Improvements in Centrifugal Pumps.
Year: 1892

page_text: Date of Application, 26th Apr., 1892
Complete Specification Left, 25th Jan., 1893-Accepted, 8th Apr., 1893
PROVISIONAL SPECIFICATION.
Improvements in Centrifugal Pumps.
1, JOHN EMMETT LAWRENCE, of 31, Trundley Road, Deptford, in the County
of London, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to improvements in centrifugal pumps whereby access to
the interior thereof can be obtained in a more simple and ready manner than
hitherto.
For this purpose I form the casing of the pump on which is cast the volute in
two parts, the joint being in a straight line through the axis of the pump spindle ;
one of the parts is fixed and has the discharge outlet cast on it, the other part is
movable and can be turned on a joint to enable the interior of the pump to be
cleaned and the disc and spindle to be removed and replaced without disturbing the
fixed part of the pump or in any way interfering with the suction or delivery
pipes.
The two parts of the pump casing are formed with flanges up to the discharge
outlet through which the parts are bolted to each other. By constructing pumps
in this manner they can be produced with much less labour than before.
Dated the 26th day of April 1892.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Centrifugal Pumps.
1, JOHN EMMETT LAWRENCE, of 31, Trundleys Road, Deptford, in the County
of London, 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 improvements in centrifugal pumps whereby access to
the interiors thereof can be obtained in a more simple and ready manner than
hitherto.
For this purpose I forin the casing of the pump, on which is cast the volute, in
two parts, the joint being in a straight line through the axis of the pump spindle;
one of the parts is fixed and has the discharge outlet cast on it, the other part is
movable and can be turned on a hinge joint to enable the interior of the pump to
be cleaned and the disc and spindle to be removed and replaced without disturbing
the fixed part of the pump, or in any way interfering with the suction or delivery
pipes.
The two parts of the pump casing are formed with flanges up to the discharge
outlet through which the parts are bolted to each other. By constructing pumps
in this manner they can be produced with much less labour than before.
To enable my invention to be fully understood I will describe the same by
reference to the accompanying drawing in which :-
Figure 1 is a longitudinal vertical section of a centrifugal pump the suction or
inlet openings of which are at the two sides of the revolving disc or fan and the
discharge opening or outlet of which is at the periphery; and,
Figure 2 is a plan of such pump :
Figure 3 is an elevation of a pump illustrating an arrangement for moving the
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page_text: top part of the casing such arrangement being especially applicable for use in
conjunction with heavy pumps.
Similar letters of reference indicate corresponding parts in the several figures.
a, indicate the lower and upper parts respectively of the pump casing or body,
the former of which has the inlet or suction passages c, c and the discharge passage d
cast integral therewith, the division line between the two parts passing through the
centre of the bearings e, e of the spindle, but extending only up to the discharge
pipe so that the said upper part 6 of the casing can be removed without disturbing
any of the connections of the suction or discharge pipes, or the revolving disc
or fan.
In practice I find it advantageous to hinge the two parts a, b of the casing as at f
whereby, in order to obtain access to the interior of the pump, it is only necessary
to throw back the part b.
In cases where my invention is applied to heavy pumps, I advantageously provide
in conjunction with the upper part 6 of the casing means for lifting or moving the
same. An arrangement suitable for this purpose is shewn in Figure 3 in which
g indicates a double armed lever pivotted at h and having in connection with one arm
a nut i with which a screwj engages, the said screw being supported by a bracket k
at its upper end and at its lower end upon a foot-piece in such a manner that no
longitudinal movement can be imparted to the said screw; the other arm of the
said lever g is bifurcated, so as to embrace the casing, and connected to the said
casing on each side by a pivot m. With this arrangement it will be readily under-
stood that the movement of the screw j in one or the other direction will cause the
lifting of the cover, as shewn in Figure 3, or the lowering of the same.
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 centrifugal pump casing divided on a straight line extending through the axis
of the revolving disc or fan and up to the discharge pipe in such a manner that
the upper part of the said casing can be moved without disturbing the connections
of the suction and discharge pipes, substantially as described.
2. In a centrifugal pump the casing of which is divided on a straight line
extending through the axis of the revolving disc or fan, means for lifting the upper
part of the said casing, substantially as described and illustrated in Figure 3 of
the accompanying drawing.
Dated this 25th day of January 1895.
8 25th day of January 1895.
G. F. REDFERN & CO.,
4, South Street, Finsbury, London, Agents for the Applicant.