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Патент USA US2116592

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May 10, 1938.
2,1 16,592
Filed Dec. 17, 1937
_ W s. W
Patented May 10, 1938
Robert S. Bassett, Buffalo, N. Y.
Application December 1'7, 1937, Serial No. 180,380
2‘ Claims.
(Cl. 73-198)
My invention relates to a device, for metering
liquids which are flowing at ‘such a low rate that
they connot be ordinarily metered by simple and
inexpensive mechanical means, such as the dis
placement ty pe liquid meters which are now com.
mercially available. Among the best of such me
ters is the familiar nutating disc type liquid me
ter which, if carefully constructed, will accurate
ly measure flows of liquids such ‘as fuel oil, at
10 ?ows having a rate as low as three gallons per
hour or as high as twenty gallons per minute.
‘The object of my invention particularly is to.
measure ?ows of liquid which must be discharged
from the me asuring
device slowly and uniformly
15 at flow rates which will ordinarily be between
one-half and two and one-half gallons per hour.
‘ Such flows do not develop enough power to con
tinuously overcome the running friction of. dis-
placement type liquid meters. Thisfriction loss
20 however, can be minimized if only operative dur-
ing a part of the flow cycle. A particular ap~
plication of my device is to the measurement of
fuel oil consumed by small oil burners used espe
cially for house heating purposes. The supply
oil to the oil burner when burning must be
steady and constant and, is usnallyat a flow of
approximately two gallons per hour. My device
is especially suited for the metering of such slow
?owing liqui(1, but its maximum capacity is sub
30 ‘ stantially that of the liquid meter which is used
as a part, of the device, as shown in the illustra
is shown as the familiar displacement type nutat
ing disc liquid meter. 5 is the accumulator cham
ber with inlet 6, outlet ‘I and vent opening 8. 9
is piping means leading from accumulator charn- .
ber 5 to the top of supply container I. Illisa
source of compressed air of any conventional
type, one of which is ‘shown on the illustration.
H is piping means to convey the compressed air
from its source ID to the top of supply container
I, so that, when arranged as shown in my draw- 10
ing, supply container I and accumulator cham
ber .5 are both under air pressure, which would
speed up when desired the flow of the oil out
through outlet 1’. I2 is the ?lling opening, for
supply container I and is shown of the capped- 15
over type, to prevent the escape of the compressed
air within supply container I. I3 is a fuel oil
burner of the usual type, installed so as to- heat
a furnace I4, which is shown of the house heat
. ing‘type. I5 is ashut-ofi valve on the outlet 20
line from accumulator chamber 5.
IT, I8, I9, 20
and 21‘ are piping means, connecting the previ
ously mentioned units as indicated in the draw
Accumulator chamber 5, as shown in Figure 1, 25
has in its inlet Iia‘valve 22 and also comprises
?oat 23, ‘which is‘voperatively connected to valve
22 by‘ snap action toggle mechanism 24, which is
shown of. a conventional type. Accumulator
chamber 5 has its interior space divided into two 30
parts. Float compartment wall 25 encloses float
23'to form'a float compartment, while outer wall
tions and the description.
Another object of my invention is to prevent 28 together with?oat compartment wall 25 form
the escape of explosive fumes from tanks and‘ an outer storage ‘compartment between them.
35 ‘* chambers containing the oil. , In my construction
I show the use of air under pressure, which is
advantagecus to force thick oil through restrict
ed piping where gravity ?ow might be at too slow
a rate.
To illustrate more clearly the application of
my invention I shall describe its particular use
in connection with small oil burners.
Figure l is a vertical sectional view through the
accumulator chamber and shows the location of
45 the openings and the interior mechanism.
Figure 2 is an exterior side view of my device,
as installed with a typical house heating furnace
?tted with a fuel oil burner.
Accumulator chamber base 21 closes off the lower 35 “
end of the chamber to complete the enclosure of .
the ?oat‘ chamber compartment and the storage
chamber compartment.
28, 29, 3B and 3| are
openings in ?oat compartment wall 25, to allow
the ?ow of liquid into the storage compartment. 40
This segregation of the ?oatin a separate float
compartment eliminates wear on the ?oat and its
connecting mechanism, because surges of the
liquid. and vibration aifecting the liquid in the
storage compartment are not transmitted to the 45
float, thereby eliminating valve chatter and con
sequent wear. .As my measuring device is suit
able for installation on moving bodies such as
Referring to the drawing in detail, I is a tank boats and automobiles‘, this protection and stabil
ization of the ‘liquid surrounding the ?oat is a 50
as the oil supply container. Z‘is a shut
valuable feature and one not hitherto available
off valve on the discharge line from supply con
tainer l. 3 is a trap strainer of the usual type < in accumulator chambers of this exact'type,
‘Valve 22, as shown in‘the ‘drawing, is wide open
which is required on such installations to remove
‘float 2,3 is at its lower position with the
impurities fr
level of the liquid within the‘ chamber at a low 55-»
“ apparatus. 4 is any suitable liquid meter and
I 2
point. When the liquid level within the cham
ber reaches a higher point as the chamber ?lls
with liquid, ?oat 23 moves upward and through
toggle mechanism 24 ?nally closes valve 22. A
snap action ?oat control valve can be constructed
in many ways, and I am not limiting the mech
anism of the construction to the exact construc
tion shown in the drawing which is only one of
a number of different types which can be used.
10 The essential feature of the snap action is that
the Valve is suddenly opened wide, when the ?oat
reaches its lowest point of travel, andv is simi
larly suddenly closed, when the ?oat reaches its
uppermost point of travel.
Outlet 1 from accumulator chamber 5 is shown
leading from the storage compartment between
wall 25 and wall 26, as is also the case of vent
opening 8, which normally allows the passage of
air to and from chamber 5. It should be noted
20 that piping means 9, which is attached to vent
8, does not lead directly out of the ?oat compart
ment enclosed within ?oat compartment wall 25.
The pressure within the ?oat compartment ?uc
tuates up and down slightly, as the ?uids ?ow
25 in and out of openings 28, 29, 30 and 3!, so that
for a considerable part of the flow cycle there
is a slight difference in the pressure within the
?oat chamber compartment and the storage com
partment portions of accumulator chamber 5.
30 vVent opening 8 from the storage compartment
is not a direct vent from the segregated ?oat
compartment, for reasons as explained above. In
my invention, I have shown a novel construction
for the accumulator chamber by providing an
35 inner ?oat compartment and an outer storage
Float compartment wall 25 also
has in it an opening 32 which serves as a guide
means for ?oat stem 33, a distinctive feature of
my construction, which allows wall 25 to serve a
40 duel purpose.
I have described in detail the action within
accumulator chamber 5, which is used as an
accumulator with a meter to act in a general way
as covered in earlier patents showing the accumu
45 lator principle.
This action, while well under
stood, consists essentially of the oil in accumu
lator chamber 5 running slowly to burner l3, as
required for combustion. When there is only a'
small quantity of oil left within chamber 5, ?oat
50 23 opens valve 22, allowing a sudden inrush of
oil from supply container I through meter 4.
This ?ow of oil to ?ll chamber 5 is at a rate far
in excess of that of the ?ow to the burner itself.
Under ordinary installation conditions with the
55 bottom of container I elevated a couple of feet
above chamber 5, this flow is around 60 gallons
per hour, which is more than ample to operate
meter 4 at a speed at which it will measure very
In passing one gallon of oil through the system,
the meter is operated for approximately one
minute only, while it will take approximately 30
minutes for this one gallon of oil to be used by
the oil burner. In this way the friction of the
65 meter must be overcome during only one-thir
tieth of. the time that the burner requires to use
the oil, so that the power available to operate
the meter is thirty times that which it would be
if the energy from the downward movement of
the oil were distributed uniformly over the entire
period of ?ow to the burner.
The essential elements of a measuring device
with an accumulator are a storage reservoir on
the outlet line from the meter between the meter
and liquid consuming means, a quick acting valve
controlling an intermittent ?ow to the reservoir
and located between the reservoir and the meter,
together with means to open said valve suddenly,
when the supply of said liquid within said reser
voir approaches its minimum, and to close said
Valve suddenly when the supply of liquid within
said reservoir approaches. its maximum.
My invention, however, does not cover the basic
principle of the‘ accumulator and meter com
bination, but covers improvements in the accumu 10
lator to perfect its action. I have also shown the
use of a piping means connecting chamber 5 with
container I, so that these two at their uppermost
points are always under the same air pressure,
irrespective of. the absolute value of said air pres 15
sure, which as shown in my drawing is consider
ably above atmospheric, so as to facilitate the
?ow of the oil from chamber 5 to burner l3.
My invention is novel in respect to the provi
sion for air pressure on the entire system, as 20
hitherto accumulator chambers were frequently
inoperative unless the explosive gases within the
chamber were vented freely from the float com
partment direct to the surrounding atmosphere.
In my invention I have shown how it is possible 25
to con?ne these fumes entirely throughout the
?ow cycle.
While in some installations the oil would ?ow
from outlet ‘I to fuel oil burner I3 by gravity,
nevertheless in many installations, such as the 30
one shown in my drawing, there is very little, if
any, drop from the bottom of supply container l
to burner l3. As I have stated above, the bottom
of container I should be a couple of. feet higher
than chamber 5, so that the ?ow from container 35
I through meter 4 will be at a su?iciently high
rate to operate the meter at a speed at which it
will measure accurately.
There must be a rea
sonable liquid head to make this ?ow high enough.
With accumulator chambers having a direct at 40
mospheric vent from the ?oat compartment, the
flow from the chamber to the fuel oil burner must
be by gravity, so that with previously used mecha
nisms it is necessary to have the accumulator
chamber mounted higher than the burner. As
it is also necessary to mount the accumulator
chamber below the supply container, it is self
evident that with previously used accumulator
chambers there must be a drop of at least a couple
of feet from supply container to the burner. In
my invention, I have provided for a combination 50
which will measure the oil satisfactorily even
though there is only a few inches drop from the
supply container to the burner, as I provide for
mounting the accumulator chamber at a rela
tively low level, a construction not heretofore 55
The use of air pressure in the accumu
lator chamber makes it possible to
sui?cient difference in elevation
chamber and the supply container,
tally necessary requirement of
metering systems.
provide for a
between the
a fundamen 60
Similarly, as stated above,
this air pressure is also highly desirable when the
?ow of oil to the burner must be speeded up, even
though it might flow to some extent by gravity or 65
other means in this line.
Having thus described my invention what I
claim for Letters Patent is:
l. The combination with a liquid fuel metering
apparatus comprising a supply tank, fuel direct 70
ing means including a conduit for conveying the
fuel from said tank to a point of use, and a ?ow
meter interposed in the conduit for measuring
and indicating the quantity of. fuel conveyed
therethrough; of a chamber interposed in said 75
conduit between the meter and the point of use,
and having a fuel outlet port, a fuel inlet port,
a valve controlling the entrance of fuel into said
chamber through said inlet port, a ?oat in said
chamber, means for causing said valve to be
moved to closed and open positions by said ?oat
only‘when said ?oat is moved through a rela
tively wide range of movement, and an air vent
from said chamber; an opening for ?lling said
10 supply tank with liquid fuel; a cover for said
opening to prevent the escape of air from said
and indicating the quantity of fuel conveyed
therethrough; of a chamber interposed in said
conduit below said tank and between the meter
and the point of, use, and having a fuel outlet
port, a fuel inlet port, a valve controlling the
entrance of fuel into said chamber through said
inlet port, a float in said chamber for controlling
said valve, toggle mechanism connecting said
?oat operatively with said valve to snap said
valve to closed or open position only at two pre 10
determined positions of said ?oat Within said
chamber, and an air vent from said chamber; an
tank; a source of. compressed air; a conduit for
conveying compressed air from said source to said
opening for ?lling said supply tank with‘ liquid
tank; and a conduit connecting said supply tank
fuel; a cover for said opening to prevent the
escape of air from said tank; a source of com 15
15 near its uppermost point to said air vent from
said chamber, for conveying compressed air be
tween said tank and said chamber; substantially
pressed air; a conduit for conveying compressed
as and for the purpose described.
connecting said supply tank near its uppermost
point to said air vent from said chamber, for
conveying compressed air between said tank and 20
said chamber; substantially as and for the pur
2. The combination with a liquid fuel metering
apparatus comprising a supply tank, fuel direct
ing means including a conduit for conveying the
fuel from said tank to a point of use, and a ?ow
meter interposed in the conduit for measuring
air from said source to said tank; and a conduit
pose described.
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