Improvements in Centrifugal Blowers.
Year: 1894

page_text: Date of Application, 3rd Jan., 1894-Accepted, 3rd Mar., 1894
COMPLETE SPECIFICATION.
Improvements in Centrifugal Blowers.
I, GARRETT WALLACE POOLE, of 28 Arch Street, Newark, County of Essex
and State of New Jersey, U.S.A., Builder, do hereby declare the nature of my
invention, and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:—
The object of this invention is to provide a blower, simple, strong and durable in
construction, great in efficiency and of such character, that centrifugal force,
suction force and (what I term) scooping force are combined or united in their
actions, and thus give the best possible results.
The invention consists in the improved blower, its revolving drum, the arrange-
ment and construction of a series of passages or chambers in said drum, in
combination with their inlets and outlets; it further consists in the peculiarly
constructed shell and its outlets, and in the arrangement and combination of the
various parts, substantially as will be hereinafter more fully described and finally
embodied in the clauses of the claims.
In the accompanying drawings,
Fig. 1 is a side elevation of my improved blower, with certain portions broken
away; Fig. 2 is a front elevation of the same;
Fig. 3 represents in side elevation, partly sectioned, a modified form of the
blower and
Fig. 4 is a detail sectional view, illustrating the substantially air tight joint or
connection between the blower casing and the revolving drum.
In said drawings e represents a shaft, adapted to be revolved by means of pulleys o
To said shaft is secured a
in bearings d, arranged on the sides of the shell a.
spider f, supporting the revolving drum of the blower, constructed in a manner
hereinafter more fully described.
The relative position of said drum and the stationary shell or chamber a, is such,
that channels n, n³, conical in cross section, are formed between said drum and the
inner surface of the stationary chamber. The wider parts of said channels
terminate in the outlets b and c, as clearly shown in Fig. 1, while in the construction
shown in Fig. 3, the drum is arranged concentrically in the blower casing a, which
latter is provided at the mouth of its outlet opening c with an inwardly extending
projection a'; the diameter of the channel n¹ formed between the drum and the
shell is uniform except at the projection a', where it gradually decreases.
The drum of the blower consists of the side plates hand h³, between which is
arranged a series of metal strips or partitions i (see Figs. 1 and 2) forming channels
or passages k, and are curved in such a manner, that the outlet openings m of
said channels are smaller or about equal to the inlet openings m², as clearly shown.
Said outlet openings m are normal to the periphery of the proceeding channel.
In Fig. 3 of the drawings, the drum consists of the side plates and h', and the
curved partition plates 2, the inner portions of which are bent to come in a plane
radial to the center of the drum. In that construction, the outlet openings m¹ of
the channels or chambers k¹ are arranged in the same plane as the inner portions 2³
of the partition plates, that is to say, radial to the center of the drum.
The side plates h and h' are at each of the openings or outlets m (or m') notched,
by which construction the suction force is allowed to act directly upon the said
outlets, as will be hereinafter more fully described.

page_text: The partition plates (Fig. 1) may be provided with inner extensions, pro-
jecting a short distance within the inlet openings g of the shell, and assist, when
the drum is in rotation, in scooping the air into the channels or passages k.
To the outside of the sides plates and h¹ are secured metallic rings p projecting
through the inlet openings g and bearing against a ring 7 on said shell a (secured
thereto by bolts or rivets r)-or the said ring p may extend through the inlet
openings g and bear against said ring and with a projecting portion p¹ extend
through the same, as clearly shown in Fig. 4 of the drawings.
The operation is as follows: When the drum is revolved in the direction of the
arrow R, air is scooped into the inlets m² of the passages, by the extensions from
the openings g, and is thrown by centrifugal force through the outlets m (or m¹ in
Fig. 3) of said passages into the stationary chamber or shell a.
Simultaneously the vacuum formed at the said outlets m (or m¹ in Fig. 3) of the
drum, produces a suction in the passages and thus assists the centrifugal force in
conducting the air from said passages into the said chamber u. From the foregoing
description it can be seen, that three forces are acting at one and the same time
upon the air in the openings and in the passages of the drum :-scooping,
centrifugal and suction force, the air by being discharged in the direction of the
arrow to, impinges upon the inner side of the shell a, and owing to the peculiar
relative position of the periphery of the drum to the inner surface of said shell,
practically assists the rotation of the drum and thus reduces the power necessary
to rotate the same.
I do not intend to limit myself to the precise construction shown and described
as various alterations can be made without changing the scope of my invention.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim, is:
1. The combination in a blower, of a stationary casing provided with approxi-
mately central openings, with a drum adapted to be revolved in said casing and
consisting of side plates provided with central openings registering with the
central openings of the casing, and a series of curved uniform shaped channels
formed between said plates by curved partition plates, and extending from the
central opening of the drum to the outer periphery thereof, the outlet end of each
curved channel being approximately normal to the periphery of the next proceeding
curved channel, substantially as described.
2. A. casing for a blower having upper and lower tangential outlets, being the
continuation of channels, conical in cross section and surrounding the periphery of
the revolving drum, placed in the casing, substantially as described.
3. The combination in a blower, of a casing having upper and lower tangential
outlets being the continuation of channels (conical in cross section) and surrounding
the periphery of a drum adapted to be revolved in said casing, with said drum
consisting of a series of curved channels, extending from the central opening of the
drum to the outer periphery thereof, substantially as described.
4. In a blower, the combination of the revolving drum, with a stationary chamber
arranged concentrically around said drum and provided with an outlet, said casing
being also provided at or about the mouth of said outlet with an inwardly extending
projecting (a), substantially as described.
5. The method or process of creating a suction within a blower casing, which
consists in rapidly revolving therein, a series of curved channels, the outlet of each
channel being approximately radial to the next proceeding channel, substantially as
described.
6. In a blower, the combination of the shell provided with centrally located
openings and with an outlet, with a drum adapted to be revolved in said casing
of a series of partition plates forming chambers or channels, the inner por-
tions of said partition plates are arranged radially to the center of the drum,

page_text: while the outer portions are curved in such a way, that the outlet openings of the
chambers or channels are in line with the radially arranged portions of the partition
plates, substantially as described.
Dated this 2nd dox of January 1894
J. P. BAYLY,
18, Fulham Place, W., Agent for the Applicant.