Improvements in Centrifugal Pumps for use in Ejecting or Removing Furnace Ashes or other Substances, mainly applicable for use on Board Ship.
Year: 1897

page_text: Date of Application, 8th Feb., 1897-Accepted, 5th Feb., 1898
Improvements in Centrifugal Pumps for use in Ejecting or Removing
Furnace Ashes or other Substances, mainly applicable for use
on Board Ship.
I, JAMES PATTERSON, of Mather House, Gourock, in the County of Renfrew, North
Britain, 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 :-
The present invention relates to improvements in centrifugal pumps which are
employed for ejecting or removing furnace ashes or other substances, the inlet orifice
of the pump casing being connected to a suitable hopper to which the material to be
ejected or removed is supplied, and which in its turn is connected with a suitable water
supply, so that by the action of the pump the ashes or other substances and also water
are drawn into the pump casing, and becoming intimately mixed therein are ejected
through the discharge orifice of such pump.
have found that when a centrifugal pump is employed for the purpose indicated
the blades of same are subjected to great abrasion and wear from the action of the
ashes or other substances thereon, and my present invention is intended to overcome
this difficulty, for which purpose I employ knives or cutters, of hardened steel or
other suitable material, which I connect to the blades of the pump, so that same
project at an angle therefrom (preferably at a right angle), and by acting upon and
breaking up the ashes or other substances as they enter the pump casing, and before
they come in contact with the blades of the pump, the abrasion or wear upon the
blades is reduced to a minimum.
A suitable method of carrying my invention into effect is shown in the accompany-
ing drawing in which,
Fig. 1 is a vertical section of the pump spindle and blades with the knives or
cutters applied thereto.
Fig. 2 is an end elevation of same, and
Fig. 3 a transverse section through one of the blades and knives.
A is the pump spindle, B the blades secured thereto in any suitable manner, and C the
knives or cutters which are attached to such blades in any suitable manner such as
by the bolts c, c.
D is one side of the pump casing, and the inlet orifice thereto which is
connected to a hopper or other suitable receptacle, to which the ashes or other
substances to be ejected or removed are supplied, such hopper as above stated being
also connected to a suitable water supply.
It will be seen that the cutting surfaces of the cutters C are arranged so as to lie
close to the inner surface of the pump casing D in which the inlet orifice d is formed,
and when the pump is caused to revolve the ashes will, by the action of the blades B,
be drawn into the pump casing through the orifice d through the spaces between the
knives or cutters C, the cutting surfaces of which latter will act upon and break up
such ashes as they enter the pump casing, and before they come in contact. with the
blades B.

page_text: Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed I declare that
what I claim is :-
The combination with the blades of a centrifugal pump for use in removing or
ejecting ashes or other substances, of knives or cutters secured to such blades and
working over the inlet orifice of the pump so as to cut or break up the substances to
be removed or ejected before same can come into contact with the blades of the
pump, and thereby greatly reduce the wear or abrasion of the latter, substantially as
specified.