CN220248450U - Axial flow fan blade - Google Patents

Abstract

The utility model relates to an axial flow fan blade, which comprises a blade, wherein a suction surface of the blade is provided with a plurality of first concave parts which are arranged at intervals and a plurality of second concave parts which are arranged at intervals, and the shapes of the first concave parts and the second concave parts are different or the same. The first concave parts and the second concave parts are respectively arranged at intervals along the front edge and the tail edge of the suction surface of the blade. The first concave part comprises a front contour line, and a first interval L is arranged between the front contour line and the front edge line of the blade. The first spacing L is formed by offsetting the line of the front edge of the blade towards the direction of the tail edge of the blade, and the offset distance is 10mm to 20mm. The first pitch L is the distance of the first recess front contour from the blade front edge, limiting a=10 mm-20mm: if the distance between the front contour line of the first concave part and the front edge of the blade is more than 10mm, the strength of the front edge of the wind wheel is ensured; to limit the generation and development of vortices.

Description

Axial flow fan blade

Technical Field

The utility model relates to the technical field of ventilation equipment, in particular to an axial flow fan blade.

Background

CN111022371a discloses an axial flow fan blade and fan with this fan blade through set up several groove structure at the trailing edge of blade can make the air current of pressure face part flow into the back pressure face dispersedly, makes the vortex dispersion that the back pressure face produced, can effectively weaken the vortex intensity of the back pressure face of axial flow fan blade, reduces the impact of the wake vortex of preceding axial flow fan blade to the latter axial flow fan blade to can effectively promote the amount of wind, reduce axial flow fan's noise.

CN114046268A discloses a fan blade suitable for a front-mounted axial flow fan of a motor frame, when airflow flows through a pit, a vortex structure is formed in the pit, the turbulence energy level of a boundary layer is improved, so that the boundary layer is enabled to be transited in advance, a large-scale vortex structure formed by the surrounding flow of the motor frame is favorably damaged, a small-scale isotropic turbulence is formed, turbulence noise is reduced, flow uniformity is improved, the flow state of the fan is improved, and therefore, the performance of the axial flow fan is improved.

Based on the two axial flow fan blades, the applicant designs an axial flow fan blade, and the suction surface of the axial flow fan blade is provided with pit structures with two different shapes, so that the turbulence energy of fluid can be reduced, vortex shedding at the tail edge of the fan blade is reduced, and noise is reduced; the weight of the wind wheel is reduced, the light weight is realized, and the production cost is reduced.

Disclosure of Invention

The utility model aims to provide an axial flow fan blade, which can reduce the turbulence energy of fluid, reduce vortex shedding at the tail edge of the blade and reduce noise by arranging two pit structures with different shapes on the suction surface of the blade; the weight of the wind wheel is reduced, the light weight is realized, and the production cost is reduced.

The axial flow fan blade designed according to the purpose comprises a blade, wherein a plurality of first concave parts which are arranged at intervals and a plurality of second concave parts which are arranged at intervals are arranged on the suction surface of the blade, and the shapes of the first concave parts and the second concave parts are different or the same.

By arranging two pit structures with different shapes on the suction surface of the blade, the turbulence energy of fluid can be reduced, vortex shedding at the tail edge of the blade is reduced, and noise is reduced; the weight of the wind wheel is reduced, the light weight is realized, and the production cost is reduced.

The first concave parts and the second concave parts are respectively arranged at intervals along the front edge and the tail edge of the suction surface of the blade.

The first concave part comprises a front contour line, and a first interval L is arranged between the front contour line and the front edge line of the blade.

The first spacing L is formed by offsetting the line of the front edge of the blade towards the direction of the tail edge of the blade, and the offset distance is 10mm to 20mm. The first pitch L is the distance of the first recess front contour from the blade front edge, limiting a=10 mm-20mm: if the distance between the front contour line of the first concave part and the front edge of the blade is more than 10mm, the strength of the front edge of the wind wheel is ensured; if the distance between the front contour line of the first concave part and the front edge of the blade is within 20mm, the front contour line of the first concave part is limited to be close to the front edge of the blade, so that after the airflow flows through the front edge of the blade, the airflow quickly enters the first concave part to limit the generation and development of vortex.

The first concave part comprises a rear contour line, the pressure surface of the blade deviates along the vertical direction to form a curved surface intersecting with the suction surface of the blade, the rear contour line is the intersecting line of the curved surface and the suction surface of the blade, the thickness of the blade is x, and then the deviation distance of the pressure surface of the blade is h more than or equal to 0.8x or h less than or equal to 0.9x.

The offset distance h of the pressure surface of the blade is the limit on the position of the back contour line of the first concave part, and h is more than or equal to 0.8x, so that the maximum length of the first concave part is limited, and the air flow is prevented from stagnating in the concave pit, thereby causing extra energy loss; h is less than or equal to 0.9x, and the minimum length of the first concave part is limited, so that the airflow is fully dispersed, and the vortex strength is weakened.

The plurality of blades are arranged on the hub, the plurality of blades are circumferentially distributed and arranged along the center of the hub, the first concave part comprises side contour lines, the side contour lines and the outer circle lines of the blades are respectively arranged through the center of the hub as circle centers, so that the side contour lines and the outer circle lines of the blades are arranged in concentric circles, the width of one first concave part is b, the width b is the radius difference of two concentric circles, the radius of the outer circle line of the blade is R, b is more than or equal to 0.05R or b is more than or equal to 0.10R, the width of the first concave part is limited by the arrangement of the width of the first concave part, the air flow cannot be fully dispersed due to the fact that the width of the first concave part is too large or too small, and the effect of a pit structure is affected.

One of the second recesses is circular with a circular diameter d=2 mm to 4mm.

One of the first recesses has the same depth as a second recess, and the depth c=0.8 mm to 1.5mm.

The first concave parts are equal or unequal in spacing.

The spacing between the second concave parts is equal or unequal.

The utility model has the following beneficial effects:

by arranging two pit structures with different shapes on the suction surface of the blade, the turbulence energy of fluid can be reduced, vortex shedding at the tail edge of the blade is reduced, and noise is reduced; the weight of the wind wheel is reduced, the light weight is realized, and the production cost is reduced.

Drawings

Fig. 1 is a schematic perspective view of an axial flow fan blade according to an embodiment of the present utility model.

Fig. 2 is a schematic plan view of an axial flow fan blade according to an embodiment of the present utility model.

Fig. 3 is a schematic view of a first concave contour line structure according to an embodiment of the utility model.

Detailed Description

The utility model is further described below with reference to the drawings and examples.

Referring to fig. 1-3, an axial flow fan blade comprises a blade 1, wherein a suction surface of the blade 1 is provided with a plurality of first concave parts 2 arranged at intervals and a plurality of second concave parts 3 arranged at intervals, and the shapes of the first concave parts 2 and the second concave parts 3 are different or the same.

The first concave parts 2 and the second concave parts 3 are respectively arranged at intervals along the front edge and the tail edge of the suction surface of the blade 1.

The first recess 2 comprises a front contour 4, the front contour 4 being at a first distance L from the front edge profile of the blade 1.

The first spacing L is formed by offsetting the line of the front edge of the blade 1 towards the tail edge of the blade 1, and the offset distance is 10mm to 20mm.

The first concave part 2 comprises a rear contour line 5, the pressure surface of the blade 1 deviates along the vertical direction to form a curved surface intersecting with the suction surface of the blade 1, the rear contour line 5 is the intersecting line of the curved surface and the suction surface of the blade 1, the thickness of the blade 1 is x, and then the deviation distance h of the pressure surface of the blade 1 is more than or equal to 0.8x or less than or equal to 0.9x.

The plurality of blades 1 are arranged on the hub 7, the plurality of blades 1 are circumferentially distributed and arranged along the center of the hub 7, the first concave portions 2 comprise side contour lines 6, the side contour lines 6 and the outer circle lines of the blades 1 respectively serve as circle centers through the center of the hub 7, so that the side contour lines 6 and the outer circle lines of the blades 1 are arranged in concentric circles, the width of one first concave portion 2 is b, the width b is the radius difference of two concentric circles, the radius of the outer circle line of the blade 1 is R, and b is more than or equal to 0.05R or b is more than or equal to 0.10R.

One of the second recesses 3 is circular with a circular diameter d=2 mm to 4mm.

One of the first recesses 2 is equal to a second recess 3 in depth, c=0.8 mm to 1.5mm.

The first recesses 2 may be equally spaced or unequally spaced.

The pitches between the plurality of second concave portions 3 are equal or unequal.

In the present embodiment, the first concave portions 2 are provided with 3 to 5.

The foregoing is a preferred embodiment of the utility model showing and describing the general principles, features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the foregoing embodiments, which have been described in the foregoing description merely illustrates the principles of the utility model, and that various changes and modifications may be made therein without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (10)

1. An axial flow fan blade, includes blade (1), its characterized in that: the suction surface of the blade (1) is provided with a plurality of first concave parts (2) which are arranged at intervals and a plurality of second concave parts (3) which are arranged at intervals, and the shapes of the first concave parts (2) and the second concave parts (3) are different or the same.

2. The axial flow fan blade of claim 1, wherein: the first concave parts (2) and the second concave parts (3) are respectively arranged at intervals along the front edge and the tail edge of the suction surface of the blade (1).

3. The axial flow fan blade of claim 1, wherein: the first recess (2) comprises a front contour line (4), and a first distance L is arranged between the front contour line (4) and the front edge line of the blade (1).

4. An axial flow fan blade according to claim 3, wherein: the first interval L is formed by shifting the leading edge molded line of the blade (1) to the trailing edge direction of the blade (1), and the shifting distance is 10mm to 20mm.

5. The axial flow fan blade of claim 1, wherein: the first concave part (2) comprises a rear contour line (5), the pressure surface of the blade (1) is offset along the vertical direction to form a curved surface intersecting with the suction surface of the blade (1), the rear contour line (5) is the intersecting line of the curved surface and the suction surface of the blade (1), the thickness of the blade (1) is x, and then the offset distance of the pressure surface of the blade (1) is h which is more than or equal to 0.8x or h which is less than or equal to 0.9x.

6. The axial flow fan blade of claim 1, wherein: a plurality of blades (1) are arranged on a hub (7), the blades (1) are circumferentially distributed and arranged along the center of the hub (7), the first concave portions (2) comprise side contour lines (6), the side contour lines (6) and the outer circle lines of the blades (1) are respectively arranged through the centers of the hubs (7) as circle centers, so that the side contour lines (6) and the outer circle lines of the blades (1) are arranged in concentric circles, the width of one first concave portion (2) is b, the width b is the radius difference of two concentric circles, the radius of the outer circle line of the blade (1) is R, and b is more than or equal to 0.05R or b is more than or equal to 0.10R.

7. The axial flow fan blade of claim 1, wherein: one of the second recesses (3) is circular with a circular diameter d = 2mm to 4mm.

8. The axial flow fan blade of claim 1, wherein: one of the first recesses (2) is of equal depth to a second recess (3), the depth c=0.8 mm to 1.5mm.

9. The axial flow fan blade of claim 1, wherein: the intervals among the first concave parts (2) are equal or unequal.

10. The axial flow fan blade of claim 1, wherein: the spacing between the second concave parts (3) is equal or unequal.