Fluid reaction surfaces (i.e. – impellers) – Having positive means for impeller adjustment – Motor bodily rotatable with impeller hub or shaft
Patent
1984-07-19
1986-10-28
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
Having positive means for impeller adjustment
Motor bodily rotatable with impeller hub or shaft
416167, F04D 2936, B64C 1138
Patent
active
046195866
ABSTRACT:
A low profile, externally controlled, variable pitch fan blade hub assembly is disclosed which is especially useful in high humidity environments such as are encountered in the fan induced, hot air discharge section of an industrial water cooling tower. The hub housing has central hub means including a member which is telescoped over the drive shaft therefor to limit the overall height of the assembly. The hub member is biased axially of the hub by a series of peripherally located springs contained within the housing. A fluid such as air may be introduced into the housing under pressure to shift the hub unit in a direction against the spring bias thereon. The housing has a plurality of radially extending bores each of which rotatably receives a respective fan blade axle provided with an elongated arm on the innermost end thereof within the housing positioned such that a cam follower on each arm is received in a cam track forming a part of the hub unit. As the hub unit shifts in the housing in response to introduction of pressurized fluid or release of fluid from the housing, concomitant swinging of the cam follower arm rotates the blade axles to simultaneously vary the pitch of the fan blades. Recessing of the hub unit springs in the housing and the use of a plurality of such springs around the circumference of the hub unit assures uniformity of spring bias on the hub unit without impairment of the moisture sealing integrity of the hub housing.
REFERENCES:
patent: 2054810 (1936-09-01), Gaba
patent: 2392341 (1946-01-01), Squier
patent: 2826395 (1958-03-01), Petty
patent: 3967916 (1976-07-01), Chittom
patent: 4019792 (1977-04-01), Monroe
patent: 4221541 (1980-09-01), Bianchi
Powell Jr. Everette A.
The Marley Cooling Tower Company
LandOfFree
Externally controlled variable pitch fan hub assembly does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Externally controlled variable pitch fan hub assembly, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Externally controlled variable pitch fan hub assembly will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1343920