Improved Hydraulic Gas Compressing Apparatus.
Year: 1899

page_text: Date of Application, 23rd Nov., 1899-Accepted, 23rd Dec., 1899
Improved Hydraulic Gas Compressing Apparatus.
I, ALBERT SCHOLL, Engineer, of 11, Tullastrasse, Mannheim, in the Empire of
Germany, 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 an arrangement of a gas pump, in which liquid valves
or seals are employed in place of metallic valves on which the gases have an
injurious effect. The distinguishing feature of the arrangement is that when
the gas is drawn into the compression apparatus the shutting-off fluid, which the
gas has to pass through, does not remain at the same level in the suction-valve
chamber, but diminishes continuously during the period of suction, finally dis-
appearing altogether, so that, when the period of pressure begins, the compression
commences with an initial pressure, which is the same as that in the suction pipe.
The apparatus constructed according to this invention for drawing up and
compressing gas is illustrated in Figs. 1 to 6 of the accompanying drawing. The
peculiar feature thereof is that the lower end of the cylinder is connected by
means of a double bend or curvature; with the suction valve chamber c. The
effect of this is that the liquid medium actuated by the piston constitutes at the
same time the shutting-off liquid for the suction valve, therefore the height of the
column of liquid in the suction-valve chamber is dependent upon the position of
the pump-piston. At the same time the objectionable space above the level of
the liquid in the suction valve chamber is reduced to the minimum, which is not
at all the case in the arrangements introduced hitherto. The pump piston a
which, according to the drawing, moves upwards and downwards in a cylinder b
and has a small space allowed it for radial movement, could obviously be replaced
by one which is quite tight, or by means of a diaphragm. The action of the
apparatus is hereinafter (lescribed with reference to the drawings.
Fig. 1 represents the position of the pump-piston at its lowest point at the end
of the period of pressure, during which the gas has been compressed in the con-
nection pipe g, as also in the pressure pipe f and has passed through the shutting-
off liquid in the pressure valve chamber e into the pressure pipe f. In consc-
quence of the extra pressure produced in the connection pipe "g the shutting-off
fluid is forced into the suction pipe as well as into the pressure valve chamber e,
whilst the suction valve chamber c is completely filled with shutting-off liquid.
In Fig. 2 the piston a has been raised, and so much shutting-off liquid drawn up
out of the suction-valve chamber, and the suction pipe b, that the pressure of the
gases in the connection pipe g falls to that in the suction pipe, so that the shutting-
off liquid is at the same height in c as in d and, in consequence of the reduction
of pressure, a corresponding quantity of fluid passes out of the pressure valve
chamber e into the connecting pipe g.
As soon as the piston has reached the position shown in Fig. 3, the pressure of
the gases in the connecting pipe g, as well as in the suction valve chamber c has
fallen so much below the pressure in the suction pipe d that the column of liquid
in the suction pipe is completely got rid of and the gas to be drawn up begins

page_text: to pass through the shutting-off liquid in c in the form of bubbles and, in this
manner, reaches the space in the suction valve chamber c, which is not filled with
liquid, and the pipe g, whilst the shutting-off liquid passing out of the pressure
valve chamber into the pipe g rises to a height corresponding to the diminution
of pressure in c and g.
Fig. 4 in which the piston has reached its highest position shows at once how
here until the end of the period of suction the level of the column of liquid to be
passed through by the gases drawn in is reduced to the lowest point, so that
here, the pressure in the suction pipe, as well as that in c and can be completely
balanced.
In Fig. 5 the piston is lowered so far, that a corresponding quantity of liquid
has been pressed towards e and d. At the same time, the compression in the
connecting pipe has proceeded so far that the pressure therein is the same as
in f.
Fig. 6 shows the piston in a still lower position, in which the compression of
the gases in g has increased so far that the shutting-off liquid in the connecting
pipe g is forced entirely into the chamber e and gas compressed in g now passes
through the liquid in the chamber e into the pressure pipe f.
As soon as the downward stroke of the piston is completed, the piston is again
in its lowest position, as shown in Fig. 1, which at the same time, illustrates
the termination of the period of pressure.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
.
A hydraulic gas compressing apparatus, the distinguishing feature of which is
a suction valve, so connected with the pump-cylinder, that the shutting-off liquid,
the level of which in the suction valve chamber is dependent on the position of
the piston, is reduced to the lowest point, during the period of suction, rising
correspondingly during the period of pressure, until the suction valve chamber
is again filled with shutting-off liquid, before the beginning of the period of
suction, in order to reduce as far as possible the space occupied by the compressed
gas at the end of the period of pressure.
Dated this 23rd day of November 1899.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.