Improvements in Rotary Blowers or Exhausters.
Year: 1899

page_text: Date of Application, 11th Apr., 1899-Accepted, 2nd June, 1899
COMPLETE SPECIFICATION.
Improvements in Rotary Blowers or Exhausters.
I, THOMAS WILBRAHAM GREEN, of No. 2007, East Allegheny Avenue, in the
City of Philadelphia, State of Pennsylvania, United States of America, Factory
Superintendent, 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 invention relates to rotary pressure blowers or exhausters, and the object
of my improvement is to construct a blower that will have a maximum capacity
with a minimum expenditure of power and at the same time discharge the fluid
acted upon in a steady and regular stream free from any pulsation. To accomplish
the desired result I construct the blower with a single impeller that is open at
both ends and has therein intake and discharge ports separated by an intervening
web portion, one end of said impeller communicating with the intake and the
opposite end of the impeller communicating with the discharge opening in the
blower.
In the accompanying drawing Figure 1, is an end elevation of my improved
blower. Figure 2, is a horizontal sectional view of the blower on line 22 of
Figure 1. Figure 3, is a vertical sectional view on line 3-3 of Figure 1.
Figure 4, is a vertical sectional view on line 3-3 of Figure 1, but
with the impeller turned about one eighth of a revolution further around in the
direction indicated by the arrows. Figure 5, is a horizontal section on line 5-5
of Figure 3. Figure 6, is a vertical section on line 6-6 of Figure 3.
A, represents the outer casing surrounding the working parts of the blower.
A', A', are the two end plates enclosing the ends of the blower and forming sup-
ports for the driving shafts. B, is the impeller located in the middle or central
part of the blower and provided with two extending wings or blades a, a¹. The
forward ends of these extending wings or blades conform to the curve of the
inside of the outer casing A, and sweep the air therefrom into and through the
discharge ports. C, C, are two spiral intake ports or ways extending inwardly
from the intake end of the impeller and opening into the space enclosed by the
outer casing A. C, C, are two spiral discharge ports in the impeller, similar to
the intake ports but opening outwardly and extending from the inside of the
impeller to the end opposite from the intake. c, c, are two spirally formed webs
connecting the central part of the impeller with the outer circular part and
separating the intake and discharge ports. b, b, and 61, 6, are four extensions
formed on the impeller. In the position shown in Figures 3 and 4; the outer
surfaces of the extensions band bi, are made to conform to the curves described
by the corners or angles of the semi-circular depressions in the revolving cut off
valves and thus form a lock or cut off until such times as the outer circular
surfaces of the revolving cut offs, and the circular surfaces on the impeller meet.
12, is the driving shaft of the impeller; D, D', are two revolving valves or cut
offs, extending from end to end of the blower on opposite sides of the impeller B,
and parallel therewith. d, d', are the driving shafts of the revolving cut off
valves D, D¹. d², d², are semi-circular depressions formed in the revolving cut off

page_text: valves and are made to conform to the sweep of the impeller wings a, a¹. E, is
the driving pulley on the shaft of the impeller. E, E, E, are gear wheels on the
ends of the driving shafts of the impeller and revolving cut off's respectively.
F, F, are two circular depressions or chambers formed in the two end plates A¹, A',
around the driving shaft 12, and communicating with the open ends of the
impeller. d³, d, d, are journal boxes for the driving shafts. A3, is the base
portion of the blower underneath and outside of the casing A. a², is a partition
extending diagonally across the base portion A, and dividing it into the two
triangular apartments 62, and 3, particularly shown in Figure 5. a³, at, are
rectangular channels or ways in the end plates A', extending from the circular
depressions F, F1, to and communicating with the triangular compartments b²,
and 6 B1, is the intake communicating with the compartment, and B², is the
discharge opening communicating with the compartment 63.
The several parts of the blower being constructed and arranged as shown and
a driving belt secured upon the driving pulley E, the operation of the machine is
as follows:-The movement of the driving pulley E, operates the impeller and
gear wheels E, 12, and E, the impeller moving in the direction indicated by
the arrows in Figures 3 and 4; this movement of the impeller will cause the air to
flow in through the intake 1, into the chamber 2, and the passage way a³, filling
the circular depression or chamber F, from whence it passes through the intake
ports C, into the space C2, inside of the casing of the blower, from there it passes
or is forced outwardly through the spiral discharge ports C, of the impeller into
the circular depression or chamber F1, out through the passage or channel 4,
into the triangular chamber 63, and out at the discharge opening B. The intake
openings in the one end of the impeller, being at all times in communication
with the chamber F, and the intake channels or ways that lead to the open air
and the discharge opening at the opposite end of the impeller being at all times in
communication with the chamber F, and the discharge orifice, a continuous stream
of air is pumped into and discharged out of the blower, free from any pulsation
or variation. The revolving cut off valves D, D', prevent the air from being
forced backwardly or churned around with the wings of the impeller.
Instead of making the intake ports C, and the discharge ports C, spiral in
form they may be straight if desired. The depressions or chambers F, F, in the
end plates A, A', may be of any convenient shape and need not extend all of the
way around the shaft of the impeller, but they must be large enough to permit the
incoming and outgoing air to pass freely through them."
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. A rotary blower having the impeller thereof provided with an intake and
a discharge port, said intake and discharge ports opening into opposite ends of
the impeller and separated from each other by an intervening web portion, the
intake port registering with a chamber that communicates with the intake opening
and the discharge port registering with a chamber communicating with the dis-
charge opening, substantially as and for the purpose set forth.
2. A rotary blower having the impeller thereof provided with intake and dis-
charge ports that communicate with each other through the space enclosed by
the casing surrounding the blower and separated from each other by an inter-
vening web portion; the intake port opening into one end of the impeller and
registering with an inlet at the end of the blower and the discharge port on the
opposite end of the impeller registering with a discharge opening, substantially
as shown and for the purpose described.
3. A rotary blower having therein a single impeller open at both ends and
provided with two ports or channels extending inwardly in opposite directions from
the ends, being separated from each other by an intervening web portion; one of
said ports registering with a chamber connected with the intake and the other

page_text: of said ports opening into a chamber communicating with the discharge opening,
substantially as shown and for the purpose described.
4. In a rotary blower, the impeller B, having therein inlet and discharge ports
extending from the inner part of the impeller to opposite ends thereof and separated
by an intervening web portion and the inlet opening F, communicating with the
intake and the outlet opening F1 communicating with the discharge in combination
with the revolving cut offs D, and D¹, located on opposite sides of the impeller and
parallel therewith, substantially as shown and for the purpose described.
5. In a rotary blower the impeller B, having therein an inlet and a discharge
port extending from the inner part of the impeller in opposite directions to the
ends of said impeller and separated by an intervening web portion, in combination
with the inlet chamber F, passage way a³, chamber 2, intake opening B', the
chamber F, passage way a, chamber 6, discharge opening 132, and the revolving
cut off valves D, and D, all arranged, substantially as shown and for the purpose
described.
Dated the 11th day of Anril 1899.
PHILIP M. JUSTICE,
Chartered Patent Agent, London,
For the Applicant.