Air treatment device

Abstract

The utility model discloses an air treatment device which comprises a mounting plate and an air guide coaming, and the mounting plate is provided with a mounting part used for mounting a motor; the air guide coaming comprises an arc plate, a first air guide plate and a second air guide plate which are connected with one another, the arc plate is arranged on the mounting plate by taking the mounting part as a surrounding center, the first air guide plate is connected with one end of the arc plate, the second air guide plate is connected with the other end of the arc plate, and an air guide channel is formed between the first air guide plate and the second air guide plate; in the air guiding direction of the air guiding channel, the second air guiding plate is arranged in the mode of being far away from the first air guiding plate in an extending mode, an arc-shaped air guiding part is arranged between the arc plate and the second air guiding plate, and the outer radius of the air guiding part is arranged between 14 mm and 20 mm. And the size of the air guide part is set to be proper, so that large noise is prevented from being generated when the air flow passes through the air guide part.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of home appliances, especially to an air treatment device. BACKGROUND

[0002] In the related art, the front inclined centrifugal fan on the market generally has the problem of high-frequency whistling noise, for example, the air guide channel of the centrifugal fan is often set unreasonably, which easily causes large noise, especially the sound intensity easily reaches 48 DB or above. When applied, the noise is relatively large, which easily causes discomfort to the user and even seriously affects the sleep quality of the user. SUMMARY

[0003] The utility model aims at at least solving one of the technical problems existing in the prior art. To this end, the utility model provides an air treatment device and an air treatment device, which can effectively reduce the noise generated when airflow enters the air guide channel.

[0004] In a first aspect, an air treatment device is provided, comprising:

[0005] A mounting plate is provided with a mounting portion for mounting an impeller;

[0006] An air guide coaming includes a circular arc plate, a first air guide plate and a second air guide plate connected together, the circular arc plate is arranged at the mounting plate and located at the side of the impeller, the first air guide plate is connected to one end of the circular arc plate, the second air guide plate is connected to the other end of the circular arc plate, and an air guide channel is formed between the first air guide plate and the second air guide plate;

[0007] The second air guide plate is arranged away from the first air guide plate, an arc-shaped air guide portion is arranged between the circular arc plate and the second air guide plate, and the outer arc surface radius of the air guide portion is arranged between 14 mm and 20 mm.

[0008] According to some embodiments of the utility model, the outer radius of the air guide portion is arranged at 16 mm.

[0009] According to some embodiments of the utility model, a first parameter line is defined as a line from at least a part of the outer arc surface of the air guide portion to the center point of the impeller, a second parameter line is defined as a line passing through the center point of the circular arc plate and upward relative to the air treatment device, and the included angle between the first parameter line and the second parameter line is arranged between 5 degrees and 15 degrees.

[0010] According to some embodiments of the utility model, the air guide portion has a guide arc surface facing the air guide channel, and the first parameter line is tangent to the guide arc surface.

[0011] According to some embodiments of the utility model, the impeller is a centrifugal impeller, the centrifugal impeller includes a circular end cover and a plurality of centrifugal fan blades, the plurality of centrifugal fan blades are sequentially arranged around the circular end cover, and an air outlet channel is formed between adjacent centrifugal fan blades, wherein, along the radial direction of the circular end cover, the centrifugal fan blades are arranged in an arc shape.

[0012] According to some embodiments of the utility model, one end of the inner arc surface of the centrifugal blade close to the connecting part is an air inlet end, a tangent line of the air inlet end is defined as a third parameter line, a line passing through the air inlet end and the center point of the circular end cover is defined as a fourth parameter line, and the included angle between the third parameter line and the fourth parameter line is set to be between 0 degrees and 10 degrees.

[0013] According to some embodiments of the utility model, the included angle between the third parameter line and the fourth parameter line is set to be between 3 degrees and 8 degrees.

[0014] According to some embodiments of the utility model, one end of the inner arc surface of the centrifugal blade away from the connecting part is an air outlet end, a tangent line of the air outlet end is defined as a fifth parameter line, a line passing through the air outlet end and the center point of the circular end cover is defined as a sixth parameter line, and the included angle between the fifth parameter line and the sixth parameter line is set to be between 110 degrees and 115 degrees.

[0015] According to some embodiments of the utility model, the number of the centrifugal fan blades is set to be between 48 and 55, and the inner diameter of the centrifugal fan blades is set to be between 27 mm and 33 mm.

[0016] According to some embodiments of the utility model, a wind guide inclined surface or a wind guide arc surface is arranged between the end of the centrifugal fan blade away from the connecting part and the outer arc surface of the centrifugal fan blade, and the circular end cover is provided with an opening arranged around the connecting part.

[0017] From the above technical scheme can be seen, the application embodiment has the following advantages: air treatment device in the application, the motor is loaded on the installation part, the centrifugal impeller is loaded on the inner side of the air guide fence, and is connected with the driving shaft of the motor. The motor drives the centrifugal impeller to rotate circumferentially, and the external air flows into the inner side of the circular arc plate from the air inlet. The airflow flows into the air guide channel under the action of the centrifugal impeller. Among them, along the air guide direction of the air guide channel, the second air guide plate is extended away from the first air guide plate, so that the airflow diffuses under the guidance of the second air guide plate after entering the air guide channel. Moreover, the circular arc plate and the second air guide plate are provided with a circular arc-shaped air guide part, and the inner radius of the air guide part is set to be between 14mm and 20mm. Through testing, the size of the air guide part is appropriate, that is, the size of the air guide part is not too large or too small, so that the airflow can smoothly enter the air guide channel and diffuse along the extension direction of the second air guide plate, thereby reducing the obvious noise generated by the airflow when passing through the air guide part. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a whole structure schematic view of the fan assembly of the utility model embodiment;

[0019] Figure 2 It is an explosion structure schematic view of the fan assembly of the utility model embodiment;

[0020] Figure 3 It is a front view of the fan assembly of the utility model embodiment;

[0021] Figure 4 It is a structure schematic view of the centrifugal impeller of the utility model embodiment;

[0022] Figure 5 It is a whole structure schematic view of the air treatment device of the utility model embodiment;

[0023] Figure 6 It is a noise state schematic view of the improved air treatment device;

[0024] Figure 7 It is a noise state schematic view of the unimproved air treatment device.

[0025] Among them, the meaning of the reference signs is as follows:

[0026] 100, air treatment device; 110, mounting plate; 111, air inlet; 112, mounting portion; 120, air guide fence; 121, first air guide plate; 122, second air guide plate; 123, arc plate; 124, air guide channel; 125, air guide portion; 1251, arc guide surface; 140, first parameter line; 150, second parameter line; 200, motor; 300, centrifugal impeller; 310, circular end cover; 311, opening; 312, connecting portion; 320, centrifugal fan blade; 321, air inlet end; 322, air outlet end; 323, air guide arc surface; 330, third parameter line; 340, fourth parameter line; 350, fifth parameter line; 360, sixth parameter line; 370, annular frame. DETAILED DESCRIPTION

[0027] Embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0028] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, up, down, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation of the present application.

[0029] In the description of the present application, the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than, etc. is not included in the number, above, below, etc. is included in the number. If it is described as first, second, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0030] In the description of the present application, unless otherwise explicitly limited, the words such as setting, mounting, connecting, etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application according to the specific content of the technical scheme.

[0031] In the description of the present utility model, the description of the reference terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the present utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0032] The present utility model will be further described in detail below in combination with the drawings.

[0033] Please refer to Figures 1 to 3 The air treatment device 100 provided by the embodiment of the present utility model comprises a mounting plate 110 and a wind guide fence 120. The mounting plate 110 is provided with a mounting portion 112 for mounting an impeller. More specifically, the mounting portion 112 is used for mounting a motor 200 corresponding to the impeller. The mounting plate 110 is provided with an air inlet 111 around the mounting portion 112. The wind guide fence 120 comprises a circular arc plate 123, a first wind guide plate 121 and a second wind guide plate 122 connected with each other. The circular arc plate 123 is arranged on the mounting plate 110 with the mounting portion 112 as the center. That is, the circular arc plate 123 is arranged on the circumferential side of the impeller. The first wind guide plate 121 is connected with one end of the circular arc plate 123, and the second wind guide plate 122 is connected with the other end of the circular arc plate 123. The first wind guide plate 121 and the second wind guide plate 122 form a wind guide channel 124 therebetween. In the wind guide direction of the wind guide channel 124, the second wind guide plate 122 is arranged to extend away from the first wind guide plate 121. A wind guide portion 125 in the shape of a circular arc is arranged between the circular arc plate 123 and the second wind guide plate 122. The outer arc surface radius R1 of the wind guide portion 125 is arranged to be between 14mm and 20mm (see Fig. 1). The outer arc surface of the wind guide portion 125 is an arc transition structure between the circular arc plate 123 and the second wind guide plate 122. The airflow smoothly transitions from the circular arc plate to the direction of the second wind guide plate. The airflow passes through the outer arc surface of the circular arc plate-wind guide portion-second wind guide plate. The outer arc surface radius R1 of the wind guide portion 125 can also be referred to as the outer radius R1 or the inner radius R1 of the wind guide portion 125. Figure 3 The outer arc surface of the wind guide portion 125 is an arc transition structure between the circular arc plate 123 and the second wind guide plate 122. The airflow smoothly transitions from the circular arc plate to the direction of the second wind guide plate. The airflow passes through the outer arc surface of the circular arc plate-wind guide portion-second wind guide plate. The outer arc surface radius R1 of the wind guide portion 125 can also be referred to as the outer radius R1 or the inner radius R1 of the wind guide portion 125.

[0034] Specifically, when the air treatment device 100 is applied, the motor 200 corresponding to the impeller is loaded on the mounting portion 112, and the centrifugal impeller 300 of the impeller is loaded on the inner side of the air guide baffle 120 and connected with the driving shaft of the motor 200. The motor 200 drives the centrifugal impeller 300 to rotate circumferentially, and the external air flows into the inner side of the circular arc plate 123 from the air inlet 111, and the airflow flows into the air guide channel 124 under the action of the centrifugal impeller 300. Among them, along the air guide direction of the air guide channel 124, the second air guide plate 122 is arranged to extend away from the first air guide plate 121, so that after the airflow enters the air guide channel 124, the airflow diffuses and flows under the guidance of the second air guide plate 122.

[0035] Among them, the circular arc plate 123, the first air guide plate 121 and the second air guide plate 122 are designed as an integral structure, eliminating the traditional splicing or welding joints, avoiding air leakage or structural deformation caused by weak connection points, also enhancing the overall rigidity, reducing vibration and noise when the impeller rotates at high speed; improve the airflow sealing performance in the air guide channel, reduce the energy loss of turbulent flow, and improve the air dynamic efficiency.

[0036] Among them, the air guide portion 125 in the circular arc shape is arranged between the circular arc plate 123 and the second air guide plate 122, and the inner radius R1 of the air guide portion 125 is arranged between 14mm and 20mm, such as the inner radius R1 of the air guide portion 125 is arranged between 15mm and 17mm, or the inner radius R1 of the air guide portion 125 is arranged between 14mm, 15mm, 16mm, 17mm, 18mm, 19mm and 20mm. Through testing, the size of the air guide portion 125 is more appropriate, that is, the size of the air guide portion 125 is not too large or too small, so that the airflow can smoothly enter the air guide channel 124 and diffuse outward along the extension direction of the second air guide plate 122, thereby reducing the obvious noise generated when the airflow passes through the air guide portion 125. The specific size design of the outer arc surface radius of the air guide portion smoothly transitions the high-speed airflow output by the impeller from the circular arc plate to the second air guide plate direction, avoids turbulence or separation of the airflow due to sudden turning, reduces the impact and friction of the airflow with the wall surface, reduces energy loss, ensures uniform diffusion of the airflow along the extension direction of the second air guide plate, and improves the uniformity of the outlet air volume. The outer arc surface design of the air guide portion optimizes the outlet air pressure gradient, controls the flow velocity distribution of the airflow on the surface of the air guide portion through the arc curvature of the specific outer arc surface radius, forms a gradually expanding flow channel, for example, gradually converts the high-pressure kinetic energy at the outlet of the impeller into static pressure, improves the overall static pressure efficiency of the device, suppresses the uneven diffusion of the airflow caused by centrifugal force, avoids the formation of local vortex, and at the same time, the arc air guide portion eliminates the airflow separation phenomenon at the right angle or acute angle, reduces the high-frequency turbulent noise source.

[0037] As Figure 6As shown, in a quiet environment, the background noise / ambient noise was 16dB. During the application of the air handling unit 100, the decibel level detected by the monitoring equipment remained relatively stable, without any abnormal or excessively high decibel levels, such as no abnormal noise exceeding 40dB. The air handling unit provided a good user experience.

[0038] Furthermore, the outer radius of the air guide is set at 16mm. More precisely, the radius of the outer arc surface of the air guide 125 facing the air guide channel 124 is set at 16mm. This setting further reduces the noticeable noise generated when the airflow passes through the air guide 125.

[0039] like Figure 7 As shown, when the outer radius of the air guide is set to 7mm, under the same test conditions, there will be a noticeable whistling sound caused by the blade air duct when the impeller is running at high speed. There is a peak with a frequency of 850Hz and a sound intensity of 48dB. The overall noise is also relatively high, reaching 53.8dB.

[0040] In some embodiments, refer to Figure 2 and Figure 3 A line from at least a portion of the outer arc surface of the air guide 125 to the center point of the arc plate 123 is defined as the first parameter line 140. A line passing through the center point of the arc plate 123 and generally aligned with the opening direction of the air guide channel 124 is defined as the second parameter line 150. More precisely, a line passing through the center point of the arc plate and pointing upwards relative to the air handling device is defined as the second parameter line. For example, if the air handling device 100 is in a vertical position during application, and the air outlet of the air guide channel 124 is generally upwards, then the second parameter line 150 is a vertically upward-extending line connecting to the center point of the centrifugal impeller 300. The angle α1 between the first parameter line 140 and the second parameter line 150 is set between 5 degrees and 15 degrees, such as 5 degrees, 7 degrees, 10 degrees, 13 degrees, or 15 degrees.

[0041] It is understandable that the angle α1 between the first parameter line 140 and the second parameter line 150 is set between 5 and 15 degrees. With this setting, there is a suitable distance between the air guide section 125 and the first air guide plate 121, so that the airflow can flow smoothly into the air guide channel 124 and diffuse along the second air guide plate 122. Furthermore, the setting of the above angle further ensures that the airflow will not generate much noise when passing through the air guide section 125.

[0042] Furthermore, referring to Figure 2 and Figure 3The air guide part 125 has a guide arc surface facing the air guide channel 124, and the first parameter line 140 is tangent to the guide arc surface 126. In this way, the position of the air guide part 125 is further defined, so that the air guide part 125 has a proper spacing with the first air guide plate 121, and the air flow can smoothly flow into the air guide channel 124 and be diffused along the second air guide plate 122; and the above-mentioned angle setting further makes the air flow not produce a large noise when passing through the air guide part 125.

[0043] In some embodiments, the impeller is a centrifugal impeller 300, and the motor 200 is connected with the centrifugal impeller 300 arranged in the arc plate 123. Specifically, the motor 200 is arranged in the mounting part 112, and the driving shaft of the motor 200 extends along the central axis of the arc plate 123. The centrifugal impeller 300 includes a circular end cover 310, a plurality of centrifugal blades 320, and an annular frame 370, wherein the circular end cover 310 is arranged on the inner side of the arc plate 123 and is spaced apart from the mounting plate 110, the central position of the circular end cover 310 is provided with a connecting part 312, and the driving shaft of the motor 200 is connected with the connecting part 312. The annular frame 370 is arranged on the side of the circular end cover 310 close to the mounting plate 110 and corresponds to the edge of the circular end cover 310. The plurality of centrifugal blades 320 are arranged in sequence around the circular end cover 310, each centrifugal blade 320 extends towards the mounting plate 110 and is connected with the annular frame 370, and the adjacent centrifugal blades 320 form an air outlet channel. Therefore, the motor 200 drives the circular end cover 310 to rotate around the central axis, thereby driving each centrifugal blade 320 to rotate circumferentially.

[0044] In specific applications, the motor 200 drives the centrifugal blades 320 to rotate circumferentially, and the air flow entering from the air inlet 111 flows into the air guide channel 124 from the air outlet channel under the action of the centrifugal impeller 300, thereby delivering the air flow to the required position. It can be understood that the centrifugal impeller 300 of this structure cooperates with the air treatment device 100 of the above structure, and in application, can effectively guide the generated air flow to the required position and reduce the noise generated by the air flow in the flow process.

[0045] In some embodiments, referring to Figure 3 And Figure 4, each centrifugal fan blade 320 is arranged in an arc shape along the radial direction of the circular end cover 310, and the inner arc surface of the adjacent centrifugal fan blades forms an air outlet channel. The inner arc surface of the centrifugal fan blade close to one end of the connecting portion 312 is an air inlet end 321, the tangent line of the air inlet end 321 is defined as a third parameter line 330, and the line passing through the air inlet end 321 and the center point of the circular end cover 310 is defined as a fourth parameter line 340. The included angle a1 between the third parameter line 330 and the fourth parameter line 340 is set to be between 0 degrees and 10 degrees, such as 1 degree, 3 degrees, 5 degrees, 7 degrees, 8 degrees or 10 degrees. It can be understood that the centrifugal fan blade adopts the above size setting, and through testing, the airflow can smoothly enter the air outlet channel when flowing into the air outlet channel, and the obvious noise is reduced.

[0046] Further, the included angle between the third parameter line and the fourth parameter line is set to be between 3 degrees and 8 degrees, such as 3 degrees, 5 degrees, 7 degrees or 8 degrees. It can be understood that the centrifugal fan blade adopts the above size setting, and through testing, the airflow can smoothly enter the air outlet channel when flowing into the air outlet channel, and the obvious noise is reduced, and especially the abnormal noise greater than 40DB can be effectively avoided.

[0047] In some embodiments, referring to Figure 3 and Figure 4 , each centrifugal fan blade 320 is arranged in an arc shape along the radial direction of the circular end cover 310, and the inner arc surface of the adjacent centrifugal fan blades forms an air outlet channel. The inner arc surface of the centrifugal fan blade away from one end of the connecting portion 312 is an air outlet end 322, the tangent line of the air outlet end 322 is defined as a fifth parameter line 350, and the line passing through the air outlet end 322 and the center point of the circular end cover 310 is defined as a sixth parameter line 360. The included angle a3 between the fifth parameter line 350 and the sixth parameter line 360 is set to be between 110 degrees and 115 degrees, such as 110 degrees, 111 degrees, 112 degrees, 113 degrees, 114 degrees or 115 degrees. It can be understood that the centrifugal fan blade adopts the above size setting, and through testing, the airflow can smoothly enter the air outlet channel when flowing into the air outlet channel, and the obvious noise is reduced.

[0048] Further, the number of centrifugal fan blades 320 is set to be between 48 and 55, and the inner diameter R2 of each centrifugal fan blade 320 is set to be between 27 mm and 33 mm, such as 27 mm, 29 mm, 31 mm or 33 mm. It can be understood that the number of centrifugal fan blades 320 is set to be above, and the inner diameter of each centrifugal fan blade 320 is set to be above. Through testing, the airflow can smoothly flow out along the air outlet channel, and the obvious noise is reduced.

[0049] In some embodiments, referring to Figure 3 and Figure 4, the end of the centrifugal fan blade 320 away from the connecting portion 312 and the outer arc surface of the centrifugal fan blade 320 is provided with a wind guide inclined surface or a wind guide arc surface 323. In this way, when the airflow flows out of the air outlet channel, the airflow has a circumferential movement tendency, and therefore, the tail end of the centrifugal fan blade 320 in the reverse direction of the air outlet channel may affect the outflow of the airflow. Therefore, the tail end of the centrifugal fan blade 320 is provided with a wind guide inclined surface or a wind guide arc surface 323, which can effectively guide the airflow to flow to the air guide channel 124 and reduce the noise generated when the airflow flows out of the air outlet channel.

[0050] In some embodiments, with reference to Figure 3 With Figure 4 The circular end cover 310 is provided with an opening 311 arranged around the connecting portion 312, so that the weight of the centrifugal impeller 300 is effectively reduced, thereby saving the energy consumption of the motor 200. At the same time, the opening 311 on the circular end cover 310 can also provide airflow for the centrifugal impeller 300, thereby improving the working efficiency of the centrifugal impeller 300.

[0051] The application discloses an air treatment device, with reference to 3 to Figure 5 , comprising the above-mentioned fan assembly, such as the fan assembly vertically arranged in the body of the air treatment device, and the air outlet of the air guide channel 124 is arranged upward.

[0052] It can be understood that the air treatment device adopts the above-mentioned fan assembly, and the fan assembly adopts the above-mentioned air treatment device 100. In specific application, the motor 200 drives the centrifugal fan blade 320 to rotate circumferentially, and the airflow entering from the air inlet 111 flows into the air guide channel 124 from the air outlet channel under the action of the centrifugal impeller 300, thereby delivering the airflow to an upward position. It can be understood that the centrifugal impeller 300 of this structure cooperates with the above-mentioned air treatment device 100, and in application, the generated airflow can be effectively guided to the required position, and the obvious noise generated in the airflow process is reduced, and the air treatment device has better use experience.

[0053] The technical means disclosed in the utility model scheme is not only limited to the technical means disclosed in the above-mentioned embodiments, but also includes the technical scheme composed of any combination of the above technical features. It should be noted that for ordinary skilled persons in the art, without departing from the principle of the utility model, some improvements and refinements can be made, and these improvements and refinements are also considered as the protection scope of the utility model.

Claims

1. An air treatment device, characterized in that, The utility model relates to an air handling device, comprising: a mounting plate provided with a mounting portion for mounting an impeller; a wind guide fence comprising a circular arc plate, a first wind guide plate and a second wind guide plate connected together, the circular arc plate being arranged at the mounting plate and on the periphery of the impeller, the first wind guide plate being connected to one end of the circular arc plate, the second wind guide plate being connected to the other end of the circular arc plate, and a wind guide channel being formed between the first wind guide plate and the second wind guide plate; wherein the second wind guide plate extends away from the first wind guide plate, an arc-shaped wind guide portion is arranged between the circular arc plate and the second wind guide plate, and the radius of the outer arc surface of the wind guide portion is set to be between 14 mm and 20 mm.

2. The air treatment device of claim 1, wherein, The outer radius of the wind guide portion is set to be 16 mm.

3. The air treatment device of claim 1, wherein, At least part of the position of the outer arc surface of the wind guide portion to the center point of the impeller defines a first parameter line, a line passing through the center point of the circular arc plate and upward relative to the air handling device defines a second parameter line, and the included angle between the first parameter line and the second parameter line is set to be between 5 degrees and 15 degrees.

4. The air treatment device of claim 3, wherein, The wind guide portion has a guide arc surface facing the wind guide channel, and the first parameter line is tangent to the guide arc surface.

5. The air treatment device of claim 1, wherein, The impeller is a centrifugal impeller, the centrifugal impeller comprises a circular end cover and a plurality of centrifugal blades, a connecting portion is arranged at the center position of the circular end cover, the plurality of centrifugal blades are arranged in sequence around the circular end cover, and an air outlet channel is formed between adjacent centrifugal blades; wherein, along the radial direction of the circular end cover, the centrifugal blades are arranged in an arc shape.

6. The air treatment device of claim 5, wherein, The inner arc surface of the centrifugal blade close to one end of the connecting portion is an air inlet end, a tangent line of the air inlet end defines a third parameter line, a line passing through the air inlet end and the center point of the circular end cover defines a fourth parameter line, and the included angle between the third parameter line and the fourth parameter line is set to be between 0 degrees and 10 degrees.

7. The air treatment device of claim 6, wherein, The included angle between the third parameter line and the fourth parameter line is set to be between 3 degrees and 8 degrees.

8. The air treatment device of claim 5, wherein, The inner arc surface of the centrifugal blade away from one end of the connecting portion is an air outlet end, a tangent line of the air outlet end defines a fifth parameter line, a line passing through the air outlet end and the center point of the circular end cover defines a sixth parameter line, and the included angle between the fifth parameter line and the sixth parameter line is set to be between 110 degrees and 115 degrees.

9. The air treatment device of claim 5, wherein, The number of the centrifugal blades is set to be between 48 and 55, and the inner diameter of the centrifugal blades is set to be between 27 mm and 33 mm.

10. The air treatment device of claim 5, wherein, A wind guide inclined surface or a wind guide arc surface is arranged between the end portion of the centrifugal blade away from the connecting portion and the outer arc surface of the centrifugal blade, and the circular end cover is provided with an opening arranged around the connecting portion.

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