Impeller for an axial flow fan

Details Impeller for an axial flow fan Impeller for an axial flow fan

1988-04-11

1989-07-04

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Having positive means for impeller adjustment

Motor bodily rotatable with impeller hub or shaft

416147, 416168R, 416205, 416209, F04D 2936

Patent

active

048446971

ABSTRACT:
In an impeller for use in an axial flow fan and having blades (5) which are adjustable during operation of the fan, each blade (5) is, through a blade shaft (7) connected to a hub (1) designed as a compact unit.
The blade shaft (7) and an axial thrust bearing device (9) on which the blade (5) is journalled in such a manner that it can, through a control mechanism, be pivoted about its axis for controlling the blade angle, are retained axially in a bearing housing (8) screwed into a threaded bore (18) in the periphery of the hub (1).
For adjusting the radial distance between the periphery of the hub (1) and the blade tip the thrust bearing device (9) is held against a closed end of the bearing housing (8) by a spring (43) and a nut (14) screwed onto a threaded portion (15) of the blade shaft (7) and lockable in an arbitrary position by a lock screw (16).

REFERENCES:
patent: 1908894 (1933-05-01), Findley
patent: 1927592 (1933-09-01), Lambert
patent: 2023785 (1935-12-01), Hoover
patent: 2080540 (1937-05-01), Isaac
patent: 2460910 (1949-02-01), Sheets et al.
patent: 2473899 (1949-06-01), Murphy
patent: 2664961 (1954-01-01), Goedo
patent: 2793702 (1957-05-01), Cushman
patent: 2801793 (1957-08-01), Kline
patent: 4281966 (1981-08-01), Duret et al.
patent: 4619586 (1986-10-01), Carter

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