KR20190100119A - Ice making device - Google Patents

Abstract

According to an embodiment of the present invention, an ice making device can comprise: an upper plate tray forming an upper shape; a lower plate tray forming a lower shape; a drive unit for driving of one of the upper plate tray and the lower plate tray; a cell formed as the upper plate tray and the lower plate tray are in close contact with each other by operation of the drive unit, and defined as an ice making space; a water supply unit supplying water to the cell; an ejecting unit removing ice made in the cell; and a sensor arranged at one side of at least one of the upper plate tray and the lower plate tray to sense an amount of water supplied to the cell.

Description

Ice making device {Ice making device}

The present invention relates to an ice making apparatus of a refrigerator.

Refrigerators are home appliances that store food in a refrigerated or frozen state. Recently, ice making machines are generally installed in refrigerators. In the case of the ice making apparatus, a water supply mechanism for ice making should be provided, and it is a very important control element to control precisely the amount of water for ice making. In particular, in the case of ice makers producing spherical ice, the water supply must be very precisely controlled. For example, when the water supply is insufficient, accurate spherical ice production is impossible, and when the water supply is exceeded, a problem occurs that the ice tray is destroyed due to volume expansion during the ice making process.

1 is a view schematically showing a water supply system for a conventional refrigerator ice making.

Referring to FIG. 1, a water supply passage is connected to a water supply source 1, and an on / off valve 2 is mounted on the water supply passage. In addition, a flow rate sensor 3 is mounted at the outlet side of the open / close valve 2, and an end of the water supply passage is connected to a water supply port of the ice maker 5. The flow sensor 3 and the valve 2 are connected to the microcomputer 4 so as to be electrically controlled.

The flow sensor 3 is generally used with a flowmeter and is calculated on the water supply flow rate according to the number of pulses corresponding to the rotational speed of the flowmeter. When the water supply is completed, a valve locking signal is output from the microcomputer 4 to close the valve 2.

As another method of the existing ice maker water supply method, a water supply method for a time set in advance by the microcomputer 4 is used. For example, if the water supply time is set to 5 seconds, the water is supplied unconditionally for 5 seconds regardless of the water pressure of the water supply source.

The conventional water supply control method as described above has the following problems.

First, in the case of time control, there is no method to consider the water supply variation according to the pressure, there is a problem that the actual flow rate supplied from the ice making tray has a large difference depending on the pressure.

Second, in the case of the flow sensor control, when the flow sensor is used in a region where the water pressure is low, the water is supercharged than the target water supply. The reason is that the water pressure is low, so that water passing around the impeller is not generated while the impeller of the flow sensor is turned, and the supply flow rate becomes larger than the detected pulse value.

2 is a graph showing the supercharged water phenomenon that occurs when water supply control using a flow sensor in a low water pressure region.

As shown, it can be seen that a phenomenon in which more water is supplied than the target water supply amount A occurs in the low water pressure region.

An object of the present invention is to provide a refrigerator capable of controlling the correct amount of water supply.

In particular, it is an object of the present invention to provide a refrigerator capable of quantitative water supply, regardless of the water pressure in the refrigerator installation region, for an ice making apparatus provided with a closed tray for upper and lower plates for ice making spherical ice.

Ice making apparatus according to an embodiment of the present invention for achieving the above object, the upper plate forming a top shape; A lower tray forming a lower shape; A driving unit for driving any one of the upper tray and the lower tray; A cell defined by the upper tray and the lower tray in close contact with each other by an operation of the driving unit, and defined as an ice making space; A water supply unit supplying water to the cell; An ejecting unit for ejecting the ice iced in the cell; It may include a sensor disposed on at least one side of the upper tray and the lower tray, for detecting the amount of water supplied to the cell.

The lower tray may include a tray case forming an outer shape, a tray body mounted on the tray case and having a plurality of hemispherical recesses forming a lower half of a spherical ice, and fixing the tray body to the tray case. It may include a tray cover.

According to the refrigerator according to the embodiment of the present invention constituting the above configuration, there is an advantage that accurate water supply control for deicing even in a low water pressure region.

In particular, there is a very advantageous effect in ice making systems that require accurate water supply control, such as ice makers for making spherical ice.

1 is a view schematically showing a water supply system for a conventional refrigerator ice making.
Figure 2 is a graph showing the supercharged water phenomenon when the water supply control using the flow sensor in the low water pressure area.
3 is an exploded perspective view schematically showing an ice making apparatus to which a water supply system according to an exemplary embodiment of the present invention is applied.
Figure 4 is a side cross-sectional view showing a water supply of the ice making device.
5 is a system diagram schematically showing a water supply mechanism for ice making of a refrigerator according to an embodiment of the present invention;
6 is a longitudinal sectional view taken along II of FIG. 5;
Figure 7 is a longitudinal sectional view of the quantitative water supply module according to another embodiment of the present invention.
8 is a sectional view showing a water supply system according to another embodiment of the present invention.
9 is a sectional view showing a water supply system according to another embodiment of the present invention.
10 and 11 are side views showing an ice making apparatus having a water supply structure according to another embodiment of the present invention.
12 is a system diagram schematically showing an ice making water supply mechanism according to another embodiment of the present invention.

Hereinafter, a water supply system for deicing a refrigerator according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is an exploded perspective view schematically illustrating an ice making apparatus to which a water supply system according to an exemplary embodiment of the present invention is applied, and FIG. 4 is a side cross-sectional view illustrating a water supply of the ice making apparatus.

The control method according to the embodiment of the present invention has an advantageous advantage when applied to the ice making device for producing the spherical ice, hereinafter, the ice making device for producing the spherical ice will be described as an embodiment.

Referring to FIG. 3, the ice making apparatus 100 according to an exemplary embodiment of the present invention includes an upper plate tray 110 forming an upper shape as a whole, a lower plate tray 120 forming a lower shape, and the upper plate tray 110. And a driving unit 140 for driving any one of the lower trays 120 and an ejecting unit 160 for icing ice iced from the upper trays 110 or the lower trays 120.

In detail, the hemispherical recess 125 forming the lower half of the spherical ice is arranged inside the lower tray 120. The lower tray 120 may be formed of a metal material, and at least a part of the lower tray 120 may be formed of a material that is elastically deformable. In this embodiment, a part of the lower tray 120 will be described with an example of an elastic material.

The lower tray 120 may include a tray case 121 forming an outer shape, a tray body 123 attached to the tray case 121, and having the depression 125, and the tray body 123. It includes a tray cover 126 for fixing the tray case 121.

The tray case 121 is formed in a rectangular frame shape and is further extended upward and downward along an edge. In addition, a seating portion 121a through which the recessed portion 125 passes is formed inside the tray case 121. The lower tray connection part 122 is formed at the rear of the tray case 121. The lower tray connection portion 122 is coupled to the upper tray 110 and the driving unit 140, and becomes a rotation center of the tray case 121. In addition, an elastic member mounting portion 121b is provided at one side of the tray case 121, and the elastic member mounting portion 121b has an elastic member for providing an elastic force to maintain the closed state of the lower plate tray 120 ( 131 is connected.

The tray body 123 is formed of a flexible material that is elastically deformable, and is formed to be seated above the tray case 121. The tray body 123 may include a planar portion 124 and the recessed portion 125 recessed in the planar portion 124. In addition, the recess 125 may protrude downward through the seating portion 121a of the tray case 121. Therefore, the depression 125 is pressed by the ejecting unit 160 when the lower tray 120 is rotated, and is configured to allow ice inside the depression 125 to be moved to the outside.

The tray cover 126 is provided above the tray body 123, and is configured to allow the tray body 123 to be fixed to the tray case 121. In addition, the tray cover 126 is provided with a perforated portion 126a corresponding to the shape of the opened upper surface of the recessed portion 125 formed in the tray body 123. The perforated portion 126a is formed in a shape in which a plurality of circles overlap each other in succession. Therefore, when the assembly of the lower plate tray 120 is completed, the recess 125 is exposed through the perforation 126a.

On the other hand, the upper tray 110 forms an upper shape of the ice making apparatus 100, and includes a mounting portion 111 for mounting the ice making apparatus 100 and a tray portion 112 for forming ice. do.

In detail, the mounting portion 111 is to be fixed to the inside of the freezing compartment or the ice making chamber 100, it is formed extending in the direction orthogonal to the tray 112. Accordingly, the mounting portion 111 may be stably fixed by surface contact with the side portion of the freezing compartment or the ice making chamber. In addition, the tray part 112 may be formed in a shape corresponding to the shape of the lower plate tray 120, and the tray part 112 may be formed in a hemispherical shape, and the plurality of recessed parts 113 may be recessed upward. ) May be formed. The depressions 113 are arranged in series in a plurality. In addition, when the upper tray 110 and the lower tray 120 are closed, the recess 125 of the lower tray 120 and the recess 113 of the upper tray 110 are joined to each other to form a spherical ice making space. Phosphor cell 150 is formed. The upper tray 110 recessed portion 113 may have a hemispherical shape corresponding to that of the lower tray 120.

The upper tray 110 may be formed of a metal material as a whole, and may be configured to freeze water in the cell 150 at high speed by thermal conduction. In addition, the upper tray 110 may be further provided with a heater 161 for heating the upper tray 110 for ice ice. In addition, a water supply unit 170 for supplying water to the water supply unit 114 of the upper tray 110 is further provided above the upper tray 110.

The upper tray 110 may be configured such that the recess 113 of the upper tray 110 is formed of an elastic material, such as the lower tray 120, so that the upper tray 110 may be easily moved.

In addition, the rotating arm 130 and the elastic member 131 are provided on the side of the lower tray 120. The rotating arm 130 is for tensioning the elastic member 131 and may be rotatably mounted to the lower tray 120.

One end of the rotating arm 130 may be axially coupled to the lower plate tray connecting portion 122, and may be configured to further rotate even when the lower plate tray 120 is closed to tension the elastic member 131. . In addition, an elastic member 131 is mounted between the rotating arm 130 and the elastic member mounting portion 121b. The elastic member 131 may be composed of a tension spring. Therefore, in the state in which the lower tray 120 is closed, the rotating arm 130 is further rotated in the direction in which the lower tray 120 is in close contact with the upper tray 110 so that the elastic member 131 is tensioned. do. In addition, the lower plate tray 120 is in close contact with the upper plate tray 110 by the elastic force of the elastic member 131, thereby preventing leakage during ice making.

In addition, a plurality of air holes 115 are formed on an upper surface of the recess 113 of the upper tray 110. The air hole 115 allows air to be discharged when water is supplied into the cell 150. In addition, the air hole 115 may be formed in the shape of a cylindrical sleeve extending upward, to guide the entry and exit of the ejecting pin 162 for ice ice.

On the other hand, the water supply unit 114 is formed in the cell 150 located approximately in the center of the plurality of cells 150. The water supply unit 114 may be formed to have a larger diameter than the air hole 115 for smooth water supply. The water supply unit 114 may be located at any one end of the left and right both ends of the plurality of cells 150 for the convenience of water supply. The water supply unit 114 may be configured to guide the entry and exit of the ejecting pin 162 for the air discharge and the ebbing during water supply in addition to the function of water supply.

On the other hand, as shown in Figure 4, the upper tray 110 and the lower tray 120 is in close contact with each other so that the stored water does not leak, the inner surface is to form a spherical ice can be molded. Here, the amount of water supplied to the cell 150 determines whether complete spherical ice is produced. For example, when the water supplied to the cell 150 is below the set flow rate, the top surface of the completed ice may be flattened. On the contrary, when the supplied water exceeds the set flow rate, the upper tray 110 and the lower tray 120 may be opened or damaged by volume expansion during ice formation. Therefore, in the ice making apparatus for producing spherical ice, it is very important to control the water supply precisely.

FIG. 5 is a system diagram schematically showing an ice making water supply mechanism of a refrigerator according to an embodiment of the present invention, and FIG. 6 is a longitudinal cross-sectional view cut along the line I-I of FIG. 5.

5 and 6, an ice making water supply system according to an embodiment of the present invention includes a water supply source 6, a quantitative water supply module 30 connected to the water supply source 6, and the quantitative water supply module. And an ice maker 100 connected to the outlet side of the 30.

In detail, an inlet valve 8 is mounted between the water supply source 6 and the fixed water supply module 30, and an outlet valve 9 is provided between the ice maker 100 and the fixed water supply module 30. The water supply to the fixed quantity water supply module 30 and the water supply to the ice maker 100 are controlled. In addition, the inlet valve 8 and the outlet valve 9 are connected to the control unit 7 to control the opening and closing.

In addition, the fixed quantity water supply module 30 includes a water tank 31 for storing the water supplied from the water supply source 6 and a flow rate sensor for detecting the amount of water supplied into the water tank 31. The flow sensor includes a capacitive sensor 32. In addition, the capacitive sensor 32 is connected to the control unit 7, and a signal reaching the set level is transmitted to the control unit 7.

The quantitative water supply module 30 will be described in more detail.

The water tank 31 constituting the quantitative water supply module 30 includes a case 311 forming a space for storing water therein, and an inlet 312 formed at one side of an upper surface of the case 311. And a water extraction part 313 formed on the bottom surface, a sensing unit 315 protruding from the other side of the upper surface of the case 311, and a capacitive sensor 32 mounted on the sensing unit 315.

In detail, the bottom portion of the case 311 forms an inclined surface 314 to collect water toward the water outlet 313. That is, the inlet is made inclined downward toward the water outlet 313. This is to prevent residual water from occurring in the water tank 311 during the water extraction process of supplying water to the ice maker 100.

In addition, the electrode 312 of the capacitive sensor 32 extends into the sensing unit 315. When the set amount is supplied to the water tank 31, the water level is filled to the height at which the end of the electrode 312 is located. When water comes into contact with the electrode 312, the resistance value detected by the capacitance sensor 32 is changed by the difference between the capacitance of air and water, and the electric signal according to the change of the resistance value is controlled by the controller 7. It is sent to to detect that the set quantity has been reached. The horizontal cross-sectional area of the sensing unit 315 is smaller than the horizontal cross-sectional area of the water tank 311, in order to minimize the flow error due to the water level error.

In addition, the water inlet 312 has a tubular shape extending upward from the upper surface of the water tank 311, so that the water supply direction, that is, the flow direction is the gravity direction. This is to minimize the water level misdetection of the electrode 312 by minimizing the flow in the tank generated during water supply.

In addition, the air hole 316 is formed on the upper end of the sensing unit 315, so that the inside of the water tank 311 is always maintained at atmospheric pressure during the water supply and withdrawal process.

On the other hand, when it is determined that the set quantity supply is completed by the capacitive sensor 32, the control unit 7 closes the inlet side valve 8 and opens the outlet side valve 9. Then, the water supplied and stored to the water tank 311 is supplied to the ice maker 100.

7 is a longitudinal sectional view of the quantitative water supply module according to another embodiment of the present invention.

Referring to FIG. 7, the quantitative water supply module 40 according to the present embodiment is the same in configuration as the quantitative water supply module 30 of the previous embodiment, but there is a difference only in the water level sensor mounted to the sensing unit 415. have.

Since the configuration of the case 411, the water inlet 412, the water outlet 413, the inclined surface 414, the sensing unit 415, and the air hole 416 is the same as in the previous embodiment, redundant description thereof will be omitted.

In the present embodiment, a floating sensor 42 is applied as a sensor mounted inside the sensing unit 415.

In detail, the floating sensor 42 may include a buoy 421 moving up and down according to the water level in the sensing unit 415, a magnet 424 mounted in the buoy 421, and It is mounted on one side of the inner peripheral surface of the sensing unit 415 includes a Hall sensor 423 for detecting the magnetic force generated from the magnet 424.

The buoy 421 rises as the water level increases from the time when water is supplied into the water tank 411 and the water level reaches the lower end of the sensing unit 415. When the magnet 424 inside the buoy 421 is located at the height of the hall sensor 423, the hall sensor 423 detects this and sends a signal to the controller 7. Then, the controller 7 closes the inlet valve 8 and opens the outlet valve 9 so that the water supplied into the water tank 411 is supplied to the ice maker 100.

8 is a cross-sectional view showing a water supply system according to another embodiment of the present invention.

Referring to FIG. 8, the capacitive sensor 32a is mounted on the upper tray 110 of the ice making apparatus 100 for manufacturing spherical ice.

In detail, the capacitive sensor 32a is mounted near the upper end of the upper tray 110. Here, since water existing in the water pipe may be continuously supplied to the ice making apparatus 100 even after the water supply is stopped, it is preferable to set the position of the capacitive sensor 32a in consideration of this. If the capacitive sensor 32a is mounted on the uppermost end of the upper tray 110, the supplied water may flow out of the ice making apparatus 100 beyond the set flow rate, or the tray may be damaged during the ice making process. Symptoms may occur. Therefore, in consideration of the amount of water continuously supplied after the water supply is interrupted, it is preferable to mount the capacitive sensor 32a at a point slightly below the top of the upper tray 110.

In addition, the capacitive sensor 32a may be mounted on the uppermost tray corresponding to the outermost side from the water supply unit 170 so that the water supply is stopped after the water supply is completed in the entire water supply tray.

9 is a cross-sectional view showing a water supply system according to another embodiment of the present invention.

9, the present embodiment is characterized in that the floating sensor according to the embodiment shown in FIG. 7 is directly mounted on the side of the upper tray 110 of the ice making apparatus 100 for producing spherical ice.

In detail, a flow sensing (or level sensing) module including the sensing unit 415 and the floating sensor 42 provided inside the sensing unit 415 is formed at any point of the upper tray 110. It is characterized by being in communication with each other by the hole (110a). In more detail, when water is supplied into a cell formed between the upper tray 110 and the lower tray 120, and the water level reaches the communication hole 110a, the water supplied into the cell is detected by the sensing unit. 415 flows into the interior. Then, the water level inside the cell and the water level inside the sensing unit 415 are raised while being kept the same. Then, when the magnet 422 rises to the position of the hall sensor 423, the water supply is stopped.

10 and 11 are side views showing an ice making apparatus having a water supply structure according to another embodiment of the present invention.

10 and 11, a hall sensor 50 is mounted on an outer side surface of the lower tray 120 of the ice making apparatus 100, and a magnet (not shown) on a side of a case in which the ice making apparatus 100 is accommodated. Is fitted. Then, the lower tray 120 according to the water supply to detect the degree of rotation to the bottom characterized in that it detects whether the water supply.

As shown in FIG. 10, the upper plate tray 110 and the lower plate tray 120 remain in close contact with each other until water supply is started. Then, when water is supplied to the lower tray 120 through the water supply unit 170, as shown in Figure 11, the lower tray 120 is driven by the load of the supplied water of the drive unit 140 It rotates downward about the axis. Then, when the set flow rate is supplied, the rotation of the lower tray 120 immediately stops before reaching the set flow rate, and at this moment, the hall sensor 50 detects the magnet to generate a water supply stop signal. Done. The magnet is mounted at a point at which the hall sensor 50 is positioned when the lower tray 120 is rotated to the maximum. The magnet may be mounted at a point separate from the ice making apparatus 100, and the separate component may be an ice making room sidewall that accommodates the ice making apparatus 100.

Here, the time when the hall sensor 50 detects the magnet is set just before reaching the set flow rate, as described above, that is, even after the water supply is stopped, the water supply unit 170 Since the water remaining in the connected water supply pipe or member can be supplied to the lower tray 120, this residual flow rate is considered.

On the other hand, the Hall sensor 50 and the magnet may be mounted opposite to each other. That is, the magnet may be mounted on the lower tray 120, and the hall sensor 50 may be mounted on an ice making chamber sidewall at a position facing the magnet.

12 is a system diagram schematically showing an ice making water supply mechanism according to another embodiment of the present invention.

Referring to FIG. 12, as a configuration for quantitative water supply, the water supply source 6, the inlet valve 8, the quantitative water supply module and the outlet valve 9 are the same as in the previous embodiments.

However, the quantitative water supply module is different from the previous embodiment in that the water tank 61 and the load cell 60 for sensing the flow rate supplied to the water tank 61. In detail, the load cell 60 for sensing the weight of the water supplied to the water tank 61 is mounted on the top or bottom of the water tank 61. Then, when water supply is started to the water supply tank 61, the load cell 60 detects the weight of the water supplied to detect the correct water flow rate.

In detail, the control unit 7 initializes the load cell 60 before the water supply starts. When the water supply starts, the weight of the water supplied from the load cell 60 is measured. When the set weight value is reached, it is determined that the quantitative water supply is completed, and the load cell 60 transmits a water supply stop signal to the controller 7. Then, the lower tray 120 is rotated upward to be in close contact with the upper tray 110. Thereafter, an ice making process and an ice making process are performed.

Meanwhile, in addition to being mounted on the water tank 61, the load cell 60 may be mounted directly on the lower tray 120.

The quantitative water supply means presented above is mounted on a spherical ice making machine for which the amount of water to be supplied must be precisely controlled, whereby ice close to a perfect sphere shape can be easily produced.

Claims (22)

An upper plate tray forming an upper shape;
A lower tray forming a lower shape;
A driving unit for driving any one of the upper tray and the lower tray;
A cell defined by the upper tray and the lower tray in close contact with each other by an operation of the driving unit, and defined as an ice making space;
A water supply unit supplying water to the cell;
An ejecting unit for ejecting the ice iced in the cell;
A sensor disposed on at least one side of the upper tray and the lower tray to detect an amount of water supplied to the cell;
The lower tray,
Tray case forming the appearance,
A tray body mounted to the tray case and arranged with a plurality of hemispherical recesses forming a lower half of a spherical ice;
And a tray cover for fixing the tray body to the tray case. The method of claim 1,
The sensor,
An ice making device comprising at least one of a capacitive sensor, a floating sensor, a hall sensor, and a load cell. The method of claim 1,
The capacitive sensor is an ice making device, characterized in that formed at a point spaced apart from the upper end of the upper tray to the lower side. The method of claim 1,
The lower tray,
An ice making apparatus comprising a metal material or at least a portion of the material which is elastically deformable. The method of claim 1,
When the assembly of the lower tray is completed, the plurality of depressions are exposed through the perforations formed in the tray cover. The method of claim 1,
And when the lower tray is rotated in a direction away from the upper tray by the driving unit, the recess is pressed by the ejecting unit so that ice formed in the recess is iced outward. The method of claim 1,
Ice making apparatus further comprises a rotating arm provided on the side of the lower tray. The method of claim 7, wherein
It is provided on the side of the lower tray, the ice making apparatus further comprises an elastic member having one end connected to the rotating arm. The method of claim 8,
One side of the lower tray is provided with an elastic member mounting portion,
Ice making apparatus, characterized in that the other end of the elastic member is connected to the elastic member mounting portion. The method of claim 9,
The rotating arm is rotatably mounted to the lower plate tray to tension the elastic member,
And the elastic member provides an elastic force to keep the lower tray closed. The method of claim 9,
And the rotating arm is configured to further rotate to tension the elastic member even when the lower plate tray is closed. The method of claim 1,
The tray case is formed in a rectangular frame shape, ice making apparatus characterized in that it is formed to extend further upward and downward along the rim. The method of claim 1,
A seating portion is formed inside the tray case,
And the plurality of recesses protrude downward from the tray case through the seating portion. The method of claim 1,
An ice making apparatus, characterized in that the lower tray connection is formed at the edge of the tray case. The method of claim 14,
The lower tray connection portion, the ice making apparatus, characterized in that coupled to the upper tray and the drive unit. The method of claim 13,
The lower tray connection portion, the ice making apparatus, characterized in that the center of rotation of the tray case. The method of claim 1,
The tray body is an ice making apparatus, characterized in that formed of a flexible material capable of elastic deformation. The method of claim 1,
And the tray body is formed to be seated above the tray case. The method of claim 1,
The tray body further includes a flat portion,
And the plurality of recesses are recessed a predetermined depth downward from the planar portion. The method of claim 1,
And the tray cover is provided above the tray body. An upper plate tray forming an upper shape;
A lower tray forming a lower shape;
A driving unit for driving any one of the upper tray and the lower tray;
A cell defined by the upper tray and the lower tray in close contact with each other by an operation of the driving unit, and defined as an ice making space;
A water supply unit supplying water to the cell;
An ejecting unit for ejecting the ice iced in the cell;
A sensor disposed on at least one side of the upper tray and the lower tray to detect an amount of water supplied to the cell;
The lower tray,
Tray case forming the appearance,
A tray body mounted to the tray case and arranged with a plurality of hemispherical recesses forming a lower half of a spherical ice;
A tray cover for fixing the tray body to the tray case;
The lower tray,
Ice making apparatus, characterized in that formed of a metallic material, or at least a portion of the elastically deformable material. An upper plate tray forming an upper shape;
A lower tray forming a lower shape;
A driving unit for driving any one of the upper tray and the lower tray;
A cell defined by the upper tray and the lower tray in close contact with each other by an operation of the driving unit, and defined as an ice making space;
A water supply unit supplying water to the cell;
An ejecting unit for ejecting the ice iced in the cell;
A sensor disposed on at least one side of the upper tray and the lower tray to detect an amount of water supplied to the cell;
The lower tray,
Tray case forming the appearance,
A tray body mounted to the tray case and arranged with a plurality of hemispherical recesses forming a lower half of a spherical ice;
A tray cover for fixing the tray body to the tray case;
The tray cover is provided with a perforation portion corresponding to the edge shape of the opened upper surface of the plurality of depressions.

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