CN211259115U - Blade, multi-wing centrifugal fan blade and multi-wing centrifugal fan - Google Patents
Blade, multi-wing centrifugal fan blade and multi-wing centrifugal fan Download PDFInfo
- Publication number
- CN211259115U CN211259115U CN201921008413.9U CN201921008413U CN211259115U CN 211259115 U CN211259115 U CN 211259115U CN 201921008413 U CN201921008413 U CN 201921008413U CN 211259115 U CN211259115 U CN 211259115U
- Authority
- CN
- China
- Prior art keywords
- blade
- line
- centrifugal fan
- wing
- section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model provides a blade, the cross section of its blade body is the wing section profile, the cross section of blade body, contain leading edge line, tail edge line, suction line, pressure line four sections curve, the wing section of its constitution can restrain the flow separation of air current, eliminates the vortex in the blade way. The utility model also discloses an use multi-wing centrifugal fan blade and multi-wing centrifugal fan that has this blade, adopt the utility model discloses a multi-wing centrifugal fan has reduced blade surface pressure pulsation because of eliminated the vortex in the blade way to improved multi-wing centrifugal fan's air performance, reduced its noise.
Description
Technical Field
The invention relates to the technical field of ventilators, in particular to a blade, a multi-wing centrifugal fan blade and a multi-wing centrifugal fan.
Background
The multi-wing centrifugal fan is widely applied to household appliances such as air conditioners, air purifiers, range hoods, fans, refrigerators and the like due to the advantages of high pressure coefficient, large flow coefficient, compact structure and the like. The multi-blade centrifugal fan generally includes a volute, a multi-blade centrifugal fan blade, and a motor, wherein the multi-blade centrifugal fan blade is a core component of the multi-blade centrifugal fan, and the blades on the multi-blade centrifugal fan blade are key components determining the performance of the multi-blade centrifugal fan blade, and the performance of the blades directly affects the air performance and noise of the multi-blade centrifugal fan.
The fan blade of the multi-wing centrifugal fan has the characteristics of large number of blades, large curvature of the blades, short runner flow channel and the like, so that a large number of vortex flows possibly exist in the runner flow channel of the multi-wing centrifugal fan blade during working, the wall surface of the blade can generate large pressure pulsation, and obvious pneumatic noise is generated. In order to improve the noise of the multi-wing centrifugal fan, the prior art adopts a wing-shaped blade structure to improve the internal flow of the multi-wing centrifugal fan during the design of the blade, but because the existing various wing-shaped structures are developed according to the flight characteristics of an aircraft, the effect is not ideal when the existing various wing-shaped structures are directly used in the multi-wing centrifugal fan, and the requirements of the multi-wing centrifugal fan on the air performance and the noise are difficult to meet, therefore, the development of the blade suitable for the multi-wing centrifugal fan for household appliances and the multi-wing centrifugal fan is the research direction of science and technology workers in the industry.
Disclosure of Invention
In view of this, the present invention provides a blade, a multi-blade centrifugal fan blade, and a multi-blade centrifugal fan, in which the blade can suppress airflow separation, reduce the vortex inside the flow channel of the multi-blade centrifugal fan blade, and reduce the pressure pulsation generated on the wall surface of the blade, thereby reducing the noise level of the multi-blade centrifugal fan.
In order to achieve the above object, according to a first aspect of the present invention, there is provided a blade for constituting a blade group of a multi-blade centrifugal fan. The cross section of the blade is a profile of a wing type, and the cross section of the profile of the wing type is stretched along the longitudinal direction to obtain the blade.
The blade comprises a front edge part, a tail edge part, a pressure surface and a suction surface; the cross section of the blade comprises four sections of curves, namely a leading edge line, a trailing edge line, a suction line and a pressure line; the front edge line is an intersecting curve of the front edge part and the cross section of the blade; the tail edge line is an intersecting curve of the tail edge part of the blade and the cross section; the suction line is an intersecting curve of a suction surface and a cross section of the blade; the pressure line is the intersection curve of the pressure surface and the cross section of the blade.
Furthermore, the camber line of the airfoil profile of the cross section of the blade comprises a leading edge point B and a trailing edge point A, the line segment formed by connecting the leading edge point and the trailing edge point is AB, and the inlet angle β is designed according to the design parameters of the centrifugal fan blade1Outlet angle β2Outer diameter D2Inner diameter D1The length of the segment AB is L, and the value of L is:
wherein:
further, an x-y coordinate system is constructed by taking a leading edge point of a camber line of the cross section of the blade as an origin, wherein an x axis is an axis passing through the leading edge point and a trailing edge point, and the direction of the x axis is from the trailing edge point to the leading edge point; the y-axis is the axis passing through the leading edge point and perpendicular to the x-axis, and the airfoil profile curve equation of the cross section of the blade is as follows:
curve equation of pressure line: y = Ax5+Bx4+Cx3-0.3268033932x2-1.7756672162x +1.3279605664, wherein x ∈ (-0.01903L, L), A ∈ (-0.1, 0.1), B ∈ (-0.25, 0.25), C ∈ (-0.2, 0.2), and the curve equation of the suction line is y = Dx5+Ex4+Fx3-0.1186924530x2-1.1436763546x-0.6843217324, wherein x ∈ (0.05285L, L), D ∈ (-0.1, 0.15), E ∈ (-0.20, 0.25),F∈（-0.15,0.2）。
Furthermore, the front edge line of the cross section of the blade is an arc line connecting the pressure line and the suction line and is tangent to the pressure line and the suction line.
Furthermore, the tail edge line of the cross section of the blade is an arc line connecting the pressure line and the suction line, and the tail edge line is an arc line concentric with and of the same radius as the outer diameter of the centrifugal fan blade; the line length of the connecting line of the leading edge point B and the trailing edge point A of the camber line of the blade is L.
According to a second aspect of the present invention, there is provided a multi-blade centrifugal fan blade, comprising a wheel disc and a blade reinforcing ring which are coaxially arranged, wherein the multi-blade centrifugal fan blade comprises a plurality of blades provided by the present invention, the plurality of blades are arranged between the wheel disc and the reinforcing ring, and the plurality of blades are uniformly distributed along the circumferential direction of the wheel disc.
According to a third aspect of the present invention, a multi-blade centrifugal fan is provided, which includes a volute and a fan blade, wherein the multi-blade centrifugal fan includes the multi-blade centrifugal fan blade provided by the present invention, and the multi-blade centrifugal fan blade is disposed in the volute.
The invention has the beneficial effects that: by adopting the multi-wing centrifugal fan, the blades can inhibit the flow separation of airflow and eliminate the vortex in the blade channel, thereby reducing the surface pressure pulsation of the blades, further improving the air performance of the multi-wing centrifugal fan and reducing the noise level.
Drawings
The above and additional features and advantages of the present invention will be apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic view of a blade configuration according to a preferred embodiment of the present invention;
FIG. 2 is a schematic view of a camber line configuration of a blade in accordance with a preferred embodiment of the present invention;
FIG. 3 is a cross-sectional structural view of a preferred embodiment of the present invention, in the form of an airfoil profile;
FIG. 4 is a schematic structural view of a multi-blade centrifugal fan blade according to a preferred embodiment of the present invention;
FIG. 5 is a schematic structural view of a multi-blade centrifugal fan according to a preferred embodiment of the present invention;
in the drawings: 1 blade, 1.1 leading edge portion, 1.1.1 leading edge line, 1.2 suction surface, 1.2.1 suction line, 1.3 trailing edge portion, 1.3.1 trailing edge line, 1.4 pressure surface, 1.4.1 pressure line, 1.5 mean camber line, 2 multi-wing centrifugal fan blades, 2.1 wheel disc, 2.2 strengthening ring, 3 volute.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a blade is provided for forming a blade group of a multi-blade centrifugal fan blade. The blade comprises a blade body (1), the cross section of the blade body (1) is a profile of an airfoil, and the cross section of the profile of the airfoil is stretched along the longitudinal direction to obtain the blade body (1).
The blade body shown in fig. 1 comprises a front edge part (1.1), a tail edge part (1.3), a pressure surface (1.4) and a suction surface (1.2); the cross section of the blade body shown in fig. 2 comprises four curves, namely a leading edge line (1.1.1), a trailing edge line (1.3.1), a pressure line (1.4.1) and a suction line (1.2.1); the front edge line (1.1.1) is an intersection curve of the front edge part (1.1) of the blade body and the cross section; the tail edge line (1.3.1) is an intersection curve of the tail edge part (1.3) of the blade body and the cross section; the suction line (1.2.1) is an intersection curve of the suction surface (1.2) of the blade body and the cross section; the pressure line (1.4.1) is an intersection curve of the pressure surface (1.4) of the blade body and the cross section.
Further, as shown in FIG. 3, the mean camber line (1.5) of the airfoil profile of the cross section of the blade body is determined, and the design parameters of the centrifugal fan blade, namely the inlet angle β, are designed according to the airfoil mean camber line drawing method of the multi-blade centrifugal fan1=75 °, exit angle β2=165 °, outer diameter D2=350mm、Inner diameter D1=290 mm. The mean camber line contains leading edge point B and trailing edge point A, and the line segment that is formed by leading edge point B and trailing edge point A is AB, and its length is L:
wherein:
、
、
，
thus, the length L =34.59mm of the segment AB.
Further, an x-y coordinate system is constructed by taking a front edge point B of a mean camber line (1.5) of the cross section of the blade body as an origin, wherein an x axis is an axis passing through the front edge point B and a tail edge point A and is directed from the tail edge point A to the front edge point B; the y-axis is the axis passing through the leading edge point B and perpendicular to the x-axis, and the airfoil profile curve equation of the cross section of the blade body is: curve equation for pressure line (1.2.1): y = Ax5+Bx4+Cx3-0.3268033932x2-1.7756672162x +1.3279605664, wherein the curve equation of x ∈ (-0.01903L, L), A = -0.0000295350, B = -0.0028489161, C = -0.0222451139; suction line (1.4.1) is y = Dx5+Ex4+Fx3-0.1186924530x2-1.1436763546x-0.6843217324, wherein x ∈ (0.05285L, L), D =0.0000201550, E =0.0000654336, F = -0.0038392270.
Further, the leading edge line (1.1.1) of the cross section of the blade is a circular arc line connecting the pressure line (1.4.1) and the suction line (1.2.1) and is tangent to the pressure line (1.4.1) and the suction line (1.2.1).
Furthermore, the tail edge line (1.3.1) of the cross section of the blade is an arc line connecting the pressure line (1.4.1) and the suction line (1.2.1), and the tail edge line (1.3.1) is an arc line concentric with and of the same radius as the outer diameter of the centrifugal fan blade.
According to a second aspect of the present invention, as shown in fig. 4, a multi-blade centrifugal fan blade (2) is provided, where the multi-blade centrifugal fan blade (2) includes a wheel disc (2.1) and a blade reinforcing ring (2.2) which are coaxially disposed, the multi-blade centrifugal fan blade includes a plurality of blades (1) provided in the present invention, the plurality of blades are disposed between the wheel disc (2.1) and the reinforcing ring (2.2), and the plurality of blades (1) are uniformly distributed along a circumferential direction of the wheel disc (2.1).
According to a third aspect of the present invention, as shown in fig. 5, a multi-blade centrifugal fan is provided, which includes a volute (3) and a fan blade, wherein the multi-blade centrifugal fan includes the multi-blade centrifugal fan blade (2) provided by the present invention, and the multi-blade centrifugal fan blade (2) is disposed in the volute (3).
By adopting the centrifugal fan, the blades can inhibit the flow separation of air flow and eliminate vortex in the blade channel, thereby reducing the pressure pulsation on the surfaces of the blades, improving the air performance of the impeller and reducing the noise level.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (3)
1. A blade, characterized in that the cross section of the blade (1) is the profile of an airfoil, and the cross section of the airfoil profile is stretched along the longitudinal direction to obtain the blade (1); the cross section of the blade (1) comprises four sections of curves including a leading edge line (1.1.1), a trailing edge line (1.3.1), a suction line (1.2.1) and a pressure line (1.4.1), wherein the curve equation of the pressure line (1.4.1) is as follows: y = Ax5+Bx4+Cx3-0.3268033932x2-1.7756672162x +1.3279605664, x ∈ (-0.01903L, L), A ∈ (-0.1, 0.1), B ∈ (-0.25, 0.25), C ∈ (-0.2, 0.2), and the curve equation of the suction line (1.2.1) is y = Dx5+Ex4+Fx3-0.1186924530x2-1.1436763546x-0.6843217324，x∈（005285L, L), D ∈ (-0.1, 0.15), E ∈ (-0.20, 0.25) and F ∈ (-0.15, 0.2), wherein the leading edge line (1.1.1) is an arc line connecting the pressure line (1.4.1) and the suction line (1.2.1) and is tangent to the pressure line (1.4.1) and the suction line (1.2.1), the trailing edge line (1.3.1) is an arc line connecting the pressure line (1.4.1) and the suction line (1.2.1), the trailing edge line (1.3.1) is an arc line concentric with the outer diameter of the centrifugal fan blade and has the same radius, and the length of a connecting line between the leading edge point B and the trailing edge point A of the middle arc line (1.5) of the blade is L.
2. The multi-wing centrifugal fan blade is characterized in that the multi-wing centrifugal fan blade (2) comprises a plurality of blades in claim 1, the multi-wing centrifugal fan blade (2) comprises a wheel disc (2.1) and a blade reinforcing ring (2.2) which are coaxially arranged, the plurality of blades (1) are arranged between the wheel disc (2.1) and the reinforcing ring (2.2), and the plurality of blades are uniformly distributed along the circumferential direction of the wheel disc (2.1).
3. A multi-wing centrifugal fan, characterized in that it comprises a volute (3) and a multi-wing centrifugal fan blade (2) according to claim 2, said multi-wing centrifugal fan blade (2) being arranged inside said volute (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921008413.9U CN211259115U (en) | 2019-07-01 | 2019-07-01 | Blade, multi-wing centrifugal fan blade and multi-wing centrifugal fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921008413.9U CN211259115U (en) | 2019-07-01 | 2019-07-01 | Blade, multi-wing centrifugal fan blade and multi-wing centrifugal fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211259115U true CN211259115U (en) | 2020-08-14 |
Family
ID=71957268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921008413.9U Active CN211259115U (en) | 2019-07-01 | 2019-07-01 | Blade, multi-wing centrifugal fan blade and multi-wing centrifugal fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211259115U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113153812A (en) * | 2021-03-31 | 2021-07-23 | 西安交通大学 | C-type starting forward-bent multi-wing centrifugal fan impeller and preparation method thereof |
-
2019
- 2019-07-01 CN CN201921008413.9U patent/CN211259115U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113153812A (en) * | 2021-03-31 | 2021-07-23 | 西安交通大学 | C-type starting forward-bent multi-wing centrifugal fan impeller and preparation method thereof |
| CN113153812B (en) * | 2021-03-31 | 2022-08-16 | 西安交通大学 | C-type starting forward-bent multi-wing centrifugal fan impeller and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108386389B (en) | Centrifugal compressor diffuser structure with blades, casing and hub fused | |
| JP6493682B2 (en) | Centrifugal fan | |
| WO2021147593A1 (en) | Swirl-elimination structure, mixed flow fan assembly and air conditioner | |
| US9739287B2 (en) | Fan and motor assembly and method of assembling | |
| CN107076164B (en) | Turbofan and conditioner indoor unit | |
| US3363832A (en) | Fans | |
| CN211259115U (en) | Blade, multi-wing centrifugal fan blade and multi-wing centrifugal fan | |
| CN106939902B (en) | Energy-saving straight-wall front and rear disk variable-curvature curve element ternary impeller and centrifugal fan adopting same | |
| WO2021147595A1 (en) | Whirl eliminating structure, mixed-flow fan assembly and air conditioner | |
| CN105756981A (en) | Noise reduction fan wall for shell-free centrifugal fan | |
| CN112228400A (en) | Volute profile construction method, volute, air duct structure and range hood | |
| CN111878455A (en) | Centrifugal impeller, centrifugal fan and refrigeration equipment | |
| WO2020125128A1 (en) | Axial flow fan blade, ventilation device and air conditioner | |
| CN112352107A (en) | Arrangement of a centrifugal impeller of a fan for noise reduction | |
| US9945390B2 (en) | Centrifugal blower and method of assembling the same | |
| CN113217458B (en) | Impeller, fan system applying impeller and range hood | |
| CN109209989B (en) | Centrifugal fan and range hood | |
| CN110566503B (en) | Centrifugal fan blade, centrifugal fan, air conditioner and transportation means | |
| CN211009265U (en) | Impeller of centrifugal ventilator | |
| CN110185640B (en) | Centrifugal fan and household appliance | |
| KR880000522B1 (en) | Axial-flow fan | |
| CN113202814A (en) | Blade structure for bidirectional multi-wing centrifugal fan and multi-wing centrifugal fan impeller | |
| CN209724796U (en) | A kind of return channel blade | |
| CN108953222B (en) | Centrifugal impeller | |
| KR20120023319A (en) | A turbo fan for air conditioner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |