close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2407139

код для вставки
Sept“. 39 1946-‘
w. c_. CLOTHIER ETAL
2,407,139
SYSTEM FOR PRODUCING REGULATED LIQUID PRESSURE I
Filed Feb. 14, 1944
‘
-5 Sheets-Sheet l
F/GL4.
* gm wan},
Inventors
BWMM '
Attorney
. '
isqlt 3, 1946I
w. c. CLOTHIER ETAL
‘
2,407,139
SYSTEM FOR PRODUCING REGULATED LIQUID PRESSURE
Filed Feb. 14, 1944'
‘
3 Sheets-Sheet 2
gkmwmrm.
WWW
In ventor:
YBWMM
.
Attornfey
.3, 1946 -
'
>
2,407,139
w. C. CLOTHIER _ET'AL
SYSTEM FOR PRODUCING REGULATED LIQUID PRESSURE
1 Filed Feb.‘ 14, 1944
5 Shéets-Sheét 5
"
' Mam“
Mu.
' I noentor:
lay/$4 Attorney
Mu Lira.
Patented Sept. 3, 1946
2,401,139
UNITED ‘STATES. PATENT OFFICE,
_ i I SYSTEM ronrnonuomo REGULATED
-
i
.
-
LIQUID PRESSURE
,
,William Charles Clothier, Beatrice Na‘ylor, and
’
.John ‘Ernest Patrick Dunning, Farnborough,
Hants, England, assignors to the Minister of
Supply iniHis Majesty’s Government of the
United ‘Kingdom of Great Britain and Northern
Ireland, London, England '
‘Application February 14, 1944, ‘Serial No. 522,352
‘
In‘Great Britain July 7, 1941
9 Claims. (Ci. 1o3,_11)
The invention relates to a fluid supply i‘egu-p
lating system including an adjustable ?uid pres
sure actuated ?ow regulating valve and a‘variable‘
speed centrifugal pump for producing liquid pres
sure to actuate said valve.
‘
2
schematic views of alternative systems in accord
ance with the invention, and Fig. 4 is a sectional
view of ‘ one form of variable radius centrifugal
pump.
‘
,
Referring to Fig. 1, l0 isa duct for supplying
i p ‘
pump in normal operation that when the‘ liquid
fuel to an internal combustion engine‘ the fuel
being supplied under pressure by a pump l | , and
being pumped passes from an inlet near the axis
passing through a metering‘ ori?ce [2, whose
--It‘ is a property inherent in any centrifugal
effective area is adjustable by a valve member l3,
gas dissolved in the liquid tends to separate in 10 ‘and through a second ori?ce M on the down
of the pump to an outlet near the periphery, any
the pump and to collect near the axis where the
j‘stream side thereof, the effective area of ori?ce
pressure is lowest, and is discharged ‘from the‘
l4, also being variable by a valve member I5._
An engine-driven centrifugal pump 16, which
pump in ' “gulps.”
If, therefore, a centrifugal
always generates a pressure lower than that of
pump having the normal direction of circulation
of liquid is employed to generate pressure for 15 ‘the ?rst or main pump ‘H’, is connected“ to the
duct‘ l0 inparallel with the pump 1 I,‘ so that“
actuating a valve,‘ the periodic collection and dis
liquid from the downstreami‘or high pressure side
charge of gas in and‘ from the centrifugal pump
of pump H ‘passes through pipe ll‘and enters
disturbs the operation of the valve. A centrifugal
pump has, however, the advantage that the pres- ‘
pump‘ l6 ator near itsperiphery, and??ows‘
sure difference across ‘the pump varies as the 20 through‘ the‘ pump l6 towards its axis, leaving
near the axis of the pump’ i8 through pipe l8
square of its speed, and hence the adjustment of
which returns it to duct I0 on the upstream side'
the flow regulating valve varies in a known rela
of pump I l . To control ‘to a low value the flow of“
tionship with the speed at which the pump is
driven.
An object of the invention is to produce a ?uid
supply regulating‘ system in which a variable
speed centrifugal pump is employed to actuate‘an
adjustable ?ow regulating valve but in which the
disadvantage mentioned above ‘is obviated or
minimized.
‘
lithe pipe I8 is con
1 liquid _ through the pump
stricted as shown at 20.
'
‘
g
‘
‘
‘
YA tapping in the pump l6,‘ nearer the axis
thereof ‘than the tapping connected to pipe I1 but
notso near to the pump axis as the tapping‘ con
nected to ‘pipe l8, supplies liquid from pump it
through pipe 21 to one side of a ?exible ‘dia
‘
phrag‘m'22 carrying the valve ‘15, and the other
It is a further‘ object ofthe invention “to pro;
duce a fuel supply system for an internal combus
tion engine embodying an engine driven centrifu- ‘
gal pump‘ for actuating ‘a flow regulating valve
whereby said valve is maintained adjusted in ac
cordance with a function of the'engine speed,
while the inherent disadvantages‘of a centrifugal‘
side ‘of which is e‘xposed'to the pressure of the‘
liquid‘between the apertures l2 and I4.
‘
‘When the system‘is running, if P represents
‘the ?uid pressure ‘in‘lthe‘ pipes in and i1, N‘the’
rate'of rotation‘ ‘of the ‘centrifugal pump l6, R,
R" and R” the effective radii‘fat which the pipes
l8, VH and I‘! are ‘respectively connected to the
centrifugal pump |6,fa‘nd' K a constant: 7
These objects areattained by reversing the flow
through the centrifugal pump so that liquid is 40
forced through the pump towards the axis there
pump in such a system are minimized or ‘obviated.
of. In‘ this way‘ the centrifugal pump still generi
ates a pressure difference (which is shown as ‘a
pressure drop across the centrifugal pump) which‘
l in),
varies as the square of the speed at ‘which it is
represents ‘the pressufe at
driven, ‘but any'gas separating in the centrifugal
pump, instead of collecting and gradually ?lling
the casing, is continuously removed from the
Thus irrespective“ of ,the, instantaheougv value’; v
of .‘P, the pressures at 2! and Bare lessvl'than P f
liquid outlet near the axis of the pump‘with the
liquid passing through said outlet.
_
_
‘
‘
Additionalobjects and advantages of the in
vention will become apparent ‘train the following
more detailed description ‘of systems embodying
the same, read in conjunction ‘with the accom
panying drawings, in which Figs. 1-3 are three
,
,
.
(pressure at IT) by anamount which is directly‘
dependent on the square of the rotational’jspeed'_
of the ‘centrifugal purnp?l? and variation in the ‘
value of P does not ‘cause, variation in‘the above
mentioned “pressure difference.
’
It ‘must be‘understood that the mechanical ‘tie-{j
sign is such that within the attainable rotational
magerbr the‘centrifug'al pump‘l? the press
55 9 speed
.
2,407,139
3
4
sure difference generated thereby must always be
less than the pressure difference generated by the
stitute for example an engine speed governing
system in which the valve 31 is a throttle located
in the induction pipe of the engine, pump I I then
being either a fuel pump or an oil pump, the
pump Iiso that the expressions. (I) and (II)
above always represent positive values.v
'
Accordingly, with the system running, if the
throttle 31 consequently being moved in response
to changes in pressure generated by the engine
speed of pump I6 is increased, the pressure diner
ence which it generates will increase, hence it
driven centrifugal pump, and hence in response
' to changes in engine speed with variations in the
7‘load or other operating conditions.
will pass less liquid and the pressures in ‘pipes ‘
I8 and BI will decrease. The diaphragm 22 and
valve It will consequently move to increase the
effective area of ori?ce I4, and hence to cause a
In the systems shown in any of Figs. 1-3, a
centrifugal pump with a variable effective radius
reduction of pressure on the upstream or high
.may be substituted for the pump I6, one form
pressure side thereof, hence increasing the pres
of such pump being shown in Fig. 4, in which
sure difference at the two sides ofthe metering,r
the pump casing 50 is drilled near the pump axis
ori?ce 52. Since the pressure difference across 15 to'provide a ?xed low pressure connection 5|,
the metering ori?ce I2 is a function of the square ‘. the high pressure connection 52 for the pump
of the speed at which the engine-driven centrif- _ _ communicating with the pump through an eccen
ugal pump I5 is driven the ?ow through said '
tric passage 53 drilled through a pivoted plate
ori?ce will be a function of the engine speed, and
‘ 54 which=may be rotated to Vary the effective
by connecting the valve I 3 through a rack and 20 radial distance between the low pressure connec
pinion or other mechanism to other actuating
tion 5| which is v?xed and the passage 53 which
means the effective area of said ori?ce may be
is movable, by means of a. handwheel 55 pre
made dependent on one or more other factors, so
vented from accidental movement by a spring
that the fluid supply to the engine may be made
loaded ball 56. In an alternative form (not
to vary as a function of the engine speed and 25 shown) two or more ?xed high or low pressure
other factors. Further means for adjustment
connections may be arranged at different radial
may be provided by interposing- a manually or
distances from the pump axis, a selector valve
autos etically-controllable two speed, or mu1ti~
being employed to enable the desired connection
speed, or continuously variable speed gear in the
to be selected.
drive for the centrifugal pump, or by substituting 30
We claim:
>
for the pump I6 a variable radius pump as shown
in
4.
The system shown in Fig. 2 differs from that
shown in Fig. 1, in that there is embodied in the
pump II a by-pass controllad by a spring loaded
v 1. A system for regulating an adjustable ?ow
control valve comprising a duct for supplying
liquid under pressure, means for producing a
pressure difference between two parts of the duct.
. q a driven centrifugal pump for producing a pres
valve Ill, whereby the- pressure generated by
sure difference less than the pressure difference
the pump I I is limited to a predetermined maxi~
mum. The pressure responsive element actuated
by the centrifugal pump I6 is shown as a flexi
ble bellows I22 instead of the diaphragm 22 in 40
between the two parts of the duct, said centrifu
gal pump having an intake near its periphery
connected to the high pressure part of the duct
and an outlet nearer its eye connected to the low
Fig. 1, and it will be observed that the bellows
I22 is subjected to the pressure in the pipe I8
pressure part of the duct, so that the liquid passes
through the centrifugal pump in a direction op
instead of to the pressure at a separate tapping
posed to the pressure gradient therein, and means
as in Fig. 1.
,
responsive to pressure changes in said pump for
In the form shown in Fig. 3, a'pump I! again 45 actuating the valve to be regulated.
passes liquid along a duct I 0 and is connected
2. A system for producing regulated liquid pres
in parallel with an engine drive centrifugal pump
sure comprising a duct for supplying liquid un
I6 to whose periphery ?uid is passed through pipe
I‘! leaving the eye of the pump through the pipe
I8. A ?exible bellows I22 hasits outside exposed
to the pressure of the liquid in the pipe I8. while
difference between two parts of the duct, a driven
centrifugal pump for producing a pressure dif
ference less than the pressure difference between
the pressure of another fluid in a duct 40 acts
inside the bellows I22. Movement of the bellows
the two parts of the duct, said centrifugal pump
having an intake near its periphery connected to
I22 controls the position of a servo control valve
3I in a housing 32 having ports which communi
der pressure, means for producing a pressure
the high pressure part of the duct and an outlet
55 nearer its eye connected to the low pressure part
cate with a passage 30 connected to a high pres
sure point in the duct I0, and with a low pres
of the duct, so that the liquid passes through the
centrifugal pump in a direction opposed to the
sure point through the pipe I8. Further ports
pressure gradient therein, and means responsive
are provided in the housing 32 communicating
to pressure changes in said pump for regulating
respectively with pipes 33, 34 which open at op 60 the flow of liquid in said duct.
posite sides of a chamber 35 divided by a pivoted
3. A system for producing regulated liquid
vane 35 actuating an' adjustable valve 31 in the
pressure comprising a duct containing lfquid, a
duct 49. Thus a change in the pressure in the
supply pump for passing liquid along said duct
liquid surrounding the bellows I22 will cause the
and for creating a pressure difference therein,
bellows I 22 and valve 3| to move thus passing 65 a centrifugal regulating pump for generating a
high pressure liquid from pipe 30 to enter either
pressure difference smaller than the pressure dif
' 33 or 34, and allowing the other’ of said pipes
to exhaust through pipe I8, whereby the vane 38
ference created by the supply pump and having
an-inlet near'its periphery connected to the high
and throttle 31 are moved to a new position. The
pressure side of said supply pump and an out
system shown in Fig. 3 maybe used for exam-. 70 let nearer its eye connected to the low pressure
ple when the duct 40 contains liquid fuel whose
side of'said supply pump, and means responsive
supply under pressure to an internal. combustion
to pressure changes in said centrifugal pump for
engine is to be controlled, the pump ‘II being
regulating the ?ow of liquid in said duct.
forv example provided to supply oil under pressure
to the engine through the duct I0, or’ may con
ll. vvA system for controlling liquid flow com
prising a duct for liquid, asupply pump for pass
2,407,139
5
ing liquid along said duct and for creating a pres
sure difference therein, a centrifugal regulating
pump for creating a pressure difference smaller
than the pressure difference created by the sup
ply pump and‘ connected to said supply pump
so that the pressure difference created by the
regulating pump opposes the pressure difference
created by the supply pump, a metering ori?ce
located in said duct on the downstream side of
said pump, a second metering ori?ce on the 10
downstream side of the ?rst metering ori?ce,
and means responsive to a pressure created by
said regulating pump for adjusting the area of
the second metering ori?ce, whereby the pressure
difference at the two sides of the ?rst meter
ing ori?ce and the rate of liquid flow therethrough is varied in accordance with the pressure
generated by the centrifugal regulating pump.
5. A system for controlling liquid flow com
6
ated by the supply pump and so connected to
the supply pump that, the pressure differences
created by said pumps act in opposition'and liq
uid ?ows through said centrifugal pump in oppo
sition to the pressure gradient therein, and a
pressure-responsive member adapted to be acted
on by a pressure generated by said centrifugal
regulating pump and adapted to actuate the
valve to be regulated.
'7. A liquid supply regulating system compris
ing a duct for the passage of liquid, a supply
pump for feeding liquid to said duct, a variable
speed centrifugal pump connected across said
supply pump so that liquid flows through said
centrifugal pump in opposition to the pressure
gradient therein, a ?uid pressure actuated ?ow
regulating valve in said duct, and means for actu
ating said valve in response to pressure changes
within said centrifugal pump.
’
v
prising a duct for liquid, a supply pump for
8. A liquid supply system as claimed in claim '7
passing liquid along said duct and for creating a
in which the centrifugal pump has a variable
pressure difference therein, a centrifugal regu
e?ective radius.
lating pump for creating a pressure difference
9. A liquid fuel supply system for an internal
smaller than the pressure difference created by
combustion engine comprising a duct, ‘a supply
the supply pump and connected to said supply 25 pump for feeding fuel to said duct, a metering
pump so that the pressure difference created by
ori?ce in" said duct downstream of the supply
the regulating pump opposes the pressure dif
pump, an adjustable ?ow regulating valve in said
ference created by the supply pump, a meter
duct downstream of the metering ori?ce, an i
ing ori?ce located in said duct on the downstream
engine driven centrifugal pump with a periph
side of said pump, a second metering ori?ce
eral inlet connected to said duct between the
on the downstream side of the ?rst metering
supply pump ‘and metering ori?ce whereby fuel
ori?ce, and pressure-responsive means acted
is passed throiigh said centrifugal pump in oppo
upon in opposition by a pressure created by the
sition to the pressure gradient therein, a pres
centrifugal pump and by the pressure in said
sure responsive member connected to the ?ow
duct between said metering ori?ces for adjust 35 regulating valve and on which thepressure at
ing the area of the second metering ori?ce,“ the low pressure side of the metering ori?ce acts a
whereby the pressure difference at the two sides
in opposition to a pressure generated by the
of the ?rst metering ori?ce and the rate of liq
centrifugal pump downstream of its peripheral
uid flow therethrough is varied in accordance
inlet, whereby said flow regulating valve is con
with the pressure generated by the centrifugal 40 tinuously adjusted to maintain the pressure drop
regulating pump.
'
across the metering ori?ce‘ proportional to the
6. A system for regulating ‘an adjustable flow
pressure drop existing across the centrifugal
control valve, comprising a duct, a supply pump
pump and hence to the square of, the engine
for passing liquid along said duct and for cre
speed.
ating a pressure difference therein, a centrifugal 45
' WILLIAM CHARLES CLOTHIER.
regulating pump for creating a pressure differ
BEATRICE NAYLOR.
ence smaller than the pressure difference cre
JOHN ERNEST PATRICK DUNNING.
Документ
Категория
Без категории
Просмотров
0
Размер файла
651 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа