US20090282844A1 - Ice producing apparatus and method - Google Patents

Abstract

A method of producing ice in a refrigerator includes flowing a refrigerant through a cooling system to cool an interior compartment of the refrigerator, flowing a cooling medium different than the refrigerant through a first heat exchanger to decrease a temperature of the cooling medium, and flowing the cooling medium through a second heat exchanger to freeze water that is disposed in an ice mold adjacent the second heat exchanger.

Description

CROSS REFERENCE TO RELATED APPLICATIONS
• This application is a divisional of U.S. patent application Ser. No. 11/610,798, filed on Dec. 14, 2006, the entire disclosure of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
• The described technology relates to an ice producing apparatus, such as for a refrigerator, and more particularly such as for a refrigerator including a bottom freezer compartment disposed below a top fresh food compartment, and a corresponding method.
• In a known refrigerator, an ice maker delivers ice through an opening in a door of a refrigerator. Such a known refrigerator has a freezer section to the side of a fresh food section. This type of refrigerator is often referred to as a “side-by-side” refrigerator.
• In the side-by-side refrigerator, the ice maker delivers ice through the door of the freezer section. In this arrangement, ice is formed by freezing water with cold air in the freezer section, the air being made cold by a cooling system including an evaporator.
• Another known refrigerator includes a bottom freezer section disposed below a top fresh food section. This type of refrigerator is often referred to as a “bottom freezer” or “bottom mount freezer” refrigerator. In this arrangement, convenience necessitates that the ice maker deliver ice through the opening in the door of the fresh food section, rather than the freezer section. However, the cool air in the fresh food section is generally not cold enough to freeze water to form ice.
• In the bottom freezer refrigerator, it is known to pump cold air, which is cooled by the evaporator of the cooling system, within an interior of the door of the fresh food section to the ice maker. This arrangement suffers from numerous disadvantages, however. For example, complicated air ducts are required, within the interior of the door, for the cold air to flow to the ice maker. Further, ice is made at a relatively slow rate, due to limitations on a volume and/or temperature of cold air that can be pumped within the interior of the door of the fresh food section. Another disadvantage is that pumping the cold air from the freezer compartment, during ice production, reduces a temperature of the fresh food compartment below the set point.
BRIEF DESCRIPTION OF EMBODIMENTS OF THE INVENTION
• As described herein, embodiments of the invention overcome one or more of the above or other disadvantages known in the art.
• In an embodiment, an ice producing apparatus for a refrigerator includes a storage tank configured to store a cooling medium. A first heat exchanger is disposed downstream of the storage tank and is configured to have the cooling medium flow therethrough to be cooled. An ice mold includes at least one cavity that is configured to retain water therein. A second heat exchanger is disposed downstream of the first heat exchanger and is configured to have the cooling medium flow therethrough to freeze the water in the ice mold to produce ice.
• In another embodiment, a refrigerator includes a compartment cooling section configured to cool an interior compartment of the refrigerator, the compartment cooling section including a first heat exchanger configured to have a refrigerant flow therethrough to absorb heat. An ice producing apparatus is configured to produce ice and to deliver the produced ice through an opening in a door of the refrigerator. The ice producing apparatus includes a storage tank configured to store a cooling medium. A second heat exchanger is disposed downstream of the storage tank and is configured to have the cooling medium flow therethrough to be cooled. An ice mold includes at least one cavity that is configured to retain water therein. A third heat exchanger is disposed downstream of the second heat exchanger and is configured to have the cooling medium flow therethrough to freeze the water in the ice mold to produce ice.
• In yet another embodiment, method of producing ice in a refrigerator includes flowing a refrigerant through a cooling system to cool an interior compartment of the refrigerator, flowing a cooling medium different than the refrigerant through a first heat exchanger to decrease a temperature of the cooling medium, and flowing the cooling medium through a second heat exchanger to freeze water that is disposed in an ice mold adjacent the second heat exchanger.
BRIEF DESCRIPTION OF THE DRAWINGS
• The following figures illustrate examples of embodiments of the invention. The figures are described in detail below.
• FIG. 1 is a schematic view of a refrigerator including an ice producing apparatus.
• FIG. 2 is a side partial cross-sectional view of the refrigerator ofFIG. 1.
DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION
• Embodiments of the invention are described below, with reference to the figures. Throughout the figures, like reference numbers indicate the same or similar components.
• FIG. 1 is a schematic view of a refrigerator including an ice producing apparatus, andFIG. 2 is a side view of the refrigerator. As shown in the figures, therefrigerator100 includes a freezercompartment cooling system200 and anice producing apparatus500.
• The following explanation of the freezercompartment cooling system200 is understood to be exemplary, as therefrigerator100 that include theice producing apparatus500 can be used in conjunction with various systems that cool afreezer compartment101 and/or afresh food compartment103.
• In general, air in an interior of thefreezer compartment101 is made cold by the freezercompartment cooling system200, and in particular by afreezer compartment condenser203, afreezer compartment compressor205 and a freezercompartment heat exchanger210, in a known manner. Thefresh food compartment103 is cooled by controlling a flow of cool air from thefreezer compartment101 to thefresh food compartment103. Thefreezer compartment101 is cooled to a temperature equal to or less than a standard freezing point temperature of water (i.e., equal to or less than 0 degrees Celsius), being configured to store or have disposed in an interior thereof frozen foods and liquids. In contrast, thefresh food compartment103 is cooled to a temperature above the standard freezing point temperature of water, being configured to store or have disposed in an interior thereof fresh foods and liquids. Components of the freezercompartment cooling system200, including thefreezer compartment condenser203, thefreezer compartment compressor205 and the freezercompartment heat exchanger210, are known to those of ordinary skill in the art, and therefore further explanation is not required to provide a complete written description of embodiments of the invention or to enable those of ordinary skill in the art to make and use embodiments of the invention, and is not provided except with reference to theice producing apparatus500.
• Theice producing apparatus500 can be configured to produce ice, and to provide the produced ice through an opening in a door of thefresh food compartment103. It is contemplated that theice producing apparatus500 can be used with a bottom freezer refrigerator, in which the bottom freezer compartment is disposed below the top fresh food compartment. It is understood, however, that theice producing apparatus500 is not limited to use in the bottom freezer refrigerator. For example, theice producing apparatus500 can be configured to produce ice and to provide the produced ice through an opening in a door of a fresh food compartment of a side-by-side refrigerator in which the freezer compartment is disposed to the side of the fresh food compartment. Alternately, theice producing apparatus500 can be disposed in various refrigerators in which the fresh food and freezer compartments are disposed in a variety of positions relative to one another. It is further understood that the refrigerator in which theice producing apparatus500 is disposed is not required to have one or only one of each of the fresh food and freezer compartments, but rather can include none, or one or more of each of the fresh food and freezer compartments. By way of non-limiting examples, theice producing apparatus500 can be disposed in the refrigerator that includes one or more fresh food compartments and no freezer compartment, or that includes one or more freezer compartments and no fresh food compartment.
• Theice producing apparatus500 is provided in addition to the freezercompartment cooling system200, and produces and provides ice separate from operation of the freezercompartment cooling system200. By this arrangement, disadvantages associated with a known ice maker, particularly in a bottom freezer refrigerator, are overcome. Specifically, in embodiments of the invention, ice is produced at a relatively quicker rate because ice production is not dependent on a volume or temperature of cold air that can be pumped within an interior of the door of the fresh food compartment.
• As shown in the figures, theice producing apparatus500 includes amedium storage tank510 configured to hold a medium used to cool water to a temperature equal to or less than the standard freezing point temperature of water. The medium flows through theice producing apparatus500 in the following cyclical manner.
• Apump520 is configured to pump the medium from themedium storage tank510 to amedium path530 in a heat exchanger570 (e.g., an evaporator). In themedium path530, the medium is cooled through heat transfer, discussed in further detail below, to the temperature less than the standard freezing point temperature of water.
• The cooled medium flows through anice forming device540 configured to freeze water to produce ice. In the embodiments shown in the drawings, theice forming device540 includes anice mold541. Theice mold541 includes one or more cavities configured to receive water from an outside water source (e.g., from a water line), and to retain the water during freezing of the water, as described below.
• Theice forming device540 also includes aheat exchanger545 disposed adjacent (e.g., near or as a portion of) the cavities of theice mold541. It is contemplated that in embodiments of the invention, theheat exchanger545 is formed as one or more channels formed, cast, molded or otherwise provided in a bottom of theice mold541 and/or theice forming device540 while on a top of theice mold541, the top of theice mold541 and theice forming device540 being open to receive the water that is to be frozen to produce ice. By this arrangement, cooled medium flowing through theheat exchanger545 of theice forming device540 absorbs heat from a volume adjacent theheat exchanger545. As discussed above, the cooled medium cools the water retained in the cavities to the temperature equal to or less than the standard freezing point temperature of water. As a result, the water retained in the cavities of theice mold541 freezes, producing ice. The ice produced in the cavities of theice mold541 is often referred to as “ice cubes,” although the ice can be of various shapes.
• Anice receptacle550 is configured to receive ice from theice forming device540, and to retain ice therein. Features of theice receptacle550 are known to those of ordinary skill in the art, and therefore further explanation is not required to provide a complete written description of embodiments of the invention or to enable those of ordinary skill in the art to make and use embodiments of the invention, and is not provided. Similarly, details of an ice delivery system configured to deliver ice from theice forming device540 to theice receptacle550, whether separate from or a component of theice forming device540 and/or theice receptacle550, are also known, and are therefore neither required nor provided. Still further, details of an ice delivery system configured to deliver ice from theice receptacle550 through the opening in the door of thefresh food compartment103 are known.
• In embodiments of the invention shown in the drawings, aheat exchanger560 is disposed adjacent theice receptacle550, with the medium flowing through theheat exchanger560 subsequent to flowing through theheat exchanger545 of theice forming device540. Thus, the medium that has been warmed during the production of ice is further warmed, absorbing heat from a volume adjacent theice receptacle550. As a result, melting of ice retained within theice receptacle550 is impeded or prevented. In embodiments of the invention, it is contemplated that the temperature of the warmed medium flowing through theheat exchanger560 is still less than the standard freezing point temperature of water, such that melting of ice in theice receptacle550 is prevented. It is to be understood, however, that theheat exchanger560 is not required in theice producing apparatus500, and that in alternate embodiments the melting of ice retained within theice receptacle550 is impeded or prevented without the use of theheat exchanger560. In such alternate embodiments, theice receptacle550 is disposed adjacent theice forming device540 and/or theheat exchanger545. As a result, ice in the ice receptacle is prevented from melting as a result of cooling by theheat exchanger545. For example, when theice receptacle550 is disposed below theice forming device540 and theheat exchanger545, cold air flows from theheat exchanger545 to theice receptacle550 as a result of natural convention.
• The warmed medium flows back to themedium storage tank510. Continued operation of theice producing apparatus500 is provided by repetition of the above-described flow of the medium through themedium path530 andheat exchangers545 and560, among the other components of theice producing apparatus500.
• In embodiments of the invention, the above-describedmedium path530, in which the medium is cooled before subsequent ice production and cooling of the produced ice by theice producing apparatus500, operates in conjunction with arefrigerant coil220 of the freezercompartment cooling system200. Specifically, refrigerant flows through therefrigerant coil220, while the medium flows through themedium path530. The refrigerant in therefrigerant coil220 absorbs heat from the medium flowing in themedium path530, the liquid refrigerant at least partially evaporating from a liquid to a gas while flowing through therefrigerant coil220. As a result of the refrigerant absorbing heat from the medium, the temperature of the medium is decreased, such that the medium is able to cool the water in theice forming device540 to the temperature equal to or less than the standard freezing point temperature of water, in the manner discussed above. By this arrangement, the refrigerant and the cooling medium are disposed in separate, adjacent paths of the evaporator of the freezercompartment cooling system200, referred to as aheat exchanger570.
• In embodiments of the invention, the refrigerant has an evaporation temperature of less than about 0 degrees Celsius. Further, in embodiments of the invention, the medium is propylene glycol and water, commonly referred to as “anti-freeze,” and is cooled to a temperature well below the standard freezing point temperature of water when flowing through themedium path530.
• In embodiments of the invention shown in the drawings, themedium path530 and theheat exchangers545 and560 are disposed downstream from one another, respectively, without intervening heat exchangers disposed therebetween. It is understood, however, that this efficient arrangement is not required, and intervening heat exchangers may be included. Further, theheat exchanger560 is not required to be disposed downstream of theheat exchanger545, and theheat exchanger560 can be disposed upstream of theheat exchanger545. Similarly, themedium storage tank510 and/or thepump520 can be disposed at various locations within theice producing apparatus500, and therefore the depicted and described locations are understood not to limit the locations of these components.
• Components of theice producing apparatus500 also can be disposed in various locations within therefrigerator100, and are not limited to those exemplary locations depicted in the drawings. It is contemplated that in embodiments of the invention thestorage tank510, thepump520 and/or themedium path530 are disposed next to a back wall of thefreezer compartment101 and behind a freezer evaporator cover. The medium is cooled by the absorption of heat by the refrigerant undergoing expansion, in the manner described above. However, these components are not limited to such locations within therefrigerator100.
• This written description uses examples to disclose embodiments of the invention, including the best mode, and also to enable a person of ordinary skill in the art to make and use embodiments of the invention. It is understood that the patentable scope of embodiments of the invention is defined by the claims, and can include additional components occurring to those skilled in the art. Such other arrangements are understood to be within the scope of the claims.

Claims (8)

1. A method of producing ice in a refrigerator, comprising:

flowing a refrigerant through a cooling system to cool an interior compartment of the refrigerator;

flowing a cooling medium different than the refrigerant through a first heat exchanger to decrease a temperature of the cooling medium; and

flowing the cooling medium through a second heat exchanger to freeze water that is disposed in an ice mold adjacent the second heat exchanger.

2. The method ofclaim 1, wherein flowing the cooling medium through the first heat exchanger comprises decreasing the temperature of the cooling medium to a temperature below a freezing point temperature of water.

3. The method ofclaim 1, wherein flowing the cooling medium through the first heat exchanger comprises decreasing the temperature of the cooling medium to a temperature below a freezing point temperature of water, and wherein the second heat exchanger is downstream of the first heat exchanger without an intervening heat exchanger therebetween.

4. The method ofclaim 1, wherein flowing the cooling medium through the first heat exchanger comprises absorbing heat from the cooling medium.

5. The method ofclaim 1, wherein flowing the cooling medium through the first heat exchanger comprises absorbing heat from the cooling medium by the refrigerant.

6. The method ofclaim 5, wherein the cooling medium comprises propylene glycol.

7. The method ofclaim 1, wherein flowing the cooling medium through the first heat exchanger comprises decreasing the temperature of the cooling medium to a temperature below a freezing point temperature of water through absorption of heat by the refrigerant, and wherein the second heat exchanger is downstream of the first heat exchanger.

8. The method ofclaim 1, further comprising:

flowing the cooling medium through a third heat exchanger to cool ice received in an ice receptacle from the ice mold.

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