Improvements in Centrifugal Pumps.
Year: 1893

page_text: Date of Application, 25th Mar., 1893-Accepted, 20th May, 1893,
COMPLETE SPECIFICATION.
Improvements in Centrifugal Pumps.
We, ARTHUR DEVONSHIRE ELLIS, Managing Director, of Messrs. Thwaites
Brothers, Limited of Bradford, in the County of York, and WILLIAM BATEMAN
CRICHTON, of the same place 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 certain improvements in centrifugal pumps, and has for
its object, the construction of the various parts forming the casing surrounding the
impellor or vane, in such a manner that, the pump may be converted into a right
or left hand, by the interchanging of the mechanical parts.
In order that our invention may be fully understood, we will describe the same
in detail by making reference to the accompanying sheets of drawings in which
Fig. 1 represents a sectional elevation of a double suction pump arranged
according to our invention.
Fig. 2 a plan thereof.
Fig. 3 a sectional elevation of a single suction pump arranged according to our
invention, and
Fig. 4 a plan of same.
The impellor indicated by the letter A is secured upon the shaft B, by a key B¹
in the ordinary manner; a second keyway being provided in the impellor A to
enable it to be secured to the shaft B in the reversed position when required. The
side casing C is a fixture and forms part of the bed plate D and is provided with a
faced flange D', and coupled to the middle portion E of the casing terminating in
the discharge pipe F. The opposite side casing G is of a similar design to C and
faced in the same manner at G, and coupled to the middle portion E, by bolts in a
like manner to the casing (.
By taking off the casing G the middle portion E may also be removed and then
replaced in the reversed position, bringing the discharge pipe F to the position
shewn by dotted lines in Fig. 2; by reversing the impellor A on the shaft B and
replacing the casing G, the pump is converted from a right to a left hand one or
vice versa.
In single suction pumps (see Figs. 3 and 4) the side casing C also forms part of
the bed plate D and is coupled to the middle portion E in the manner as
hereinbefore described. The opposite side casing G is of a similar contour and
faced in a like manner thus admitting of the discharge pipe F being reversed in a
similar manner to the double suction pump hereinbefore described.
By constructing double and single suction pumps in the manner described, the
middle portion E, terminating in the discharge pipe F. is capable of being swivelled
or adjusted radially between the two side casings C and G whereby the discharge
pipe F may be altered to any desired angle to meet the requirements of the various
points of discharge, the suction or supply portion of the pump N remaining
stationary as shewn by the various figures.
Figs. 5 and 6 (Sheet 2) are modified arrangements of our improvements and
illustrate different methods of construction. The impellor A is mounted on the
shaft B as hitherto, and surrounded by the casings C. E and Gas before described.
In each case the casing C forms part of the bed plate D. and is connected to the
middle casing E. by faced joints D'. the middle casing E in each case being capable
of radial adjustment between the side casings C and G ; and may be converted into
a right or left hand pump as is desired. In Fig. 5 the connection between the side
casing G and the casing C is made by a horizontal joint at X and in Fig. 6 by a
vertical ioint at the point. Z.

page_text: Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
The combination of the parts forming the complete pump arranged substantially
in the manner as hereinbefore described, the essential novelty of our invention
consisting in the conversion of the pump from a right to a left hand or vice versa ;
and the means employed for the radial adjustment of the discharge portion of the
pump without interfering with the suction or supply pipe.
Dated this 24th day of March 1893.
JOHN WAUGH,
Agent.