TRANSVERSE FAN, FAN PIECE MOLDING DIE, AND MANUFACTURE OF FAN PIECE MOLDING DIE

Japanese Patent JP3653144

B2

PROBLEM TO BE SOLVED: To reduce a noise such as a blade pitch noise while retaining ventilation performance, by outwardly curving against a fan shaft, a periphery mostly separated from the fan shaft and a periphery mostly positioned near to the fan shaft, respectively, in each blade.
SOLUTION: Blades 4 are so formed that their cross sectional shapes are formed into circular arc, and inclined at predetermined angles along a rotational direction against a fan shaft O, and a periphery 4a mostly separated from the fan shaft O and a periphery 4b mostly positioned near to the fan shaft O are outwardly curved against the fan shaft O. By such a constitution, a fan radius Ra being distance from the fan shaft O to each blade peripheral edge 4a is approximately equalized in any position on the peripheral edge 4a. Since the fan radius Ra of each blade 4 is approximately equalized, a nose clearance can be always approximatel,y equally formed regardless of the position of the peripheral edge 4a of each blade 4 opposed to a nose angle. As a result, static pressure distribution caused by the change of the nose clearance may not occur, and also occurrence of an abnormal noise can be reduced to a large extent.

JP5256743	Roll mold for manufacturing optical film
WO/2011/040148	OPTICAL ELEMENT
JP3887700	MOLDED WIRE HARNESS AND MOLDING DIE

Akira Nagamori
Satoshi Konno
Yoichiro Kobayashi

JP17042696A

May 25, 2005

June 28, 1996

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Toshiba Carrier Co., Ltd.

B29C33/42; F04D17/04; F04D29/26; F04D29/28; F04D29/30; F04D29/66; (IPC1-7): F04D17/04; F04D29/26

JP8049690A
JP8049689A
JP58064886U
JP63097899A
JP9158890A
JP5340380A
JP10009189A

Hisashi Hatano
Shunguchi Sekiguchi

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