KR102323837B1 - Ice maker - Google Patents

Abstract

The refrigerator of this embodiment includes: an upper tray provided with an upper cell; and a lower cell forming an ice cell together with the upper cell, and a lower tray rotatable with respect to the upper tray, wherein the lower tray includes the lower cell and the lower cell in a radial direction from an upper edge of the lower cell. a tray body having an extended end and a guide wall extending upwardly from an end of the extended end; and a lower frame through which the lower cell passes and supporting the extended 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 ice-made 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 can 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 ice-made ice is stored, 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. 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. A pressing type ice maker that receives water from the lower tray and presses the upper tray has an easy water supply process. However, in order to prevent water from leaking out 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 a linear motion and a rotational motion 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. 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 the 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 part having a hole through which the lower cell passes, and the tray body seating part 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 a rotation axis without the need to linearly move the lower tray in order to make the upper tray and the lower tray in 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 a water supply state;
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 cut 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 by attaching the lower tray to 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 the 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 that corresponds 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 ice transfer, 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, when the lower ejecting pin 20 presses the bottom surface of the lower cell 141 , the spherical ice attached to the lower cell 141 is separated.

In addition, the rotation 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.

Guide sleeves 114 for forming air holes 115 protrude from upper surfaces 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 opening/closing 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 through 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, a rear portion of the edge of the upper cell 113 is formed so 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 connection 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 surface 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 upper 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 the upper surfaces of the lower cells 141 , and the 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, at the rear edge of the communication holes 131 , the rotation guide part 133 curved to a predetermined curvature unlike the front edge is formed. In other words, the stepped 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, even if the water supply speed is fast, a phenomenon in which water overflows to the outside of the tray does not occur.

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 to form a complete sphere, water is supplied from the cell corresponding to the water supply point to the adjacent cells. For this to be transferred, the water trough 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 completed 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. FIG. 6 is a side cross-sectional view of the ice maker cut along II of FIG. of the ice maker, FIG. 8 is a side cross-sectional view of the ice maker cut along II of FIG. 1 in an ice-making state, and FIG. 9 is a side cross-sectional view of the ice maker cut along II of FIG.

6 and 7 , just before water supply starts, the lower tray 12 is in a state of being 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

Therefore, as shown in the figure, the lower tray 12 is slightly tilted and water is supplied while being spaced apart from the upper tray. 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 the water fills up to area a, the water supply is stopped, and the rotation 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.

In this way, 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 it is done, 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 (for example, 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. It is completely in close contact with the stepped portion 132 of (13). That is, the water stored in the lower tray 12 does not leak out of the spherical cell. Then, 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 also rotates and rises. 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.

Then, 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-making 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 (21)

an upper tray on which a plurality of upper cells are arranged;
a lower tray in which a plurality of lower cells providing a space for forming ice together with the upper cell are arranged and rotatable with respect to the upper tray; and
and a rotation shaft that enables the lower tray to rotate with respect to the upper tray,
The lower tray may include a tray body in which the plurality of lower cells are formed;
an upper frame supporting the upper surface of the tray body from the upper side, at least a portion of which includes a stepped portion extending upwardly; and
Comprising a lower frame supporting the tray body from the lower side,
At an ice-making position in which the upper tray and the lower tray are in close contact, the stepped portion of the upper frame is disposed to surround the upper cell,
In a state in which the lower tray rotates to a water supply position, which is a position spaced apart from a portion of the upper tray for water supply, the upper end of the stepped portion defining the upper surface of the upper frame is positioned higher than the lower end of the upper cell. The method of claim 1,
In the water supply position, an upper end of the stepped portion is positioned higher than a rotation center of the rotation shaft. The method of claim 1,
The tray body may include: the lower cell;
an extension end extending in a radial direction from an upper edge of the lower cell; and
Including a guide wall extending upwardly from the end of the extension,
The step portion of the upper frame is seated on the extension end and the guide wall,
In the water supply position, a portion of the guide wall is positioned lower than a rotation center of the rotation shaft. 4. The method of claim 3,
After completion of the water supply, the upper tray of the lower tray is positioned higher than the rotation center of the rotation shaft at the ice-making position. The method of claim 1,
The upper frame is
An ice maker formed inside the stepped portion and arranged with communication holes having the same diameter as an upper surface of each of the plurality of lower cells. 6. The method of claim 5,
and wherein the communication holes are placed on upper surfaces of the lower cells, and lower surfaces of the upper cells are placed on the upper surfaces of the communication holes. 7. The method of claim 6,
The step portion of the upper frame,
a horizontal portion extending horizontally from the edges of the communication holes;
and an upper extension extending upwardly from the edge of the horizontal portion,
The communication holes are formed in the horizontal portion,
The tray body includes an extension end extending in a radial direction from the upper surface edge of the lower cell and on which the stepped portion is seated,
After completion of the water supply, the lower tray rotates and is positioned at the ice-making position where the upper tray and the lower tray are in close contact with each other,
In the ice-making position, the lower surface of the upper tray is in contact with the upper surface of the horizontal part and the upper surface of the extension end is in contact with the lower surface of the horizontal part. 8. The method of claim 7,
The upper extension portion,
a vertical extension portion positioned in a front region of the communication holes and extending vertically; and
and a rotation guide portion positioned in a rear region of the communication holes closer to the rotation axis than the front region and curved to a predetermined curvature to prevent interference between the upper tray and the lower tray. 9. The method of claim 8,
The upper tray is provided with a rotation guide portion formed in the same curvature as the rotation guide portion of the upper frame,
An ice maker in which the rotation guide portion of the upper frame is in contact with the rotation guide portion of the upper tray when the lower tray is rotated. 8. The method of claim 7,
An ice maker in which a mulgol portion formed by cutting off the stepped portion is formed in a portion where the communication holes are adjacent to each other. The method of claim 1,
An ice maker further comprising an ice heater disposed on the upper tray. The method of claim 1,
The upper tray is provided with a plurality of guide sleeves protruding from upper surfaces of the upper cells to form air holes. 13. The method of claim 12,
a water supply tray provided above the upper tray to supply ice-making water; and
and a water supply guide for guiding water supplied from the water supply tray to the lower tray through the air hole. 14. The method of claim 13,
The end of the outlet side of the water supply guide is fitted to the outer peripheral surface of any one of the plurality of guide sleeves ice maker. The method of claim 1,
an upper ejecting pin assembly for separating the ice formed in the space for forming the ice from the upper tray;
and a link having one end connected to the upper ejecting pin assembly and the other end connected to the lower tray in order to move the upper ejecting pin assembly during the rotation of the lower tray. an upper tray on which a plurality of upper cells are arranged;
a lower tray in which a plurality of lower cells providing a space for forming ice together with the upper cell are arranged and rotatable with respect to the upper tray; and
and a rotating part that enables the lower tray to rotate with respect to the upper tray,
The lower tray may include a tray body in which the plurality of lower cells are formed;
an upper frame supporting the upper surface of the tray body from the upper side and including a stepped portion at least a portion of which extends upwardly; and
Comprising a lower frame supporting the tray body from the lower side,
an ice-making position in which the upper tray and the lower tray are in close contact;
an icing position at which the step portion of the lower tray is completely spaced apart from the upper tray, so that the ice-made ice is transferred;
and a water supply position in which at least a portion of the lower tray is spaced apart from the upper cell of the upper tray between the ice-making position and the ice-making position and water is supplied to the lower tray. 17. The method of claim 16,
The ice maker according to claim 1, wherein an angle at which the lower tray rotates from the ice-removing position to the water supply position is greater than an angle at which the lower tray rotates from the water supply position to the ice-making position. 17. The method of claim 16,
In the ice-making position, the stepped portion of the upper frame is disposed to surround the upper cell,
In the water supply position, an upper end of the stepped portion defining an upper surface of the upper frame is positioned higher than a lower end of the upper cell. 17. The method of claim 16,
The tray body includes an extension end extending in a radial direction from the upper surface edge of the lower cell to seat the stepped portion of the upper frame,
The upper frame and the lower frame are supported by fixing the extension ends from the upper side and the lower side, respectively,
and a bottom of the lower cell forming a part of the space for forming the ice is exposed from the upper frame and the lower frame and is deformable. 20. The method of claim 19,
Further comprising a lower ejecting pin provided to extend in the horizontal direction under the lower tray,
and the lower ejecting pin is disposed on a rotation track of the lower tray. 21. The method of claim 20,
In the icing position, the lower tray is disposed perpendicular to the upper tray,
and the lower ejecting pin presses a portion of the bottom of the lower cell, so that the bottom of the lower cell is deformed.

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