Wind wheel and wind outlet device

Abstract

The wind wheel and air outlet device provided by the present invention include: a hub, a connecting portion is provided in the middle, the hub is suitable for connecting to an external power part through the connecting portion, and rotates with the connecting portion as the axis under the drive of the power part; a plurality of blades are connected to the hub and distributed along the circumference of the hub, at least a plurality of protrusions are provided on the windward surface of the blade, the protrusions are arranged at intervals and are concentrically arranged with the connecting portion as the center of the circle. The protrusions can play a role in guiding the wind on the windward surface of the blade, and can effectively change the turbulent structure of the near-wall area of ​​the blade, improve the chaotic vortex, weaken the strength of the counter-rotating vortex pairs, and reduce the rupture caused by mutual collision and abnormal separation between vortices, thereby reducing the intensity of turbulence and pulsating pressure, suppressing the medium and high frequency noise of the wind wheel, and finally reducing the noise of the overall wind wheel.

Description

Technical Field

[0001] The present invention relates to the technical field of fans, and in particular to a wind wheel and a wind outlet device. Background Art

[0002] Nowadays, various air outlet devices such as fans, air conditioners, and air purifiers are widely used in daily life. However, as an important component of the air outlet device, the wind wheel produces a certain degree of noise due to its own structural problems while efficiently discharging air.

[0003] The main method for reducing wind wheel noise at present is to add a sound insulation structure in the environment around the wind wheel. However, the sound insulation structure is expensive on the one hand, and reduces the utilization efficiency of the internal space of the air outlet device on the other hand, and increases the volume of the air outlet device. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problems of high cost of wind wheel noise reduction method in the prior art and low space utilization of the air outlet device provided with the wind wheel, thereby providing a wind wheel and an air outlet device.

[0005] The present invention provides a wind wheel, comprising: a hub, a connecting portion is arranged in the middle, suitable for connecting an external power part; a plurality of blades are connected to the hub and distributed along the circumference of the hub, at least a plurality of protrusions are arranged on the wind receiving surface of the blades, the protrusions are arranged at intervals from each other, and are concentrically arranged with the connecting portion as the center of the circle.

[0006] The side edges of both sides of the blade are provided with sawtooth structures.

[0007] The sawtooth structure comprises a plurality of evenly spaced recessed portions, wherein the recessed portions are concavely arranged along the circumference of the blade, and the raised portions extend to the side edges of both sides of the blade, and the recessed portions are correspondingly arranged between at least two of the raised portions.

[0008] Adjacent protrusions are evenly arranged along the wind receiving surface.

[0009] The radial thickness of the raised portion is C, and the spacing between adjacent raised portions is E, then 1≤E / C≤5.

[0010] 0.05mm≤C≤5mm.

[0011] At least part of the protrusion is arranged in an inverted V shape.

[0012] At least part of the protrusion is arranged to protrude in an inverted U shape and is arranged on the inner side of the inverted V-shaped protrusion facing the connecting portion.

[0013] The protrusion heights of the protrusions along the wind receiving surface are equal.

[0014] The present invention provides a wind outlet device, comprising the above-mentioned wind wheel.

[0015] The technical solution of the present invention has the following advantages:

[0016] 1. The wind wheel provided by the present invention comprises: a hub, a connecting portion is arranged in the middle, the hub is suitable for connecting to an external power component through the connecting portion, and rotates with the connecting portion as the axis under the drive of the power component; a plurality of blades are connected to the hub and distributed along the circumference of the hub, at least a plurality of protrusions are arranged on the wind receiving surface of the blades, the protrusions are arranged at intervals from each other, and are concentrically arranged with the connecting portion as the center of the circle.

[0017] The aerodynamic noise of fans, especially axial flow fans, is mainly caused by the pulsation of blades when wind blows through. Its noise spectrum is mainly composed of wide-band eddy current noise and discrete-frequency rotation noise. The fan is a discrete spectrum in the low-frequency part, with rotation noise as the main noise source. As the frequency increases, it gradually transitions to a continuous spectrum, with wide-band eddy current noise as the main noise source.

[0018] By arranging a plurality of protrusions on the blades, spacing them apart and concentrically arranged with the connecting portion as the center, when the wind wheel is connected to the power component and rotates with the connecting portion as the axis under the drive of the power component, the protrusions can play a wind-guiding role on the windward surface of the blades, and can effectively change the turbulent structure of the near-wall area of ​​the blades, improve the chaotic vortex, weaken the strength of the counter-rotating vortex pairs, and reduce the rupture caused by mutual collision and abnormal separation between vortices, thereby reducing the intensity of turbulence and pulsating pressure, suppressing the medium and high frequency noise of the wind wheel, and ultimately reducing the noise of the entire wind wheel. This arrangement effectively overcomes the problems of high cost of wind wheel noise reduction methods in the prior art and low space utilization of the air outlet device provided with the wind wheel.

[0019] 2. The wind wheel provided by the present invention has sawtooth structures on both side edges of the blades.

[0020] The serration structure set on the side edges of the blades can, on the one hand, reduce the area of ​​the boundary layer at the side edge position, thereby reducing the pulsation force and tail vortex; on the other hand, the serrations act as vortex generators, dividing the strong concentrated vortex wind into a number of small vortices, thereby reducing the turbulence intensity of the boundary layer, improving the turbulence conditions of the boundary layer, and enhancing the viscous dissipation effect, thereby reducing the turbulence intensity and pulsation pressure, and ultimately reducing the noise of the axial flow fan.

[0021] 3. The wind wheel provided by the present invention has a serrated structure comprising a plurality of evenly spaced recessed portions, wherein the recessed portions are concavely arranged along the circumference of the blade, and the raised portions extend to the side edges of both sides of the blade, and the recessed portions are correspondingly arranged between at least two of the raised portions.

[0022] The recessed portion is arranged between the raised portions, which facilitates guiding the airflow to the recessed portion, facilitates dividing the concentrated vortex wind into a plurality of small vortices, reduces the turbulence intensity of the boundary layer, and improves the turbulence condition of the boundary layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of the structure of a wind wheel provided in an embodiment of the present invention;

[0025] Figure 2 for Figure 1 A schematic cross-sectional side view of a blade of a wind wheel is shown;

[0026] Figure 3 for Figure 1 A schematic diagram of flow guidance of the blades of the wind wheel shown;

[0027] Description of reference numerals:

[0028] 1-hub; 11-connecting part; 2-blade; 21-raised part; 22-recessed part. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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.

[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] like Figure 1 - Figure 3 As shown, the present invention provides a wind wheel, comprising a hub 1 and a plurality of blades 2.

[0034] The hub 1 is set in a disc shape, and a connecting portion 11 is set in the middle. In this embodiment, the connecting portion 11 is an axial hole, and can also be a structure such as an axial groove, which is used to connect an external power part, which is specifically a driving motor; the blades 2 are connected to the edge of the hub 1 and are evenly distributed along the circumference of the hub 1. The number of blades 2 is not limited and can be adaptively adjusted as needed. In this embodiment, the wind-receiving surface of the blade 2, that is, the positive pressure surface of the driving airflow, is evenly and smoothly set, and a plurality of protrusions 21 are set thereon. The protrusions 21 are in the shape of arc strips, are arranged at intervals from each other, and are concentrically arranged with the connecting portion 11 as the center of the circle. As a convertible embodiment, the protrusions 21 can also be set on the leeward side of the blade 2.

[0035] The aerodynamic noise of fans, especially axial flow fans, is mainly caused by the pulsation of blades 2 when wind blows through. Its noise spectrum is mainly composed of wide-band eddy current noise and discrete-frequency rotation noise. The fan is a discrete spectrum in the low-frequency part, with rotation noise as the main noise source. As the frequency increases, it gradually transitions to a continuous spectrum, with wide-band eddy current noise as the main noise source.

[0036] By arranging a plurality of protrusions 21 on the blade 2, so that they are spaced apart from each other and are concentrically arranged with the connecting portion 11 as the center, when the wind wheel is connected to the power component and rotates with the connecting portion 11 as the axis under the drive of the power component, the protrusion 21 can play a wind-guiding role on the windward surface of the blade 2, and can effectively change the turbulent structure of the near-wall area of ​​the blade 2, improve the chaotic vortex, weaken the strength of the counter-rotating vortex pairs, and reduce the rupture caused by mutual collision and abnormal separation between vortices, thereby reducing the intensity and pulsating pressure of the turbulence, suppressing the medium and high-frequency noise of the wind wheel, and ultimately reducing the noise of the overall wind wheel.

[0037] In this embodiment, sawtooth structures are provided on both side edges of the blade 2. As a changeable implementation, the blade 2 may be provided with a sawtooth structure only on the front side edge along the rotation direction.

[0038] The serration structure arranged on the side edges of the blade 2 can, on the one hand, reduce the area of ​​the boundary layer at the side edge position, thereby reducing the pulsation force and the tail vortex; on the other hand, the serration acts as a vortex generator, which disperses the strong concentrated vortex wind into a number of small vortices, thereby reducing the turbulence intensity of the boundary layer, improving the turbulence conditions of the boundary layer, and enhancing the viscous dissipation effect, thereby reducing the turbulence intensity and pulsation pressure, and ultimately reducing the noise of the axial flow fan.

[0039] The sawtooth structure includes a plurality of evenly spaced recessed portions 22, the recessed portions 22 are concavely arranged along the circumference of the blade 2, the raised portions 21 extend to the side edges of both sides of the blade 2, and the recessed portions 22 are correspondingly arranged between at least two raised portions 21. The recessed portions 22 are arranged between the raised portions 21, so that it is convenient to guide the airflow to the position of the recessed portions 22, and it is convenient to separate the concentrated vortex wind into a plurality of small vortices, reduce the turbulence intensity of the boundary layer, and improve the turbulence condition of the boundary layer.

[0040] In this embodiment, the protrusions 21 are evenly arranged along the wind receiving surface, and the protrusions 21 arranged on the wind receiving surface are arranged at equal intervals. This arrangement ensures the uniformity of the flow diversion of the protrusions 21, effectively changes the turbulent structure at each position, reduces the intensity and pulsating pressure of the turbulence, and suppresses the medium and high frequency noise of the wind wheel. As a convertible embodiment, the spacing between the protrusions 21 can be evenly and gradually set according to the direction close to the connecting portion 11.

[0041] The radial thickness of the protrusion 21 is set to C, and the spacing between adjacent protrusions 21 is set to E. In this embodiment, the radial thickness of the protrusion 21 and the spacing between adjacent protrusions 21 are measured based on the connection position between the protrusion 21 and the surface of the blade 2. Specifically, 1≤E / C≤5, preferably E / C=5. Further, 0.05mm≤C≤5mm, preferably, C=3mm.

[0042] In this embodiment, the cross section of part of the raised portion 21 is triangular, and the tip is inverted V-shaped and protruding. The cross section of another part of the raised portion 21 is shield-shaped, and the tip is inverted U-shaped and protruding. This part of the raised portion 21 is arranged on the inner side of the raised portion 21 with the inverted V-shaped tip facing the connecting portion 11. As a convertible embodiment, the raised portions 21 can all be triangular or shield-shaped or other shapes. In this embodiment, the wind wheel noise volume under different conditions is shown in the following table:

[0043]

[0044]

[0045] In addition, in this embodiment, the protrusion heights of each protrusion 21 along the windward surface are equal, and the protrusions 21 are evenly arranged along the windward surface, which further ensures the uniformity of the flow guidance of the protrusions 21, effectively changes the turbulent structure at each position, reduces the intensity and pulsating pressure of the turbulence, and suppresses the medium and high frequency noise of the wind wheel. As a convertible embodiment, the cross-sectional shape of the protrusion 21 can be adjusted accordingly as needed, and can be rectangular, etc.

[0046] The present embodiment provides an air outlet device, which may specifically be an air conditioner, an axial flow fan, a fan, etc. In the present embodiment, it is specifically an air purifier, including the above-mentioned wind wheel and a driving motor connected to the wind wheel.

[0047] Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of the invention.

Claims

1. A wind wheel, characterized in that: include: The hub (1) has a connecting portion (11) disposed in the middle thereof, which is suitable for connecting to an external power component; A plurality of blades (2) are connected to the hub (1) and are distributed along the circumference of the hub (1); at least a plurality of raised portions (21) are arranged on the wind-receiving surface of the blade (2); the raised portions (21) are arranged at intervals from each other and are arranged concentrically with the connecting portion (11) as the center of the circle; side edges on both sides of the blade (2) are provided with a sawtooth structure; the sawtooth structure comprises a plurality of recessed portions (22) arranged at even intervals; the recessed portions (22) are arranged inwardly concavely along the circumference of the blade (2); the raised portions (21) extend to the side edges on both sides of the blade (2); and the recessed portions (22) are correspondingly arranged between at least two of the raised portions (21).

2. The wind wheel according to claim 1, characterized in that: Adjacent protrusions (21) are evenly arranged along the wind receiving surface.

3. The wind wheel according to claim 2, characterized in that: The radial thickness of the protrusion (21) is C, and the spacing between adjacent protrusions (21) is E, then 1≤E / C≤5.

4. The wind wheel according to claim 3, characterized in that: 0.05mm≤C≤5mm.

5. The wind wheel according to claim 3 or 4, characterized in that: At least part of the protrusion (21) is arranged to protrude in an inverted V shape.

6. The wind wheel according to claim 5, characterized in that: At least part of the protruding portion (21) is arranged in an inverted U-shape and is arranged on the inner side of the inverted V-shaped protruding portion (21) facing the connecting portion (11).

7. The wind wheel according to claim 2, characterized in that: The protrusion heights of the protrusions (21) along the wind receiving surface are equal.

8. An air outlet device, characterized in that: It comprises the wind wheel as described in any one of claims 1 to 7.

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