초록 ▼

A cooling structure 10 for cooling an engine includes an axial flow fan 16 having a plurality of blades 14. A shroud 12 is spaced from and is generally adjacent to the blades 14. A plurality of Helmholtz resonators 24 and 24' is carried by the shroud 12. Each of the resonators 24 and 24' has an open

A cooling structure 10 for cooling an engine includes an axial flow fan 16 having a plurality of blades 14. A shroud 12 is spaced from and is generally adjacent to the blades 14. A plurality of Helmholtz resonators 24 and 24' is carried by the shroud 12. Each of the resonators 24 and 24' has an opening disposed substantially perpendicular with respect to a direction of air flow resulting from rotation of the fan 16. The resonators 24 and 24' are disposed at locations on the shroud 12 which are generally adjacent to tips 32 of the blades 14. The resonators 24 and 24' are tuned to reduce blade passing tone of the fan 14.

대표청구항 ▼

[ What is claimed is:] [1.]1. A cooling structure for cooling an engine comprising:an axial flow fan having a plurality of blades;a shroud spaced from and generally adjacent to said blades; and a plurality of Helmholtz resonators carried by said shroud, each of said resonators having an opening disp

[ What is claimed is:] [1.]1. A cooling structure for cooling an engine comprising:an axial flow fan having a plurality of blades;a shroud spaced from and generally adjacent to said blades; and a plurality of Helmholtz resonators carried by said shroud, each of said resonators having an opening disposed substantially perpendicular with respect to a direction of air flow resulting from rotation of said fan, said resonators being disposed at locations on said shroud which are generally adjacent to tips of said blades, and said resonators being tuned to reduce blade passing tone of the fan,wherein a number of said plurality of resonators are disposed on a first circle concentric with a second circle defined by said blade tips, said first circle having a radius greater than a radius of said second circle, and wherein said shroud has four sides and a number of said resonators are disposed on each said side and each said resonator extends outwardly from an associated side.