guide member 30, the cross-sectional shape of both the guide member 30 and the limiting part 35 in the section perpendicular to the third direction D3 resembles an "I" shape. This effectively ensures the strength and rigidity of the rotatable guide member 30, as well as its stability under airflow.

[0102] Furthermore, refer to Figure 7 As shown, in some embodiments of the air duct assembly of the present invention, the target size of the limiting portion 35 is set to gradually decrease along a first target direction. The first target direction is the direction from the end of the limiting portion 35 in the third target direction D3 to the center of the limiting portion 35. The target size is the size of the limiting portion 35 in a second target direction, which is perpendicular to both the first and second target directions. By setting this structure, the size of the limiting portions 35 located at both ends of the guide member 30 is maximized, thus effectively preventing the unconnected ends of the guide member 30 from swaying due to airflow and improving stability.

[0103] Continuing, further, refer to Figure 8 As shown, in some embodiments of the air duct assembly of the present invention, a flow-guiding chamfer 352 is provided on the limiting surface 351 of the limiting portion 35 near the flow guide 30 along the second direction D2. The flow-guiding chamfer 352 is provided on the edge of the limiting portion 35 and is arranged circumferentially around the limiting surface 351. By providing the flow-guiding chamfer 352, when facing the corresponding airflow, the flow-guiding chamfer 352 can be used to guide it, effectively reducing the possibility of airflow impacting the limiting portion 35 and causing vibration, noise, and other problems.

[0104] Reference Figure 10 As shown, in some embodiments of the air duct assembly of the present invention, at least one side of the guide member 30 is provided with a threaded hole 36 along the second direction D2. Along the third direction D3, the threaded hole 36 is disposed at the edge of the guide member 30. Preferably, the guide member 30 is provided with threaded holes 36 on both sides along the second direction D2, and two threaded holes 36 are provided on each side of the guide member 30 along the second direction D2, with the two threaded holes 36 respectively disposed at both ends of the guide member 30 in the third direction D3. Thus, a total of four threaded holes 36 are provided, effectively ensuring the high stability of the guide member 30.

[0105] The first housing 20 is provided with a limiting strip hole 24 corresponding to the threaded hole 36. A threaded component 51 is provided in the limiting strip hole 24. The threaded component 51 is movable relative to the limiting strip hole 24 along the extension direction of the limiting strip hole 24. The threaded component 51 is threadedly connected to the threaded hole 36. Preferably, the threaded component 51 is a height limiting screw.

[0106] When it is necessary to rotate the guide component 30, simply loosen the threaded part 51 to adjust the rotation. After adjustment, if experimental testing is required, tighten the threaded part 51 to lock the guide component 30 and prevent it from rotating arbitrarily. By setting up this structure, the guide component 30 can be rotated or locked very conveniently, thereby improving the efficiency of experimental testing.

[0107] Furthermore, refer to Figure 2 , Figure 11 and Figure 12 As shown, in some embodiments of the air duct assembly of the present invention, a first auxiliary member 52 and a second auxiliary member 53 are provided on the side of the first housing 20 away from the guide member 30 along the second direction D2 to assist in the rotational adjustment of the guide member 30.

[0108] The first auxiliary component 52 is connected to the first housing 20. Those skilled in the art can set the connection method between the two according to actual needs, such as a fixed connection or an integral molding setting, or it can be set as a detachable connection.

[0109] The first auxiliary component 52 is provided with a guide groove 521. As can be understood, the guide groove 521 is an arc-shaped guide groove with the two rotating parts as the center and the radius of the distance from the end of the guide component 30 in the third direction D3 to the two rotating parts, so as to provide guidance for the rotation of the guide component 30 and improve the structural stability.

[0110] The guide groove 521 has a plurality of first meshing teeth 522 on its groove wall surface, and the plurality of first meshing teeth 522 are arranged sequentially along the extension direction of the guide groove 521. Preferably, the cross-section of the first meshing teeth 522 is set as semi-circular.

[0111] The second auxiliary component 53 connects to the threaded component 51. Preferably, the second auxiliary component 53 has a through hole, and the threaded component 51 passes through the through hole. The second auxiliary component 53 is movable relative to the guide groove 521 along the extension direction of the guide groove 521. Preferably, the two are clearance-fitted. The second auxiliary component 53 is provided with a second meshing tooth 5321, which engages with the first meshing tooth 522.

[0112] Thus, by cooperating with the first auxiliary component 52 and the second auxiliary component 53, the guide component 30 can be precisely adjusted to a preset angle.

[0113] Furthermore, refer to Figure 12 and Figure 13As shown, in some embodiments of the air duct assembly of the present invention, the second auxiliary component 53 includes a connected auxiliary body 531 and a spring arm 532. Specifically, the spring arm 532 is disposed between the auxiliary body 531 and the first meshing tooth 522, with one end of the spring arm 532 connected to the auxiliary body 531. The second meshing tooth 5321 is disposed on the spring arm 532. Preferably, the auxiliary body 531 and the spring arm 532 are integrally formed. Thus, when rotating and adjusting the guide member 30, the elastic deformation of the spring arm 532 can be used to quickly adjust the first meshing tooth 522 that is engaged with the second meshing tooth 5321, thereby achieving precise adjustment of the angle of the guide member 30.

[0114] Continuing, further, refer to Figure 12 As shown, in some embodiments of the air duct assembly of the present invention, the groove wall of the guide groove 521 is provided with a notch 523. By providing the notch 523, the contact area between the first auxiliary member 52 and the second auxiliary member 53 can be reduced, friction can be reduced, so as to quickly adjust the installation angle of the guide member 30.

[0115] Reference Figure 13 As shown, in some embodiments of the air duct assembly of the present invention, along the second direction D2, the second auxiliary member 53 is provided with a plurality of sliding contact ribs 5311 on the side near the first housing 20. The extending direction of the sliding contact ribs 5311 is the same as the extending direction of the guide groove 521, and the sliding contact ribs 5311 are slidably connected to the first housing 20.

[0116] By providing sliding contact ribs 5311, the contact area between the auxiliary body 531 and the first housing 20 can be effectively reduced, thus reducing friction and facilitating quick adjustment of the installation angle of the guide member 30. Preferably, two sliding contact ribs 5311 are provided, each with a width of 0.5 to 1 mm. The sliding contact ribs 5311 can be used in conjunction with the notch 523.

[0117] In some embodiments of the air duct assembly described in this invention, the first auxiliary component 52 and the second auxiliary component 53 are both made of polyoxymethylene (POM). POM has self-lubricating properties, and the first auxiliary component 52 and the second auxiliary component 53 made of POM have a low coefficient of friction, so as to quickly adjust the installation angle of the guide component 30.

[0118] Reference Figure 11As shown, in some embodiments of the air duct assembly of the present invention, the outer surface of the first housing 20 along the second direction D2 is provided with a reinforcing rib grid 26, which is formed by a grid of reinforcing ribs to increase the structural strength of the first housing 20. A first auxiliary member 52 is disposed within the reinforcing rib grid 26, with its sidewall abutting against the inner wall of the reinforcing rib grid 26. The first auxiliary member 52 is detachably connected to the first housing 20. This structure facilitates the replacement of first auxiliary members 52 of different specifications, enabling precise adjustment of different preset angles.

[0119] Taking a dual centrifugal fan 10 as an example, it typically uses a single signal line to drive two motors, both rotating at the same speed. This can easily lead to resonance noise at the same frequency. Experimental data shows that the noise generated by resonance can range from 1 to 3 dB(A), i.e., the frequency-weighted decibel value. Simultaneously, it can also cause vibration of the casing and other electronically controlled components, affecting overall reliability and the user experience.

[0120] To address the aforementioned issues, in some embodiments of the duct assembly described in this invention, the operating frequency of each centrifugal fan 10 is set to be different at each moment.

[0121] Taking the dual centrifugal fan 10 as an example, in this embodiment of the invention, the two centrifugal fans 10 are controlled separately to stagger the frequency and duty cycle of the corresponding motors, so that the frequency and duty cycle of the two are intersected.

[0122] At a given time t, motor A operates at a frequency of 21 kHz, a duty cycle of 75%, and a speed of 1250 rpm; motor B operates at a frequency of 22.5 kHz, a duty cycle of 72%, and a speed of 1230 rpm. At a given time t+1, the parameters of A and B are reversed, and this process is repeated continuously.

[0123] Alternatively, the operating parameters of motor A can be gradually increased while the parameters of motor B can be gradually decreased, and this process can be repeated continuously.

[0124] For example, at a certain time t, motor A operates at a frequency of 21 kHz with a 75% duty cycle; motor B operates at a frequency of 22.5 kHz with a 72% duty cycle. At a certain time t+1, motor A operates at a frequency of 21.5 kHz with a 74% duty cycle; motor B operates at a frequency of 22 kHz with a 73% duty cycle. At a certain time t+2, motor A operates at a frequency of 22 kHz with a 73% duty cycle; motor B operates at a frequency of 21.5 kHz with a 74% duty cycle. At a certain time t+3, motor A operates at a frequency of 22.5 kHz with a 72% duty cycle; motor B operates at a frequency of 21 kHz with a 75% duty cycle. At a certain time t+4, motor A operates at a frequency of 22 kHz with a 73% duty cycle; motor B operates at a frequency of 21.5 kHz with a 74% duty cycle. At a certain time t+5, motor A operates at a frequency of 21.5 kHz with a duty cycle of 74%; motor B operates at a frequency of 22 kHz with a duty cycle of 73%. At a certain time t+6, motor A operates at a frequency of 21 kHz with a duty cycle of 75%; motor B operates at a frequency of 22.5 kHz with a duty cycle of 72%.

[0125] This effectively smooths out the noise of individual motors, averaging the noise across different frequencies and effectively suppressing howling, thus reducing overall machine noise. It also effectively reduces the negative effects of motor resonance at the same frequency. Furthermore, it effectively addresses electromagnetic radiation and electromagnetic interference (EMC) of the entire machine.

[0126] Reference Figure 1 and Figure 2 As shown, in some embodiments of the air duct assembly of the present invention, centrifugal blades 111 are provided on both sides of the centrifugal impeller 11 along the second direction D2, and the blades of the centrifugal blades 111 on both sides of the centrifugal impeller 11 have the same bending direction.

[0127] The first housing 20 includes two detachably connected housing sections 201, arranged opposite to each other along the second direction D2. Preferably, the two sections are locked together by screws. One of the housing sections 201 is provided with a fan mounting section for mounting a centrifugal fan 10.

[0128] The shell body 201 is provided with a first air inlet 21, and a first air inlet grille 25 is provided at the first air inlet 21. Preferably, the first air inlet grille 25 is arranged radially to cut the airflow and reduce noise.

[0129] Along the first direction D1, first air outlet half-ports 221 are provided on both sides of the shell body 201, and the two corresponding first air outlet half-ports 221 are combined to form a first air outlet 22. Along the third direction D3, second air outlet half-ports 222 are provided on both sides of the shell body 201, and the two corresponding second air outlet half-ports 222 are combined to form a first air outlet 22. In this way, the airflow purified by the target filter is discharged.

[0130] On the other hand, refer to Figure 14 and Figure 15 As shown, this embodiment of the invention also provides an air purifier, including a target filter and the air duct assembly described in any of the above embodiments. Since the air purifier of this invention includes the air duct assembly described in the above embodiments, it also possesses all the beneficial effects described herein, and will not be repeated here.

[0131] Along the second direction D2, at least a portion of the target filter is disposed on the air inlet side of the first air inlet 21, and the filtration resistance of the target filter is set to the target resistance, for example, 10 to 90 Pa.

[0132] For example, the target filter can be set to a HEPA filter or an electronic filter.

[0133] Reference Figure 14 and Figure 15 As shown, in some embodiments of the air purifier of the present invention, a second housing 60 is further included. The second housing 60 is disposed outside the target filter and the air duct assembly, and is connected to the target filter and the air duct assembly. Preferably, the components are detachably connected.

[0134] The second housing 60 is provided with a second air inlet 61 corresponding to the first air inlet 21 and a second air outlet 62 corresponding to the first air outlet 22. A second air inlet grille 63 is provided at the second air inlet 61, and an air outlet grille 64 is provided at the second air outlet 62. In this way, the airflow passes through the second air inlet 61 and the first air inlet 21 in sequence, and is discharged through the first air outlet 22 and the second air outlet 62 under the action of the centrifugal fan 10.

[0135] Taking the first rectangular shell 20 as an example, the corresponding second shell 60 is also designed as a rectangular shell structure. Air enters through two faces corresponding to the height and length of the rectangular shell, and exits through the remaining faces. This achieves a large air outlet area and a large air volume. The air purifier can deliver air in multiple directions perpendicular to the second direction D2, forming a wide, diffused airflow. This allows for rapid agitation and mixing of a large area of ​​air, resulting in fast purification.

[0136] Preferably, the second housing 60 includes a first sub-housing 601, a second sub-housing 602, a third sub-housing 603, and a fourth sub-housing 604. Two first sub-housings 601 are provided, arranged opposite each other along a second direction D2. Each of the two first sub-housings 601 is provided with a second air inlet 61, and a second air inlet grille 63 is detachably provided. Simultaneously, each first sub-housing 601 is provided with a receiving cavity, within which a portion of the target filter is detachably disposed for filtration.

[0137] There are two second shells 602, which are arranged opposite each other along the third direction D3. Each second shell 602 is integrally provided with an air outlet grille 64 to divide the airflow and reduce noise.

[0138] The third shell 603 and the fourth shell 604 are arranged opposite each other along the first direction D1. Both the third shell 603 and the fourth shell 604 are integrally provided with an air outlet grille 64. The fourth shell 604 is also provided with casters so that users can adjust the position of the air purifier according to their needs.

[0139] Reference Figure 14 and Figure 15 As shown, in some embodiments of the air purifier of the present invention, the target filter is configured as an electronic filter, and the air purifier is configured as a high-voltage ion air purifier. The electronic filter includes a high-voltage electric field element 41 and an ion generator 42.

[0140] A high-voltage electric field element 41 is disposed on the air inlet side of the first air inlet 21 and is used to adsorb charged pollutants. For reference, the voltage difference between the positive and negative electrodes of the high-voltage electric field element 41 can reach 20 to 30 kV. An ion generator 42 is disposed on the first air outlet 22 and is used to generate charged ions, which are used to charge pollutants.

[0141] During operation, the airflow efficiently and evenly transports charged ions to the surrounding space, causing pollutants to become charged. Under the action of the centrifugal fan 10, the pollutants are drawn into the air purifier and adsorbed by the high-voltage electric field component 41, thus achieving purification.

[0142] Preferably, multiple sets of ion generators 42 are provided, each disposed at a different air outlet. In this embodiment of the invention, two high-voltage electric field elements 41 are preferably provided, each disposed on the air inlet side of the two first air inlets 21.

[0143] On the other hand, refer to Figure 16 As shown, this embodiment of the invention also provides a duct component control method, applied to the duct component as described in any of the above embodiments. Specifically, the duct component control method includes the following steps:

[0144] First, in response to a work command, the centrifugal fan 10 is controlled to rotate. Multiple centrifugal fans 10 are arranged side-by-side along a first direction D1, with intervals between them. The axial direction of each centrifugal fan 10 is parallel to a second direction D2, which is perpendicular to the first direction D1. A first housing 20 is provided outside each centrifugal fan 10, connecting it to the fan. The first housing 20 has multiple air ducts, each corresponding to a centrifugal fan 10. Each air duct includes a connected first air inlet 21 and multiple first air outlets 22. Along the second direction D2, the first air inlet 21 is located on one side of the air inlet surface of the centrifugal fan 10. Along a direction perpendicular to the second direction D2, multiple first air outlets 22 are located on the outer periphery of the centrifugal fan 10. A guide member 30 is provided inside the first housing 20, connecting it to the housing. Along the first direction D1, the guide member 30 is positioned between adjacent centrifugal fans 10 to separate the air ducts. Along the first direction D1, both sides of the flow guide 30 are provided with flow guide concave arc surfaces 31.

[0145] Secondly, the airflow filtered by the target filter with target resistance enters the air duct through the first air inlet 21.

[0146] Finally, the target fan 101 guides the airflow of the adjacent fan 102 to the first air outlet 22 via the corresponding guide concave arc surface 31. The target fan 101 is the centrifugal fan 10 corresponding to the guide concave arc surface 31, and the adjacent fan 102 is the centrifugal fan 10 facing away from the guide concave arc surface 31.

[0147] In some embodiments of the air duct component control method of the present invention, before controlling the centrifugal fan 10 to rotate in response to a working command, the method further includes the following steps:

[0148] First, in response to the first test command, the centrifugal fan 10 is controlled to rotate at the first target speed.

[0149] Secondly, the flow guide 30 is controlled to rotate relative to the first housing 20 to determine the maximum airflow of the air duct assembly when the flow guide 30 is at different rotation angles.

[0150] Finally, based on the target air volume, the rotation angle of the guide vane 30, and the corresponding maximum air volume, the first speed range of the centrifugal fan 10 during operation is determined.

[0151] For low-resistance target filters, the static pressure requirements for the duct components are not high. During the testing phase, experimental tests can be conducted to identify redundancy in overall unit resistance and airflow, avoiding wasted motor power. With redundancy in airflow and static pressure, the motor speed can be reduced to effectively lower noise and power consumption.

[0152] In some embodiments of the air duct component control method of the present invention, before controlling the centrifugal fan 10 to rotate in response to a working command, the method further includes the following steps:

[0153] First, in response to the second test command, the centrifugal fan 10 is controlled to rotate at the second target speed.

[0154] Secondly, obtain the airflow of the duct components and the filtration efficiency of the corresponding target filter.

[0155] Finally, based on the air volume and filtration efficiency, the second speed range of the centrifugal fan 10 during operation is determined.

[0156] It's important to note that Clean Air Delivery Rate (CADR) = Airflow * Filtration Efficiency. Understandably, if the airflow is too high, the inertial force of pollutants makes it difficult for them to be captured by electrostatic attraction. This means that excessive airflow may reduce filtration efficiency and not necessarily increase CADR. By balancing the airflow of the duct components and the filtration efficiency, the CADR of the air purifier can be maximized.

[0157] The second speed range can also be combined with the first speed range, taking the intersection of the two to determine the final range, so as to balance low energy consumption, low noise and large air volume, and ensure high filtration efficiency.

[0158] In some embodiments, the air duct component control method of the present invention controls the centrifugal fan 10 to rotate in response to a working command, including the step of controlling the working frequency of each centrifugal fan 10 to be different at each moment.

[0159] For example, taking the dual centrifugal fan 10 as an example, the frequencies and duty cycles of the corresponding motors can be staggered. For instance, at a certain time t, motor A operates at a frequency of 21 kHz with a 75% duty cycle; motor B operates at a frequency of 22.5 kHz with a 72% duty cycle. At a certain time t+1, the parameters of A and B can be directly reversed, and this switching can be repeated continuously. Alternatively, the operating parameters of motor A can be gradually increased, while the parameters of motor B can be gradually decreased, and this switching can be repeated continuously.

[0160] Working principle:

[0161] During the R&D and testing phase of air purifiers, different derivative models within the same series have slightly different filter resistance levels, resulting in varying static pressure requirements for the duct components. In this case, operators can fine-tune the installation angle of the guide member 30 relative to the first housing 20 using the threaded part 51, the first auxiliary part 52, and the second auxiliary part 53. As the guide member 30 rotates and its installation angle changes, the minimum radial dimension D of the guide concave arc surface 31 of the guide member 30 also changes, thereby altering the duct static pressure.

[0162] Specifically, when fine-tuning the angle of the guide member 30, first loosen the threaded part 51, then control the guide member 30 and the second auxiliary part 53 to rotate around the corresponding rotating part. When the second auxiliary part 53 is under force and moves along the guide groove 521, its elastic arm 532 undergoes elastic deformation relative to the auxiliary body 531 and then recovers, thereby adjusting the first meshing tooth 522 that is engaged with the second meshing tooth 5321, thus achieving precise adjustment of the angle of the guide member 30. After rotating the guide member 30 to the required angle, tighten the threaded part 51.

[0163] After the angle adjustment is completed, the corresponding filter is assembled with the air duct assembly after the static pressure adjustment, and sent to the laboratory for experimental testing to ensure that the motor speed of the centrifugal fan 10 is appropriate, taking into account low noise, low energy consumption, large air volume and high filtration efficiency.

[0164] When the air purifier is working, the motor of the centrifugal fan 10 rotates, driving the centrifugal impeller 11 and centrifugal blades 111 to rotate. This causes external airflow to flow through the corresponding air inlets and filters, and with the cooperation of the centrifugal fan 10, the inner wall of the first housing 20, and the guide concave arc surface 31 of the guide component 30, the air is discharged from multiple first air outlets 22, delivering air in multiple directions perpendicular to the second direction D2, forming a wide and diffused airflow. In this way, a large area of ​​air can be quickly agitated and mixed, resulting in a fast purification speed.

[0165] Because the air guide 30 replaces the volute tongue, and is combined with the multi-outlet structure of the corresponding housing, the air purifier has a larger air outlet area, and the airflow does not interact with the volute tongue. Under the action of the concave and convex curved surfaces 31 and 32, the airflow direction and speed are more uniform, preventing violent eddies and whistling, resulting in low overall aerodynamic noise. Furthermore, after adjustments, the motor speed of the centrifugal fan 10 can be appropriately reduced, and the operating frequency of each centrifugal fan 10 is different at any given time. This results in low energy consumption and further noise reduction.

[0166] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0167] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0168] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An air duct assembly, characterized by, The wind channel assembly comprises: a plurality of centrifugal fans arranged side by side; the plurality of centrifugal fans are sequentially and spaced apart along a first direction; an axial direction of the centrifugal fan is parallel to a second direction, and the second direction is perpendicular to the first direction; a first shell arranged outside the centrifugal fan and connected to the centrifugal fan; the first shell is provided with a plurality of air ducts corresponding to the centrifugal fans; the air duct comprises a first air inlet and a plurality of first air outlets; along the second direction, the first air inlet is arranged on one side of the air inlet surface of the centrifugal fan; the first air inlet is used to introduce air flow filtered by a target filter with a target resistance into the air duct; and along a direction perpendicular to the second direction, a plurality of first air outlets are arranged on the outer periphery of the centrifugal fan; and a flow guide arranged in the first shell and connected to the first shell; along the first direction, the flow guide is arranged between two adjacent centrifugal fans to separate the air ducts; along the first direction, the flow guide is provided with a flow guide concave arc surface on both sides of the flow guide; the flow guide concave arc surface is configured to guide the air flow of a target fan to the first air outlet; wherein the target fan is the centrifugal fan corresponding to the flow guide concave arc surface, and the adjacent fan is the centrifugal fan away from the flow guide concave arc surface; wherein, along the second direction, the flow guide is provided with a first rotating part on both sides of the flow guide; along a third direction, the first rotating part is arranged in a middle region of the flow guide; the first shell is provided with a second rotating part corresponding to the first rotating part, and the first rotating part and the second rotating part are rotationally connected; the third direction is perpendicular to the first direction and the second direction, respectively; the flow guide is configured to adjust the minimum radial dimension D of the flow guide concave arc surface by rotation, wherein the minimum radial dimension D satisfies the relationship 0.05*L≤D≤0.15*L; wherein L is the outer diameter dimension of the centrifugal fan; the minimum radial dimension is the minimum value of the difference between the distance H from a point on the flow guide concave arc surface to the center of the corresponding target fan and the outer diameter dimension L of the centrifugal fan.

2. The wind channel assembly of claim 1, wherein: in a cross section perpendicular to the second direction, the curve segment shape of the flow guide concave arc surface is arranged to be the same as the involute segment shape of the target fan.

3. The wind channel assembly of claim 2, wherein: each air duct comprises at least two first air outlets arranged opposite along the third direction. Along the first direction, both sides of the flow guide are provided with a flow guide convex arc surface; along the third direction, the flow guide convex arc surface is provided on one side of the flow guide concave arc surface; on the cross section perpendicular to the second direction, the curve segment shape of the flow guide convex arc surface and the curve segment shape of the flow guide concave arc surface are provided as central symmetry about a target point, and the curve segment of the flow guide convex arc surface is tangent to the curve segment of the flow guide concave arc surface; wherein, on the cross section perpendicular to the second direction, the target point is provided on the axis center line of the adjacent two centrifugal fans.

4. The air duct assembly of claim 1, wherein: Along the third direction, both ends of the flow guide are provided with a circular arc surface, and both surfaces of the flow guide along the first direction are connected to the circular arc surface through a circular arc transition.

5. The air duct assembly of claim 1, wherein: Along the second direction, both sides of the flow guide are provided with a limiting part; along the first direction, the size of the flow guide is smaller than the size of the limiting part.

6. The air duct assembly of claim 5, wherein: The target size of the limiting part is gradually reduced along a first target direction; wherein, the first target direction is the direction in which the end of the limiting part in the third direction points to the center of the limiting part; the target size is the size of the limiting part in the second target direction, which is perpendicular to the first target direction and the second direction respectively.

7. The air duct assembly of claim 5, wherein: Along the second direction, a flow guide chamfer is provided on the limiting surface of the limiting part close to one side of the flow guide; the flow guide chamfer is provided on the edge of the limiting part, and the flow guide chamfer is provided around the circumferential direction of the limiting surface.

8. The air duct assembly of claim 1, wherein: Along the second direction, at least one side of the flow guide is provided with a threaded hole; along the third direction, the threaded hole is provided on the edge of the flow guide; The first shell is provided with a limiting strip-shaped hole corresponding to the threaded hole, a threaded part is provided in the limiting strip-shaped hole, the threaded part is movable along the extension direction of the limiting strip-shaped hole relative to the limiting strip-shaped hole, and the threaded part is threadedly connected with the threaded hole.

9. The air duct assembly of claim 8, wherein: Along the second direction, one side of the first shell away from the flow guide is provided with a first auxiliary part and a second auxiliary part; The first auxiliary part is connected to the first shell, the first auxiliary part is provided with a guide groove, the groove wall surface of the guide groove is provided with a plurality of first engagement teeth, and the plurality of first engagement teeth are sequentially provided along the extension direction of the guide groove; The second auxiliary part is connected to the threaded part, the second auxiliary part is movable along the extension direction of the guide groove relative to the guide groove, the second auxiliary part is provided with a second engagement tooth, and the second engagement tooth is connected with the first engagement tooth through clamping.

10. The air duct assembly of claim 9, wherein: The second auxiliary member comprises an auxiliary body and an elastic arm connected to the auxiliary body, the elastic arm is arranged between the auxiliary body and the first engaging tooth, and the second engaging tooth is arranged on the elastic arm.

11. The air duct assembly of claim 9, wherein: The slot wall surface of the guide slot is provided with an opening part; Or / and, Along the second direction, the second auxiliary member is provided with a plurality of sliding contact ribs on the side close to the first shell, the extension direction of the sliding contact ribs is the same as the extension direction of the guide slot, and the sliding contact ribs are in sliding connection with the first shell.

12. The air duct assembly of claim 9, wherein: The outer surface of the first shell along the second direction is provided with a reinforcing rib lattice; The first auxiliary member is arranged in the reinforcing rib lattice, the side wall surface of the first auxiliary member is in abutment with the inner wall surface of the reinforcing rib lattice, and the first auxiliary member is in detachable connection with the first shell.

13. The air duct assembly of claim 1, wherein: The working frequency of each centrifugal fan at each moment is different.

14. The air duct assembly of claim 1, wherein: The centrifugal fan comprises a centrifugal impeller, along the second direction, centrifugal blades are arranged on both sides of the centrifugal impeller, and the blade bending directions of the centrifugal blades on both sides of the centrifugal impeller are the same; The first shell comprises two shell parts in detachable connection, along the second direction, the two shell parts are arranged oppositely; The shell part is provided with the first air inlet, and the first air inlet is provided with a first air inlet grille; Along the first direction, first air outlet half openings are arranged on both sides of the shell part, and correspondingly, the two first air outlet half openings are spliced to form the first air outlet; along the third direction, second air outlet half openings are arranged on both sides of the shell part, and correspondingly, the two second air outlet half openings are spliced to form the first air outlet.

15. An air cleaner characterized by comprising: The air duct assembly comprises a target filter and an air duct assembly as claimed in any one of claims 1 to 14; along the second direction, at least part of the target filter is arranged on the air inlet side of the first air inlet, and the filtering resistance of the target filter is set as the target resistance.

16. The air cleaner of claim 15, wherein, Further comprising: A second shell arranged outside the target filter and the air duct assembly and connected to the target filter and the air duct assembly; the second shell is provided with a second air inlet corresponding to the first air inlet and a second air outlet corresponding to the first air outlet; the second air inlet is provided with a second air inlet grille, and the second air outlet is provided with an air outlet grille.

17. The air purifier of claim 15, wherein: The target filter is set as an electronic filter, and the electronic filter comprises a high-voltage electric field piece and an ion generating piece; The high-voltage electric field piece is arranged on the air inlet side of the first air inlet and is used for adsorbing charged pollutants; The ion generating piece is arranged on the first air outlet and is used for generating charged ions, and the charged ions are used for charging the pollutants.

18. A method of controlling a wind tunnel assembly as claimed in any one of claims 1 to 14, wherein, The method comprises the steps of: In response to the working instruction, the centrifugal fan is controlled to rotate; wherein, a plurality of the centrifugal fans are arranged side by side, and the plurality of the centrifugal fans are arranged in sequence and at intervals along a first direction; the axial direction of the centrifugal fan is parallel to a second direction, and the second direction is perpendicular to the first direction; a first shell is arranged outside the centrifugal fan, the first shell is connected to the centrifugal fan, the first shell is provided with a plurality of air ducts, and the air ducts correspond to the centrifugal fans one by one; the air ducts comprise a first air inlet and a plurality of first air outlets which are communicated, the first air inlet is arranged on one side of the air inlet surface of the centrifugal fan along the second direction; a plurality of the first air outlets are arranged on the outer periphery of the centrifugal fan along the direction perpendicular to the second direction; a flow guide member is arranged in the first shell, and the flow guide member is connected to the first shell; the flow guide member is arranged between adjacent two centrifugal fans along the first direction to separate the air ducts; a flow guide concave arc surface is arranged on both sides of the flow guide member along the first direction; The airflow filtered by the target filter passing through the target resistance enters the air duct from the first air inlet; The airflow of the target fan to the adjacent fan is guided to the first air outlet by the corresponding flow guide concave arc surface; wherein, the target fan is the centrifugal fan corresponding to the flow guide concave arc surface, and the adjacent fan is the centrifugal fan away from the flow guide concave arc surface.

19. The air duct assembly control method of claim 18, wherein, Before the centrifugal fan is controlled to rotate in response to the working instruction, the method further comprises the steps of: In response to a first test instruction, the centrifugal fan is controlled to rotate at a first target rotating speed; The flow guide member is controlled to rotate relative to the first shell to determine the maximum air volume of the air duct assembly when the flow guide member is at different rotating angles; According to the target air volume, the rotating angle of the flow guide member and the corresponding maximum air volume, the first rotating speed range of the centrifugal fan during work is determined.

20. The air duct assembly control method of claim 18, wherein, Before the centrifugal fan is controlled to rotate in response to the working instruction, the method further comprises the steps of: In response to a second test instruction, the centrifugal fan is controlled to rotate at a second target rotating speed; The air volume of the air duct assembly and the filtering efficiency of the corresponding target filter are obtained; According to the air volume and the filtering efficiency, the second rotating speed range of the centrifugal fan during work is determined.

21. The air duct assembly control method of claim 18, wherein, In response to the working instruction, the centrifugal fan is controlled to rotate, comprising the steps of: The working frequency of each centrifugal fan at each moment is controlled to be different.

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