KR101643635B1 - Method for Ice Making and Ice Maker Apparatus - Google Patents

Abstract

The present invention relates to an ice maker provided in a refrigerator, and more particularly, to an ice maker capable of preventing a phenomenon in which ice cubes are ice-melted through the ice maker, ≪ / RTI >

Ice, Ice, Fill, Ice bank, Ice

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an ice maker,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to an ice maker for ice making a shape of ice to be ice-formed through an ice maker provided in a refrigerator, and an ice making method using the same.

Generally, a refrigerator is provided with a main body having a freezing chamber F and a refrigerating chamber R partitioned by partition walls and a refrigeration cycle device for maintaining the freezing chamber F and the refrigerating chamber R at a low temperature.

The main body includes a freezing chamber door rotatably connected to the main body for opening and closing the freezing chamber, and a refrigerator chamber door for opening and closing the freezing chamber.

The refrigeration cycle apparatus includes a compressor (not shown) for compressing a low-temperature and low-pressure gas refrigerant, a condenser (not shown) for condensing the high-pressure refrigerant compressed in the compressor by radiating heat to the outside air, And an evaporator (not shown) in which the refrigerant adiabatically expanded in the expansion device is deprived of heat in the freezing chamber F and the refrigerating chamber R and evaporated.

In recent years, there has been a tendency to install an automatic ice maker for taking out ice after ice using cold air of the freezing room F to be taken out.

Description of the Related Art [0004] Ice used in a conventional ice maker will be described with reference to the drawings.

1, the ice formed in the conventional ice maker is ice-melted in a form having a crescent shape (a) or a rectangular shape (b), and the ice having the above shape A large number of ice banks are stored inside.

As described above, when the ice having a crescent moon or a rectangular shape is stored in the ice bank, there is a problem that the upper surface has a flat surface, so that the planes adhere to each other or become entangled with each other.

In such conventional ice, the volume of the ice is larger than that at the time of the first ice making, so that it is inconvenient for the user to throw out the entangled ice or to find a single ice that does not stick to each other. Respectively.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an ice maker capable of preventing ice from being iced through a refrigerator ice maker or from sticking to each other.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an ice maker capable of ice-making ice that is to be ice-fed through an ice maker.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a control method of an ice maker capable of improving the reliability and satisfaction of a consumer with respect to a refrigerator.

According to an aspect of the present invention, there is provided an ice maker comprising: a lower tray; A cover tray provided on the lower tray for ice-making the ice in an ice-making space formed by engagement with the lower tray; And a driving unit for moving the cover tray to perform ice making, and for rotating the lower tray so as to take out ice from which the ice-making is completed, thereby performing ice-making.

The cover tray is disposed to be accommodated in the lower tray.

The lower tray is provided with a first ice-making groove which is opened toward the upper part, and the cover tray has a second ice-making groove with a size corresponding to the first ice-making groove.

The lower tray further includes a first extension extending outwardly of the first ice-making groove and having a storage area for storing water.

The second ice-making groove may further include an air vent hole formed at the center of the upper surface of the second ice-making groove to discharge the air remaining in the ice-making space to the outside when the cover tray is coupled to the lower tray.

The cover tray further includes a second extension portion that extends outwardly of the second ice making groove and is bent at an end thereof.

The second extension portion may further include a guide member for guiding the movement direction of the water so that water is introduced into the first ice-making groove when the first extension portion is in contact with the first extension portion.

The guide member is inclined upward from the outer side of the second extending portion toward the inner side.

The guide member is made of an elastic material.

The cover tray is arranged to face the lower tray, and the lower end of the cover tray is downwardly moved to be coupled with the lower tray so that the first and second ice-making grooves are combined with each other.

The lower tray may further include a sealing member for preventing water overflow when the lower tray is coupled with the cover tray.

The sealing member is disposed inside the first extending portion.

The lower tray is provided with a flow path portion for moving water between the first and second ice making grooves.

And the flow path portions have different diameters.

The lower tray may further include a heating unit for separating the generated ice from the first and second trays.

The heating portion is disposed outside the cover tray.

The lower tray is made of a metal having a high thermal conductivity, and the cover tray is made of plastic.

The driving unit includes a first driving unit for moving the cover tray up and down; And a second driving unit for rotating the lower tray.

A water supply step of supplying water to the lower tray in a state where the cover tray is separated from the lower tray; The cover tray is operated so that water is introduced into the ice making space while the cover tray and the lower tray are combined; An ice making step of performing ice making so that ice is ice-picked; A heating step of heating to dissolve a part of the surface of the ice that has been iced; And an ice-making step for performing ice-making so that the ice cubes are separated from the lower tray.

Wherein the ice tray includes a first ice tray and a cover tray, And a second ice-making step in which the lower tray is rotated so that ice stored in the lower tray is released.

According to another aspect of the present invention, there is provided an ice maker comprising: an ice-making space forming step of forming an ice-making space by closely fitting a lower tray and a cover tray; A water supply step of supplying water to the ice making space; An ice making step of performing ice making in a state in which water supply is completed; A heating step of performing heating to dissolve a part of the surface of ice that has been iced, and an ice-making step of performing ice-making so that the ice cubes are separated.

As described above, the ice making device and the ice making method using the ice making device according to the present invention have the effect of enabling the ice to be retained circularly by preventing the ice from being iced or adhered to each other through the ice making device.

The ice maker and the ice making method using the ice maker according to the present invention can provide a refrigerator equipped with an ice maker capable of ice-making spherical ice.

The ice maker and the ice maker using the ice maker according to the present invention provide a refrigerator which is easy to use by a consumer, so that satisfaction and reliability of the product can be improved.

Hereinafter, embodiments of the ice making device and the ice making method using the same according to the present invention will be described with reference to the accompanying drawings. For convenience of explanation, the ice tray will be described based on a single arrangement.

2 to 3, the icemaker according to the present invention includes an ice tray 100 for forming an ice-making space while selectively coupling a lower tray 110 and a cover tray 120 to each other. The ice-making tray 100 includes a lower tray 110 for receiving water through the water supply unit 300 for deicing ice in the ice-making space and ice having a spherical or elliptical shape, And a cover tray (120) disposed opposite to the cover tray (110).

The lower tray 110 is provided with a shaft at one side relative to the longitudinal direction of the lower tray so as to be rotatable inside the ice maker and a support shaft at the other side.

The shaft is connected to a driving unit 200 to be described later, and rotatably supports the lower tray 110. The supporting shaft is supported and fixed inside the housing when the lower tray 110 is rotated.

The cover tray 120 is installed on the housing so as to be vertically movable in a state where the cover tray 120 is disposed on the upper side of the lower tray 110.

The water supply unit 300 for supplying water to the ice-making tray 100 may have a water supply structure that is conventionally used or may have a separate structure. This will be described later.

The cover tray 120 is disposed to be accommodated in the lower tray 110. This is because the lower tray 110 and the cover tray 120 must be disposed such that the spherical shape is maintained in order to ice the spherical ice and the cover tray 120 must be accommodated in the lower tray 110, This is because the sphere shape is maintained along with the water supply.

The lower tray 110 is provided with a hemispherical first ice-making groove 112 which is opened toward the upper part. The cover tray 120 is provided with a hemispherical second ice-making chamber 112 having a size corresponding to the first ice- Grooves 122 are formed.

The lower tray 110 further includes a first extension 114 extending outwardly of the first ice making groove 112 and having a storage area for storing water, 1 extending outwardly of the ice-making groove 112.

The first extension part 114 is a place where water to be introduced into the first ice making groove 112 is temporarily stored, and the extension length extending outward according to the size of the first ice making groove 112 can be changed .

The reason why the first extension portion 114 is bent upward is to prevent a phenomenon of overflowing when water flows in through the water supply portion 300.

The second ice-making groove 122 provided in the cover tray 120 further includes an air vent hole 122a at the center of the upper surface. The air vent hole 122a is provided to discharge the air remaining in the ice-making space to the outside.

The reason why the air vent hole 122a is located at the center of the upper surface of the cover tray 120 is that when the lower tray 110 and the cover tray 120 are engaged, And even if the excess water is overflowed through the air vent hole 122a in a state where water is entirely introduced into the second ice making groove 122, the air vent hole 122a is communicated with the second ice making groove 122 In order to minimize it.

Although the size and the number of the air vent holes 122a are not particularly limited, they may be positioned as shown in the drawings for the purpose of stable air discharge, or may be changed to other forms.

The lower tray (110) is provided with a flow path portion (111) for moving water between the first and second ice making grooves (112). The flow paths 111 may have the same diameter or different diameters.

In order to stably supply water to the inside of other ice-making grooves disposed apart from the first ice-making groove 112 disposed adjacent to the water-supplying unit 300, May be made to have a diameter that is relatively larger than the diameter of the spaced apart flow paths.

It is noted that the change in the diameter of the flow path portion 111 is finely changed because the water is stably introduced into the first ice making groove 112 in which a plurality of spaced-apart first ice making grooves 112 are arranged.

Further, when the first ice-making grooves 112 are arranged in two rows, it is also possible that a bridging flow path connecting the first ice-making grooves 112 is further provided. The bridging flow path is provided in addition to the flow of the water through the flow path portion 111 so as to more stably and promptly inflow the water.

The first extension 114 may extend upwardly toward the outside of the first ice-making groove 112. The second extending portion 124 is also made to be symmetrical with respect to the first extending portion 114.

Referring to FIG. 4, the cover tray 120 further includes a second extending portion 124 extending outwardly of the second ice making groove 122 and having an end bent upward.

The cover tray 120 may be configured such that even when the water overflows through the air vent hole 122a, the portion of the water overflowed by the upwardly bent second extension portion 124 is floated to the outside of the cover tray 120 It is prevented from flowing down or flowing into the housing.

The second extension part 124 further includes a guide member 124a for guiding the movement direction of the water so that water flows inward of the first ice making groove 112 when the first extension part 114 is in contact with the second extension part 124 do. The guide member 124a guides the water accommodated in the first extension portion 114 to be moved toward the first ice making groove 112. [

The guide member 124a is inclined upward from the outer side of the second extending portion 124 toward the inner side, and is made of a material having an elastic force. For example, rubber or silicone can be used, and materials harmless to human body are used.

The reason why the guide member 124a is inclined is that the guide member 124a is sequentially contacted from the outermost portion of the first extension portion 114 to the position of the first ice making groove 112, To move the water to where it is located.

The ice making space formed by the first and second ice making grooves 112 and 122 is combined with the lower tray 110 so as to be formed in a spherical shape so as to be engaged with the lower tray 110 .

The ice-making tray 100 is provided with a sealing member 102 for preventing water overflow.

The sealing member 102 is disposed inside the first extending portion 114. In other words, the first extended portion 114 is provided on the bent inner side of the first extended portion 114, thereby causing a sealing effect by surface contact with the guide member 124a, thereby preventing water overflow in the ice-making tray 100.

The ice tray 100 is provided with a heating unit 400 so that the generated spherical ice is separated from the lower tray 110 and the cover tray 120.

The heating unit 400 is disposed outside the cover tray 120. Preferably, the first and second ice-making grooves 122 may be disposed closely to the outside of the second ice-making groove 122, or may be spaced apart from each other by a predetermined distance.

The heating unit 400 uses a resistance heating element that is operated by electricity, but it can be replaced with another heating element.

According to another embodiment of the heating unit 400, the lower tray 110 and the cover tray 120 are disposed outside the contact portion in contact with each other. Specifically, it is disposed on the second extension portion 124 of the cover tray 120. The reason for this arrangement is that when heating is performed from the center of the outside of the ice to be ice-formed into a spherical shape, the ice is smoothly smoothed out.

The lower tray 110 is made of a metal having a good thermal conductivity, and the cover tray 120 is made of plastic. For example, the lower tray 110 is preferably made of aluminum.

The driving unit 200 includes a first driving unit 210 for moving the cover tray 120 up and down; And a second driving unit 220 for rotating the lower tray 110.

A rack gear (not shown) may be disposed to elevate the first driving unit 210 by a motor provided separately or a guide bar may be provided on one side of the cover tray 120 to lift the entire cover tray 120 toward the lower tray 110 have.

The second driving unit 220 is configured to couple a plurality of gears and the lower tray 110 is rotated at an angle of 90 degrees or more by the combination of the gears so that the first ice-making groove 112 faces downward.

The control method for controlling the driving apparatus according to the present invention includes a water supply step ST100 in which water is supplied to the lower tray 110 in a state where the cover tray 120 is separated from the lower tray 110; (ST200) in which the cover tray 120 is operated to allow water to flow into the ice making space while the cover tray 120 and the lower tray 110 are combined; An ice making step (ST300) of performing ice making so that ice is ice-picked; A heating step (ST400) for heating to dissolve a part of the surface of ice that has been iced; And an ice-making step (ST500) for ice-making so that the ice cubes are separated from the lower tray (110).

The unloading step (ST500) includes a first unloading step in which the cover tray is preferentially moved among the lower tray and the cover tray provided in the ice-making tray; And a second ice-making step in which the lower tray is rotated so that ice stored in the lower tray is released.

The ice making method of an ice maker according to another embodiment of the present invention includes an ice making space forming step ST100 'in which a lower tray 110 and a cover tray 120 are in tight contact with each other to form an ice making space; A water supply step (ST200 ') in which water is supplied to the ice making space; An ice making step (ST300 ') for performing ice making in a state in which water supply is completed; A heating step (ST400 ') in which heating is performed to dissolve a part of the surface of ice that has been iced; And an ice-making step (ST500 ') for ice-making so that the ice cubes are separated.

The first control method out of two embodiments according to the control method of the ice maker is a method in which the ice tray is combined with the ice tray after the water supply is performed in a state where the lower tray and the cover tray are separated from each other. And shows how the water is supplied later when the tray and the cover tray are combined.

The main difference between the two control methods is the timing at which the timing of the feed is performed.

The operation of the ice making device and the ice making method using the ice making device according to the present invention will be described with reference to the drawings.

Referring to FIG. 4, the controller controls the lower tray 110 in a state as shown in the figure so that water is stably supplied to the lower tray 110 before the water is supplied through the water supply unit 300 And the cover tray 120 operates the first driving part 210 and the second driving part 220 such that the cover tray 120 is spaced apart from the upper surface of the lower tray 110 by a predetermined distance.

Although not particularly limited, the spacing distance of the cover tray 120 is spaced within the layout range of the housing.

In the above state, the water introduced through the water supply unit 300 starts to be supplied to the lower tray 110 (ST100). The amount of water supplied to the water supply unit 300 through a separate flow sensor is detected or the amount of water supplied to the lower tray 110 is controlled so as to be supplied to the lower tray 110 do.

The water introduced into the lower tray 110 is supplied to the other first ice-making grooves spaced apart from the water supply part 300 through the channel part 111.

When the water is supplied to the first ice making grooves 112 (see FIG. 2), the flow path portion 111 is connected to the other first ice making grooves so as to allow water to flow, And water is supplied to the groove 112.

After the water is supplied to the first ice-making groove 112, the water is stored in the first extension portion 114 having the storage region. The water stored in the first extension portion 114 is stored only in an amount that flows into the second ice-making groove 122, which will be described later.

5, when the water supply is completed, the control unit operates the first driving unit 210 so that the lower tray 110 and the cover tray 120 have a sphere shape, (110).

The lower tray and the cover tray operate as follows.

The driving unit 200 operates the first driving unit 210 to gradually lower the cover tray 120 toward the lower tray 110 so that the cover tray 120 is moved toward the lower tray 110.

At this time, it is preferable that the cover tray 120 in close contact with the upper surface of the lower tray 110 is closely contacted with the lower tray 110 while maintaining the same surface pressure.

A state in which water supplied to the lower tray is moved to the cover tray will be described.

The guide member 124a is sealingly engaged with the sealing member 102 while being in surface contact with the lower surface of the lower tray 110. Even when the cover tray 120 is in close contact with the lower tray 110, To prevent water overflow.

The guide member 124a is made of silicon having elasticity and elastically deformed as described above to prevent the formation of a gap between the first extension portion 114 and the second extension portion 124. [

As the cover tray 120 is lowered, the water stored between the first extension portion 114 and the second extension portion 124 by the guide member 124a passes through the first ice-making groove 112 .

6 to 7, the cover tray 120 is in close contact with the lower tray 110, and one surface of the guide member 124a is in contact with the upper surface of the first extending portion 114. As shown in FIG.

The guide member 124a is in contact with the first extended portion 114 from the bent position corresponding to the outermost point of the extended portion.

The water stored in the first extension portion 114 is entirely moved in the direction of the first ice-making groove 112 when the first drive portion 210 is continuously downwardly moved downwardly of the cover tray 120, The lower tray 110 and the cover tray 120 are closely contacted with the upper surface of the first extending portion 114 from the bending point of the first extending portion 114 to the inner side, (ST200).

The water located in the first extension part 114 flows into the second freezing space 122 and the air inside the second freezing space 122 flows through the air discharge hole 122a As shown in Fig.

When ice is to be ice-formed in a spherical shape, air may remain in the ice making room, or ice may be deteriorated if the ice is not properly discharged, and ice may be chipped after ice making, so that air can be stably discharged through the air- .

Also, when the air is discharged to the outside of the second ice-making groove 122 through the air-discharging hole 122a, even if water overflows outside the air-discharging hole 122a, the second extending portion 124 So that it does not flow to the outside of the cover tray 120 or the inside of the housing.

Referring to FIG. 8, when the cover tray 120 is kept in tight contact with the lower tray 110, the cool air is supplied from the upper side of the cover tray 120 to start ice-making (ST300).

The cover tray 120 is made of aluminum so that the cool air supplied to the cover tray 120 can be quickly transmitted to the lower tray 110. In order to quickly freeze ice from the ice tray 100, .

The cover tray 120 is moved along the outer side of the cover tray 120 in which the supplied cool air is made in the shape of a sphere and can stay in the cover tray 120 for a long time by the bent structure of the second extension portion 124 .

Referring to FIG. 9, when the ice making is completed, the controller applies power to the heating unit 400 to freeze the ice cubes of the ice making tray 100 to melt the interface of the ice cubes (ST400).

The heating unit 400 may be disposed between the second extension unit 124 provided in the cover tray 120 and the air vent hole 122a or may be disposed on the second extension unit 124. [

In the latter case, when the heating unit 400 is heated, heat conduction is performed through the upper and lower contact surfaces of the lower tray 110 and the cover tray 120, respectively, so that the ice surface and the first and second freezing grooves 112 and 122 ) Is uniformly melted, so that more smooth deicing can be achieved.

Water may be partially penetrated at the point where the first extension portion 114 and the second extension portion 124 are in contact with each other at the time of the ice making. However, as the heating is performed by the heating portion 400, By freezing the frozen portion, it is possible to stably release the ice during the freezing process to be described later.

The ice-making state in the ice-making tray will be described with reference to the drawings.

Referring to FIG. 10, the control unit operates the first driving unit 210 to separate the cover tray 120 from the lower tray 110 and lift the cover tray 120 upward.

The height at which the cover tray 120 is raised is relatively higher than the height at which the cover tray 120 is separated when water is supplied to the initial lower tray 110.

This is because the lower tray 110 needs to be rotated in order to freeze the ice in the lower tray 110 into the ice bank, so that the cover tray 120 operates as described above.

Since the ice is already melted by the heating unit 400 at the contact point between the first extended portion 114 and the second extended portion 124 when the ice tray is separated from the ice tray, 110).

11, the control unit operates the second driving unit 220 to rotate the lower tray 110 (in a state), while moving the cover tray 120 upward, and moves the lower tray 110 (ST500).

In the rotated lower tray (110), the ice that has been dispensed in the first ice-making groove (112) is stored in the ice-making tray by its own weight. The stored ice has a spherical shape so that the contact surface where the ice is in contact with each other is minimized even under the condition that a plurality of the ice are housed, so that they are not tangled or stuck to each other.

The guide member 124a and the sealing member 102 described in this embodiment can be used in a state where they are not yet installed.

Another embodiment of the ice making method of the ice making device according to the present invention will be described with reference to the drawings.

According to another embodiment of the present invention, the control unit controls the driving unit 200 so that the lower tray 110 and the cover tray 120 are first coupled (ST100 ') without water being preferentially supplied to the lower tray 110. [ do.

The reason for this is as follows. When water is injected in the state where the ice-making tray 100 first forms the ice-making space, freezing at the surface-contacted portions of the first and second extensions 114 and 124 is prevented, Speed can be improved.

The water supplied through the water supply part 300 may be injected through the air vent hole 122a or may be injected through a separate water supply hole (not shown) for water supply, in the state where the lower tray 110 and the cover tray 120 are coupled as described above. Not shown) (ST200 ').

In the present embodiment, the water supply hole is not shown, and the diameter of the air discharge hole is changed to explain the water supply hole and the air discharge hole at the same time.

When the water supply is completed, the cool air is supplied to the upper portion of the cover tray 120 to perform ice-making (ST300 ').

When the ice-making is completed, the controller applies power to the heating unit 400 to dissolve the ice interface (ST400 '), and lifts the cover tray to the upper portion of the lower tray 110.

Then, the lower tray 110 may be rotated to store the ice into the ice bank (ST500 ').

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation in the scope of the appended claims. It will be understood by those skilled in the art that various modifications may be made and equivalents may be resorted to without departing from the scope of the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a shape of ice to be ice-melted in a conventional ice maker. FIG.

2 is a perspective view showing an ice maker according to the present invention;

3 is a front view of an ice maker according to the present invention;

4 is a sectional view showing an ice-making tray according to the present invention;

5 to 11 are operational states of the ice-making tray according to the present invention.

12 is a flowchart showing a control method of an ice maker according to the present invention;

13 is a flowchart showing another embodiment of the method for controlling an ice maker according to the present invention.

Description of the Related Art [0002]

100: Ice-making tray 110: Lower tray

112: first ice making groove 120: cover tray

122: second ice making groove 122a: air vent hole

124: second extension part 124a: guide member

400: a heating unit 200: a driving unit

Claims (21)

A lower tray having a hemispherical first ice making groove; A cover tray having a hemispherical second ice-making groove facing the first ice-making groove and being selectively engaged with the lower tray to form an ice-making space; A heating unit disposed outside the cover tray for heating the cover tray to separate the generated ice; A first driving unit for raising the cover tray to separate the tray from the lower tray and lowering the cover tray so that the first and second ice-making grooves join together to form a sphere; And And a second driving unit for rotating the lower tray by 90 degrees or more so that the first ice-making groove is directed downward, thereby to freeze the ice cubes. The method according to claim 1, Wherein the cover tray is disposed to be accommodated in the lower tray. delete The method according to claim 1, The lower tray Further comprising a first extension portion extending outwardly of the first ice making groove and having a storage region for storing water. The method according to claim 1, The second ice- Further comprising an air vent hole provided at the center of the upper surface of the second ice making groove for discharging the air remaining in the ice making space to the outside when the cover tray is coupled to the lower tray. 5. The method of claim 4, The cover tray includes: Further comprising: a second extension portion extending outwardly of the second ice-making groove and having an end bent. The method according to claim 6, The cover tray includes: Further comprising a guide member provided on a lower surface of the second extending portion and guiding water to flow in an inner direction of the first ice making groove when the upper surface of the first extending portion contacts the upper surface of the first extending portion. 8. The method of claim 7, The guide member And the second extension portion is inclined upward from the outer side toward the inner side of the second extension portion. 8. The method of claim 7, Wherein the guide member is made of an elastic material. The method according to claim 1, The cover tray includes: Wherein the second tray is lowered in a state where it is disposed to face the lower tray and is coupled to the lower tray, and the ice-making space in which the first and second ice-making grooves are combined is formed in a spherical shape. The method according to claim 6, The lower tray includes: Further comprising: a sealing member provided on an inner surface of the first extending portion to closely contact an outer surface of the second extending portion when the cover tray is engaged with the cover tray to prevent overflow of water. delete The method according to claim 1, The lower tray Wherein a flow path portion is provided to allow water to move between the first ice-making grooves in which a plurality of the ice-making grooves are spaced apart from each other. 14. The method of claim 13, The flow- Wherein the first and second heat exchangers have different diameters. delete delete The method according to claim 1, Wherein the lower tray is made of a metal having a high thermal conductivity, Wherein the cover tray is made of plastic. delete The control method for an ice maker according to claim 1, A water supply step of supplying water to the lower tray in a state where the cover tray is separated from the lower tray; Lowering the cover tray to allow water to flow into the ice-making space generated when the cover tray and the lower tray are coupled to each other; An ice making step of supplying ice to the lower tray and the cover tray to produce ice; A heating step of heating to melt a part of the surface of the ice cubes; And And an ice-making step of separating ice made between the lower tray and the cover tray. The control method for an ice maker according to claim 1, Forming an ice-making space by lowering the cover tray to closely contact the lower tray and the cover tray to form an ice-making space; A water supply step of supplying water to the ice making space; An ice making step of supplying ice to the lower tray and the cover tray to produce ice; A heating step of heating to melt a part of the surface of the ice cubes; And And an ice-making step of separating ice made between the lower tray and the cover tray. 21. The method according to claim 19 or 20, The freezing step A first ice-making step for raising the cover tray; And a second ice-making step for rotating the lower tray by 90 degrees or more to allow ice to fall off.

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