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CN-116972018-B - Fan blade and axial flow fan

CN116972018BCN 116972018 BCN116972018 BCN 116972018BCN-116972018-B

Abstract

The invention provides a fan blade and an axial flow fan. The fan blade is divided into an S0 section to an S14 section from a blade root to a blade tip along the chord length direction of the blade, the angle range of the installation angle of the blade is more than or equal to 27.0 degrees and less than or equal to 33.0 degrees in the range from the S8 section to the S14 section of the blade, and the numerical range of the chord ratio beta of the blade is more than or equal to 1.30 and less than or equal to beta and less than or equal to 1.40. According to the fan blade and the axial flow fan provided by the invention, the S8 section to the S14 section of the blade are the efficient acting areas of the blade, the pitch-to-chord ratio beta and the installation angle of the efficient acting areas are defined by reasonably limiting, the wind resistance of the fan blade is effectively reduced, the acting efficiency of the blade is improved, the higher air quantity under the low Reynolds number flow is ensured, the problem of air current stall is reduced, the noise is reduced, the airflow shedding vortex formation at the tail edge of the blade top is reduced, the pneumatic noise of the blade is further improved, and the comfort of a user is improved.

Inventors

  • YUAN GUOLU
  • MA ZHAOJUN

Assignees

  • 珠海格力电器股份有限公司

Dates

Publication Date
20260505
Application Date
20230823

Claims (12)

  1. 1. A fan blade is characterized in that the blade (1) is divided into an S0 section to an S14 section from a blade root (11) to a blade tip (12) along the chord length direction of the blade (1), the angle range of the installation angle of the blade (1) is 27.0 degrees less than or equal to 33.0 degrees and less than or equal to 33.0 degrees in the range of the S8 section to the S14 section of the blade (1), the numerical range of the chord ratio beta of the blade (1) is 1.16 less than or equal to beta less than or equal to 1.40 in the range of the S0 to the S14 of the blade (1), the chord ratio beta of the blade (1) is gradually increased to the S10 section of the blade (1), and the chord ratio beta of the blade (1) is gradually decreased to the S0 section of the blade (1).
  2. 2. A fan blade according to claim 1, characterized in that the value range of the pitch ratio beta of the blade (1) in the S10 section of the blade (1) is 1.37. Ltoreq.beta≤1.40.
  3. 3. The fan blade according to claim 1, characterized in that the angle of the mounting angle is in the range of 27.5 DEG≤α≤32.9 DEG in the range of the S11 section of the blade (1) to the S14 section of the blade (1), and the angle of the mounting angle α gradually increases.
  4. 4. A fan blade according to claim 1 or 3, wherein the angle of the mounting angle alpha of the blade (1) is in the range of 27.5 DEG≤alpha≤33.7 DEG in the range of S0 section to S14 section of the blade (1), and the angle of the mounting angle alpha of the blade (1) is gradually increased in the S9 section to S7 section of the blade (1), in the S7 section to S3 section of the blade (1), in the S1 section to S0 section of the blade (1), and gradually decreased in the S9 section to S7 section of the blade (1), in the S3 section to S1 section of the blade (1).
  5. 5. A fan blade according to claim 4, characterized in that the angle of the mounting angle alpha in the S3 section of the blade (1) is 33.3 DEG≤alpha≤33.7 °.
  6. 6. A fan blade according to claim 1, wherein the thickness t of the blade (1) ranges from 2.4 mm≤θ≤9.1 mm, and the S14 section of the blade (1) to the S0 section of the blade (1), the thickness of the blade (1) gradually increases.
  7. 7. A fan blade according to claim 6, characterized in that the value of the thickness t of the blade (1) ranges from 2.4 mm≤θ≤4.0 mm in the range from the S14 section of the blade (1) to the S10 section of the blade (1) and/or that the value of the thickness t of the blade (1) ranges from 7.0 mm≤θ≤9.1 mm in the range from the S3 section of the blade (1) to the S0 section of the blade (1).
  8. 8. A fan blade according to claim 1, characterized in that the curved surface of the blade (1) is twisted and that the camber of the blade (1) is greatest at the S7 section of the blade (1).
  9. 9. The fan blade of claim 1, wherein the mounting angle α satisfies the formula: α=258.37x 6 -1363.8x 5 +1900.3x 4 -1067.7x 3 +246.5x 2 -18.106x+33.193, Wherein 0< x <0.71; α= -23.8x 2 +26.1x+26.437, where 0.71+.x <1; wherein x is the ratio of the position of the blade (1) where the section is located to the distance from the section to the root of the blade (1).
  10. 10. A fan blade according to claim 1, characterized in that the chord ratio β of the blade (1) satisfies the following formula: β= 0.0366x 2 +0.27933 x+1.1555, where 0< x <0.71; beta= -0.28x+1.57, wherein 0.71≤x <1; wherein x is the ratio of the position of the blade (1) where the section is located to the distance from the section to the root of the blade (1).
  11. 11. The fan blade according to claim 7, characterized in that the thickness θ of the blade (1) satisfies the following formula: θ=8.74x2-14.5x+9.1, where 0< x <0.71; θ= -4.2x2+3.98x+2.7, where 0.71+.x <1; wherein x is the ratio of the position of the blade (1) where the section is located to the distance from the section to the root of the blade (1).
  12. 12. An axial flow fan comprising the fan blade according to any one of claims 1 to 11.

Description

Fan blade and axial flow fan Technical Field The invention relates to the technical field of air treatment equipment, in particular to a fan blade and an axial flow fan. Background The conventional axial flow fan blade of the air conditioner drives air flow to perform efficient heat exchange, and the problems of more noise vortex of the air flow, blocking factors in the air flow air inlet process and stall in the air flow air outlet process in the blade row channels generally cause the defects of low efficiency and high noise of the conventional axial flow fan blade. If a closed fan is adopted, the closed guide ring and the axial flow fan blade are matched for use, so that leakage of the top of the fan blade is reduced, backflow of a low-pressure area and a high-pressure area is inhibited, the fan efficiency is effectively improved, and the fan noise is reduced. But the large-size axial flow fan has the problem that high efficiency and high running strength are difficult to be compatible, and the running strength of the large-size axial flow fan can be improved by increasing the thickness of the blades in the prior art generally, so that the large-size axial flow fan in the prior art can not meet the lifting requirements of consumer markets, and the problems of overlarge airflow resistance and poor fan efficiency caused by overlarge thickness of the blades can be solved. Disclosure of Invention In order to solve the technical problems of high power consumption and high noise of an axial flow fan caused by unreasonable blade profile design of fan blades in the prior art, the fan blades and the axial flow fan with reasonable blade pitch-chord ratio beta and installation angle alpha are provided to improve the efficiency of the axial flow fan, reduce the noise of the fan and reduce the airflow resistance. A fan blade is characterized in that the blade is divided into an S0 section to an S14 section from a blade root to a blade top along the chord length direction of the blade, the angle range of the installation angle of the blade is more than or equal to 27.0 degrees and less than or equal to 33.0 degrees in the range from the S8 section to the S14 section of the blade, and the numerical range of the pitch chord ratio beta of the blade is more than or equal to 1.30 and less than or equal to beta and less than or equal to 1.40. In the range of S0 to S14 of the blade, the numerical range of the chord ratio beta of the blade is 1.16-beta-1.37, the chord ratio beta of the blade gradually increases from the S14 section of the blade to the S10 section of the blade, the chord ratio beta of the blade gradually decreases from the S10 section of the blade to the S0 section of the blade. The numerical range of the chord ratio beta of the blade in the S10 section of the blade is 1.37-1.40. The angle range of the installation angle is 27.5 degrees or more and is or less than or equal to 32.9 degrees or less in the range from the S11 section of the blade to the S14 section of the blade, and the angle of the installation angle alpha is gradually increased from the S14 section of the blade to the S11 section of the blade. The angle range of the installation angle alpha of the blade is 27.5 DEG≤alpha≤33.7 DEG in the range of the S0 section to the S14 section of the blade, and the angle of the installation angle alpha of the blade gradually increases in the S14 section to the S9 section, the S7 section to the S3 section, the S1 section to the S0 section of the blade, and the angle of the installation angle alpha of the blade gradually decreases in the S9 section to the S7 section, the S3 section to the S1 section of the blade. In the S3 section of the blade, the angle of the mounting angle alpha is 33.3 DEG≤alpha≤33.7 deg. The thickness theta of the blade is in the range of 2.4 mm-9.1 mm, and the thickness of the blade gradually increases from the S14 section of the blade to the S0 section of the blade. The value range of the thickness t of the blade is 2.4mm less than or equal to theta less than or equal to 4.0mm in the range from the S14 section of the blade to the S10 section of the blade, and/or the value range of the thickness t of the blade is 7.0mm less than or equal to theta less than or equal to 9.1mm in the range from the S3 section of the blade to the S0 section of the blade. The curved surface of the blade is in a torsion shape, and the bending degree of the blade is maximum at the S7 section of the blade. The mounting angle α satisfies the following formula: α＝258.37x6-1363.8x5+1900.3x4-1067.7x3+246.5x2-18.106x+33.193, wherein 0< x <0.71; α= -23.8x2+26.1x+26.437, where 0.71≤x <1; Where x is the ratio of the position of the blade where the section is located to the distance of the section from the root of the blade. The chord ratio β of the blade satisfies the following formula: beta = 0.0366x2+0.2793x+1.1555, where 0< x <0.71; beta= -0.28x+1.57, wherein 0.71≤x <1; Where x is the ratio of the position of the blade