An Improved Gas Exhauster.
Year: 1889

page_text: Date of Application, 8th Oct.. 1889
Complete Specification Left. 8th July, 1890-Accepted, 9th Aug. 1890
PROVISIONAL SPECIFICATION.
An Improved Gas Exhauster.
I, GEORGE EDWARD SAVILLE of Millwood, Todmorden in the County of York,
Gas Engineer, do hereby declare the nature of this invention to be as follows:-
The improvements to which this invention relates are principally applicable to
double cylinder reciprocating gas-exhausters or air blowers and consist of a novel
form and arrangement of valve box, valves, and gas passages.
To carry out my invention 1 employ as a motor, by preference, a double cylinder
horizontal steam engine, the piston rods of which are lengthened and form also the
piston rods of the exhauster, the cylinders of which are fixed on the same centre line
as the steam cylinders.
A stud projecting laterally from the piston-rod crosshead carries one end of a
wheel
connecting rod, the other end of which is connected to a crank on the fly
shaft.
The valve chest of the exhauster cylinders occupies a great portion of the space
between the two cylinders and is divided into two parts by a horizontal partition, the
two spaces thus formed communicating with the gas inlet and outlet pipes.
The ports opening into or out of the cylinders adjoin openings in the partition in
the valve chest, whereby the valves, which have faces formed at right angles to one
another, are capable of opening or closing the cylinder port and the adjoining orifice
in the partition simultaneously.
The slide valves of the exhauster are actuated by means of eccentrics mounted upon
the main or fly wheel shaft.
The two compartments of the valve chest are enlarged at the ends of the chest to
the full size of the gas inlet and outlet pipes to facilitate the free passage of the
stream of gas.
WILLIAM JAMES BAKER,
2, New Street, Huddersfield, Agent for the Applicant.
COMPLETE SPECIFICATION.
An Improved Gas Exhauster.
I, GEORGE EDWARD SAVILLE, of Millwood, Todmorden in the County of York,
Gas 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 improvements to which this invention relates are principally applicable to
double cylinder reciprocating gas exhausters or air blowers, and consist of a novel
form and arrangement of valve box, valves, and gas passages.
To carry out my invention 1 employ a motor, by preference a double cylinder
horizontal steam engine, the piston rods of which are lengthened and form also the
piston rods of the exhauster, the cylinders of which are fixed on the same centre line
as the steam cylinders.
A stud projecting laterally from the piston rod crosshead carries one end of
a connecting rod, the other end of which is connected to a crank on the fly wheel
shaft.
The valve chest of the exhauster cylinders occupies a great portion of the space
between the two cylinders, and is divided into two parts by a horizontal partition,
the two spaces thus formed communicating with the gas inlet and eduction pipes.
The ports opening into or out of the cylinders adjoin openings in the horizonial

page_text: partition, in the valve chest, whereby the valves which have faces formed at, or
approximately at right angles to one another, are capable of opening or closing the
cylinder ports, or of forming connection between such ports and the adjoining
orifice in the partition for the inlet of gas.
These slide valves of the exhauster are actuated by means of eccentrics mounted
upon the main or fly wheel shaft.
One or both of the two compartments of the valve chest may be enlarged at the
ends of the chest to the full size of the gas inlet and outlet pipes to facilitate the free
passage of the stream of gas.
In order to enable this invention to be fully understood I will proceed to
describe the same with reference to the accompanying drawings in which Figure 1
represents a plan of my improved gas exhauster combined with a horizontal steam
engine, the valve chest of the exhauster and the gas exhausting cylinders being shown
in section.
Figure 2 represents a transverse sectional elevation of the gas exhausting
cylinders and valve chest, and Figure 3 a longitudinal sectional elevation of the
same valve chest.
Similar letters refer to similar parts in all the drawings.
The steam cylinders by means of which the exhauster is actuated are represented
at A A, the main driving shaft at B B, and the balanced disc cranks at CC,
which cranks receive motion from the connecting rods EE coupled to the piston
rod crossheads F F, which are mounted upon slide blocks moving on the slide
bars G G.
The exhauster cylinders are represented at H H and the pistons thereof at 0 0,
the gas valve chest at J and J, and the slide valves at K K.
The openings or gas passages from the lower to the upper compartment of the valve
chest are represented at L L, and the gas poris for the admission or emission of gas
into or out of the exhauster cylinders are represented at M M.
The inlet pipe for the supply of gas to the exhauster is represented at P and the
outlet pipe at N.
The pistons of the exhauster being put in motion by means of the steam engine
a partial vacuum is formed in the exhauster cylinders, to supply which vacuum
a flow of gas immediately takes place through the inlet pipe into the lower
compartment of the valve chest J, which may be called the inlet compartment.
The gas then passes up through the orifice L into the valve K operating in the
upper (or outlet) compartment J, and thence through one of the gas ports M into
the cylinder H.
On the return stroke of the piston the indrawn gas is forced out of the cylinder
through the same port by which it entered, into the valve chest J, the slide valve K
being withdrawn by the motion of the eccentric, and thereby leaving the gas port
uncovered. From the cylinder port and valve chest the exhausted gas passes to the
outlet pipe N, to the scrubber, or where required.
The direction of the flow of gas is indicated by arrows.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is,
1. In gas exhausiers, the specially formed valve chest separated into lower and
upper gas compartments (for inlet and outlet respectively) by means of a fixed parti-
tion in which orifices are formed for the passage of gas from the lower compartment
direct to the interior of the chambers of the slide valves, operating in the upper
compartment, and from thence into the gas ports in the exhausting cylinder, sub-
stantially as described and represented in the accompanying drawings.
2. In gas exhausters, the specially formed valve chest which is expanded or enlarged,
as to the gas passage or passages, at one or both ends, to the full diameter of the inlet
or outlet pipe or pipes, for the purpose of allowing a free passage for the flow of gas,
and minimising friction and back pressure.

page_text: 3. The specially formed slide valves K having two working faces at or approxi-
mately at right angles to one another as, and for the purpose, described.
4. In gas exhausting apparatus, the general arrangement and construction of the
slide valves, valve chest, and gas passages combined with the cylinders, and actuated
by means of a steam engine, as described and represented, and whether operated in a
horizontal or a vertical position.
Dated this Sixth day of July 1890
WILLIAM JAMES BAKER,
2, New Street, Huddersfield, Agent for the Applicant.