Improvements in Pumps or Propellers for Moving Water or other Liquids, Air, or Gases.
Year: 1895

page_text: Date of Application, 30th July, 1895
Complete Specification Left. 30th Apr., 1896-Accepted, 13th June, 1896
PROVISIONAL SPECIFICATION.
Improvements in Pumps or Propellers for Moving Water or other
Liquids, Air, or Gases.
1, GEORGE MITCHELL of 47 Victoria Street, Westminster, in the County of
London, Consulting Engineer, do bereby declare the nature of this invention to be
as follows:
This invention relates to rotatory pumps, and consists of an improved construction
and arrangement of parts whereby am enabled to utilize both centrifugal and
centripetal force in producing the flow of the water or other fluid through the pump
or propeller. The supply and delivery openings are so arranged as to secure a
flow of water both into and out of the machine in an approximately axial
direction.
My invention admits of many modifications but in its simplest form it consists of
a casing either fixed or revoluble, and containing a disc capable of being rotated
on a spindle. Upon one (the supply) side of the disc are fixed a number of blades
so arranged as to produce a flow in a direction from the axis of rotation. Upon
the other or delivery side of the disc are fixed a number of blades arranged in
such a manner as to produce a flow towards the axis of rotation. The diameter of
the dise is less than that of the casing, and consequently an annular opening or
openings forming part of an annulus, are left between the two; and the water
flowing in from the supply pipe, is forced outwards by the one set of blades, passes
round the edge of the disc, is drawn inwards by the other set of blades, and forced
out through the delivery pipe.
Dated this 30th day of July 1895
WILLIAM J. MUNDEN,
106 Priory Park Road, Kilburn, London, N.W..,
Agent for the Applicant.
CUMI JUIN
· Improvements in Pumps or Propellers for Moving Water or other
Liquids, Air, or Gases.
1, GEORGE MITCHELL, formerly of 47, but now of 39 Victoria Street,
Westminster, in the County of Loudon, Consulting Engineer, 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 :-
This invention relates to rotary pumps and consists of an improved construction
and arrangement of parts whereby I am enabled to utilize both centrifugal and
centripetal force in producing the flow of the water or other fluid through the
pump or propeller. The supply and delivery openings are so arranged as to
secure a flow of water both.into and out of the machine in an approximately axial
direction.
My invention admits of many modificatious but in its simplest form it consists
of a casing either fixed or revoluble, and containing a disc capable of being rotated
on a spindle. Upon one (the supply) side of the disc are fixed a number of blades

page_text: (part section of a pump
Fig. 2 is an end elevation (part section), and
Fig. 3 is a plan of same.
Fig. 4 is an elevation (on an enlarged scale) of the disc used, shewing the outlet
vanes in full and the inlet vanes in dotted lines.
Fig. 5 is a vertical section of same taken on line B, B of Fig. 4.
Fig. 6 is a plan of same.
Fig. 7 is a section of the outlet side of disc taken on line A, A, of Fig. 4.
Fig. 8 is a section of same taken on line A, C.
Fig. 9 is a section of same taken on liue A, E.
Fig. 10 is a section of a modified form of pump.
h
"
The pump casing is composed of two parts, A being the inlet and B the delivery
side; the inlet pipe a is formed integral with A, and the delivery pipe b integral
with the lower part of the latter being extended so as to form a base, which
may be held down by bolts passing through holes &. The two parts A and B form
the sides of the pump and each part has a flange, which flanges meet each other,
and are bolted together by bolts a'. The part B is extended to form a bearing
which is packed by means of a gland 6. The part A is extended so as to include
a bearing a which is of special construction having an adjustable "lignum vitæ
or other resistance block as formed therein; a is an adjusting-screw. In these
two bearings at and runs the shaft C upon which is fixed the revoluble disc D,
and vanes and d; and the shaft C being packed at the gland 61 end and closed at
the bearing a end, the whole of the revoluble parts are thus enclosed in a casing,
access to which is obtainable only through the inlet and delivery pipes a and b.
The shaft C has collars e and c¹ formed integrally with it for the purpose of taking
up the end thrust produced.
The disc D may be of considerably less diameter than the interior of the
casing A, B; thus leaving an annular space all round the edge of the disc for the
passage of the water; but it is preferably formed as shewn in Figs. 2 and 4 with
portions only of the edges cut away to form passages X, through which the water
passes from the inlet to the delivery side of the pump. The inlet side vanes d
bave lips formed integrally with them, and these project into the circular
opening a through which the water enters the casing from the inlet pipe a; the
lips being so shaped as to assist in drawing the water through the opening.
The vanes d are so shaped that in their rotation they force the water outwards in
a direction away from the axis of rotation until it reaches the point e, where the
blades assume curves, by which means the water is made to pass from the inlet to
the delivery side of the disc through the passages X when it is taken up by the
vanes d', and drawn inwardly, or towards the axis of rotation. The boss of the
disc D is curved in such manner as to ensure the least resistance to the flow of
the water, and the disc D, and vanes d and d¹ are so shaped as to ensure the highest
efficiency.
The operation of the pump is as follows:-The casing A being fixed upon the
shaft C and its attached disc being caused to rotate by any convenient means, the
air contained in the casing A and the inlet pipe a is forced out of the delivery

page_text: pipe b, and a vacuum formed in the inlet pipe a. Water is thus caused to ascend
the latter and upon coming into contact with the lips d, is drawn into the casing
through the opening a", and upon entering comes into contact with the exterior
sides of the curved vanes & which (rotating in the direction indicated by the arrows)
force the water outwards until it reaches the opening X, through which it passes
to the delivery side of the pump, where it comes into contact with the interior
surface of the curved vanes d', which in their rotation force it inwardly or towards
the axis of rotation, whence it is forced into the delivery pipe which it ascends.
The Figs. 7, 8, and 9 shew sections of one of the delivery side vanes d' on different
planes, and illustrate the diminishing area of the passages through which the water
passes on its way to the centre; 3,,, and shewing the areas on the different
planes.
The bolts a' by means of which the part A is holted to B may pass through
slots a in one or both of the flanges, thus rendering it possible to adjust the inlet
pipe a at any desired angle in its vertical plane.
Fig. 10 is a longitudinal vertical section of a pump in which the dise D is fixed
and the casing A, B, rotates upon bearings formed upon the ends a', ' of the inlet
and delivery pipes a and b. The sleeves a² and 62 form integral parts of the
sides A and B of the pump casing, and one of these 2 is shewn as so shaped as to
form a pulley upon which the belt runs which rotates the casing. Both the delivery
and inlet pipes are fixed to or form part of the base E, and through holes formed
in bosses and 3, passes the shaft C which is fixed rigidly therein. Formed
integrally with or rigidly fixed to the shaft C is the disc D which is a plain disc
curved at the point where it joins the shaft so as to promote the free flow of the
water. Upon the interior of the inlet side of the casing A are fixed a number of
vanes so shaped as to force the water away from the axis of rotation; and upon the
interior of the delivery side of the casing are fixed a number of vanes B so shaped
as to force the water towards the axis of rotation. I sometimes form the periphery
of the casing A, B, of such shape as to form a pulley by means of which the pump
is operated.
Upon the casing being rotated in the proper direction the water enters by the
inlet pipe a, is seized by the vanes A', and forced outwardly until it passes over
the edge of the dise D, and submitted to the action of the vanes B', which draw it
towards the axis, and force it out through the delivery pipe b.
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 pump or propeller for moving water or other liquids, air, or gases, in which
the flow is produced by one set of blades, or vanes forcing the water in a direction
away from the axis of rotation, and a second set of blades or vanes forcing it in a
direction towards the said axis of rotation, substantially as described and shewn.
2. A pump or propeller for moving water, or other liquids, air, or gases, in which
the water is first moved centrifugally, and afterwards centripetally, substantially in
the manner and for the purpose described and shewn.
3. In a pump or propeller for moving water or other liquids, air, or gases,
the combination of a fixed casing having inlet and delivery pipes, with a disc
revoluble upon or with a central shaft, such disc having upon the inlet side a
number of vanes arranged so as to force the water away from the axis of rotation,
and upon the delivery side a number of vanes arranged to force the water towards
the axis of rotation, substantially as shewn and described.
4. In a pump or propeller for moving water or other liquids, air, or gases, the
combination of the casing A, B, the inlet pipe a, the delivery pipe b, the revoluble
shaft C, the disc D having curved vanes and d', and lips dx attached to it, and
the openings X, which allow the water to flow from the inlet to the delivery side
of the pump, substantially as described and shewn.

page_text: 5. A pump or propeller for moving water or other liquids, air, or gases, consisting
essentially of a fixed disc and a revoluble casing, having vanes attached to it,
-substantially as described and shewn, with reference to Fig. 10.
Dated this 30th day of April 1896.
GEO. MITCHELL.