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Патент USA US3058736

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Oct. 16, 1962
A. D. GOETTL
3,058,726
WATER RECIRCULATING DEVICE FOR EVAPORATIVE COOLERS
Filed May 5, 1960
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INVENTOR.
D. GOETTL
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is a blower 16 disposed to deliver cool air through a duct
3,058,726
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WATER RECRCULATING DEVECE FOR EVAPO
RATIVE CQGLERS
Adam D. Goettl, Phoenix, Ariz., assiguor to McGraW
Edison Company, Milwaukee, Wis, a corporation of
Delaware
Above each pad is a water trough 20 which receives
water from a tube 22 of a manifold 24. The manifold
24 is located in the upper portion of the evaporative
cooler so that the tubes 22 may deliver Water to the
troughs 20 and water my gravitate therefrom through the
pads 14 and downwardly into a sump 26.
,
Filed May 5, 1966, Ser. No. 27,026
5 Claims. ((11. 261-29)
This invention relates to a Water recirculating device
for evaporative coolers and more particularly to a water
recirculating device for evaporative coolers wherein
water under pressure is utilized to aspirate water from
the sump of an evaporative cooler and pump it to the
upper portions of evaporative cooler pads and wherein
a vacuum tank at the inlet of the ‘aspirator is provided
with a ?oat valve to prevent ‘over?ow of the evaporative
cooler sump when water pressure is too low to operate
the aspirator.
Recirculating devices of the prior art have utilized
aspirators and vacuum tanks to pump water from the
sump of an evaporative cooler and to deliver such water
to the upper portions of the evaporative cooler pads. In
these devices, the amount of water evaporated from the
pads is greater than the amount of Water utilized under
pressure to operate the aspirator. However, in such prior
art devices, reverse ?ow, through the aspirator, may be
caused by a reduction in water pressure passing through
the jet tube of the aspirator. Such reduced pressure of
the water passing through the jet tube, which permits re 30
verse ?ow into the vacuum tank, causes the water to pass
through the vacuum tank and backwardly into the sump
Communicating with the inlet of the manifold 24 is a
supply tube 28 which communicates with a jet tube
aspirator 30 having a ?ared tube 3-2 extending into a vac
uum tank 34 which receives water through a tube 36
which has its lower end 38 disposed in a screen 40 below
the water level A in the sump 26. A water pressure tube
42 supplies water under pressure to a jet nozzle 54 of the
jet tube aspirator 3t) and this tube 42 communicates
through a T joint 44 with a water pressure supply con
duit 46.
Also coupled to the T is a ?oat valve 48 which is pro
vided with a ?oat 50 disposed to control the water level
in the sump 26 at the level A.
As shown in FIG. 2, the jet tube aspirator assembly 30
is provided with the ?ared tube 32 which is coupled
directly to the conduit 28 to deliver water thereinto. Con
centrically of the ?ared tube 32 is a nozzle portion 54 of
a jet tube 43.
The tube 32, at its ?ared open end 58, is disposed near
the bottom of the vacuum tank 34 to receive water there
from.
'
High velocity and high pressure ?ow ‘of water through
the nozzle 54 of the jet tube 43 creates a low pressure
therearound in the ?ared open end 58 causing Water to
?ow through the tube 32 and around the nozzle 54 and to
be projected through the tube 28 to the manifold 24
During such ?ooding action, the water pressure is so low
that water is not rapidly delivered to the evaporative 35 which delivers water through the tubes 22 to the troughs
20 above evaporative cooler pads 14.
cooler pads, due to the fact that it drains downwardly
The water inlet tube 36 comprises a downwardly pro
into the sump.
jecting portion 60 provided with an annular Valve seat 62
Accordingly, it is an object of the present invention to
which extends downwardly into the vacuum tank 34.
provide a water recirculating device for evaporative
It will be understood that a hermetically sealed condi
coolers wherein an aspirator is utilized to create low
tion of the tubes 32, 43, and 60, in the tank 34 is neces
pressure in a vacuum tank communicating with the sump
sary so that a vacuum may be drawn in the tank 34 to
of an evaporative cooler and wherein a ?oat valve in
cause low pressure in the supply tube 36 to force water
the vacuum tank is disposed to shut off communication
upwardly into the vacuum tank 34.
with the evaporative cooler sump when the vacuum tank
45
Cooperatively associated with the annular valve seat
?lls with water due to a low pressure condition ‘of ?uid
62 is a conical portion 64 of a ?oat valve 66 which is
in the jet tube of the aspirator.
guided concentrically of the tube 60 by guide rods'68
Another object of the invention is to provide a water
which are secured to the outer side of the ?oat 66 and
recirculating device for evaporaitve coolers which utilizes
extend in close proximity to the sides of the tank ‘34. This
a vacuum tank and a jet tube \aspirator and wherein a
50 ?oat valve 66 is a hollow valve member having its upper
?oat internally of the vacuum tank is designated to shut
conical seat surface 64 disposed in the annular seat 62
otf communication of the vacuum tank with the evapora
of the tube 60 to prevent back flow of water through the
tive cooler sump when the vacuum tank becomes ?lled
tube 36 and into the sump 26 ‘of the evaporative cooler 10.
due to a low water pressure condition in the jet tube of the
aspirator whereby closing of the ?oat valve forces water 55 The tubes 32 and 43 are provided with screw threaded
?ttings 33 and 45, respectively, which are screw threaded
to pass on through the aspirator and to the evaporative
in bosses 47 and 49, respectively, located at opposite
cooler pads of the evaporative cooler.
sides of the vacuum tank 34. Couplings 51 and 53 per
Further objects and advantages of the invention may be
mit the tubes 32 and 43, respectively, to be screw thread
apparent from the following speci?cation, appended
ably removed from the vacuum tank 34 for cleaning the
claims, and accompanying drawings, in which:
60 nozzle 54 and ?ared end 58.
FIG. 1 is a side elevational view of an evaporative
In operation, water under pressure enters the supply
cooler showing portions broken away and in section and
conduit 46 and passes inwardly through the ?oat valve 48
illustrating the water recirculating device for evaporative
until the ?oat 50 reaches a level A at which the water
coolers of the present invention installed in the cooler;
in the sump 26 is maintained.
and
\
65
Water which passes under pressure through the tube
FIG. 2 is an enlarged fragmentary sectional view of the
43 and its nozzle 54 creates a partial vacuum in the ?ared
vacuum tank and jet tube aspirator assembly of the pres
of the evaporative cooler, thereby ?ooding the same.
ent invention.
.
tube portion 58 which forces water upwardly through
the tube 32 and from the tank 34.
As shown in FIG. 1 of the drawings, an evaporative
Due to the capacity of the vacuum tank, and the nega
cooler 10 is provided with a conventional housing having 70
tive pressure created, water will ?ll the tank above the
air inlet louvers 12. inwardly of these louvers are
open end 58 of the tube 32 and water at a low level sup
evaporative cooler pads 14. Internally of the pads 14
3,058,726
3
d.
ports the ?oat valve seat portion 64 away from the an
tion of said water supply means relative to said aspirator
nular seat 62 of the tube 60 so that water may readily
means.
a
?ow into the tank v34. Thus, the jet tube aspirator assem
bly 30 is always primed after water ?ows into the tank 34.
It will be understood that evaporation in the pads '14,
utilizes more water than is supplied through the jet tube
nozzle 54, and that the water passing into the planed end
2. In a water recirculating device for evaporative cool
ers the combination of: an evaporative cooler having
evaporative cooler pads; ?rst means for forcing air there
through; second means for supplying water to the upper
58 of the tube 32 amounts to a considerably greater
water to said second means; a vacuum tank means dis
volumn than that supplied through the jet tube nozzle 54.
portions of said pads; aspirator means for supplying
posed to supplywater to said aspirator means; said aspi
Inasmuch as the water used by the evaporative cooler 10 rator means having an aspirator cooler having a sump
pads 14 is more than that supplied through the jet tube
to receive water which drains from said pads; a supply
nozzle 54, the float valve 48 controls the level A in the
tube communicating with the interior of said vacuum
sump 26 by means of the ?oat 50 and thus a normal
tank and the water in said sump; a water pressure supply
supply of water is provided at the open end 38 of the
means communicating with said aspirator means; a ?oat
supply tube 36 which permits water to be recirculated
valve communicating With said water pressure supply
through the pads 14 by the vacuum tank 34, jet tube
means for maintaining a given level of water in said
aspirator 30, tube 28, manifold 24, and tubes 22.
sump; and a ?oat valve in said vacuum tank disposed to
In the event water pressure in the tube 42 is reduced
shut off flow of water from said vacuum tank to said
to a level or value at which the water issuing from the
supply tube when water rises in said vacuum tank in
nozzle 54 will not create a partial vacuum in the tank 20 response to low pressure operation of the water supply
34, water tends to ?ll the tank 34. As the tank ?lls up,
means relative to said aspirator means; said water pres—
the ?oat valve 66 rises until its seat 64 closes with the
sure supply means having a jet tube communicating there
annular seat 62 of the tube 60 thereby preventing water
with, said jet tube disposed in said aspirator means;
from ?owing backwardly through the tube 36 and cans
said aspirator means having means surrounding said jet
ing the sump 26 to over?ow.
25 tube and disposed to deliver water therearound from said
When the ?oat valve 66 moves upwardly and closes
vacuum tank to said second means.
with the seat 62, water is prevented from leaving the
3. In a water recirculating device for evaporative cool
vacuum tank 34 and then positive pressure, even though
ers the combination of: an evaporative cooler having
it may be low, issuing from the nozzle 54, is maintained
evaporative cooler pads; ?rst means for forcing air there
in the tube 28 which continues to supply Water under 30 through; second means for supplying water to the upper
low pressure through the manifold 24 and tubes 22.
portions of said pads; aspirator means for supplying
' It will be apparent to those skilled in the art that even
though water pressure fails to be maintained at a sul?
ciently high level to operate the aspirator assembly 30,
water to said second means; a vacuum tank means dis
posed to supply water to said aspirator means; said as
pirator means having a ?rst tube disposed to deliver
that the evaporative cooler pads will still receive some 35 water from said vacuum tank to said second means; said
water to maintain them in effective operating condition.
evportive cooler having a sump to receive water which
As hereinbefore pointed out, the amount of water
drains from said pads; a supply tube communicating
which may ?ow through the nozzle 54 is less than that
with the interior of said vacuum tank and water in said
which will be utilized by the evaporative cooler pads 14.
sump; a water pressure supply means communicating
40 with said aspirator ‘means; a ?oat valve communicating
Thus, the evaporative cooler sump will not over?ow.
It will be understood by those skilled in the art that
with said water pressure supply means for maintaining
water troughs 20 distribute whatever water issues from
a given level of water in said sump and a ?oat valve in
the tubes 22 evenly over the pads 14 so that they will
said vacuum tank disposed to shut off ?ow of water from
use the water passing from the nozzle 54 even when the
said vacuum tank to said supply tube when water rises
water issues under low pressure. Thus, the water pass
in said vacuum tank in response torlow pressure opera
ing from the nozzle 54 through the tubes 22 does not
tion of said water supply means relative to said aspirator
cause over?ow of the sump 26 because the evaporative
means; said ?rst tube communicating with the lower in
cooler pads'14 are maintained in operation and they
terior of said vacuum tank.
_
cause su?‘icient evaporation to account for the water which
4. In a water recirculating device for evaporative cool
passes from the nozzle 54 under low pressure supply 50 ers the combination of: an evaporative cooler having
conditions.
evaporative cooler pads; ?rst means for forcing air there
It will be obvious to those skilled in the art that various
through; second means for supplying water to the upper
modi?cations of the present invention may be resorted
portions of said pads; aspirator means for supplying
to in a manner limited only by a just interpretation of the
water to said second means; a vacuum tank means dis
following claims.
55 posed to supply water to said aspirator means; said as
I claim.
pirator means having a ?rst tube disposed to deliver water
1. In a water recirculating device for evaporative cool
from said vacuum tank to said second means; said evap
ers the combination of: an evaporative cooler having
orative cooler having a sump to receive water which
evaporative cooler pads; ?rst means for forcing air there~
drains from said pads; a supply tube communicating with
through; second means for supplying water to the upper 60 the interior of said vacuum tank and water in said sump;
portions’ of said pads; aspirator means for supplying
a water pressure supply means communicating with said
water to said second means; a vacuum tank means dis
aspirator means; a ?oat valve communicating with said
water pressure supply means for maintaining a given level
posed to supply water to said aspirator means; said aspi
rator means having a ?rst tube disposed to deliver water
of water in said sump; and a ?oat valve in said vacuum
from said vacuum tank to said second means; said evap 65 tank disposed to shut 01f ?ow of water from said vacuum
orative cooler having a sump to receive water Which
tank to said supply tube when water rises in said vacuum
drains from said pads; a supply tube communicating with
tank in response to low pressure operation of said water
the interior of said vacuum tank and water in said sump;
supply means relative to said aspirator means; said as
a water pressure supply means communicating with said
pirator means disposed in the lower interior of said
aspirator means; a ?oat valve communicating with said 70 vacuum tank and in priming liquid therein.
water pressure supply means ‘for maintaining a given
5. In a water recirculating device for evaporative cool
level of water in said sump; and a ?oat valve in said
ers the combination of: an evaporative cooler having
vacuum tank disposed to shut o? ?ow of water from
evaporative cooler pads; ?rst means for forcing air there
said vacuum tank to said supply tube when water rises
through; second means for supplying water to the upper
in said vacuum tank in response to low pressure opera 75
portions of said pads; aspirator means for supplying
3,058,726
5
water to said second means; a vacuum tank means dis
posed to supply water to said aspirator means; said aspira
tor means having a ?rst tube disposed to deliver water from
said vacuum tank to said second means; said evaporative
cooler having a sump to receive water which drains from
said pads; a supply tube communicating with the interior
of said vacuum tank and water in said sump; a Water
pressure supply means communicating wih said aspirator
means; a ?oat valve communicating with said water pres
sure supply means for maintaining a given level of water
in said sump; and a ?oat valve in said vacuum tank dis
posed to shut off flow of water from said vacuum tank
to said supply tube when water rises in said vacuum
6
tank in response to low pressure operation of said water
supply means relative to said aspirator means; said as
pirator means comprising a ?ared tube and a jet tube
therein, said aspirator means disposed in the lower por
5 tion of said tank and in priming liquid therein
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,147,702
2,327,242
2,658,735
2,757,617
2,800,313
Bower ______________ __ July 27,
Bolcom ____________ __ Aug. 17,
Ybarrondo __________ __ Nov. 10,
Moore ______________ __ Aug. 7,
Targosh et Ia1. ________ __ July 23,
1915
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