Improvements in or in connection with Centrifugal Pumps.
Year: 1895

page_text: PROVISIONAL SPECIFICATION.
Improvements in or in connection with Centrifugal Pumps.
I. PIETER HÖVIG, of Langeweg B 197, Zwyndrecht, in the Kingdom of the
Netherlands, Consulting Engineer, do hereby declare the nature of this invention
to be as follows:-
This invention has reference to improvements in or in connection with centrifugal
pumps, and it has for its object to increase the efficiency of the pump and lessen
the friction and wear of the pump spindle. My invention is specially applicable
to centrifugal pumps used in dredging apparatus of the kind in which material
such as mud, sand, silt and the like is raised by means of water through a suction
pipe connected with the pump.
And in order that my invention may be clearly understood, I will proceel to
explain the same by aid of the accompanying drawings, in which :-
Figs. 1, 2, and 3 show in longitudinal sectional elevation, plan, and cross section
respectively, a vessel fitted with a suction dredger the centrifugal pump of which
is constructed according to this invention.
Fig. 4 is a plan, drawn to a larger scale, showing the centrifugal pump and its
water receptacle.
Fig. 5 is a longitudinal section and Fig. 6 is an end view, showing, to a still
larger scale, the spindle bearing of such pump.
Fig. 7 is an end view showing the segments of the bush or gland, used in such
bearing, moved apart.
1 is a centrifugal pump provided with a suction tube 2 and a delivery tube 3,
the spindle + of the pump being driven by an engine 5 and the whole forming a
suction dredger carried by the vessel 6, as well understood.
In order to prevent leakage of air into the interior of the pump casing through
the bearing 7 (or hearings), in which the pump wheel spindle 4 rotates, and
thereby to obviate the consequent decrease in the efficiency of the pump, the
pump, according to this invention, is placed wholly or partially within a receptacle 8,
which is charged with a liquid such as water (hereinafter referred to as water) to
a height above the bearing and is open at the top to the atmosphere, so that
when the pump, which shown, by way of example, as having only one spindle
bearing 7, is working and a partial vacuum is set up within the pump casing, a
comparatively small quantity of water will flow through the said bearing into the
pump casing and thus prevent the vacuum therein from being impaired by the
entrance of air. The water also acts to reduce the friction of the pump spindle,
and to keep the bearing free from grit and like matter liable to enter the bearing
and cause rapid wear thereof.
To enable water to pass through the bearing 7, the said bearing, instead of
being formed as an ordinary stuffing box, as heretofore, comprises a conical bush
or gland 9 arranged to be forced into a corresponding conical hole g³ in a boss 1"
on the side of the pump-casing, as shown in Fig. 5, and made in longitudinal
segments as shown in Figs. 6 and 7 so that it can be placed around the pump-
spindle 4, and adjusted from time to time, to compensate for wear, by setting up
nuts 10 on studs 11, which extend through slots in the gland segments as shewn.
A lining 12 of suitable material, such as anti-friction metal, is preferably interposed
between the gland-segments 8 and the spindle 4, or a sleeve 4ª fixed thereon.

page_text: Upon the pump-spindle 4, at the inner side of the bearing, is or may advantageously
be placed a ring 13 of suitable elastic material, such as india-rubber, that bears
against the inner end of the bearing, and tends to prevent mud, sand, or the like
within the pump casing from entering the bearing when the pump is at rest.
Bearings constructed as described can be placed nearer to the pump wheel or
flyer than usual,
7 is a stuffing box by which the pump-spindle 4 works water-
tight in the wall of the water-receptacle 8.
יני.
Improvements in or in connection with Centrifugal Pumps.
1, PIETER HÖVIG, of Langeweg B 197, Zwyndrecht, in the Kingdom of the
Netherlands, 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 has reference to improvements in or in connection with centrifugal
pumps, and it has for its object to increase the efficiency of the pump and lessen
the friction and wear of the pump spindle. My invention is specially applicable
to centrifugal pumps used in dredging apparatus of the kind in which material
such as inud, sand, silt and the like is raised by means of water through a suction
pipe connected with the pump.
And in order that my invention may be clearly understood, I will proceed to
explain the same by aid of the drawings filed with my Provisional Specification,
in which :-
==
Figs. 1, 2, and 3 show in longitudinal sectional elevation, plan, and cross section
respectively, a vessel fitted with a suction dredger the centrifugal pump of which
is constructed according to this invention.
Fig. 4 is a plan, drawn to a larger scale, showing the centrifugal pump and its
water receptacle.
Fig. 5 is a longitudinal section and Fig. 6 is an end view, showing, to a still
larger scale, the spindle bearing of such pump.
Fig. 7 is an end view showing the seginents of the bush or gland, used in such
bearing, moved apart.
1 is a centrifugal pump provided with a suction tube and a delivery tube 3,
the spindle of the pump being driven by an engine
and the whole forming a
suction dredger carried by the vessel 6, as well understood.
In order to prevent leakage of air into the interior of the pump casing through
the bearing 7 (or bearings), in which the pump, wheel spindle 4 rotates, and
thereby to obviate the consequent decrease in the efficiency of the pamp, the pump
according to this invention, is placed wholly or partially within a receptacle S,
which is charged with a liquid such as water (hereinafter referred to as water) to
a height above the bearing 7 and is open at the top to the atmosphere, so that
when the pump, which is shown, by way of example, as having only one spindle
bearing 7, is working and a partial vacuum is set up within the pump casing, a
comparatively small quantity of water will flow through the said bearing into the
pump casing and thus prevent the vacuum therein from being impaired by the
entrance of air. The water also acts to reduce the friction of the pump spindle,
and to keep the bearing free from grit aud like matter liable to enter the bearing
and cause rapid wear thereof.

page_text: To enable water to pass through the bearing 7, the said bearing, instead of
being formed as an ordinary stuffing box, as heretofore, comprises a conical bush
or gland 9 arranged to be forced into a corresponding conical hole 9* in a boss 1*
on the side of the pump-casing, as shown in Fig. 5, and made in longitudinal
segments as shown in Figs. 6 and 7 so that it can be placed around the pump-
spindle 4, and adjusted from time to time, to compensate for wear, by setting up
nuts 10 on studs 11, which extend through slots in the gland segments as shown.
A lining 12 of suitable material, such as anti-friction metal, is preferably interposed
between the gland-segments 9 and the spindle 4, or a sleeve 4ª fixed thereon.
Upon the pump-spindle 4, at the inner side of the bearing, is or may advantageously
be placed a ring 13 of suitable elastic material, such as india-rubber, that bears
against the inner end of the bearing, and tends to prevent mud, sand, or the like
within the pump casing from entering the bearing when the pump is at rest.
Bearings constructed as described can be placed nearer to the pump wheel or flyer
than usual. 7 is a stuffing box by which the pump-spindle 4 works water-tight in
the wall of the water-receptacle 8.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. The combination with a centrifugal pump of an external water receptacle
open to the atmosphere and in which the pump is wholly or partially placed so
that its bearing or bearings can, when the pump is in action, be immersed in
water and air be thereby prevented from passing from the external atmosphere
through the said bearing or hearings into the pump casing and impairing the
efficiency of the pump, substantially as herein described.
2. A centrifugal pump having its spindle bearing or hearings formed or each
formed by an adjustable conical gland or bush made in segments taking into a
corresponding hole in the side of the pump casing and between which an inter-
mediate space for allowing water to pass to the interior of the pump, in combination
with an external receptacle to hold water in which the bearing or each bearing
will be immersed when the pump is in action so as to prevent entrance of air to
the pump casing, and reduce friction and wear between the pump spindle and
bearing or bearings, substantially as herein before described with reference to and
shown in the drawings annexed, whether or not one or more rings 13 be provided
to prevent the entrance of dirt to the bearing or bearings when the pump is
at rest.
Dated this 5th day of Jul. 1905