Blades, impellers and ventilation devices

Abstract

The application relates to a blade, an impeller and a ventilation device, the blade comprises a plurality of control surfaces arranged in layers along the height direction of the blade, the blade comprises an arc-shaped leading edge, the distance between the leading edge and the central axis of the impeller is an inner diameter of the blade, and the inner diameters of the plurality of control surfaces are different from each other. The impeller of the application changes the design of the blade along the height direction of the blade under the same hub groove structure, so that the leading edge of the blade is designed by using different control points, and the shape of the groove for accommodating the motor of the hub is matched, the air volume is increased, the aerodynamic noise is reduced, the power consumption is reduced, and the aerodynamic performance of the ventilation device is improved.

Description

Technical Field

[0001] This application relates to the field of household appliance technology, and more particularly to a blade, impeller and ventilation device. Background Technology

[0002] Impellers are common components in ventilation equipment, and their performance is mainly reflected in air volume and noise control. The impeller motor is typically mounted on a hub, requiring a groove in the hub to accommodate it. The diameter of this groove decreases along the height of the blades. After entering the suction surface of the blades, the airflow converges onto them. Because the blade shape remains unchanged along its height, the distance between the hub groove and the leading edge of the blades varies, affecting the impeller's aerodynamic performance and the airflow organization near the blades, making it difficult to achieve the impeller's full performance. Summary of the Invention

[0003] The purpose of this application is to provide a blade, impeller, and ventilation device, wherein the blade is matched with the groove shape of the impeller hub for accommodating a motor, which can increase air volume while reducing aerodynamic noise.

[0004] In a first aspect, embodiments of this application provide a blade applied to an impeller. The blade includes multiple control surfaces arranged in layers along its own height direction. The blade includes an arc-shaped leading edge, and the distance between the leading edge and the central axis of the impeller is the blade's inner diameter. The blade's inner diameters corresponding to the multiple control surfaces are all different.

[0005] In one possible implementation, the blade includes a bottom surface and a top surface that are positioned opposite each other along its height direction, and the number of layers containing the control surface near the bottom surface is less than the number of layers containing the control surface near the top surface, with a smooth transition connection between adjacent control surfaces.

[0006] In one possible implementation, when the impeller speed is a first speed and the air volume is a first air volume, the blade inner diameters corresponding to multiple control surfaces are determined according to the following control function:

[0007] y = -0.08275 x 3 + 1.57226 x 2 - 10.37529 x + 123.87879, where y represents the inner diameter of the blade and x represents the layer number of the control surface.

[0008] In one possible implementation, when the impeller speed is a second speed and the air volume is a second air volume, and the second speed is less than the first speed and the second air volume is less than the first air volume, the inner diameter of the blades corresponding to multiple control surfaces is determined according to the following control function:

[0009] y = -0.07277 x 3 + 1.30653 x 2 - 8.60253 x + 122.85758, where y represents the inner diameter of the blade and x represents the layer number of the control surface.

[0010] In one possible implementation, when the impeller speed is a third speed and the air volume is a third air volume, and the third speed is less than or equal to the second speed and the third air volume is less than the second air volume, the blade inner diameters corresponding to multiple control surfaces are determined according to the following control function:

[0011] y = -0.0723 x 2 - 1.7692 x + 117.94, where y represents the inner diameter of the blade and x represents the layer number of the control surface.

[0012] In one possible implementation, the maximum number of control surface layers is 11, and the blade inner diameter ranges from 90mm to 115mm.

[0013] In one possible implementation, the blade also includes a trailing edge and suction and pressure surfaces located between the leading and trailing edges and arranged opposite each other. The cross-sectional profile of the suction and pressure surfaces along a plane perpendicular to the meridional plane is a polynomial curve or an arc curve.

[0014] In one possible implementation, the polynomial curve includes a spline curve or a Bézier curve; the arc curve is any one of a single circular arc, a tangent double circular arc, and an airfoil arc.

[0015] Secondly, embodiments of this application also provide an impeller, comprising: a hub having a groove for accommodating a motor; a chassis disposed on the outer periphery of the hub; a front disc opposite to and coaxially disposed with respect to the chassis; and at least two blades as described above, disposed between the chassis and the front disc and spaced apart along the circumferential direction of the groove, wherein the inner diameter of the groove gradually decreases along the direction from the chassis to the front disc.

[0016] Thirdly, embodiments of this application provide a ventilation device, including: an impeller as described above; and a motor disposed within a groove in the hub of the impeller.

[0017] According to the blades, impellers, and ventilation equipment provided in the embodiments of this application, the blades include multiple control surfaces arranged in layers along their own height direction. Each blade includes an arc-shaped leading edge, and the distance between the leading edge and the central axis of the impeller is the blade's inner diameter. The inner diameters of the blades corresponding to the multiple control surfaces are all different. For the same groove in the hub used to accommodate the motor, by varying the design of the blades along their own height direction, the leading edge of the blades matches the shape of the grooves. This improves the airflow organization near the blades, enhances the aerodynamic performance of the impeller, increases airflow, reduces aerodynamic noise, lowers power consumption, and ultimately improves the aerodynamic performance of the ventilation equipment. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In addition, in the drawings, the same parts use the same reference numerals, and the drawings are not drawn to scale.

[0019] Figure 1 This illustration shows a three-dimensional structural diagram of an impeller along an angle provided in an embodiment of this application.

[0020] Figure 2 This illustration shows a three-dimensional structural diagram of the impeller provided in an embodiment of this application at another angle;

[0021] Figure 3 A top view schematic diagram of the impeller provided in an embodiment of this application is shown;

[0022] Figure 4 Show Figure 3 Cross-sectional view along direction AA;

[0023] Figure 5 This shows a projected view of the blade in the meridional plane provided in an embodiment of this application;

[0024] Figure 6 Show Figure 5 The diagram shows a top view of the blade structure.

[0025] Figure 7 Show Figure 5 The diagram shows the blade profile structure on different control surfaces;

[0026] Figure 8 Show Figure 5 The diagram shows a functional relationship between the inner diameter of the blade and the control surfaces of different layers.

[0027] Figure 9 Show Figure 5 The diagram shows another functional relationship between the inner diameter of the blade and the control surfaces of different layers.

[0028] Figure 10 Show Figure 5 This diagram illustrates another functional relationship between the inner diameter of the blade and the control surfaces of different layers.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Blade; CF, control surface; 11. Leading edge; 12. Trailing edge; 13. Bottom surface; 14. Top surface; 15. Suction surface; 16. Pressure surface;

[0031] 2. Wheel hub; 3. Chassis; 4. Front disc. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] Figure 1 This illustration shows a three-dimensional structural diagram of an impeller along an angle provided in an embodiment of this application. Figure 2 This illustration shows a three-dimensional structural diagram of the impeller provided in an embodiment of this application at another angle; Figure 3 A top view schematic diagram of the impeller provided in an embodiment of this application is shown; Figure 4 Show Figure 3 Cross-sectional view along direction AA.

[0034] like Figures 1 to 4 As shown in the embodiment of this application, an impeller includes blades 1, a hub 2, a chassis 3, and a front disc 4. The hub 2 has a groove 21 for accommodating a motor. The chassis 3 is disposed on the outer periphery of the hub 2. The front disc 4 is opposite to the chassis 3 and coaxially disposed. At least two blades 1 are disposed between the chassis 3 and the front disc 4 and spaced apart along the circumferential direction of the groove 21. The inner diameter of the groove 21 of the hub 2 gradually decreases from the chassis 3 to the front disc 4.

[0035] In related technologies, the inlet angle, outlet angle, and blade diameter ratio of blade 1 are generally controlled. However, along the height direction of blade 1, the diameter of the groove 21 of hub 2 decreases accordingly, while the shape of blade 1 remains unchanged along the height direction. This results in different distances between the groove 21 of hub 2 and blade 1, affecting the aerodynamic performance of the impeller and the airflow organization near the blade, making it difficult to fully utilize the impeller's performance. Research shows that the structure of groove 21 has a certain impact on the aerodynamic performance of the impeller, potentially reducing airflow by up to 20%, and correspondingly reducing noise levels.

[0036] To address the aforementioned issues, this application provides a blade 1 whose shape matches the groove 21 of the hub 2 for accommodating the motor, thereby increasing airflow while reducing aerodynamic noise.

[0037] Figure 5 This shows a projected view of the blade in the meridional plane provided in an embodiment of this application; Figure 6 Show Figure 5 The diagram shows a top view of the blade structure. Figure 7 Show Figure 5 The diagram shows the blade profile on different control surfaces.

[0038] In this article, the "meridian plane" refers to the plane passing through the central axis of the impeller. Figure 5 The image shown is a projection view of the blade on the meridional plane, which refers to the projection view of the blade on the meridional plane when the blade rotates around the central axis of the impeller to any point on the meridional plane and intersects with that meridional plane.

[0039] like Figures 5 to 7 As shown, this application embodiment provides a blade 1, which includes multiple control surfaces CF arranged in layers along its own height direction. The blade includes an arc-shaped leading edge 11. The distance between the leading edge 11 and the central axis of the impeller is the blade inner diameter. The blade inner diameters corresponding to the multiple control surfaces CF are different.

[0040] The leading edge 11 can be either an elliptical or circular arc surface to guide airflow. When the leading edge 11 is an elliptical arc surface, the blade inner diameter is the distance between the focal point of the leading edge 11 and the central axis of the impeller; when the leading edge 11 is a circular arc surface, the blade inner diameter is the distance between the center of the leading edge 11 and the central axis of the impeller. The control surface CF also includes a trailing edge 12 and a suction surface 15 and a pressure surface 16 located between the leading edge 11 and the trailing edge 12 and arranged opposite to each other. When the airflow drawn in axially from the impeller reaches the leading edge 11, it can flow towards the blade root towards the bottom surface 13, while a portion of the airflow enters the pressure surface 16 side and a portion enters the suction surface 15 side, thus converting the axial airflow into radial airflow.

[0041] Furthermore, impellers can generally be divided into forward-curved impellers and backward-curved impellers, distinguished by their inlet angle. An inlet angle greater than 90° is a backward-curved impeller, and an inlet angle less than 90° is a forward-curved impeller. In this embodiment, the inlet angle is a key parameter of the blade 1. By controlling the inner diameter of each control surface CF, the inlet angle corresponding to each control surface CF of the blade 1 is controlled accordingly, so that the inlet angle of the blade 1 adjusts with the change in the height of the blade 1. Simultaneously, the distance between the groove 21 and the leading edge 11 of the blade 1 is kept as consistent as possible, i.e., the shape of the blade 1 matches that of the groove 21. This improves the airflow organization near the blade 1, enhances the aerodynamic performance of the impeller, and increases airflow while reducing aerodynamic noise.

[0042] According to the blade 1 and impeller provided in the embodiments of this application, the blade 1 includes multiple control surfaces CF arranged in layers along its own height direction. The blade 1 includes an arc-shaped leading edge 11, and the distance between the center of the leading edge 11 and the central axis of the impeller is the inner diameter of the blade. The inner diameters of the blades corresponding to the multiple control surfaces CF are different. For the same groove 21 in the hub 2 used to accommodate the motor, by varying the design of the blade 1 along its own height direction, the shape of the leading edge 11 of the blade 1 matches that of the groove 21. This improves the airflow organization near the blade 1, enhances the aerodynamic performance of the impeller, increases airflow, reduces aerodynamic noise, and lowers power consumption.

[0043] The specific structure of the blade 1 provided in the embodiments of this application will be further described in detail below with reference to the accompanying drawings.

[0044] In some embodiments, the blade 1 includes a bottom surface 13 and a top surface 14 disposed opposite to each other along its own height direction, and the number of layers of the control surface CF near the bottom surface 13 is less than the number of layers of the control surface CF near the top surface 14, and two adjacent control surfaces CF are smoothly connected.

[0045] like Figure 5 As shown, blade 1 includes multiple control surfaces CF arranged in layers along its height direction, each control surface CF corresponding to a different blade inner diameter. Among them, along... Figure 5 The direction indicated by the middle arrow is the height direction of blade 1. Multiple control surfaces (CFs) can be evenly distributed along the height direction of blade 1, or non-uniformly distributed. For example, the distribution density of control surfaces (CFs) is higher in important areas along the height direction of blade 1, while the distribution density is lower in less important areas. Specifically, the area near the top surface 14 affects the intake air volume, and the area near the bottom surface 13 affects the exhaust air volume; these two areas are considered important, while the remaining areas are considered unimportant. This arrangement improves the airflow organization near blade 1 and enhances the aerodynamic performance of the impeller.

[0046] In addition, the two adjacent control surfaces CF are smoothly connected. When the airflow drawn in along the impeller inlet gathers and impacts the blade 1, it can reduce the impact between the airflow and the blade 1, reduce wind resistance, and reduce the degree of airflow turbulence.

[0047] Figure 8 Show Figure 5 The diagram shows a functional relationship between the inner diameter of the blade and the control surfaces of different layers.

[0048] like Figure 8 As shown, in some embodiments, when the impeller speed is a first speed and the air volume is a first air volume, the blade inner diameters corresponding to multiple control surfaces CF are determined according to the following control function:

[0049] y = -0.08275 x 3 + 1.57226 x 2 - 10.37529 x + 123.87879, (1)

[0050] Where y represents the inner diameter of the blade, and x represents the layer number where the control surface CF is located.

[0051] Optionally, the first rotational speed of the impeller is greater than 2500 revolutions per minute (rpm), and the first air volume is greater than 300 m³ / h. Under this condition, the air volume and air pressure are relatively high. As mentioned above, the number of layers where the control surface CF near the bottom surface 13 is located is less than the number of layers where the control surface CF near the top surface 14 is located. For example, when x=1, the inner diameter of the blade corresponding to the first layer control surface CF near the bottom surface 13 is taken according to formula (1), and thus,

[0052] y= -0.08275+ 1.57226 - 10.37529+ 123.87879=115mm.

[0053] Using this method, the blade inner diameter corresponding to each control surface CF can be calculated, and then the inlet angle and other blade parameters corresponding to each control surface CF can be calculated.

[0054] In some embodiments, the control surface CF further includes a trailing edge 12 and a suction surface 15 and a pressure surface 16 located between the leading edge 11 and the trailing edge 12 and disposed opposite to each other. The cross-sectional profile of the suction surface 15 and the pressure surface 16 along a plane perpendicular to the meridional plane is a polynomial curve or an arc curve. The airflow drawn in through the impeller inlet is rapidly separated at the leading edge 11. Part of the airflow enters the pressure surface 16 of the blade 1, causing the pressure surface 16 to generate positive pressure, while the other part flows to the suction surface 15, causing the suction surface 15 to generate negative pressure, thereby driving the blade 1 to rotate.

[0055] The suction surface 15 and the pressure surface 16 have a polynomial curve or an arc curve in the cross-sectional profile along the plane perpendicular to the meridional plane, which can ensure that the blade 1 has a good smooth effect, reduce wind resistance, reduce the degree of airflow turbulence, and improve the speed of airflow separation.

[0056] Furthermore, the polynomial curve can include, for example, but not limited to, spline curves or Bézier curves. The arc curve can be any of a single circular arc, a tangent double circular arc, and an airfoil arc. This configuration ensures that the blade 1 has a good smoothness and improves the speed of airflow separation. Here, "tangent double circular arc" refers to a circular arc located on one side of the leading edge 11 that is oriented in opposite directions to another circular arc and is tangent at the intersection point.

[0057] In other words, both the suction surface 15 and the pressure surface 16 can be any of the following in the radial direction from the leading edge 11 to the trailing edge 12: a single circular arc surface, a tangent double circular arc surface, and an airfoil arc surface. Since both the suction surface 15 and the pressure surface 16 have smooth curved surfaces, it is convenient to convert the airflow drawn in along the impeller axis into radial airflow that is thrown out from the outlet. Furthermore, the curvatures of the suction surface 15 and the pressure surface 16 can be the same or different.

[0058] Figure 9 Show Figure 5 This diagram illustrates another functional relationship between the inner diameter of the blade and the control surfaces of different layers.

[0059] like Figure 9 As shown, in some other embodiments, when the impeller speed is a second speed and the air volume is a second air volume, and the second speed is less than the first speed and the second air volume is less than the first air volume, the blade inner diameters corresponding to the multiple control surfaces CF are determined according to the following control function:

[0060] y = -0.07277 x 3 + 1.30653 x 2 - 8.60253 x + 122.85758, (2)

[0061] Where y represents the inner diameter of the blade, and x represents the layer number where the control surface CF is located.

[0062] Optionally, the second rotational speed of the impeller is 1800rpm-2500rpm (including the endpoint value), and the second air volume is 200 m³ / h~300 m³ / h (including the endpoint value). Under this condition, the air volume is high and the noise level is low. As mentioned above, the number of layers of the control surface CF near the bottom surface 13 is less than the number of layers of the control surface CF near the top surface 14. For example, when x=1, the inner diameter of the blade corresponding to the first layer control surface CF near the bottom surface 13 is taken according to formula (2), and thus,

[0063] y= -0.07277+1.30653- 8.60253+ 122.85758=115mm.

[0064] Using this method, the blade inner diameter corresponding to each control surface CF can be calculated, and then the inlet angle and other blade parameters corresponding to each control surface CF can be calculated.

[0065] Furthermore, the control surface CF also includes a trailing edge 12 and a suction surface 15 and a pressure surface 16 located between the leading edge 11 and the trailing edge 12 and disposed opposite to each other. The cross-sectional profile of the suction surface 15 and the pressure surface 16 along a plane perpendicular to the meridional plane is a polynomial curve or an arc curve. The polynomial curve may include, for example, but not limited to, spline curves or Bézier curves. The arc curve may be any of a single circular arc, a tangent double circular arc, and an airfoil arc.

[0066] Figure 10 Show Figure 5 This diagram illustrates another functional relationship between the inner diameter of the blade and the control surfaces of different layers.

[0067] like Figure 10 As shown, in some other embodiments, when the impeller speed is a third speed and the air volume is a third air volume, and the third speed is less than or equal to the second speed and the third air volume is less than the second air volume, the blade inner diameters corresponding to the multiple control surfaces CF are determined according to the following control function:

[0068] y = -0.0723 x 2 - 1.7692 x + 117.94, (3)

[0069] Where y represents the inner diameter of the blade, and x represents the layer number where the control surface CF is located.

[0070] Optionally, the third rotational speed of the impeller is less than 2200 rpm, and the third air volume is less than 200 m³ / h. Under this condition, the third rotational speed and the second rotational speed have a partially overlapping range, but the third air volume is less than the second air volume, that is, the air volume is smaller and the noise level is also lower. Setting the blade inner diameter in this way can improve the working efficiency of the impeller and reduce energy consumption. As mentioned above, the number of layers of the control surface CF near the bottom surface 13 is less than the number of layers of the control surface CF near the top surface 14. For example, when x=1, the blade inner diameter corresponding to the first layer control surface CF near the bottom surface 13 is taken according to formula (3), and we can obtain the value.

[0071] y= -0.0723- 1.7692+ 117.94=115mm.

[0072] Using this method, the blade inner diameter corresponding to each control surface CF can be calculated, and then the inlet angle and other blade parameters corresponding to each control surface CF can be calculated.

[0073] Furthermore, the control surface CF also includes a trailing edge 12 and a suction surface 15 and a pressure surface 16 located between the leading edge 11 and the trailing edge 12 and disposed opposite to each other. The cross-sectional profile of the suction surface 15 and the pressure surface 16 along a plane perpendicular to the meridional plane is a polynomial curve or an arc curve. The polynomial curve may include, for example, but not limited to, spline curves or Bézier curves. The arc curve may be any of a single circular arc, a tangent double circular arc, and an airfoil arc.

[0074] In some embodiments, under different operating conditions, the maximum number of layers of the control surface CF of blade 1 is 11, and the inner diameter of the blade ranges from 90mm to 115mm.

[0075] like Figure 5 As shown, blade 1 includes 11 control surfaces CF arranged at intervals along its height. The number of control surfaces CF near the bottom surface 13 is smaller, while the number of control surfaces CF near the top surface 14 is larger. The blade inner diameter corresponding to each control surface CF is different, with the largest blade inner diameter being 115 mm and the smallest being 90 mm.

[0076] Table 1 shows Figures 8 to 10 The three types of blades shown are blade inner diameter values ​​obtained by designing according to 11 control surfaces (CF). The blade inner diameter value corresponding to each control surface (CF) ranges from 90mm to 115mm.

[0077] In related technologies, the conventional model of blade 1 is that the inner diameter of the blade does not change along the height direction of blade 1. In this embodiment, the blade structure shown in the control function (1) in Table 1 is used as an example. The turbulent kinetic energy cloud diagram of the blade structure and the conventional model are simulated and analyzed at a speed of 2500 rpm. It can be concluded that the turbulent kinetic energy of the blade structure of the conventional model is greater than that of the blade structure shown in the control function (1). Turbulent kinetic energy can characterize noise. It can be seen that at a speed of 2500 rpm, the noise performance of blade 1 provided in this embodiment is improved compared with the conventional model, and the noise value is reduced by an average of about 10%.

[0078] It is understandable that the simulation analysis methods for control function (2) or control function (3) in Table 1 under different working conditions are similar, and will not be repeated here.

[0079] Table 2 shows Figures 8 to 10 The simulation analysis of airflow for the three types of blades at different rotational speeds is shown, and the airflow data is compared with that of conventional models using related technologies.

[0080] As can be seen from Table 2, the three blade structures provided in this application embodiment have a significant advantage in terms of air volume compared with the conventional model blade structure under the condition of no resistance applied, with an average increase in air volume of about 15% of the total air volume.

[0081] Table 1

[0082]

[0083] Table 2

[0084]

[0085] In addition, this application embodiment also provides a ventilation device, including an impeller and a motor as described above, with the motor disposed within the groove 21 of the impeller hub 2. Optionally, the ventilation device further includes a guide ring disposed on one side of the front disc 4 of the impeller, and the inner diameter of the guide ring is larger than the inner diameter of the blades but smaller than the inner diameter of the front disc 4. When the impeller rotates under the action of the motor, it draws airflow in along the axial direction of the guide ring, driving the blades 1 to perform work, and then discharges airflow radially along the impeller to achieve airflow delivery.

[0086] The ventilation device provided in this application embodiment includes an impeller as described above. The impeller includes a plurality of blades 1 spaced apart along the circumferential direction of the hub 2. Since each blade 1 includes a plurality of control surfaces CF arranged in layers along its own height direction, and each blade 1 includes an arc-shaped leading edge 11, the distance between the center of the leading edge 11 and the central axis of the impeller is the blade's inner diameter. The inner diameters of the blades corresponding to the plurality of control surfaces CF are all different. For the identical groove 21 in the hub 2 used to accommodate the motor, by varying the design of the blades 1 along their own height direction, the shape of the leading edge 11 of the blades 1 matches that of the groove 21. This improves the airflow organization near the blades 1, enhances the aerodynamic performance of the impeller, increases airflow, reduces aerodynamic noise, and lowers power consumption, thus improving the aerodynamic performance of the ventilation device.

[0087] This ventilation equipment can be an air conditioner. The purpose of the impeller is to allow airflow to pass through the heat exchanger, thereby exchanging heat between the airflow and the refrigerant in the heat exchanger to achieve the effect of cooling or heating.

[0088] It is understood that the ventilation equipment provided in this application embodiment is not limited to air conditioners, but can also be household ventilation equipment such as range hoods and dust collectors.

[0089] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0090] It should be readily understood that “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0091] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0092] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A blade used in the impeller of a centrifugal fan, characterized in that, The blade includes multiple control surfaces arranged in layers along its own height direction. The blade includes an arc-shaped leading edge. The distance between the leading edge and the central axis of the impeller is the inner diameter of the blade. The inner diameters of the blades corresponding to the multiple control surfaces are all different. The blade includes a bottom surface and a top surface that are arranged opposite each other along its own height direction, and the number of layers of the control surface near the bottom surface is less than the number of layers of the control surface near the top surface, and there is a smooth transition connection between two adjacent control surfaces; When the impeller rotates at a first speed and the airflow is a first airflow, the first speed is greater than 2500 revolutions per minute (rpm), and the first airflow is greater than 300 m³ / h. The inner diameter of the blades corresponding to the multiple control surfaces is determined according to the following control function: y = -0.08275 x 3 + 1.57226 x 2 - 10.37529 x + 123.87879, Where y represents the inner diameter of the blade in millimeters, and x represents the layer number of the control surface.

2. The blade according to claim 1, characterized in that, When the impeller rotates at a second rotational speed and the airflow is a second airflow, and the second rotational speed is less than the first rotational speed and the second airflow is less than the first airflow, the second rotational speed is 1800 rpm-2500 rpm and the second airflow is 200 m³ / h-300 m³ / h. The inner diameter of the blades corresponding to the multiple control surfaces is determined according to the following control function: y = -0.07277 x 3 + 1.30653 x 2 - 8.60253 x + 122.85758, Where y represents the inner diameter of the blade in millimeters, and x represents the layer number of the control surface.

3. The blade according to claim 2, characterized in that, When the impeller speed is a third speed and the air volume is a third air volume, and the third speed is less than or equal to the second speed and the third air volume is less than the second air volume, the third speed is less than 2200 rpm and the third air volume is less than 200 m³ / h, the inner diameter of the blades corresponding to the multiple control surfaces is determined according to the following control function: y = -0.0723 x 2 - 1.7692 x + 117.94, Where y represents the inner diameter of the blade in millimeters, and x represents the layer number of the control surface.

4. The blade according to any one of claims 1 to 3, characterized in that, The maximum number of layers of the control surface is 11, and the inner diameter of the blade ranges from 90mm to 115mm.

5. The blade according to claim 1, characterized in that, The blade also includes a trailing edge and a suction surface and a pressure surface located between the leading edge and the trailing edge and disposed opposite to each other. The cross-sectional profile of the suction surface and the pressure surface along a plane perpendicular to the meridional plane is a polynomial curve or an arc curve.

6. The blade according to claim 5, characterized in that, The polynomial curve includes a spline curve or a Bézier curve; the arc curve is any one of a single circular arc, a tangent double circular arc, and an airfoil arc.

7. An impeller, characterized in that, include: The hub has a recess to accommodate the motor; The chassis is located on the outer periphery of the wheel hub; The front plate is opposite to and coaxially arranged with the chassis; as well as At least two blades as described in any one of claims 1 to 6 are disposed between the chassis and the front disc and spaced apart along the circumferential direction of the groove, wherein the inner diameter of the groove gradually decreases along the direction from the chassis to the front disc.

8. A ventilation device, characterized in that, include: The impeller as described in claim 7; and The motor is located in the groove of the impeller hub.

Images