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Патент USA US2597234

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May 20, 1952
' 2,597,231
Filed April 19, 1950
3 Sheets-Sheet 2
F re. 2.
—_ ::::1??"I1
May 20, 1952
s Sheets-Sheet 5
Filed April 19,1950
F l G. 4 .
Patented May 20, 1952
James L. Edelen, Kirkwood, Mo., assignor to
Carter Carburetor Corporation, St‘. Louis, Mo.,
a" corporation of Delaware
‘ Application April'1‘9, 1950,. Serial No. 156.9l2
5 Claims. (01.73.4121)
This invention relates to flow meters for ac- I '
curately'measuring the quantities of fuel and/or
air which will pass through a carburetor under
de?nite‘ pressure and throttle conditions and,
thereby, comparing the carburetor being tested
with a standard or “OK” sample carburetor.
Carburetors have been flow tested in produc
tion quantities by providing a series of stands to
which a number of carburetors may be attached,
simultaneously, for testing by the crew of opera
tors on duty. A ?ow meter, connected in the fuel
supply to each test stand, determines the rate of
fuel delivery" (consumption) corresponding‘ to- the
rate‘ of mixture delivery, as measured by the dif
ferent‘lal pressure which exists on opposite sides
of a restriction in the induction conduit connected
to the stand. In a large ?ow test room, all or a
considerable number of the stands may be con~
nected‘ to a- single suction pump through a suit
able header‘ in which there may be provided‘ a 20
The apparatus in Fig. 1 includes a plurality of
test stands, each‘represented by a shelf ||l> through
which opens a pair of branch suction conduits
H and I2, the former being substantially larger
than the latter. These conduits have ‘bolting
?anges I3 and I4 at their upper extremities for
attachment of a carburetor to be tested, as by
the means covered in an application, Serial No.
159,690, ?led May 3, 1950, in the name of Adolph
J. Rubin. Branch induction conduits H and I2
are arranged in pairs, as shown, and lead to a
header I5 which is connected by a pipe IE to main
suction pump l'l. Within pipe l6 there is pro
vided a butter?y valve I8 connectedby a lever B
and link 20 to device 2| connected by passage 22
to the header. Device 2| functions in response
to the pressure in header I5 to actuate valve i8
so as to tend to maintain this pressure substan~
tially uniform. Each stand also includes a panel
23 having windows 24 and 25 for inspection-of
fuel ?ow and pressure registering meters asso
pressure responsive device tending to maintain
ciated, respectively, with induction pipes H and
uniform pressure within the header. However,
a time element" is required for readjustment of
As best'shown in Fig.2, each branch passage II
theiheader pressure-each time the demand in the
(or |2)" is provided with an ori?ce forming re
test stands changes due to application or removal
striction 29 on the opposite sides of which are
of test-carburetors. Since the ?ow test operators
?ttings 30 and 3| for connecting tubes 32 and '33
work- rapidly, it frequently occurs that readings
to the branch conduit. Flow guiding vanes 34 are
are taken before there has been time for the
interposed between the restriction and the mount—
header pressure to again reach normal. These
improper readings may result in the passing or 30 ing ?ange. Each of the larger branch conduits
H is provided with an enlarged chambered por
scrapping of the test carburetor which may not
tion 35 into which the upper portion of conduit I |
be justi?ed .
extends, as at 36, so as to shield the upper portion
The main object of the present invention is to
of the-chamber from the- effects of the direct'air
provide ?ow test apparatus in, which the suction
condition at each test stand will remain constant , ?ow‘ through the conduit. ' A butter?y throttling
at all times, irrespective of whether or not an; ; valve 31 is provided in each conduit below or
adjacent test stand may be in operation, and
without unduly multiplying the number of com
plete test mechanisms, including suction pumps.
The invention consists in providing in the branch 40
conduit for each test stand, an individual pres
sure maintainingv instrumentality which coop
erates with the constant rressure device ‘provided
in the‘ header to attain this object.
posterior to chamber. 35 and connected by a lever
38 and link 39 to the piston. 40 of a differential
pressure motor 4|. This motor is controlled by a
pressure sensitive control device 42, best shown in
Figs. 3 and 4, to which compressed air is supplied
through a tube 43 for operating motor 4|, and
which communicates by means of a passage 44
with the shielded portion of chamber 35. Suction
motor 4| and pressure controlv 42 may be identical
In the accompanyingv drawings whichillustrate 45
with corresponding parts designated 2| in Fig. 1.
the invention,
Each smaller .branch conduit l2 includes a
Fig. l is a view, largely diagrammatic, repre
restriction forming ori?ce, corresponding to ori?ce
senting a ?ow measuring system including a plu
29 in Fig. 2, and connections on oppositev sides
rality of test stands.
Fig. 2 shows in greater detail some of the parts 50 thereof for tubes 45 and 46. However, auxiliary
throttling valve ‘31 and its control mechanism,
which apply to a single test stand.
Fig. 3 is an enlarged detailsection showing a I
part of the-pressure controlling -_instrumental_it_y
applied to the individual test stand.
including motor 4|, control 42, and chamber35
are omitted from the smaller conduits. Tubes
32 and 33 and .45 and 46 lead to manometer-s,
to manometer 48 and located behind win
Fig. 4- is a detail section taken on line 4-4 of 55
dows 24, for measuring the di?erenti'al pressure
which exists at any given time on the opposite
sides of the ori?ce 29 in the corresponding branch
conduit. In connection with each test stand there
are also provided a pair of liquid fuel flow meters,
as 49, located behind windows 25 and connected
by tubing 50 to a suitable source of liquid fuel
maintained at substantially constant pressure and
by tubing 5| to the carburetor 52 being tested.
A ?ow meter is provided for each suction conduit
H and I2.
In the testing procedure, a carburetor is ?rst
applied to one of the smaller branch conduits I2
84 leading to the opposite ends of differential
fluid pressure motor 4|. Compressed air is led to
the valve structure by tube 43 through removable
screen 85, thence to chamber 86 which communi
cates through ports 81 and 88 with small cham
bers 89 and 90 at the ends of valve seat plugs 14
and within casing caps 12. The ?uid'pressure
then ?ows around angular section pin 10 and in
the ori?ce 13 which is open at the moment
10 through ports 80, fitting Bl or 82, and tube 83
or 84 to one side of motor 4|, causing actuation
of the same and shifting of throttling valve 31.
with its throttle 53 in idling position and readings
Ball valves 69 act alternately so that when they
taken on the appropriate flow meter 49 and ma
are in their leftwardmost positions, as in Figs.
nometer 48. The carburetor is then shifted to 15 3 and 4, fluid pressure may enter right hand tube
one of the larger branch conduits II and tested
83. At the same time, the pressure in the oppo
in one or more open throttle positions. In each
site side of the fluid motor may exhaust through
test, the operator is provided with standardread
the other tube 84, through ports 80 in the cor
ings of the manometer and fuel flow meter and
responding seat member 68, thence through cen
with limit ranges which must be exhibited during 20 tral ori?ce 15 in the seat member into central
the test. A carburetor is scraped or further in
chamber 92 and to atmosphere through ports
spected and repaired if, under a given differential
pressure condition, at restriction 29, as read on
This mechanism provides an extremely sensi
the manometer 43, the fuel flow reading does not
tive and prompt adjustment of throttling valve
fall within a given range. However, this test 25 37 to compensate for any changing of pressure
procedure assumes a uniform pressure on the
posterior side of restriction 29, that is, in the case
within chamber 35.
The pressure on the under
side of restriction 29, in larger conduit ll, being
doubly safeguarded by pressure control means
of larger branch conduits ll, within chamber
35. Such uniformity is especially important in
l8 and 2! in the header and the auxiliary pres
measuring the open throttle flows and Figs. 2, 3, 30 sure control instrumentality 31, 41, 42, etc., just
and 4 show in detail the instrumentality utilized
described, in each branch suction conduit, will
for insuring such pressure uniformity.
remain accurately constant at all times. There
Control device 62 does not, in itself, constitute
fore, the readings obtained on corresponding
the present invention, but is shown somewhat in
manometer t8 and flow meter 49 will accurately
detail in Figs. 3 and 4 for better understanding. 35 indicate the conditions of fuel and air ?ow and
This control comprises an elongated housing 55
re?ect the condition of the carburetor being
within which is a diaphragm 55 which is exposed
tested. Moreover, this accuracy will not be seri~
on its left side to the shielded portion of chamber
ously affected by changes in the conditions to
35 through passage 44. The diaphragm is con
stantly urged to the right by a coiled spring 51
and is connected by a stem 58 to a tapped mem
ber 59v having an eye 66 and a pair of parallel
annular ribs 6i. A tension spring 62, connected
which the other ?ow stands are subjected, a con
dition which would be true to a much lesser de
gree and only when a time interval has passed
after a change in any one of the ?ow stands, if
the secondary pressure maintaining instrumen
into eye 6t applies a pressure to the diaphragm in
tality shown in Figs. 2, 3, and 4 were omitted.
the same sense as compression spring 51. A
The invention, accordingly, insures accurate
small, spherical projection 63 on a tilting member
and very rapid testing of carburetors and for this
534 is received between ribs 5| on member 59.
reason, is readily adaptable to high production
Housing 55 has a bottom opening 65 accommodat
operation where it will considerably improve the
ing tilting member 64 and sealed by a diaphragm
quality of carburetors prepared for shipment by
50 the factory. Of course, the number of flow stands
A second, hollow casing structure 6'! is secured
attached to the header may be multiplied in
about this opening and clamps the diaphragm in
accordance with the capacity of the suction pump
position. The second casing has aligned, later
and the test load.
ally projecting hollow parts 510: each receiving a
‘cup-like valve seat 63 and a ball valve 69 nor
mally held on its seat by a pin 19 of angular sec
Various features, such as the particular types
55 of flow measuring instruments and the number
of test stands applied to a single suction pump
tion urged inwardly by a compression spring ‘H
and header may be modi?ed, and the exclusive use
seating against a removable housing cap 12.
of all modi?cations as come within the scope of
Each pin '56 is received in the central ori?ce 13 of
the appended claims is contemplated.
‘a plug 74 screwed into the open end of the valve
I claim:
seat cup. The seat cup and plug form a cage
1. Apparatus for flow testing carburetors com
for ‘the ball valve with opposite seats at the ends
prising test mountings for a plurality of carbu
of ori?ces l3 and '15, the latter being in the end
retors, a suction pump, air conduits connecting
of the cup member. The valve may be unseated
said mountings and said pump, meters for meas
by a lateral ?nger l6 projecting from an aper
uring fuel and air passing through carburetors
tured element ‘ll’ which receives the spherical
on said‘ mountings, a throttling valve in each of
lower extremity ‘E8 on depending portion 19 of
said conduits, and a pressure sensitive device com
tilting member as.
municating with each of said conduits between
The valve seat and ball valve elements on
the valve therein and the test mounting therefor
each side of depending casing portion 6'! are iden 70 and connected to the corresponding valve for
tical. Each valve actuating pin 76 extends
shifting the same responsive to pressure varia
‘through central ori?ce 75 in the seat member
tions in said conduit to maintain substantially
andthe seat member also has radial ports 88
constant pressure in said conduit.
which communicate with one of the tube ?ttings
2. Apparatus for flow testing carburetors com
8!, 82., The ?ttings accommodate tubes 83 and 75 prising a plurality of stands for mounting carbu
retors to be tested, a suction pump, a suction
conduit leading from said pump including a
header and branch conduits, each connected to
one of said stands, a restriction in each of said
branch conduits and a flow meter connected
thereto on opposite sides of the restriction there
sizes for testing carburetors, respectively, for
idling and open throttle operation.
4. Apparatus as described in claim 2 further
including a source of liquid fuel supply and a
fuel flow meter for each branch conduit.
5. Apparatus as described in claim 2 including
branch conduits of relatively small and larger
sizes for testing carburetors, respectively, for
tween said pump and said header and a device ,
idling and open throttle operation, each larger
responsive to pressure in said header and con
nected to said valve so as to tend to maintain 10 branch conduit having ba?iing in the zone with
which said pressure responsive instrumentality
substantially uniform pressure in said header,
in for measuring flow therethrough, a valve be
and pressure adjusting means for the zone in
communicates to shield said zone from the direct
?ow therethrough.
each branch conduit immediately posterior to the
restriction therein comprising a throttling valve
posterior to said zone in the branch conduit, and
an instrumentality responsive to pressure condi
The following references are of record in the
tions in said zone and operatively connected to
?le of this patent:
said throttling valve for actuating the same to
maintain constant pressure in said zone whereby
said flow meter accurately re?ects pressure con
ditions of the flow delivered by the carburetor
being tested.
3. Apparatus as described in claim 2 including
branch ‘conduits of‘ relatively small and larger
Fiock et al. ______ __ Aug. 25, 1942
Crosby et a1 _______ __ Jan. 21, 194'?
Eclelen ___________ __ Jan. 1'7, 1950
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