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Jan. 14, 1947.
J. |_. HIGGINS
2,414,150
PNEUMATIC CONVEYER
Filed Feb. 15, 1945
via:
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Immyroa
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BY
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Patented Jan. 14, 1947
UNITED STATES PATENT OFFICE
2,414,150
PNEUMATIC CQNVEYER
_
'é‘ohnL. Higgins, Chicago, Ill.
Appiication February 15, 1945, Serial No. 578,056
4 Claims.
(Cl. 302-62)
1
2
This invention relates to pneumatic conveyer
apparatus and will be described as applied to an
ventional type of receiver wherein'the ashes are
led into the receiver in a tangential manner as
is well understood in the art. Under the receiver
i2 is the conventional conical hopper tank l3
which at times is closed by a swinging door I4
abutting
inclined opening in a cupola inlet
ash conveyer apparatus such as used by large ‘
steam power plants. However, it will be'appre
ciated that the invention has application to other
pneumatic conveyer apparatus wherein similar
problems are encountered and continuous, con
veyor action is desired.
iii of another coacting bin hopper tank It. The
bin hopper tank it has a conventional swinging
In many pneumatic ash conveys-rs such as used
discharge gate’ H. which may be arranged to dis
by power plants, the ashes must be taken from 1O charge directly into a dump car, storage tank,
the ash pits located under the boilers to receiver
or it may be arranged to connect with a sluice
tan-ks mounted at considerable heights at dis
pipe to carry ashes into a convenient dump. On
tant points from the power plants, where the
top of the closed bin to is an upstanding pipe l9
ashes may be disposed of by gravity into dump
connected to a conventional Venturi pipe 20
cars on a railroad siding or sluiccd through a 15 which in‘ turn is connected to a tangential pipe
discharge line into a dump. This arrangement
2! leading into a dust separator 22. The dust
necessitates long conveyer pipe lines extending
upwardly toward the receiver.
separator is emptied in a conventional manner
and then the operation resumes. When the vac- ‘
uum, is shut o? for this reason, the ash in the
ceiver 52 which draws ashes through the lines‘ I10
and H and deposits them‘ in the“ conical hopper
tank 23 of the‘ receiver ttancl" through the door
through the pipe 23. A steam pipe 24 connects
The conveyer apparatus is used‘ periodically
to the primary injector chamber 25 having noz
when the boiler room helper or ash man is in
es 26 coacting with the venturi 2!). When steam
structed to empty the ash pit. In the conven
is permitted to enter the chamber 25 by means
tional form of pneumatic conveyor apparatus uti
of an electrically controlled valve 21, which may‘
lizing a single receiver tank and vacuum system,
be located at'any desirable location, the jets of
the vacuum system operates on an “on cycle” of
steam from the nozzles 26 coacting‘with the ven
about two minutes and an “off cycle” of one min 25 turi 2% cause a suction in the bin 16 which closes
ute, in order to provide a time interval for re
the spring. opened valve to, which is ‘normally
moving ashes in the receiver hopper tank which
open to provide a vent to the atmosphere, and
is under vacuum when being ?lled. During the
the suction therefrom is transmitted through the
off time interval, this receiver hopper is emptied.
swinging door it to create a suction in there
upwardly extending conveyer line drops down
wardly and packs in the pipe making resumption
of the ash flow difficult and wasting the work
already expended on the ashes. This di?iculty “
is augmented by the continued piling of ashes in
pipe lines except that the receiver l2 has been
separated from the bin it by the hopper tank I3,
the inlet opening of the pipe line if the ash man
continues his labors when the vacuum is shut oil’.
It is the particular object of the present in
vention to avoid the dimculties of the “oiT and
on” system of operation and to provide means
whereby the continuous operation of the pneu
matic conveyor is permitted.
Other objects and bene?ts will be disclosed in
the following desc
ions and rawing in which:
When this pneumatic removal of ashes has con
tinued for su?icient time to nearly ?ll the bin IS,
the electrically controlled valve 21 is shut o? au
tomatically through the automatic time switch
81%, thus stopping the ?ow of steam through the
venturi 2e, and before this how of steam is com
pletely stopped, another electrically controlled
-
Fig, l is an elevation view partly in section of
the receiver-separator apparatus employing the
invention; and
Fig, 2 is a top plan view thereof.
Now referring to the drawing: I designate, by
the numeral it in dash lines, the course of the
incoming ash line which, of course. will start at
a level far below the receiver apparatus, The nu
meral ! E designates the tangential inlet pipe of
this ash line to the receiver i2. This is a con
:4 into the bin tank it. Thus far the use of the
venturi ‘it to create a suction in the lines Hi and
H is a conventional means to convey ashes in
valve 28 in the pipe line 29 connected. to the
supply line 24, is automatically opened by the
switch 34 and electrical connections 35 and the
steam emerging from this line 29 through the
Ci A v
nozzle 39 coacting with another venturi 3| con
tinues to create suction in the receiver I2 ‘through
the pipe 32. When this suction is applied through
the pipe 32 to the receiver E2, the suction thus
created closes the swinging door Hi and the ashes
from the lines it and H are deposited in the
hopper tank I3 of the receiver it. During this
2,414,150
4
3
to, means for closing said communication, means ‘
period of time, the ashes in the bin tank It are
connected with the discharge chamber for creat
ing suction in said receiving and discharge cham
controlled valve t8, then valve 28 is shut 01f,
bers for sucking material into the receiving
the valve 2‘! opened, and the Venturi 20 picks up
the vacuum load to thus continuously draw ashes O1 chamber for discharge therefrom into the dis
charge chamber, and means for creating suction
through the lines In and II.
in the receiving chamber upon closing of the
Thus I avoid the disadvantage of the ashes
communication between the chambers to con
falling back in lines Ill and II, save the energy
tinue the supply of material to the receiving
created by the inertia of the ashes in these lines,
discharged by gravity upon release of the spring
and remove ashes continuously. When the vacu
10
chamber.
I
3. In a conveyer of the character described, the
combination of receiving and discharge cham
um in the receiver l2 created by the Venturi 25]
is transmitted through the pipe 32 to the Venturi
3|, the hinged valve 33 on the end of the Venturi
3| closes and e?ectively cuts off the connection
between the venturi 20 and 3|. By this arrange
ment, it will be appreciated that I have combined
dual Venturi operations to avoid the difficulties
and disadvantages when a single venturi and re
bers having means of communication therebe
tween and adapted for the passage of material
from said receiving chamber to said discharge
chamber, said receiving chamber being adapted
to be connected with a fluid conduit for supply
of material thereto, means for closing said com
munication therebetween, dual suction devices
ceiver is used and provide a continuous ash re
moval conveyer.
_
20 one of which is connected with the discharge
chamber for creating suction therein and caus
Having thus described my invention, I now
ing material to be drawn into the receiving cham
claim as new?
ber and discharged therefrom into the discharge
1. In a pneumatic ash conveyer, a conveyer
chamber, and the other suction device being con
pipe line from an ash pit extending upwardly, a
hopper bin tank having a swinging discharge 25 nected with, the receiving chamber and having
means for automatically creating suction therein
gate mounted at a height considerably above the
upon the closure ofcommunication between the
ash pit, a receiver attached to the conveyer pipe
chambers to continue the supply of material to
having a dump hopper and swinging discharge
said receiving chamber while the material is be
gate mounted above the bin tank with the dump
ing withdrawn from the discharge chamber.
hopper arranged to discharge into the bin tank,
4. In a conveyer of the character described,
a dual Venturi suction device mounted on the
the
combination of a hopper bin tank having a
bin tank with one suction device arranged to
swinging discharge gate, a receiver adapted to be
create suction in the receiver, the arrangement
of the suction connections and the swinging dis
connected with a ?uid conduit for supply of ma
terial thereto, said receiver having a dump hop
charge gates providing means to draw ashes
per and a swinging discharge gate and mounted
above the bin tank and arranged to discharge
through the receiver into the bin tank with one
of the suction devices and to draw ashes through
into said tank, dual Venturi suction devices con
nected with the bin tank with one suction device
the other suction device, and means to control
arranged to creat suction in the receiver, the ar
the operation of the two suction devices to permit 40 rangement of the suction connections and the
dumpingof the ashes in the bin while continu
swinging discharge gates providing means to draw
ing to draw ashes from the conveyer line into
material through the receiver into the bin tank
the receiver hopper, thereby providing a continu
by the action of one'of the suction devices and
ous ash conveying system.
to draw material into the receiver to the discharge
the receiver and. into the receiver hopper by
43
.2. Ina conveyer of the character described, the
combination of receiving and discharge chambers
having means of communication therebetween
adapted for the discharge of material from said re
ceiving chamber into said discharge chamber, said ,
gate in closed position by the other suction de
vice, and means for controlling the operation
of the suction devices to permit dumping of,
the material in the tank while continuing to draw
receiving chamber being adapted to be connected
with a ?uid conduit for supply of material there
tinuous manner.
material into the receiver substantially in a con
JOHN L. HIGGINS.
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