KR102442820B1 - Ice maker - Google Patents

Abstract

An objective of the present invention is to provide a pressing-type ice maker capable of simplifying the structure and operation of the ice maker. According to an embodiment of the present invention, a refrigerator comprises: an upper tray provided with an upper cell; and a lower tray having a lower cell forming an ice cell together with the upper cell, and being rotatable with respect to the upper tray. The lower tray includes: a tray body having the lower cell, an extension end extending radially from an upper surface edge of the lower cell, and a guide wall extending upward from an end of the extension end; and a lower frame passing through the lower cell and supporting the extension end.

Description

Ice maker {Ice maker}

The present invention relates to an ice maker provided in a refrigerator.

BACKGROUND ART In general, a refrigerator is a home appliance that can store food at a low temperature in an internal storage space that is shielded by a door. The refrigerator is configured to store stored foods in a refrigerated or frozen state by cooling the inside of the storage space using cold air.

In addition, an ice maker for making ice is usually provided inside the refrigerator. The ice maker is configured to make ice by receiving water supplied from a water supply source or a water tank in an ice tray. In addition, the ice maker is configured to transfer ice that has been made ice from the ice tray by a heating method or a twisting method.

The ice maker, which is automatically supplied with water and ice in this way, is formed to open upward and has a structure for scooping up molded ice. In addition, ice made in the ice maker having such a structure is made of ice having at least one flat surface, such as a crescent shape or a cubic shape.

On the other hand, when the shape of the ice is formed in a spherical shape, it may be more convenient to use the ice, and it is possible to provide a different feeling of use to the user. In addition, even when storing ice made from ice, it is possible to minimize ice agglomeration by minimizing the contact area between the ices.

Meanwhile, Japanese Patent Application Laid-Open No. 2008-170086 discloses an ice maker capable of making three-dimensional ice such as beads or spheres by using a detachable plate-shaped ice maker.

However, the ice maker disclosed in Japanese Patent Application Laid-Open No. 2008-170086 relates to a manual ice maker, and since spherical ice has to be manufactured by manual operation, it causes inconvenience in use and insufficient amount of ice.

Meanwhile, in an ice maker that manufactures spherical ice, the upper portion of the tray must be sealed during the ice making process due to the external characteristics of the spherical ice. However, since an open structure is required for ice transfer, an upper tray and a lower tray are necessarily present, respectively. In a pressing type ice maker that receives water from the lower tray and presses the upper tray, the water supply process is easy, but in order to prevent water from leaking to the outside during the pressing process, a straight lifting movement of the lower tray is required. In addition, a rotational movement of the lower tray is required to prevent ice from being separated from the upper tray and staying in the lower tray without falling into the ice bank during the ice-moving process. That is, in the case of the pressing type ice maker, a driving structure is required so that the lower tray performs linear and rotational motions in parallel, so the ice maker structure is complicated.

The present invention has been proposed to improve the above problems, and it is possible to simplify the structure and operation of the ice maker by allowing the lower tray to perform only rotational motion without the need for linear motion during the ice making and ice making process, thereby simplifying the structure and operation of the ice maker. The purpose is to provide manufacturers.

A refrigerator according to one aspect includes: an upper tray provided with an upper cell; and a lower tray having a lower cell forming an ice cell together with the upper cell, and being rotatable with respect to the upper tray.

The lower tray may include: a tray body including the lower cell, an extension end extending in a radial direction from an edge of an upper surface of the lower cell, and a guide wall extending upwardly from an end of the extension end; and a lower frame through which the lower cell passes and supporting the extended end.

The lower frame includes a tray body seating portion having a hole through which the lower cell passes, and the tray body seating portion is in contact with the lower cell.

The lower tray further includes an upper frame mounted on the tray body.

In a state in which the upper tray and the lower tray are in contact, the upper frame surrounds the upper tray.

The upper tray includes a round portion for preventing interference with the lower tray. A portion corresponding to the round portion in the lower tray is formed to be round.

A portion of the upper tray has a variable thickness such that the thickness increases toward the upper side. In a state in which the upper tray and the lower tray are in contact with each other, the lower tray surrounds a variable thickness portion of the upper tray.

The upper tray may include an air hole, and a diameter of the air hole may be formed to be greater than a thickness of the tray body.

The upper tray may further include an icing heater disposed around the air hole.

The apparatus may further include an upper ejecting pin assembly for separating the ice formed in the ice cell from the upper tray, and a link for moving the upper ejecting pin assembly while the lower tray rotates.

The upper tray may include an air hole through which the upper ejecting pin assembly passes.

The upper tray may further include a link guide unit provided with a guide hole for guiding the movement of the link.

According to the ice maker according to the embodiment of the present invention having the configuration as described above, the following effects are obtained.

After water is supplied to the lower tray for ice production, there is an advantage in that the pressing process is performed only by rotating the lower tray around the rotation axis without the need to linearly move the lower tray in order to bring the upper tray and the lower tray into close contact.

Accordingly, there are advantages in that the driving mechanism for controlling the operation of the lower tray is simplified, the manufacturing cost is reduced, and the failure rate of the ice maker is lowered. Furthermore, since the linear movement process of the lower tray is omitted, there is an advantage in that the ice production time is shortened.

1 is an external perspective view of an ice maker according to an embodiment of the present invention in an ice making process;
2 is an external perspective view of an ice maker according to an embodiment of the present invention in a state of complete ice transfer;
3 is an exploded perspective view of an ice maker according to an embodiment of the present invention;
4 is a bottom view of an upper tray constituting an ice maker according to an embodiment of the present invention;
5 is a plan view of an upper frame constituting an ice maker according to an embodiment of the present invention;
Fig. 6 is a side cross-sectional view of the ice maker taken along II of Fig. 1 in the state of water supply;
7 is an enlarged view of part A of FIG. 6 ;
Fig. 8 is a side cross-sectional view of the ice maker taken along II of Fig. 1 in an ice-making state;
9 is a side cross-sectional view of the ice maker taken along II of FIG.
10 is a flowchart illustrating an ice manufacturing process of an ice maker according to an embodiment of the present invention.

Hereinafter, a structure of an ice maker according to an embodiment of the present invention and an ice manufacturing process using the ice maker will be described in detail using drawings and flowcharts.

Hereinafter, a pressing-type ice maker will be described as an example, and the pressing-type ice maker is a type of ice that receives water from a lower tray and then performs an ice-making process while keeping the lower tray in close contact with the upper tray to prevent water leakage. defined as a maker.

1 is an external perspective view of an ice maker according to an embodiment of the present invention in an ice making process, FIG. 2 is an external perspective view of an ice maker according to an embodiment of the present invention in a state of complete ice removal, and FIG. 3 is an embodiment of the present invention It is an exploded perspective view of an ice maker according to an example.

1 to 3 , an ice maker 10 according to an embodiment of the present invention includes an upper tray 11 responsible for forming ice in an upper hemisphere region based on a horizontal plane that bisects spherical ice, and a lower hemisphere The lower tray 12 responsible for forming area ice, the water supply tray 16 provided above the upper tray 11 to supply ice-making water, and the water supplied from the water supply tray 16 are A water supply guide 17 to guide the lower tray 12, an ice heater 18 seated on the upper surface of the upper tray 11 to heat the upper tray for ice drift, and the ice heater 18 An ice-making pipe 30 provided inside or outside of a rotation shaft 21 that rotatably connects to the upper tray 11, a link 22 having one end connected to the upper ejecting pin assembly 19 and the other end connected to the lower tray 12, and the and a lower ejecting pin 20 for separating ice attached to the lower tray 12 .

In detail, the rear end of the lower tray 12 is rotatably coupled to the rear end of the upper tray 11 by the rotation shaft 21 . In addition, a link connecting end 136 protrudes from a point of the lower tray 12 corresponding to a straight distance from the rotation shaft 21 . The other end of the link 22 is connected to the link connection end 136 to elevate the upper ejecting pin assembly 19 during the rotation of the lower tray 12 .

In this case, the rotating shaft 21 may be called a rotating part.

In more detail, the lower tray 12 includes a tray body 14 in which a plurality of lower cells 141 are formed, and a lower frame in which a tray body seating part 151 for seating the tray body 14 is formed. (15) and an upper frame 13 to which the tray body 14 and the lower frame 15 are fixed to the bottom surface.

The tray body seating part 151 formed inside the lower frame 15 includes a plurality of holes through which the lower cells 141 of the tray body 14 pass, and is formed at the edge of the hole to pass through the tray body. (14) is made of a stepped portion to be caught.

In addition, in the tray body 14, a plurality of lower cells 141 are arranged in a plurality in a hemispherical shape. In addition, an extension end 143 (refer to FIG. 7 ) extends from the upper surface edge of the lower cell 141 in a radial direction, and the guide wall 142 extends to a predetermined height from the end of the extension end 143 . The extension end 143 and the guide wall 142 are seated on the tray body seating portion 151 of the lower frame 15 to prevent the tray body 14 from being separated from the lower frame 15 . . A plurality of lower ejecting pins 20 corresponding to the number of the lower cells 141 horizontally protrude from the lower side of the lower tray 12 . The lower cells 141 pass through the lower frame 15 and are exposed to the outside. Accordingly, when the lower tray 12 is rotated downward for the purpose of icing, the bottom surfaces of the lower cells 141 are pressed by the lower ejecting pin 20 . The lower cells 141 may be formed of a flexible plastic member having a property of being restored to an original state after deformation. Accordingly, the spherical ice attached to the lower cell 141 is separated by the lower ejecting pin 20 pressing the bottom surface of the lower cell 141 .

In addition, the rotating shaft 21 is inserted through the rear end of the upper frame 13, specifically, both edges of the rear end. In addition, link connecting ends 136 protrude from both sides of the rear end of the upper frame 13 .

In addition, a plurality of upper cells 113 having a hemispherical shape are arranged on the upper tray 11 , and the plurality of upper cells 113 are in close contact with the lower cells 141 of the tray body 14 inside to form a spherical space.

That is, the plurality of lower cells 141 and the plurality of upper cells 113 form a spherical ice cell.

A guide sleeve 114 for forming an air hole 115 protrudes from an upper surface of the upper cells 113 , respectively. And, an end of the water supply guide 17 is fitted to the outer peripheral surface of any one of the plurality of guide sleeves 114 . In detail, a sleeve having the same outer diameter as the outer diameter of the guide sleeve 114 is formed at the outlet side end of the water supply guide 17, so that the water supplied from the water supply tray 16 does not leak to the outside and the lower cell ( 141) to be supplied.

In addition, a link guide part 111 extends upward a predetermined length on the left and right edges of the upper tray 11 . In addition, a guide hole 112 has a predetermined width and extends in the vertical direction inside the link guide part 111 .

Meanwhile, the ice-making pipe 30 and the ice-making heater 18 are placed on the upper surface of the upper tray 11 . In detail, when the water supply is completed and the lower tray 12 is in close contact with the upper tray 11 , a low-temperature refrigerant flows into the ice making pipe 30 . The ice making pipe 30 is branched at a point between the outlet of the expansion valve (not shown) constituting the refrigeration cycle and the inlet of the evaporator (not shown), and an on/off valve is installed at the inlet side of the ice making pipe 30 . can Accordingly, when ice making is started, the on/off valve is opened, and a portion of the refrigerant discharged from the expansion valve flows into the ice making pipe 30 . Then, as the upper tray 11 in contact with the ice-making pipe 30 is cooled, the water stored in the cells is frozen. Here, not only the refrigerant flowing into the ice making pipe 30 for ice making, but also the cold air supplied from the evaporator may be supplied to the ice maker 10 together.

In addition, when the ice making is completed, an ice moving process is performed, and when the ice starts moving, the ice moving heater 18 is operated. In detail, the surfaces of the upper cells 113 are heated by the heat generated from the ice heater 18 , and as a result, the ice attached to the upper cells 113 is slightly melted and separated.

In addition, the upper ejecting pin assembly 19 includes a plurality of upper ejecting pins 192 and a pin body 191 to which the plurality of upper ejecting pins 192 are attached. In detail, guide protrusions 193 protrude from both ends of the pin body 191 , and a link connecting end 194 further extends from the guide protrusions 193 . The guide protrusion 193 is inserted into the guide hole 112 formed in the link guide part 111 to ascend or descend along the guide hole 112 . In addition, one end of the link 22 is connected to the link connecting end 194 . In addition, the plurality of upper ejecting pins 192 are respectively formed at points penetrating the air hole 115 formed on the upper surface of the upper cell 113 . Accordingly, when the plurality of upper ejecting pins 192 descend, they pass through the air hole 115 to push the ice attached to the upper cell 113 .

4 is a bottom view of an upper tray constituting an ice maker according to an embodiment of the present invention.

Referring to FIG. 4 , a plurality of upper cells 113 are adjacently disposed inside the upper tray 11 according to an embodiment of the present invention, and are convexly rounded in a hemispherical shape.

In addition, an air hole 115 is formed in the upper surface of each upper cell 113 . In addition, the rear portion of the edge of the upper cell 113 is formed such that the rotation guide 116 is curved to a predetermined curvature. The rotation guide part 116 may be referred to as a round part. In addition, the upper tray 11 is formed with a rotation shaft connecting portion 117 at the left and right side ends of the rear end, respectively. Both ends of the rotation shaft 21 are inserted through the rotation shaft connection part 17 so that the lower tray 12 is rotatably connected. The rotation shaft connection part 117 is formed at a point spaced apart from both side edges of the upper tray 11 , and the rotation shaft connection part 135 formed at the rear end edge of the upper frame 13 is placed in the separation space. Accordingly, both ends of the rotation shaft 21 are sequentially inserted through the rotation shaft connection part 117 of the upper tray 11 and the rotation shaft connection part 135 of the upper frame 13 , respectively.

The function of the rotation guide unit 116 will be described in more detail below with reference to the drawings.

5 is a plan view of an upper frame constituting an ice maker according to an embodiment of the present invention.

Referring to FIG. 5 , the upper frame 13 is a component constituting the lower tray 12 and is seated on the upper surface of the tray body 14 . Then, the tray body 14 and the lower frame 15 are fixed to the bottom of the upper frame 13 .

In detail, the rotation shaft connection part 135 is formed to protrude from both ends of the rear end of the upper frame 13 , and the link connection end 136 protrudes from the outer surface of the rotation shaft connection part 135 .

In addition, the communication holes 131 having the same diameter as the top surface of each of the lower cells 141 formed in the tray body 14 are arranged inside the upper frame 13 . In detail, the communication holes 131 are placed on upper surfaces of the lower cells 141 , and lower surfaces of the upper cells 113 of the upper tray 11 are placed on the upper surfaces of the communication holes 131 , respectively. . In addition, a stepped portion 132 is formed at the edges of the communication holes 131 . When the water is filled to the level corresponding to the height of the stepped portion 132 , the lower tray 12 is rotated so as to be in close contact with the upper tray 11 .

On the other hand, the rear edge of the communication holes 131 is formed with a rotation guide portion 133 that is curved to a predetermined curvature unlike the front edge. In other words, the step portion 132 extending horizontally and vertically from the edge of the communication hole 131 is formed in the front region of the communication holes 131 , while the communication hole 131 is formed in the rear region. After extending horizontally from the edge, a stepped portion that is curved upward with a predetermined curvature, that is, the rotation guide portion 133 is formed. The curvature of the rotation guide part 133 is the same as the curvature of the rotation guide part 116 formed in the upper tray 11 . And, when the lower tray 12 rotates, the rotation guide part 133 of the upper frame 13 rotates while in contact with the rotation guide part 116 of the upper tray 11 .

At this time, the stepped portion 132 formed in the front region of the communication holes 131 may be referred to as a front stepped portion or a first stepped portion, and the stepped portion formed in the rear region of the communication holes 131 . It may be called a rear stepped portion or a second stepped portion.

In addition, in a portion adjacent to the plurality of communication holes 131 , a water runner 134 is formed in which the stepped portion 132 and the rotation guide portion 133 are cut off. As shown, the rotation guide part 133 and the stepped part ( 132), the water bone is formed. This is possible because the lower tray is a pressing type ice maker in which the upper tray is in close contact with the water supply completed. In addition, since the width and height of the water trough 134 are sufficiently large, water overflowing to the outside of the tray does not occur even if the water supply speed is fast.

For example, in the case of a reservoir type ice maker in which water is supplied while the upper tray and the lower tray are in close contact with each other to form a complete sphere, water is supplied from the cell corresponding to the water supply point to the adjacent cells. The water trough for this transfer should be formed in the form of a depression in the upper tray and/or the lower tray. In addition, when the width or depth of the water trough is too small, a water overflow phenomenon may occur because the transfer rate of water moving to the adjacent cell is too slow compared to the water supply rate. Conversely, if the width or depth of the water trough is too large, the finished ice may not form a spherical shape, and adjacent ice may be clumped together and not separated.

6 to 9 are operational state diagrams of the ice maker showing the process from watering to ice-breaking. FIG. 6 is a side cross-sectional view of the ice maker cut along II-I of FIG. 8 is a side cross-sectional view of the ice maker cut along I-I of FIG. 1 in an ice-making state, and FIG. 9 is a side cross-sectional view of the ice maker cut along I-I of FIG.

6 and 7 , just before water supply starts, the lower tray 12 is in a state rotated by a predetermined angle downward from a horizontal state as shown. That is, the lower tray 12 is supplied with water while being separated downwardly from the upper tray 11 . The position of the lower tray 12 in FIG. 6 for water supply may be referred to as a water supply position.

As described above, in the ice maker 10 according to the embodiment of the present invention, after the lower tray 12 is filled with water for ice making, the lower tray 12 is closely attached to the upper tray 11 to make ice. is the maker

Accordingly, water is supplied in a state where the lower tray 12 is slightly inclined to be spaced apart from the upper tray as shown. And, as shown in FIG. 7 , water is supplied until the water fills up to the upper end of the step of the upper frame 13 . The water filled in the hatched area b is substantially equal to the volume of the lower cell, and the water filled in the hatched area a is slightly less than or substantially equal to the volume of the upper cell. When water fills up to area a, the water supply is stopped, and the rotating shaft 21 rotates further counterclockwise in the drawing so that the lower tray 12 is completely in close contact with the upper tray 11 .

Here, the rotation guide part 133 formed on the rear side of the upper frame 13 rotates in a state in close contact with the rotation guide part 116 formed on the rear side of the upper tray 11 as shown. It rotates along the guide part 116 . In addition, the radius of curvature R of the rotation guide parts 116 and 133 is the same.

As such, when the lower tray 12 rotates in a state connected to the upper tray 11 , the interfering portion is curved to a predetermined curvature, so that the lower tray 12 is in close contact with the upper tray or separated from the upper tray 11 . when the linear motion is not required. In other words, even when the lower tray 12 is in close contact with the upper tray 11 by performing only a rotational motion, the water supplied to the lower tray 12 does not overflow to the outside.

Referring to FIG. 8 , when the lower tray 12 is rotated (eg, rotated in the first direction) and is completely in close contact with the upper tray 11 , the upper cell 113 of the upper tray 11 is moved to the upper frame. (13) is completely in close contact with the stepped portion (132). That is, the water stored in the lower tray 12 does not leak out of the spherical cell. Then, the water filled in area a of FIG. 7 is filled into the upper cell 113 of the upper tray 11 according to the rotation of the lower tray 12 . In addition, since the lower end of the upper cell 113 is completely in close contact with the communication hole 131 of the upper frame 13 , the ice formed in the adjacent cells does not stick to each other. The position of the lower tray 12 in FIG. 8 may be referred to as an ice-making position.

At this time, the lower tray 12 is in close contact with the upper tray 11 by the rotation of the rotating shaft 21 in a counterclockwise direction, and at the same time, the link connecting end 136 is also rotated and ascended. Then, the other end of the link 22 connected to the link connecting end 136 rises, and accordingly, the upper ejecting pin assembly 19 connected to one end of the link 22 also rises. In addition, the upper ejecting pin 192 also rises and is removed from the upper cell 113 of the upper tray 11 .

Referring to FIG. 9 , when ice-making is completed and the ice-moving process is started, the ice heater 18 is operated to melt the ice surface attached to the surface of the upper cell 113 by freezing inside the spherical cell. . Then, the ice is separated from the upper cell 113 . Thereafter, the rotation shaft 12 is rotated so that the lower tray 12 is rotated clockwise. Then, the ice rotates together with the lower tray 12 while being attached to the lower cell of the lower tray 12 . That is, the lower tray 12 rotates in a second direction opposite to the first direction.

And, as the lower tray 12 rotates, the link 22 is lowered, and the upper ejecting pin 192 protruding from the upper ejecting pin assembly 19 forms an air hole 115 in the upper cell. It is inserted into the upper cell 113 through the. This is to separate the ice that is attached to the upper cell 113 and is not separated.

And, when the lower tray 12 rotates to an almost vertical state, the lower ejecting pin 20 presses the bottom surface of the lower cell 141 so that the ice attached to the lower cell 141 is separated. do. When the icing is completed, the lower tray rotates in reverse again and stops in the state of FIG. 6 . At the same time, the bottom surface of the lower cell 141 returns to a hemispherical shape by its own elastic force. In the present embodiment, the rotation angle of the lower tray 12 from the ice-dividing position to the water supply position is greater than the rotation angle of the lower tray 12 from the water supply position to the ice-making position.

10 is a flowchart illustrating an ice manufacturing process of an ice maker according to an embodiment of the present invention.

Hereinafter, the water supply, ice making, and ice removal processes described with reference to FIGS. 6 to 9 will be clearly described once again.

Referring to FIG. 10 , first, the lower tray 12 rotates forward and moves to a water supply point (see FIG. 6 ) ( S10 ). In this state, water supply starts (S11), and when it is determined that the water supply is complete (S12), the lower tray is further rotated until it is in close contact with the upper tray (S13). And, in this state, an ice making process is performed (S14). During the ice making process, the cell surface of the upper tray 11 is cooled by the refrigerant flowing into the ice making pipe 30 , and freezing occurs.

Then, when it is determined that the ice making is complete (S15), the ice heater is first operated (S16) so that the ice generated inside the cell is separated from the surface of the upper cell. Then, the operation of the ice heater is stopped, and the lower tray 12 is reversely rotated to move to the ice location (S17). In the process of moving the lower tray 12 to the moving position, the lower ejection pin presses the lower bottom surface of the lower tray to cause the ice to move (S18).

As described above, although the ice maker according to the embodiment of the present invention is a pressing type ice maker, the process in which the lower tray is in close contact with the upper tray for ice making and the process in which the lower tray is separated from the upper tray for ice transfer in a state where water supply is complete In the , the lower tray performs only a rotational operation without the need for moving up and down in a straight line. Accordingly, since the linear movement process is omitted, there is an advantage that the driving mechanism can be designed simply.

Claims (14)

an upper tray including a plurality of upper cells providing an upper space forming an upper portion of the ice;
a lower tray including a plurality of lower cells providing a lower space forming a lower portion of the ice together with the upper cell, the lower tray being rotatable with respect to the upper tray;
an upper rotation shaft connection part formed at the rear of the upper tray;
a lower rotation shaft connecting portion formed at the rear of the lower tray; and
a rotary shaft rotatably coupled to the upper rotary shaft connecting portion and the lower rotary shaft connecting portion;
An ice maker having a first rotation guide curved at a first curvature at the rear of the plurality of upper cells.
According to claim 1, wherein the lower tray is
a stepped portion formed to have a predetermined height in front of the plurality of lower cells; and
The ice maker further comprising a second rotation guide formed to have a predetermined height at the rear of the plurality of lower cells.
3. The method of claim 2,
An ice maker in which a plurality of communication holes corresponding to upper surfaces of the plurality of lower cells are formed between the step portion and the second rotation guide portion.
4. The method of claim 3,
An ice maker in which the step portion and the second rotation guide portion are cut off at a portion adjacent to each of the plurality of communication holes to form a water bone portion.
3. The method of claim 2,
The ice maker is formed by bending the second rotation guide part upward.
6. The method of claim 5,
When the lower tray rotates with respect to the upper tray, the ice maker rotates while the first rotation guide part and the first rotation guide part contact each other.
6. The method of claim 5,
The curvature of the second rotation guide is the first curvature of the ice maker.
According to claim 1, wherein the lower tray is
a lower tray body in which the plurality of lower cells are arranged;
a lower frame supporting the lower tray body to be seated; and
and the lower tray includes an upper frame for fixing the lower tray body and the lower frame to a bottom surface.

The method of claim 8, wherein the lower tray is
a stepped portion extending upward from the upper surface of the upper frame and surrounding the front of the plurality of upper cells; and
and a second rotation guide extending upward from the upper surface of the upper frame and surrounding the rear of the plurality of upper cells.
10. The method of claim 9,
An ice maker in which a plurality of communication holes corresponding to upper surfaces of each of the plurality of lower cells are formed between the step portion and the second rotation guide portion.


10. The method of claim 9,
The ice maker has a curvature such that the second rotation guide is curved in an upward direction.
12. The method of claim 11,
The lower tray is an ice maker that rotates while the first and second rotation guides are in contact with each other.
12. The method of claim 11,
The curvature of the second rotation guide is the first curvature of the ice maker.
14. The method of claim 13,
The center of curvature of the first rotation guide part and the center of curvature of the second rotation guide part are the rotation shafts.

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