Improvements in Rotary Exhausters or Pumps for Gas and other Fluids.
Year: 1887

page_text: Date of Application, 4th July, 1887.
Specification Accepted, 5th Aug., 1887
COMPLETE SPECIFICATION.
Improvements in Rotary Exhausters or Pumps for Gas and other
Fluids.
I, GEORGE BLACKWELL of No. 139 St. Leonard Street, Bromley-by-Bow, in the
county of Essex, Machinist 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 :-
The improved apparatus according to my Invention is devised primarily for
relieving the pressure from gas retorts, and forcing the gas into the delivery pipes.
Among the disadvantages inherent to many types of rotary exhausters or pumps
as hitherto constructed may be mentioned the inability to utilise the whole capacity of
the apparatus and it is with a view to overcome this disadvantage as also to obtain
increased power that the contrivance in accordance with my Invention is devised.
In order that my Invention may be the better understood, I have appended the
accompanying sheet of drawings in which :-Figure 1 is a sectional elevation of the
improved exhauster or pump and Figure 2. is a transverse section of the same drawn
through line A B Figure 1., like letters of reference being used to denote corresponding
parts in the various views.
My improved exhauster or pump comprises an elliptical drum or chamber A, herein-
after more fully referred to, contained in a cylindrical enclosing case B, which latter
is provided with three narrow chambers d. d. d. equidistant from each other, for the
reception of the slides or valves E. E. E., an elevational plan of one of which
latter is shown at Figure 4. To each end of the cylinder B is attached a chamber H.
furnished with suction and delivery pipes h. The elliptical drum A. (the transverse
diameter of which is two thirds that of the diameter of the enclosing cylindre B)
FAR

page_text: is divided in the centre by a web or diaphragmn into four parts A. A¹. A". A
and has at each end a hollow spindle or neck C, forming part of the chamber A. The
hollow neck pieces or spindles C. are pierced as shewn with three ports b...
Figures 1 and 5, the combined area of which ports equals the internal area of the
suction and delivery pipes. Said hollow spindle C. is provided at each end with solid
extension pieces . revolving in suitable bearings K, on to one of which ends
may be keyed a suitable pulley m. for the reception of a belt or other means of
imparting motion to the device. Within the recesses d. d'. d, before referred to are
the three slides E. E'. E", slotted on their inner edges, and in which slots are
inserted the tongue pieces C. C. C. Figures 2 and 4., which latter by means of bow
springs e. introduced at the back thereof, cause each of said tongue pieces c. to press
equally in its length upon the smooth face of the elliptical chamber A. The tongue
pieces c. c. c. above referred to are narrow plates of steel or other suitable bard
metal, formed with semicircular contact bearing pieces j. j. j. as shown at Figures 2
and 4. Into the ends of said slides E. E. E are countersunk the slips g.g.g"
carrying at their extremities, small runners f... Figure 3 and 4, which latter
take into an elliptical groove or channel i. formed on the ends of the elliptical drum
or chamber A. as shown at Figure 3, thus imparting to said slides or valves by
reciprocating motion during the rotation of the chamber A. Said slips g.gg.
also prevent any displacement of the tongue pieces c. cl. c¹¹ aforesaid. The hollow
drum or chamber A is also provided at n. n' with slips or plates of steel or other
hard metal to serve as contact bearing pieces to ensure a thorough closure, and
thus prevent the possibility of leakage during the passage of said bearings over the
tongue pieces j.j.j". aforesaid.
•
Assuming now in reference to the above described apparatus, the elliptical drum A.
to be revolving in the direction of the arrow, and the position to be as shown in
Figure 2. the port a". will have just commenced to discharge or deliver the
gas or other fluid from the interior of the revolving chamber A., whilst the port a'
is in full discharge and the port a. has completed its discharge. Simultaneously
with the port a commencing to discharge, the port a commences the work of
suction or exhausting, which is immediately followed by the port a., which in its
turn takes up the work of suction; then, when the port a. commences to discharge,
the port a. is in position to commence exhausting; followed immediately after by
the port a. It will be seen therefore, from the above description, that there are
no dead points, and that the full capacity of the machine is utilised, and further,
that the combined areas of the three ports b. b. 6. of the hollow spindles C. being
equal to the internal area of the suction and delivery pipes, it follows, that there can
be no compression.
Referring further to the runners f.ff. Figures 3 and 5 working in the channels i.
it will be seen that the slides or valves E. E'. E". are kept at a constant distance, and,
aided by the springs e.e at the back of the tongue pieces c. c before described, a very
perfect frictional contact with the elliptical face of the drum or chamber A is obtained,
thus effectually preventing any loss by leakage, at the same time that the slides take
all the pressure, a matter of the greatest importance when the apparatus is used as a
pump for raising and delivering water or other liquids for which purpose the device
according to my Invention is well adapted.
A special feature of the device constructed and arranged in the manner above
described in accordance with my Invention is that, when at work, it performs its
functions with equal facility irrespective of the direction in which the elliptical drum
or chamber A may be rotated.
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 :-
Firstly. The improvements in rotary exhausters or pumps, substantially as and for
the purposes herein set forth and shown in the accompanying drawings.
Secondly. In a rotary exhauster or pump, the elliptical drum or chamber A rotating
centrally relatively to the enclosing casing B, divided by a diaphragm D into four

page_text: portions, each of which latter having a port or opening substantially as and for the
purposes herein set forth.
Thirdly. In the device hereinbefore described, the method of and means adopted for
actuating the slides E. E' E". as shown more particularly in Figure 3. substantially as
and for the purposes herein set forth.
Fourthly. In a rotary exhauster or pump the application of the slides E. E¹. E",
the tongue pieces c. c. and springs e. e. substantially as and for the purposes herein
set forth.
JAMES STEVENSON,
Gray's Inn Chambers,
20, High Holborn, London, W.C.,