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Патент USA US2403578

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July 9, ‘1946.
1 2,403,578 I
Fivled Dec; 5, 1941 '
Patented July 9, 1946
Albert F. Carpenter, chicag'o, Ill.
Application December 3, 1941, Serial No. 421,450 ’
3 Claims. ___(.01. 18372.5)”:
This invention relates to a device for thepre
'vention of vapor lock in gasoline lines and the
like and more particularly to the removal, from
stream of liquid gasoline'in' the gasoline‘ line any
gasoline vapors which are present therein. Pref
erably the device is located adjacent the pump so
that the operation occurs immediately before the
gasoline is-introduc'ed into the pump.
In the speci?c embodiment of the invention il
lustrated herein, an internal combustion engine
a liquid stream, of bubbles or pockets of vapor
which may be formed therein.
An object of the invention is to provide ap
paratus for removing from a liquid stream-any
vapor bubbles which may be formed in the liq
it] is equipped in the usual manner with apar
uid, the removal taking place while the liquid is . _; buretor H, a gasoline pump I 2,-a ?lter l3 and a
being passed through a conduit. The operation is 10 gasoline tank I4. A conduit l5 connects the
particularly suitable for removing bubbles or
gasoline tank with the other elements and per
pockets of gasoline vapor from the liquid gasoline
mits the gasoline to ?ow from the vtank I4
as it is being passed through. the pump for an
through the ?lter l3 and pump l2 to the car
internal combustion engine, thus preventing, va- .~ - buretor II. The conduit l5 may be of any suit
poa- lockin thepump.
15 able construction and normally consists of copper
Another object of the invention is to provide an
tubing of an appropriate size.
{expansion chamber about a liquid passage where
Adjacent the pump ‘I2 is a chamber I5 which
‘by vapors in‘the liquid stream in’ the passage
is disposed about the conduit I5. The chamber
may be removed to the chamber. Still another
- l6 as seen in Figs, 2 and 3 may be cylindrical in
object is to provide a conduit which opens into a 20 shape and equipped with a cylindrical side wall
chamber and which’ is so constructed and ar-'
"and end walls l8 and I9.v 'I'he‘end walls l8 and
ranged as to maintain the level of liquid in the
chamber below or at the same level'with' the
opening in the conduit. A further object is to
provide a closed chamber containing air and be
I!) are sealed to the ends of the side wall I‘! to
provide an air-tight container. As shown, the
end walls l8 and I9 may be provided with an
nular ?anges 20 and 2| which are turnedback
wardly upon themselvesat 22. and 23 to provide
a lip which may be soldered or otherwise sealed
ing arranged about an opening in the passage so
as to receive vapor pockets-or bubbles from the
liquid stream in the passage.
Other features and advantages, of the-inven
tion will appear from the following speci?cation
and drawing, in which--
to the side wall I1. '
' 4
- Figure 1 is a side elevational View of the ap
paratus as connected to an‘ internal combustion
engine; Fig. 2 is a vertical s'ectionalview taken
The side wall I‘! of the casing I6 is provided
with openings‘ at 24 and 25 through which eX
tends the “conduit I5. The side Wall I‘! of the
casing l6 may be provided with annular ?anges
26 and 27 about the openings 24 and 25 and by
this means may be sealed in air-tight relation to
along the line 2-—2 of Fig. l, showingthe ex-v 35 the outer wall of the conduit l5.
pansion chamber about ‘the conduit and Fig. 3_
The upper surface of the conduit 15 within the
is a longitudinal vertical sectional view of the
same chamber,
casing I6 is equipped with a small opening 28
which brings the passage 29 formed by the con
duit l5 into communication with the chamber
5!! formed by the casing IS. The casing I6 is
In the operation of internal ‘combustion’en
gines, the gasoline is ordinarily delivered to the
carburetor by a suitable pump which draws the
secured tothe conduit l5 in airtight relation
gasoline from the-gasoline tank or container and
passes it into the carburetor. Under conditions
therewith ‘and with the chamber 30 provided by
the casing l6 ‘being at least partially ?lled with
of relatively high atmospheric temperature, the
air when the casing is sealed in position. Pref
gasoline, While passing through the conduit or 45 erably the casing is arranged about the conduit
line into the pump or carburetor of the engine,
i5 and sealed in position while the conduit is
tends to vaporize slightly to form innumerable
empty, thus providing a chamber 38 substantially‘
small bubbles or pockets of gasoline vapor within
?lled with air at atmospheric pressure.
the liquid stream.‘ These small vapor pockets
When gasoline is passed through the passage
when drawn into the pump interfere with its op 50 :29 formed by the conduit I5,‘ it may ?ow through
eration and cause what is known as vapor lock, a
the opening 28 into the chamber 30. However,
condition wherein the vapors in the pump pre
the pressure of the air within the chamber will
vent the operation thereof.
prevent the liquid level of the same from rising
The present invention is designed to avoid the
above the level of the opening 28 in the conduit
difficulties of vapor lock by removing from the
!5 and. in. fact, will normally provide a liquid
As the gasoline vapor accumulates in the
level within the chamber substantially below the
conduit IS, the level, as shown, being at 3|.
chamber 30, condensation will occur particularly
chamber at the same time provides an expansion
‘chamber above the opening for receiving gaso
line vapors from the opening 28.
if the casing 16 is not exposed to excessive heat
and the condensed gasoline will flow into the pas
sage 29 through the opening 28 in accordance
with the equilibrium conditions established be
tween the liquid gasoline in the passage and the
air in the chamber 30.
By providing a construction in which an open
‘sealed about 5the' conduit IS ‘with ‘theiopenin‘g
28 providing communication between the passage
'29 formed ‘by the conduit l5 and the chamber '33
vapor bubbles are readily removed through the
opening and need not pass substantially out of
The chamber 30 extends upwardly and down
wardly from the opening 28 in the conduit I5
and while permitting liquid gasoline to flow from
the opening 28 into the lower .portion of the
In the‘ioperation‘of the dev’icéfthe casing vl6 is 10 ing"5in"*?'the upper surface of the'conduit I5 is
open to the 'air"?l1ed chamber 30, the gasoline
formed by the casing l6. The'casihg leis-‘sealed
the line of"‘?ow"'t0 reach the opening 273.
about the conduit I5 With the chamber‘? 3?~beihg 15
?lled with air under substantially atmospheric
pressure. The openings 24 and 25 attire-‘wan
certain embodiments or the invention! it is‘uns
de'rstood’that it is capable of many modi?cations.
"While there "have been‘ shown and described
changes, therefore; in the construction and an
H of the casing It should- ‘be-‘so disposed that
rangement may be made without departing from
the opening 28 in the conduit lt'is in the upper
half of the chamberSll and the chamberip'rovi'd'es 20 the spirit and scope of the invention.
a volume below the opening at least equal to
that'abovethewopeningzv "'
"’ '
1. ‘A‘dévice for‘ythe prevention’ of vapor lock in
When ‘the‘engine 10' is set in operation, the
pump 12 causes“ g'asoline‘to" be drawn‘from‘n the
tank-I4 ‘through the casing‘ 16. As the ease me
passes through ‘the passage“ "in the conduit" l5,
a certain camount'i‘of the liquid gasoline will flow
from ‘the opening zainto~ the chamber ‘at, the
quantity of gasolinewhich'passes ‘through the
gasoline lines comprising, a conduit providing. a
passage 'forfthe" gasoline ‘and being equipped with
a'single small opening in the, upper surfaee there-3
of; a casing received about some "conduit and
sealed thereto; “said casing‘ providing
chamber containing air and communicating, with
said opening and extending upwardly and down
opening 28»'dependihg upon'th‘e degree of vacuum 39 wardly‘therefrrom, said openingfbeing disposed in
vthe"central portion of the chamber whereby at
established‘by the‘puinp and the’air pressure
leastjhalf of_ the volume or the chamber is below
within “"the" closed: chamber '30".
the? air" pres‘:
sure" is increased in the closed ichambér-l'?fby
reasonwof "the decrease in‘ available volume there}
of? ‘air?
the introduction
on‘ ‘the rnquid’
gasolineatfthe the
opening 28 increases untilithisprés ur'eis'7‘equal
opening '28." Under" ordinary conditions in‘ the
operation ‘of the internal combustib
as those used ‘ in ' automobiles; *the eq
pressure ‘between theair ‘in the chamber
providing a passage for ‘gasoline and: equipped
singlesmallopenihg in theupper surraoe
duitiand'no'more liquidi‘will scene
A deviceforthe prevention of vapor lock in
gasoline lines comprising, a horizontal conduit
t a c1osed cylindrical casing extending
id conduit and sealed thereto with the
conduit extending through the ‘side wall of the
casingta'nd with the. openihgin the conduit being
disposed. hithe central portion of the casing,
whereby atleast half of the internalivolume of
the liquidin'qthe
the ibod‘y" passage
the charities‘ 39
the. chamberprovided by the casing is disposed
reaches the level oft‘hé‘opening 2'8, at‘least, when "
the volume -' of the chamber‘ ‘30 _-below"th:e opening
28 =is'at' least-“equal to that‘ abovelthe opening, “
3. A device for the prevention of vapor lockin
gasolinevli-nes comprising, a, horizontal conduit
providing a passage for gasoline and'equipped
witha single small opening in the upper surface
thereo?i a’ casing extending about said conduit
The liquid gasoline flowing through'thej‘pas
sag'e'i29 may contain ‘inntunerableininute bubbles
of gasoline vap'orL' When these“bubbles‘of’.vappr
pass through the‘opening zsthey are" moved up
wardly through the'opening‘into'thechamber 3B
below the opening.
and sealed thereto providing a closed chamber
and are thus removed'froni the ‘stream of_,liduid
containing air, said chamber being in communi
cation with said opening and extending upwardly
alfld‘gdownwardly therefrom, the opening in said
gasoline‘: 'By‘ ‘reason ‘of the 'welliknown' phenom
ena of partial pressure; the so in the chamber
30 serves to‘prevent the ‘further flow‘ofv liquid
volume ofatheich/amber whereby the air pressure
in‘the lchamberfserves to prevent sufficient liquid
conduit being . disposed in the upper half by
dition- is e'stablishedfbut'does notprevent the
gasoline from ?owing from the opening-in the‘.
conduit, to reach: a. liquid :level ‘in ‘the chamber‘
flow of gasoline vapor from the opening‘ 28. Ace
abyove'ztheopening in the conduit.
through the opening 28 once‘ the equilibrium con;
cordingly; the bubblesor pockets of gasoline vapor
in the liquid stream are'rea'dily removed't'o the
chamber 30.’
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