Wind wheel and air supply device

Abstract

The invention discloses a wind wheel and an air supply device.The wind wheel comprises a hub and a plurality of fan blades, the fan blades are annularly arranged on the periphery of the hub, each fan blade comprises a main body part and a blade top part, the blade top part is arranged on the side, away from the hub, of the main body part, the blade top part is provided with a plurality of turbulent flow waves distributed in the circumferential direction, and the turbulent flow waves are arranged on the side, away from the hub, of the main body part. The two opposite sides of the fan blade are a pressure face and a suction face respectively, and the turbulent flow waves sequentially protrude towards the suction face and the pressure face in the circumferential direction of the fan blade. According to the technical scheme, the operation noise of the air supply device is reduced, and the use experience of a user is improved.

Description

Technical Field

[0001] The present invention relates to the field of air supply equipment, and in particular to a wind wheel and an air supply device. Background Art

[0002] When the air supply device is working, the blades periodically cut the air, generating various vortices which will emit aerodynamic noise. In particular, the vortex at the blade top has the highest energy and the loudest noise, resulting in excessive operating noise of the air supply device, affecting the user experience. Summary of the invention

[0003] The main purpose of the present invention is to provide a wind wheel, aiming to reduce the operating noise of the air supply device to improve the user experience.

[0004] To achieve the above object, the wind wheel proposed in the present invention comprises:

[0005] Wheel hub; and

[0006] A plurality of fan blades are provided, wherein the plurality of fan blades are arranged around the periphery of the hub, the fan blades include a main body and a blade top, the blade top is arranged on a side of the main body away from the hub, the blade top is provided with a plurality of spoiler waves distributed along the circumferential direction, the opposite sides of the fan blade are a pressure surface and a suction surface respectively, and along the circumference of the fan blade, the spoiler waves bulge toward the suction surface and the pressure surface in sequence.

[0007] Optionally, the wind wheel is configured to rotate along a first direction, and corresponding to one of the wind blades, the heights of a plurality of the spoiler waves convex toward the suction surface decrease sequentially along the first direction.

[0008] Optionally, two adjacent spoiler waves are smoothly connected via a reverse waveform.

[0009] Optionally, the normal projection of the wind blade includes a characteristic band, and a plurality of the spoiler waves are formed in the characteristic band. The starting point of the characteristic band is taken as the origin, the radial direction of the hub is taken as the x-axis, and the axial direction of the hub is taken as the y-axis. In the positive direction of the x-axis, the protruding heights of the plurality of spoiler waves gradually decrease, and the negative direction of the y-axis is the same as the wind pressure direction. Then, the characteristic curve of the characteristic band is: Among them, A0, t, ω and are all constants.

[0010] Optionally, the value of ω satisfies the condition: 0<ω<π.

[0011] Optionally, The value of meets the condition:

[0012] Optionally, x max / t<2.

[0013] Optionally, 0 <A0<x max / 2.

[0014] Optionally, Wherein, D2 is the diameter of the wind wheel, and N is the number of the wind blades.

[0015] Optionally, A0=2, t=6, ω=2.5,

[0016] Optionally, the normal projection of the wind blade further includes arc segments connected to both ends of the characteristic wave band, and both arc segments are convex toward the suction surface.

[0017] Optionally, the top of the leaf is folded toward the suction surface relative to the main body.

[0018] Optionally, the folding angle of the leaf top is 10 degrees to 60 degrees.

[0019] Optionally, D1 is the diameter of the circle where the main body and the blade top are located, D2 is the diameter of the wind wheel, and the value of D1 / D2 is 80% to 95%.

[0020] Optionally, the wind wheel is an axial flow wind wheel, a centrifugal wind wheel or a mixed flow wind wheel.

[0021] The present invention also provides an air supply device, comprising the aforementioned wind wheel.

[0022] Optionally, the air supply device is an air conditioner or a fan.

[0023] In the technical solution of the present invention, by setting multiple spoiler waves, the shape of the blade top is close to the swimming shape of a ray, realizing the bionic design of the impeller. Since the blade top has multiple spoiler waves, the large blade top vortex originally formed at the blade top is broken up to form multiple small blade top vortices, which is equivalent to the noise source being dispersed. At the same time, the turbulent kinetic energy at the blade top is smaller, thereby making the running noise of the wind wheel smaller, thereby reducing the running noise of the air supply device to improve the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0025] Figure 1 This is a schematic structural diagram of an embodiment of a wind wheel of the present invention;

[0026] Figure 2 This is a structural schematic diagram of the normal projection of the wind wheel of the present invention;

[0027] Figure 3 It is a structural schematic diagram of the axial orthographic projection of the wind wheel of the present invention;

[0028] Figure 4 is a characteristic curve diagram of the wind wheel of the present invention;

[0029] Figure 5 This is a comparison diagram of the blade tip vortex of the wind wheel of the present invention and the blade tip vortex of the wind wheel of the related art. Figure 5 (a) corresponds to the wind wheel of the present invention, Figure 5 (b) corresponds to the wind wheel of the related art;

[0030] Figure 6 It is a comparison diagram of the wind volume and noise of the wind wheel of the present invention and the wind wheel of the related technology, wherein curve c corresponds to the wind wheel of the present invention, and curve d corresponds to the wind wheel of the related technology.

[0031] Description of Figure Numbers:

[0032] Label name Label name 100 Wheels 221 Spoiler Wave 200 Wind blade 222 Characteristic band 201 Suction side 223 Arc segment 202 Pressure surface K First Direction 210 Main body M Wind pressure direction 220 Leaf top

[0033] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] The invention provides a wind wheel.

[0039] In one embodiment of the present invention, Figure 1 and Figure 2 As shown, the wind wheel includes:

[0040] a wheel hub 100; and

[0041] The fan blades 200 are provided in plurality, and the plurality of the fan blades 200 are arranged around the periphery of the hub 100. The fan blade 200 includes a main body 210 and a blade top 220. The blade top 220 is arranged on a side of the main body 210 away from the hub 100. The blade top 220 is provided with a plurality of spoiler waves 221 distributed along the circumferential direction. The opposite sides of the fan blade 200 are a pressure surface 202 and a suction surface 201, respectively. Along the circumference of the fan blade 200, the spoiler waves 221 bulge toward the suction surface 201 and the pressure surface 202 in sequence.

[0042] It can be understood that in the air supply device, an air guide ring is generally provided outside the wind wheel. Since there is a certain gap between the air guide ring and the top of the wind blade 200, the blade tip vortex appears, which is one of the main causes of the wind wheel aerodynamic noise.

[0043] In the technical solution of the present invention, by setting a plurality of spoiler waves 221, the shape of the blade top 220 is close to the swimming shape of a ray, thereby realizing the bionic design of the impeller. Since the blade top 220 has a plurality of spoiler waves 221, a large blade top vortex originally formed at the blade top 220 is broken up to form a plurality of small blade top vortices, which is equivalent to the noise source being dispersed. At the same time, the turbulent kinetic energy of the blade top 220 is smaller, thereby making the operation noise of the wind wheel smaller, thereby being able to reduce the operation noise of the air supply device, so as to improve the user experience.

[0044] Further, in this embodiment, please refer to Figure 1 and Figure 2 , the wind wheel is configured to rotate along the first direction K, corresponding to one of the wind blades 200, and the height of the plurality of spoiler waves 221 protruding toward the suction surface is successively reduced along the first direction K. That is, for the plurality of spoiler waves 221 arranged on the suction surface of the wind blade 200, with the suction surface 201 of the wind blade 200 as a reference, the protruding height of the spoiler wave 221 close to the leading edge of the wind blade 200 is lower, and the protruding height of the spoiler wave 221 close to the trailing edge of the wind blade 200 is higher. Thus, by the plurality of spoiler waves 221 distributed in sequence, the blade tip vortex is progressively broken up, so that it is dispersed layer by layer in a plurality of spoiler waves 221, so as to avoid the vortex gathering near a spoiler wave 221, thereby effectively reducing the rotation noise of the wind wheel, which is conducive to ensuring the noise performance of the air supply device and improving the user experience. Of course, in other embodiments, the plurality of spoiler waves 221 can also be of the same protruding height, or other height arrangement schemes can be designed.

[0045] Furthermore, in the present embodiment, two adjacent spoiler waves 221 located on the same surface of the wind blade 200 are smoothly connected by a reverse waveform, that is, for the spoiler waves 221 arranged on the same surface of the wind blade 200, adjacent spoiler waves 221 are arranged at intervals. Since small vortices are formed at the spoiler waves 221 on the suction surface 201, such an arrangement can make the vortex more dispersed. In addition, the spoiler waves 221 located on both sides of the wind blade 200 are smoothly connected, which can enhance the breaking up effect of the spoiler waves 221 on the blade top vortex, thereby further reducing the operating noise of the wind wheel, thereby further reducing the operating noise of the air supply device, and improving the user experience.

[0046] Further, in this embodiment, please refer to Figure 2 and Figure 4, the normal projection of the wind blade 200 includes a characteristic band 222, and a plurality of the spoiler waves 221 are formed in the characteristic band 222. The starting point of the characteristic band 222 is taken as the origin, the radial direction of the hub 100 is taken as the x-axis, and the axial direction of the hub 100 is taken as the y-axis. In the positive direction of the x-axis, the protruding heights of the plurality of the spoiler waves 221 located on the suction surface 201 gradually decrease, and the negative direction of the y-axis is the same as the wind pressure direction M. Then, the characteristic curve of the characteristic band 222 is: Among them, A0, t, ω and are all constants. Among them, the characteristic band 222 is obtained by orthographic projection of the normal direction of the leading edge point of the blade root of the wind blade 200. In addition, it can also be orthographically projected from a certain position (such as the midpoint) of the blade top 220 to obtain the characteristic band 222. The characteristic band 222 formed according to the characteristic curve can meet the aforementioned technical solutions. For example, the spoiler wave 221 is convexly arranged toward the suction surface 201 and the pressure surface 202 in the thickness direction of the blade top 220. The heights of the multiple spoiler waves 221 convexly arranged toward the suction surface 201 are successively reduced in the first direction K of rotation of the wind blade 200, and the adjacent spoiler waves 221 located on the same surface are smoothly connected by reverse waveforms. By functionalizing the shape of the blade top 220 at the spoiler wave 221, it is possible to adjust A0, t, ω and These constant parameters are used to design a suitable characteristic band 222 to match the noise performance requirements of different air supply devices. In addition, the shape function of the blade top 220 at the spoiler wave 221 can also facilitate simulation in the development stage, and is also conducive to mass production, and can provide guidance when developing molds and product quality inspection.

[0047] Furthermore, in the present embodiment, the value of ω meets the condition: 0<ω<π. It can be understood that the period of the trigonometric function T=2π / ω. Corresponding to the characteristic curve of the present invention, the value of 2π / ω represents the distance between the peaks of two adjacent spoiler waves 221 located on the same surface of the wind blade 200. When ω is within the range of the present embodiment, there can be a sufficient distance between the two adjacent spoiler waves 221, which is beneficial to ensure the breaking up of the blade tip vortex. At the same time, the vortex can be dispersed more widely, thereby ensuring the weakening of the noise generated by the blade tip vortex, so as to ensure the noise performance of the air supply device.

[0048] Furthermore, in this embodiment, The value of meets the condition: Understandably, is the tangent value of the installation angle of the blade top 220, and the installation angle is the angle between the tangent of the boundary line between the blade top 220 and the main body 210 and the axial direction of the wind wheel. Within the scope of this embodiment, the airflow can act on the spoiler wave 221 at a suitable position, thereby ensuring that the spoiler wave 221 has a breaking-up effect on the blade tip vortex.

[0049] Furthermore, in this embodiment, x max / t<2, thus, the blade top 220 can have more than three spoiler waves 221 on one side of the suction surface 201, so that the blade tip vortex can be broken up into more than three, thereby ensuring the weakening effect of the noise generated by the blade tip vortex.

[0050] Furthermore, in this embodiment, 0 <A0<x max In this way, the spoiler wave 221 can have a sufficient height to ensure that the spoiler wave 221 breaks up the blade tip vortex, thereby ensuring the noise reduction effect of the spoiler wave 221 on the wind wheel.

[0051] Furthermore, in this embodiment, Wherein, D2 is the diameter of the wind wheel, and N is the number of the wind blades 200. That is, the total length of the characteristic wave band 222 is determined according to the specifications of the wind blades 200, so that the noise reduction effect of the spoiler wave 221 on the wind wheel can be guaranteed.

[0052] Furthermore, in this embodiment, if Figure 1 and Figure 2 As shown, the normal projection of the wind blade 200 also includes arc segments 223 connected to both ends of the characteristic wave band 222, and both arc segments 223 are convexly arranged toward the suction surface 201. In this way, the characteristic wave band 222 is at an appropriate position in the extension direction of the blade top 220, so that the characteristic wave band 222 is arranged corresponding to the position where the blade tip vortex is formed, so as to ensure the effect of breaking up the blade tip vortex.

[0053] Furthermore, in this embodiment, if Figure 1 As shown, the blade top 220 is folded toward the suction surface 201 compared to the main body 210. It can be understood that due to the gap between the air guide ring and the top of the fan blade 200, the airflow on the pressure surface 202 will flow back to the suction surface 201 through the gap, so that a shedding vortex is formed at the gap. The shedding of the vortex will produce an alternating force, which will cause the fan blade 200 and the guide member to vibrate structurally, making the operation noise of the fan blade 200 too loud. In this embodiment, by folding the blade top 220 and extending the blade top 220 in the direction away from the hub 100, the blade top 220 can effectively extend the reflux path of the airflow from the pressure surface 202 to the suction surface 201, inhibit the shedding of the vortex at the top of the blade, reduce the return airflow, and further reduce the operation noise of the wind wheel, which is conducive to improving the user experience.

[0054] Furthermore, in this embodiment, the folding angle of the blade top 220 is 10 to 60 degrees. The folding angle of the blade top 220 is the angle at which the blade top 220 is folded relative to the main body 210 at the boundary between the blade top 220 and the main body 210. It can be understood that if the folding angle is too large or too small, the shape of the wind blade 200 will be close to the state where the blade top 220 is not folded. In this embodiment, the folding angle of the blade top 220 is in the range of 10 to 60 degrees, which can effectively extend the reflux path of the airflow from the pressure surface 202 to the suction surface 201, so as to ensure the noise reduction effect on the wind wheel, thereby ensuring the user experience.

[0055] Furthermore, in this embodiment, if Figure 3 As shown, D1 is the diameter of the circumference of the junction of the main body 210 and the blade top 220, D2 is the diameter of the wind wheel, and the value of D1 / D2 is 80% to 95%. In this way, the spoiler wave 221 can avoid the part of the wind blade 200 that does the most work to ensure the working performance of the wind wheel. At the same time, the spoiler wave 221 can have a sufficient extension in the radial direction of the wind wheel to ensure the noise reduction effect of the spoiler wave 221 on the wind wheel.

[0056] Furthermore, the technical solution of the present invention can be used on a variety of wind wheels, for example, an axial flow wind wheel, a centrifugal wind wheel or a mixed flow wind wheel. That is, in the wind wheel, the blades 200 can be connected to the hub 100, or can be arranged in a spacer ring around the circumference of the hub 100. Among them, when the technical solution of the present invention is applied to a centrifugal wind wheel or a mixed flow wind wheel, the noise reduction effect of the wind wheel with a large angle of attack is better.

[0057] In one embodiment, A0=2, t=6, ω=2.5, That is, the characteristic function is: This characteristic function has high universality and can reduce noise for most wind turbines. The characteristic band 222 is constructed with this characteristic function. The characteristic band 222 can have a suitable number of spoiler waves 221, and the spoiler waves 221 can have a suitable height. There can be enough spacing between adjacent spoiler waves 221 on the same surface. The installation angle of the top 220 of the blade can also meet the requirements of the spoiler waves 221 and the airflow. Under this parameter condition, the blade tip vortex of the wind blade 200 is simulated. Please refer to Figure 5 (b) In the related art, the blade tip of the fan blade 200 is not provided with a turbulent wave 221, and a large blade tip vortex is formed at the blade tip of the fan blade 200. In most positions near the leading edge of the fan blade 200, the turbulent kinetic energy of the blade tip vortex is in the range of 0.8 to 1.2. In the present invention, please refer to Figure 5(a), the blade tip vortex is broken into three small vortices at the three turbulence waves 221 at the top 220 of the blade 200, and only the turbulence kinetic energy of the blade tip vortex at the turbulence wave 221 near the leading edge of the blade 200 reaches the range of 0.8 to 1.2, while the turbulence kinetic energy at most locations is in the range of 0 to 0.4. In addition, the wind volume and noise of the blade 200 are simulated and calculated, such as Figure 6 As shown, curve c corresponds to the wind wheel of the present invention, and curve d corresponds to the wind wheel of the related art. It can be concluded that under the same wind volume, the noise of the wind wheel of the present invention is reduced by 1.5dB year-on-year.

[0058] The present invention also provides an air supply device, which includes a wind wheel. The specific structure of the wind wheel refers to the above embodiment. Since the air supply device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. The air supply device can be an air conditioner, a fan, a fresh air device, a dehumidifier, an air purifier, etc. Among them, in a split air conditioner, the wind wheel can be applied to both the outdoor unit and the indoor unit.

[0059] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A wind wheel, characterized in that: include: Wheel hub; as well as A plurality of fan blades are provided, wherein the plurality of fan blades are arranged around the periphery of the hub, the fan blades include a main body and a blade top, the blade top is arranged on a side of the main body away from the hub, the blade top is provided with a plurality of spoiler waves distributed along the circumferential direction, the opposite sides of the fan blade are a pressure surface and a suction surface respectively, and along the circumference of the fan blade, the spoiler waves bulge toward the suction surface and the pressure surface in sequence.

2. The wind wheel according to claim 1, characterized in that: The wind wheel is configured to rotate along a first direction. Corresponding to one of the wind blades, the heights of a plurality of the spoiler waves protruding toward the suction surface decrease sequentially along the first direction.

3. The wind wheel according to claim 2, characterized in that: Two adjacent spoiler waves are smoothly connected via reverse waveforms.

4. The wind wheel according to claim 3, characterized in that: The normal projection of the wind blade includes a characteristic wave band, and a plurality of the spoiler waves are formed in the characteristic wave band. The starting point of the characteristic wave band is taken as the origin, the radial direction of the hub is taken as the x-axis, and the axial direction of the hub is taken as the y-axis. In the positive direction of the x-axis, the protruding heights of the plurality of spoiler waves gradually decrease, and the negative direction of the y-axis is the same as the wind pressure direction. Then, the characteristic curve of the characteristic wave band is: Among them, A0, t, ω and are all constants.

5. The wind wheel according to claim 4, characterized in that: The value of ω meets the conditions: 0<ω<π; and / or, The value of meets the condition: and / or, x max / t<2; and / or, 0 <A0<x max / 2; and / or, Wherein, D2 is the diameter of the wind wheel, and N is the number of the wind blades.

6. The wind wheel according to claim 5, characterized in that: A0=2,t=6,ω=2.5, 7. The wind wheel according to claim 4, characterized in that: The normal projection of the wind blade also includes arc segments connected to the two ends of the characteristic wave band, and both of the arc segments are convex toward the suction surface.

8. The wind wheel according to claim 1, characterized in that: The top of the blade is folded toward the suction surface relative to the main body.

9. The wind wheel according to claim 8, characterized in that: The folding angle of the leaf top is 10 degrees to 60 degrees.

10. The wind wheel according to claim 1, characterized in that: D1 is the diameter of the circumference of the junction between the main body and the blade top, D2 is the diameter of the wind wheel, and the value of D1 / D2 is 80% to 95%.

11. The wind wheel according to any one of claims 1 to 10, characterized in that: The wind wheel is an axial flow wind wheel, a centrifugal wind wheel or a mixed flow wind wheel.

12. An air supply device, characterized in that: The wind wheel comprises the wind wheel described in any one of claims 1 to 11.

13. The air supply device according to claim 12, characterized in that: The air supply device is an air conditioner or a fan.

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