Improvements in Rotary Exhausters that may be used as Pumps, Engines, or Meters.
Year: 1891

page_text: Date of Application, 28th Nov., 1891
Complete Specification Left, 26th Aug., 1892-Accepted, 15th Oct., 1892
PROVISIONAL SPECIFICATION.
Improvements in Rotary Exhausters that may be used as Pumps,
Engines, or Meters.
I, EDWIN BRYAN DONKIN, of Southwark Park Road, Bermondsey, in the
County of Surrey, Engineer, do hereby declare the nature of this invention to be
as follows:
In rotary exhausters pumps engines and meters of the general type in which an
axle or drum is arranged eccentrically within a cylinder or casing and is adapted
to rotate therein, and is furnished with a slide or piston or slides or pistons adapted
to travel in contact with the interior of the cylinder or casing (as for example is
the case in what is known as Beale's exhauster) the action is variable depending
upon the different positions of the rotating slide or piston or slides or pistons in
relation to the inlet and outlet of the cylinder or casing; and the space occupied by
the axle or drum is wasted.
Now my invention is to obviate these drawbacks, and it consists for this purpose
in constructing within the axle or drum a fluid tight chamber which may be
of rectangular form and is fitted with a piston or pistons connected to the slide or
piston or slides or pistons first mentioned the arrangement being such that
as the axle or drum rotates a reciprocating movement of its contained
piston or pistons in relation to the chamber that encloses it or them will take
place. This chamber is placed by suitable ports in communication at the
proper times through suitable passages with the interior of the main cylinder or
casing near its inlet and outlet, and thus the machine is made more efficient and
practically uniformn instead of being more or less intermittent in action.
Dated this 27th day of November 1891.
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Rotary Exhausters that may be used as Pumps,
Engines, or Meters.
J, EDWIN BRYAN DONKIN, of Southwark Park Road, Bermondsey, in the
County of Surrey, Engineer, do hereby declare the nature of this invention and in
what manner the same is to be performed to be particularly described and ascer-
tained in and by the following statement :-
In rotary exhausters, pumps, engines and meters of the general type in which an
axle or drum is arranged eccentrically within a cylinder or casing and is adapted to
rotate therein, and is furnished with a slide or piston or slides or pistons adapted to
travel in contact with the interior of the cylinder or casing (as for example is the
case in what is known as Beale's exhauster) the action is variable depending upon
the different positions of the rotating slide or piston or slides or pistons in relation
to the inlet and outlet of the cylinder or casing, and the space occupied by the axle
or drum is wasted.
Now my invention is designed to obviate these drawbacks, and it consists for this
purpose in constructing within the axle or drum a fluid tight chamber which may be
of rectangular form and is fitted with a piston or pistons connected to the slide or
piston or slides or pistons first mentioned and hereinafter called for distinction a
slide or slides, the arrangement being such that as the axle or drum rotates a
reciprocating movement of its contained piston or pistons in relation to the chambe:

page_text: that encloses it or them will take place. This chamber is placed by suitable ports
in communication at the proper times through suitable passages with the interior of
the main cylinder or casing near its inlet and outlet ports and thus the machine is
made more efficient and practically uniform instead of being more or less
intermittent in action.
In the accompanying illustrative drawings,
Fig. 1 is a central cross-section,
Fig. 2 a longitudinal section, and
Fig. 3 a transverse section on the line ay of Fig. 2 of an exhauster constructed
according to this invention.
In the
A is the cylinder or casing of the exhauster within the end walls.B B' of which
is mounted the eccentrically arranged axle or drum C provided with a driving
shaft C and carrying the slide D that extends through the axle or drum and
closely fits the sides and inner periphery of the cylinder or casing. E is a pin fixed to
the end wall B and upon which is journalled the guide block E' that fits between
extensions D of the slide D and serves to reciprocate this slide relatively to the
axle or drum during the rotation of the latter, in a manner well understood. The
axle or drum C is according to this invention formed with an internal chamber F
fitted with a piston that is, in the example shown, formed by extending the
transverse parts D₁ of the slide D and providing them at their outer ends with
packing pieces D2 that fit against, and so as to ensure a fluid tight joint with, the
inner surface of the chamber F which for this purpose is made smooth.
example shown, the chamber F is of rectangular form in cross section and the axle
or drum is provided with a removable part C² to admit of the insertion of the piston.
In the end wall of the axle or drum C next the wall B' are formed two pairs of
ports, viz. G G and GG, and the said wall B is formed with two chambers H, H'.
I is a port by which the chamber H is placed in permanent communication with
the inlet branch K, and I¹ is a similar port by which the chamber H¹ is placed
in permanent communication with the delivery branch K. L L' are ports formed in
the end wall B and by means of which the chambers H H are placed alternately in
communication with the chamber F by the ports G or G'in the end wall thereof in the
manner hereinafter described. M M are inlets for lubricant. O, O are openings
whereby the two portions of the chamber at one side of the piston and at opposite
sides of the slide D are placed in communication with each other, and 0' 0¹ are
similar openings for placing the other portions of the chamber at the opposite side
of the piston in communication with each other.
With the construction described, when the axle or drum C is revolved by its
spindle C the slide D will be caused by the action of the pin E and guide block E¹ to
slide to and fro in a transverse direction through the drum or axle so that the outer ends
thereof will be kept at all times in close contact with the interior of the cylinder
or casing A in a manner well understood. The piston D' will consequently be
caused to reciprocate within the chamber F.
Assuming the parts to be in the positions shown in Fig. 1 and that the axle or
drum is rotating in the direction of the arrow a, then as the piston D' moves in the
direction of the arrow b, fluid will be caused to enter the chamber F within the
axle or drum from the inlet branch K by way of the port I chamber H and ports 1.
and G whilst the fluid at the opposite side of the piston will be forced by the
piston to the delivery branch K by way of the ports G and L', chamber H' and port I'.
When the piston D¹ moves in the reverse direction, the ports G and G' will have
changed places relatively to the inlet and outlet ports L and L', so that liquid will 5
now enter the chamber at the other side of the piston through the ports G whilst
that previously drawn in through the ports G' will be discharged through the
port L to the delivery branch. By this means the exhauster is rendered more
efficient and the delivery made practically uniform.
Fig. 4 is a sectional view illustrating the application of my invention to an 5
exhauster of the kind described in the Specification of Gwynne & Beale's Patent
No. 3449 of 1871. In this case there are two slides D D* that work in contact

page_text: with each other and each of which according to this invention is provided with a
projecting portion D₁ that forms a piston arranged to work in one half of the
chamber F to and from which fluid is caused to flow through ports and passages
formed in the end of the axle or drum C and adjacent end wall in the manner
hereinbefore described.
•
Fig. 5 is a similar view to Fig 4 illustrating the application of my invention to
an exhauster of the kind described in Beale's Specification No. 1402 of 1866. In
this case there is one slide D which is provided according to this invention with a
piston D arranged to work within the chamber F in the axle or drum in the
manner hereinbefore described.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed 1 declare that what I
claim is :-
1. A rotary exhauster, pump, engine or meter of the type herein referred to, in
which the axle or drum is constructed with a fluid tight chamber that is adapted to
be placed by suitably arranged ports and passages in communication at the proper
times with the interior of the main cylinder or casing near its inlet and outlet
branches and is fitted with a piston or pistons connected to the slide or slides
carried by the axle or drum, the arrangement being such that when the axle or
drum is rotated, the piston or pistons will be caused to reciprocate within the
chamber and cause fluid to enter and leave the same substantially as herein
described for the purpose specified.
2. My improved rotary exhauster constructed and operating substantially as
herein before described with reference to and shown in Figs. 1, 2 and 3 of the
drawings annexed.
Dated this 25th day of August 1892.
EDWIN BRYAN DONKIN.
W. Lloyd Wise,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.