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CN-121976971-A - Blade for fan rotor, fan and range hood

CN121976971ACN 121976971 ACN121976971 ACN 121976971ACN-121976971-A

Abstract

The invention discloses a blade for a fan rotor, a fan and a range hood, wherein a small blade tip wing is arranged on the radial outer edge of the blade, extends towards the suction side of the blade, comprises a pressure side edge, a suction side edge and a radial outer side surface positioned between the pressure side edge and the suction side edge, and a plurality of grooves are formed in the radial outer side surface of the small blade at intervals; therefore, a plurality of airflow channels are provided between the pressure side edge and the suction side edge of the winglet through the plurality of grooves, when the leakage flow at the top of the winglet is weakened by the winglet, a plurality of airflows respectively passing through the plurality of grooves exist at the top of the blade, and a plurality of small-scale airflows vortexes are generated after the airflows pass through the grooves, so that the large-scale tip airflows can be destroyed, the airflow energy loss and the airflow vortexes noise caused by the large-scale tip airflows are reduced, and the fan efficiency is improved.

Inventors

  • FU WENHAO
  • LIU TIANYI

Assignees

  • 宁波方太厨具有限公司

Dates

Publication Date
20260505
Application Date
20260104

Claims (13)

  1. 1. A blade (10) for a wind turbine rotor, the blade (10) comprising a suction side (11) and a pressure side (12), a radially outer edge of the blade (10) being provided with a winglet (13), the winglet (13) being connected to the radially outer edge of the blade (10) and extending towards the suction side (11); The novel small blade tip wing (13) is characterized by comprising a pressure side edge (132), a suction side edge (131) and a radial outer side surface (133) located between the pressure side edge (132) and the suction side edge (131), wherein a plurality of grooves (134) are formed in the radial outer side surface (133) of the small blade tip wing (13) at intervals, and two ends of each groove (134) extend to the pressure side edge (132) and the suction side edge (131) respectively.
  2. 2. The blade (10) according to claim 1, characterized in that the average thickness T1 of the blade (10) and the thickness T2 of the winglet (13) satisfy 1≤t2/t1≤4.
  3. 3. Blade (10) according to claim 2, wherein the average thickness T1 is 0.5-4mm and the thickness T2 is 1.2-5mm.
  4. 4. A blade (10) according to any of claims 1-3, wherein the winglet (13) comprises a main body section (135) and two end sections (136) located at both ends of the main body section (135), respectively, the main body section (135) having a height h, the height h of the main body section (135) being the distance between the suction side edge (131) of the main body section (135) at any position in its extension direction and the pressure side edge (132), the height of the end section (136) decreasing gradually in a direction from its end close to the main body section (135) towards its other end remote from the main body section (135), the height of the end section (136) being the distance between the suction side edge (131) of the end section (136) at any position in its extension direction and the pressure side edge (132); the winglet (13) has a thickness T2, h/T2 being 1-5.
  5. 5. A blade (10) according to any of claims 1-3, wherein the winglet (13) has a thickness T2 and the recess (134) has a depth s,0.2 +.s/T2 +.0.8.
  6. 6. A blade (10) according to any one of claims 1-3, characterized in that the groove (134) has a depth s, the groove (134) having a width d, the width d being the extension of the groove (134) in a direction perpendicular to its extension and its depth direction, 0.8 ∈d/s ∈5.
  7. 7. A blade (10) according to any of claims 1-3, characterized in that the angle between the extension direction of the groove (134) and the rotor axis is 60 ° -90 °.
  8. 8. The blade (10) according to claim 7, characterized in that the groove (134) extends in a circumferential direction, which is a circumferential direction around the rotor axis, and that the direction of extension of the groove (134) is perpendicular to the rotor axis; An axial distance g is arranged between two adjacent grooves (134) in the axial direction of the rotor, the small blade tip wing (13) has an axial length L, and the axial length L is the extension length of the small blade tip wing (13) in the axial direction of the rotor, and g/L is more than or equal to 0.06 and less than or equal to 0.35.
  9. 9. A blade (10) according to any one of claims 1-3, wherein 2-12 grooves (134) are provided in the radially outer side surface (133).
  10. 10. A blade (10) according to any of claims 1-3, characterized in that at least one of the grooves (134) is provided as a V-groove, a U-groove, a rectangular groove, an arcuate groove or a trapezoidal groove; Or at least one of the grooves (134) has a cross section lying in a plane perpendicular to its direction of extension, the width of the cross section increasing in the direction from the bottom of the groove to the top of the groove.
  11. 11. A blade (10) according to any of claims 1-3, characterized in that the axial length of the winglet (13) is 12-50mm, the depth of the recess (134) is 0.4-3mm, and the width d of the recess (134) is 1-5mm.
  12. 12. A fan comprising a blade (10) according to any of claims 1-11.
  13. 13. A range hood comprising the blower of claim 12.

Description

Blade for fan rotor, fan and range hood Technical Field The invention relates to the technical field of household appliances, in particular to a blade for a fan rotor, a fan and a range hood. Background The air quantity, the pressure rise, the efficiency and the noise are important performance indexes of the fan of the range hood, the existing range hood commonly uses a centrifugal fan, and an axial flow fan or a diagonal flow fan is rarely used. For realizing the same air volume pressure rise, the noise of the axial flow fan and the diagonal flow fan is larger than that of the centrifugal fan, and the axial flow fan needs to achieve the same performance as the existing centrifugal fan of the range hood, and has larger noise. In an axial flow fan, in order to ensure relative movement between a rotor and a casing, a certain blade top gap exists between the top of a moving blade and the casing, when the moving blade rotates, static pressure on the pressure side of the tip of the moving blade is larger than that on the suction side, fluid leaks from the pressure side to the suction side through the blade top gap under the action of pressure difference, so that a blade top leakage flow is generated, a vortex is formed, namely, a tip separation flow or a tip leakage vortex is formed, flow resistance is increased, airflow flow loss is caused, vortex noise is generated, and the efficiency of the fan is influenced. Disclosure of Invention In order to solve the problems in the prior art, the invention provides a blade for a fan rotor, a fan and a range hood, and leakage flow generated by a blade top gap is reduced and fan noise is reduced by optimizing the blade structure of the fan rotor. In a first aspect, the present invention provides a blade for a wind turbine rotor, the blade comprising a suction side and a pressure side, the radially outer edge of the blade being provided with a winglet, the winglet being connected to the radially outer edge of the blade and extending towards the suction side; The small blade tip wing comprises a pressure side edge, a suction side edge and a radial outer side surface positioned between the pressure side edge and the suction side edge, a plurality of grooves are formed in the radial outer side surface of the small blade tip wing at intervals, and two ends of each groove extend to the pressure side edge and the suction side edge respectively. Optionally, the average thickness T1 of the blade and the thickness T2 of the winglet meet the condition that T2/T1 is less than or equal to 1 and less than or equal to 4. Alternatively, the average thickness T1 is 0.5-4mm, and the thickness T2 is 1.2-5mm. Optionally, the winglet comprises a main wing section and two end wing sections respectively positioned at two ends of the main wing section, wherein the main wing section has a height h, and the height h of the main wing section is the distance between the suction side edge of the main wing section at any position in the extending direction of the main wing section and the pressure side edge; The winglet has a thickness T2, h/T2 of 1-5. Optionally, the winglet has a thickness T2 and the recess has a depth s of 0.2 +.s/T2 +.0.8. Optionally, the groove has a depth s, and the groove has a width d, where d is an extension length of the groove in a direction perpendicular to an extension direction and a depth direction of the groove, and d/s is 0.8≤d≤5. Optionally, an included angle between the extending direction of the groove and the axial direction of the rotor is 60-90 degrees. Optionally, the groove extends along a circumferential direction, and the extending direction of the groove is perpendicular to the axial direction of the rotor, and the circumferential direction is the circumferential direction around the axial direction of the rotor; The axial distance g between two adjacent grooves in the axial direction of the rotor is equal to or less than 0.06 g/L and is equal to or less than 0.35, and the small blade tip has an axial length L which is the extension length of the small blade tip in the axial direction of the rotor. Optionally, 2-12 grooves are formed in the radial outer side face. Optionally, at least one of the grooves is provided as a V-groove, a U-groove, a rectangular groove, an arc-shaped groove or a trapezoidal groove. Optionally, at least one of the grooves has a cross section lying in a plane perpendicular to its direction of extension, the width of the cross section increasing in a direction from the bottom of the groove to the top of the groove. Optionally, the axial length of the winglet is 12-50mm, the depth of the groove is 0.4-3mm, and the width d of the groove is 1-5mm. In a second aspect, the invention provides a fan, which comprises the blade according to the technical scheme. In a third aspect, the invention provides a range hood, which comprises the fan according to the technical scheme. The invention has the following beneficial effects: The utility model