Centrifugal wind wheel, centrifugal fan and device with centrifugal fan

Abstract

The utility model relates to the technical field of electric appliance products, and discloses a centrifugal wind wheel, a centrifugal fan and a device with the centrifugal fan, the centrifugal wind wheel comprises a plurality of fan blades arranged along the circumferential direction, the thickness of the fan blades is gradually increased and then gradually reduced along the direction far away from the center of the centrifugal wind wheel, and the thickness of the fan blades is gradually increased and then gradually reduced along the direction far away from the center of the centrifugal wind wheel. And an overflowing gap between every two adjacent fan blades is gradually increased and then gradually reduced. The direction far away from the center of the centrifugal wind wheel is actually the wind outlet direction, the overflowing gap between every two adjacent fan blades is gradually increased and then gradually decreased in the wind outlet direction, the overflowing gap is increased so that wind can smoothly enter the overflowing gap, the overflowing gap is decreased so that the flow speed of airflow can be increased, and therefore the airflow can be accelerated when flowing through the overflowing gap, and the flow speed of the airflow can be increased. Vortex at the inlet of the fan blade can be eliminated, efficiency can be improved, and noise can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical products, in particular to a centrifugal wind wheel, a centrifugal fan and a device with the centrifugal fan. Background Art

[0002] A centrifugal fan consists of a volute and an impeller mounted within it, which includes multiple blades. Traditional blades are generally arc-shaped. Research has shown that these blades have poor performance, resulting in low fan efficiency and high noise levels. Since centrifugal fans are commonly used in everyday environments like air conditioning coils and range hoods, the aerodynamic noise they generate can negatively impact the user experience. Utility Model Content

[0003] In view of this, the utility model provides a centrifugal wind wheel, a centrifugal fan and a device having a centrifugal fan to solve the problems of low fan efficiency and high noise.

[0004] In the first aspect, the utility model provides a centrifugal wind wheel, comprising a plurality of wind blades arranged along the circumferential direction. In the direction away from the center of the centrifugal wind wheel, the thickness of the wind blades first gradually increases and then gradually decreases, and the flow gap between two adjacent wind blades first gradually increases and then gradually decreases.

[0005] Beneficial effects: The direction away from the center of the centrifugal wind wheel is actually the wind outlet direction. Since the flow gap between two adjacent fan blades gradually increases and then gradually decreases along the wind outlet direction, the increase in the flow gap will allow the wind to enter the flow gap smoothly, and the decrease in the flow gap will cause the airflow velocity to accelerate. Therefore, the airflow passing through the flow gap will first accelerate, which can eliminate the vortex at the fan blade inlet, which is beneficial to improve efficiency and reduce noise.

[0006] In an optional embodiment, the fan blade has a leading edge and a trailing edge, and in a cross section perpendicular to the axial direction of the centrifugal fan wheel, the leading edge and / or the trailing edge includes a plurality of smoothly connected arc segments.

[0007] Beneficial effect: Since the leading edge and / or trailing edge of the fan blade includes multiple smoothly connected arc segments, the work capacity of the fan blade can be improved and the efficiency can be improved.

[0008] In an optional embodiment, there are a first tangent circle and a second tangent circle between two adjacent wind blades, the first tangent circle and the second tangent circle are tangent to the two wind blades at the same time, and the first tangent circle is tangent to the trailing edge of one of the wind blades at the point of maximum thickness, and the second tangent circle is tangent to the end of the leading edge of the other wind blade away from the center of the centrifugal wind wheel, the diameter of the first tangent circle is δmax, the diameter of the second tangent circle is δmin, 1<δmax / δmin≤2.

[0009] In an optional embodiment, the inscribed circle of the fan blade at the maximum thickness is the third inscribed circle, the inscribed circle of the fan blade at the end of its trailing edge away from the center of the centrifugal wind wheel is the fourth inscribed circle, the diameter of the third inscribed circle is Φmax, the diameter of the fourth inscribed circle is Φmin, and 1<Φmax / Φmin≤2.

[0010] In an optional embodiment, the thickness of the fan blade is Φ, 1.6mm≤Φ≤3mm;

[0011] And / or, the flow gap is δ, 4mm≤δ≤7mm.

[0012] Beneficial effects: By experimentally comparing centrifugal wind wheels that meet this range with traditional centrifugal wind wheels, the air volume and outlet wind speed are effectively improved, which can delay airflow separation, reduce tail vortex shedding, and effectively reduce sound pressure noise.

[0013] In an optional embodiment, the radius of the circle where the center line of the fan blade is located is R, 9.5mm≤R≤10mm;

[0014] And / or, the distribution angle of the fan blades is θ, 8°≤θ≤9°;

[0015] And / or, the line where the end of the fan blade is away from the center of the centrifugal wind wheel is located is the first line, the circle where the center line of the fan blade is located is the first circle, and the angle between the tangent of the first circle at the intersection with the first line and the first line is β, 75°≤β≤80°.

[0016] Beneficial effect: The angle between the tangent of the first circle at the intersection with the first line and the first line specifically points out the outlet angle. The outlet angle affects the separation of the airflow at the rear of the fan blade. By making the outlet angle between 75° and 80°, the airflow separation can be reduced and the aerodynamic efficiency can be improved.

[0017] In a second aspect, the present invention further provides a centrifugal fan including a volute and the centrifugal impeller.

[0018] Beneficial effect: Since the leading edge and / or trailing edge of the fan blade includes multiple smoothly connected arc segments, the work capacity of the fan blade can be improved and the efficiency can be improved.

[0019] In an optional embodiment, the volute includes a volute tongue and a volute throat, the outer surface of the volute includes an Archimedean spiral surface, the starting end of the Archimedean spiral surface is connected to the volute tongue, and the end of the Archimedean spiral surface is connected to the volute throat, and the radial dimension of the outer wall of the volute gradually increases from the starting end to the end.

[0020] Beneficial effect: The outer surface of the volute includes an Archimedean spiral surface, which can better reduce the air output of the centrifugal fan and improve work efficiency.

[0021] In an optional embodiment, on a cross section perpendicular to the axial direction of the centrifugal wind wheel, the profile of the volute includes an Archimedean spiral, the starting angle of the Archimedean spiral is α, the outlet angle of the Archimedean spiral is Y, the spiral opening of the Archimedean spiral is x, 50°<α<90°, 0<Y<90°, 15mm / rad<x<45mm / rad.

[0022] Beneficial effects: The spiral opening is smaller, which reduces the divergence distance of the air duct spiral line, can improve the air collection capacity, increase the wind pressure, and reduce the flow loss in the volute.

[0023] In an optional embodiment, along the radial direction, the gap between the volute at the starting end and the centrifugal wind wheel is the smallest, and the gap between the volute at the starting end and the centrifugal wind wheel is d, 5mm<d<10mm;

[0024] And / or, the angle between the tangent line of the Archimedean spiral surface at the starting end and the extension line of the snail throat is the snail tongue angle, and the snail tongue angle is ε, 0°<ε<90°.

[0025] Beneficial effect: The inclined volute tongue design can effectively reduce the turbulence between the centrifugal impeller and the volute tongue, suppress rotation noise, and improve the operating efficiency and reliability of the fan.

[0026] In an optional embodiment, air enters from both sides of the centrifugal wind wheel, the air inlet length of the first side of the centrifugal wind wheel is L1, the air inlet length of the second side of the centrifugal wind wheel is L2, a motor bracket is provided in the volute, the first side of the centrifugal wind wheel is close to the motor bracket, and L1<L2.

[0027] Beneficial Effect: Since air enters from both sides of the centrifugal impeller, the air volume can be increased. Since the first side of the centrifugal impeller is close to the motor bracket, the air inlet area on the first side is small, making the air inlet length on the first side of the centrifugal impeller shorter than the air inlet length on the second side of the centrifugal impeller, which can increase the overall air volume.

[0028] In an optional embodiment, the volute includes a left volute and a right volute, the centrifugal wind wheel is installed on the fan shaft of the left volute, and the left volute is connected to the right volute.

[0029] Beneficial effect: By making the volute include a left volute and a right volute, it is convenient to install the centrifugal wind wheel inside the volute.

[0030] In an optional embodiment, in the axial direction, the gap between the centrifugal wind wheel and the left volute is a, and the gap between the centrifugal wind wheel and the right volute is b, and a≤b.

[0031] Beneficial effect: by setting an assembly gap between the centrifugal impeller and the left volute and the right volute, assembly is facilitated and assembly failure due to size error is avoided.

[0032] In a third aspect, the present invention further provides a device having a centrifugal fan, comprising:

[0033] The centrifugal fan.

[0034] Beneficial effects: The device with a centrifugal fan can improve the working capacity of the centrifugal fan blades and improve efficiency. It can also increase the air volume and air outlet speed, and effectively reduce sound pressure and noise.

[0035] In an optional embodiment, the device having a centrifugal fan is a bladeless fan.

[0036] Beneficial effects: This bladeless fan can improve the work capacity of the centrifugal fan blades and improve efficiency. It can also increase the air volume and air speed, and effectively reduce sound pressure and noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 This is a schematic structural diagram of a centrifugal wind wheel according to an embodiment of the present utility model;

[0039] Figure 2 for Figure 1 The front view of the centrifugal wind wheel shown;

[0040] Figure 3 A schematic diagram comparing the fan blades of the embodiment of the utility model and the traditional fan blades;

[0041] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0042] Figure 5 This is a schematic diagram of the centrifugal wind wheel of the embodiment of the utility model showing only two adjacent wind blades;

[0043] Figure 6 for Figure 5 Enlarged view of point B in the middle;

[0044] Figure 7This is a structural schematic diagram of a centrifugal fan according to an embodiment of the present utility model;

[0045] Figure 8 for Figure 7 Schematic diagram of the structure when the left and right volutes are assembled together;

[0046] Figure 9 for Figure 7 An exploded view of a centrifugal fan is shown;

[0047] Figure 10 A schematic diagram showing the air inlet and outlet directions of a centrifugal fan;

[0048] Figure 11 It is a side view of the centrifugal wind wheel;

[0049] Figure 12 for Figure 7 A cross-sectional view of a centrifugal fan is shown;

[0050] Figure 13 It is a schematic diagram of the volute profile of a centrifugal fan;

[0051] Figure 14 This is a schematic diagram of a device with a centrifugal fan according to an embodiment of the present invention;

[0052] Figure 15 for Figure 14 A front view of a device having a centrifugal fan is shown;

[0053] Figure 16 It is a simulation diagram of simulating a traditional centrifugal fan and the centrifugal fan of this embodiment;

[0054] Figure 17 A comparison diagram of the relationship between pressure and air volume of the volute of the traditional volute and the volute of this embodiment;

[0055] Figure 18 This is a simulation diagram of a traditional wind blade;

[0056] Figure 19 This is a simulation diagram of the bionic fan blade of this embodiment.

[0057] Description of reference numerals:

[0058] 1. Left volute; 101. Motor bracket; 2. Right volute; 3. Centrifugal impeller; 301. Fan blade; 3011. Leading edge; 3012. Trailing edge; 302. First line; 303. First circle; 4. Volute tongue; 5. Volute throat; 6. Head air duct; 1a. Traditional fan blade. DETAILED DESCRIPTION

[0059] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0060] A centrifugal fan includes a volute and an impeller disposed inside the volute, and the impeller includes a plurality of blades. The traditional blades are generally arc-shaped. Studies have shown that the traditional blades have poor working capacity, which leads to low fan efficiency. Related technologies usually increase the air outlet area to increase the air volume and efficiency, but increasing the air outlet area will cause the size of the volute to increase. Therefore, how to improve the air outlet efficiency of the centrifugal fan without increasing the size of the volute has always been a technical direction of research in this field. Centrifugal fans make a lot of noise during operation. Since centrifugal fans are often used in living environments such as air-conditioning coils and range hoods, the aerodynamic noise generated by their operation will affect the user experience.

[0061] The following combination Figures 1 to 19 , describing the embodiments of the present utility model.

[0062] According to an embodiment of the present invention, in a first aspect, a centrifugal wind wheel 3 is provided, comprising a plurality of wind blades 301 arranged along the circumferential direction. In the direction away from the center of the centrifugal wind wheel 3, the thickness of the wind blades 301 first gradually increases and then gradually decreases, and the flow gap between two adjacent wind blades 301 first gradually increases and then gradually decreases.

[0063] In this embodiment, the direction away from the center of the centrifugal wind wheel 3 is actually the wind outlet direction. Since the flow gap between two adjacent fan blades 301 gradually increases and then gradually decreases along the wind outlet direction, the increase in the flow gap will allow the wind to smoothly enter the flow gap, and the decrease in the flow gap will cause the airflow velocity to accelerate. Therefore, the airflow passing through the flow gap will be accelerated, which can eliminate the vortex at the entrance of the fan blade 301, which is beneficial to improving efficiency and reducing noise.

[0064] It should be noted that the fan blade 301 has a leading edge 3011 and a trailing edge 3012 , and the thickness of the fan blade 301 refers to the distance between the leading edge 3011 and the trailing edge 3012 .

[0065] In one embodiment, the fan blade 301 has a leading edge 3011 and a trailing edge 3012 . In a cross section perpendicular to the axial direction of the centrifugal fan wheel 3 , the leading edge 3011 and / or the trailing edge 3012 includes a plurality of smoothly connected arc segments.

[0066] In this embodiment, since the leading edge 3011 and / or the trailing edge 3012 of the fan blade 301 includes a plurality of smoothly connected arc segments, the working capacity of the fan blade 301 can be improved and the efficiency can be improved.

[0067] Specifically in one embodiment, the leading edge 3011 and the trailing edge 3012 of the fan blade 301 both include multiple arc segments, which can ensure that the working capacity of the fan blade 301 is improved and the efficiency is improved.

[0068] Specifically in one embodiment, the leading edge 3011 and the trailing edge 3012 of the fan blade 301 each include three arc segments.

[0069] It should be noted that this embodiment does not limit the number of arc segments, and the number can be three or more.

[0070] Specifically in one embodiment, along the direction away from the center of the centrifugal wind wheel 3, the thickness of the fan blade 301 gradually increases and then gradually decreases. Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown, the blades 301 of this embodiment are designed in a dromedary whale-like shape with varying thicknesses, while conventional blades are generally arc-shaped. The thickness of conventional blades remains essentially constant as they move away from the center of the centrifugal impeller. In other words, the blades 301 of this embodiment, designed to mimic the shape of a dromedary whale (referred to as bionic blades 301), can eliminate vortices at the inlet of the blades 301, thereby improving efficiency and reducing noise.

[0071] Traditional fan blades Bionic wind blades <![CDATA[Air volume m 3 / min]]> 240 250↑ Outlet wind speed m / s 4.8 5.1↑ Sound pressure noise dB 61 59.5↓

[0072] Table 1

[0073] According to Table 1, under the premise that the other dimensions and shapes of the centrifugal fan remain unchanged, the air volume, outlet wind speed, and sound pressure and noise of the centrifugal fan using traditional fan blades and the centrifugal fan using bionic fan blades are compared. It is found that the air volume and outlet wind speed are significantly increased, and the sound pressure and noise are significantly reduced.

[0074] By comparing the traditional fan blade 1a with the bionic fan blade 301 of this embodiment, Figure 18 and Figure 19 In this embodiment, the distance between the leading edge 3011 and the trailing edge 3012 of the fan blade 301 is different along the air outlet direction, which effectively improves the air volume and outlet wind speed, delays airflow separation, reduces tail vortex shedding, and effectively reduces sound pressure noise.

[0075] Specific as Figure 18 As shown, the blue dot structure represents the airflow. It can be clearly seen that there is no airflow on some blades, that is, the airflow has separated from the blades, which will cause a higher sound pressure noise. Figure 19 ,and Figure 18In comparison, each fan blade has airflow, so compared with traditional fan blades, it delays flow separation, reduces tail vortex shedding, and can effectively reduce sound pressure noise.

[0076] In one embodiment, Figure 6 As shown, there are a first tangent circle and a second tangent circle between two adjacent wind blades 301, and the first tangent circle and the second tangent circle are tangent to the two wind blades 301 at the same time, and the first tangent circle is tangent to the trailing edge 3012 of one of the wind blades 301 at the point of maximum thickness, and the second tangent circle is tangent to the end of the leading edge 3011 of the other wind blade 301 away from the center of the centrifugal wind wheel 3, the diameter of the first tangent circle is δmax, the diameter of the second tangent circle is δmin, 1<δmax / δmin≤2.

[0077] Specifically in one embodiment, δmax is 7 mm and δmin is 4 mm.

[0078] In one embodiment, further reference is made to Figure 6 The inscribed circle of the fan blade 301 at the maximum thickness is the third tangential circle, and the inscribed circle of the fan blade 301 at the end of its trailing edge 3012 away from the center of the centrifugal wind wheel 3 is the fourth tangential circle. The diameter of the third tangential circle is Φmax, and the diameter of the fourth tangential circle is Φmin, 1<Φmax / Φmin≤2.

[0079] Specifically in one embodiment, Φmax is 3 mm and Φmin is 1.6 mm.

[0080] In one embodiment, the thickness of the fan blade 301 is Φ, 1.6 mm ≤ Φ ≤ 3 mm.

[0081] And / or, the flow gap is δ, 4mm≤δ≤7mm.

[0082] In this embodiment, by experimentally comparing the centrifugal wind wheel 3 that meets this range with the traditional centrifugal wind wheel, the air volume and outlet wind speed are effectively improved, which can delay the airflow separation, reduce the tail vortex shedding, and effectively reduce the sound pressure noise.

[0083] In one embodiment, the radius of the circle where the center line of the fan blade lies is R, and 9.5 mm ≤ R ≤ 10 mm.

[0084] Specifically in one embodiment, the radius of the circle where the center line of the fan blade lies is 9.7 mm.

[0085] Specifically in one embodiment, the radius of the circle where the center line of the fan blade lies is 10 mm.

[0086] Specifically in one embodiment, the radius of the circle where the center line of the fan blade lies is 9.5 mm.

[0087] In one embodiment, the distribution angle of the fan blades is θ, 8°≤θ≤10°.

[0088] It should be noted that the plurality of fan blades are evenly distributed at intervals of a distribution angle θ in the circumferential direction.

[0089] Specifically in one embodiment, the distribution angle of the fan blades is 8°.

[0090] Specifically in one embodiment, the distribution angle of the fan blades is 9°.

[0091] Specifically in one embodiment, the distribution angle of the fan blades is 10°.

[0092] In one embodiment, the line where the end of the fan blade is away from the center of the centrifugal wind wheel 3 is located is the first line 302, the circle where the center line of the fan blade is located is the first circle 303, and the angle between the tangent of the first circle 303 at the intersection with the first line 302 and the first line 302 is β, 75°≤β≤80°.

[0093] In this embodiment, the angle between the tangent of the first circle 303 at the intersection with the first line 302 and the first line 302 specifically points out the outlet angle. The outlet angle affects the separation of the airflow at the rear of the fan blade 301. By making the outlet angle between 75° and 80°, the airflow separation can be reduced and the aerodynamic efficiency can be improved.

[0094] According to an embodiment of the present invention, in a second aspect, a centrifugal fan is provided, comprising a volute and the centrifugal impeller 3 provided in the above embodiment.

[0095] In this embodiment, since the leading edge 3011 and / or the trailing edge 3012 of the fan blade 301 includes a plurality of smoothly connected arc segments, the working capacity of the fan blade 301 can be improved and the efficiency can be improved.

[0096] like Figure 18 and Figure 19 , a simulation comparison was conducted between the centrifugal wind wheel 3 and the traditional centrifugal wind wheel, and it was found that the air volume and outlet wind speed of the centrifugal wind wheel 3 were effectively improved, which can delay the air flow separation, reduce the tail vortex shedding, and effectively reduce the sound pressure noise. Figure 18 As shown, the blue dot structure represents the airflow. It can be clearly seen that there is no airflow on some blades, that is, the airflow has separated from the blades, which will cause a higher sound pressure noise. Figure 19 ,and Figure 18 In comparison, each fan blade has airflow, so compared with traditional fan blades, it delays flow separation, reduces tail vortex shedding, and can effectively reduce sound pressure noise.

[0097] In one embodiment, the volute includes a volute tongue 4 and a volute throat 5, and the outer surface of the volute includes an Archimedean spiral surface. The starting end of the Archimedean spiral surface is connected to the volute tongue 4, and the end of the Archimedean spiral surface is connected to the volute throat 5. From the starting end to the end, the radial dimension of the outer wall of the volute gradually increases.

[0098] In this embodiment, the outer surface of the volute includes an Archimedean spiral surface, which can better reduce the air output of the centrifugal fan and improve work efficiency.

[0099] In one embodiment, on a cross section perpendicular to the axial direction of the centrifugal impeller 3, the profile of the volute includes an Archimedean spiral, the starting angle of the Archimedean spiral is α, the outlet angle of the Archimedean spiral is Y, the spiral opening of the Archimedean spiral is x, 50°<α<90°, 0<Y<90°, 15mm / rad<x<45mm / rad.

[0100] It should be noted that the exit angle of the Archimedean spiral refers to the angle between the tangent line at the end of the Archimedean spiral and the vertical plane.

[0101] Specifically in one embodiment, the starting angle of the Archimedean spiral is 77°, and the exit angle of the Archimedean spiral is 8°.

[0102] Specifically in one embodiment, within a plane, the Archimedean spiral can be represented by the equation r=R+xt, theta=r0+360t, where r refers to the radius of the Archimedean spiral, x refers to the increase in radius per degree, that is, the spiral opening, and theta refers to the angle between the line connecting a certain point of the Archimedean spiral and the origin of the coordinate system and the X-axis.

[0103] Specifically in one embodiment, R=82 mm, r0=70°, 0≤t≤1, 15 mm / rad<x<45 mm / rad.

[0104] In this embodiment, the spiral opening is small, which reduces the divergence distance of the air duct spiral line, can improve the air collection capacity, increase the wind pressure, and reduce the flow loss in the volute.

[0105] Specifically in one embodiment, x=35 mm / rad.

[0106] In one embodiment, along the radial direction, the gap between the volute at the starting end and the centrifugal wind wheel 3 is the smallest, and the gap between the volute at the starting end and the centrifugal wind wheel 3 is d, 5mm<d<10mm.

[0107] In this embodiment, the gap between the volute at the starting end and the centrifugal impeller 3 is small, which can reduce eddy currents and turbulence and improve the operating efficiency and reliability of the fan.

[0108] Specifically in one embodiment, d=6.5 mm.

[0109] In one embodiment, the angle between the tangent line of the Archimedean spiral surface at the starting end and the extension line of the snail throat 5 is the snail tongue angle, and the snail tongue angle is ε, where 0°<ε<90°.

[0110] In this embodiment, the inclined volute tongue 4 is designed to effectively reduce the turbulence between the centrifugal impeller 3 and the volute tongue 4, suppress the rotation noise, and improve the operating efficiency and reliability of the fan.

[0111] Specifically in one embodiment, the tongue angle is 66°.

[0112] Combine Figure 16 , Figure 16 is the turbulent kinetic energy cloud map, Figure 16 The left picture in the middle is a centrifugal fan with a traditional volute + straight volute tongue, and the right picture is a centrifugal fan with a volute + inclined volute tongue in this embodiment. Simulation analysis is performed on the centrifugal fan with a traditional volute + straight volute tongue and the centrifugal fan with a volute + inclined volute tongue in this embodiment. The traditional centrifugal fan has a large turbulent kinetic energy at the volute tongue, which is as high as 2.2 J / kg. The maximum turbulent kinetic energy at the volute tongue of the centrifugal fan in this embodiment is reduced from 2.2 J / kg to 1.5 J / kg. Therefore, the simulation analysis can effectively prove that the inclined volute tongue design adopted in this application can effectively reduce the turbulence between the centrifugal wind wheel 3 and the volute tongue 4, and suppress the rotation noise.

[0113] It should be noted that high turbulent kinetic energy means that there are more irregular movements in the airflow, while low turbulent kinetic energy means that the airflow is relatively smooth. High turbulent kinetic energy will produce more eddies and vibrations, thereby increasing noise and possibly causing fluctuations in wind speed and a reduction in wind volume.

[0114] In one embodiment, Figure 10 As shown, the air enters from both sides of the centrifugal wind wheel 3, as shown in FIG. Figure 11 As shown, the air inlet length of the first side of the centrifugal wind wheel 3 is L1, the air inlet length of the second side of the centrifugal wind wheel 3 is L2, a motor bracket 101 is provided in the volute, the first side of the centrifugal wind wheel 3 is close to the motor bracket 101, L1<L2.

[0115] In this embodiment, air intake is provided on both sides of the centrifugal fan wheel 3, thereby increasing the air volume. Since the first side of the centrifugal fan wheel 3 is close to the motor bracket 101, the air intake area of ​​the first side is small, making the air intake length of the first side of the centrifugal fan wheel 3 shorter than the air intake length of the second side of the centrifugal fan wheel 3, thereby increasing the overall air intake volume.

[0116] Specifically in one embodiment, L1 = 47.5 mm, L2 = 64 mm.

[0117] Specifically in one embodiment, the diameter of the centrifugal wind wheel 3 is D, where D=152 mm.

[0118] In one embodiment, the volute includes a left volute 1 and a right volute 2 , the centrifugal wind wheel 3 is installed on the fan shaft of the left volute 1 , and the left volute 1 and the right volute 2 are docked.

[0119] In this embodiment, the volute includes a left volute 1 and a right volute 2 , so that the centrifugal impeller 3 is easily installed inside the volute.

[0120] Specifically in one embodiment, the left volute 1 is provided with a motor bracket 101 .

[0121] Specifically in one embodiment, the left volute 1 and the right volute 2 are fixedly connected by screws and / or buckles.

[0122] In one embodiment, Figure 12 As shown, in the axial direction, the gap between the centrifugal wind wheel 3 and the left volute 1 is a, and the gap between the centrifugal wind wheel 3 and the right volute 2 is b, and a≤b.

[0123] In this embodiment, an assembly gap is provided between the centrifugal impeller 3 and the left volute 1 and the right volute 2 to facilitate assembly while avoiding assembly failure due to dimensional error.

[0124] Specifically in one embodiment, a=b=5.5 mm.

[0125] Flow rate (100Pa) noise Torque Traditional volute 223 73 / 98 0.144 This embodiment of the volute 240↑ 73 / 91 0.146

[0126] Table 2

[0127] As shown in Table 2, by comparing the traditional volute and the volute of this embodiment, it can be seen that the flow rate is increased and the noise is reduced.

[0128] The centrifugal fan provided in this embodiment optimizes the profile of the volute, reduces the divergence distance of the air duct spiral line, improves the air collection capacity, improves the air flow, and reduces the flow loss in the volute. The volute tongue 4 of the centrifugal fan adopts an inclined design, which effectively reduces the turbulence between the centrifugal wind wheel 3 and the volute tongue 4 and suppresses the rotation noise. The centrifugal fan has two-way air intake, which increases the air intake area, thereby increasing the air volume and improving the efficiency of the centrifugal fan. The fan blade 301 adopts a round-headed whale shape and a multi-segment circular arc design to improve the working capacity of the fan blade 301 and improve efficiency. The front and rear edges 3012 of the fan blade 301 are designed with non-uniform thickness to delay airflow separation, reduce the shedding of the tail vortex, and reduce noise.

[0129] According to an embodiment of the present invention, in a third aspect, a device having a centrifugal fan is provided, comprising: the centrifugal fan provided in the above embodiment.

[0130] In this embodiment, the device with a centrifugal fan can improve the working capacity of the centrifugal fan blades 301 and improve efficiency. It can also increase the air volume and air outlet speed, and effectively reduce sound pressure and noise.

[0131] In one embodiment, the device having the centrifugal fan is a bladeless fan.

[0132] The bladeless fan can improve the work capacity of the centrifugal fan blades 301 and improve efficiency. It can also increase the air volume and air outlet speed, and effectively reduce sound pressure and noise.

[0133] Specifically in one embodiment, Figure 14 and Figure 15 As shown, the bladeless fan includes a head air duct 6 and an air supply device. The air supply device is used to send high-speed airflow into the head air duct 6, increase the pressure and accelerate it, and shoot it out from the outlet gap at high speed, converge and drive the fluid flow, and send out natural and stable wind.

[0134] Wherein, the air supply device includes the above-mentioned centrifugal fan.

[0135] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by this application.

Claims

1. A centrifugal wind wheel, characterized in that: The invention comprises a plurality of fan blades (301) arranged along the circumferential direction, wherein the thickness of the fan blades (301) first gradually increases and then gradually decreases in a direction away from the center of the centrifugal fan wheel (3), and the flow gap between two adjacent fan blades (301) first gradually increases and then gradually decreases.

2. The centrifugal wind wheel according to claim 1, characterized in that: The fan blade (301) has a leading edge (3011) and a trailing edge (3012); in a cross section perpendicular to the axial direction of the centrifugal fan wheel (3), the leading edge (3011) and / or the trailing edge (3012) comprises a plurality of smoothly connected circular arc segments.

3. The centrifugal wind wheel according to claim 2, characterized in that: A first tangential circle and a second tangential circle are provided between two adjacent fan blades (301), wherein the first tangential circle and the second tangential circle are tangent to the two fan blades (301) at the same time, and the first tangential circle is tangent to the trailing edge (3012) of one of the fan blades (301) at a point of maximum thickness, and the second tangential circle is tangent to an end of the leading edge (3011) of the other fan blade (301) away from the center of the centrifugal wind wheel (3), wherein the diameter of the first tangential circle is δmax, and the diameter of the second tangential circle is δmin, and 1<δmax / δmin≤2.

4. The centrifugal wind wheel according to claim 2, characterized in that: The inscribed circle of the fan blade (301) at the maximum thickness is a third inscribed circle, and the inscribed circle of the fan blade (301) at one end of its trailing edge (3012) away from the center of the centrifugal wind wheel (3) is a fourth inscribed circle. The diameter of the third inscribed circle is Φmax, and the diameter of the fourth inscribed circle is Φmin, where 1<Φmax / Φmin≤2.

5. The centrifugal wind wheel according to claim 1, characterized in that: The thickness of the fan blade (301) is Φ, 1.6mm≤Φ≤3mm; And / or, the flow gap is δ, 4mm≤δ≤7mm.

6. The centrifugal wind wheel according to any one of claims 1 to 5, characterized in that: The radius of the circle where the center line of the fan blade is located is R, 9.5mm≤R≤10mm; and / or, the distribution angle of the fan blades is θ, 8°≤θ≤9°; And / or, the line on which one end of the fan blade is away from the center of the centrifugal fan wheel (3) is located is a first line (302), the circle on which the center line of the fan blade is located is a first circle (303), and the angle between the tangent of the first circle (303) at the intersection with the first line (302) and the first line (302) is β, and 75°≤β≤80°.

7. A centrifugal fan, characterized in that: The invention comprises a volute and a centrifugal impeller (3) according to any one of claims 1 to 6.

8. The centrifugal fan according to claim 7, characterized in that: The volute comprises a volute tongue (4) and a volute throat (5); the outer surface of the volute comprises an Archimedean spiral surface; the starting end of the Archimedean spiral surface is connected to the volute tongue (4); the end of the Archimedean spiral surface is connected to the volute throat (5); and the radial dimension of the outer wall of the volute gradually increases from the starting end to the end.

9. The centrifugal fan according to claim 8, characterized in that: On a cross section perpendicular to the axial direction of the centrifugal wind wheel (3), the profile of the volute includes an Archimedean spiral, the starting angle of the Archimedean spiral is α, the outlet angle of the Archimedean spiral is Y, the spiral opening of the Archimedean spiral is x, 50°<α<90°, 0<Y<90°, 15mm / rad<x<45mm / rad.

10. The centrifugal fan according to claim 8, characterized in that: In the radial direction, the gap between the volute at the starting end and the centrifugal wind wheel (3) is the smallest, and the gap between the volute at the starting end and the centrifugal wind wheel (3) is d, 5mm<d<10mm; And / or, the angle between the tangent line of the Archimedean spiral surface at the starting end and the extension line of the snail throat (5) is the snail tongue (4) angle, and the snail tongue (4) angle is ε, 0°<ε<90°.

11. The centrifugal fan according to any one of claims 7 to 10, characterized in that: Air enters from both sides of the centrifugal wind wheel (3), the air inlet length of the first side of the centrifugal wind wheel (3) is L1, and the air inlet length of the second side of the centrifugal wind wheel (3) is L2; ​​a motor bracket (101) is provided in the volute, the first side of the centrifugal wind wheel (3) is close to the motor bracket (101), and L1<L2.

12. The centrifugal fan according to claim 11, characterized in that: The volute comprises a left volute (1) and a right volute (2); the centrifugal wind wheel (3) is mounted on the fan shaft of the left volute (1); and the left volute (1) and the right volute (2) are butted against each other.

13. The centrifugal fan according to claim 12, characterized in that: In the axial direction, the gap between the centrifugal wind wheel (3) and the left volute (1) is a, and the gap between the centrifugal wind wheel (3) and the right volute (2) is b, where a≤b.

14. A device having a centrifugal fan, characterized in that: include: The centrifugal fan according to any one of claims 7 to 13.

15. The device having a centrifugal fan according to claim 14, characterized in that: The device with the centrifugal fan is a bladeless fan.

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