Improvements in Displacement Pumps for Air or other Gases.
Year: 1892

page_text: Date of Application, 8th July, 1892-Accepted, 13th Aug., 1892
COMPLETE SPECIFICATION.
Improvements in Displacement Pumps for Air or other Gases.
We, JOHN HENRY HARGREAVES, and JOHN GEORGE HUDSON, of the Soho
Iron Works, Bolton, in the County of Lancaster, Engineers, 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,
that is to say :-
Our said invention has for its object to improve the construction of pumps for
exhausting or compressing air or other gases such pumps being of the class, known
as displacement pumps, in which the air or gas is directly acted on by water or
other suitable liquid which liquid. is itself acted on by a piston or plunger.
An example of our improved construction of pump is delineated on an
accompanying sheet of explanatory drawings which are hereinafter referred to,
Figure, 1, being half plan half section as with the valves and seatings removed
and Figure, 2, a vertical section. The sectional part of Figure, 1, is as at the
upper water level in Figure, 2.
In the improved apparatus the piston or plunger, A, which is of an elongated
form with curved conoidal ends works vertically in a cylindrical pump chamber, B,
placed eccentrically in a larger cylindrical chamber, C, having its lower end
shaped like an inverted dome. The inlet valves, D, and discharge valves, E, are
placed at the upper part of the apparatus, the lower end of the pump chamber, B,
communicating with the valves by a crescent-shaped space, F, partly encircling the
pump chamber, the upper part of which communicates directly with the valves
appertaining to it. The inlet valves, D, are arranged in lateral enlargements, G,
of the upper part of the apparatus, which are provided with flanged openings, H,
for the attachment of pipes or other connections, the valve seatings with their
attached valves and guards being secured in openings formed for them in a
diaphragm, J, cast in the apparatus, by screw spindles, K, bearing up against cross
bars, L, engaging under snugs formed in the casting. The discharge valves, E,
are fitted to the bottom of a chamber or well, M, which may be open-topped as
shown, in some cases, as for example, when the apparatus is applied as the air pump
of a steam engine. The discharge valve seatings with their valves and guards are
secured by screw spindles, N, which bear up against bars, P, extending across the
chamber, M, and engaging between ribs formed on the sides of the chamber.
shown in the drawings, there are four inlet valves, D, and eight discharge valves, E,
for each end of the pump, the inlet valves being arranged on opposite sides whilst
the discharge valves are grouped together in the upper middle chamber, M, which
is of rectangular form. The chambers, G, of the inlet valves, D, are closed by
covers, Q, which are conveniently placed; both the inlet and discharge valves being
accessible with great facility for examination or putting in order. The rod, R, of
the piston or plunger, A, extends up through a gland in a plate, S, forming part of
the bottom of the chamber, M, and also forming a removable cover giving easy
access to the pump chamber, B, and to the piston or plunger, A. The piston or
plunger, A, is made with its middle part truly cylindrical, and it is fitted to work
through a brass sleeve or gland, T, which is held, by a flange or rib formed
externally on it, in the joint between the bottom and upper castings forming the
shell or casing of the apparatus.
As
When the pump is to be used for compressing air or gas or is required to raise
the water accompanying the air in a steam-engine air-pump above the level of the
pump, a cover must be fixed on the chamber. M.

page_text: Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is :-
The construction, combination, and arrangement of parts constituting the improved
pump substantially as hereinbefore described and shown in the accompanying 5
drawings.
EDMUND HUNT,
Applicants' Agent.