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Патент USA US3053257

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Sept. 11, 1962
Filed June 24, 1959
Patented’ Sept. 11, 1962
the volume of air so vented may be very small. This in
itself is a desirable condition. The air operating against
Grant D. Bradshaw, Beaver, Pa., assignor to Bradshaw
& Company, Pittsburgh, Pa., a corporation of Penn
Filed June 24, 1959, Ser. No. 822,590
6 Claims. (Cl. 126-110)
the thermostat 14 will cause the thermostat to close a
circuit to the heater if the temperature of the air falls
below a predetermined point. Thus the escaping air from
the nozzle 15 with the thermostatic control 14 assures
the maintenance of a predetermined temperature in the
air. This temperature is kept at a point where the vapor,
such as the moisture vapor in the air, remains in a vapor
This invention relates to the use of compressed gases in 10 phase and cannot condense. The expansion which occurs
which liquid in the vapor phase may be present, and is
at the nozzle 15, simulates the expansion that occurs in
for a method of and apparatus for preventing the forma
any of the tools connected to branches 8, 9 and 10, and
tion of condensate in such a system.
therefore if the temperature is kept warm enough to pre;
The invention is especially applicable to the elimina
vent moisture at the discharge side of the bleed ori?ce or
tion of condensate in compressed air which is supplied to 15 nozzle 15, it will likewise prevent the condensation of
air-driven tools, and will be particularly described in this
moisture when the ‘air expands into tools connected to
connection, but it will be understood that this is by way
any of the branch pipes. At the same time heat Will not
of illustration and does not limit the invention to such
be supplied when it is not needed, and the air will be pre
vented from being heated to an unnecessarily high degree.
Air from a compressor is generally passed through a
If the ambient temperature falls, increasing the rate at
cleaner before it is‘ carried through pipes or tubes to the
which the air or other gas loses heat in the system, the
tools where it is used. The cleaner functions to elimi
temperature drop will be re?ected at the nozzle 15, cans
nate edirrt and foreign substances and liquid that may be
ing the thermostat to increase the heating current to the
present as condensate at that time. However, moisture
heating unit 6. Thus the conditions will be stabilized
in the vapor phase will be carried through the cleaner. 25 irrespective of fluctuations in the ambient temperature,
As the air loses heat of compression, or outside tempera
or to changes that occur in the temperature drop in the
ture drops, or encounters a place where the line pressure
gas through radiation, expansion, or otherwise.
drops and expansion occurs, or at the tools themselves,
While I have shown and described one particular sys
resulting in a drop in temperature, this vapor may con
tem, it will be understood that various changes and mod
dense and the resulting water be objectionable or inter 30 i?cations may be made within the contemplation of my
fere with the operation of the tools, or in exposed lines in
invention and under the scope of the following claims,
cold Weather such condensate may freeze and the result
and that various re?nements may be included.
ing ice interferes with the intended use of the air or other
I claim:
1. A compressed gas system comprising a source of
The present invention has for its primary object to pro 35 gas under pressure, a conduit for supplying gas to a de
vide a method of and apparatus for preventing such con
densation and assuring that the air or other gas will be
delivered to the apparatus or equipment where it is ulti
mately used or expanded free of condensate. A further
vice for utilizing the same, means for heating the gas as
it flows from the source to the conduit, a thermostat ex
posed to atmospheric pressure for controlling the heater,
and nozzle means for discharging a jet of gas from the
object of my invention is to provide ‘a simple, inexpen
same conduit directly against said thermostat whereby the
sive, self-regulating method of and apparatus for accom
thermostat is affected by the drop of temperature result
plishing this purpose.
ing from the expansion of the gas in said jet.
These and other objects and advantages are secured by
2. A compressed gas system comprising a compressor,
my invention which may be more fully understood by
a cleaner into which the compressor delivers compressed
reference to the accompanying drawing in which the 45 gas and which removes condensate produced by the com
?gure is a schematic illustration of an apparatus embody
pression of the gas, a heater connected to the cleaner into
ing my invention for practising my method.
which the gas ?ows ‘from the cleaner, a thermostat for
In the drawing, 2 designates a compressor which de
controlling the heater and exposed to atmospheric pres~
livers air or other gas through a pipe 3 to a conventional
sure, a duct leading from the heater terminating in a re
gas cleaner 4 in which foreign substances and any previ 50 stricted ori?ce which directs a stream of gas against the
ously condensed moisture or liquid are removed. Ac
thermostat whereby the thermostat is affected by the tem
cording to the present invention the air, after leaving the
cleaner through pipe 5, passes through a heater 6 before
perature drop produced by the expansion of the stream
of compressed gas emerging from the ori?ce, and a branch
entering the pipe 7 from which lead one or more branch
pipe for supplying gas to a device for utilizing the same
pipes ‘8-, 9 and 10 that deliver the compressed air or other 55 leading from the duct at a point between the heater and
gas to the tools or other appliances in which the com
the ori?ce.
pressed gas is used, these tools or appliances being sche
3. The method of avoiding condensation of vapor in
matically indicated at 8', 9' and 10' respectively. The
a system for transporting and utilizing a compressed gas
heater may be of any suitable form, preferably compris
which comprises heating the compressed gas in the system
ing a casing containing insulation, and in which there is 60 to a temperature above the temperature at which Water
a resistance heating coil as indicated at 11. Current is
vapor therein will condense upon sudden reduction in the
supplied to the heating coil through wires 12 and 13 con
gas pressure to atmospheric pressure, continuously bleed
nected to a source of current (not shown). The Wire 18
is connected to the source of current through a thermostat
ing some of the gas from the system through a continu
ously open restricted bleed ori?ce positioned to maintain
14. According to the present invention the pipe 7 is con 65 circulation through the system, and regulating the heat
tinued beyond the last branch pipe 10' and terminates in
ing of the gas by the decrease in gas temperature result
a small restricted nozzle or bleed ori?ce 15 that directs
ing from the expansion of the gas upon its discharge from
a current of air against the responsive element 14 of the
the ori?ce.
4. The steps in the method of utilizing compressed air
With this arrangement the air leaving the ori?ce 15 70 in an appliance which comprises moving air which has
is at the end of the system so that it maintains a con
been compressed from a compressed air source through
tinuous circulation of air through the system, although
a heater and a duct to a continuously open bleed ori?ce
to maintain a continuous ?ow of air under pressure
leaving the ori?ce to control the heater and maintain the
temperature of the air directly upon discharge thereof
pliance to be supplied above the temperature Where mois
ture contained in the air will condense in the appliance.
6. In the method of utilizing compressed air in an air
operated appliance to prevent condensation of moisture
in the appliance upon expansion of the compressed air
in the appliance the steps which comprise conducting air
from the ori?ce at a temperature above that at which
under pressure through a duct to the appliance, continu
moisture vapor in the air will condense at the discharge
ously bleeding some of the air from the duct to preclude
stagnation of the air in the duct, maintaining the temper
through the duct, utilizing air for the appliance by with
drawing it from the duct intermediate the heater and the
ori?ce,_and utilizing the temperature drop of the air upon
side of the ori?ce, and utilizing the temperature drop of
air upon discharge from the ori?ce to control the tem 10 ature of the compressed air above the temperature at
which moisture will condense in the appliance upon ex
and to said ori?ce.
pansion of the air utilized in the appliance, and utilizing
5. In a system for utilizing compressed air, a source
the temperature drop in the air which is bled from the
of air under pressure, an air heater through which air
duct to control the temperature of the compressed air in
passes from said source, a duct for carrying air from the 15 the duct.
heater, the end of the duct remote from the heater hav
ing a bleed ori?ce therein, a pipe leading from the duct
References Cited in the ?le of this patent
intermediate the heater and the bleed ori?ce for supplying
air to an appliance, and temperature-responsive means
Thomson ____________ __ Apr. 11, 1893
against which the discharge of air from the bleed ori?ce 20
perature of the compressed air supplied to the appliance
impinges directly for controlling the heater for maintain
ing the temperature of the air upon expansion in the ap
Short _______________ __ Oct. 20, 1896
Kerlaouezo et al. _______ __ Apr. 9, 1929
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