Title (en)

INDUSTRIAL AXIAL-FLOW FAN HAVING OFFSET AIRFOIL-TO-HUB MOUNTING SYSTEM FOR IMPROVED AERODYNAMIC PERFORMANCE

Publication

EP 0413663 A3 19920115 (EN)

Application

EP 90810598 A 19900808

Priority

AR 31465889 A 19890814

Abstract (en)

[origin: EP0413663A2] An industrial fan (1) having a plurality of blades (2) attached to a common hub (21), wherein each blade (2) has a substantially uniform aerodynamic shape the lenght thereof including its root, by virtue of novel attachment means which do not require added strengthening of the root deforming its aerodynamic shape, thereby improving overall performance. The attachment means include an intermediate member (13) of each blade (2) coupled to the hub (9) and clamped against one of the faces of the associated blade (2). Radial pivot means are provided between each intermediate member (13) and the hub (9) according to feathering axes offset from the blade longitudinal axes, for manually adjusting the pitch (angle of incidence) of the blades according to a required flow. The invention also includes a pneumatic system (30) for varying the position (pitch) of the fan blades in motion.

IPC 1-7

F04D 29/36; F04D 19/00

IPC 8 full level

F04D 19/00 (2006.01); F04D 29/36 (2006.01)

CPC (source: EP)

F04D 19/002 (2013.01); F04D 29/36 (2013.01)

Citation (search report)

• [A] FR 2498266 A3 19820723 - AXIAL ITALIANA [IT]
• [A] US 1935314 A 19331114 - FINCH HERBERT I, et al
• [A] US 2656971 A 19531027 - MADER EMIL A
• [A] FR 951522 A 19491027
• [A] DE 2548372 A1 19760506 - AXIAL INT ESTABLISHMENT
• [A] DE 2807899 A1 19780831 - AXIAL INTERNATIONAL AG
• [A] FR 1500088 A 19671103
• [A] FR 2542386 B3 19850419 - VASAPOLLI SERGIO [IT]

Designated contracting state (EPC)

AT BE CH DE DK ES FR GB GR IT LI LU NL SE

DOCDB simple family (publication)

EP 0413663 A2 19910220; EP 0413663 A3 19920115; AR 240846 A1 19910228; AR 240846 A2 19910228; BR 9004017 A 19910903

DOCDB simple family (application)

EP 90810598 A 19900808; AR 31465889 A 19890814; BR 9004017 A 19900814