Patent Application
20230375255
The present disclosure relates to an appliance such as a refrigerator.
In order to keep food fresh, a low temperature must be maintained within a refrigerator to reduce the reproduction rate of bacteria. Refrigerators circulate refrigerant and change the refrigerant from a liquid state to a gas state by an evaporation process in order cool the air within the refrigerator. During the evaporation process, heat is transferred to the refrigerant. After evaporating, a compressor increases the pressure, and in turn, the temperature of the refrigerant. The gas refrigerant is then condensed into a liquid and the excess heat is rejected to the ambient surroundings. The process then repeats.
A refrigerator appliance includes a refrigerator compartment, a freezer compartment, and a convertible compartment. The convertible compartment is defined by a liner and is configured to selectively transition between a secondary refrigerator compartment and a secondary freezer compartment. A heating coil is wrapped around the liner with the coil extending over at least two exterior walls of the liner.
A refrigerator appliance includes a refrigerator compartment, a freezer compartment, and a convertible compartment. The convertible compartment is defined by a liner and is configured to selectively transition between a secondary refrigerator compartment and a secondary freezer compartment. The appliance further includes a heat pump having a main condenser, a compressor connected in fluid communication with the main compressor, and a secondary condenser configured to heat the convertible compartment and in fluid communication with the main compressor, wherein the secondary condenser includes a coil wrapped around an exterior of the liner.
A refrigerator appliance includes a refrigerator compartment, a freezer compartment, and a convertible compartment. The convertible compartment is defined by a liner and is configured to selectively transition between a secondary refrigerator compartment and a secondary freezer compartment. The appliance further includes a heating coil associated with a heat pump of the refrigerator appliance. The heating coil is wrapped around an exterior of the liner with the coil extending over at least two exterior walls of the liner. A valve fluidly is connected to the heating coil and is configured to control fluid flow through the heating coil.
Embodiments of the present disclosure are described herein. It is to be understood, however, that the disclosed embodiments are merely examples and other embodiments may take various and alternative forms. The figures are not necessarily to scale; some features could be exaggerated or minimized to show details of particular components. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a representative basis for teaching one skilled in the art to variously employ the embodiments. As those of ordinary skill in the art will understand, various features illustrated and described with reference to any one of the figures may be combined with features illustrated in one or more other figures to produce embodiments that are not explicitly illustrated or described. The combinations of features illustrated provide representative embodiments for typical applications. Various combinations and modifications of the features consistent with the teachings of this disclosure, however, could be desired for particular applications or implementations.
Referring to
The compartments 34, 36, 38 are defined by one or more liners 42 of the appliance 20. For example, a single liner may be used to define all of the compartments 34, 36, 38. Alternatively, the appliance 20 may include multiple liners such as a liner associated with each of the compartments. The liner(s) includes sidewalls that cooperate to define the compartments. For example, each compartment is defined by five sidewalls of the one or more liners. The compartments are open on the front 22 to provide access. One or more doors (not shown) open and close the compartments 34, 36, 38. The one or more doors may be pivotally connected to the front 22 or may be pullout doors, e.g., slide open and closed. The one or more liners may be formed of plastic or other suitable material.
The one or more liners 42 is encased by exterior panels 40 of the appliance 20. An insulating material, such as an insulating foam, may be disposed between the exterior panels 40 and the liner(s) 42 in order reduce heat transfer with the ambient surroundings and increase the efficiency of the appliance 20.
Referring to
The compressor 52 and the fans 62 and 64 may be connected to a controller. Sensors that measure the air temperature within the compartments 34, 36, 38 may also be in communication with the controller. The controller may be configured to operate the compressor, fans, ducts, etc. in response to the air temperature within the compartments being outside of thresholds or in response to a user changing the state of the convertible compartment. Such a controller may be part of a larger control system and may be controlled by various other controllers throughout the appliance 20, and one or more other controllers can collectively be referred to as a “controller” that controls various functions of the appliance 20 in response to inputs or signals to control functions of the appliance 20. The controller may include a microprocessor or central processing unit (CPU) in communication with various types of computer readable storage devices or media. Computer readable storage devices or media may include volatile and nonvolatile storage in read-only memory (ROM), random-access memory (RAM), and keep-alive memory (KAM), for example. KAM is a persistent or non-volatile memory that may be used to store various operating variables while the CPU is powered down. Computer-readable storage devices or media may be implemented using any of a number of known memory devices such as PROMs (programmable read-only memory), EPROMs (electrically PROM), EEPROMs (electrically erasable PROM), flash memory, or any other electric, magnetic, optical, or combination memory devices capable of storing data, some of which represent executable instructions, used by the controller in controlling the appliance 20.
Switching the convertible compartment 38 between the refrigeration state and the freezer state requires a temperature change of approximately 30-40 degrees F., for example. That is, the convertible compartment 38 must be heated when changing from the freezer state to the refrigeration state and must be cooled when changing from the refrigeration state to the freezer state. Ideally, this temperature change will occur quickly while minimizing the consumption of energy.
Referring to
In the example heat pump 50, the valve 72 is disposed downstream of the compressor 52 and upstream of the primary condenser 54. Placing the secondary condenser 70 upstream of the primary condenser 54 reduces the workload on the primary condenser 54 and may allow the speed of the condenser fan 64 to be reduced thus improving energy efficiency of the system 50. The valve 72 may be a three-way valve having an inlet 74 connected to the compressor 52, a first outlet 76 connected to the secondary condenser 70, and a third outlet 78 connected to the primary condenser 54. The valve 72 may be configured to always provide refrigerant from the inlet 74 to the outlet 78 (primary condenser) and to selectively provide refrigerant from the inlet 74 to the outlet 76 (secondary condenser). Alternatively, the valve may be configured to route 100 percent of the referent to the outlet 76. A supply conduit 80 may connect from the outlet 76 to an inlet of the secondary compressor 70 and a return conduit 82 may connect the outlet of the secondary condenser 70 to the mainline of the heat pump 50, such as by a T-fitting or the like.
The secondary condenser 70 may be in contact with a liner 84 or a portion of the liner 42 depending upon the construction of the liner (as discussed above). The liner or liner portion 84 may include five sides such as a top 86, a bottom 88, sidewalls 90 and 92, and a back 94. Each of theses sides includes an interior surface 95 and an exterior surface 97. The interior surfaces of these five sides cooperate to define the convertible compartment 38. The secondary condenser 70 may include a coil 96 (sometimes called a heating coil) that is wrapped around the exterior surfaces of the liner 84 such that the coil 96 extends over at least two of the five sides. In the illustrated embodiment, the coil 96 extends over four sides of the liner 84, e.g., the top 86, the bottom 88, and the sidewalls 90 and 92. Of course, the coil 96 may extend over three sides in other embodiments. Faster heating of the convertible compartment 38 may be achievable by completely encircling the convertible compartment 38 with the coil 96 as shown in
The coil 96 includes one or more sections of interconnected tubing 100 configured to carry the refrigerant. The coil may be formed from a single tube that is bent to form the sections or may be constructed from multiple, joined segments of tubing. The tubing 100 may be disposed under the insulation layer 102 and in direct contact with the exterior surfaces 97 of the sides. For example, the tubing 100 may be secured against the exterior sides 97 by metallic tape or the like. Placing the tubing 100 in direct contact with the liner 84 may increase the thermal efficiency of the system. The tubing 100 may be metal such as cooper, aluminum, or other suitable material.
While the valve associated with the secondary condenser is shown as being between the compressor and primary condenser in the above-described example, this need not be the case in all embodiments.
Referring to
The above-described heating system for the convertible compartment 38 allows the compartment to be heated without adding an additional energy draw, such as an electric heater. The solution also does not require reducing thermal efficiency, e.g., less insulation, in order to heat the convertible compartment quickly. Instead, the appliance 20 takes advantage of the already present heat pump and simply adds, for example, an additional heat exchanger and valve in order to selectively discharge some of the already-present waste heat to the convertible compartment rather than rejecting all of it to the atmosphere at the primary condenser.
It should be understood that the designations of first, second, third, fourth, etc. for any component, state, or condition described herein may be rearranged in the claims so that they are in chronological order with respect to the claims.
The words used in the specification are words of description rather than limitation, and it is understood that various changes may be made without departing from the spirit and scope of the disclosure. As previously described, the features of various embodiments may be combined to form further embodiments that may not be explicitly described or illustrated. While various embodiments could have been described as providing advantages or being preferred over other embodiments or prior art implementations with respect to one or more desired characteristics, those of ordinary skill in the art recognize that one or more features or characteristics may be compromised to achieve desired overall system attributes, which depend on the specific application and implementation. As such, embodiments described as less desirable than other embodiments or prior art implementations with respect to one or more characteristics are not outside the scope of the disclosure and may be desirable for particular applications.
