Improvements in Centrifugal Pumps and Fans.
Year: 1889

page_text: Date of Application, 31st Jan., 1859
Complete Specification Left, 25th Oct., 1889-Accepted, 14th Dec., 1889
PROVISIONAL SPECIFICATION.
Improvements in Centrifugal Pumps and Fans.
I, HAROLD AINSWORTH ENTWISLE of the firm of Thomas Entwisle and Son, Atlas
Foundry, Bolton in the County of Lancaster, Engineers and Machinists, do hereby
declare the nature of my said invention to be as follows:-
This invention relates to improvements in centrifugal pumps and fans, and is
designed to minimise the retarding action of the liquid or air when being delivered
to the revolving dise and vanes and the weight or head of liquid or pressure of air from
the outlet.
The revolving disc or wheel of the pump or fan with its circular or segmental
blades or vanes is enclosed between two cheeks bolted together and provided with
inlet and outlet passages. The inlet passage is divided into two thoroughfares, one on
each side to allow of the liquid or air being supplied to the centre of the revolving
disc or wheel. The thoroughfares are each constructed in a spiral form to direct the
liquid or air in a circular manner corresponding with the direction of the travel or
circular motion of the revolving disc or wheel, thereby minimising or reducing the
retarding action of the liquid or air to the least possible degree, which must of
necessity increase the lifting power of a pump and the blowing power of a fan, and
also reduce the power to drive the same. The revolving disc or wheel with the
circular or segmental blades or vanes is mounted on a spindle or shaft held in suitable
bearings and stuffing boxes on the sides of the pump or fan or otherwise. The spindle
or shaft is provided with a pulley or wheel driven by suitable mechanism in any
convenient manner. The pump or fan with its driving arrangements can be mounted
on a bed plate to make the whole self-contained.
To reduce back-pressure on the circular or segmental blades or vanes of the
revolving disc or wheel to a minimum the latter are provided near their outer
extremities with curved projections, the edges of which are turned to the internal
diameter of the cheeks or casing of the pump or fan. As soon as each projection
passes the point dividing the outlet from the central portion of the pump or fan the
bulk of the circular or segmental vane or passage is released from the pressure of
liquid or air in the outlet pipe.
D
1th 20th Jan 1980
EDMUND CHADWICK,
A gent.
COMPLETE SPECIFICATION.
Improvements in Centrifugal Pumps and Fans.
I, HAROLD AINSWORTH ENTWISLE of the firm of Thomas Entwisle and Son, Atlas
Foundry, Bolton in the County of Lancaster, Engineers and Machinists, do hereby
declare the nature of my said 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 improvements in centrifugal pumps and fans, and is
designed to minimise the retarding action of the liquid or air when being delivered to
the revolving disc and vanes and the weight or head of liquid or pressure of air
from the outlet.
The revolving disc or wheel of the pump or fan with its circular or segmental
blades or vanes is enclosed between two cheeks bolted together and provided with
inlet and outlet passages. The inlet passage is divided into two thoroughfares, one on

page_text: each side to allow of the liquid or air being supplied to the centre of the revolving
disc or wheel. The thoroughfares are each constructed in a spiral form to direct the
liquid or air in a circular manner corresponding with the direction of the travel or
circular motion of the revolving disc or wheel, thereby minimising or reducing the
retarding action of the liquid or air to the least possible degree, which must of
necessity increase the lifting power of a pump and the blowing power of a fan, and
also reduce the power to drive the same. The revolving disc or wheel with the circular
or segmental blades or vanes is mounted on a spindle or shaft held in suitable bearings
and stuffing boxes on the sides of the pump or fan or otherwise. The spindle or shaft
is provided with a pulley or wheel driven by suitable mechanism in any convenient
manner. The pump or fan with its driving arrangements can be mounted on a
bed-plate to make the whole self-contained.
To reduce back-pressure on the circular or segmental blades or vanes of the
revolving disc or wheel to a minimum the latter are provided near their outer
extremities with curved projections, the edges of which are turned to the internal
diameter of the cheeks or casing of the pump or fan. As soon as each projection
passes the point dividing the outlet from the central portion of the pump or fan the
bulk of the circular or segmental vane or passage is released from the pressure of
liquid or air in the outlet pipe.
Fig. 1 is an elevation of my improved centrifugal pump or fan through line A¹ B¹
in Fig. 2 with the revolving disc or wheel removed-Fig. 2 is a sectional elevation
through centre of pump or fan with the driving arrangement-Fig. 3 is a part
sectional plan through line (PD) in Fig. 1, and Fig. 4 is an elevation of my improved
centrifugal pump or fan through line A¹ B1 in Fig. 2.
The revolving disc or wheel A of the pump or fan is enclosed between the cheeks B
provided with the flanges T secured together by the bolts C. The cheeks B forming
the casing are provided with the inlet passage D and the outlet passage E. The inlet
passage D is divided into two thoroughfares D2, one on each side to allow of the
liquid or air being supplied to the centre or thereabouts of the revolving disc or
wheel A through the openings V. The thoroughfares D2 are constructed in a spiral
form to direct the liquid or air in a circular manner corresponding with the direction
of the travel or circular motion of the revolving disc or wheel A as indicated by the
arrows, thereby minimising or reducing the retarding action of the liquid or air to the
least possible degree, which increases the lifting power of the pump and the blowing
power of the fan, and reduces the power requisite to drive the same. The revolving
disc or wheel is mounted on the spindle or shaft G held in the stuffing boxes H on
the sides or cheeks B of the pump or fan and the bearings I mounted on the bed-
plate J. The spindle or shaft G is fitted with the pulley K, by which the pump or
fan is driven by a strap or belt from any convenient source. If desired the pulley K
can be substituted by spur or other gear. The pump or fan cheeks B are provided
with the feet L to secure the same to the bed-plate J by bolts or their equivalents, thus
making the whole self-contained. The revolving disc or wheel A is constructed in
the ordinary manner with the circular or segmental blades or vanes M. To reduce
back-pressure on the circular or segmental blades or vanes M to a minimum, the
latter are provided near their extremities with the curved projections P; the edges of
which are turned to the radius of the point or projection R on the cheeks B. When
the disc or wheel A rotates and each curved projection P passes the point or
projection R dividing the outlet passage E from the central portion of the pump
or fan the bulk of the circular or segmental vane and the passage S between each
are released from the pressure of liquid or air in the outlet passage E.
Having now particularly described and ascertained the nature of my inven-
tion and in what manner the same to is be performed I declare that what I
claim is :-
1. In centrifugal pumps and fans the use construction and arrangement of the spiral
inlet passages D2 substantially as described and shown for the au

page_text: 2. In centrifugal pumps and fans the use of the projections P in combination with
the blades or vanes M and the projection R for the purpose specified.
Dated the 18th October 1889
EDMUND CHADWICK,
Agent.