Patent Application
20060156755
This invention relates generally to methods and apparatus for operating a refrigerator, and more particularly, to methods and apparatus for operating a refrigerator having a chiller compartment.
A typical household refrigerator includes a freezer storage compartment and a fresh food storage compartment either arranged side-by-side or separated by a center mullion wall or over-and-under and separated by a horizontal center mullion wall. Shelves and drawers typically are provided in the fresh food compartment, and shelves and wire baskets typically are provided in the freezer compartment. In addition, an ice maker may be provided in the freezer compartment. A freezer door and a fresh food door close the access openings to the freezer and fresh food compartments, respectively.
Known refrigerators typically require extended periods of time to cool food and beverages placed therein. For example, it typically takes about four hours to cool a six pack of soda to a temperature of about 45° Fahrenheit (“F”). Beverages, such as soda, are often desired to be chilled in much less time than several hours. Thus, occasionally these items are placed in a freezer compartment for rapid cooling. If not closely monitored, the items will freeze and possibly break the packaging enclosing the item and creating a mess in the freezer compartment.
Numerous quick chill and super cool compartments located in refrigerator fresh food storage compartments and freezer compartments have been proposed to more rapidly chill and/or maintain food and beverage items at desired controlled temperatures for long term storage. Conventional compartments generally have duct systems attracting cold air from the freezer compartments, and utilize an existing freezer fan to channel cold air into the compartments. As a result, food or beverage items placed in chill compartments are susceptible to undesirable freezing if too much cold air is drawn from the freezer compartment into the chill compartment. Moreover, the duct systems may become frozen if moist air is input into the duct system and then cooled. In addition, conventional chill compartments may undesirably reduce refrigerator compartment space.
Accordingly, it would be desirable to provide a refrigerator having a quick chill compartment located within the fresh food compartment wherein the quick chill compartment maintains a colder temperature than the fresh food compartment and the quick chill compartment is always above freezing.
In one aspect, a method for operating a refrigerator including a fresh food compartment and a door is provided. The method includes providing a fresh food evaporator to produce cool airflow for the fresh food compartment, providing a chiller compartment within the fresh food compartment, providing a duct member in flow communication with the fresh food evaporator and the chiller compartment, and channeling cool airflow to the chiller compartment via the duct member.
In another aspect, a refrigerator is provided including a fresh food compartment, and a fresh food evaporator in flow communication with the fresh food compartment and producing cool airflow therein. The refrigerator also includes a chiller compartment positioned within the fresh food compartment, and a duct member configured to transmit cool airflow from the fresh food evaporator into the chiller compartment.
In yet another aspect, a chiller compartment is provided for use with a refrigerator including a fresh food compartment, and a fresh food evaporator. The chiller compartment includes an enclosure defining a cavity configured to receive refrigerated items therein, and an inlet extending through the enclosure. The inlet is configured to receive cooling air from the fresh food evaporator such that the chiller compartment operates at a temperature below the operating temperature in the fresh food compartment.
In a further aspect, a chiller compartment assembly is provided for use with a refrigerator including a refrigerator door having an inner liner, a fresh food compartment, and a fresh food evaporator. The chiller compartment assembly includes an enclosure defining a cavity configured to receive refrigerated items therein. The chiller compartment assembly also includes at least one positioning element extending from an exterior surface of the enclosure, and a door insert configured to be coupled to the inner liner of the refrigerator door. The door insert includes at least one shoulder extending from an interior surface of the door insert, and the shoulder is configured to engage the positioning element.
In the exemplary embodiment, a temperature control 118 is positioned within FF compartment 102 for setting a desired temperature for the FF compartment 102 and/or the FZ compartment 104. Additionally, a temperature sensor 116 is positioned within FF compartment 102 for determining the temperature of the air within FF compartment 102. In one embodiment, temperature sensor 116 is a resistance temperature detector (RTD) to detect the temperature of FF compartment 102, and to ensure that the temperature in FF compartment 102 remains within predetermined limits, such as, but not limited to, a set range of, for example, within approximately 5-10° F. of the set temperature. In the exemplary embodiment, temperature sensor 116 is operatively coupled to a controller (not shown), such as, for example, a microprocessor, for controlling the temperature of FF compartment.
Refrigerator 100 includes an outer case 106 and an inner liner 108. The space between case 106 and liner 108 is filled with an insulating material, such as, but not limited to, a foamed-in-place insulation. Additionally, the space within mullion 114 is filled with an insulating material, such as, but not limited to, a foamed-in-place insulation. Outer case 106 is normally formed by folding a sheet of a suitable material, such as pre-painted steel, into an inverted U-shape to form top and sidewalls of case 106. A bottom wall of case 106 is normally formed separately and attached to the case sidewalls and to a bottom frame (not shown) that provides support for refrigerator 100. Inner liner 108 is molded from a suitable plastic material to form freezer compartment 104 and fresh food compartment 102, respectively. Alternatively, liner 108 may be formed by bending and welding a sheet of a suitable metal, such as steel.
A rotatable door 110 closes access openings to fresh food compartment 102. Door 110 is mounted by a top hinge 112 and a bottom hinge (not shown) to rotate about its outer vertical edge between an open position, as shown in
In the exemplary embodiment, a chiller compartment 120 is located within rotatable door 110. During operation of the refrigerator 100, chiller compartment 120 is configured to be operated at a temperature that is different than FF compartment 102 temperature, but above the freezing temperature. Specifically, chiller compartment 120 is operated at a lower temperature than FF compartment 102 to facilitate chilling refrigerated items such as, but not limited to, beverages. Chiller compartment 120 operates as a quick chill compartment to chill refrigerated items more quickly than if the items were placed directly into the FF compartment 102, and without the risk of freezing. In the exemplary embodiment, chiller compartment 120 is fabricated from a material such as, for example, a plastic material. Moreover, in the exemplary embodiment, chiller compartment 120 includes an air inlet 122 formed in a sidewall 126 of chiller compartment 120 for injecting cool air into chiller compartment 120. Additionally, in one embodiment, an air outlet 124 is formed in chiller compartment 120 for expelling cool air therefrom.
In the exemplary embodiment, FF cooling system 130 also includes a chiller compartment cooling sub-system 140 for cooling chiller compartment 120 (shown in
In one embodiment, FF cooling system 130 also includes a heater 153 coupled to duct 150. Heater 153 facilitates reducing moisture within duct 150, thus reducing a risk of freezing within duct 150. Additionally, heater 153 facilitates preventing icing within and around duct 150. In another embodiment, heater 153 is utilized to defrost duct 150.
Returning to
In the exemplary embodiment, controller 156 is operatively coupled to chiller compartment fan 146. As such, controller 156 determines a mode of operation of chiller compartment fan 146 based on the inputs received by controller 156. In one embodiment chiller compartment fan 146 operates in either an “ON” or an “OFF” mode of operation. In another embodiment, chiller compartment fan 146 is a variable speed fan and operates at multiple speeds. In one embodiment, controller 156 may also be operatively coupled to FF fan 134.
Chiller compartment door 220 covers a cavity 222 defined by front and back panels 200 and 202, respectively. Door 220 includes a pair of projections 224 extending outwardly from a top side 226 and a bottom side 228 of door 220. Projections 224 are oriented for insertion into corresponding apertures 218 of front panel 200. A biasing member 230, such as, for example, a bias spring 232, is positioned between projections 224 and apertures 218. In operation, when a user opens chiller compartment door 220 to access chiller compartment 120, biasing member 230 provides a biasing force on door 220 to retain door 220 in an open position. As such, biasing member 230 facilitates accessing chiller compartment 120 without a user having to hold chiller compartment door 220 in an open position because door 220 remains in the open position by the biasing force.
In one embodiment, biasing member 230 retains door 220 in an open position that is substantially orthogonal with respect to front panel 200. In another embodiment, biasing member 230 retains door 220 in an open position that is approximately 110° with respect to front panel 200. As such, the user can close refrigerator door 110 without chiller compartment door 220 interfering with mullion 114 (shown in
In the exemplary embodiment, a latch mechanism 234 is coupled to chiller compartment door 220 and engages with side panel 204 to retain door 220 in a closed position. Specifically, an opening 236 is defined in a distal side 238 of chiller compartment door 220 and latch mechanism 234 is positioned within opening 236. In the exemplary embodiment, latch mechanism 234 is received in opening 236 and an elastic latch button 240 is engaged with latch mechanism 234. In the exemplary embodiment, latch button 240 releases latch mechanism 234 from side panel 204 such that chiller compartment door 220 may be opened.
In the exemplary embodiment, chiller compartment 120 has at least one positioning element 318 formed on each side thereof. Positioning elements 318 are oriented to be coupled to corresponding shoulders 306 extending from door insert inner surfaces 308. Specifically, chiller compartment 120 has a width that is less than the width of door insert 300 such that chiller compartment 120 can be positioned within door insert 300. In assembly, door insert 300 is positioned within door 110 such that positioning member 310 is substantially aligned with a corresponding support member 314 prior to being coupled thereto. Once coupled at a predetermined position, chiller compartment 120 is positioned within door insert 300 such that positioning elements 318 are substantially aligned with corresponding shoulders 306 prior to being coupled thereto. Positioning elements 318 engage shoulders 306 by moving chiller compartment 120 along a generally vertical path of movement. Due to the multiple positions available for door insert 300 to be coupled in refrigerator door 110, chiller compartment is useable with different sized FF liners 316. Alternatively, refrigerator door 110 is capable of receiving multiple sized chiller compartments 120.
A refrigerator having a chiller compartment is thus obtained by modulating a FF fan at the FF evaporator to direct cool air from the FF evaporator to the chiller compartment. As such, the chiller compartment is not cooled by air from a FZ compartment, thus reducing the risk of freezing the duct supplying air and the refrigerated items in the chiller compartment.
While the invention has been described in terms of various specific embodiments, those skilled in the art will recognize that the invention can be practiced with modification within the spirit and scope of the claims.
