CN215595989U - Centrifugal fan blade - Google Patents
Centrifugal fan blade Download PDFInfo
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- CN215595989U CN215595989U CN202120779821.5U CN202120779821U CN215595989U CN 215595989 U CN215595989 U CN 215595989U CN 202120779821 U CN202120779821 U CN 202120779821U CN 215595989 U CN215595989 U CN 215595989U
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- pressure surface
- centrifugal fan
- molded line
- blade
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Abstract
The utility model discloses a centrifugal fan blade which comprises a pressure surface molded line and a back pressure surface molded line, wherein the pressure surface molded line consists of an arc A and a line segment B, the arc A is tangent to the line segment B, and the maximum relative curvature of the pressure surface molded line is F1＝H1/L1，L1Is the chord length of the arc A, H1Is the maximum camber of arc a; the back pressure surface profile consists of an arc C, and the maximum relative curvature of the pressure surface profile is F2＝H2/L2，L2Is the chord length of the circular arc C, H2The maximum camber of the arc C; wherein, F2Greater than F1The separation and development of boundary layers on the surfaces of traditional centrifugal blades are improved, so that the airflow resistance in a blade channel is reduced, the eddy noise in the blade channel is improved, the wake jet flow formed by the blades at the trailing edge reduces the impact strength on the volute tongue and the volute casing, improves the sound pressure pulsation strength on the surfaces of the volute tongue and the volute casing, and effectively reduces the aerodynamic noise of a fan.
Description
Technical Field
The utility model relates to the technical field of centrifugal fans, in particular to a centrifugal fan blade.
Background
The centrifugal fan is widely introduced due to the advantages of large suction force, low noise, compact structure and the like, and the conventional blades generate high-intensity impact on a volute system, generate pneumatic noise and reduce use experience.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides a centrifugal fan blade which comprises a pressure surface molded line and a back pressure surface molded line, wherein the pressure surface molded line consists of an arc A and a line segment B, and the maximum relative curvature of the pressure surface molded line is F1＝H1/L1，L1The chord length of the circular arc A is H1, and the maximum curvature of the circular arc A is H1; the back pressure surface molded line consists of an arc C, and the maximum relative curvature of the pressure surface molded line is F2＝H2/L2，L2Is the chord length of the circular arc C, H2Is the maximum camber of the arc C; wherein, F2Greater than F1。
According to some embodiments of the utility model, the H1Position of (a) and the H2Are not coincident.
According to some embodiments of the utility model, the arc a intersects the line segment B at point O; point P is at the blade trailing edge end point of arc C and PO is perpendicular to segment B.
According to some embodiments of the utility model, the arc a is tangent to the line segment B.
According to some embodiments of the utility model, the inlet setting angle range of the blade is 63 ≦ β1≤75°。
The embodiment of the utility model has at least the following beneficial effects:
1) the separation and development of boundary layers on the surfaces of traditional centrifugal blades are improved, so that the airflow resistance in a blade path is reduced, the eddy noise in the blade path is improved, the wake jet flow formed by the blades at the trailing edge reduces the impact strength on the volute tongue and the volute casing, improves the sound pressure pulsation strength on the surfaces of the volute tongue and the volute casing, and effectively reduces the aerodynamic noise of a fan.
2) The centrifugal fan can overcome the effect of pressure difference when airflow flows out of the blades, reduce the eddy of the blade flow channel, reduce the impact and separation of the airflow in the centrifugal fan, improve the flow field distribution of the airflow in the centrifugal fan and improve the work doing capability of the impeller.
3) The linear section is arranged at the molded line outlet of the pressure surface of the blade, so that the boundary layer separation phenomenon generated when air flow enters a blade channel can be effectively relieved, and the effect of inhibiting the generation of the horseshoe vortex is achieved. Meanwhile, the impact at the outlet is reduced, and the pressure resistance of the wind wheel is improved.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is an overall schematic diagram of an embodiment of the present invention;
FIG. 2 is a schematic view of a blade profile structure according to an embodiment of the present invention;
FIG. 3 is a schematic view of the inlet stagger angle of a blade profile configuration according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
Referring to fig. 1 to 3, a centrifugal fan blade includes a pressure surface profile 100 and a back pressure surface profile 200, the pressure surface profile 100 is composed of an arc a110 and a line segment B120, the arc a110 is tangent to the line segment B120, and the maximum relative camber of the pressure surface profile 100 is F1＝H1/L1，L1Is the chord length of the arc A110, H1Maximum camber of arc a 110; the back-pressure profile 200 is composed of an arc C210, and the maximum relative curvature of the pressure profile 100 is F2＝H2/L2，L2Is the chord length of the circular arc C210, H2Maximum camber of arc C210; wherein, F2Greater than F1The separation and development of boundary layers on the surfaces of traditional centrifugal blades are improved, so that the airflow resistance in a blade channel is reduced, the eddy noise in the blade channel is improved, the wake jet flow formed by the blades at the trailing edge reduces the impact strength on the volute tongue and the volute casing, improves the sound pressure pulsation strength on the surfaces of the volute tongue and the volute casing, and effectively reduces the aerodynamic noise of a fan.
H1Position of (A) and (H)2Are not coincident.
The arc A110 intersects the segment B120 at point O; the point P is on the end point of the tail edge of the blade of the circular arc C210, and the PO is vertical to the line segment B120, so that the effect of pressure difference can be overcome when the airflow flows out of the blade, the vortex of the flow channel of the blade can be reduced, the impact and the separation of the airflow in the centrifugal fan are reduced, the flow field distribution of the airflow in the centrifugal fan is improved, and the work capacity of the impeller is improved.
The inlet installation angle range of the blade 101 is not less than 63 degrees and not more than beta1The angle is less than or equal to 75 degrees, the straight line section is arranged at the outlet of the molded line 100 of the pressure surface of the blade, the boundary layer separation phenomenon generated when the airflow enters the blade channel can be effectively relieved, and the effect of inhibiting the generation of the horseshoe vortex is achieved. Meanwhile, the impact at the outlet is reduced, and the pressure resistance of the wind wheel is improved.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (5)
1. A centrifugal fan blade, comprising:
the pressure surface profile (100) is composed of an arc A (110) and a line segment B (120), and the maximum relative curvature of the pressure surface profile (100) is F1＝H1/L1，L1Is the chord length of the arc A (110), H1Is the maximum camber of the arc A (110);
the back pressure surface molded line (200), the back pressure surface molded line (200) is composed of an arc C (210), and the maximum relative curvature of the pressure surface molded line (100) is F2＝H2/L2，L2Is the chord length of the arc C (210), H2Is the maximum camber of the arc C (210);
wherein, F2Greater than F1。
2. Centrifugal fan blade according to claim 1, wherein H is1Position of (a) and the H2Are not coincident.
3. A centrifugal fan blade according to claim 1 wherein the arc a (110) intersects the line segment B (120) at point O; point P is at the blade trailing edge end point of arc C (210) and PO is perpendicular to segment B (120).
4. A centrifugal fan blade according to claim 1 or 3, wherein the arc a (110) is tangential to the line segment B (120).
5. A centrifugal fan blade according to claim 1 wherein the inlet setting angle of the blade is in the range 63 ° β or less1≤75°。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120779821.5U CN215595989U (en) | 2021-04-16 | 2021-04-16 | Centrifugal fan blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120779821.5U CN215595989U (en) | 2021-04-16 | 2021-04-16 | Centrifugal fan blade |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215595989U true CN215595989U (en) | 2022-01-21 |
Family
ID=79871756
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120779821.5U Active CN215595989U (en) | 2021-04-16 | 2021-04-16 | Centrifugal fan blade |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215595989U (en) |
-
2021
- 2021-04-16 CN CN202120779821.5U patent/CN215595989U/en active Active
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