Improvements in Rotary Fans and Pumps.
Year: 1898

page_text: Improvements in Rotary Fans and Pumps.
I, SAMUEL CLELAND DAVIDSON, of Sirocco Engineering Works, Belfast, Ireland,
Merchant, do hereby declare the nature of this invention to be as follows:
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My improvements relate to rotary fans and pumps and more particularly to
those in which the fluid operated on is taken in centrally and discharged circum-
ferentially, and in which the vanes or blades overhang considerably on one or
both sides of the arms or disc on which they are mounted; and the objects of my.
invention are to provide means whereby the overhanging ends of said blades can
be so adjusted that when the fan or pump is in motion it revolves in and is
rigidly held to a true circle, with a minimum of obstruction to the flow of the
fluid through the fan or pump.
In carrying my invention into effect, the overhanging ends of the blades of
the fan or pump are connected together by preferably an encircling ring or band
(hereinafter referred to as the ring) with attachments thereon at suitable intervals
for wire or other stays (hereinafter called the stays) which extend therefrom to
correspondingly located attachments, or suitable devices for this purpose, around
The inner
or in the boss of the disc, or arms, on which the blades are mounted.
ends of the stavs are firmly attached to the boss by screwing in or otherwise, and
their outer ends are preferably passed through holes in the attachments on the
ring, and screwed for nuts to be mounted thereon, by the tightening up of
which the stays are put into more or less tensile strain, as may be necessary to
draw the ring into accurate adjustment.
J. C. MEWBURN & ELLIS.
55 and 56, Chancery Lane, London,
Chartered Patent Agents..
Improvements in Rotary Fans and Pumps.
I, SAMUEL CLELAND DAVIDSON, of Sirocco Engineering Works, Belfast, Ireland,
Merchant, do hereby declare the nature of this invention and in what manner the
same is to be performed to be particularly described and ascertained in and by
the following statement:-
-
My improvements relate to rotary fans and pumps and more particularly to
those in which the fluid operated on is taken in axially and discharged circum-
ferentially, and in which the vanes or blades overhang considerably on one or
both sides of the arms or disc on which they are mounted; and the objects of my
invention are to provide means whereby the overhanging ends of said blades can
be so adjusted that when the fan or pump is in motion it revolves in and is
rigidly held to a true circle and is rendered capable of withstanding the powerful
Dinn

page_text: strains developed by centrifugal force when the fan is revolving at high velocities
with a minimum of obstruction to the flow of the fluid through the fan or pump.
In carrying my invention into effect, the overhanging ends of the blades of
the fan or pump are connected together by preferably an encircling ring or band
(hereinafter referred to as the ring) with attachments thereon at suitable intervals
for wire or other stays (hereinafter called the stays) which extend therefrom to
correspondingly located attachments, or suitable devices for this purpose, around
or in the boss of the disc or arms on which the blades are mounted. The inner
ends of the stays are firmly attached to the boss by screws or otherwise, and
their outer ends are preferably passed through holes in the attachments on the
ring, and screw threaded for nuts to be mounted thereon, by the tightening up of
which the stays are put into more or less tensile strain, as may be necessary to
draw the ring into accurate. adjustment.
In the accompanying drawings,—
Figure 1 is a sectional elevation on line A B of Figure 2 of a rotary fan or
pump constructed in accordance with my invention.
Figure 2 is an end elevation of the fan or pump as seen from the left hand
of Figure 1.
C
a a are the blades and b is the disc to which they are fixed at one end; the
disc b is carried by a boss or centre piece c keyed on the shaft d. As the blades a a
are of considerable axial length, they therefore overhang the supporting disc b to
an equivalent extent.
For the purpose of imparting the requisite strength and rigidity to said
blades, to resist the centrifugal force to which they are subjected when revolving
at high speeds, the overhanging ends are connected together by an encircling ring
or band e and upon this ring. are mounted bracket attachments f at suitable
intervals for the attachment of wire or other stays g, leading therefrom to corre-
spondingly located attachments h around the projecting end or apex of the
boss c as shown. The outer ends of the stays 9 are preferably passed through
holes in the bracket attachments f on the ring e and a are screwed. at the ends
for nuts to be mounted thereon. The inner ends of the stays g are attached as
tangents to and around the end of the boss c preferably by screws h, through eve-
holes formed in the ends of the stays g, and which are attached to the side of
the boss c. The tightening of the nuts i on the outer ends of the stays 9 puts
said stays into more or less tension as required to draw the ring e into true central
adjustment relatively to the axis of the fan, and when the fan is driven at high
velocities the effect of the centrifugal force developed thereby upon said blades,
is counteracted by the tensile strain of the stays 9 acting on the ring e.
C
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is;
-
In rotary fans and pumps in which the fluid operated on is taken in axially
and discharged circumferentially, and in which the vanes or blades are so mounted
upon a disc or upon arms as to considerably overhang therefrom, the employment
of wire or other stays in tensile strain between the central part or boss of the
disc or arms carrying the blades, and a ring, band, or other suitable device-
connecting the overhanging ends of the blades to one another, the degree or
amount of the tensile strain of the stays being capable of adjustment so that
the overhanging ends of the blades can be drawn into a truly revolving circle,
all substantially as and for the purpose set forth.
Data L
T1 1000
J. C. MEWBURN & ELLIS,
55 and 56, Chancery Lane, London,
Chartered Patent Agents.