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Патент USA US2408375

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Oct. 1, 1946.
|_. J. CLAPSADLE' El'AL '
>
2,408,374
cooune SYSTEM FOR INTERNAL-COMBUSTION ENGINES
Filed'Nov‘. 11, ,1943
ENGINE BLOCK
VENTURI
' l0
15,
<_‘
54
.
mvzu'rons
LEO J. CLAPSADLE
JAMES c. KRATZER
ERIC E SOMMER
BY
b
‘
ATTORNEY
.1,‘
.
2,408,374
3
4
may include a second coolant reservoir serving at
which carries a safety valve 48, and leads to an
outboard vent 50 through an adjustable dia
phragm pressure release valve 52. The latter
least one of the usual purposes of an expansion
tank. There is no coolant ?ow through the static
reserve tank, or in any event no more than a very
small flow of liquid, and this tank is connected in
valve can be adjusted to control and hold a pres
sure which will prevent free boiling and excessive
loss of vapor from tank 3_0,-and with, the aid of
with thelinain circulation linevatmor- near, the
point where lowest pressure in the system usually
a""small,ori?ce plate 5lgjustraheadlof the valve
occurs. The latter point is normally in the vicin
52, venting of this valve can take place without
ity of the propeller eye of the pump, but for con-, .4, -_ allowing the system to equalize in pressure with
venience, and to alleviate mechanical difficulties 10 the outside atmosphere.
in making an attachment at this position; 'ajlowfl"
pressure point can be created outside the pump
by means of a Venturi tube, or similar device,
Thus the liquid head pressure of the: coolant in >
the static tank and connecting leg is impressed
on the system, which raises the pump pressure
accordingly, and causes the minimum pressure.v ,
point in the system to be “transferred’to, and ‘
remain in, the static tank. Suitable vaporfvent?
ing means on the static tank aid in maintaining 20
the pressure, control indicated, and permitv an
'{A connection pipe 54 joins the static tank 30
to the throat of the Venturi 22, but since the sys
tem is completely closed and the main circula
tionH.-line is entirely ?lled with coolant liquid,
there is, very‘ little, if any, coolant flow into the
Venturiv throat fromv the static tank. Thus the
static liquid head pressure of the coolant in tank
30' and its'connectingleg is impressed at the point
of lowest pressure in the system, and in accord
ance with the well-known hydraulic laws of
Bernoulli, a corresponding pressure boost occurs
over-allpressurizing effect on the'system which
in the pump, and'the pump intake pressure always
is__not substantially greater thanthat required
exceeds the pressure in the static tank by an
toobtain continuouslya full circulation of cool
ant, ;,‘ With additional means‘ for holding the‘teni-v 25
perature of the coolant in the static tank higher
than, it is in the pump, boiling will not-occur at,‘
vapor binding. is prevented under all altitude con-.
.
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'
'
_~ The accompanying drawing ‘will 'beefurther'
trifugal tank 28, being taken directly from the
engine block, keeps. the static tank coolant at a
higher 'temp'erature'than the ?uid entering the
or near, the pump; and pump cavitation and
ditions-
amount approximately that of the static liquid
headaat' the Venturiv throat. The coolant in cen
pump from the radiator, and this provides fur
30 ther assurance that boiling in the static tank will
always occur before the coolant ?owing to the
Hence a
self-balancing pressurizing effect is attained, re
will’produce results as alleged.
_ .
gardless of altitude conditions, and full pump
‘ ,In vthe drawing a primary circulating system 35 circulation rate continues under all normal engine
descriptive of the invention, and shows vdiagram
matically a cooling system embodimentwhich
pump reaches boiling' temperature.
is indicated for the engine block ill as’, including
connective pipe l2, radiator-(I4, connective vpipe
16,; pump I8 vand connective pipe 2i}.v This pri
operating conditions.
"
It Will'be understood that many modi?cations‘
over the systemspeci?cally described are possible,
utilizing the essential features of the invention.
As previously indicated a similar statictank as
sembly can be used without the Venturi-to pro
mary circulating system according to our inven
tion will also preferably include the Venturi tube
22,,as shown just before the‘pump in connective
pipe’ [6. The secondary; circulating system,
through which. there ,isgonly a partial coolant
circulation, includes connective pipe 24, leading
leg of this t'ankvis joined to the system directly
at the pump intake, or at another positionv where
from engine block In to an expansion tank 28,
and the return, pipe 2'! connecting the expansion
minimum pressure exists. In place of;the Yen,
turi tube, anordinary ori?ce, Pitot tube, or sim
tank to the inlet of the pump.
- '- ‘
duce good results,.in which case the connective
ilar device may be used to create a suitable low
,
‘Within the expansion tank 28 there is a second
pressure zone before the pump. _ Maintenanceof
tank 38, which constitutesa static coolant reserve
asuitable temperature in‘ the static tank liquid
tank- as previously described. , The tank 28 is
can be conveniently accomplished as shown, but
a heat exchange arrangement withthe hot engine
exhaust gases, or. a surrounding;- rheostat-con
preferably designed asja centrifugain order to
deaerate continually the coolant, ‘and since it
completely surrounds the tank 3ll,'the coolant in
botlrtanks is? kept at approximately the same
temperature, The two tanks are connected ‘by
trolled electric heatenare other Waysof attain
55
means of a pipe 32 of‘ small diameter, the latter
being provided with ‘a needle valve 34 which can
bevclosed‘yby the projection 35 onv top of the valve
ing the same’ end, and maybe equally suitable;
With a, modi?ed heating means vfor the static
tank, the latter may be’ entirely separate from
the expansion tank assembly, without a venting
meansbetween the two tanks; in which case
?oat't?q Valve 34'willjnormally' be held in the;
thereneed beno ?ow of fluid whatever through,
closed position ‘because of-the buoyant effect of 60 the static reserve tank. _It is notessential that
the liquid in tank; 23, but will open to allow exit
0f;airgfrom_tank 28 as entrained air is discharged
andcollects at the top portion of this centrifuge
tank. _-Pipe_ 32, and, associated parts, will readily
the. expansion tank be of centrifuge structure, as
one of more conventional type may be satisfac
permit flow of, air or vapor, but thevneedle valve
tion the statictank itself might begmade to serve
the additional. function of the. usual expansion
tank as areservoir for excess coolant; “Many-em
bodiments' inthe way-of valves andventing means
34, prevents substantial liquid flow between the
tanks.
"
I
;
.
,
-‘ . The pipe 33, with cap 40, providesa ?ller port
ion-the system, ,I and ‘carries a bleeder pipe-42,
tory, where continual deaeration of the coolant-is
not necessary or desired, andvin thelatter situa
on both; the expansion tank and the static tank
which connects‘v with the ?oat chamber extension 79 may alsonbeappropriate to maintain- the required
orrtank 28L .jThis'bleeder pipe 42 is for the pur
pressure control in;the‘system, and the relative
pose of venting?air during the initial ?lling, so
positions and dimensions of the respective parts
thatlco?mplete distribution of the coolant occurs
throughout the system. _The vstatic coolant re
serve‘itankatqmis provided with/a ven'tjpipe- 4.6, 7.5
illustratedcan be varied to adapt the invention
to,di?erent engine assemblies.
,
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,
_
_ The, above and other. modi?cationswillfbeobf
2,408,374
6
5 .
pump, and a venturi before the intake to said
vious to those skilled in the art, and are intended
to be included within the broader scope of the
invention as de?ned in the appended claims.
We claim:
pump; an expansion tank connected to permit at
least partial circulation of e?luent engine block
coolant; a static coolant reserve tank within said
'
expansion tank and in heat exchange relationship
with the coolant therein; a connection from said
1. In a liquid cooling system for internal com
bustion engines having a primary circulation line
including the engine block, a radiator and cool
ant pump, the combination of a coolant reservoir
through which no substantial fluid flow occurs,‘
static tank to the throat of said venturi through
which liquid head pressure of the static tank
coolant is impressed on the system; and pressure
venting means on said static coolant reserve tank
to control the vapor pressure therein.
a connection from said reservoir to a point of
normal low pressure in said primary circulation
line, whereby head pressure of the reservoir cool
ant is impressed on the system, and means main
taining the temperature of said reservoir coolant
higher than the temperature of the coolant in
the circulation line at said ‘connection point.
2. A system as ‘de?ned in claim 1, in which the
speci?ed temperature of the reservoir coolant is
maintained by heat exchange relation with hot
ef?uent coolant from the engine block.
9..A liquid cooling system for internal combus
tion engines comprising a primary circulation line
including the engine block, a radiator, a .coolant
pump, and a venturi before the intake .to said
pump; an expansion tank connected to permit at
least partial circulation of e?iuent engine block
. coolant; a static coolant reserve tank within said
3. A system as de?ned in claim 1, in which the
point of low pressure in the primary circulation
line‘ is created by a static pressure reducing device
connected before the pump intake.
4.v A system as de?ned in claim 1, which addi
tionally includes a pressure venting means on said
coolant reservoir adapted to control the vapor
pressure therein.
5. A liquid cooling system for internal combus
tion engines comprising -a primary circulation
line including the engine block, a radiator and a
coolant pump; an expansion tank connected to
permit at least partial circulation of e?luent en
expansion tank and in heat exchange relation
ship with the coolant therein; a connection from
said static tank to the throat of said venturi
through which liquid head pressure of the static
tank coolant is impressed on the system; a con
nection between said expansion tank and said‘
static coolant reserve tank adapted readily to per
mi-t venting of air and vapor from the former to
the latter tank and to resist similar flow of liquid;
and pressure venting means on said static coolant
reserve tank to control the vapor pressure therein
while preventing an equalization of pressure with
the outside atmosphere.
.
10. A liquid cooling system as de?ned in claim
9, in which said expansion tank is of a centrifuge
structure adapted to deaerate the coolant circu
gine block coolant; a static coolant reserve tank
positioned in heat exchange relationship with the 35 lating therethrough.
11. A liquid cooling system for internal com
expansion tank coolant; a connection from said
bustion engines comprising a primary circulation
static tank to a point of normal minimum pres
line including the engine block, a radiator, a
sure in the primary circulation line, through
coolant pump, and a venturi before the intake
which head pressure'o-f the static tank coolant'is
impressed on the system; and pressure venting 40 to said pump; a centrifugal expansion tank con
nected to permit at least partial circulation of
means on said static coolant reserve tank to con
ef?uent engine block coolant; a static coolant re~
trol the vapor pressure therein.
serve tank within said expansion tank and in
6. A liquid cooling system for internal combus
heat exchange relationship with the coolant
tion engines comprising a primary circulation line
therein; a connection from said static tank to
including the engine block, a radiator and a
the throat of said venturi through which liquid
coolant pump; an expansion tank connected to
head pressure of the static tank coolant is im
permit at least partial circulation of ef?uent en
pressed'on the system; a connection between said
gine block coolant; a static coolant reserve tank
expansion tank and said static coolant reserve
within said expansion tank and in heat exchange
50 tank adapted readily to permit venting of air and
relationship with the coolant therein; a connec
vapor from the former to the'latter tank and to
tion from said static tank to the pump intake,
resist similar ?ow of liquid, said'connecti'on in
through which liquid head pressure of the static
cluding a valve operated by a ?oat in said ex
tank coolant is impressed on the system; and
pansion tank; and pressure venting means on said
pressure venting means on said static coolant re
serve tank to control the vapor pressure therein. 55 static coolant reserve tank to control a vapor
pressure preventing free boiling, while further
7. A liquid cooling system as de?ned in claim
6, in which said expansion tank is of a centrifuge
structure adapted to deaerate the coolant circu- '
lating therethrough.
,
,
8. A liquid cooling system for internal combus 60
tion engines comprising a primary circulation line
including the engine block, a radiator, a coolant
preventing equalization of pressure with .the out
side atmosphere.
'
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LEO J. CLAPSADLE.
JAMES C. KRATZER.
ERIC E. SOMMER,
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