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Патент USA US3020735

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Feb. 13, 1962
Filed Sept. 12, 1957
2 Sheets-Sheet 1
Feb. 13, 1962
Filed Sept. 12, 1957
2 Sheets-Sheet 2
United States Patent O F 1C6
Patented Feb. 13, 1962
ble water conduit 18. As is well known in the art, ?oat
17 will cause valve 16 to supply water to sump 15, as
David Earle MacLeod, Syracuse, N. Y., assignor to Car
rier Corporation, Syracuse, N.Y., a corporation of
A water inlet conduit 19 having a pump 20 therein
has one end thereof communicating with the water in
sump 15. The other end of conduit 19 is coupled to
Filed Sept. 12, 1957, Ser. No. 683,599
cover 12. A water outlet conduit 21 has one end thereof
2 Claims. (Cl. 62-138)
coupled to cover 12 of ice forming section 10 and the
This invention relates to automatic ice-making machines
other end thereof adapted to drain into sump 15. During
and more particularly to an improved control for initiat 10 the time that ice is being formed in chambers 11, water
ing the ice harvesting cycle thereof.
will be supplied to all of said chambers 11 by pump 20
There are ice making machines known having controls
and conduit 19. The water will rise upwardly in cham
which initiate harvesting of the ice machine in response
bers 11 and over?ow through conduit 21 back into
to the accumulation of ice in the ice making cells. A
sump 15.
machine of this type is disclosed in my previous United 15
Connected with water inlet conduit 19 is one end of
States Patent No. 2,775,098, granted December 25, 195 6,
water backup tube 22. It is to be noted that the upper
and assigned to the assignee of the present invention. In
most portion 23 of water backup tube 22 is higher than
this type of prior art machine, water to be frozen is sup
the highest point of outlet tube 21.
plied to the top of the ice making cells and drained from
When pump 20 is ?rst placed in operation, water will
the bottom thereof. As ice is formed in these cells, it 20 rise to the same level in both ice forming section 10 and
restricts the ?ow of water therethrough so that the water
in water over?ow tube 22. Once water starts ?owing
backs up and over?ows from the top of the cells. This
from ice forming section 10 through water outlet tube
‘over?owing water is conducted to a control which initiates
21, the water level in water backup tube 22 will drop so
a harvesting cycle. The accuracy of the above type of
that there is little or no water therein if the bottom of
control is dependent to a great extent on the rate at which 25 tube 21 is below the bottom of tube 22. However, it
water is supplied to the top of the cells and the rate
has been found that if the outlet end of outlet tube 21
at which this water drains through these cells. More
is terminated above the lower end of backup tube 22,
speci?cally, there is the possibility that harvesting could
then water will rise in the latter to the same level as the
be prematurely initiated if too much water is being sup
lower end of outlet tube 21.
plied so that it over?ows from the tops of these cells be 30
As ice forms in ice forming section 10, especially in
fore the ice is fully formed therein. On the other hand,
the narrowest portions 24 thereof, the ?ow of water
there is always the possibility that harvesting could be
initiated after the optimum freezing time has elapsed if
the water is being supplied very slowly and it continues
through ice forming chamber 10 will be obstructed. This
to drain through the cells long after the ice has formed 35 tion
to the desired extent. It is with the overcoming of the
cause pump 20 to produce an increased water pres
in water inlet conduit 19. The obstruction of sec
10 will cause an increased pressure in conduit 19
therefore cause water to rise in water backup con
foregoing shortcomings of the prior art that the present
duit 22 until it ?ows from the other end thereof. The
invention is concerned.
water ?owing out of backup conduit 22 is adapted to
One object of the present invention is to provide a
strike a control such as a thermostatic bulb 25 located
control which positively initiates an ice harvesting opera— 40 in well 26 which is in communication with tube 27 for
tion of an ice making machine in response to the accumu
leading this over?ow water back to sump 15. As soon
lation of ice in the ice forming chambers thereof and is
as bulb 25, which is connected by capilliary 28 to bel
not materially in?uenced by the rate at which water is
lows 29 (which in turn controls switch 30), is actuated
supplied to the ice forming cells.
by water from tube 22, it will cause the initiation of a
Another object of the present invention is to provide 45 defrost cycle, as explained in detail hereafter. However,
an ice making machine control which is simple in con
it must be noted that water will not ?ow upwardly
struction, efficient in operation and inexpensive to manu
through backup tube 22 until the ice has formed to a
facture. Other objects and attendant advantages of the
desired extent in ice forming chamber 10. 'As noted
present invention will readily be perceived hereafter.
above, the level to which water rises in the tube 22 prior
The present invention relates to an ice making machine 50 to the formation of ice in chambers 11 is determined by
and a control therefor and comprises an ice forming
the position of the lower end of Water outlet tube 21.
chamber means for refrigerating said chamber, a conduit
Thus, by positioning the lower end of Water outlet tube
for conveying water to said chamber, and means respon
21, as desired, the head of water required to cause water
sive to the increase in pressure of water in said conduit
to over?ow from backup tube 22 may be adjusted to meet
due to ice forming in said chamber to initiate an ice 55 any particular situation. It is to be observed that
harvesting operation. The present invention will be more
fully understood when the following portions of the
speci?cation are read in conjunction with the accompany
harvesting is initiated in response to the restriction of ice
forming in chamber 10 and is substantially independent
of the rate at which Water is supplied to this ice forming
section 10 by pump 20.
making machine embodying the control of the present 60 Ice forming section 10 is refrigerated by a conventional
refrigeration system which includes compressor 31,.con
invention; and
denser 32, an expansion member such as capillary 33, and
FIGURE 2 is a schematic wiring diagram of the elec
evaporator 34, which is in contact with ice forming sec
trical circuit of my improved control.
tion 10. A hot gas bypass line 35 having a solenoid ac
In FIGURE 1 is shown an ice making machine having
an ice making section 10 which has a plurality of ice 65 tuated valve 36 therein couples the compressor discharge
line directly to the evaporator 34 for harvesting the
forming chambers 11 therein. Chambers 11 are gen
formed ice cubes, as explained hereafter.
erally of the con?guration desired in an ice cube. A
The control circuit for the control of the present inven
cover 12 is adapted to be sealed in contact with the
tion is disclosed in FIGURE 2. Compressor 31 is cou
periphery of section 10 as at 13 and 14.
A sump 15 is provided having a ?oat valve 16 and 70 pled through master switch 37 across leads L1 and L2.
Also coupled across leads L1 and L2 through switch 30
?oat 17 therein. Float valve 16 is connected to a suita
ing drawings wherein:
FIGURE 1 is a schematic representation of an ice
and master switch 37 is a timer motor 38 (FIGURES 1
and 2).
It can thus be seen that as soon as bulb 25 is
affected by water ?owing from backup tube 22, switch 30
20 is energized, and gear motor 44 is de-energized so
that the machine can start another ice making operation.
Timer motor 38
It will also be noted that arms 4 and S4’ of switch 53
assume a dotted line position when switch 53 is actuated
is of the type which will operate for a predetermined time
and which has a plurality of cams (not shown) mounted
by the closed cover 12. It is to be noted that all of the
switches in FIGURE 2 assume their solid line positions
on a shaft, each of these cams being adapted to actuate
during the ice-making cycle and will assume their dotted
line position at various times during the ice-harvesting
will close to energize timer motor 38.
switches 39, 40, 42, and ‘43 during its operation in the
cycle, as explained in detail above.
following manner: As soon as timer motor 38 is ener
It will thus be seen that I have disclosed a defrost con
gized, switch 39 therein will close to maintain the timer 10
trol for an ice making machine which is simple in con
motor energized regardless of whether switch 30 opens in
struction and positive and e?icient in operation. Fur
response to fluctuations of conditions in the area of bulb
thermore, it will readily be seen that my present control
25. As soon as timer motor 38 begins operation, switch
overcomes the shortcomings of the prior art controls.
40 therein will close to energize solenoid 41 of solenoid
While I have described a preferred embodiment of my
operated valve 36 to cause hot gas to be supplied di 15
invention, I desire it to be understood that it may be
rectly to the evaporator 34 to start melting the ice free
otherwise embodied within the scope of the following
in ice forming section 10. Also as soon as timer motor
38 is energized, switch 42 will open to disrupt the ?ow of
I claim:
current to pump 20. After timer motor 38 has been in
1. In an ice making machine, the combination of a
operation for a predetermined time which is sui?cient to 20
plurality of ice forming chambers, cover means to seal
permit the hot gas in evaporator 34 to loosen the ice in
the ice forming chambers, a sump, an inlet conduit for
ice forming section 10, switch 43 is actuated to close
conveying water from the sump to said chambers, an out
a circuit to gear motor 44 (FIGURES 1 and 2) to cause
let conduit for conveying water from the chambers to
the latter to pull cover 12 away from ice forming sec
25 said sump, means for refrigerating the chambers to form
tion 10.
ice therein, means for heating the chambers to harvest
Cover 12 may have sleeves such as 45 a?ixed thereto
the formed ice, a water backup tube connected to the
which are adapted to slide on bars 46, which are rigidly
inlet conduit for conducting Water from the inlet conduit
affixed to the frame (not shown) of the machine. Gear
when the ?ow of water through the chambers is impeded
motor v44 has arm 47 a?ixed to the shaft thereof, this
arm being pinned to link 48 at 49. The rotation of arm 30 by the formation of ice, a predetermined increase in pres
sure of water in the inlet conduit during ice formation
47 will cause link 48 which is also connected to cover
causing water to flow through said backup tube, and
12 at 50 to pull cover 12 away from ice forming section
means responsive to the ?ow of water through said back
10. Gear motor 44 is of the type which will make one
up tube to initiate ice harvesting and move the cover
360° revolution and then stop. Thus, when arm 47 ap
proaches a position which is 180° away from the position 35 means away from the ice forming section.
2. In an ice making machine, the combination of an
shown in the drawing, cover 12 will be in its fully opened
ice forming section containing a plurality of ice forming
position. Prior to the start of rotation of gear motor
chambers therein, a cover member to seal the ice forming
44, sufficient heat will have been provided to the ice
section, means for moving the cover member away from
bodies in ice forming section 10 so that they will be
the ice forming section, a sump, an inlet conduit con
released therefrom, while still adhering to cover 12. As
nected to the cover member for conveying water from
arm 47 approaches its 180° position from start-up, cover
the sump to said chambers, means for refrigerating the
12, which is ?exible, is stretched by suitable pins (not
chambers to form ice therein, means for heating the
shown) and the ice bodies are loosened therefrom whence
chambers to release the formed ice, an outlet conduit
they fall onto a slide 51 which conducts them to a suitable
ice receiving receptacle 52. As link 47 continues its ro 45 connected to the cover member for carrying water from
the chambers to the sump, a water backup tube attached
tation to approach its position shown in FIGURE 1,
to the inlet conduit, means for forwarding water from
cover 12 will then start closing. The rate of rotation of
the sump through the inlet conduit, the chambers and
gear motor 44 is timed to permit complete release of ice .
the outlet conduit to the sump, said backup tube conduct
bodies from cover 12.
To insure proper operation of the foregoing cycle, an 50 ing water from the inlet conduit when ?ow of water
interlock switch 53 is provided (FIGURES 1 and 2)
through the chamber is impeded by the formation of ice,
which is adapted to close a circuit through solenoid 41
a predetermined increase in pressure of water in the inlet
conduit during ice formation causing water to flow
through said backup tube and means responsive to the
away from its closed position. It will thus be seen that,
in the event that ice jams between cover plate 12 and 55 ?ow of Water through said backup tube to initiate ice
harvesting and move the cover member away from the
ice forming section 10 before the former has reached its
ice forming section.
fully closed position and after timer motor 38 has stopped,
and gear motor 44 as soon as cover plate 12 is moved
solenoid 41 and gear motor 44- will remain energized to
cause the ice to melt and cover 12 to close, respectively.
It is not until cover 12 returns to its fully closed position 60
that switch 53 will open to permit gear motor 44 and
solenoid 41 to become de~energized. By the time that
gear motor 44 returns cover 12 to its fully closed posi
tion, timer motor 38 will have stopped and contacts 39,
40, 42 and 43 therein will have returned to their solid 65
line positions so that solenoid 41 is de-energized, pump
References Cited in the ?le of this patent
Grandia _____________ __ Apr. 22, 1952
Lauer _______________ __ Mar. 31, 1953
Hopkins ______________ __ Feb. 8, 1955
Lees ________________ __ Sept. 25, 1956
Watt ________________ __ Jan. 28, 1958
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