US2224617A

US2224617A - Rotary dust separator impeller

Info

Publication number: US2224617A
Application number: US204507A
Authority: US
Inventors: Sylvan Stig G Son
Original assignee: American Air Filter Co Inc
Current assignee: American Air Filter Co Inc
Priority date: 1936-04-07
Filing date: 1938-04-27
Publication date: 1940-12-10
Anticipated expiration: 1957-12-10

Description

D ec. 10, 1940. sTlG G=soN sYLvAN 21,224,617

ROTARY DUST SEPARATOR IMPELL'ER A Original Filed April 7, 1936 l :ny am @www1/701e y @WL/WM fm2/yf? Patented Dec. 10, 1940 UNITED sTATEs PATENT OFFICE to American Air Filter Company, Inc., Louisville, Ky., a corporation of Delaware Original application Api-ii mismas, serial No.

73,142. Divided and this application April 27,

1938, Serial N0. 204,507

1 Claim.

This invention relates to improvements in impellers for rotary dust separators of the character described in my copending application Serial No. '13,142 of which this is a division.

The principal object of the invention is to simplify the structural design and reduce the manufacturing cost of impellers for rotary dust separators.

The invention is illustrated in the accompanying drawing, wherein:

Figure 1 is a front elevation of an impeller constructed in accordance with my invention;

Figure 2 i-s a side view thereof with the lower half in section and the upper half in elevation;

and

Figure 3 is a rear elevation.

The illustrated impeller, which is iixedly secured to a rotatable drive shaft 2, includes a conically shaped hub 3, an annular disc I, a.

series of blades 5 and a band 8. The hub I is xedly secured to the shaft 2 while the annular disc 4 is similarly secured to the hub 3 and arranged to extend radially therefrom. The annular voutward pull exerted on the disc, as a result of its rotation, increases from its periphery inwardly to its points of securement to the hub. Accordingly it is desirable to increase the thickness of the dise from its periphery inwardly in order vto provide the requisite strength and at the same time keep the weight of the disc at a minimum. Heretofore the disc-has been cast in such form. In accordance with this invention the same result is achieved in a simpler manner and'at less expense by riveting or otherwise securing together a requisite number of plates of different outside diameters. The vnumber of plates used will depend upon the strain to be encountered and the thickness of each plate. For the most part three to five plates of suitable thickness have been found sufficient for a wide range of impeller speeds and diameters but a different number may of course be used as the occasion may require. With three plates of dierent diameter the strain in the outer section of the dise is carried by the largest plate, in the intermediate section thereof by the two larger plates and in the inner section by all three. The plate of largest diameter is preferably placed on (Cl. E30-134) the air flow side of the disc as a whole in order to provide a at seating surface for the blades 5.

The blades 5 are fixedly secured to the disc and arranged to project laterally therefrom across the air flow. While the blades may be shaped 5 and arranged as desired. they are shown as of flat shape and of straight radial arrangement. The blades also should be inclined to the disc in such manner as to cause particles precipitated on them during rotation to move toward that 10 side of the air flow from which the particles are to be removed. In the structure illustrated the particles are to be removed from the disc side of the air flow and consequently the blades are in clined forwardly across the air fiow from the disc 15 4 to the band 6 so that the band edges of the blades lead the'dsc edges thereof in the direction of rotation.

The band 6, which is secured to the adjacent side edges of the blades, operates to stiiien the 20 blade structure Ias a whole. It has also been found to improve the blower characteristics of the device and for that reason is made wide enough to cover the side edges of the blades completely from their inlet to their outlet edges. 25 In this character of device, it is desirable that the flow area at the outlet edges of the blades be not greater and preferably smaller than the area at the inlet edges thereof. For that reason the band is made cone shaped and arranged 30 to approach the disc as it extends outwardly so as to produce an outwardly converging centrifuging passage, the slope of the band depending upon the inlet-outlet area ratio desired.

I claim:

An impeller of the class described comprising: a hub having a securing flange; a unitary annular disc iixedly mounted on said hub against said ange, said disc being composed of a series of at least three plates of different diameters o arranged in face-to-face relation and secured to said flange and to each other, the diameters of said plates progressively decreasing in one direction from the largest plate of the series to the smallest plate thereof; and a series of fluid- 45 propelling blades xedly secured torsaid disc.

STIG G: SON SYLVAN.