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Патент USA US2109743

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March l, 1938.
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Q_ B_ FAVERTY ET AL
FUEL. vAPoRIzING SYSTEM
Filed July 30, 1932
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2,109,743
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_ Patented Mar. 1, 1938
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UNITED STATES PATENT oFFlcE
aioaus
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' FUEL vsroluzme SYSTEM
Clyde B. Faverty, Henry J. Smith, and Peter C. L.
Van Bueren, Chicago, Ill., assignors to Mark C.
Bates, chicago, n1.
Application July 30, 1932,` Serial N0. 627,162
6 Claims.
Our invention relates in general to vaporizing
devices for liquid hydrocarbons. It relates more
in particular to an improved method of con
trolling the operation of aspirators used in con
5 nection with such devices.
The invention has its greatest application to a
vaporizing apparatus wherein the liquid hydro
carbon is vaporized in a vaporizing chamber and
is withdrawn from the chamber by means of an
aspirator .consisting of an air nozzle discharging
into a Venturi tube, the connection from the
vaporizing chamber being 'at the discharge end
of the air nozzle. A vaporizer of this character
is shown in the copending application of Charles
(Cl. 48-144)
'I‘he vaporizing chamber I0 is adapted to con- '
tain a-predetermined level of liquid hydrocarbon
I I, supplied to it through a. supply pipe I2. This
pipe is connected to a float chamber I3 and the
float chamber in turn is connected through a. Ul
pipe I4 to a fuel supply tank I6, the drawing also
showing a strainer I1 in the line. A balance
line I8 is provided connected above the iloat in
the iloat chamber and to the vaporizing cham
ber I0, whereby the same vapor pressure is main
tained in the float chamber as in the vaporizing
chamber to- which the fuel in liquid form is sup
plied.
A conduit I9 receives hot gases from a pilot
burner 2|, the hot gases being controlled to 15
of which the copending application of French, descend in the conduit and pass up through thel
Serial 684,656, filed August 11, 1933, is a division. ‘ contained liquid in the vaporizing chamber
15 A. French, Serial No. 603,491 filed April 6, 1932;
Such a vaporizer will operate over a consider
able range depending upon the amount of heat
desired, but cannot be controlled to produce a
combustible mixture at rates appreciably below
those for which the apparatus was designed.
The principal object of our invention is to
make it possible in a vaporizer of this character
25 to supply a combustible mixture in relatively
large amounts or in relatively very small amounts
without impairing the character of the mixture.
Another object is to modify the action of an
aspirator in a device of this character whereby
30 the amount of air may be decreased but the
velocity thereof maintained substantially con
stant.
Another object is to make it `possible to cut
down the amount of air without substantially de
35 creasing the amount of vaporized hydrocarbon
withdrawn from the vaporizing chamber.
Other objects and features of the invention
will be apparent from a consideration of the
following detailed description taken with the ac
40
companying drawing, wherein
Fig. 1 is a transverse sectional View, shown
partly schematically, of a vaporizing device ern-->
bodying the features of our invention;
Fig. 2 is a slightly enlarged fragmentary
45 sectional view of‘the needle valve;
Fig. 3 is a fragmentary sectional view showing
the modified arrangement of the control mecha
nism; and
Fig. 4 is a sectional view taken along the line
50 4--4 of Fig. 3, looking in the direction of the
arrows.
In order that the details of the invention will
be more manifest as `they apply to the operation
of the vaporizer, we shall ñrst describe the
vaporizer itself as >it is disclosed in the drawing.
through a bubble plate 22, formed with a plu
rality of apertures through which the hot gases
pass. An air line 23 supplied with air under pres
sure from a suitable source exhausts through a
nozzle 24 into a Venturi tube 26 connected to a
vapor delivery line 21 connected with the main
burners (not shown). The vaporizer chamber is>
connected by a suitable passageway 28 controlled 25
by butterfly valve 29 to the Venturi tube, an an
nular enlarged portion 3| being provided whereby
the vaporized fuel from the vaporizing chamber
is withdrawn from the passageway 28 by the
suction induced by air ñowing through the 30
Venturi throat at high velocity. The mixed air
and vaporized hydrocarbon then passes through
the line 21, whence it is burned in a suitable way
and by means of -suitable burners.
A short pipe formed in the shape of an elbow 35
32 extends into the vapor delivery passageway
and connects to a burner nozzle v33, the discharge
end of which is adjacent the opening of the
conduit I9.
A relatively small amount of a com
bustible mixture is withdrawn from the main 40
delivery line and delivered to the burner nozzle
33 where it is burned, the hot gases passing
through the conduit I9, as previously described,
and causing a 'vaporization of the liquid hydro
carbon. An adjustable cap 34 is provided over
the nozzle 33 which furnishes means for lighting
the pilot light and also may be controlled to
admit additional air, should the additional air
be required for any purpose.
The volume of combustible mixture delivered 50
to the main burners is determined by the amount
of air delivered through the line 23 and also to
some extent by the setting of the butterily valve
29. In general, however, the movement of air
is the main control, as it is only by moving the. 55
2,109,748 _ .
air that the aspirator action _is obtained and
movement of hot gases promoted through the
vaporizing chamber.
i
We have discovered that by means of a nozzle
control rod 36 extending through the center
portion of the nozzle longitudinally thereof, we
can so control the movement of air therethrough
as to have a very much more eßective control of
the burner as a whole. In the form shown, .the
10 rod has a tapered portion 36a and a threaded
portion l1 extending through a threaded boss 3l
forming a part of the frame and adapted to be
turned by a hand wheel 39. By inserting the
rod, we cut down the size of the opening in the
15 air nozzle, that is the cross Sectional areaI thereof
to discharge less air when less air is needed, but
maintaining the velocity thereof around the out
side of the air stream. This is the only portion
of the air which has any immediateeifect upon
20 the aspirating action, because it is the only por
tion in contact with the body of vapor fuel sur
rounding the stream of air. When the rod is
adjusted to its most advanced position, there will
be only a relatively small ring of air discharged
25 and this air, much less in volume than in the
setting of Fig. 2, will travel at the same or greater
velocity than the air in Fig. 2 and cause at least
as much aspirating action, that is, make it
possible to Withdraw the same volume of vaporized
30 fuel, should this be necessary. The amount of
fuel withdrawn is then controlled by the setting
of the butterfly valve 29.
It appears clear from the drawing that the
rod can be still further withdrawn from the air
35 delivery nozzle so as to have no effect whatso
ever upon the delivery of air therethrough.
Moreover, we may produce the rod without the
taper and may, of course, employ other means for
adjusting the same.
In the forms 'shown in Figs. 3 and 4, we also
40
cut down the volume of air without cutting down
the velocity thereof. In the form previously
shown, the proportions of air and vaporized hy
drocarbon were modified by control of the posi
45 tion of the rod. In the form We are now consid
ering, however, the relative proportions remain
substantially the same, the volume only being de
struction to obtain substantially the same re
suit. We wish to call attention to the fact that
the portion of the cone indicatedA by the refer
ence character |35 does not enter into the con
trol action, except for the purpose of cutting
down eddy currents which would result if a per
fectly square or abrupt shoulder were presented
`to thegases.
We have described our invention in detail to
permit those skilled in the art to practice it,>and 10
have shown it with a specific type of vaporlzer
with which it co-operates in a very eilicient man
ner. We do not restrict ourselves, however, to
these features as shown and described, the in
vention being limited only by the scope of the>
appended claims.
What we claim as new and desire to protect
by Letters Patent of the United States is:
l. In combination, a vaporizing chamber,
means for maintaining a supply of liquid fuel 20
in the chamber, a Venturi tube, a connection „
from the Venturi tube to- said vaporizing cham
ber, an air discharge nozzle communicating with
the Venturi tube, means for changing the effec
tive cross sectional area of said air delivery noz
25
zle, and means for delivering hot vgases below
the surface of and through the fuel including
means for withdrawing a combustible mixture
as the gases leave the Venturi tube, means for
burning said combustible mixture, and means for 30
delivering the resulting products of combustion
to the vaporizing chamber below the surface
of the liquid fuel.
2. In an oil vaporizer, a vaporizing chamber,
means for maintaining a body of oil in the
chamber, as aspirator including an air delivery
nozzle and a Venturi tube, a connection near
the nozzle between the Venturi tube and the
vaporizing cha'mber whereby oil vapors are
adapted to be drawn into the tube and mixed 40
with‘air from said4 air delivery nozzle, means
for passing hot gases of combustion below the
surface of and through-said oil to vaporize a
portion of the same, and a tapered rod longitudi
nally movable in the air delivery nozzle to reg 45
ulate the amount of air delivered to the Venturi
tube and the amount of oil vapor drawn from
creased.
» said vaporizing chamber.
A rod |36 is employed slidably supported in a
l3. In an oil vaporizer, a vaporizing chamber,
50 gland or sleeve |38 and threaded into the central means for maintaining a body of oil in the cham
50
portion of a spider Ill. The rod carries a double ber, an aspirator including an air delivery noz-cone |35, one conical portion extending by way zle and a Venturi tube, a connection near the
into the nozzle |24 and also partially illlingout. nozzle between the Venturi tube and the vaporiz
the annular portion | 3| so that an annular re
ing chamber whereby oil vapors are adapted to
55 stricted passageway |30 is formed in the Ven
be drawn into the tube and mixed with air from
turi opening. As will appear clear from the said air delivery nozzle, a delivery line into which
drawing, when the rod I 36 is adjusted on its the mixture of air and oil vapor is delivered,
`_ threads it not only eiîects the opening |25 between means for withdrawing a portion of the mixed
the cone and the nozzle |24, but also effects the oil vapor and air from said delivery line, a burn
60 cross sectional area of the opening |30. By con
er for burning thewithdrawn mixed oil vapors and
trolling both of these openings together, the vol
ume of combustible mixture delivered to the
line |21 is substantially proportional to the vol
ume of air delivered to the venturi through the
65 opening |25.
'
The vaporizing apparatus per se, with which the
control of Fig. 3 is- employed, may be substan
tially the same as that shown in Fig. 1. Fig. 3
shows a portion of such apparatus and the same
reference characters are employed as employed
in Fig. 1, with the preñx “1" for identification
and to shorten the description.
It will be understood that although we employ
two slanting surfaces together on a single cone,
75 as the drawing shows, we may modify this con~
air, means for delivering the resulting hot gases
of combustion to the vaporizing chamber below
the level of liquid oil therein, and a tapered rod
longitudinally movable in the air delivery nozzle
to regulate the amount of air delivered to the 85
Venturi tube and the amount of oil vapor drawn
from said vaporizing chamber.>
4. In an oil vaporizer, a vaporizing chamber,
means for maintaining a body of oil in the
chamber, means for maintaining a constant oil 70
level in said ch ber, an aspirator including an
air delivery n
and a Venturi tube, a con
nection near the nozzle between the Venturi
tube and the vaporizing chamber whereby oil
vapors are adapted to be drawn into the tube 75
3
8,109,748
and mixed with air from said air delivery nozzle,
and the amount of oil vapor drawn from -said
means for passing hot gases of combustion
vaporizing chamber.
through said liquid to vaporize a portion of the
same, and a tapered rod longitudinally movable
in the air delivery nozzle to regulate the amount
of air delivered to the Venturi tube and the
amount of oil vapor drawn from. said vaporizing
chamber.
5. In an oil vaporizer, a vaporizing chamber,
10 means for maintaining a body of oil in vthe
chamber, means for maintaining a constant oil
le-vel in said chamber, an aspirator including an
air delivery nozzle and a Venturi tube, a connec
tion near the nozzle between the Venturi tube
15 and the vaporizing chamber whereby oil vapors
are adapted to be drawn into the tube and
mixed with air from said air delivery nozzle, a
delivery line into which the mixture of air and
oil vapor is delivered, means for withdrawing a
portion of the mixed oil vapor and air from said
6. In combination in a fuel vaporizer, a va
porizing chamber containing a body of liquid oil,
a- pilot burner, means for passing hot gases of
combustion `below the surface of and through
the oil in the vaporizlng chamber to vaporize
a portion thereof, an aspirator for withdrawing
vapors from said vaporizing chamber, said as
pirator including a forcing nozzle and a Ven
turi tube, means for delivering air through said
forcing nozzle whereby to Withdraw vapors from
the vaporizing chamber and mix the same with
air, a passageway for receiving the mixed air
and vapor, means for trapping a portion of the
mixed air and vapor and delivering the same to
the pilot burner, and means for changing the
cross sectional area of said forcing nozzle where
by the amount of combustible mixture delivered
to said passageway and to the pilot burner is
delivery line, a burner for burning the withdrawn
modified in proportion, and whereby the rich
mixed oil vapor and air, means for delivering
the resulting hot gases of combustion to the va
‘porizing chamber below the-level oi’ liquid oil
therein, and a tapered rod longitudinally mov
able in the air delivery nozzle to regulate the
ness of said mixture remains substantially con-`
stant independent of the amount thereof pro
amount of air delivered to the Venturi tube
5
10
15
20
duced. i
CLYDE B. FAVERTY.
HENRY J. SMITH,
PETER C. L. VAN BUEREN.
25
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