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CN-115727002-B - Blade and axial flow fan using same

CN115727002BCN 115727002 BCN115727002 BCN 115727002BCN-115727002-B

Abstract

The application discloses a blade which comprises a pressure surface, a suction surface, a blade top, a blade root, a leading edge and a trailing edge, wherein the blade comprises a wave-shaped part, the wave-shaped part comprises at least two wave crests and at least two wave troughs, the at least two wave crests and the at least two wave troughs are staggered in the radial direction of the blade, and each wave crest and each wave trough extend along the circumferential direction of the blade. The blade and the axial flow fan using the same increase the strength of the blade by arranging at least two pairs of continuous wave crests and wave troughs in the radial direction of the blade, and prevent the blade from being broken from the blade root when the power is excessive. The application controls the positions and the camber of the wave crests and the wave troughs, so that the air flow separation on the surfaces of the blades is well controlled, and the working efficiency of the axial fan is not influenced. Meanwhile, as the wave crests and the wave troughs are increased, the surface area of the blades is increased, the acting area is increased, and the working efficiency of the axial flow fan is improved.

Inventors

  • WU CHENGGANG
  • YUAN BIN
  • MA XIAOKUI
  • WANG LI
  • ZHU JIAN

Assignees

  • 约克广州空调冷冻设备有限公司
  • 江森自控泰科知识产权控股有限责任合伙公司

Dates

Publication Date
20260505
Application Date
20210901

Claims (8)

  1. 1. A blade, characterized in that the blade (102) comprises: A pressure side (111) and a suction side (112), the pressure side (111) and the suction side (112) forming opposite surfaces of the blade (102), and -A tip (215), -a root (216), -a leading edge (213) and-a trailing edge (214), -said tip (215), -said root (216), -said leading edge (213) and-said trailing edge (214) defining the outer edges of said pressure surface (111) and said suction surface (112), wherein said leading edge (213) and said trailing edge (214) extend from said tip (215) to said root (216), respectively, wherein at any circumferential cross-section of said blade (102) an angle Zhou Xiangrui between said trailing edge (214) and said leading edge (213) forms a circumferential wrap angle θ; Wherein the blade comprises a wave-shaped portion comprising at least two peaks (241,243) and at least two valleys (240, 242), the valleys (240, 242) being formed by at least one recess (220, 222) recessed in a direction from the pressure surface (111) to the suction surface (112), the peaks (241,243) being formed by at least one arch (221, 223) arched in a direction from the suction surface (112) to the pressure surface (111), the at least one recess (220, 222) and at least one arch (221, 223) meeting to form the wave-shaped portion; Wherein the at least two peaks (241,243) and the at least two valleys (240, 242) are staggered in a radial direction of the blade (102) and each of the peaks (241,243) and each of the valleys (240, 242) extends in a circumferential direction of the blade (102), wherein the at least two peaks (241,243) and the at least two valleys (240, 242) comprise a first valley (240), a first peak (241), a second valley (242) and a second peak (243) in order in a radial direction from the tip (215) to the root (216), wherein the first valley (240) is closest to the tip (215), and Wherein, on the circumferential section where the first trough (240) is located, a Zhou Xiangrui included angle between the trailing edge (214) and the leading edge (213) forms a circumferential wrap angle theta 1 , and a Zhou Xiangrui included angle of the first trough (240) is 0.6θ 1 ; -on the circumferential cross section where the first peak (241) is located, the angle Zhou Xiangrui between the trailing edge (214) and the leading edge (213) forms a circumferential wrap angle θ 2 , the angle Zhou Xiangrui of the first peak (241) being 0.9θ 2 ; -on the circumferential cross section where the second trough (242) is located, the angle Zhou Xiangrui between the trailing edge (214) and the leading edge (213) forms a circumferential wrap angle θ 3 , the angle Zhou Xiangrui of the second trough (242) being 0.7θ 3 ; On a circumferential section where the second peak (243) is located, a Zhou Xiangrui included angle between the trailing edge (214) and the leading edge (213) forms a circumferential wrap angle theta 4 , and a Zhou Xiangrui included angle of the second peak (243) is 0.8θ 4 .
  2. 2. A blade according to claim 1, characterized in that: The blade (102) is rotatable about a rotation axis (x), the rotation axis (x) being perpendicular to a normal plane; each of the peaks (241,243) forming a peak camber line (231, 233) on a projection of the normal plane of the blade (102), and Each of the valleys (240, 242) forming a valley arc (230, 232) on a projection of the normal plane of the blade (102); wherein each of the peak circular arcs (231, 233) and each of the trough circular arcs (230, 232) are concentric circular arcs centered on a projection center (O) of the rotation axis (x).
  3. 3. A blade according to claim 1, characterized in that: The blade (102) has a blade radial height (L) which is the distance of the blade root (216) from the blade tip (215) on projection of a normal plane of the blade (102); wherein the distance between the first trough (240) and the blade root (216) is (0.9-0.95) L; the distance between the first crest (241) and the blade root (216) is (0.7-0.8) L; the distance between the second trough (242) and the blade root (216) is (0.45-0.55) L; the distance between the second wave crest (243) and the blade root (216) is (0.2-0.3) L.
  4. 4. A blade according to claim 3, characterized in that: -the first trough (240) is at a distance of 0.9375L from the blade root (216); -the first crest (241) is at a distance of 0.75L from the blade root (216); -the second trough (242) is at a distance of 0.5L from the blade root (216); The second crest (243) is at a distance of 0.25L from the blade root (216).
  5. 5. A blade according to claim 1, characterized in that: Any point on the blade (102) has a circumferential position angle, which is an included angle Zhou Xiangrui between the point and the leading edge, on a circumferential cross-section of the point; The circumferential position angle of the starting position of the first trough (240) is theta 1 , and the circumferential position angle of the ending position of the first trough (240) is 0.4 theta 1 ; a circumferential position angle of a start position of the first peak (241) is θ 2 , and a circumferential position angle of a termination position of the first peak (241) is 0.1 θ 2 ; A circumferential position angle of a start position of the second trough (242) is theta 3 , and a circumferential position angle of a finish position of the second trough (242) is 0.3 theta 3 ; the circumferential position angle of the starting position of the second peak (243) is theta 4 , and the circumferential position angle of the ending position of the second peak (243) is 0.2 theta 4 .
  6. 6. A blade according to claim 1, characterized in that: -the blade (102) is rotatable about a rotation axis (x), the blade (102) having a blade radius (R), the blade radius (R) of the blade (102) being the distance of the tip (215) from the rotation axis (x); On each radial section of the blade (102), the maximum camber of the first trough (240) is (0.6-4)% R; the maximum arch height of the first wave crest (241) is (1.4-12)% R; the maximum arch height of the second trough (242) is (0.6-4)% R; The maximum arch height of the second wave crest (243) is (0.6-3)% R.
  7. 7. A blade according to claim 1, characterized in that: the peaks (241,243) and the valleys (240, 242) are rounded.
  8. 8. An axial flow impeller (100), characterized by comprising: A hub (110), the hub (110) having a rotation axis (x), the hub (110) being rotatable about the rotation axis (x), and At least two blades (102) according to any of claims 1-7, said at least two blades (102) being arranged on an outer circumferential surface of said hub (110).

Description

Blade and axial flow fan using same Technical Field The application relates to the field of rotary machinery such as fans, pumps, compressors and the like, in particular to a blade and an axial flow fan using the same. Background In general, rotating machines such as fans and the like are formed by circumferentially arranging blades with different numbers at intervals, and the blades are formed by extending a plurality of blade profile sections along the spanwise direction of a leading edge and a trailing edge. The blade has a leading edge for the inflow of the medium and a trailing edge for the outflow of the medium, and a concave pressure surface and a convex suction surface, the position of the blade close to the hub being called the blade root and the position of the maximum diameter of the blade being called the blade tip. When the existing blade rotates, the centrifugal force is applied, the strength of the blade is insufficient, and the blade tip is easy to deform. Disclosure of Invention In order to solve the above problems, at least one object of the present application is to provide a blade comprising a pressure side and a suction side, the pressure side and the suction side forming opposite two surfaces of the blade, a blade tip, a blade root, a leading edge and a trailing edge, the blade tip, the blade root, the leading edge and the trailing edge defining outer edges of the pressure side and the suction side, wherein the leading edge and the trailing edge extend from the blade tip to the blade root, respectively, wherein the blade comprises a wave-shaped portion comprising at least two peaks and at least two valleys, the valleys being formed by at least one depression depressed in a direction from the pressure side to the suction side, the peaks being formed by at least one raised portion raised in a direction from the suction side to the pressure side, the at least one depression and at least one raised portion being joined to form the wave-shaped portion, wherein the at least two peaks and the at least two valleys of the blade are arranged alternately in the circumferential direction of each of the wave-shaped portion extending in the circumferential direction of the wave-shaped portion. According to the first aspect, the blade can rotate around a rotation axis, the rotation axis is perpendicular to a normal plane, each wave crest forms a wave crest circular arc line on the projection of the normal plane of the blade, each wave trough forms a wave trough circular arc line on the projection of the normal plane of the blade, and each wave crest circular arc line and each wave trough circular arc line are concentric circular arcs taking the projection center of the rotation axis as a circle center. According to the first aspect, in a radial direction from the tip to the root, the at least two peaks and the at least two valleys sequentially include a first valley, a first peak, a second valley, and a second peak, wherein the first valley is closest to the tip. According to the first aspect, the blade is provided with a radial height of the blade, the radial height of the blade is the distance between the blade root and the blade tip on the projection of the normal plane of the blade, the distance between the first wave trough and the blade root is (0.9-0.95) L, the distance between the first wave trough and the blade root is (0.7-0.8) L, the distance between the second wave trough and the blade root is (0.45-0.55) L, and the distance between the second wave trough and the blade root is (0.2-0.3) L. According to the first aspect, the distance between the first trough and the blade root is 0.9375L, the distance between the first crest and the blade root is 0.75L, the distance between the second trough and the blade root is 0.5L, and the distance between the second crest and the blade root is 0.25L. According to the first aspect, a circumferential wrap angle is formed by a Zhou Xiangrui included angle between the tail edge and the front edge on any circumferential cross section of the blade, wherein a circumferential wrap angle is formed by a Zhou Xiangrui included angle between the tail edge and the front edge on the circumferential cross section where the first trough is located, a Zhou Xiangrui included angle of the first trough is 0.6θ 1, a circumferential wrap angle is formed by a Zhou Xiangrui included angle between the tail edge and the front edge on the circumferential cross section where the first crest is located, a Zhou Xiangrui included angle of the first crest is 0.9θ 2, a circumferential wrap angle is formed by a Zhou Xiangrui included angle between the tail edge and the front edge on the circumferential cross section where the second trough is located, a Zhou Xiangrui included angle of the second trough is 0.7θ 3, a circumferential wrap angle is formed by a Zhou Xiangrui included angle between the tail edge and the front edge on the circumferential cross section where the second crest