An Improvement in Centrifugal Pumps.
Year: 1893

page_text: Date of Application, 11th Mar., 1893-Accepted, 2nd June, 1893
COMPLETE SPECIFICATION.
An Improvement in Centrifugal Pumps.
CHARLES LOUIS HETT Turbine Foundry Brigg Lincolnshire 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:—
My invention, which is an improvement on my patent pump described in my
Specification No. 8119 dated the 4th June 1888, has for its object, the permitting
access to, and the removal of the disc, without disturbing the suction pipes, while
retaining the advantages of my former arrangement: also for overcoming the
difficulty which arises from the entrance of air through the stuffing boxes, when
the latter are not kept very tight.
In carrying out my invention I fit a loose cover on the side of the pump next
I divide the
to the pulley, through which the disc is introduced and withdrawn.
pressure flange which holds the bend in its place into two or more segments. The
spindle may be carried through the bend as shown in Fig. 2: but by preference I
do not carry it through. If it is carried through it must have the usual stuffing
box, and it should be fitted with my arrangement for preventing the entrance of
air about to be described.
The leakage of air through the stuffing boxes of centrifugal pumps is a fruitful
source of trouble: to prevent this I arrange my stuffing boxes with a chamber
behind each, into which water is conducted from the delivery portion of the pump.
Hence (unless the pump is fitted with a syphon delivery pipe and its centre is above
the level of the discharge) slack packing will only permit the escape of a little
water and will not allow any air to enter.
I now proceed to describe the accompanying drawing.
Figure 1 represents a longitudinal sectional view of the pump with the suction
bend held it its swivelling position by the loose ring H.
Like letters refer to like parts.
A the pump spindle B the suction bend C driving pulley D the bearings E the
standard F the bed G swivelling flange of the suction bend or pump cover, H loose
ring I delivery branch J pump case K the disc or runner L nuts and screws
M loose cover N pressure chamber.
Having now described the nature and object of my invention, and the manner
in which the same is to be performed, I claim as novel the following
Firstly. The combination in a centrifugal pump, of a loose cover on the one
side and a swivelling bend on the other, the latter being arranged with the pressure
of the delivery on the joint: so that in event of a leaky joint no air will enter the
I disclaim any
suction pipe: although a little water will escape from the pump.
novelty in the swivelling suction unless it is made with the joint under the pressure
of the delivery.
Secondly. The use of a chamber behind the stuffing box in connection with the
delivery water so as to prevent the entry of any air into the pump as described.
This part of my invention is applicable to pumps of ordinary construction, when
discharging above the level of the stuffing box.
Dated this 10th day of March 1893.
CHAS. LOUIS HETT.