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Патент USA US3082794

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March 26, 1963
Filed June 17. 1960
R.- McMATf-l
United States Patent O ” ice
Patented Mar. 26, 1963
56 and 58, which extend through the side wall 10 of the
tank into chamber 20 beneath the perforated plate. The
return duct 60 of a bypass line also extends through the
bottom wall 14 in the center of the tank and discharges
Robert R. McMath, Chelmsford, Mass., assignor to
United Aircraft Corporation, East Hartford, Conn., a
corporation of Delaware
Filed June 17, 1960, Ser. No. 36,878
6 Claims. (Cl. 137-207)
This invention relates ot liquid-circulating systems for
use in aircraft and particularly to sumps and sump tanks 10
especially adapted for use in such airborne systems. One
important application of the invention is in connection
with liquid-metal-circulating systems which may be used
in nuclear powerplants for aircraft although the inven
itno chamber 20. This duct is also welded to the bottom
wall 14 of the tank. Fluid in the tank is adapted to
occupy some level approximately midway between the
perforated plate 18 and the cover 12. This liquid level
is shown herein at 62.
The liquid in the system is pressurized by an inert gas
which is admitted through pipe 64. This pipe extends
through the top wall of the tank to which it is welded.
Gas passages 45 are provided in the bell-shaped hous
ings 34 and 36 near the upper end of the upper reduced
15 diameter chambers 42 and 44 therein. Thus, wherever
tion is in nowise limited to this use.
the liquid level may be it is acted upon equally by the
In a nuclear powerplant, for example, it is desirable to
gas both inside and outside of the housings 34 and 36.
have an in-the-line sump tank for the reason of flexibility
The iluid inlet to pump 24 is shown at 68, and the
of installation in an airplane. In general, such a sump
inlet to pump 26 is shown at 70. These inlets, it will be
tank must be mounted at the highest part of the fluid
20 noted, are above the perforated plate 18 and within the
housings 34 and 36.
The sump tank of this invention is intended for use in
In operation, ñuid enters pumps 24 and 26 through
a liquid-circulating system in which no entrained vapor
68 and 70, the ñuid entering the pumps coming
is permissible. At the same time the liquid must be in
from chambers 38 and 40‘ within housings 34 and 36.
contact with a gas for pressurization of the system and to
provide means for absorbing changes in liquid volume 25 This iiuid is discharged by the pumps through discharge
pipes 50 and 52 and after circulating through the sys
due to temperature changes.
«tems returns through inlet pipes 54, `56 and 58. The
Accordingly, it is an object of this invention to pro
vide in a liquid-circulating system a sump tank which
serves as an expansion tank to compensate for in-flight
sump tank, accordingly, is what is known as an in-line
installation and, as previously stated, occupies the high
30 est point in the liquid system. This gives the greatest
temperature changes in a liquid.
ñexibility in installing the sump tank in an airplane.
Another object of this invention is to provide a sump
Insert gas admitted through pipe `64 acts on the entire free
tank having means for the gas pressurization of the sys
surface of the liquid in the tank, gas being admitted to
chambers 42 and 44 through passages 45.
Still another object of this invention is to provide such
By reason of the location of the pump inlets 68 and
a sump tank having means for degassing the liquid in a 35
70 in the undisturbed liquid above the perforated plate
system prior to its admission to the sump pump.
18, the liquid taken into the pumps is degassed prior to
A further object of this invention is to provide a sump
its admission to the pumps. Also, the tank 10` serves
tank which provides sufficient liquid capacity to com
as an expansion tank and provides additional capacity to
pensate for small losses in the piping system due to leak
40 compensate for small leakage in the piping of the sys
These and other objects and advantages of this inven
A further advantage of the sump tank of this inven
tion will become evident or will be speciñcally pointed
tion resides in the ability to pressurize the fluid system
out in connection with the following description of a pre
with an inert gas.
ferred embodiment of the invention shown in the accom
While only a single embodiment of the invention has
panying drawing. In this drawing:
been shown and described herein, it will be evident that
FIG. 1 is a plan view, partly in section, taken on line
many changes may be made in the construction and ar
1-1 of FIG. 2; and
rangement of the various parts without departing from
FIG. 2 is a longitudinal sectional elevation taken on
the scope of the appended claims.
lines 2-2 of FIG. 1.
I claim:
The sump tank of this invention includes an outer 50
1. In combination, a liquid-metal-circulating system in
casing having an oval side wall 10 and top and bottom
a sump tank, a perforated plate supported in
walls 12 and 14. The side wall 10 is provided with an
said tank in spaced relation above the bottom wall of
internal peripheral shoulder 16 adjacent the bottom wall
said tank and parallel therewith, an inverted bell-shaped
to form a seat for an oval perforated plate 18 which
65 pump casing having its open end resting on said plate,
forms a chamber 20 at the bottom of the tank.
a pump in said casing having a ñuid inlet within said
The cover 12 is adapted to be secured to the side
casing above said perforated plate and having a tluid
walls 10 in a fluid-tight manner and to this end has its
outlet extended through said plate and through the bot
periphery 22 overlying the side walls 10 at which a
tom wall of said tank, and a liquid inlet to said tank
suitable fluid-tight seal is maintained. As herein shown,
liquid between the perforated plate and the
the sump tank contains two pumps 24 and 26.
of said tank.
The pumps are enclosed within inverted bell-shaped
2. A liquid-metal-circulating system as claimed in claim
housings 34 and 36, respectively, which consist of lower
1 in which the iluid in the tank is pressurized by an in
annular chambers 38 and 40 and upper smaller diameter
ert gas.
chambers 42 and 44. These inverted bell-shaped hous
3. A liquid-metal-circulating system as claimed in claim
ings 34 and 36 have »their open bottoms resting directly 65
2 in which the tank occupies the highest point in the sys
on and enclosing a portion of the perforated plate 18.
tem and the inert gas serves to pressurize the liquid in
Pump 24 has a discharge pipe 50 which extends down
the system.
wardly through a circular aperture in plate 18 and
4. A liquid-metal-circulating system as claimed in claim
through the bottom wall 14. Preferably, this discharge
pipe is welded to the bottom Wall 14 to make a Huid-tight 70 2 in which the return pipe from a bypass line enters
the tank through the bottom wall and discharges ñuid into
connection. Pipe 26 has a similar discharge pipe 52.
the space beneath the perforated plate.
Fluid enters the sump tank through three inlet pipes 54,
5. In a liquid-metal-circulating system, a sump tank
comprising a pressure-tight enclosure, a perforated plate
in said tank supported in spaced parallel relation above
the bottom wall of the tank, an inverted bell-shaped
pump casing having its open and resting on said perfo
rated plate, a pump in said casing having a tluidinlet
inside said casing and having a iluid outlet duct extending
through said plate and the bottom of said tank,‘a fluid in
let to said tank beneath> said plate, and means for ad
mitting inert gas under pressure at the top of said tank 10
to pressurize the liquid metal in said system.
6. In combination, a liquid-metal-circulating system in
cluding a sump tank having top, bottom and side walls,
a perforated plate in said tank between said top and bot
tom walls dividing said tank into an inlet chamber below
said plate and a pump chamber above said plate, a liquid
inlet pipe for said tank discharging into said inlet cham
ber, an inverted bell-shaped pump casing open at the
bottom having its open bottom seated on said plate and
enclosing a portion of the perforated area of the latter, a
pump in said casing having a liquid inlet within said cas
ing above said perforated plate and having a discharge
pipe extended through said plate and through the bot
tom wall of said tank, and means for pressurizing the
liquid in said tank including a pipe introducing gas
under pressure to the top of said tank.
References Cited in the file of this patent
Curtis _______________ _.. .Tune 1, 1948
Mori _______________ __ Dec.
Kennedy ____________ __ Sept.
Strayter ____________ __ Sept.
Adams ______________ __ Nov.
Germany ____________ __ Nov. 10, 1926
France _____________ __ May 18, 1955
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