Refrigerator

This application is a Continuation application of U.S. patent application Ser. No. 18/511,242 filed Nov. 16, 2023, which is a U.S. patent application Ser. No. 17/282,122 filed Apr. 1, 2021, now U.S. Pat. No. 11,874,043, issued Jan. 16, 2024, which is a U.S. National Stage Application under 35 U.S.C. § 371 of PCT Application No. PCT/KR2019/012884, filed Oct. 1, 2019, which claims priority to Korean Patent Application Nos. 10-2018-0117785, filed Oct. 2, 2018, 10-2018-0117819, filed Oct. 2, 2018, 10-2018-0117821, filed Oct. 2, 2018, 10-2018-0117822, filed Oct. 2, 2018, 10-2018-0142117, filed Nov. 16, 2018, 10-2019-0081688, filed Jul. 6, 2019, and 10-2019-0108884, filed Sep. 3, 2019 whose entire disclosures are hereby incorporated by reference.

The present disclosure relates to a refrigerator.

In general, refrigerators are home appliances for storing foods at a low temperature in a storage chamber that is covered by a door. The refrigerator may cool the inside of the storage space by using cold air to store the stored food in a refrigerated or frozen state. Generally, an ice maker for making ice is provided in the refrigerator. The ice maker makes ice by cooling water after accommodating the water supplied from a water supply source or a water tank into a tray. The ice maker may separate the made ice from the ice tray in a heating manner or twisting manner. As described above, the ice maker through which water is automatically supplied, and the ice automatically separated may be opened upward so that the mode ice is pumped up. As described above, the ice made in the ice maker may have at least one flat surface such as crescent or cubic shape.

When the ice has a spherical shape, it is more convenient to use the ice, and also, it is possible to provide different feeling of use to a user. Also, even when the made ice is stored, a contact area between the ice cubes may be minimized to minimize a mat of the ice cubes.

An ice maker is disclosed in Korean Registration No. 10-1850918 (hereinafter, referred to as a “prior art document”) that is a prior art document.

The ice maker disclosed in the prior art documentincludes an upper tray in which a plurality of upper cells, each of which has a hemispherical shape, are arranged, and which includes a pair of link guide parts extending upward from both side ends thereof, a lower tray in which a plurality of upper cells, each of which has a hemispherical shape and which is rotatably connected to the upper tray, a rotation shaft connected to rear ends of the lower tray and the upper tray to allow the lower tray to rotate with respect to the upper tray, a pair of links having one end connected to the lower tray and the other end connected to the link guide part, and an upper ejecting pin assembly connected to each of the pair of links in at state in which both ends thereof are inserted into the link guide part and elevated together with the upper ejecting pin assembly.

In the prior art document, although the spherical ice is made by the hemispherical upper cell and the hemispherical lower cell, since the ice is made at the same time in the upper and lower cells, bubbles containing water are not completely discharged but are dispersed in the water to make opaque ice.

An ice maker is disclosed in Japanese Patent Laid-Open No. 9-269172 (hereinafter, referred to as a “prior art document”) that is a prior art document.

The ice maker disclosed in the prior art documentincludes an ice making plate and a heater for heating a lower portion of water supplied to the ice making plate. In the case of the ice maker disclosed in the prior art document, water on one surface and a bottom surface of an ice making block is heated by the heater in an ice making process. Thus, when solidification proceeds on the surface of the water, and also, convection occurs in the water to make transparent ice. When growth of the transparent ice proceeds to reduce a volume of the water within the ice making block, the solidification rate is gradually increased, and thus, sufficient convection suitable for the solidification rate may not occur. Thus, in the case of the prior art document, when about ⅔ of water is solidified, a heating amount of heater increases to suppress an increase in the solidification rate. However, according to prior art document, since the heating amount of the heater is increased simply when the volume of water decreases, it is difficult to make ice having uniform transparency according to the shape of the ice.

Hereinafter, some embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. It should be noted that when components in the drawings are designated by reference numerals, the same components have the same reference numerals as far as possible even though the components are illustrated in different drawings. Further, in description of embodiments of the present disclosure, when it is determined that detailed descriptions of well-known configurations or functions disturb understanding of the embodiments of the present disclosure, the detailed descriptions will be omitted.

Also, in the description of the embodiments of the present disclosure, the terms such as first, second, A, B, (a) and (b) may be used. Each of the terms is merely used to distinguish the corresponding component from other components, and does not delimit an essence, an order or a sequence of the corresponding component. It should be understood that when one component is “connected”, “coupled” or “joined” to another component, the former may be directly connected, coupled or jointed to the latter or may be “connected”, coupled” or “joined” to the latter with a third component interposed therebetween.

A refrigerator according to an embodiment may include a tray assembly defining a portion of an ice making cell that is a space in which water is phase-changed into ice, a cooler supplying cold to the ice making cell, a water supply part supplying water to the ice making cell, and a controller. The refrigerator may further include a temperature sensor detecting a temperature of water or ice of the ice making cell. The refrigerator may further include a heater disposed adjacent to the tray assembly. The refrigerator may further include a driver to move the tray assembly. The refrigerator may further include a storage chamber in which food is stored in addition to the ice making cell. The refrigerator may further include a cooler supplying cold to the storage chamber. The refrigerator may further include a temperature sensor sensing a temperature in the storage chamber. The controller may control at least one of the water supply part or the cooler. The controller may control at least one of the heater or the driver.

The controller may control the cooler so that cold is supplied to the ice making cell after moving the tray assembly to an ice making position. The controller may control the second tray assembly so that the second tray assembly moves to an ice separation position in a forward direction so as to take out the ice in the ice making cell when the ice making is completed in the ice making cell. The controller may control the tray assembly so that the supply of the water supply part starts after the second tray assembly moves to the water supply position in the reverse direction when the ice separation is completed. The controller may control the tray assembly so as to move to the ice making position after the water supply is completed.

According to an embodiment, the storage chamber may be defined as a space that is controlled to a predetermined temperature by the cooler. An outer case may be defined as a wall that divides the storage chamber and an external space of the storage chamber (i.e., an external space of the refrigerator). An insulation material may be disposed between the outer case and the storage chamber. An inner case may be disposed between the insulation material and the storage chamber.

According to an embodiment, the ice making cell may be disposed in the storage chamber and may be defined as a space in which water is phase-changed into ice. A circumference of the ice making cell refers to an outer surface of the ice making cell irrespective of the shape of the ice making cell. In another aspect, an outer circumferential surface of the ice making cell may refer to an inner surface of the wall defining the ice making cell. A center of the ice making cell refers to a center of gravity or volume of the ice making cell. The center may pass through a symmetry line of the ice making cell.

According to an embodiment, the tray may be defined as a wall partitioning the ice making cell from the inside of the storage chamber. The tray may be defined as a wall defining at least a portion of the ice making cell. The tray may be configured to surround the whole or a portion of the ice making cell. The tray may include a first portion that defines at least a portion of the ice making cell and a second portion extending from a predetermined point of the first portion. The tray may be provided in plurality. The plurality of trays may contact each other. For example, the tray disposed at the lower portion may include a plurality of trays. The tray disposed at the upper portion may include a plurality of trays. The refrigerator may include at least one tray disposed under the ice making cell. The refrigerator may further include a tray disposed above the ice making cell. The first portion and the second portion may have a structure inconsideration of a degree of heat transfer of the tray, a degree of cold transfer of the tray, a degree of deformation resistance of the tray, a degree of restoration of the tray, a degree of supercooling of the tray, a degree of attachment between the tray and ice solidified in the tray, and coupling force between one tray and the other tray of the plurality of trays.

According to an embodiment, the tray case may be disposed between the tray and the storage chamber. That is, the tray case may be disposed so that at least a portion thereof surrounds the tray. The tray case may be provided in plurality. The plurality of tray cases may contact each other. The tray case may contact the tray to support at least a portion of the tray. The tray case may be configured to connect components except for the tray (e.g., a heater, a sensor, a power transmission member, etc.). The tray case may be directly coupled to the component or coupled to the component via a medium therebetween. For example, if the wall defining the ice making cell is provided as a thin film, and a structure surrounding the thin film is provided, the thin film may be defined as a tray, and the structure may be defined as a tray case. For another example, if a portion of the wall defining the ice making cell is provided as a thin film, and a structure includes a first portion defining the other portion of the wall defining the ice making cell and a second part surrounding the thin film, the thin film and the first portion of the structure are defined as a tray, and the second portion of the structure is defined as a tray case.

According to an embodiment, the tray assembly may be defined to include at least the tray. According to an embodiment, the tray assembly may further include the tray case.

According to an embodiment, the refrigerator may include at least one tray assembly connected to the driver to move. The driver is configured to move the tray assembly in at least one axial direction of the X, Y, or Z axis or to rotate about the axis of at least one of the X, Y, or Z axis. The embodiment may include a refrigerator having the remaining configuration except for the driver and the power transmission member connecting the driver to the tray assembly in the contents described in the detailed description. According to an embodiment, the tray assembly may move in a first direction.

According to an embodiment, the cooler may be defined as a part configured to cool the storage chamber including at least one of an evaporator or a thermoelectric element.

According to an embodiment, the refrigerator may include at least one tray assembly in which the heater is disposed. The heater may be disposed in the vicinity of the tray assembly to heat the ice making cell defined by the tray assembly in which the heater is disposed. The heater may include a heater (hereinafter referred to as an “transparent ice heater”) to be turned on in at least partial section while the cooler supplies cold so that bubbles dissolved in the water within the ice making cell moves from a portion, at which the ice is made, toward the water that is in a liquid state to make transparent ice. The heater may include a heater (hereinafter referred to as an “ice separation heater”) controlled to be turned on in at least a section after the ice making is completed so that ice is easily separated from the tray assembly. The refrigerator may include a plurality of transparent ice heaters. The refrigerator may include a plurality of ice separation heaters. The refrigerator may include a transparent ice heater and an ice separation heater. In this case, the controller may control the ice separation heater so that a heating amount of ice separation heater is greater than that of transparent ice heater.

According to an embodiment, the tray assembly may include a first region and a second region, which define an outer circumferential surface of the ice making cell. The tray assembly may include a first portion that defines at least a portion of the ice making cell and a second portion extending from a predetermined point of the first portion.

For example, the first region may be defined in the first portion of the tray assembly. The first and second regions may be defined in the first portion of the tray assembly. Each of the first and second regions may be a portion of the one tray assembly. The first and second regions may be disposed to contact each other. The first region may be a lower portion of the ice making cell defined by the tray assembly. The second region may be an upper portion of an ice making cell defined by the tray assembly. The refrigerator may include an additional tray assembly. One of the first and second regions may include a region contacting the additional tray assembly. When the additional tray assembly is disposed in a lower portion of the first region, the additional tray assembly may contact the lower portion of the first region. When the additional tray assembly is disposed in an upper portion of the second region, the additional tray assembly and the upper portion of the second region may contact each other.

For another example, the tray assembly may be provided in plurality contacting each other. The first region may be disposed in a first tray assembly of the plurality of tray assemblies, and the second region may be disposed in a second tray assembly. The first region may be the first tray assembly. The second region may be the second tray assembly. The first and second regions may be disposed to contact each other. At least a portion of the first tray assembly may be disposed under the ice making cell defined by the first and second tray assemblies. At least a portion of the second tray assembly may be disposed above the ice making cell defined by the first and second tray assemblies.

The first region may be a region closer to the heater than the second region. The first region may be a region in which the heater is disposed. The second region may be a region closer to a heat absorbing part (i.e., a coolant pipe or a heat absorbing part of a thermoelectric module) of the cooler than the first region. The second region may be a region closer to the through-hole supplying cold to the ice making cell than the first region. To allow the cooler to supply the cold through the through-hole, an additional through-hole may be defined in another component. The second region may be a region closer to the additional through-hole than the first region. The heater may be a transparent ice heater. The heat insulation degree of the second region with respect to the cold may be less than that of the first region.

The heater may be disposed in one of the first and second tray assemblies of the refrigerator. For example, when the heater is not disposed on the other one, the controller may control the heater to be turned on in at least a section of the cooler to supply the cold. For another example, when the additional heater is disposed on the other one, the controller may control the heater so that the heating amount of heater is greater than that of additional heater in at least a section of the cooler to supply the cold. The heater may be a transparent ice heater.

The embodiment may include a refrigerator having a configuration excluding the transparent ice heater in the contents described in the detailed description.

The embodiment may include a pusher including a first edge having a surface pressing the ice or at least one surface of the tray assembly so that the ice is easily separated from the tray assembly. The pusher may include a bar extending from the first edge and a second edge disposed at an end of the bar. The controller may control the pusher so that a position of the pusher is changed by moving at least one of the pusher or the tray assembly. The pusher may be defined as a penetrating type pusher, a non-penetrating type pusher, a movable pusher, or a fixed pusher according to a view point.

The through-hole through which the pusher moves may be defined in the tray assembly, and the pusher may be configured to directly press the ice in the tray assembly. The pusher may be defined as a penetrating type pusher.

The tray assembly may be provided with a pressing part to be pressed by the pusher, the pusher may be configured to apply a pressure to one surface of the tray assembly. The pusher may be defined as a non-penetrating type pusher.

The controller may control the pusher to move so that the first edge of the pusher is disposed between a first point outside the ice making cell and a second point inside the ice making cell. The pusher may be defined as a movable pusher. The pusher may be connected to a driver, a rotation shaft of the driver, or the tray assembly that is connected to the driver and is movable.

The controller may control the pusher to move at least one of the tray assemblies so that the first edge of the pusher is disposed between the first point outside the ice making cell and the second point inside the ice making cell. The controller may control at least one of the tray assemblies to move to the pusher. Alternatively, the controller may control a relative position of the pusher and the tray assembly so that the pusher further presses the pressing part after contacting the pressing part at the first point outside the ice making cell. The pusher may be coupled to a fixed end. The pusher may be defined as a fixed pusher.

According to an embodiment, the ice making cell may be cooled by the cooler cooling the storage chamber. For example, the storage chamber in which the ice making cell is disposed may be a freezing compartment which is controlled at a temperature lower than 0° C., and the ice making cell may be cooled by the cooler cooling the freezing compartment.

The freezing compartment may be divided into a plurality of regions, and the ice making cell may be disposed in one region of the plurality of regions.

According to an embodiment, the ice making cell may be cooled by a cooler other than the cooler cooling the storage chamber. For example, the storage chamber in which the ice making cell is disposed is a refrigerating compartment which is controlled to a temperature higher than 0° C., and the ice making cell may be cooled by a cooler other than the cooler cooling the refrigerating compartment. That is, the refrigerator may include a refrigerating compartment and a freezing compartment, and the ice making cell may be disposed inside the refrigerating compartment, and the ice making cell may be cooled by the cooler that cools the freezing compartment. The ice making cell may be disposed in a door that opens and closes the storage chamber.

According to an embodiment, the ice making cell is not disposed inside the storage chamber and may be cooled by the cooler. For example, an entire of a storage chamber defined inside the outer case may be the ice making cell.

According to an embodiment, a degree of heat transfer indicates a degree of heat transfer from a high-temperature object to a low-temperature object and is defined as a value determined by a shape including a thickness of the object, a material of the object, etc. In terms of the material of the object, a high degree of the heat transfer of the object may represent that thermal conductivity of the object is high. The thermal conductivity may be a unique material property of the object. Even when the material of the object is the same, the degree of heat transfer may vary depending on the shape of the object.

The degree of heat transfer may vary depending on the shape of the object. The degree of heat transfer from a point A to a point B may be influenced by a length of a path through which heat is transferred from the point A to the point B (hereinafter, referred to as a “heat transfer path”). The more the heat transfer path from the point A to the point B increases, the more the degree of heat transfer from the point A to the point B may decrease. The more the heat transfer path from the point A to the point B decreases, the more the degree of heat transfer from the point A to the point B may increase.

The degree of heat transfer from the point A to the point B may be influenced by a thickness of the path through which heat is transferred from the point A to the point B. The more the thickness in a path direction in which heat is transferred from the point A to the point B decreases, the more the degree of heat transfer from the point A to the point B may decrease. The greater the thickness in the path direction from which the heat from point A to point B is transferred, the greater the degree of heat transfer from point A to point B.

According to an embodiment, a degree of cold transfer indicates a degree of heat transfer from a low-temperature object to a high-temperature object and is defined as a value determined by a shape including a thickness of the object, a material of the object, etc. The degree of cold transfer is a term defined in consideration of a direction in which cold flows and may be regarded as the same concept as the degree of heat transfer. The same concept as the degree of heat transfer will be omitted.

According to an embodiment, a degree of supercooling is a degree of supercooling of a liquid and may be defined as a value determined by a material of the liquid, a material or shape of a container containing the liquid, an external factor applied to the liquid during a solidification process of the liquid, etc. An increase in frequency at which the liquid is supercooled may be seen as an increase in degree of the supercooling. The lowering of the temperature at which the liquid is maintained in the supercooled state may be seen as an increase in degree of the supercooling. Here, the supercooling refers to a state in which the liquid exists in the liquid phase without solidification even at a temperature below a freezing point of the liquid. The supercooled liquid has a characteristic in which the solidification rapidly occurs from a time point at which the supercooling is terminated. If it is desired to maintain a rate at which the liquid is solidified, it is advantageous to be designed so that the supercooling phenomenon decreases.

According to an embodiment, a degree of deformation resistance represents a degree to which an object resists deformation due to external force applied to the object and is a value determined by a shape including a thickness of the object, a material of the object, etc. For example, the external force may include a pressure applied to the tray assembly in the process of solidifying water in the ice making cell into ice. In another example, the external force may include a pressure on the ice or a portion of the tray assembly by the pusher for separating the ice from the tray assembly. For another example, when coupled between the tray assemblies, it may include a pressure applied by the coupling.

In terms of the material of the object, a high degree of the deformation resistance of the object may represent that rigidity of the object is high. The rigidity may be a unique material property of the object. Even when the material of the object is the same, the degree of deformation resistance may vary depending on the shape of the object. The degree of deformation resistance may be affected by a deformation resistance reinforcement part extending in a direction in which the external force is applied. The more the rigidity of the deformation resistance reinforcement part increases, the more the degree of deformation resistance may increase. The more the height of the extending deformation resistance reinforcement part increase, the more the degree of deformation resistance may increase.

According to an embodiment, a degree of restoration indicates a degree to which an object deformed by the external force is restored to a shape of the object before the external force is applied after the external force is removed and is defined as a value determined by a shape including a thickness of the object, a material of the object, etc. For example, the external force may include a pressure applied to the tray assembly in the process of solidifying water in the ice making cell into ice. In another example, the external force may include a pressure on the ice or a portion of the tray assembly by the pusher for separating the ice from the tray assembly. For another example, when coupled between the tray assemblies, it may include a pressure applied by the coupling force.

In view of the material of the object, a high degree of the restoration of the object may represent that an elastic modulus of the object is high. The elastic modulus may be a material property unique to the object. Even when the material of the object is the same, the degree of restoration may vary depending on the shape of the object. The degree of restoration may be affected by an elastic resistance reinforcement part extending in a direction in which the external force is applied. The more the elastic modulus of the elastic resistance reinforcement part increases, the more the degree of restoration may increase.

According to an embodiment, a coupling force represents a degree of coupling between the plurality of tray assemblies and is defined as a value determined by a shape including a thickness of the tray assembly, a material of the tray assembly, magnitude of the force that couples the trays to each other, etc.

According to an embodiment, a degree of attachment indicates a degree to which the ice and the container are attached to each other in a process of making ice from water contained in the container and is defined as a value determined by a shape including a thickness of the container, a material of the container, a time elapsed after the ice is made in the container, etc.

A refrigerator according to an embodiment includes a first tray assembly defining a portion of an ice making cell that is a space in which water is phase-changed into ice by cold, a second tray assembly defining portion of the ice making cell, a cooler supplying cold to the ice making cell, a water supply part supplying water to the ice making cell, and a controller. The refrigerator may further include a storage chamber in addition to the ice making cell. The storage chamber may include a space for storing food. The ice making cell may be disposed in the storage chamber. The refrigerator may further include a first temperature sensor sensing a temperature in the storage chamber. The refrigerator may further include a second temperature sensor sensing a temperature of water or ice of the ice making cell. The second tray assembly may contact the first tray assembly in the ice making process and may be connected to the driver to be spaced apart from the first tray assembly in the ice separation process. The refrigerator may further include a heater disposed adjacent to at least one of the first tray assembly or the second tray assembly.

The controller may control at least one of the heater or the driver. The controller may control the cooler so that the cold is supplied to the ice making cell after the second tray assembly moves to an ice making position when a water supply to the ice making cell is completed. The controller may control the second tray assembly so that the second tray assembly moves in a reverse direction after moving to an ice separation position in a forward direction so as to take out the ice in the ice making cell when the ice making in the ice making cell is completed. The controller may control the second tray assembly so that the supply of the water supply part after the second tray assembly moves to the water supply position in the reverse direction when the ice is completely separated.

Transparent ice will be described. Bubbles are dissolved in water, and the ice solidified with the bubbles may have low transparency due to the bubbles. Therefore, in the process of water solidification, when the bubble is guided to move from a freezing portion in the ice making cell to another portion that is not yet frozen, the transparency of the ice may increase.