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Aug- 3.- 1948-
Y
L. c. LOVE r-:r AL
PRECQOLER SYSTEM FOR REFRIGERATED
DRINKING FOUNTAINS
2,446,289
Filed Jan. 8, 1948
avwmvtm
.Eee a Love
6‘.
envy ,S'laulér
, Richard E?rl‘izaefer =72’
Gum/wen;
Patented Aug. 3, 1948
2,446,289 1
UNITED STATES PATENT OFFICE ,
2,446,289
PRECOOLER SYSTEM FOR REFRIGEBATED
DRINKING FOUNTAIN S
Lee 0. Love and 0. Henry Slauter, Columbus, and - .
‘Richard H. Orthoefer, Jn, Worthington, Ohio,
assignors to The Ebco Manufacturing Com
pany,,Columbus, Ohio, a corporation of Ohio
Application'lanuary 8, 1948, Serial No. 1,108
4 Claims. (Cl. 257-179)
This invention deals with heat transfer appa-i
ratus, and has particular. reference to an im
proved liquid pre-cooling system of the type uti- '
lized in conjunction with refrigerated water cool
ers or drinking fountains for initially cooling 5
incoming fresh water prior to the passage thereof
through the associated refrigerating system of
the drinking fountain.
In the past, numerous attempts have been made
are maintained in direct contact over a relatively
large area, wherebythe degree of coolness of the
outgoing waste water may be e?lciently trans
ferred to the incoming and uncooled fresh water
prior to its passage through an associated refrig
erating system.
‘
These and other objects and advantages will
become more apparent with a further understand
ing of the present invention, which is to be had
in connection with refrigerated water coolers or 10 by reference to the following description and the
drinking fountains to initially cool incoming fresh
appended drawing wherein: .
water prior to the passage thereof through the
Fig. 1 is a side elevational view, partially in
associated refrigerating apparatus, and the dis
vertical section, of a water cooler embodying the
charge thereof from the associated bubbler valve
present improved pre-cooler;
of the drinking fountain, by making use of waste 15 Fig. 2 is an enlarged detailed vertical sectional
water which has been previously cooled by the
view, partially in elevation. of a pre-cooler assem
refrigerating apparatus, and which maintains a
bly formed in accordance with the present inven
relatively low temperature after being discharged
tion;
from the bubbler valve of the fountain, in order
Fig. 3 is a horizontal sectional view taken along
that economical and e?icient use may be had of 20 a plane indicated by the line 3-3 of Fig. 2.
the refrigerating system of the cooler._ The pri
Referring now to the drawing, the numeral 5
mary difliculties encountered with prior pre-cooler
generally designates the casing of an electrically
systems were caused by (their failure to effectv
refrigerated water cooler or drinking fountain
efficient heat transfer between the incoming
having a discharge or bubbler valve 6 through
fresh water and the waste or drainage water; it 25 which refrigerated fresh water is discharged for
being understood that such heat transfer, in order
drinking purposes. Disposed below and adjacent
to be economically practical, must necessarily be
to the bubbler valve 8 is a basin or sink 1 for the
accomplished by conduction through the walls
reception of waste water discharged from the
of the respective conduits employed in conducting
bubbler valve when the latter is operated by
incoming fresh water to the cooler and outgoing 3.0.: means of the manually controlled valve handle 8.
waste water therefrom.
,
It will be understood, that the basin or sink ‘I
‘It follows therefore, that the primary object
may be formed in any suitable manner to receive
of the present invention is to provide a heat trans
and collect waste water from the bubbler valve,
, fer assembly which makes ei?cient and economi
cal use of the waste water being discharged from
a drinking fountain to initially cool the incoming
fresh water prior to its passage through the re
frigerating apparatus of ‘the drinking fountain.
It is another object of this invention to provide
an improved pre-cooler assembly for refrigerated
water coolers which consists of a vertical drainage
tube in which is formed a spiral courseway over
which the normally cool waste water of the water
cooler must pass during its discharge from the
cooler, and a relatively smaller inlet water pipe
spirally wound about the outer surface of the
drainage tube, in order that the incoming water
may beinitially cooled by the waste water by
conduction through the walls of the separate
pipes or conduits.
,
_
It is a further object of the present invention
and usually embodies a body of generally con
35 caved shape in which.is disposed at the lower
‘ ' region thereof a drainage opening 9 for the dis
charge of waste water by gravity from the sink
7 into an associated drainage conduit or tube.
In accordance with the present invention, use
40 is made of ‘a substantially vertically arranged
drainage tube or waste water conduit l0 whose
upper end is joined in any suitable manner as at
H with the drainage outlet formed in the asso
ciated sink 1 of the cooler apparatus. The waste
45 conduit Ill is preferably formed from a suitable
' " metal having a relatively high degree of heat con
ductivity, such as copper or aluminum or the like,
and which is formed‘ along the outer side walls
thereof with a continuous spiralled recess I!
50 which extends substantially throughout the length
of the drainage tube. The recess I2 is de?ned
to provide an improvedlpre-cooler assembly for
by the outer side walls of the tube which are
refrigerated drinking fountains wherein the me
depressed inwardly and upwardly of the tube to
tallic walls of the associated drainage water outlet
form the inwardly and slightly upwardly disposed
tube and the walls of the fresh water inlet tube 55 recess l2 along the outer surface of the tube, and
2,440,289 ’
4
3
to form along the interior surface thereof a con
employed within the discharge sink ‘I of such
tinuously spiralled downwardly and outwardly
water coolers for the purpose of straining or
?ltering solid or foreign particles from the drain
age water to prevent clogging the drainage system
of the cooler. It will be understood, that the
speci?c location of the de?ector plate I‘! is deemed
immaterial to the present invention so long as the
same occupies a position substantially at the up
extended spiral courseway throughout the length
per end of the drainage tube I!) in order that
of the drainage tube l0, and will be prevented 10 water may be de?ected initially against the side
by nature of the outwardly inclined disposition
walls of the tube. rather than being permitted to
of the shelf from falling or ?owing centrally of
illow directly through the axial passageway there
the tube in a straight downward path by gravity.
The lower end of the drainage tube Ill may ad
While the present invention has been described
vantageously be coupled with an elbow joint ll, 16 as embodying or setting forth a precooler system
for water coolers or drinking fountains, it will be
which in turn, receives a drainage tube extension
l5 extending exteriorly of the water cooler casing
understood that the aspects of ‘the same are
adaptable for use in many other capacities‘ where
5 for connection with a suitable sewage disposal
e?lcient heat transfer is desirable orrequired», and
conduit, not shown.
spirally wound about the outer surface of the 20 wherein a liquid medium ?owing by gravity is
drainage tube l0, and occupying the spiralled
utilized to transmit or absorb heat to or from a
?uid medium conducted by the outer spirally
recess I2, is ‘a relatively smaller fresh water inlet
conduit l6 which has its lower end connected
wound and smaller conduit.
'
It should be pointed out, that in forming the
either internally of the water cooler casing, or
externally thereof with a suitable fresh water 25 interior ledge I3 of-the liquid receiving drainage
conduit iii in an outwardly and downwardly in
supply source, not shown, and has its upper end
clined manner, that liquids introduced along the
connected with or disposed within a suitable re
frigerating system, also not shown, carried within
interior wall surface of the conduit will neces
sarily be retained upon the shelf or ledge, and will
the casing 5 of the water cooler, and to which is
connected the conduit associated with the bubbler 30 consequently be made to follow the continuous ex
tended courseway throughout the length of the
valve 6. The portion of the conduit l6 which
tube, thereby increasing the surface area which is
occupies the spiral recess I! is formed so as to
subjected to conductive heat transfer. Were it
closely conform to the walls of the recess, in order
not for the outwardly inclined nature of the shelf,
that direct contact is maintained between a large
portion of the outer surface of the inlet conduit 36 liquids ?owing downwardly through the tube by
gravity. would necessarily spill toward the center
l6 and the walls of the tube l0 which de?ne the
of the tube thereby reducing the e?icieney of the
spiralled recess I2. As in the case of the material
system by reducing the surface area over which
comprising the drainage tube N, the inlet conduit
the liquid maintains direct contact.
I6 is preferably formed from a metal having a
high degree of heat conductivity, in order that 40 Whileh. preferred embodiment of the present
invention has been disclosed in detail, it will be
emcient heat transfer may be had between the
contacting surfaces of the respective conduits.
understood that various modi?cations as to de
tails of construction may be accomplished with
Preferably, connection between the two conduits
is accomplished by soldering or brazing the re
out departing from the spirit of the invention, or
the scope of the following claims.
spective outer surfaces of the conduit continu
we claim:
'
ously along the plane of the outer side walls of
1. Heat transfer apparatus comprising a sub
the drainage tube III, in order that direct contact
stantially vertically arranged straight liquid-re
between the two tubes is maintained throughout
ceiving conduit having a liquid inlet at its upper
the length of the recess 12.
'
In order to assure that waste water being dis
end and a liquid outlet at its lower end, said con
charged from the sink ‘I is directed against the
duit being formed with a continuous downwardly
interior wall surface of the drainage conduit 10,
spiralled recess in the outer side walls thereof,
provision is made, in the form of an inclined de
the walls of said conduit which de?ne said re
?ector plate or shelf I‘! for directing the waste
cesses being upwardly inclined toward the center
water being discharged from the sink outwardly
line of'said conduit and extending inwardly there
along the interior surface of the drainage con
of, said walls forming a continuous downwardly
spiralled and outwardly inclined shelf along the
duit ll, whereby such waste water is initially in
troduced upon the downwardly and outwardly in
inner side walls of said conduit, means disposed at
clined shelf l3, and prevented from ?owing
the inlet end of said conduit for directing incom
straight downwardly through the central portion
ing liquids against the inner side wall of said con-_
duit, and a second ?uid-receiving conduit dis—
of the drainage conduit. In this manner, waste '
posed within the spiralled recess of said ?rst,con
water is made to follow the extended courseway
duit. said second conduit throughout its length
provided by the spiralled shelf l3, thereby trans
having a portion of the outer surface thereof
mitting its degree of coldness to the walls of the
maintained in direct contact with the outer side
tube III which de?ne the spiral recess, and thence
walls of said ?rst conduit de?ning said recess,
by conduction through the walls of the inlet con
whereby heat transfer may be had between ?uids
duit It to the incoming fresh water carried there
conducted by the respective conduits by conduc
by. Thus it will be seen, that incoming fresh
tion through the walls thereof.
water carried by the tube It will be initially cooled
2. Heat transfer apparatus comprising a sub
prior to entering'the refrigerating system of the
stantially vertically arranged liquid-receiving
cooler by the passage of the previously cooled
conduit having the outer side walls thereof formed
waste water throughout the length of the shelf or
with a continuous downwardly spiralled recess.
ledge IS. The de?ector plate II, as shown in Fig.
the side walls of said conduit which de?ne said
2, may advantageously be carried or formed in
tegral with a ?lter plug I! of the type normally 76 recess being depressed inwardly and upwardly of
inclined shelf or ledge l3. By nature of the down
ward and outward disposition of the ledge II
with respect to the interior side walls of the tube,
it will be seen that liquid introduced interiorly
of the tube along the interior surface thereof will
?ow over the upper surface of the shelf ii in an
0
to
.
-
5
.
4. A pre-cooler assemly for refrigerated drink- ;
said conduit whereby, to form along the interior ‘
ing fountains comprising a substantially vertical
surface thereof a downwardly and outwardly in
ly disposed drainage tube for the reception of
clined spiralled shelf over which liquids intro
waste water discharged from a drinking foun- '
duced along the interior surface of said conduit
tain, said tube having the outer side walls thereof
may passby gravity, means disposed at the upper
depressed inwardly and upwardly of said tube
end .of said conduit for directing liquids intro
whereby to form an inwardly concave and con- '
duced therein against the interior surface of said
tinuous spiralled recess‘ extending substantially
conduit, and a second ?uid-receiving conduit
throughout the length of said tube, the side walls
spirally wound about the outer surface of said first
conduit and occupying the recess formed therein, 10 of said tube de?ning said recess forming along the
interior ‘surface of said tube a downwardly and
said second conduit having a portion of its outer
outwardly inclined continuous shelf over which
surface throughout its length maintained in di
waste water introduced within the upper portion
rect engagement with the outer surface of said
first conduit, whereby heat ‘transfer may be had I’ of said tube may pass by gravity ?ow, and a fresh
between ?uids conducted by the respective con 15 water inlet conduit spirally wound about the outer
surface of said drainage tube within the recess
duits by conduction through the adjoining walls
formed therein, said inlet conduit having its outer
thereof.
surface maintained in direct contact with the
3. Heat transfer apparatus comprising a sub
outer surface of said drainage conduit. whereby
.,stantially vertically arranged cylindrical liquid
’recelving conduit formed along its outer surface 20 incoming water carried by said inlet conduit may
be cooled by waste water passing over the shelf
with an inwardly and radially disposed down
formed upon the interior surface of said tube by
wardly spiralled recess, the latter being de?ned by
conduction through the contacting surfaces of
the outer side wall of said conduit, the side wall of
said conduit and said tube.
vsaid conduit being depressed inwardly and up
' LEE C. LOVE.
wardly of said conduit whereby to form along the 25
0. HENRY SLAU'I'ER.
interior surface thereof a downwardly and out
RICHARD H. ORTHOEFER, Jn.
wardly inclined spiralled shelf over which liquids
introduced along the interior surface of said con
dui-t may pass by gravity, means carried within
the upper portion of said conduit for directing 30
liquids introduced ‘therein outwardly against the
.interior surface of said conduit, and a second
spirally wound fluid-receiving conduit disposed
REFERENCES CITED
The following references are of record in the
?le of this patent:
UNITED STATES PATENTS
Number
Name
Date
within the spiralled recess formed in said ?rst
conduit, said second conduit having a portion of 35
640,122
its outer surface throughout its length main
1,114,964
tained in direct engagement with the outer sur
1,492,696
face of said conduit de?ning said recess, whereby
2,010,504
heat transfer may be had between ?uids con
2,127,848
ducted by the respective conduits by conduction I40 2,276,964
through the adjoining walls thereof.
Foreman _________ __ Dec. 26, 1899
Christensen ______ _;.. Oct. 27, 1914
Moericke __________ .. May 6, 1924
Askin _____________ -_ Aug. 6, 1935
Smith ____________ _- Aug. 23, 1938
Grove _' ___________ -.. Mar. 17, 1942
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