Improvements in or relating to Centrifugal Pumps.
Year: 1889

page_text: Date of Application, 24th Sept., 1889.
Complete Specification Left, 24th June, 1890-Accepted, 26th July, 1890
PROVISIONAL SPECIFICATION.
Improvements in or relating to Centrifugal Pumps.
1, KARL LEVERKUS, of 3 Herbert Street, Moss Lane East, Manchester in the
County of Lancaster, Engineer, do hereby declare the nature of this invention to
be as follows:
i
This invention relates to centrifugal pumps and it consists chiefly in the application
of a ladle wheel having either on the one side or on both sides ladles in the shape of a
spiral running from the centre to the periphery and arranged so that no water may
return from the wheel or delivery pipe to the suction part.
To ensure this L. cover the side of the wheel where the spiral ladles are placed with
a disc having on the other side radial vanes (such as in centrifugal pumps having open
wheels with radial vanes or ladles) and I provide in case the wheel has the ladles on
one side only the back of same also with radial vanes of like length as the vanes on
the cover.
I then enclose the wheel thus arranged in a casing. The casing may either
be simple as in ordinary,, centrifugal pumps or be provided with a diffuser for the
purpose of strengthening the same at the inner circumference and gradually
decreasing the speed of the water on leaving the wheel to that in the delivery
pipe.
"
The diffuser is a canal or chamber surrounding the casing proper in one or
several, turns and, ending in the delivery, pipe the area of such chamber, or canal
gradually increasing.
The covering of the side of the wheel where the spiral ladles are placed may be
done in the following manner :-
וי
Recesses corresponding to the spiral ladles are turned in the one side of the cover
to a depth about double; the thickness of the cover so that either the cover is cut
entirely through and keeps itself together only by means of the radial vanes if the
cover is a smooth or plane surface on the back or the recesses are cut into thick ribs
that are arranged on the other side of the cover in shape corresponding to the spiral
ladles and the spiral ladles are, so cut that a rim on either side of the ladle is left so
that on putting the top of the spiral ladles into the recessed cover the shoulders of the
recesses come close to the rim whereby the inside width of the ladle wheel is rendered
uniform in the circumference. To secure the cover to the wheel radial keys or
feathers are put in suitable channels through the tops of the spiral ladles.
The recesses in the cover commence at a suitable distance from the inner circum-
ference and end at a certain distance from the outer periphery so as not to cut up the
cover at the outer and inner peripheries. The ends of the spiral ladles are sloped
and the tops down to the rims are removed so far as the recesses in the cover do
not extend.
f
The complete ladle wheel with covers arranged in the above manner will then have
on both sides radial vanes which will when the wheel is put in the casing and the
pump is started produce in the water running at the sides with the radial vanes such
a pressure as is sufficient to keep the water in the delivery pipe off the sides of the
ladle wheel and thus enable the latter to continually lift the water.
To equalize the axial pressures in case the ladle wheel has the ladles on one side only
I connect tlie central space at the back corresponding to the inlet of the pump with
the suction pipe by means of a suitable pipe.
Dated this 23rd day of September 1889.

page_text: L
COMPLETE SPECIFICATION.
Improvements in or relating to Centrifugal Pumps.
I, KARL LEVERKUS, of 3 Herbert Street, Moss Lane East, Maneliester, in the
County of Lancaster, 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 centrifugal pumps and it consists chiefly in the application
of a lille wheel having either on the one-side or on both sides ladies in the shape of
a spiral running from the centre to the periphery and arranged so that no water may
return from the wheel or delivery pipe to the suction part..
ri
And in order that my invention may be fully understood and readily carried into
effect I will describe the accompanying Sheet of Drawings reference being had to the 1
figures and letters marked thereon.
Figures 1 to 4 show a pump with a single suction inlet Y"where the ladle wheel A
has also only on the one side ladles B B.
Figs. 5 to 7 show a pump with donble suction inlets Y where the ladle wheel A has
on both sides spiral ladles B-B.
Figs..S to 11 are views of details of the pump.
:
For a pump with single suction inlet such as in Fig. 1, 1 cover the side of the
wheel A where the spiral ladles B B are placed with a disc C (Figs. 1 and 3) having
on the other side radial vanes D, and further provide the wheel A on its back also
with radial vanes G (Figs. 1 and 4) of like length as the vanes D on the cover C. To
Secure these vanes the cover C and the back of the wheel A each have an outer
flange or border E and H respectively and an inner flange or border F and I
respectively.
For a pump with double suction inlets Y Y such as Fig. 5; I cover the two sides of
the wheel A with discs Chaving on the other side the radial vanes D, the outer flange
or border E and the inner flange or border F.
I then enclose the wheel A thus, arranged in a casing. The casing may either be
simple as K in Fig. 2 as in ordinary centrifugal pumps, or be provided with a diffuser
as in Fig. 6 for the purpose of strengthening the same at the inner circumference and
gradually decreasing the speed of the water on leaving the wheel for the delivery pipe.
The diffuser is a canal or chamber K K K K K surrounding the casing proper K
in one or several turns and ending in the delivery 'pipe I, the area of such chamber
or canal gradually increasing towards the delivery as shown in Fig. 6.
The side of the wheel A where the spiral ladles are placed may be covered in the
following manner :—
Recesses O, Figs. Sand 10 corresponding to the spiral lalles B B are turned in the
!! one side of the cover C to a depth about double the thickness of the cover so that
either the cover is cut entirely through as shown in Figs. 5, 7 and 8 and keeps itself
together only by means of the radial vanes D if the cover is a smooth or plane surface
on the back such as Figs. 5 and 7 or the recesses are cut into thick ribs, see
Figs. 1, 3 and 10, that are arranged on the other side of the cover C in shape corre-
sponding to the spiral ladles B B and the spiral ladles are so cut that a rim P (Figs. S
and 10) on either side of the ladle is left so that on putting the top of the spiral
adles B B into the recessed cover the shoulders of the recesses come close to the
rims whereby the inside width of the ladle wheel A is rendered uniform in the
circumference. To secure the cover C to the wheel A radial keys or feathers Q,
Figs. 3, 7, 9 and 11, are put in suitable channels R through the tops of the spiral
ladies.
The recesses in the cover C commence at a suitable distance, from the inner circum-
ference at S, see Figs. 3 and 7, and end at a certain distance from the outer periphery
at T so as not to cut up the cover at the outer and inner peripheries. At the points S
and T holes of sufficient size are made in the cover C so as to allow of the tool cutting
the recesses easily and are afterwards filled up by suitable pieces and screws as shown.

page_text: The ends of the spiral ladles are sloped and sharpened by so manipulating the tool as
to cut conical surfaces as shown by the line UV in Figs. 1 and 5 for the inner
circumference and as shown by the line W X for the outer periphery, and the tops
of the spiral ladles down to the rims P are removed as far as the corresponding
recesses are not cut in the cover C.
The complete ladle wheel A arranged in the above manner will then have on
both sides radial vanes D and G which will, when the wheel is put in the casing
and the pump is started, produce in the water running at the sides with the radial
vanes such a pressure as is sufficient to keep the water in the casing and in the
delivery pipe M off the sides of the ladle wheel and thus enable the latter to
continually lift the water.
To equalize the axial pressures in a pump with single suction inlet I connect
the central space Z at the back Fig. 1, corresponding to the inlet Y of the pump
with the suction pipe by means of a suitable pipe Z¹.
Figs. 1 and 5 show examples of casings for the ladle wheel arranged as above
described. This ladle wheel may, however, be put in any other casing of suitable
shape and construction.
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. In a centrifugal pump the combination consisting of a ladle wheel having
ladles in the shape of a spiral running from the centre to the periphery with radial
vanes at both sides and outer and inner flanges or borders for the purpose of pro- .
ducing such a pressure in the water running at the sides with the vanes D and G
as is sufficient to prevent the water in the casing and delivery pipe from returning
to the suction part substantially as set forth.
2. In a
centrifugal pump with single suction inlet the combination with, the
ladle wheel A having the cover with radial vanes D on the one side of the spiral
ladles and the radial vanes G on the other side, of a suitable pipe Z¹ for connecting
the central space Z with the suction pipe substantially as set forth.
3. In a centrifugal pump the construction and arrangement of the spiral ladles
with rims P for receiving the cover C and with grooves for securing the same by
means of keys or feathers Q substantially as shown and described.
4. In a centrifugal pump the construction of the cover or covers C with recesses O
either through the cover or in thick ribs for the spiral ladles, and key or feather
channels R for fixing the cover to the ladle wheel A substantially as shown and
described.
Dated this 23rd day of June 1890.
H. B. BARLOW,
17, St. Ann's Square, Manchester, Agent for Applicant.