refrigerator

Abstract

The present invention relates to an ice maker and / or a refrigerator having the ice maker. In an aspect of the present invention, the refrigerator comprises: a storage chamber storing food; a door opening / closing the storage chamber; an ice-making chamber provided on the door or in the storage chamber; a cooler for supplying cold air to the storage chamber; cells which are provided in the ice-making chamber and are spaces where the phase of a material changes from liquid to solid phase; a first tray providing a first wall forming at least part of the cells; and a second tray providing a second wall forming another part of the cells. The degree of adhesion degree between the material which is phase-changed into the solid state and the first tray may be less than the degree of adhesion between the material that is phase-changed into the solid phase and the second tray.

Description

Technical Field

[0001] The present specification relates to an ice maker and / or a refrigerator equipped with an ice maker.Background Art

[0002] Generally, a refrigerator is a home appliance capable of storing food at low temperatures in an internal storage space shielded by a door, and by cooling the inside of the storage space using cold air, stored food may be kept in a refrigerated or frozen state.

[0003] Typically, a refrigerator is provided with an ice maker for making ice. The ice maker generates ice by receiving water supplied from a water source or a water tank into a tray and then cooling the water. In addition, the ice maker may release the ice from the ice tray using a heating method or a twisting method. An ice maker that automatically supplies water and releases ice in this manner is formed to open upward to scoop out the molded ice.

[0004] Ice produced in an ice maker of such a structure has at least one flat surface, such as a crescent shape or a cubic shape. On the other hand, if the ice is formed in a spherical shape, it may be more convenient to use the ice and may provide a unique user experience. Furthermore, during storage of the manufactured ice, sticking between ice pieces may be minimized by reducing the contact area between the ice pieces. Recently, attempts have also been made to manufacture transparent ice.Summary of the Invention Technical Problem

[0005] An object of an embodiment of the present invention is to provide an ice maker and / or a refrigerator provided with the ice maker, which includes a tray forming an opening smaller than a diameter of ice and discharges the ice using deformation of the tray.

[0006] An object of an embodiment of the present invention is to provide an ice maker and / or a refrigerator provided with the ice maker, which may easily implement a cell of a desired shape by including a tray having a first cell wall forming at least a part of the cell and an additional tray forming another part of the cell and having a second cell wall of a smaller size than the first cell wall.

[0007] An object of an embodiment of the present invention is to provide an ice maker and / or a refrigerator provided with the ice maker, in which a shape, material, or thickness of a tray is improved so that internal deformation resistance of the tray is reduced in a radial direction of a cell during a deformation process of the tray.

[0008] An object of an embodiment of the present invention is to provide an ice maker and / or a refrigerator provided with the ice maker, in which a shape, material, or thickness of a tray is improved so that internal deformation resistance of the tray is increased in an ice-releasing direction of ice during a deformation process of the tray.Technical Solution

[0009] An ice maker according to an embodiment of the present invention may include a first tray forming at least a portion of a cell and a second tray forming another portion of the cell.

[0010] The first tray may include a first wall and a second wall.

[0011] In one aspect, the first wall may include a portion having lower internal deformation resistance than the second wall.

[0012] The first tray may include a guide for supplying a substance to the cell, and the guide may include a third wall connected to the first wall.

[0013] The first wall of the first tray may include a portion having lower internal deformation resistance in a first direction than the second wall of the first tray.

[0014] The internal deformation resistance represents a degree of resisting deformation against an external force including gravity, and may be a value determined by a material, shape, thickness, and the like of the first tray.

[0015] For example, the internal deformation resistance may be understood as a factor representing stiffness, elastic modulus, hardness, or flexibility.

[0016] The first direction may be a radial direction of the cell.

[0017] The first wall of the first tray may include a portion having lower internal deformation resistance in a second direction than the second wall of the first tray.

[0018] The second direction may be a direction in which a substance located in the cell is discharged from an internal space of the first tray to an external space of the first tray through an opening of the first tray.

[0019] For example, the second direction may be a direction in which ice is released (ice-releasing direction).

[0020] The second direction may be a direction perpendicular to the first direction.

[0021] The first wall of the first tray may include a portion where internal deformation resistance in the first direction is less than internal deformation resistance in the second direction.

[0022] In the first wall of the first tray, internal deformation resistance in the first direction may vary along the second direction, and at this time, a rate of change of the internal deformation resistance in the first direction may have a first value.

[0023] In the first wall of the first tray, internal deformation resistance in the second direction may vary along the first direction, and at this time, a rate of change of the internal deformation resistance in the second direction may have a second value.

[0024] The first value may be greater than the second value.

[0025] In another aspect, the first tray may include portions having different thicknesses (thickness perspective of the first tray).

[0026] The first tray may include a first region having a first thickness and a second region having a second thickness greater than the first thickness.

[0027] In the first tray, a ratio occupied by the first region out of a total area combining the first region and the second region may be formed to be greater than a ratio occupied by the second region.

[0028] In the first tray, the ratio occupied by the first region out of the total area combining the first region and the second region may increase as it approaches the opening in the second direction.

[0029] For example, the first region of the first wall may have a shape of a triangle, a rhombus, an arc, or an inverted Y-shape.

[0030] In the second region, a length in a circumferential direction at a first portion of the first wall may be less than a length in the circumferential direction at a second portion further from the opening than the first portion in the first wall.

[0031] For example, the second region may have a shape of a triangle, a rhombus, or an inverted Y-shape.

[0032] The second region may include a first rib extending in the first direction and a second rib extending in the second direction.

[0033] The first rib may be a first portion of a second part of the first tray.

[0034] The second rib may be a reinforcing rib.

[0035] The first and second regions may be molded together.

[0036] For example, the first and second regions may be molded together by a method such as sheet metal working or injection molding.

[0037] After the first and second regions are respectively pre-molded, the first region and the second region may be coupled.

[0038] After the first wall is pre-molded, a part of the first wall may be additionally coupled to a part of the first tray, so that the first and second regions of the first tray may be formed as distinct regions.

[0039] For example, an embossed rib for increasing thickness, such as an attachment, may be additionally coupled.

[0040] After the first wall is pre-molded, a part of the first tray may be removed, so that the first and second regions of the first tray may be formed as distinct regions.

[0041] For example, an engraved rib for reducing thickness, such as cutting or melting, may be formed.

[0042] After the first wall is pre-molded, a force may be applied to a part of the first tray, so that the first and second regions of the first tray may be formed as distinct regions.

[0043] For example, an engraved rib for reducing thickness, such as pressing, may be formed.

[0044] The first region of the first wall may be provided spaced apart from a portion where a circumference of the cell is maximum among walls of the first tray.

[0045] The first region of the first wall may extend to the opening in the second direction.

[0046] In another aspect, the first wall of the first tray may include a first region including a portion extending in the first direction while forming the first wall, and a second region connected to the first region and including a first portion extending in a second direction different from the first direction (internal deformation resistance reinforcing rib applicable even in case of same thickness).

[0047] The first wall may include an internal deformation resistance reinforcing rib.

[0048] Internal deformation resistance of the first region may be less than that of the second region.

[0049] In the first wall of the first tray, a ratio occupied by the first region out of a total area combining the first region and the second region may be less than that of the second wall of the first tray.

[0050] The second region of the first tray may include a second portion extending from the first portion in a direction different from the second direction.

[0051] A direction in which the first portion extends includes the first direction, a direction in which the second portion extends includes the second direction, and a length of the first portion extending in the first direction may be greater than a length of the second portion extending in the second direction.

[0052] In the first wall of the first tray, a ratio occupied by the first region out of the total area combining the first region and the second region may decrease as it approaches the opening in the second direction.

[0053] The first and second regions of the first wall may be molded together.

[0054] For example, the first and second regions may be molded together by a method such as sheet metal working or injection molding.

[0055] After the first and second regions of the first wall are respectively pre-molded, the first region and the second region may be coupled.

[0056] After the first wall is pre-molded, a part of the first wall may be additionally coupled to a part of the first tray, so that the first and second regions of the first tray may be formed as distinct regions.

[0057] For example, an embossed rib for increasing thickness, such as an attachment, may be additionally coupled.

[0058] After the first wall is pre-molded, a part of the first tray may be removed, so that the first and second regions of the first tray may be formed as distinct regions.

[0059] For example, an engraved rib for reducing thickness, such as cutting or melting, may be formed.

[0060] After the first wall is pre-molded, a force may be applied to a part of the first tray, so that the first and second regions of the first tray may be formed as distinct regions.

[0061] For example, an engraved rib for reducing thickness, such as pressing, may be formed.

[0062] The first region of the first wall may be provided spaced apart from a portion where a circumference of the cell is maximum among walls of the first tray.

[0063] The first region of the first wall may extend to the opening in the second direction.

[0064] In another aspect, the first wall of the first tray may include a first region including a portion extending in the first direction while forming the first wall, and a second region connected to the first region and including a first portion extending in a second direction different from the first direction (internal deformation resistance reducing rib applicable even in case of same thickness).

[0065] The internal deformation resistance of the first region may be greater than that of the second region.

[0066] In the first wall of the first tray, a ratio occupied by the first region out of a total area combining the first region and the second region may be greater than that of the second wall of the first tray.

[0067] The second region of the first tray may include a second portion extending from the first portion in a direction different from the second direction.

[0068] A direction in which the first portion extends includes the first direction, a direction in which the second portion extends includes the second direction, and a length of the first portion extending in the first direction may be formed to be less than a length of the second portion extending in the second direction.

[0069] In the first wall of the first tray, a ratio occupied by the first region out of the total area combining the first region and the second region may increase as it approaches the opening in the second direction.

[0070] The first and second regions of the first wall may be molded together.

[0071] For example, the first and second regions may be molded together by a method such as sheet metal working or injection molding.

[0072] After the first and second regions of the first wall are respectively pre-molded, the first region and the second region may be coupled.

[0073] After the first wall is pre-molded, a part of the first wall may be additionally coupled to a part of the first tray, so that the first and second regions of the first tray may be formed as distinct regions.

[0074] For example, an embossed rib for increasing thickness, such as an attachment, may be additionally coupled.

[0075] After the first wall is pre-molded, a part of the first tray may be removed, so that the first and second regions of the first tray may be formed as distinct regions.

[0076] For example, an engraved rib for reducing thickness, such as cutting or melting, may be formed.

[0077] After the first wall is pre-molded, a force may be applied to a part of the first tray, so that the first and second regions of the first tray may be formed as distinct regions.

[0078] For example, an engraved rib for reducing thickness, such as pressing, may be formed.

[0079] The first region of the first wall may be provided spaced apart from a portion where a circumference of the cell is maximum among walls of the first tray.

[0080] The first region of the first wall may extend to the opening in the second direction.

[0081] In another aspect, the first wall of the first tray may include a first region having a first internal deformation resistance and a second region having a second internal deformation resistance greater than the first internal deformation resistance (material perspective of the first tray).

[0082] A material of the first region and a material of the second region may be different from each other.

[0083] In the first wall of the first tray, a ratio occupied by the first region out of a total area combining the first region and the second region may be greater than that of the second wall of the first tray.

[0084] In the first wall of the first tray, a ratio occupied by the first region out of the total area combining the first region and the second region may increase as it approaches the opening in the second direction.

[0085] The first and second regions of the first wall may be molded together.

[0086] For example, the first and second regions may be molded together by a method such as sheet metal working or injection molding.

[0087] After the first and second regions of the first wall are respectively pre-molded, the first region and the second region may be coupled.

[0088] After the first wall is pre-molded, a part of the first wall may be additionally coupled to a part of the first tray, so that the first and second regions of the first tray may be formed as distinct regions.

[0089] For example, an embossed rib for increasing thickness, such as an attachment, may be additionally coupled.

[0090] After the first wall is pre-molded, a part of the first tray may be removed, so that the first and second regions of the first tray may be formed as distinct regions.

[0091] For example, an engraved rib for reducing thickness, such as cutting or melting, may be formed.

[0092] After the first wall is pre-molded, a force may be applied to a part of the first tray, so that the first and second regions of the first tray may be formed as distinct regions.

[0093] For example, an engraved rib for reducing thickness, such as pressing, may be formed.

[0094] The first region of the first wall may be provided spaced apart from a portion where a circumference of the cell is maximum among walls of the first tray.

[0095] The first region of the first wall may extend to the opening in the second direction.

[0096] A refrigerator according to an embodiment of the present invention may include: a storage space in which food is stored; a door for opening and closing the storage space; an ice-making space provided in the door or the storage space; a cooler for supplying cold to the storage space; a cell provided in the ice-making space and being a space in which a substance undergoes a phase change from a liquid phase to a solid phase; and a tray wall provided with a first wall forming at least a portion of the cell and a second wall forming another portion of the cell.

[0097] The first wall may include a portion having internal deformation resistance less than that of the second wall.

[0098] The first wall may include a portion where internal deformation resistance in a radial direction of the cell or internal deformation resistance in an ice-releasing direction is less than that of the second wall.

[0099] The first wall may include a portion where internal deformation resistance in the radial direction of the cell is less than internal deformation resistance in the ice-releasing direction.

[0100] In the first wall, internal deformation resistance in the radial direction of the cell may vary along the ice-releasing direction of the cell, and internal deformation resistance in the ice-releasing direction of the cell may vary along the radial direction of the cell.

[0101] A first rate of change at which the internal deformation resistance in the radial direction of the cell varies along the ice-releasing direction of the cell may be formed to be greater than a second rate of change at which the internal deformation resistance in the ice-releasing direction of the cell varies along the radial direction of the cell.

[0102] The first wall and the second wall may constitute a first tray, the first wall may contact a second tray, and the second wall may be supported by a tray supporter.

[0103] The first wall may include a first region having a first thickness and a second region having a second thickness greater than the first thickness.

[0104] In the first wall, a ratio occupied by the first region out of a total area combining the first region and the second region may be formed to be greater than a ratio occupied by the second region.

[0105] The second region may be formed to be more adjacent to a center of the cell among the center of the cell and an opening of the tray wall, and the opening may be a through-hole through which a solid substance is discharged.

[0106] The first region may be formed to be more adjacent to the opening among the center of the cell and the opening of the tray wall, and the opening may be a through-hole through which a solid substance is discharged.

[0107] The size of the first region may be configured to increase from the center of the cell toward the opening.

[0108] The second region may extend in a shape of a triangle, a rhombus, an arc, or an inverted Y-shape from the center of the cell toward the opening.

[0109] The second region may include a first portion and a second portion extending in a circumferential direction, and at least a portion of the first region may be located between the first portion and the second portion.

[0110] When defining a circumferential extension line ℓ1 passing through a portion of the first wall, the extension line ℓ1 may alternately pass through the first region and the second region.

[0111] The second region may include a first rib extending in a circumferential direction of the first wall and a second rib connected to the first rib and extending toward the opening of the tray wall.

[0112] The second region may include a rib extending in the ice-releasing direction from the center of the cell toward the opening of the tray wall.

[0113] The rib may include a plurality of ribs arranged to be spaced apart in the circumferential direction, and the second region may include an additional rib connecting the plurality of ribs and extending in the circumferential direction.

[0114] The first region and the second region may be integrally molded, or the first region and the second region may be separately provided and coupled to each other.

[0115] The first region and the second region may be composed of different materials so that internal deformation resistance of the first region and internal deformation resistance of the second region are formed differently.

[0116] The tray wall may include an opening through which a solid substance is discharged, and a diameter of the opening relative to a diameter of the cell may be formed to be 70% or more and less than 100%.

[0117] The refrigerator may include a pusher for pressing the tray wall, and a hardness of the tray wall may be determined to be a value greater than a first hardness H1 and less than a second hardness H2 so that an insertion depth of the pusher, at which a maximum ice-releasing force is generated, is formed in a range of 14% to 35% relative to a diameter of ice.Advantageous Effects

[0118] According to an embodiment of the present invention, an ice maker includes a tray forming an opening smaller than a diameter of ice, and the ice may be easily discharged by using deformation of the tray.

[0119] According to an embodiment of the present invention, a cell of a desired shape may be easily implemented by including a tray having a first cell wall forming at least a portion of the cell and an additional tray forming another portion of the cell and having a second cell wall of a smaller size than the first cell wall.

[0120] According to an embodiment of the present invention, ice-releasing performance may be improved by improving a shape, material, or thickness of a tray so that internal deformation resistance of the tray is reduced in a radial direction of a cell during a deformation process of the tray.

[0121] According to an embodiment of the present invention, ice-releasing performance may be improved by improving a shape, material, or thickness of a tray so that internal deformation resistance of the tray is increased in an ice-releasing direction of ice during a deformation process of the tray.Brief Description of Drawings

[0122] FIG. 1 is a view showing a refrigerator according to an embodiment of the present invention. FIG. 2 is a perspective view showing an ice maker of a first embodiment of the invention. FIG. 3 is an exploded perspective view of an ice maker of a first embodiment of the invention. FIG. 4 is a cross-sectional view of the ice maker of the first embodiment of the invention. FIG. 5 is a view showing a tray assembly of the first embodiment of the present invention. FIG. 6 is a view showing a first tray according to the first embodiment of the present invention. FIG. 7 is a side view of the first tray. FIG. 8 is a plan view of the first tray. FIG. 9 is a bottom view of the first tray. FIG. 10 is a cross-sectional view taken along line 10-10 of FIG. 6. FIG. 11 is a cross-sectional view taken along line 11-11 of FIG. 6. FIG. 12 is a cross-sectional view taken along line 12-12 of FIG. 6. FIG. 13 is a front view of the first tray. FIG. 14 is a cross-sectional view taken along line 14-14 of FIG. 13. FIG. 15 is a cross-sectional view taken along line 15-15 of FIG. 13. FIG. 16 is a cross-sectional view of the tray assembly. FIGS. 17 and 18 are views showing operating states of the ice maker according to the first embodiment of the present invention. FIG. 19 is a graph showing a change in withdrawal force measured according to a withdrawal distance during an ice-releasing process of ice. FIG. 20 is a view showing a configuration of a pusher of the first embodiment of the invention. FIG. 21 is a schematic view showing how a difference in timing of maximum ice-releasing force occurs according to a difference in length of pushers during an ice-releasing process of ice. FIG. 22 is an experimental graph showing a change in maximum ice-releasing force according to a ratio of a diameter of ice to a diameter of an opening of the first tray. FIG. 23 is an experimental graph showing a change in insertion depth of a pushing bar at which the maximum ice-releasing force is generated, according to a hardness of the first tray. FIG. 24 is a perspective view of a first tray of a second embodiment of the present invention. FIG. 25 is a side view of the first tray. FIG. 26 is a cross-sectional view taken along line 26-26 of FIG. 24. FIG. 27 is a cross-sectional view taken along line 27-27 of FIG. 24. FIG. 28 is a front view of the first tray. FIG. 29 is a cross-sectional view taken along line 29-29 of FIG. 28. FIG. 30 is a perspective view of a first tray of a third embodiment of the present invention. FIG. 31 is a side view of the first tray. FIG. 32 is a plan view of the first tray. FIG. 33 is a bottom view of the first tray. FIG. 34 is a cross-sectional view taken along line 34-34 of FIG. 30. FIG. 35 is a cross-sectional view taken along line 35-35 of FIG. 30. FIG. 36 is a front view of the first tray. FIG. 37 is a cross-sectional view taken along line 37-37 of FIG. 36. FIG. 38 is a cross-sectional view taken along line 38-38 of FIG. 36. FIG. 39 is a perspective view of a first tray of a fourth embodiment of the present invention. FIG. 40 is a side view of the first tray. FIG. 41 is a cross-sectional view taken along line 41-41 of FIG. 39. FIG. 42 is a cross-sectional view taken along line 42-42 of FIG. 39. FIG. 43 is a front view of the first tray. FIG. 44 is a cross-sectional view taken along line 44-44 of FIG. 43. FIG. 45 is a cross-sectional view taken along line 45-45 of FIG. 43. FIG. 46 is a perspective view of a first tray of a fifth embodiment of the present invention. FIG. 47 is a side view of the first tray. FIG. 48 is a cross-sectional view taken along line 48-48 of FIG. 46. FIG. 49 is a cross-sectional view taken along line 49-49 of FIG. 46. FIG. 50 is a front view of the first tray. FIG. 51 is a cross-sectional view taken along line 51-51 of FIG. 50. FIG. 52 is a cross-sectional view taken along line 52-52 of FIG. 50. Detailed Description of the Invention

[0123] Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same components are given the same numerals as much as possible even if they are displayed on different drawings. In addition, in describing an embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function interferes with an understanding of the embodiment of the present invention, the detailed description thereof will be omitted.

[0124] In describing the components of the embodiment of the present invention, terms such as first, second, A, B, a, and b may be used. These terms are only for distinguishing the component from other components, and the essence, order, or sequence of the corresponding component is not limited by the term. When it is described that a component is "connected," "coupled," "supported," or "joined" to another component, the component may be directly "connected," "coupled," "supported," or "joined" to the other component, but it should be understood that another component may also be "connected," "coupled," "supported," or "joined" between each component.

[0125] Meanwhile, in describing the components of the embodiment of the present invention, the meaning of the description "at least one of components A and B" may be understood as including three embodiments meaning (1) A alone, (2) B alone, and (3) both A and B.

[0126] Also, in describing the components of the embodiment of the present invention, the meaning of the description "at least one of components A or B" may be understood as including three embodiments meaning (1) A alone, (2) B alone, and (3) both A and B. That is, the meaning of the description "at least one of components A or B" may be the same as the meaning of the description "at least one of components A and B."

[0127] The refrigerator according to an embodiment of the present invention may include a storage space where items (for example, food, medicine, etc.) are stored. The refrigerator may include a door for opening and closing the storage space. In the refrigerator, the items may be stored in a refrigerated or frozen state. The refrigerator may include an ice-making space in which at least a part of an ice maker to be described later is disposed. The ice-making space may be provided in the storage space and / or the door.

[0128] An ice maker according to an embodiment of the present invention may include a cell which is a space where the item (for example, water) undergoes a phase change into ice. The ice maker may include a tray assembly. The tray assembly may include a tray, a tray case, or both the tray and the tray case. The tray may include a wall forming at least a part of the cell. The tray case may include a wall connected to the tray, coupled to the tray, supported by the tray, or surrounding at least a part of the tray. The tray case may include at least one of a tray cover or a tray supporter. The tray assembly may include a first tray assembly and a second tray assembly. The first tray assembly may include a first tray, a first tray case, or both the first tray and the first tray case. The first tray may include a wall forming a first part of the cell. The first tray case may include a wall connected to the first tray, coupled to the first tray, supported by the first tray, or surrounding at least a part of the first tray. The first tray case may include at least one of a first tray cover or a first tray supporter. The second tray assembly may include a second tray, a second tray case, or both the second tray and the second tray case. The second tray may include a wall forming a second part of the cell. The second tray case may include a wall connected to the second tray, coupled to the second tray, supported by the second tray, or surrounding at least a part of the second tray. The second tray case may include at least one of a second tray cover or a second tray supporter. The ice maker may include a bracket. The bracket may cover at least a part of the tray assembly or accommodate at least a part of the tray assembly.

[0129] The ice maker and / or the refrigerator may include a pusher. The pusher may be provided to press the ice and / or the tray assembly so that the ice is separated from the tray assembly. The pusher may include a first edge on which a surface for pressing the ice and / or the tray assembly is formed. The pusher may include a bar extending from the first edge. The pusher may include a second edge located at an end of the bar.

[0130] A pressing part that the pusher presses may be formed on the tray assembly, and the pusher may be configured to apply pressure to one surface of the tray assembly. The pusher may be defined as a non-penetrating pusher.

[0131] The first edge of the pusher may move along a surface of a tray defining at least a part of the cell from a first point outside the cell. The pusher may be defined as a movable pusher. The pusher may be connected to a driving part, a rotation shaft of the driving part, or a tray assembly movable by being connected to the drive part.

[0132] The pusher may additionally press the pressing part after contacting the pressing part at the first point outside the cell. The pusher may be coupled to a fixed end. The pusher may be defined as a fixed pusher.

[0133] The ice maker and / or the refrigerator may include a heater. The heater (for example, a wire heater, a cord heater, a radiant heater, etc.) may supply heat to the cell and / or the storage space. The heater may contact the tray assembly and / or the cell to directly supply heat. The heater may supply heat indirectly (for example, hot or warm air) in a state where the heater is not connected to the tray assembly and / or the cell.

[0134] The ice maker and / or the refrigerator may include a cooler (for example, an evaporator, a refrigerant pipe, a refrigerant valve, a fan, a damper, a thermoelectric module, etc.). The cooler may contact the tray assembly and / or the cell to directly supply cold. The cooler may supply heat (for example, cold or cold air) indirectly in a state where the cooler is not connected to the tray assembly and / or the cell.

[0135] The ice maker and / or the refrigerator may include a temperature sensor. The temperature sensor may be provided to detect a temperature of an item (for example, water) or ice in the cell.

[0136] The ice maker and / or the refrigerator may include a driving device. The driving device may be connected to the tray assembly and / or the pusher.

[0137] The refrigerator of the present invention may include a tray assembly forming a part of a cell which is a space where water undergoes a phase change into ice, a cooler for supplying cold to the cell, a water supply part for supplying water to the cell, and a controller.

[0138] The controller, after moving the tray assembly to an ice-making position, may control the cooler so that cold air is supplied to the cell. After the generation of ice in the cell is completed, the controller may control the tray assembly to move in a forward direction to an ice-releasing position in order to take out the ice from the cell. After ice-releasing is completed, the controller may control the tray assembly to move in a reverse direction to a water supply position and then control water supply to start. After the water supply is completed, the controller may control the tray assembly to move to the ice-making position.

[0139] In the present invention, the cell is located inside the storage space and may be defined as a space where water undergoes a phase change into ice. A circumference of the cell is independent of a shape of the cell and means an outer surface of the cell. In another aspect, an outer peripheral surface of the cell may mean an inner surface of a wall forming the cell.

[0140] In the present invention, a tray may be defined as a wall that partitions the cell and the inside of the storage space. The tray may be defined as a wall forming at least a portion of the cell. A plurality of trays may be present. The plurality of trays may contact each other.

[0141] In the present invention, the refrigerator may include at least one tray assembly in which the heater is disposed. The heater may be disposed near the tray assembly to heat a cell formed by the tray assembly. The heater may include a heater (hereinafter referred to as a "transparent ice heater") controlled to be turned on during at least a part of a period while the cooler supplies cold so that bubbles dissolved in water inside the cell move from a portion where ice is generated toward water in a liquid state to generate transparent ice. The heater may include a heater (hereinafter referred to as an "ice-releasing heater") controlled to be turned on during at least a part of a period after ice making is completed so that ice may be easily separated from the tray assembly.

[0142] In the present invention, the cell may be cooled by the cooler that cools the storage space. For example, the storage space where the cell is located is a freezing space that may be controlled at a temperature lower than 0 degrees, and the cell may be cooled by a cooler that cools the freezing space. The cell may be located in a door that opens and closes the storage space.

[0143] In the present invention, a degree of internal deformation resistance indicates a degree to which an object resists deformation caused by an external force applied to the object, and is defined as a value determined by a shape including a thickness of the object, a material of the object, and the like. For example, the external force may include pressure applied to the tray assembly in a process in which water inside the cell solidifies and expands. As another example, the external force may include pressure applied by a pusher for separating ice from the tray assembly to the ice or a portion of the tray assembly. As another example, when a plurality of trays are coupled, the external force may include pressure applied by the coupling.

[0144] Meanwhile, from the perspective of the material of the object, a high internal deformation resistance of the object may mean that the stiffness of the object is high. The thermal conductivity may be an inherent material characteristic of the object. Even when the material of the object is the same, the internal deformation resistance may vary depending on the shape of the object or the like. The internal deformation resistance may be affected by an internal deformation reinforcing part extending in a direction in which the external force is applied. As the stiffness of the internal deformation reinforcing part increases, the internal deformation resistance may increase. As the height of the extended internal deformation reinforcing part increases, the internal deformation resistance may increase.

[0145] In the present invention, a degree of restoration indicates a degree to which an object deformed by an external force is restored to the shape of the object before the external force was 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, and the like.

[0146] Hereinafter, specific embodiments of the refrigerator of the present invention will be described with reference to the drawings.

[0147] FIG. 1 is a view showing a refrigerator according to an embodiment of the present invention.

[0148] Referring to FIG. 1, a refrigerator according to an embodiment of the present invention may include a cabinet 14 including a storage space and a door for opening and closing the storage space.

[0149] The storage space may include a refrigerating space 18 and a freezing space 32. The refrigerating space 18 is disposed at an upper side, and the freezing space 32 is disposed at a lower side, so that each storage space may be individually opened and closed by each door. As another example, it is also possible that the freezing space is disposed at the upper side and the refrigerating space is disposed at the lower side. Alternatively, it is also possible that the freezing space is disposed on one of the left and right sides and the refrigerating space is disposed on the other side.

[0150] The freezing space 32 may be divided into first and second spaces (for example, a lower space and an upper space), and a drawer 40 that may be moved in and out of the first space may be provided in the first space.

[0151] The door may include a plurality of doors 10, 20, 30 for opening and closing a refrigerating space 18 and a freezing space 32. The plurality of doors 10, 20, 30 may include some or all of doors 10, 20 for opening and closing the storage space in a rotating manner and a door 30 for opening and closing the storage space in a sliding manner.

[0152] The freezing space 32 may be provided to be separated into two spaces even if the freezing space 32 may be opened and closed by one door 30. In this embodiment, the freezing space 32 may be referred to as a first storage space, and the refrigerating space 18 may be referred to as a second storage space.

[0153] An ice maker 200 capable of manufacturing ice may be provided in the freezing space 32. The ice maker 200 may be located, for example, in a partial space (for example, an upper space) of the freezing space 32.

[0154] An ice bin 600 in which ice produced in the ice maker 200 is dropped and stored may be disposed at one side (for example, a lower side) of the ice maker 200. A user may take out the ice bin 600 from the freezing space 32 and use the ice stored in the ice bin 600. The ice bin 600 may be coupled to one side (for example, an upper side) of a wall partitioning a first space (for example, a lower space) and a second space (for example, an upper space) of the freezing space 32.

[0155] Although not shown, the cabinet 14 is provided with a duct for supplying cold to the ice maker 200 (not shown). The duct guides cold heat-exchanged with refrigerant flowing through an evaporator toward the ice maker 200. For example, the duct is disposed at one side (for example, a rear side) of the cabinet 14 and may discharge cold toward the other side (for example, a front side) of the cabinet 14. The ice maker 200 may be located at one side (for example, a front side) of the duct. Without being limited, an outlet of the duct may be provided on one or more of a first side wall (for example, a rear side wall) and a second side wall (for example, an upper side wall) of the freezing space 32.

[0156] Although it has been described above that the ice maker 200 is provided in the freezing space 32, a space where the ice maker 200 may be located is not limited to the freezing space 32, and the ice maker 200 may be located in various spaces as long as cold may be supplied. Therefore, hereinafter, it will be described that the ice maker 200 is located in the storage space.

[0157] FIG. 2 is a perspective view illustrating an ice maker according to a first embodiment of the present invention, and FIG. 3 is an exploded perspective view of the ice maker according to the first embodiment of the present invention.

[0158] Referring to FIGS. 2 and 3, the ice maker 200 according to the first embodiment of the present invention may include a bracket 220 for supporting a tray assembly. Each component of the ice maker 200 may be provided inside or outside the bracket 220, so that the ice maker 200 may constitute one assembly.

[0159] The bracket 220 may be coupled to at least one surface of the storage space. The bracket 220 may include a first wall 221 in which a through-hole 226 is formed. At least a portion of the first wall 221 may extend in a first direction (for example, a horizontal direction) and may be coupled to one surface of the storage space.

[0160] The bracket 220 may include two second walls 222 extending in one direction (for example, downward) from both sides of the first wall 221. A space between the two second walls 222 may form a space where the tray assembly and the driving part 510 are disposed.

[0161] One of the two second walls 222 may cover the driving part 510. The other of the two second walls 222 may function as a prevention plate for preventing ice falling into the ice bin 600 or ice stored in the ice bin 600 from falling out, and may form a wall through-hole 222a of which at least a portion is penetrated to prevent frost formation.

[0162] The bracket 220 may include a third wall 223 protruding from the first wall 221. The third wall 223 may protrude from the first wall 221 in a direction toward the storage space.

[0163] The third wall 223 may include a first part 223a extending in a direction corresponding to one direction (for example, a front-rear direction) of the storage space and a second part 223b extending in another direction (for example, a left-right direction) from one end (for example, a front end) of the first part 223a.

[0164] The third wall 223 may include a hook 223c coupled to one surface (for example, an upper surface) of the storage space. For example, the hook 223c may be provided on the second part 223b.

[0165] A water supply part 240 may be coupled to the second part 223b. The water supply part 240 includes a hook 248, and the hook 248 may be caught at one end (for example, an upper end) of the second part 223b.

[0166] The bracket 220 may be formed with a suction hole 224a through which cold of the storage space is introduced toward the tray assembly. The suction hole 224a may be formed in a side wall of the bracket 220. For example, the suction hole 224a may be formed in a space between the second wall 222 and the third wall 223. From another aspect, the suction hole 224a may be formed by penetrating at least a part of the second wall 222.

[0167] Cold air may be sucked from one side of the bracket 220 toward the tray assembly through the suction hole 224a to act as cold air for ice-making.

[0168] The first wall 221 may include a through-hole functioning as an outlet through which cold air that has passed through the tray assembly is discharged. A plurality of through-holes may be formed.

[0169] The bracket 220 may include a guide wall 225 that guides the cold sucked through the suction hole 224a toward the tray assembly. The guide wall 225 may extend from the third wall 223 toward a center of the bracket 220.

[0170] For example, the guide wall 225 may include a portion extending roundly from the third wall 223 toward the cell 360. The cell 360 may be disposed closer to the other end (for example, a front end) than to one end (a rear end).

[0171] The bracket 220 may include a blocking plate 227a that prevents the cold sucked through the suction hole 224a from being discharged from the bracket 220 without heading toward the tray assembly. As an example, the blocking plate 227a may extend in one direction (for example, upward) from the first wall 221.

[0172] The ice maker 200 may include a first tray assembly and a second tray assembly.

[0173] The first tray assembly may include a first tray 400, may include a first tray case, or may include the first tray 400 and the first tray case. For example, in the present embodiment, the first tray assembly may include the first tray 400.

[0174] The second tray assembly may include the second tray 300 and a second tray case. The second tray case may include at least one of a second tray supporter or a second tray cover.

[0175] The bracket 220 may define at least a part of a space accommodating the first tray assembly and the second tray assembly.

[0176] The bracket 220 may be disposed, for example, on one side wall (for example, an upper side wall) of the freezing space 32. A water supply part 240 may be disposed on the bracket 220. The water supply part 240 may guide water supplied from one side (for example, an upper side) to the other side (for example, a lower side) of the water supply part 240. A water supply pipe (not shown) through which water is supplied may be disposed at one side (for example, an upper side) of the water supply part 240.

[0177] The water supply part 240 may be supported by the bracket 220. The water supply part 240 may include a hook 248 coupled to the bracket 220. As an example, the hook 248 may be caught on the second part 223b of the bracket 220.

[0178] The ice maker 200 may include a cell (refer to 360 of FIG. 4) which is a space where water undergoes a phase change into ice by cold air. The first tray 400 may form at least a portion of the cell 360. The second tray 300 may form another portion of the cell 360. The cell 360 may include a first cell formed by the first tray 400 and a second cell formed by the second tray 300.

[0179] The second tray 300 may be coupled to the bracket 220. The first tray 400 may be disposed to be relatively movable with respect to the second tray 300. The first tray 400 may perform a linear motion or a rotational motion.

[0180] In an ice-making process, the first tray 400 moves with respect to the second tray 300, so that the second tray 300 and the first tray 400 may contact each other. When the second tray 300 and the first tray 400 contact each other, the cell 360 may be defined.

[0181] In an ice-releasing process after completion of ice-making, the first tray 400 moves with respect to the second tray 300, so that the first tray 400 may be spaced apart from the second tray 300.

[0182] In the present embodiment, the second tray 300 and the first tray 400 may be arranged in one direction (for example, an up-and-down direction) while the cell 360 is formed. Accordingly, the second tray 300 may be referred to as an upper tray, and the first tray 400 may be referred to as a lower tray.

[0183] A plurality of cells 360 may be defined by the second tray 300 and the first tray 400. For example, the plurality of cells 360 may include three cells 360.

[0184] When water is cooled by the cold while water is supplied to the cell 360, ice of the same or similar shape as the cell 360 may be generated. As an example, the cell 360 may be formed in a spherical shape or a shape similar to a sphere. Of course, it is also possible that the cell 360 is formed in a rectangular parallelepiped shape or a polygonal shape.

[0185] The second tray 300 may include a plurality of tray parts 300a, 300b and 300c. The number of the plurality of tray parts 300a, 300b and 300c may correspond to the number of the plurality of cells 360.

[0186] Each of the tray parts 300a, 300b and 300c may form at least a portion of one cell. Based on the total surface area of one cell 360, the surface area of a portion of the cell formed by each of the tray parts may be smaller than the surface area of another portion of the cell formed by the first tray 400.

[0187] The first tray case may include, for example, a first tray cover 480 and a first tray supporter 450. The first tray 400, the first tray supporter 450, and the first tray cover 480 may be coupled by a fastening member 457.

[0188] At least a portion of the first tray cover 480 may be located at one side (for example, an upper side) of the first tray 400. The first tray cover 480 may include a cover wall 481 forming an opening 482. The cover wall 481 may be placed on one side (for example, an upper side) of a first extension wall 420 (refer to FIG. 6) of the first tray 400.

[0189] A contact protrusion 428 contacting the first tray cover 480 may be provided on the first extension wall 420. The contact protrusion 428 may extend in one direction (for example, upward) from the first extension wall 420.

[0190] An insertion hole 481a into which the contact protrusion 428 is inserted may be formed in the cover wall 481 of the first tray cover 480. The contact protrusion 428 may contact the stopper 250. In a process in which the first tray 400 moves to the ice-making position, the contact protrusion 428 is pressed by the stopper 250, so that the tightness of the first and second trays 300, 400 may be improved.

[0191] The opening 482 may be formed such that at least a portion of the first tray cover 480 is penetrated so that at least a portion of the first tray 400 passes through the opening 482. The opening 482 may be formed to have a predetermined curvature corresponding to a shape of an outer peripheral surface of the cell 360.

[0192] The first tray cover 480 may include a cover fastening part 485 protruding in one direction (for example, downward) from the cover wall 481. A plurality of cover fastening parts 485 may be provided along a periphery of one surface (for example, a bottom surface) of the cover wall 481. The cover fastening part 485 may be coupled to at least one of a fastening part 425 (refer to FIG. 6) of the first tray 400 or a supporter fastening part 456 of the first tray supporter 450.

[0193] At least a portion of the first tray supporter 450 may be located at one side (for example, a lower side) of the first tray 400. The first tray supporter 450 may support the first tray 400 at one side (for example, a lower side) of the first tray 400. At least a portion of a wall forming a first cell of the first tray 400 may be supported by the first tray supporter 450.

[0194] The first tray 400 may include a peripheral wall 430 (refer to FIG. 6) surrounding a portion of the second tray 300 in a state of contacting the second tray 300.

[0195] The ice maker 200 may include a driving part 510 providing a driving force. The first tray 400 may relatively move with respect to the second tray 300 by receiving the driving force of the driving part 510.

[0196] The first tray supporter 450 may include two extension parts 455 in which a through-hole 455a is formed. The two extension parts 455 may be provided at both side portions of the first tray supporter 450. The ice maker 200 may include a shaft 520 passing through the through-hole 455a. The shaft 520 extends between the two extension parts 455 and may be rotated by receiving power from the driving part 510.

[0197] The first tray supporter 450 may include two first walls 451 forming both side surfaces. The two extension parts 455 may be respectively provided at one end (for example, a rear end) of the first wall 451.

[0198] The first tray supporter 450 may include a second wall 452 connecting the other ends (for example, front ends) of the two first walls 451. The second wall 452 may form a first surface part (for example, a front part) of the first tray supporter 450.

[0199] The first tray supporter 450 may include a third wall 453 forming a second surface part (for example, an upper surface part) of the first tray supporter 450. The first extension wall 420 (refer to FIG. 6) of the first tray 400 may be seated on the third wall 453.

[0200] A coupling part 459 to which a first edge 422a (refer to FIG. 16) of the first tray 400 is coupled may be formed on the third wall 453. The coupling part 459 may include a through-hole so that the first edge 422a is inserted.

[0201] An insertion part 458a to which a second edge 422b (refer to FIG. 16) of the first tray 400 is coupled may be formed on the third wall 453. The insertion part 458a may include a groove recessed from the third wall 453 so that the second edge 422b is inserted.

[0202] The first tray supporter 450 may include at least one of a fourth wall 454 or a fifth wall 458 extending in one direction (for example, downward) from the third wall 453. The fourth wall 454 may be one side wall (for example, a rear wall) of the first tray supporter 450. The fifth wall 458 may be understood as an internal wall spaced apart from the fourth wall 454 in another direction (for example, forward).

[0203] The insertion part 458a may be a space formed between the fourth wall 454 and the fifth wall 458.

[0204] The first tray supporter 450 may have an accommodating space 453a recessed in one direction (for example, downward) from the third wall 453. A portion of the first cell of the first tray 400 may be accommodated in the accommodating space 453a.

[0205] A transparent ice heater 490 for applying heat to the first tray 400 during an ice-making process may be disposed in the accommodating space 453a. The transparent ice heater 490 may be disposed to be adjacent to or in contact with one side (for example, a lower side) of the first tray 400 so as to supply heat to a portion (for example, a lower portion) of the first tray 400. The transparent ice heater 490 may be a wire-type heater.

[0206] The first tray supporter 450 may include a fourth wall 454 forming a third surface part (for example, a rear surface part) of the first tray supporter 450. An outer surface of the first tray supporter 450 may be defined by the first to fourth walls 451, 452, 453 and 454.

[0207] Holders 530 may be provided at both ends of the shaft 520. The holder 530 may include a first holder 531 connecting the shaft 520 and the driving part 510. The first holder 531 is coupled to one end of the shaft 520 and may be disposed between the extension part 455 and the driving part 510.

[0208] The first holder 531 includes an open end so that the shaft 520 passes through the open end, and the shaft 520 may pass through the first holder 531 to be coupled to the driving part 510.

[0209] The holder 530 may include a second holder 532 coupled to the other end of the shaft 520. The second holder 532 is disposed outside the extension part 455, and the shaft 520 may pass through the through-hole 455a and be supported by the second holder 532.

[0210] The driving part 510 may include a motor and a plurality of gears.

[0211] A full-ice detection lever 550 may be connected to the driving part 510. The full-ice detection lever 550 is moved by power provided from the driving part 510, and may detect ice stored in the ice bin 600 while the lever 550 is being moved.

[0212] The driving part 510 may include a cam that is rotated or moved by receiving power from the motor. The ice maker 200 may include a sensor for detecting rotation or movement of the cam.

[0213] A controller of the refrigerator may identify a position of the first tray 400 (or the first tray assembly) based on a type and a pattern of a signal output from the sensor. That is, since the first tray 400 and the cam are moved by the motor, a water supply position, an ice-making position, and an ice-releasing position of the first tray 400 may be distinguished and determined based on a detection signal of a magnet provided on the cam.

[0214] The ice maker 200 may further include a pusher 540. The pusher 540 may be disposed, for example, on the bracket 220.

[0215] The pusher 540 may include a coupling plate 542 coupled to the bracket 220 and at least one pushing bar 544 extending from the coupling plate 542. As an example, the pusher 540 may include pushing bars 544 provided in the same number as the number of the cells 360, but is not limited thereto.

[0216] The pushing bar 544 may push the ice located in the cell 360. For example, the pushing bar 544 may pass through the first tray supporter 450 to contact the first tray 400 forming the cell 360, and may press the contacted first tray 400.

[0217] The first tray 400 may be formed of a non-metallic material. For example, the first tray 400 may be formed of a flexible or soft material that may be deformed when pressed by the pusher 540. Although not limited, the first tray 400 may be formed of, for example, a silicone material.

[0218] While the first tray 400 is being pressed by the pusher 540, the first tray 400 is deformed, so that the pressing force of the pusher 540 may be transmitted to the ice. The ice and the first tray 400 may be separated by the pressing force of the pusher 540.

[0219] When the first tray 400 is formed of a non-metallic material and a flexible or soft material, a coupling force or an adhesive force between the ice and the first tray 400 may be reduced, so that the ice may be easily separated from the first tray 400.

[0220] When the first tray 400 is formed of a non-metallic material and a flexible or soft material, after the shape of the first tray 400 is deformed by the pusher 540, if the pressing force of the pusher 540 is removed, the first tray 400 may be easily restored to its original shape.

[0221] For example, the second tray 300 may be formed of a metallic material or a plastic material. In this case, a coupling force or an adhesive force per unit area between the second tray 300 and the ice may be relatively strong. However, since the cell formed inside the second tray 300 has a small surface area (or ice contact area), ice-releasing may be easily performed.

[0222] As another example, the second tray 300 may be formed of a non-metallic material. In this case, the coupling force or the adhesive force per unit area between the second tray 300 and the ice may be relatively weak. Accordingly, the ice-releasing of the ice may be easily performed. Although not limited, the second tray 300 may be formed of, for example, a silicone material.

[0223] The second tray 300 and the first tray 400 may be formed of the same material. In this case, a hardness of the second tray 300 and a hardness of the first tray 400 may be different so that sealing performance is maintained at a contact portion between the second tray 300 and the first tray 400.

[0224] In the case of the present embodiment, since the first tray 400 is pressed and deformed by the pusher 540, the hardness of the first tray 400 may be lower than the hardness of the second tray 300 to facilitate shape deformation of the first tray 400.

[0225] FIG. 4 is a cross-sectional view of an ice maker according to a first embodiment of the present invention.

[0226] Referring to FIG. 4, the second tray 300 according to the first embodiment of the present invention may be coupled to a bracket 220. The bracket 220 may include a coupling wall 221a coupled to the second tray 300. The coupling wall 221a may be stepped in one direction (for example, downward) from a first wall 221 forming one surface (for example, an upper surface) of the bracket 220.

[0227] The second tray 300 may be fastened to the coupling wall 221a by a predetermined fastening member. A fastening groove 325 to which the fastening member is coupled may be formed in a portion (for example, an upper portion) of the second tray 300.

[0228] The bracket 220 may include a support wall 229 for supporting the second tray 300. The support wall 229 may extend in one direction (for example, downward) from the coupling wall 221a and may be configured to support a guide wall 320 of the second tray 300.

[0229] The second tray 300 includes a plurality of tray parts 300a, 300b and 300c, and the plurality of tray parts may be spaced apart from each other in one direction (for example, a left-right direction).

[0230] The second tray 300 may form a through-hole 323 that guides air to escape to the outside of the cell at an ice-making position. The through-hole 323 may be formed such that at least a portion of the second tray 300 is penetrated in one direction (for example, an up-and-down direction). The through-hole 323 may be formed in a portion (for example, an upper portion) of the second tray 300.

[0231] A water supply part 240 may be coupled to an upper portion of the bracket 220. A storage space 241 in which fluid is stored may be formed inside the water supply part 240. A first portion of the water supply part 240 may be located at an outer side of the tray assembly and supported by the bracket 220. For example, the first portion may form a portion (for example, an upper portion) of the water supply part 240.

[0232] A second portion of the water supply part 240 may be located at an inner side of the tray assembly to supply fluid to the cell 360. For example, the second portion may form another portion (for example, a lower portion) of the water supply part 240. When the fluid is supplied, the tray assembly may be in a water supply position.

[0233] A discharge part 243 for discharging fluid may be formed in the water supply part 240. The discharge part 243 may be formed at one end (for example, a lower end) of the water supply part 240. The discharge part 243 may include a discharge opening so as to discharge fluid.

[0234] In the ice-making position of the tray assembly, the second tray 300 and the first tray 400 may contact each other to form a cell 360 corresponding to a desired shape of ice.

[0235] The inner peripheral surface of the cell 360 may include a first cell surface 410a formed by the first tray 400 and a second cell surface 310a formed by the second tray 300. The first cell surface 410a and the second cell surface 310a may extend in a circumferential direction to form the cell 360.

[0236] Based on a center C1 of the cell 360, a diameter D1 of the cell 360 may be greater than a diameter D2 of a portion where the first cell surface 410a and the second cell surface 310a contact. The portion where the first cell surface 410a and the second cell surface 310a contact may be understood as a boundary between the second tray 300 and the first tray 400.

[0237] The diameter D2 may form a diameter of an opening 313 of the second tray 300. The opening 313 of the second tray 300 may form one end (for example, a lower end) of the second tray 300. The diameter D2 may form a diameter of an opening 413 of the first tray 400. The opening 413 of the first tray 400 may form one end (for example, an upper end) of the first tray 400.

[0238] From one perspective, the second tray 300 may be understood as functioning as a cover member that covers the opening of the first tray 400.

[0239] Based on the center C1 of the cell 360, a circumferential length of the first cell surface 410a may be formed to be less than a circumferential length of the second cell surface 310a. Based on the center C1 of the cell 360, a central angle formed by the first cell surface 410a may be formed to be less than a central angle formed by the second cell surface 310a.

[0240] When defining a horizontal (X-axis) diameter D1 and a vertical (Z-axis) diameter D3 of the cell 360, the diameter D1 and the diameter D3 may be formed to be the same to implement a spherical cell. As another example, the diameter D3 may be formed to be greater than the diameter D1 to implement an elliptical cell having a major axis in one direction (for example, a vertical direction). Since the cell is configured in an elliptical shape, the diameter D1 in a direction perpendicular to an ice-releasing direction (Z-axis direction) is formed to be less than the diameter D3 corresponding to the ice-releasing direction, so that ice-releasing torque may be reduced.

[0241] FIG. 5 is a view showing a tray assembly according to a first embodiment of the present invention, FIG. 6 is a view showing a first tray according to the first embodiment of the present invention, FIG. 7 is a side view of the first tray, FIG. 8 is a plan view of the first tray, and FIG. 9 is a bottom view of the first tray.

[0242] Referring to FIGS. 3, 4 and 5 to 9 together, a tray assembly according to the first embodiment of the present invention may include a first tray 400 and a second tray 300. The first tray 400 may define a first cell 410b which is a portion of the cell 360.

[0243] The second tray 300 may include a second tray wall 310 forming a portion of the cell 360. For example, the second tray wall 310 may define the second cell 310b. An inner peripheral surface of the second tray wall 310 forms a second cell surface 310a, and the second cell surface 310a may be understood as defining an outer peripheral surface of the second cell 310b.

[0244] The second tray 300 may include a plurality of tray parts 300a, 300b and 300c, each of the plurality of tray parts 300a, 300b and 300c defining the second cell 310b. The plurality of second cells 310b may be arranged in one direction (for example, an X-axis direction) based on FIG. 8.

[0245] The second tray 300 may include a second opening 313. The second opening 313 forms one end (for example, a lower end) of the second tray 300 and may contact the first tray 400.

[0246] The second tray 300 may include a guide wall 320 extending from the second tray wall 310. For example, the guide wall 320 may extend in one direction (for example, upward) from the second tray wall 310.

[0247] The guide wall 320 may form a through-hole 323. The through-hole 323 may be formed to penetrate from the inner peripheral surface of the second tray wall 310, that is, the second cell surface 310a, to the outer surface of the guide wall 320.

[0248] A first end, that is, an inlet-side end of the through-hole 323 may be connected to the second cell surface 310a. A second end, that is, a discharge-side end of the through-hole 323 may be connected to one end (for example, an upper end) of the guide wall 320. During an ice-making process, bubbles in the cell 360 are discharged through the through-hole 323, so that an air pocket phenomenon of the cell 360 may be prevented.

[0249] The guide wall 320 may include a drainage part 324 connected to the through-hole 323 and penetrating in one direction (for example, forward) of the guide wall 320. The drainage part 324 sends fluid discharged through the through-hole 323 to the outside of the second tray 300 to prevent residual ice from being formed in the through-hole 323. The drainage part 324 may include a drainage hole.

[0250] The guide wall 320 may have a fastening part 325 to which a fastening member is coupled. The fastening part 325 may be configured as a fastening groove recessed from one end (for example, an upper end) of the guide wall 320. The fastening member may be coupled to the bracket 220 and / or fastened to the fastening part 325 to couple the second tray 300 to the bracket 220.

[0251] The first tray 400 may define a first cell 410b which is another portion of the cell 360. The first tray 400 may include a first tray wall 410 forming another portion of the cell 360. For example, the first tray wall 410 may define the first cell 410b. The first tray wall 410 may be named a "cell wall."

[0252] An inner peripheral surface of the first tray wall 410 forms a first cell surface 410a, and the first cell surface 410a may be understood as defining an outer peripheral surface of the first cell 410b. For example, the first tray 400 may define a plurality of first cells 410b. The plurality of first cells 410b may be arranged in one direction (for example, an X-axis direction) based on FIG. 9.

[0253] To define the plurality of first cells 410b, a plurality of first tray walls 410 are provided, and each of the plurality of first tray walls 410 may be arranged in one direction (for example, an X-axis direction).

[0254] The first tray 400 may include a first opening 413. The first opening 413 forms one end (for example, an upper end) of the first tray 400 and may contact the second tray 300.

[0255] The first tray 400 may include a first extension wall 420 extending in a first direction (for example, a horizontal direction) toward the outside of the first tray wall 410. The first extension wall 420 may be seated on the third wall 453 of the first tray supporter 450.

[0256] A plurality of first tray walls 410 defining the plurality of first cells 410b are provided, and the first extension wall 420 may extend to the outside of the plurality of first tray walls 410. For example, the first extension wall 420 may include a rectangular planar wall.

[0257] The first extension wall 420 may be formed at a position through which an extension line in the first direction (for example, a horizontal direction) bisecting a height in a second direction (for example, a vertical direction) of the cell 360 passes. When defining the center C1 of the cell 360, the extension line in the first direction (for example, a horizontal direction) passing through the center C1 may pass through the first extension wall 420.

[0258] The first tray wall 410 may include a first part 411 located at one side (for example, a lower side) of the first extension wall 420 with respect to the first extension wall 420. The first part 411 may form one region (for example, a lower region) of the cell 360.

[0259] One end (for example, a lower end) of the first part 411 may form a recessed part 411a. As water expands during an ice-making process, the recessed part 411a may be deformed (expanded) into a desired shape of the cell.

[0260] The first part 411 may be accommodated in the accommodating space 453a of the first tray supporter 450 and supported by the first tray supporter 450.

[0261] The first tray wall 410 may include a second part 412 located at the other side (for example, an upper side) of the first extension wall 420 with respect to the first extension wall 420. The second part 412 may form a portion of another region (for example, an upper region) of the cell 360.

[0262] One end (for example, an upper end) of the second part 412 may form the first opening 413. The second part 412 may be understood as a portion that is not accommodated in the accommodating space 453a.

[0263] The first part 411 and the second part 412 may be integrally formed.

[0264] The first part 411 is provided with a sensor bracket 414 for coupling a temperature sensor that detects a temperature of the cell 360. For example, the sensor bracket 414 may be disposed to connect two adjacent first parts 411 among a plurality of first parts 411.

[0265] From one perspective, the first tray wall 410 may include a plurality of walls having different degrees of internal deformation resistance. The degree of internal deformation resistance indicates a degree of resisting deformation against an external force including gravity, and may be a value determined by a material, a shape, a thickness, and the like of the first tray. The degree of internal deformation resistance may be understood as a factor indicating stiffness, elastic modulus, hardness, or flexibility.

[0266] The plurality of walls may include a first wall forming the second part 412 and a second wall forming the first part 411. Hereinafter, description will be made from the perspective of the first wall 412 and the second wall 411.

[0267] The first wall 412 may include a portion having a less degree of internal deformation resistance than the second wall 411. The first wall 412 of the first tray 400 may include a portion having a less degree of internal deformation resistance in a first direction than the second wall 411 of the first tray 400. For example, the portion having a little degree of internal deformation resistance may include a first region 412a. The first direction may be a radial direction of the cell 360.

[0268] The first wall 412 of the first tray 400 may include a portion having a less degree of internal deformation resistance in a second direction than the second wall of the first tray 400. For example, the portion having a little degree of internal deformation resistance may include the first region 412a.

[0269] The second direction may be a direction in which a material located in the cell 360 is discharged from an internal space of the first tray 400 to an external space of the first tray 400 through the opening 413 of the first tray 400. For example, the second direction may be a direction in which ice-releasing of ice is performed (an ice-releasing direction). For example, the second direction may be a direction perpendicular to the first direction.

[0270] The first wall 412 of the first tray 400 may include a portion in which the degree of internal deformation resistance in the first direction is less than the degree of internal deformation resistance in the second direction. According to such a configuration, deformation in the first direction is relatively large and deformation in the second direction is relatively small, so that ice-releasing in the second direction may be easily performed.

[0271] In the first wall 412 of the first tray 400, the degree of internal deformation resistance in the first direction may vary along the second direction, and at this time, a rate of change of the internal deformation resistance in the first direction may have a first value.

[0272] In the first wall 412 of the first tray 400, the degree of internal deformation resistance in the second direction may vary along the first direction, and at this time, a rate of change of the internal deformation resistance in the second direction may have a second value. The first value may be greater than the second value.

[0273] The plurality of walls may include a first wall 412 having a first degree of internal deformation resistance and a second wall 411 having a second degree of internal deformation resistance. The internal deformation resistance of at least a portion of the first wall 412 may be less than the internal deformation resistance of the second wall 411. From another perspective, the first tray 400 may include portions having different thicknesses.

[0274] The first wall 412 of the first tray 400 may include a first region 412a having a first thickness and a second region 412b having a second thickness greater than the first thickness. In the first wall 412 of the first tray 400, a ratio occupied by the first region among a total region combining the first region and the second region may be formed to be greater than that of the second wall 411 of the first tray 400.

[0275] In the first wall 412 of the first tray 400, the ratio occupied by the first region among the total region combining the first region and the second region may increase as it gets closer to the opening in the second direction. For example, the first region may have a shape of a triangle, a rhombus, an arc, or an inverted Y-shape.

[0276] In the second region, a length in a circumferential direction at a first portion of the first wall may be less than a length in the circumferential direction at a second portion further from the opening 413 at the first wall than the first portion. For example, the second region may have a shape of a triangle, a rhombus, an arc, or an inverted Y-shape. That is, the circumferential length of the second region may decrease toward the opening 413.

[0277] As shown in FIG. 10, when an extension line ℓ1 passing through a first rib 412b1 forming the second region in the circumferential direction is defined, a circumferential length of any one first rib 412b1 closer to the opening 413 based on the extension line ℓ1 may be less than a circumferential length of another first rib 412b1. For example, the one first rib 412b1 may be an upper-side first rib, and the other first rib 412b1 may be a lower-side first rib.

[0278] Based on the circumferential direction of the extension line ℓ1, the first region 412a and the second region 412b of the first wall 412 may be alternately disposed.

[0279] The second region may include a first rib 412b1 extending in the first direction and a second rib 412b2 extending in the second direction. The first rib 412b1 forms a portion of the second region and may extend in the circumferential direction.

[0280] The second rib 412b2 forms a portion of the second region and may extend in the second direction from one point of the first rib 412b1. The second rib 412b2 may be named a "reinforcing rib."

[0281] The first and second regions may be formed together. For example, the first and second regions may be formed together by a method such as sheet metal forming or injection molding. Alternatively, after the first and second regions of the first wall 412 are respectively pre-formed, the first region and the second region may be coupled.

[0282] After the first wall 412 is pre-formed, a portion of the first wall may be additionally coupled to a portion of the first tray, so that the first and second regions of the first tray may be formed as distinct regions. For example, an embossed rib that increases the thickness, such as an addition, may be additionally coupled.

[0283] After the first wall 412 is pre-formed, a portion of the first tray may be removed, so that the first and second regions of the first tray may be formed as distinct regions. For example, an engraved rib that reduces the thickness, such as cutting or melting, may be formed.

[0284] After the first wall 412 is pre-formed, force may be applied to a portion of the first tray, so that the first and second regions of the first tray may be formed as distinct regions. For example, an engraved rib that reduces the thickness, such as pressing, may be formed.

[0285] The first region 412a of the first wall 412 may be provided spaced apart from a portion of the wall of the first tray where a circumference of the cell is maximum. The first region 412a of the first wall 412 may extend to the opening 413 in the second direction.

[0286] An additional configuration of the first tray 400 will be described. The first tray 400 may include a third extension wall 433 forming a flow path of fluid supplied to the cell 360. The third extension wall 433 may be understood as a guide device that supplies a material to the cell 360. The third extension wall 433 may extend in an outward direction, for example, upward, from the second part 412 (first wall).

[0287] The first tray 400 may include a peripheral wall 430 extending along a periphery of one end (for example, an upper end) of the first tray wall 410. For example, the peripheral wall 430 may be integrally formed with the first tray wall 410 and extend upward from one end (for example, an upper end) of the first tray wall 410.

[0288] As another example, the peripheral wall 430 may be formed separately from the first tray wall 410 and located around one end (for example, an upper end) of the first tray wall 410. In this case, the peripheral wall 430 may contact the first tray wall 410 or be spaced apart from the first tray wall 410. In either case, the peripheral wall 430 may surround at least a portion of the second tray 300.

[0289] If the first tray 400 includes the peripheral wall 430, the first tray 400 may surround the second tray 300. A space between the peripheral wall 430 and the second tray 300 may form a flow space for fluid when water is supplied from the water supply part 240.

[0290] The space between the peripheral wall 430 and the second tray 300 may form a storage space for the discharged fluid when fluid is discharged through the drainage part 324 of the second tray 300.

[0291] The peripheral wall 430 may include a second extension wall 431 extending in one direction (for example, an up-and-down direction) along a periphery of one end (for example, an upper end) of the second part 412. The second extension wall 431 may be disposed to surround at least a portion of the second tray 300. One end 431b of the second extension wall 431 may be formed at a position higher than the cell 360. For example, the one end 431b may form an "upper end."

[0292] A portion of an inner peripheral surface of the second extension wall 431 may contact the second tray 300. In detail, at least a portion of an outer peripheral surface of the second tray wall 310 may form a first contact surface 312a contacting the second extension wall 431.

[0293] The second extension wall 431 may extend inclinedly or roundly in a direction away from the second tray 300. The portion extending inclinedly or roundly may form a contact surface 431a contacting the first contact surface 312a.

[0294] The contact surface 431a may extend upwardly inclined by a predetermined angle with respect to the X-axis direction. That is, the contact surface 431a may form an inclined contact surface (refer to FIG. 16).

[0295] The second extension wall 431 may reduce heat, which is transferred from the transparent ice heater 490 to the first tray 400, from being transferred to a second cell 310b formed by the second tray 300. That is, the second extension wall 431 serves to keep a heat conduction path away from the second cell 310b.

[0296] The second extension wall 431 may be respectively provided at one end (for example, an upper end) of each of the plurality of first tray walls 410. The plurality of second extension walls 431 may be spaced apart from each other in one direction (for example, the X-axis direction).

[0297] The first tray 400 may include a partition wall 432 provided between the plurality of second extension walls 431. The partition wall 432 may connect one end (for example, a rear end) of each of the plurality of second extension walls 431. The plurality of second extension walls 431 may be spaced apart from each other by the partition wall 432.

[0298] The first tray 400 may include a plurality of tray parts defining a plurality of cells. For example, the plurality of tray parts may include a first tray part 401a defining a first cell, a second tray part 401b defining a second cell, and a third tray part 401c defining a third cell.

[0299] The first tray part 401a may be a part forming a center cell among the plurality of cells, and the second and third tray parts 401b and 401c may be parts forming both side cells among the plurality of cells. The first tray part 401a may be disposed between the second and third tray parts 401b and 401c.

[0300] The first to third tray parts 401a, 401b and 401c may be disposed to be connected to or in contact with each other (refer to FIGS. 13 and 14).

[0301] A plurality of partition walls 432 may be provided. For example, the partition wall 432 may include a first partition wall 432a provided between the second extension wall 431 of the first tray part 401a and the second extension wall 431 of the second tray part 401b.

[0302] The partition wall 432 may include a second partition wall 432b provided between the second extension wall 431 of the second tray part 401b and the second extension wall 431 of the third tray part 401c.

[0303] The second extension wall 431 and the third extension wall 433 may be disposed opposite to each other with respect to the center of the cell. For example, the second extension wall 431 may be disposed at one portion (for example, a rear portion) of the second tray 300, and the third extension wall 433 may be provided on an opposite side of the second extension wall 431.

[0304] At least a portion of the third extension wall 433 may guide a flow or form a flow path when water is supplied from the water supply part 240 to the cell 360.

[0305] The third extension wall 433 may extend in a first direction (for example, upward) from the first tray wall 410. The third extension wall 433 may be configured to have a "U" shape by extending in a second direction (for example, forward) from the second tray wall 410 and being bent in a third direction (for example, lateral).

[0306] The first tray 400 may include a plurality of cells. For example, the first tray 400 may include three cells. However, the number of cells may not be limited thereto. The first cell may be disposed between the second cell and the third cell so that fluid discharged from the first cell flows into the second cell and the third cell.

[0307] The extension wall 433 may be connected to a second cell wall forming the second cell and a third cell wall forming the third cell.

[0308] The second tray 300 may include a water supply guide 327 provided at least at one side of the guide surface 311. The water supply guide 327 protrudes from the second tray wall 310 of the second tray 300 and may prevent fluid from leaking to the outside of the guide surface 311. For example, the water supply guide 327 may include a protruding rib.

[0309] The water supply guide 327 may protrude from at least one side of the guide surface 311. The guide surface 311 may be understood as a surface defined between the water supply guides 327 on both sides of an outer surface of the second tray wall 310.

[0310] The water supply guide 327 may extend from the guide wall 320 toward the third extension wall 433. A space in which fluid is stored or a space in which fluid flows may be formed between the third extension wall 433 and the water supply guide 327.

[0311] The first tray 400 may include a connection wall 434 connecting the second extension wall 431 and the third extension wall 433. The connection wall 434 may extend roundly or inclinedly in one direction (for example, backward) from the second extension wall 431 toward the third extension wall 433.

[0312] The connection wall 434 may be provided at least at one side of the first tray 400. In a broad sense, the connection wall 434 may be understood as being a portion of the second extension wall 431. In this case, it may be understood that the second extension wall 431 is connected to the third extension wall 433.

[0313] One end of the third extension wall 433 may be connected to the second tray part 401b, and the other end may be connected to the third tray part 401c. For example, both ends of the third extension wall 433 may be connected to the second extension wall 431 of the second tray part 401b and the second extension wall 431 of the third tray part 401c.

[0314] The second extension wall 431, the partition wall 432, the connection wall 434, and the third extension wall 433 may define a space where the second tray 300 is located. The space may form a space (flow path) where fluid flows or a space where fluid is stored during a water supply process.

[0315] The first tray 400 may include a reinforcing rib 412b2 for reinforcing strength of the first tray 400. The reinforcing rib 412b2 may be a portion constituting the second region 412b. The reinforcing rib 412b2 may be provided on the first tray wall 410 or the peripheral wall 430.

[0316] The first tray 400 may be made of a flexible material. The reinforcing rib 412b2 may prevent unwanted deformation from occurring when water is supplied to the first tray 400 or during a process of moving to an ice-releasing position (or an ice-making position).

[0317] For example, the reinforcing rib 412b2 may be provided on at least one wall among the second part 412, the second extension wall 431, and the partition wall 432. The reinforcing rib 412b2 may be disposed on a surface of the at least one wall so as to extend in one direction (for example, an up-and-down direction).

[0318] The reinforcing rib 412b2 is provided at a position where strength is relatively weak in the first tray 400 to prevent unwanted expansion or deformation from occurring during an ice-making process. For example, at least a portion of the reinforcing rib 412b2 may be disposed in the second region 412b having a second thickness t2 among the first tray wall 410, particularly the second part 412 (refer to FIG. 14).

[0319] FIG. 10 is a cross-sectional view taken along line 10-10 of FIG. 6, FIG. 11 is a cross-sectional view taken along line 11-11 of FIG. 6, FIG. 12 is a cross-sectional view taken along line 12-12 of FIG. 6, FIG. 13 is a front view of the first tray, FIG. 14 is a cross-sectional view taken along line 14-14 of FIG. 13, FIG. 15 is a cross-sectional view taken along line 15-15 of FIG. 13, and FIG. 16 is a cross-sectional view of the tray assembly.

[0320] Referring to FIGS. 10 to 16, the first tray 400 according to the embodiment of the present invention may include a first wall 412 and a second wall 411. The first wall 412 may include a portion having a less degree of internal deformation resistance than the second wall 411. The first wall 412 may include a first region 412a having a first thickness t1 and a second region 412b having a second thickness t2 greater than the first thickness t1.

[0321] The second region 412b may include a rib protruding from the first region 412a. The rib may include a first rib 412b1 extending in a circumferential direction. The rib may include a second rib 412b2 extending from the first rib 412b1 toward the opening 413.

[0322] FIG. 13 is a cross-sectional view based on a cutting line passing through the third extension wall 433 without passing through the second rib 412b2, FIG. 14 is a cross-sectional view based on a cutting line passing through the second rib 412b2 and the third extension wall 433, and FIG. 15 is a cross-sectional view based on a cutting line passing through neither the second rib 412b2 nor the third extension wall 433.

[0323] Referring first to FIG. 13, the second wall 411 may form the second thickness t2. The first region 412a of the first wall 412 may form the first thickness t1. The second extension wall 431 may form the first thickness t1.

[0324] A thickness of the third extension wall 433 may form a third thickness t3. The second thickness t2 and the third thickness t3 may be greater than the first thickness t1. The third thickness t3 may be equal to the second thickness t2 or slightly smaller than the second thickness t2.

[0325] Since the first part 411 is supported by the first tray supporter 450, a desired ice shape may be implemented during a process in which fluid expands during ice-making. However, the second part 412 (first wall) protrudes upward from the first tray supporter 450 and may not be directly supported by the first tray supporter 450. Accordingly, it may not be easy to implement a desired ice shape during a process in which fluid expands during ice-making.

[0326] To solve this, at least one of the first region 412a or the second region 412b may be configured such that a portion adjacent to the first extension wall 420 in the second part 412 undergoes relatively little deformation, and a portion far from the first extension wall 420 undergoes relatively much deformation.

[0327] The second region 412b forms a portion adjacent to the first extension wall 420 and may have a relatively large second thickness t2. The portion adjacent to the first extension wall 420 may be understood as a portion adjacent to a center C1 of the cell 360 forming a diameter D1 of ice.

[0328] The second region 412b may be understood as a portion adjacent to an extension line passing through the center C1 of the cell 360 in a first direction (for example, a horizontal direction). Among the second region 412b, the first rib 412b1 may be located adjacent to an extension line passing through the center C1 of the cell 360 in the first direction (for example, a horizontal direction).

[0329] The first region 412a forms a portion relatively far from the first extension wall 420 and may have a relatively small first thickness t1. The portion relatively far from the first extension wall 420 may be understood as a portion far from the center C1 of the cell 360 forming the diameter D1 of ice.

[0330] The first region 412a may be understood as a portion adjacent to the first opening 413 of the first tray 400. In this way, by increasing the degree of internal deformation resistance or thickness of a portion of the second region 412b close to the center of ice in the cell 360, a deformation amount may be small during an ice-releasing process of ice.

[0331] By decreasing the degree of internal deformation resistance or thickness of another portion of the first region 412a far from the center of ice in the cell 360, a deformation amount may be large during the ice-releasing process of ice. According to such a configuration, when ice is discharged while the first opening 413 of the first tray 400 expands during the ice-releasing process of ice, a deformation amount at a portion adjacent to the first opening 413 increases, so that ice-releasing may be easily performed.

[0332] The first wall 412 may be configured such that a size of the first region 412a having the first thickness t1 increases from the first extension wall 420 toward the first opening 413. For example, a first portion and a second portion of the second region 412b having the second thickness t2 are disposed apart from each other, and the first region 412a may be provided between the first and second portions. For example, the first and second portions may be spaced apart in the circumferential direction.

[0333] An area of the first region 412a may become larger toward the first opening 413. According to such a configuration, an expansion rate may be evenly maintained in the circumferential direction of the first wall 412 during an ice-making process.

[0334] Referring to FIG. 11, to reinforce the thin thickness of the first region 412a and the second extension wall 431, the first tray 400 may include the second rib 412b2 (reinforcing rib). A portion of the first wall 412 where the second rib 412b2 is provided may have the second thickness t2.

[0335] The second rib 412b2 may form a portion of the second region 412b. The second rib 412b2 may be provided on an outer surface of at least one of the first region 412a or the second extension wall 431.

[0336] A plurality of second ribs 412b2 are arranged apart from each other in the circumferential direction of the first wall 412, so that an expansion rate may be evenly maintained in the circumferential direction of the first wall 412.

[0337] The thickness t3 of the third extension wall 433 may be formed larger than a thickness t1 of at least one of the first region 412a of the first wall 412 or the second extension wall 431 so as not to be easily deformed by pressure of fluid.

[0338] Referring to FIG. 16, the third extension wall 433 may be formed stepped. For example, the third extension wall 433 may include a first part 433a extending in one direction (for example, upward) from the opening 413 of the first tray wall 410 forming the opening 413.

[0339] The first part 433a may constitute at least a portion of the first region 412a or the second region 412b of the first wall 412. The first part 433a may form a contact surface contacting the second tray 300. The second tray 300 may form a second contact surface 312b contacting the first part 433a. The second contact surface 312b may form a contact surface extending in one direction (for example, an up-and-down direction).

[0340] The third extension wall 433 may include a second part 433b extending inclinedly in one direction (for example, upward) from the first part 433a. The second part 433b may extend inclinedly in a direction away from the second tray 300.

[0341] The third extension wall 433 may include a third part 433c extending in one direction (for example, upward) from the second part 433b. A space defining a flow path of fluid may be formed inside the third extension wall 433.

[0342] The water supply part 240 may include a portion located inside the third extension wall 433. Fluid from the water supply part 240 may be discharged from an internal space of the third extension wall 433 and fall into the second tray 300.

[0343] Returning to FIG. 12, the connection wall 434 may form a relatively thin first thickness t1. A thickness of the connection wall 434 may be substantially equal to the thickness of the first region 412a of the first wall 412. By forming such a thickness, the first wall 412 may have a condition in which a deformation amount is relatively large during an ice-releasing process.

[0344] Another embodiment may be proposed. The first region 412a and the second region 412b of the first wall 412 may be made of different materials so as to have different degrees of internal deformation resistance. For example, a material of the second region 412b and a material of the first region 412a may be different so that the internal deformation resistance of the second region 412b is greater than the internal deformation resistance of the first region 412a.

[0345] FIGS. 17 and 18 are views showing the operation of the ice maker according to the first embodiment of the present invention.

[0346] FIG. 17 shows ice being made in the ice maker. When ice-making is completed at the ice-making position of the first and second tray assemblies, ice I is generated, and the second tray assembly may be moved to the ice-releasing position as shown in FIG. 18.

[0347] The direction in which the first tray assembly moves from the ice-making position of FIG. 17 to the ice-releasing position of FIG. 18 may be referred to as forward movement (or forward rotation). Conversely, the direction of moving from the ice-releasing position of FIG. 18 to the ice-making position of FIG. 17 may be referred to as reverse movement (or reverse rotation).

[0348] When the driver 510 is driven forward by a predetermined angle, the contact between the ice and the second tray 300 is separated, and the ice I may move while being located in the first tray 400. Since the adhesion (or contact area) between the ice and the first tray 400 is formed greater than the adhesion (or contact area) between the ice and the second tray 300, the ice and the second tray 300 may be easily separated during the ice-releasing process.

[0349] As the pusher 540 presses one end (for example, a lower end) of the first tray 400, the ice may be separated from the first tray 400. In the process where the ice is separated from the first tray 400, the first tray 400 may be deformed in a direction in which the diameter of the opening 413 expands. To this end, the first tray 400 may be made of, for example, a flexible or ductile material. The separated ice may be completely detached from the first tray 400 and stored in the ice bin 600.

[0350] When the ice-releasing operation is completed, the first tray assembly moves in the reverse direction to return to the ice-making position as shown in FIG. 17. When a water supply operation starts at the position of FIG. 17, the first tray assembly moves forward toward a water supply position. At the water supply position, material M is supplied through the water supply part 240, and fluid may be supplied to the plurality of cells 360. Once water supply is complete, the system waits for a predetermined time to allow water to spread and be supplied from one cell (center cell) to other cells (both side cells).

[0351] After the set time elapses, the first tray assembly moves in the reverse direction to the ice-making position as shown in FIG. 17 and performs the ice-making operation. During the ice-making process, cold air is supplied to the ice maker, and the transparent ice heater 490 operates to manufacture transparent ice.

[0352] FIG. 19 is a graph showing a change in withdrawal force measured according to a withdrawal distance during an ice-releasing process of ice, FIG. 20 is a view showing a configuration of a pusher according to the first embodiment of the present invention, and FIG. 21 is a schematic view showing how a difference in time of maximum ice-releasing force occurs according to a length difference of the pusher during the ice-releasing process.

[0353] Referring to FIG. 19, the withdrawal force generated by the motor 510 may change while ice-releasing proceeds after ice-making is completed in the cell 360. A distance from a center height of the cell 360 to the first opening 413 of the first tray 400 may be defined as a first distance △S, and a distance that the ice is withdrawn in the ice-releasing direction may be defined as a withdrawal distance h.

[0354] [A] shows a state where the withdrawal distance h is ho at the time ice-making is completed, and [B] to [D] show states where the withdrawal distances are h1 to h3. The ho may be 0. Looking at the change in withdrawal force from [A] to [D] as the withdrawal distance increases, the withdrawal force increases due to interference between the ice and the first tray 400 as the withdrawal distance increases from ho (0) toward [B].

[0355] When the withdrawal distance is ho, the withdrawal force may form F1. The F1 may be 0. During the ice withdrawal process, the opening 413 of the first tray 400 expands, and in this process, the withdrawal force (ice-releasing torque) of the motor 510 may increase.

[0356] The withdrawal force may increase until it reaches the state of [B], that is, the withdrawal distance corresponds to h1. For example, the withdrawal distance h1 may correspond to 1 / 2 of the first distance △S. When the withdrawal distance is h1, the withdrawal force may form F2. When the withdrawal distance of the ice starts to increase further from h1, the restoring force of the first tray 400 assists in withdrawing the ice, and in this process, the withdrawal force of the motor 510 may decrease.

[0357] The withdrawal force forms F3 in the state of [C], that is, when the withdrawal distance is h2, where F3may be less than F2. For example, the withdrawal distance h2 may be equal or substantially equal to the first distance △S. As the withdrawal of ice continues in the state of [C], the withdrawal force of the motor 510 decreases and reaches a minimum withdrawal force at a withdrawal distance h2'.

[0358] The withdrawal distance h2' corresponds to a distance between [C] and [D], and at this withdrawal distance h2', the withdrawal force (ice-releasing torque) of the motor 510 forms a force in the opposite direction. As the withdrawal distance increases further from h2', the withdrawal force of the motor increases, and in the [D] state where ice-releasing is completely achieved, the withdrawal force of the motor converges to 0. Thus, based on the change in withdrawal force of the motor 510 during the ice-releasing process, the pusher 540 according to the first embodiment may be configured to differentiate the timing of maximum input of the motor.

[0359] The pusher 540 may include a plurality of pushing bars 544 corresponding to the plurality of cells 360. The plurality of pushing bars 544 may have different lengths. The plurality of pushing bars 544 may include a first pushing bar 544a having a first length E1, a second pushing bar 544b having a second length E2, and a third pushing bar 544c having a third length E3.

[0360] The third length E3 may be greater than the second length E2 by a second length difference △L2.

[0361] The second length E2 may be greater than the first length E1 by a first length difference △L1.

[0362] According to the length difference of the pushing bars 544, after a point in time when the withdrawal force generated in the cell 360 released by the third pushing bar 544c is maximum has passed, the point in time of maximum withdrawal force in the cell 360 released by the second pushing bar 544b may arrive.

[0363] After the point in time of maximum withdrawal force in the cell 360 released by the second pushing bar 544b has passed, the point in time of maximum withdrawal force in the cell 360 released by the first pushing bar 544a may arrive. According to this configuration, when ice is released from the plurality of cells 360, the timing of maximum ice-releasing torque in each cell is differentiated, and accordingly, the load on the motor 510 can be distributed. As a result, the ice-releasing timing in the plurality of cells 360 may vary.

[0364] FIG. 22 is an experimental graph showing a change in maximum ice-releasing force according to a ratio of ice diameter to the opening diameter of the first tray. Referring to FIG. 22, the horizontal axis represents the ratio of the diameter of the first opening 413 of the first tray 400 to the diameter of the ice. The vertical axis represents the maximum ice-releasing force generated by the motor 510. The maximum ice-releasing force may be understood as the ice-releasing force generated by the motor 510 when the ice is separated from the first tray 400.

[0365] The starting point of the horizontal axis represents 50%, and the end point represents 100%. The starting point indicates that the diameter of the first opening 413 is 1 / 2 of the ice diameter, and the end point indicates that the diameter of the first opening 413 is equal to the ice diameter. At the end point, the maximum ice-releasing force of the motor 510 may be substantially close to 0.

[0366] In the embodiment of the present invention, for ice-releasing to be normally performed from the first tray 400, it is preferable that the maximum ice-releasing force is formed below a reference ice-releasing force Fo. If the maximum ice-releasing force is above the reference ice-releasing force Fo, it may be understood that there is a high possibility that ice-releasing is not achieved and the first tray 400 only undergoes deformation while still holding the ice, despite sufficient ice-releasing force being generated.

[0367] As a result of the experiment, desired ice-releasing performance may be realized when the ratio is formed in a section corresponding to the reference ice-releasing force Fo or less, i.e., 70% or more and less than 100%. Therefore, in this embodiment, a ratio of the diameter of the first opening 413 of the first tray 400 to the diameter of the ice is proposed to be 70% or more and less than 100%.

[0368] FIG. 23 is an experimental graph showing a change in insertion depth of a pushing bar at which maximum ice-releasing force occurs, according to the hardness of the first tray. Referring to FIG. 23, the horizontal axis represents the hardness $H$ of the first tray 400, and the vertical axis represents the insertion depth at which maximum ice-releasing force occurs.

[0369] The insertion depth on the vertical axis may represent the insertion depth of the pushing bar 544 at the point of ice-releasing from the first tray 400. That is, the insertion depth may be understood as the distance the pushing bar 544 moves from the point the pushing bar 544 contacts the first tray 400 to the point ice-releasing occurs. If the insertion depth is too large, it may be understood that the ice is not released and the first tray 400 only undergoes deformation while holding the ice, even though the pushing bar 544 has been sufficiently inserted toward the first tray 400.

[0370] As a result of the experiment, if the hardness of the first tray 400 is too low, i.e., H1 or less, ductility increases and ice-releasing may not be performed well. Conversely, if the hardness of the first tray 400 is too high, i.e., H2 or more, deformation of the first tray 400 is not easily achieved, so insertion of the pushing bar 544 may be difficult. Therefore, in this embodiment, to obtain desired ice-releasing performance, the hardness H is determined within a range where the insertion depth is greater than a first depth Dp1 and less than a second depth Dp2.

[0371] The silicone hardness H may be greater than a first hardness H1 so that the insertion depth is less than the second depth Dp2. The silicone hardness H may be less than a second hardness H2 so that the insertion depth is greater than the first depth Dp1.

[0372] For example, the first depth Dp1 may be a value corresponding to 14% of the ice diameter. The second depth Dp2 may be a value corresponding to 35% of the ice diameter.

[0373] In summary, the hardness of the first tray 400 may be determined to be a value greater than the first hardness H1 and less than the second hardness H2 such that the insertion depth is formed in a range of 14% to 35% relative to the ice diameter. The first tray 400 may be made of a deformable material, for example, silicone.

[0374] Hereinafter, additional embodiments of the present invention will be described. Since these additional embodiments differ in the configuration of the first tray compared to the first embodiment, the differences will be focused upon, and for the same parts as the first embodiment, the descriptions and reference numerals of the first embodiment are cited.

[0375] FIG. 24 is a perspective view of a first tray according to a second embodiment of the present invention, FIG. 25 is a side view of the first tray, FIG. 26 is a cross-sectional view taken along line 26-26 of FIG. 24, FIG. 27 is a cross-sectional view taken along line 27-27 of FIG. 24, FIG. 28 is a front view of the first tray, and FIG. 29 is a cross-sectional view taken along line 29-29 of FIG. 28.

[0376] Referring to FIGS. 24 to 29, a first tray 400a according to the second embodiment of the present invention may include a first tray wall 1410 forming a portion of a cell 360. The first tray wall 1410 may include a first part 1411 located at one side (for example, a lower side) of a first extension wall 420 with respect to the first extension wall 420. The first part 1411 may form a portion of a region (for example, a lower region) of the cell 360.

[0377] The first tray wall 1410 may include a second part 1412 located at the other side (for example, an upper side) of the first extension wall 420 with respect to the first extension wall 420. The second part 1412 may form a portion of another region (for example, an upper region) of the cell 360.

[0378] One end (for example, an upper end) of the second part 1412 may form a first opening 413. The first opening 413 forms a contact end 412c where the second tray 300 contacts, and a second extension wall 431 of the first tray 400a may extend inclinedly in one direction (for example, upward) from the contact end 412c.

[0379] As described in the first embodiment, the first part 1411 may be named a "second wall," and the second part 1412 may be named a "first wall." The first wall 1412 may include a plurality of regions having different degrees of internal deformation resistance. The first wall 1412 may include a first region 1412a having a first degree of internal deformation resistance and a second region 1412b having a second degree of internal deformation resistance greater than the first degree of internal deformation resistance.

[0380] The second region 1412b may protrude from the first region 1412a. The second region 1412b may be formed in a circumferential direction of the first region 1412a.

[0381] The second region 1412b may include a first rib 1412b1 extending in a direction from the first extension wall 420 toward the first opening 413, that is, a direction corresponding to an ice-releasing direction. A plurality of first ribs 1412b1 may be provided spaced apart in one direction of the first region 1412a. For example, the one direction may be a circumferential direction.

[0382] The second region 1412b may include a second rib 1412b2 connecting two adjacent first ribs 1412b1 and extending in the one direction.

[0383] The first tray 400a may include a third extension wall 1433 extending from the first tray wall 1410 and forming a flow path for supplied fluid. The third extension wall 1433 may include a first wall part 1434 extending in a direction in which the plurality of cells are arranged, that is, a direction in which a plurality of tray parts 401a, 401b, 401c forming the plurality of cells are arranged.

[0384] The third extension wall 1433 may include a second wall part 1435 extending from at least one end of the first wall part 1434 to the second extension wall 431 and connected to the second extension wall 431. An internal space defined by the first wall part 1434 and the second wall part 1435 may form a flow path for fluid. The third extension wall 1433 of the first tray 400b may contact the second tray 300.

[0385] FIG. 26 is a cross-sectional view based on a cutting line passing through the third extension wall 1433 without passing through the first rib 1412b1, and FIG. 27 is a cross-sectional view based on a cutting line passing through the first rib 1412b1 and the third extension wall 433.

[0386] Referring to FIG. 26, the second wall 411 may form a second thickness t2. The first region 1412a of the first wall 1412 may form a first thickness t1. The second extension wall 431 may form the first thickness t1. A thickness of the third extension wall 433 may form a third thickness t3.

[0387] The second thickness t2 may be greater than the first thickness t1. The third thickness t3 may be equal to the second thickness t2 or slightly less than the second thickness t2.

[0388] Referring to FIG. 27, to reinforce the thin thickness of the first region 1412a, the first tray 400 may include a first rib 1412b1 (reinforcing rib). A portion of the first wall 1412 where the first rib 1412b1 is provided may have the second thickness t2. A portion of the first wall 1412 where the second rib 1412b2 is provided may have the second thickness t2.

[0389] The first rib 1412b1 may form a portion of the second region 412b. The first rib 1412b1 may be provided on an outer surface of at least one of the first region 1412a or the second extension wall 431. A plurality of first ribs 1412b1 are arranged apart in one direction of the first wall 1412, so that an expansion rate may be evenly maintained in the one direction of the first wall 1412. For example, the one direction may be a circumferential direction.

[0390] A thickness t2 of the third extension wall 1433 may be formed greater than a thickness t1 of the first region 1412a of the first wall 1412 so as not to be easily deformed by pressure of fluid.

[0391] Another embodiment may be proposed. The first region 1412a and the second region 1412b of the first wall 1412 may be made of different materials so as to have different degrees of internal deformation resistance. For example, the material of the second region 1412b and the material of the first region 1412a may be different so that the internal deformation resistance of the second region 1412b is greater than the internal deformation resistance of the first region 1412a.

[0392] FIG. 30 is a perspective view of a first tray according to a third embodiment of the present invention, FIG. 31 is a side view of the first tray, FIG. 32 is a top view of the first tray, FIG. 33 is a bottom view of the first tray, FIG. 34 is a cross-sectional view taken along line 34-34 of FIG. 30, FIG. 35 is a cross-sectional view taken along line 35-35 of FIG. 30, FIG. 36 is a front view of the first tray, FIG. 37 is a cross-sectional view taken along line 37-37 of FIG. 36, and FIG. 38 is a cross-sectional view taken along line 38-38 of FIG. 36.

[0393] Referring to FIGS. 30 to 38, a first tray 400b according to the third embodiment of the present invention may include a first tray wall 2410 forming a portion of a cell 360. The first tray wall 2410 may include a first part 2411 located at one side (for example, a lower side) of a first extension wall 420 with respect to the first extension wall 420. The first part 2411 may form a portion of a region (for example, a lower region) of the cell 360.

[0394] The first tray wall 2410 may include a second part 2412 located at the other side (for example, an upper side) of the first extension wall 420 with respect to the first extension wall 420. The second part 2412 may form a portion of another region (for example, an upper region) of the cell 360.

[0395] One end (for example, an upper end) of the second part 2412 may form a first opening 413. The first opening 413 forms a contact end 412c where the second tray 300 contacts, and a second extension wall 431 of the first tray 400b may extend inclinedly in one direction (for example, upward) from the contact end 412c.

[0396] The first wall 2412 may include a plurality of regions having different degrees of internal deformation resistance. The first wall 2412 may include a first region 2412a having a first degree of internal deformation resistance and a second region 2412b having a second degree of internal deformation resistance greater than the first degree of internal deformation resistance.

[0397] The second region 2412b may protrude from the first region 2412a. The second region 2412b may be formed in a circumferential direction of the first region 2412a.

[0398] The second region 2412b may include a rib 2412b extending in a direction from the first extension wall 420 toward the first opening 413, that is, a direction corresponding to an ice-releasing direction. A plurality of ribs 2412b may be provided spaced apart in the circumferential direction of the first region 2412a.

[0399] Referring to FIG. 33, a second edge 422b' may have a shape bent to connect a second tray part 401b and a third tray part 401c. One end of the second edge 422b' may be connected to the second tray part 401b.

[0400] The other end of the second edge 422b' may be connected to the third tray part 401c. The second edge 422b' may include a portion bent in a "⊏" shape to connect the one end and the other end.

[0401] FIG. 34 is a cross-sectional view based on a cutting line passing through a third extension wall 1433 without passing through the rib 2412b, and FIG. 35 is a cross-sectional view based on a cutting line passing through the rib 2412b and the third extension wall 1433.

[0402] Referring to FIG. 34, a second wall 2411 may form a second thickness t2. A first region 2412a of a first wall 2412 may form a first thickness t1. A second extension wall 431 may form the first thickness t1. A thickness of a third extension wall 433 may form a third thickness t3.

[0403] The second thickness t2 may be greater than the third thickness t3, and the third thickness t3 may be greater than the first thickness t1. To reinforce the thin thickness of the first region 2412a, the first tray 400 may include a rib 2412b (reinforcing rib).

[0404] A portion of the first wall 2412 where the rib 2412b is provided may have the second thickness t2. The rib 2412b may form a portion of the second region 2412b. The rib 2412b may be provided on an outer surface of at least one of the first region 2412a or the second extension wall 431.

[0405] A plurality of first ribs 2412b are arranged apart in one direction of the first wall 2412, so that an expansion rate may be evenly maintained in the one direction of the first wall 2412. For example, the one direction may be a circumferential direction.

[0406] A thickness t2 of the third extension wall 1433 may be formed greater than a thickness t1 of the first region 2412a of the first wall 2412 so as not to be easily deformed by pressure of fluid.

[0407] Another embodiment may be proposed. The first region 2412a and the second region 2412b of the first wall 2412 may be made of different materials so as to have different degrees of internal deformation resistance. For example, the material of the second region 2412b and the material of the first region 2412a may be different so that the internal deformation resistance of the second region 2412b is greater than the internal deformation resistance of the first region 2412a.

[0408] Referring to FIGS. 37 and 38, the first wall 2412 may include a reinforcing rib 2412d. The reinforcing rib 2412d may be provided on at least one of a portion connected to the second extension wall 431 or a portion connected to the third extension wall 1433 among an outer peripheral surface of the first wall 2412.

[0409] Since the second extension wall 431 extends long upward from a point of contact with the second tray 300, it has a possibility of being deformed by its own weight. Meanwhile, if the first tray 400 is folded when moving in the reverse direction from an ice-releasing position to an ice-making position, an interference problem with the second tray 300 may occur. Therefore, by providing the reinforcing rib 2412d at a point where the second extension wall 431 is connected among the first wall 2412, the internal deformation resistance of the second extension wall 431 may be increased.

[0410] The third extension wall 1433 may form a flow path for supplying fluid to the cell during a water supply process. The third extension wall 433 has a possibility of being deformed by water pressure of fluid. Therefore, by providing the reinforcing rib 2412d at a point where the third extension wall 1433 is connected among the first wall 2412, the internal deformation resistance of the third extension wall 1433 may be increased.

[0411] The reinforcing rib 2412d may protrude from the first region 1412a and be configured to have a predetermined width in the circumferential direction. The reinforcing rib 2412d may be configured to extend in an ice-releasing direction from the first extension wall 420 to the first opening 413.

[0412] The rib 2412b may be provided on an outer surface of the reinforcing rib 2412d. The reinforcing rib 2412d may also be provided on an outer peripheral surface of the first wall 2412 where the rib 2412b is not provided. The rib 2412b may be named a "first rib," and the reinforcing rib 2412d may be named a "second rib."

[0413] FIG. 39 is a perspective view of a first tray according to a fourth embodiment of the present invention, FIG. 40 is a side view of the first tray, FIG. 41 is a cross-sectional view taken along line 41-41 of FIG. 39, FIG. 42 is a cross-sectional view taken along line 42-42 of FIG. 39, FIG. 43 is a front view of the first tray, FIG. 44 is a cross-sectional view taken along line 44-44 of FIG. 43, and FIG. 45 is a cross-sectional view taken along line 45-45 of FIG. 43.

[0414] Referring to FIGS. 39 to 45, a first tray 400c according to the fourth embodiment of the present invention may include a first wall 3412 and a second wall 3411. The first wall 3412 may include a portion having a less degree of internal deformation resistance than the second wall 3411.

[0415] The first wall 3412 may include a first region 3412a having a first thickness t1 and a second region 3412b having a second thickness t2 greater than the first thickness t1.

[0416] The second region 3412b may include ribs protruding from the first region 3412a. The ribs may include a first rib 3412b1 extending in a circumferential direction. The ribs may include a second rib 3412b2 extending from the first rib 3412b1 toward the opening 413.

[0417] The first rib 3412b1 may have a shape in which polygonal shapes, for example, triangular shapes, are repeatedly arranged in the circumferential direction. The second rib 3412b2 may extend from a peak of the first rib 3412b1 toward the first opening 413. For example, the second rib 3412b2 may have a strip or bar shape.

[0418] FIG. 41 is a cross-sectional view based on a cutting line passing through the third extension wall 1433 without passing through the second rib 3412b2, and FIG. 42 is a cross-sectional view based on a cutting line passing through the second rib 3412b2 and the third extension wall 1433.

[0419] The second wall 3411 may form the second thickness t2. The first region 3412a of the first wall 3412 may form the first thickness t1. The second extension wall 431 may form the first thickness t1. A thickness of the third extension wall 1433 may form a third thickness t3.

[0420] The second thickness t2 may be greater than the third thickness t3. The third thickness t3 may be greater than the first thickness t1. The first wall 3412 may be configured such that a size of the first region 3412a having the first thickness t1 increases from the first extension wall 420 toward the first opening 413.

[0421] For example, a first portion and a second portion of the second region 3412b having the second thickness t2 are arranged apart from each other, and the first region 3412a may be provided between the first and second portions. For example, the first and second portions may be spaced apart in the circumferential direction.

[0422] An area of the first region 3412a may become larger toward the first opening 413. According to such a configuration, an expansion rate may be evenly maintained in the circumferential direction of the first wall 3412 during an ice-making process.

[0423] Referring to FIG. 42, to reinforce the thin thickness of the first region 3412a, the first tray 400c may include a second rib 3412b2 (reinforcing rib).

[0424] A portion of the first wall 3412 where the second rib 3412b2 is provided may have the second thickness t2. The second rib 3412b2 may form a portion of the second region 3412b. The second rib 3412b2 may be provided on an outer surface of the first region 3412a.

[0425] A plurality of second ribs 3412b2 are arranged apart in the circumferential direction of the first wall 3412, so that an expansion rate can be evenly maintained in the circumferential direction of the first wall 3412. A thickness t3 of the third extension wall 1433 may be formed greater than a thickness t1 of the first region 3412a of the first wall 3412 and the second extension wall 431 so as not to be easily deformed by pressure of fluid.

[0426] Another embodiment may be proposed. The first region 3412a and the second region 3412b of the first wall 3412 may be made of different materials so as to have different degrees of internal deformation resistance. The material of the second region 3412b and the material of the first region 3412a may be different so that the internal deformation resistance of the second region 3412b is greater than the internal deformation resistance of the first region 3412a.

[0427] FIG. 46 is a perspective view of a first tray according to a fifth embodiment of the present invention, FIG. 47 is a side view of the first tray, FIG. 48 is a cross-sectional view taken along line 48-48 of FIG. 46, FIG. 49 is a cross-sectional view taken along line 49-49 of FIG. 46, FIG. 50 is a front view of the first tray, FIG. 51 is a cross-sectional view taken along line 51-51 of FIG. 50, and FIG. 52 is a cross-sectional view taken along line 52-52 of FIG. 50.

[0428] Referring to FIGS. 46 to 52, a first tray 400d according to the fifth embodiment of the present invention may include a first wall 4412 and a second wall 4411. The first wall 4412 may include a portion having a less degree of internal deformation resistance than the second wall 4411.

[0429] The first wall 4412 may include a first region 4412a having a first thickness t1 and a second region 4412b having a second thickness t2 greater than the first thickness t1.

[0430] The second region 4412b may include a rib 4412b protruding from the first region 4412a. The rib 4412b may extend in a circumferential direction of the first region 4412a. For example, the rib 4412b may have a ring shape.

[0431] The second region 4412b is connected to the first extension wall 420 and may be configured to have a predetermined height. The first region 4412a may extend from the second region 4412b in a direction toward the first opening 413.

[0432] The second wall 4411 may form the second thickness t2. The first region 4412a of the first wall 4412 may form the first thickness t1. The second extension wall 431 may form the first thickness t1. A thickness of the third extension wall 1433 may form a third thickness t3.

[0433] The second thickness t2 is greater than the third thickness t3, and the third thickness t3 may be greater than the first thickness t1. Since the second region 4412b includes the rib 4412b extending in the circumferential direction, an expansion rate may be evenly maintained in the circumferential direction of the first wall 4412 during the ice-making process.

[0434] Diameters of a plurality of cells 360 according to the fifth embodiment of the present invention may be formed differently from each other. For example, the plurality of cells 360 may include a first cell 360a at the center, and a second cell 360b and a third cell 360c on both sides.

[0435] At least two of a diameter D11 of the first cell 360a, a diameter D12 of the second cell 360b, and a diameter D13 of the third cell 360c may be formed in different sizes. For example, D11 may be greater than D12, and D13 may be greater than D11. For instance, D11 may be 49 mm, D12 may be 48 mm, and D13 may be 50 mm.

[0436] At least two of a diameter D21 of an opening 413a of a center-side tray part defining a portion of the first cell 360a, a diameter D22 of an opening 413b of a first side-side tray part defining a portion of the second cell 360b, and a diameter D23 of an opening 413c of a second side-side tray part defining a portion of the third cell 360c may be formed in different sizes. For example, D21 may be greater than D22, and D23 may be greater than D21. For instance, D21 may be 47 mm, D22 may be 45 mm, and D23 may be 49 mm.

[0437] The D21, D22, and D23 may correspond to the diameters of the openings of the first tray 400d. To implement this configuration, a height △S1 of the opening 413b relative to a center of a height in one direction (for example, vertical direction) of the second cell 360b may be greater than a height △S2 of the opening 413c relative to a center of a vertical height of the third cell 360c.

[0438] Based on a contact area between the second tray 300 and ice, a contact area on the side of the third cell 360c may be greater than a contact area of the first cell 360a at the center. The contact area of the first cell 360a at the center may be greater than a contact area on the side of the second cell 360b. According to such a configuration, when ice-releasing ice made in the plurality of cells 360 by driving the driver 510, a deformation amount of the first tray 400d that is, a deformation amount according to a difference between the diameter of the ice and the diameter of the opening of the first tray 400d may vary over time, which has an advantage of reducing ice-releasing torque.

[0439] Another embodiment may be proposed. The first region 4412a and the second region 4412b of the first wall 4412 may be made of different materials so as to have different degrees of internal deformation resistance. The material of the second region 4412b and the material of the first region 4412a may be different so that the internal deformation resistance of the second region 4412b is greater than the internal deformation resistance of the first region 4412a.Industrial Applicability

[0440] The present invention relates to an ice maker and / or a refrigerator equipped with an ice maker. Since it includes a tray forming an opening smaller than a diameter of ice and may easily discharge ice using deformation of the tray, it has significant industrial applicability.

Claims

1. A refrigerator, comprising: a storage space in which food is stored; a door for opening and closing the storage space; an ice-making space provided in the door or the storage space; a cooler for supplying cold to the storage space; a cell provided in the ice-making space, the cell being a space where a substance undergoes a phase change from a liquid phase to a solid phase; and a tray wall provided with a first wall forming at least a portion of the cell and a second wall forming another portion of the cell, wherein the first wall includes a portion having a less degree of internal deformation resistance than a degree of internal deformation resistance of the second wall.

2. The refrigerator of claim 1, wherein the first wall includes a portion where a degree of internal deformation resistance in a radial direction of the cell or a degree of internal deformation resistance in an ice-releasing direction is less than that of the second wall.

3. The refrigerator of claim 1, wherein the first wall includes a portion where a degree of internal deformation resistance in a radial direction of the cell is less than a degree of internal deformation resistance in an ice-releasing direction.

4. The refrigerator of claim 1, wherein the first wall is configured such that a degree of internal deformation resistance in a radial direction of the cell varies along an ice-releasing direction of the cell, or a degree of internal deformation resistance in the ice-releasing direction of the cell varies along the radial direction of the cell.

5. The refrigerator of claim 1, wherein a first change rate, at which a degree of internal deformation resistance in a radial direction of the cell varies along an ice-releasing direction of the cell, is formed greater than a second change rate at which a degree of internal deformation resistance in the ice-releasing direction of the cell varies along the radial direction of the cell.

6. The refrigerator of claim 1, wherein the first wall includes a first region having a first thickness and a second region having a second thickness greater than the first thickness.

7. The refrigerator of claim 6, wherein in the first wall, a ratio occupied by the first region out of a total area combining the first region and the second region is formed greater than a ratio occupied by the second region.

8. The refrigerator of claim 6, wherein the second region is formed more adjacent to a center of the cell than to an opening of the tray wall, and the opening is a through-hole through which a solid-phase substance is discharged.

9. The refrigerator of claim 8, wherein the first region is formed more adjacent to the opening of the tray wall than to the center of the cell, and the opening is a through-hole through which a solid-phase substance is discharged.

10. The refrigerator of claim 8, wherein a size of the first region is configured to increase from the center of the cell toward the opening.

11. The refrigerator of claim 8, wherein the second region extends from the center of the cell toward the opening in a triangle, rhombus, arc, or inverted Y shape.

12. The refrigerator of claim 6, wherein the second region includes a first portion and a second portion extending in a circumferential direction, and at least a portion of the first region is located between the first portion and the second portion.

13. The refrigerator of claim 12, wherein when defining an extension line in a circumferential direction passing through a portion of the first wall, the extension line alternately passes through the first region and the second region.

14. The refrigerator of claim 6, wherein the second region includes a first rib extending in a circumferential direction of the first wall and a second rib connected to the first rib and extending toward an opening of the tray wall.

15. The refrigerator of claim 6, wherein the second region includes a rib extending in an ice-releasing direction from a center of the cell toward an opening of the tray wall.

16. The refrigerator of claim 15, wherein the rib includes a plurality of ribs arranged spaced apart in a circumferential direction, and the second region includes an additional rib connecting the plurality of ribs and extending in the circumferential direction.

17. The refrigerator of claim 6, wherein the first region and the second region are integrally molded, or the first region and the second region are provided as distinct regions and coupled.

18. The refrigerator of claim 17, wherein the first region and the second region are made of different materials so that a degree of internal deformation resistance of the first region and a degree of internal deformation resistance of the second region are formed differently.

19. The refrigerator of claim 1, wherein the tray wall includes an opening through which a solid-phase substance is discharged, and a diameter of the opening relative to a diameter of the cell is formed to be 70% or more and less than 100%.

20. The refrigerator of claim 1, further comprising a pusher for pressing the tray wall, wherein a hardness of the tray wall is determined to be a value greater than a first hardness and less than a second hardness such that an insertion depth of the pusher at which maximum ice-releasing force occurs is formed in a range of 14% to 35% relative to a diameter of ice.

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