Water cooler abstract
A water cooler having a container with a reservoir for storing
water has a thermoelectric module operable to cool a conductor plate
and form ice in the reservoir. A temperature sensor connected to
the plate senses the temperature of the plate and activates a timer
when the temperature is below the temperature at which water freezes.
The timer operates a selected period of time to allow a block of
ice to be formed on the plate. A photoelectric sensor operable to
sense a selected size of the block of ice functions to actuate a
switching device that changes the polarity of the electric power
supplied to the thermoelectric module to supply heat energy to the
plate to release the block of ice from the plate. The released block
of ice floats in the water in the reservoir and cools the water.
Water cooler claims
I claim:
1. A water cooler for producing ice to cool water comprising: a
container having a side wall and bottom wall providing a reservoir
for storing water, a cup-shaped member mounted on the bottom wall,
said cup-shaped member having a bottom wall and an upper end open
to the reservoir whereby the cup-shaped member accommodates water,
a heat conducting member mounted on the bottom wall of the cup-shaped
member, said heat conducting member having a top surface exposed
to the water in the cup-shaped member and a bottom surface spaced
from the top surface, a thermoelectric module having a first surface
located in engagement with the bottom surface of the heat conducting
member and a second surface spaced from the first surface, control
means operably connected to the thermoelectric module for reversing
the polarity of electric power supplied to the thermoelectric module
whereby when a first polarity of electric power is supplied to the
thermoelectric module the first surface is cooled, thereby cooling
the heat conducting member to form ice adjacent the top surface
of the heat conducting member and when a second polarity opposite
the first polarity is supplied to the thermoelectric module the
first surface is heated thereby heating the heat conducting member
to melt ice adjacent the top surface of the heat conducting member
to allow the remaining ice to float in the water in the reservoir,
said control means including means for sensing the temperature of
the heat conducting member and causing a signal when the heat conducting
member has attained a selected temperature for forming ice, timer
means responsive to said signal causing the electric power supplied
to the thermoelectric modules to have a first polarity for a selected
period of time whereby a block of ice is produced adjacent the top
surface of the heat conducting member said timer means being operable
after a selected period of time to change the polarity of the electric
power to the second polarity thereby heating the heat conducting
member to partly melt the ice adjacent the heat conducting member
allowing the remaining ice to float in the water in the reservoir
and cool the water in the reservoir, sensing means for sensing the
size of the block of ice formed on the heat conducting member, said
sensing means including a photo optical sensor mounted on the cup-shaped
member for generating a light beam located above the heat conducting
member and projected across the water in the cup-shaped member,
said light beam being broken by a block of ice of a selected size,
said control means including means responsive to the broken light
beam to change the polarity of the electric power to the second
polarity prior to the selected period of time established by the
timer means thereby heating the heat conducting member allowing
the remaining ice to float in the water in the reservoir and cool
the water in the reservoir.
2. The water cooler of claim 1 including a heat sink located adjacent
the second surface of the thermoelectric module.
3. The water cooler of claim 1 wherein: the means for sensing the
temperature of the heat conducting member includes a thermocouple
mounted on the heat conducting member, said thermocouple being operable
to cause said signal when the heat conducting member is at a temperature
that is below the freezing temperature of water.
4. A water cooler for producing ice to cool water comprising: a
container having a reservoir for storing water, means mounted on
the container for removing water from the reservoir, a thermoelectric
module having a first surface and a second surface, plate means
of heat conductive material mounted on the container for transferring
heat energy between the water in the reservoir and the first surface
of the thermoelectric module, said plate means having a top surface
in communication with the bottom of the reservoir and the water
therein and a bottom surface located in engagement with the first
surface of the thermoelectric module, a heat sink located adjacent
the second surface of the thermoelectric module for transferring
heat to the surrounding environment, control means connecting the
thermoelectric module to a source of electric power having a first
and second polarity whereby the thermoelectric module cools the
plate means when connected to the source of electric power having
the first polarity thereby causing a block of ice to form adjacent
the surface of the plate means, means for sensing the temperature
of the plate means and causing a signal when the plate means has
attained a selected temperature for forming ice, timer means responsive
to said signal for maintaining the supply of electric power having
said first polarity to the thermoelectric module for a selected
period of time whereby a block of ice is formed adjacent the plate
means, said timer means being operable after the selected period
of time to change the polarity of the electric power from the first
polarity to the second polarity whereby heat energy is transferred
from the thermoelectric module to the plate means causing a part
of the block of ice to melt adjacent the plate means so that the
remaining block of ice floats in the water in the reservoir, sensing
means located above the plate means for detecting the presence of
the block of the ice when the block of ice reaches a selected size,
and control means for reversing the polarity of the electric power
from the first polarity to the second polarity to the thermoelectric
module prior to the end of the selected period of time of the timer
means when the sensing means detects the presence of the selected
size of the block of ice whereby heat energy is transferred to the
plate means causing a part of said block of ice to melt adjacent
the plate means thereby allowing the remaining block of ice to float
in the water in said reservoir and cool the water.
5. The water cooler of claim 4 wherein: the plate means is a metal
member, said means for sensing the temperature of the plate means
being mounted on the metal member.
6. The water cooler of claim 5 wherein: the means for sensing the
temperature of the plate means includes a thermocouple mounted on
the metal member, said thermocouple being operable to cause said
signal when the metal member is at a temperature that is below the
freezing temperature of water.
7. The water cooler of claim 4 wherein: the sensing means is a
photo optical sensor generating a light beam above the plate means,
said light beam being broken by the selected size of the block of
ice, and said control means being responsive to said broken light
beam to reverse the polarity of the electric power to the thermoelectric
module from the first polarity to the second polarity and change
the polarity of the electric power from the second polarity to the
first polarity when the light beam is continuous.
8. The water cooler of claim 4 including: a cup member located
at the bottom of the reservoir having a pocket for accommodating
water, said plate means being located in the bottom of the cup member
whereby ice is formed in said pocket, said means for sensing the
temperature of the plate means being connected to the plate means,
and said sensing means for detecting the presence of the block of
ice being operable to detect the level of ice formed in said pocket.
9. The water cooler of claim 8 wherein: the means for sensing the
temperature of the plate means includes a thermocouple being operable
to cause said signal when the plate means is at a temperature that
is below the freezing temperature of the water.
10. A method of cooling water in a container having a reservoir
for storing water with a thermoelectric module located adjacent
a member for conducting heat energy between the water in the reservoir
and the thermoelectric module comprising: storing water in the reservoir,
cooling the member with the thermoelectric module by supplying electric
power having a first polarity to the thermoelectric module, sensing
the temperature of the member, maintaining the supply of electric
power having the first polarity to the thermoelectric module to
maintain the sensed temperature of the member at a temperature below
the temperature at which water freezes for a selected period of
time to form a block of ice adjacent the member from the water in
the reservoir, sensing the size of the block of ice in the reservoir
formed adjacent the member, reversing the polarity of the electric
power supplied to the thermoelectric module to a second polarity
when a selected size of the block of ice is sensed before the end
of the selected period of time that the supply of electric power
is maintained having the first polarity to the thermoelectric modular
thereby causing the thermoelectric module to heat the member to
a temperature that melts a portion of the block of ice adjacent
the member so as to allow the remaining block of ice to float in
the water in the reservoir, and changing the polarity of the electric
power supplied to the thermoelectric module from the second polarity
back to the first polarity when a block of ice is not sensed in
the reservoir whereby the thermoelectric module operates to cool
the member to form another block of ice.
11. The method of claim 10 wherein: the supply of electric power
having the first polarity to the thermoelectric module is commenced
for the selected period of time when the sensed temperature is at
least minus 8 degrees C.
12. The method of claim 11 wherein: the electric power supplied
to the thermoelectric module is maintained for at least 40 minutes.
13. The method of claim 10 wherein: the maintaining of the electric
power supply having the first polarity to the thermoelectric module
is achieved with a timer which commences operation for the selected
period of time in response to sensed temperatures below the temperature
at which water freezes.
14. The method of claim 10 wherein: the sensing of the temperature
of the member is accomplished with a temperature sensing device
secured to the member.
15. The method of claim 10 wherein: the maintaining of the electric
power supply having the first polarity of the thermoelectric module
is achieved with a timer which commences operation for the selected
period of time in response to a sensed temperature which is below
the temperature at which water freezes, and the sensing of the temperature
of the member is accomplished with a temperature sensing device.
16. The water cooler of claim 4 wherein: the means for sensing
the temperature of the plate means is set to sense a temperature
of about minus 8 degrees C on the plate means.
17. A water cooler comprising: a container having a reservoir for
storing water, heat conductor means mounted on the container having
a first surface in contact with the water located in the reservoir
and a second surface spaced from the first surface, a thermoelectric
module engageable with the second surface for selectively cooling
and heating the heat conductor means to form ice adjacent the first
surface of the thermoelectric module and melt part of the ice adjacent
the first surface of the thermoelectric to allow the remaining ice
to float in the water in the reservoir, control means connecting
the thermoelectric module to a source of electric power having a
first and second polarity whereby the thermoelectric module cools
the heat conductor means when the electric power has the first polarity,
timer means for maintaining the supply of electric power having
said first polarity to the thermoelectric module for a selected
period of time whereby a block of ice is formed adjacent the first
surface of the heat conductor means, said timer means being operable
after the selected period of time to change the polarity of the
electric power from the first polarity to the second polarity whereby
heat energy is transferred from the thermoelectric module to the
heat conductor means causing part of the block of ice to melt adjacent
the first surface of the heat conductor means so that the remaining
block of ice floats in the water in the reservoir, sensing means
spaced from the conductor means for detecting the presence of the
block of ice when the block of ice reaches a selected size, and
control means for reversing the polarity of the electric power from
the first polarity to the second polarity to the thermoelectric
module prior to the end of the selected period of time of the timer
means when the sensing means detects the presence of the selected
size of the block of ice whereby heat energy is transferred to the
heat conductor means causing a part of said block of ice to melt
adjacent the heat conductor means thereby allowing the remaining
block of ice to float in the water in said reservoir and cool the
water.
18. The water cooler of claim 17 including: means for sensing the
temperature of the heat conductor means and causing a signal when
the heat conductor means has attained a selected temperature for
forming ice adjacent the heat conductor means, said signal being
operable to actuate the timer means to connect the source of electric
power having the first polarity to the thermoelectric module thereby
commencing the selected period of time of operation of the timer
means.
19. The water cooler of claim 18 wherein: the means for sensing
the temperature of the heat conductor means is set to sense a temperature
of about minus 8 degrees C on the heat conductor means.
20. The water cooler of claim 18 wherein: the means for sensing
the temperature of the heat conductor means includes a thermocouple
mounted on the heat conductor means, said thermocouple being operable
to cause said signal when the heat conductor means is at a temperature
that is below the freezing temperature of water.
21. The water cooler of claim 17 wherein: the sensing means is
a photo optical sensor generating a light beam spaced from the heat
conductor means, said light beam being broken by the selected size
of the block of ice, and said control means being responsive to
said broken light beam to reverse the polarity of the electric power
to the thermoelectric module from the first polarity to the second
polarity and change the polarity of the electric power from the
second polarity to the first polarity when the light beam is continuous.
22. The water cooler of claim 17 including: a cup member located
at the bottom of the reservoir having a pocket for accommodating
water, said heat conductor means being located in the bottom of
the cup member whereby ice is formed in said pocket, and said sensing
means for detecting the presence of the block of ice being operable
to detect the level of the block of ice formed in said pocket.
Water cooler description
FIELD OF THE INVENTION
This invention relates to thermoelectric water coolers operable
to provide a source of cold drinking water. More particularly, the
water cooler has a thermoelectric module operable to form ice used
to cool water stored in a reservoir.
BACKGROUND OF THE INVENTION
Water coolers are known utilizing thermoelectric modules to freeze
water in contact therewith to form ice in containers and using the
ice to cool the remaining water in the containers. Usually the containers
have a water supply connected thereto either from replenishable
bottles or a water supply.
Examples of water coolers having thermoelectric modules to cool
drinking water are disclosed by M. Alex in U.S. Pat. No. 3088289
and T. M. Elfving in U.S. Pat. No. 4055053. Elfving's cooler produces
ice which is intermittently released from the thermoelectric module
into a water reservoir. The energy stored in the ice cools the water
while more ice is formed by the thermoelectric module.
C. P. West and D. B. Neuwen describe in International Publication
No. WO 93/08432 a water cooling system having a thermoelectric
module to form ice used to cool water in a reservoir. A photo-optic
sensing device is used to determine when ice produced on the thermoelectric
module has a predetermined mass large enough to be released into
the reservoir. The sensing device generates a light beam over the
thermoelectric module. As the ice grows on the thermoelectric module,
the light beam is broken, which causes the electric power supply
to be turned OFF. Heat is allowed to flow from a heat sink through
the thermoelectric module to defrost a part of the ice immediately
adjacent the thermoelectric module. This allows the ice to float
towards the surface of the water in the reservoir. As soon as the
ice moves out of the light beam, the electric power is again supplied
to the thermoelectric module to begin generation of the next mass
of ice.
SUMMARY OF THE INVENTION
The invention is a water cooler for producing ice to cool water
which is efficient in use and easy to maintain. The water cooler
has a reservoir for storing water. An ice producing device is mounted
on the container and is operable to selectively form ice and melt
the ice to allow the ice to float in the water and thereby cool
the water. The operation of the water cooler is controlled with
the use of a temperature sensor for sensing the temperature of the
ice producing device and causing a signal when the ice producing
device has attained a selected temperature for forming ice. A timer
responsive to the signal of the sensor causes the ice producing
device to function for a selected period of time whereby a mass
of ice grows on the ice producing device. A mass of ice is released
from the ice producing device and allowed to float in the water
in the reservoir thereby cooling the water.
A further feature of the water cooler is the use of a sensor for
determining the presence of ice on the ice producing device to control
the operation of the ice producing device to melt a portion of the
ice to allow the ice to float in the water in the reservoir.
The preferred embodiment of the water cooler has a container with
a reservoir for storing water. A valve attached to the container
is used to withdraw water from the reservoir into a glass or cup.
A thermoelectric module having a cool surface and a hot surface
is located in a base below the container. A heat conductor, such
as a plate, is mounted on the container for transferring heat energy
between the water in the reservoir and the thermoelectric module.
The heat conductor has a first surface in communication with the
bottom of the reservoir and the water therein and a second surface
located in engagement with the cold surface of the thermoelectric
module. A heat sink, located below the thermoelectric module and
adjacent the hot surface thereof, transfers heat from the thermoelectric
module to the surrounding environment. The dissipation of the heat
is facilitated by a motor driven fan which moves air across the
heat sink. The thermoelectric module is connected to a source of
electric power with a control. The temperature of the heat conductor
is sensed with a thermocouple or other device which causes a signal
when the heat conductor has attained a selected temperature sufficient
to form ice, for example, about minus 8 degrees C. A timer responsive
to the sensed temperature signal maintains a supply of electric
power to the thermoelectric module for a selected period of time,
for example, 40 minutes, to allow a mass of ice to form on the conductor.
A photoelectric sensor is located above the conductor for detecting
the presence of a mass of ice when the mass of ice reaches a selected
size. A control reverses the polarity of the electric power of the
thermoelectric module when the sensor detects the presence of the
selected size of the mass of ice whereby heat energy is transferred
to the conductor causing a part of the mass of ice to melt adjacent
the conductor. This allows the remaining mass of ice to float in
the water and the reservoir and cool the water.
The invention includes a method of cooling water with ice in a
container having a reservoir for storing water. The ice is formed
by the operation of a thermoelectric module or component located
adjacent a member for conducting heat energy between the water in
the reservoir and the thermoelectric module. The thermoelectric
module operates in response to electric power having opposite polarities
which are selectively applied to the thermoelectric module. The
member is cooled by the thermoelectric module energized with electric
power having a first polarity. The temperature of the member is
sensed with a temperature sensing device which records when the
temperature is below the temperature at which water freezes, for
example, minus 8 degrees C. The supply of electric power having
the first polarity to the thermoelectric module to maintain the
sensed temperature of the member at the temperature below the temperature
at which water freezes for a selected period of time, for example,
40 minutes, to form a block of ice adjacent the member from the
water in the reservoir. A timer, responsive to the temperature sensing
device, operates to provide the selected period of time that the
electric power is supplied to the thermoelectric module. When a
selected size of the block of ice formed adjacent the plate is sensed
with a photo optical sensor, the polarity of the electric power
to the thermoelectric module is reversed to a second polarity thereby
causing the thermoelectric module to heat the member to a temperature
that melts a portion of the ice adjacent the member. This allows
the remaining block of ice to free itself from the member and float
in the water in the reservoir to cool the water. The polarity of
the electric power supplied to the thermoelectric module is changed
from the second polarity back to the first polarity when the block
of ice is not sensed in the reservoir whereby the thermoelectric
module operates to cool the member to form another block of ice.
DESCRIPTION OF DRAWING
FIG. 1 is a front elevational view of a water cooler of the invention
supporting an inverted bottle having a supply of water;
FIG. 2 is a view partly sectioned, taken along the line 2--2 of
FIG. 1; and
FIG. 3 is a logic diagram of the electric control system for the
water cooler.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENT
Referring to FIG. 1 there is shown the water cooler, indicated
generally at 1 of the invention operable to provide a source of
cool drinking water for human consumption. Water cooler 1 is retained
in an upright position on a support 2 such as a table or counter.
Cooler 1 has a generally cylindrical container 3 having an internal
chamber or water reservoir 17 for storing a supply of water. An
annular top 19 mounted on top of container 3 has a ring 21 supporting
an inverted bottle 4 having a supply of water in communication with
the water in reservoir 17. Bottle 4 is a conventional water storage
bottle having a neck 24 with an opening to allow water to flow out
of the bottle. Top 19 can be removed from container 3 to permit
cleaning of the inside of container 3.
Referring to FIG. 2 container 3 has a cylindrical outer wall 14
surrounding an inner cylindrical wall 16. A core 18 of temperature
insulation material, such as foam polystyrene, is interposed between
walls 14 and 16 to maintain the cool temperature of the water in
reservoir 17. Other types of wall structures can be used for container
3. Wall 16 surrounds reservoir 17. Top 19 is supported on the top
of container 3. Top 19 has a cup-shaped member 22 that projects
downwardly into reservoir 17 and surrounds a chamber 23 accommodating
neck 24 of bottle 4. Member 22 has at least one passage 26 to allow
water to flow from chamber 23 into reservoir 17.
Member 22 is an ice dispensing structure which aids in dispensing
the blocks of ice 45 floating in the water in reservoir 17. Member
22 also prevents the ice blocks from flowing into bottle 4 or blocking
the opening in neck 24 of bottle 4. A manually-operated valve 7
mounted on container 3 is open to reservoir 17 to allow a person
to operate valve 7 and obtain cool water from reservoir 17. When
the level of the water drops below the bottom of neck 24 air will
flow up into bottle 4 and allow water to flow from bottle 4 into
chamber 23. The water will continue to flow into chamber 23 and
reservoir 17 until the level of the water is above the bottom of
neck 24.
An annular bottom wall 27 joined to the lower portion of side wall
16 supports and upwardly-open cup member 28 forming a pocket 29.
The bottom of pocket 29 is closed with a heat conductor or metal
plate 6 such as an aluminum plate or other heat conducting materials.
Plate 6 has a downwardly-directed cone-shaped top surface providing
the bottom of product 29 which is exposed to the water in pocket
29. The bottom of plate 6 has a flat bottom surface in contact with
a thermoelectric module 5. Module 5 is an ice producing device comprising
semiconductor structure having opposite hot and cold sides or surfaces
when coupled to an electric power source. The hot and cold temperature
characteristics of the opposite surfaces alternate with the polarity
of the electric power applied to module 5 is reversed. The thermoelectric
module 5 is a common electrical component in the art of cooling
water and air. The lower surface of module 5 is located in contact
with a heat sink, indicated generally at 31 for transferring heat
from module 5 to the surrounding environment. Heat sink 31 has a
plurality of downwardly-directed fins 33 located above a rotatable
fan 33. An electric motor 34 is operable to rotate fan 33 to circulate
air through fins 32 to dissipate the heat conducted to fins 35 to
the air moved by fan 33. Motor 34 is supported on a horizontal plate
36. A plurality of upwardly-directed posts or rods 37 support the
heat sink 31 on plate 36.
A photo-optical device 11 mounted on one side of cup member 28
is operable to generate a light beam 38 toward a sensor 39 located
on opposite sides of cup member 28. The photo-optical device 11
in conjunction with sensor 39 is operable to sense the level of
ice in pocket 29. When the ice breaks the light beam 38 the control
circuit as hereinafter described, functions to reverse the plurality
of electrical power through thermoelectric module 5 thereby heating
plate 6 which in turn will melt part of the ice to release the
ice from pocket 29. Ice, indicated at ice 45 floats to the upper
portion of reservoir 17 and cools the water.
Referring to FIG. 3 there is shown a logic diagram for a control
circuit or controller 42 which automatically regulates the operation
of the water cooler 1. Controller 42 is mounted on a circuit board
12 located within base 13. Electric cord or cable 8 is used to connect
controller 42 with a source of electric power, such as the conventional
110 volt A.C. power. Electric power is supplied from an external
source via cord 8 to thermoelectric module 5. A temperature sensor
9 mounted directly on plate 6 as seen in FIG. 2 is operable to
record a predetermined temperature, usually at about minus 8 degrees
C. Sensor 9 is a thermocouple threaded into a blind hole in plate
6. Sensor 9 can be secured to the side or bottom of plate 6 or attached
to structure adjacent plate 6. Other types of temperature sensing
devices, such as bimetal switches, can be used in association with
plate 6 to sense the temperature of plate 6 and provide a signal
for actuating the timer 10. When plate 6 has reached the predetermined
temperature, the temperature sensor 9 causes a signal to initiate
operation of timer 10. Timer 10 is an electric component located
on circuit board 12 used to actuate electric power switching component
or device 43 to reverse the polarity of the electric power supplied
to thermoelectric module 5. The timer 10 is operable for a specific
period of time, for example, 40 minutes. At the end of a predetermined
time, a block or mass of ice will be formed on top of plate 6 in
pocket 29. The end of the time period is used to initiate a switching
device 43 to reverse the polarity of the electrical supply to thermoelectric
module 5. The reversing of the polarity of the electrical supply
to thermoelectric module 5 causes plate 6 to heat up plate 6 and
thereby melt a layer of ice on plate 6 which will release the block
of ice from the top of plate 6. The ice 44 will flow to the top
of reservoir 17 and cool the water. The floating block of ice are
shown at 45 in FIG. 2.
The photo-optical sensor 11 generates a light beam 38 which senses
the presence of a mass of ice 44 having a selected size in pocket
29 when the light beam is broken or prevented from actuating sensor
39. The photo-optical sensor 11 is energized on the reversal of
the plurality of the electrical power supply to thermoelectric module
5 when the ice block 44 flats away from plate 6 and will only provide
an output signal when there is no ice present in pocket 29 and when
the level of the ice is below light beam 38. A signal from the photo
optical sensor 11 39 is used to reset the circuitry back to its
original state with the power supplied to cool plate 6 whereby a
second mass of ice is formed on plate 6. Photo-optical sensor 11
19 and timing device 10 determine the size of the ice block which
is allowed to form on plate 6. Other types of sensors, including,
but not limited to, sonic wave sensors, can be used to determine
the size of the ice block.
The use of the photo-optical sensor 11 39 will prevent too much
ice collecting in reservoir 17 and prevent release of ice block
44 from plate 6. Should the ice pack in reservoir 17 prevent the
newest ice block from floating away from plate 6 the power will
remain in the condition causing heating of plate 6 until it is switched
off after a predetermined time. When sufficient ice has been melted
or has been removed from reservoir 17 the photo-optical sensor
11 39 to reset the circuitry for normal operation of water cooler
1.
The water cooler may be modified from the specific example shown
without departing from the scope of the invention. The control circuits
can be modified and the ice sensor may be of any convenient kind.
The water cooler may be made so that a mixture of cold and supply
water is dispensed. Various alterations, modifications and changes
in the materials, structures and arrangement of structure may be
made in the preferred embodiment herein described without departing
from the scope of the invention as defined in the following claims.
|