Improvements in and relating to Centrifugal Pumps.
Year: 1893

page_text: Date of Application, 26th Sept., 1893-Accepted, 23rd Dec., 1893
COMPLETE SPECIFICATION.
Improvements in and relating to Centrifugal Pumps.
I, ELI JABEZ HAWLEY, a citizen of the United States of America, residing
at Manchester, in the County of Bennington and State of Vermont, one of the
United States of America, Manufacturer, 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 Specification
My invention relates to improvements in centrifugal pumps of the kind in which
the pump
is provided with a removable lining in the piston casing and a removable
bearing in the journal, such pumps being now extensively used in elevating water
mixed with sand, chilled shot, or other abrasive substance to the gang-frames of
stone-sawing machinery and rubbing-beds.
Heretofore in pumps designed for the above-stated use the casing was provided
with two flat side-lining plates, between which was placed an annular lining, all
being held in place by the cap-plate.
Also, in said pumps the journal bearing was tubular in form, and could be
removed only by first removing the piston from the casing. Furthermore, in those
pumps the water for washing and lubricating the journal-bearing was admitted
directly into a longitudinal channel, flowing thence inwardly until it reached an
annular recess near the inner end of the bearing, whence it was forced out onto the
piston.
One object of my invention is to improve the construction of the inlet and of the
side lining on the inlet side of the pump.
Another object of my invention is to improve the construction of the bearing in
the journal so as to render it capable of removal and replacement without neces-
sitating the removal of the linings and the piston, and to provide for a better
lubrication of the shaft.
The invention will first be described in connection with the accompanying
drawings, and then pointed out in the claims.
.
Figure 1 of the drawings is a sectional elevation of my improved pump.
Figure 2 is a sectional view of one section of the shaft-bearing.
Referring to the drawings, A, A', represent the casing, the letter A' indicating
the cap-plate; B, the water inlet; C, the piston; D, the piston-shaft; E, the
annular concave lining; F, G, the side lining plates; H, the journal bolted to the
cap-plate; I, the bearing in the journal; J, the gasket, removably secured in
the outer end of the journal, and K, the pipe through which water is admitted to
the interior of the journal for lubricating the shaft.
I have found by experience that in the use of a pump for elevating water mixed
with sand or other gritty substance there is excessive wear at the inner portion of
the inlet, owing to the violent whirl there imparted to the in-going mixture,
resulting in an early cutting away of that part of the inlet-pipe, after which the
shot or sand is free to act with destructive effect upon the edges of the casing.
To shield the casing from wear in the manner stated is one purpose of my present
invention, and this I accomplish by forming the inlet side of the casing with an
extension L, adapting its outer end for the reception of a suction-pipe (not shown).
In the inner end of this extension 1 form an annular recess r of a depth suitable for
the reception of the lining hereinafter mentioned, and of a length sufficient to
carry the lining outward beyond the point at which the whirling action of the fluid
is set un.

page_text: Instead of making the lining-plate G flat, as has heretofore been done, I form it
with a tubular extension T, preferably integral with the plate, adapted to fit neatly
and flush in the recess in extension L of the casing, the inner end of this tubular
. portion entering the piston. Thus it will be seen that all wear at the inner end of
the inlet will fall on the lining-plate, and this plate, when worn beyond the point of
usefulness, can be replaced by a new one at a nominal cost.
To render the bearing in the journal capable of removal and replacement without
necessitating the removal of the linings and piston, and to provide for a better
lubrication of the shaft, is another purpose of iny invention, which I accomplish by
constructing the bearing in sections, preferably halves, reducing the diameter of the
inner end, so as to leave a shoulder S adapted to bear on the outer side of the
casing, and thus prevent inward movement of the bearing, this reduced portion
extending through the casing and through the side lining plate, as shown. To
prevent outward movement of the same, I forn a shoulder / in the journal, against
which the outer end of the bearing abuts. Outward beyond this shoulder h the
diameter of the bore of the journal is reduced to that of the bore of the bearing;
and in this reduced bore of the journal I form an annular groove 1, with which the
water-supply pipe K is connected. Inward from this groove there is a longitudinal
channel 2, which opens into an annular groove 3 in the outer end of the bearing,
this latter groove being connected by a longitudinal channel 4 with a similar
groove 5 in the bearing, near its inner end. By means of these. series of grooves
and channels I obtain better lubricating and cleansing effects from the water than
heretofore, owing to the increased water-surface presented to the shaft.
It will be observed on reference to the drawings that the bore of the bearing
inward from groove 5 is somewhat enlarged, in order to permit the water used in
lubrication of the shaft to pass inward to the face of the piston. It will be apparent
that the packing P held in place around the shaft by the gasket J will prevent the
water from passing outward.
•
With the bearing constructed as above described, all that is necessary to do in
order to remove it from or place it in the pump is to unbolt the journal, slide it
outward on the shaft, and lift out or put in the bearing by sections.
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 having a hollow piston, the combination, with a casing
having a removable cap-plate and a recessed inlet-extension, of an annular lining
surrounding the periphery of the piston, and two lining plates, one on each side of
the annular lining, one of said plates having an integral tubular extension, said
tubular extension projecting from each side of the plate, its inner end reaching
within the piston and its outer end adapted to fit within the recess in the inlet-
extension, the several parts of the lining being held rigidly in place by the cap-
plate.
2. In a centrifugal pump, the combination, with the casing provided with a
removable lining, and a journal removably secured to the casing and having au
interior shoulder, of a sectional bearing having an exterior shoulder adapted to
bear on the outer side of the casing, the inner end of said bearing passing through
the casing and through the side lining plate, while the outer end abuts against the
shoulder in the journal.
3. In a centrifugal pump, the combination, with the casing, provided with a
removable lining, a journal removably secured to the casing and baving an interior
shoulder, an interior annular groove, and a longitudinal channel connecting with
said groove and extending to the shoulder, and a water-supply pipe tapped into the
journal to connect with the annular groove therein, of a sectional bearing having an
exterior shoulder adapted to bear on the outer side of the casing, an interior
annular groove in its outer end, a similar annular groove near its inner end, and a

page_text: longitudinal channel connecting said grooves, the inner end of said bearing passing-
through the casing and through the side-lining plate, while the outer end abuts-
against the shoulder in the journal.
Dated this 26th day of September 1893.
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.