JP2004245484A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerator requiring no mechanism for removing cloudy ice and inexpensively producing highly transparent ice with less components. <P>SOLUTION: The refrigerator is provided with an ice making device having separate shapes provided in block shapes of an ice tray for vertically separating ice blocks while leaving connections, in which the cloudy portion is moved to the lower part of the ice tray with downward cooling applied from an upper part to produce transparent ice at the upper part, the connections are cut off in an ice separating process after completing ice making to separate the transparent ice, remaining cloudy ice is melted by water newly supplied to the ice tray and mixed, and then ice is made again. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
According to the present invention, when ice is generated in an ice making device, the cloudy portion of the ice due to the gas component or the ionic component in the supplied water is partially concentrated to make the other transparent and separate each other. The present invention relates to a refrigerator provided with an ice making device for obtaining ice with high transparency.
[0002]
[Prior art]
When ice is generated in a conventional refrigerator, the gas component contained in the supplied water freezes from a low temperature around the water during the ice making process. When frozen from the outer shell, it was chased by the unfrozen portion in the center and was confined within the ice grains to form a cloudy part, resulting in ice grains with low transparency.
[0003]
As a means for realizing highly transparent ice, an automatic ice maker such as a refrigerator is provided with an ice tray having an open bottom surface that is superimposed on an inner surface of a water storage tank with a drain port provided on one side of a cooler, A drive device for reversing the rotation is provided, and the water storage tank and the drain port are surrounded by a heat insulating material, and a heater is provided in close contact with the outer wall thereof, and the drain port is connected to a drain device and a drain pipe. In addition, there is a configuration in which a detachable water supply tank and a water supply pump are separately provided to guide a water supply pipe to a water storage tank.
[0004]
With such a configuration, when a predetermined amount of water filled in the water supply tank is supplied to the water storage tank through the water supply pipe by the water supply pump, the ice tray superposed on the inner surface of the water storage tank has an opening at the bottom. The water is flooded to a predetermined water level via the. The outer periphery of the water storage tank is surrounded by a heat insulating material, and is kept warm by a heater, so that the cold air in the cooling chamber performs a one-way freezing operation from the surface of the water downward so that gas components and impurities in the water are removed from the lower water. Ice crystals are generated while discharging to the surface. Next, when the drainage device is activated when the ice reaches the appropriate thickness, the unfrozen water with high concentration of gaseous components and impurities is drained through the drainage device and drainage pipe, and the ice tray has high transparency and purity. Ice is left. The overlapping portion of the water storage tank and the ice tray is prevented from freezing by the heating action of the heater, and the ice tray is separated from the water storage tank by the rotating action of the driving device, and the ice tray is inverted and ice is removed (for example, Patent Document 1).
[0005]
[Patent Document 1]
Japanese Patent Publication No. Hei 7-18627
[Problems to be solved by the invention]
In the case of a conventional automatic ice making device such as a refrigerator, the heater as a component requires a large heater capacity to keep the water in the reservoir at all times, and is expensive and consumes power due to the temperature influence on the surroundings. There was also concern about the deterioration of air conditioners and the adverse effect of cooling other rooms.
[0007]
Further, after draining, a step of drying wet ice particles in the ice tray is required, and the ice making time is lengthened.
[0008]
In addition, the construction of a water storage tank, a drain port, a drain valve, and the like are required, and the system for obtaining transparent ice is considerably large and not only expensive, but also a motor driving noise represented by an actuator or the like. There are also problems in terms of quality such as reliability such as operation noises such as flowing sound of water and malfunction due to foreign matter entering the drain valve.
[0009]
In addition, the production of transparent ice requires a water volume several times larger than the size of ice particles, and there is also a problem in terms of economics such as water supply.
[0010]
The present invention has been made in order to solve the above-described problems, and has as its object to provide a refrigerator that does not require a mechanism for removing cloudy ice and that can generate highly transparent ice at low cost with a small number of components. And
[0011]
[Means for Solving the Problems]
The refrigerator according to the present invention is provided with a separate shape for dividing ice particles into upper and lower portions while leaving a connecting portion in each grain shape of the ice tray, and moving the cloudy portion to the lower portion of the ice tray by cooling from above. After clear ice is generated, the connection is cut in the ice release process after ice making is completed, the clear ice is released, the remaining cloudy ice is thawed with the water supplied to the new ice tray, mixed, and then mixed again. An ice-making device for making ice is provided.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
1 to 3 show a first embodiment, in which a configuration of a refrigerator is illustrated, FIG. 2 is an illustration of an ice making system, and FIG. 3 is an explanatory view of an ice tray structure.
In FIG. 1, the refrigerator main body 1 has a refrigerating compartment 100 arranged with an opening / closing door at the top, and switches from a freezing temperature zone (−18 ° C.) below the refrigerating compartment 100 to a refrigerating, vegetable, chilled temperature zone. Switching room 400 having a drawer door capable of operating the same, an ice making room 500 having a drawer door in parallel with the switching room 400, a freezing room 200 having a drawer door arranged at the bottom, a freezing room 200 and a switching room 400 And an ice making room 500, and a vegetable room 300 provided with a drawer door.
[0013]
The cool air cooled by the cooler 3 is circulated to the refrigerator body 1 by the fan 2.
The cooled cold air is blown by the cool air blowing ducts 4 provided in the refrigerator compartment 100, the switching compartment 400, the ice making compartment 500, and the freezing compartment 200, respectively, to cool each compartment, and then returns to the return duct 5 from each compartment. It returns to the cooler 3 again and exchanges heat again to circulate cool air. Further, in the vegetable room 300, radiation cooling is performed by returning cold air from the refrigerator room 100. The temperature of each room is controlled by controlling the air volume regulator 7 installed in each cool air blow duct 4 by the temperature sensor 6 installed in each room.
[0014]
Here, as an example, the layout in which the ice making room 500 is arranged in parallel with the switching room 400 between the refrigerator room 100 and the vegetable room 300 is shown, but the configuration is not limited to this. For example, the ice making room 500 may be arranged in parallel with the switching room 400 between the vegetable room 300 and the freezing room 200, or the ice making room 500 may be a part of the freezing room 200.
Other components in FIG. 1 will be described later.
[0015]
As shown in FIG. 2, water is pumped up from a water supply tank 8 installed in the refrigeration room 100 by a water supply pump 9 in the water supply tank 8, and inside a water supply pipe 10 that connects the refrigeration room 100 and the ice making room 500. The water is supplied to the ice tray 11 that produces ice via the.
The cool air that has passed through the cool air blowing duct 4 for the ice making chamber 500 is supplied into a frame 13 that fixes the ice tray 11 and an ice making driving device 12 that twists the ice tray 11, and performs ice making.
[0016]
When the ice making thermistor 14 fixed to the lower portion of the ice making tray 11 becomes lower than a certain set temperature, the ice making is judged to be completed, and the ice detecting lever 15 incorporated in the ice making driving device 12 for detecting the amount of ice storage is determined. The ice storage amount is detected by operating the ice tray, and if the full ice amount set at a position lower than the rotation trajectory of the ice tray 11 has not been reached, the ice making drive device 12 starts rotating to rotate the ice tray 11. The ice is separated from the ice tray 11 by twisting.
[0017]
An example of the ice tray structure of the present invention will be described with reference to FIG. Since the ice formation mechanism freezes from the low temperature part around the water, the gas component causing white turbidity is chased by the unfrozen part in the center when the water freezes from the outer shell, and it becomes cloudy . In the transparent ice making system of the present invention, the white turbid portion is driven downward by applying cooling from the opening of the ice tray 11, that is, from above, and the separation of the white turbid portion and the transparent portion in the ice is promoted.
[0018]
In order to perform cooling from above, the amount of cool air is increased by increasing the ratio of the opening area of the cold air blow ducts above and below the ice tray 11 to the ratio above the ice tray 11 or by controlling the rotation speed of the fan 2 for blowing cool air. For example, there is a means for changing the wind direction by adjusting the opening angle of the air volume regulator 7 or the like.
[0019]
Then, a cloudy portion and a transparent portion of ice are separated by a separator shape 16 provided in the ice tray 11. An opening for connecting the transparent ice part 17 and the cloudy ice part 18 is formed in the separator shape 16, and it is preferable to provide at least two or more hole shapes 19 having a diameter of about 2 to 5 mm, for example. However, the hole shape 19 may be at one place.
[0020]
If the hole shape 19 is smaller than 2 mm in diameter, it is difficult for water to flow between the upper and lower layers of water. If the hole shape 19 is larger than 5 mm, the connection of ice between the upper and lower layers becomes strong and the ice tray 11 is transparent even if the ice tray 11 is twisted. The diameter is preferably 2 to 5 mm because the part and the cloudy part will not separate.
[0021]
However, the opening of the separator shape 16 does not necessarily have to have a round hole shape as long as water can flow between the upper and lower layers and the ice of the upper and lower layers can be divided at the time of ice removal.
[0022]
In addition, as for the arrangement of the hole shapes 19, when a plurality of holes are symmetrically arranged at the same pitch as much as possible, ice is easily released even when water is flowing or the dish is twisted.
[0023]
The separator shape 16 may be any size as long as its depth from the bottom of the ice tray 11 secures a capacity of 5 to 30% of the volume of ice particles. In terms of dimensions, for example, it is 2 to 10 mm. When the volume exceeds about 30% of the volume of the ice particles, the size of the ice tray 11 is increased when the required size of the transparent portion is secured.
[0024]
Then, only the highly transparent ice completed on the upper part of the separator shape 16 is de-iced, and then the cloudy ice on the lower surface is melted by newly supplied water through the hole shape 19 in the separator shape 16 to remove the ice in the ice. Degas the air component to produce clear ice again. This makes it possible to produce inexpensive transparent ice without a drainage mechanism.
[0025]
Embodiment 2 FIG.
4 and 5 are views showing Embodiment 2, FIG. 4 is a view showing a method of forming an ice tray integrated with a separator by a gas injection method, and FIG. 5 is a view showing a method of forming an ice tray by a die slide method. It is.
Normally, when water is changed from water to ice, volume expansion occurs. In addition to this, when the upper and lower two layers are composed of two parts, a phenomenon occurs in which the upper part and the lower part further separate due to a twisting operation or the like. Thus, by integrating the upper and lower two layers of ice tray 11, floating and displacement between the above-mentioned two parts can be prevented, and at the same time, the transmission of the torsional torque at the time of ice removal can be improved, and the ice separating property can be improved.
[0026]
As shown in FIG. 4, as a method of forming an ice tray integrated with a separator, a resin is filled in an ice tray shape of a mold, and then a semi-enclosed space below the ice tray is supplied through a gas sealing nozzle provided in each particle shape. There is a gas injection method in which a hollow shape is formed by injecting a gas into a gas.
[0027]
Also, as shown in FIG. 5, the unmoldable shape due to the undercut is divided into a plurality of parts, and the plurality of parts are simultaneously filled with resin by primary molding, and then the mold on the movable side in the same mold is removed. After sliding and combining the shapes of the plurality of parts, a die-sliding method is used in which secondary molding is performed on the joint portion to connect the parts. In this method, a polypropylene-based resin is preferable in consideration of the twisting property of the ice tray and the joining strength by molding.
[0028]
Although a method of insert-molding only the separator shape 16 may be used, it is slightly disadvantageous in the ice tray 11 in which a large stress is applied because the strength against torsion and the like is slightly weaker than the above-described integral molding.
[0029]
According to the above-described embodiment, the two-layer structure of the ice tray 11 is integrally formed, so that the floating or displacement of the parts generated when the two parts are formed can be prevented, and the transmission of the torsional torque at the time of ice separation is improved. Transparent ice formation with good icy properties can be realized.
[0030]
Embodiment 3 FIG.
FIG. 6 is a view showing the third embodiment, and is a view showing a configuration of an ice tray. In the first embodiment, the method of cooling with a fan or the like from above the ice tray is described, but here, a small amount of heat is applied from below the ice tray by a heating element such as a heater. As a result, the temperature difference between the upper and lower portions of the ice tray becomes clearer, and the cloudy portion can be efficiently driven downward.
[0031]
In the heater, which is a heating element, heat can be efficiently applied if the heater is fixed to the bottom of the ice tray or the lower part of the side surface. At that time, it is preferable that the heater wire be flexible so as to withstand the twisting operation of the ice tray. For example, a structure in which a nichrome wire is wound around a core wire and covered with an insulating coating may be used. The insulating coating may be made of vinyl chloride, fluorine resin, silicon resin or the like as long as heat resistance can be ensured and relatively soft. For example, if a cord heater coated with PVC is covered with aluminum foil, it can be twisted without any problem when twisting an ice tray. Further, the shape of the heater is not limited to the cord shape, but may be, for example, a sheet shape in which a heating wire is embedded.
[0032]
In addition, a small heating element having a resistor embedded therein may be installed under each ice particle shape of the ice tray, even if it is not a flexible heating element. As a method of attaching the heating element, the heating element may be attached to an ice tray with an aluminum tape or the like with an adhesive. At this time, the heater may be fixed to the ice tray using a fall prevention cover for preventing peeling or the like. Further, when the insulation distance from the heating element is insufficient, the insulation distance may be maintained by interposing a cover or an insulator.
[0033]
Embodiment 4 FIG.
7 and 8 show the fourth embodiment. FIG. 7 is a diagram showing control of a heating element, and FIG. 8 is a flowchart showing a method of cleaning an ice tray.
In the heating element described in the third embodiment, continuous energization may be performed, but by controlling the heating element, the ice-making ability can be further improved. For example, as shown in FIG. 7A, the ice making speed can be reduced by supplying electricity to the ice tray 11 only for a certain period of time after water is supplied, and turning off the heating element halfway.
[0034]
As shown in FIG. 7 (b), the method is controlled by the elapsed time after the start of the ice making, or as shown in FIG. 7 (c), by the temperature sensor attached to the lower part of the ice making tray. And the control of stopping the energization of the heating element when the temperature reaches the set temperature. In this case, the heating element is turned on during the ice making of the upper part of the ice tray, ie, the transparent ice part, and the heating element is turned off at the time of making the ice in the lower part of the ice tray, ie, the cloudy part. .
[0035]
Further, even when the heating element is turned on, the generation rate of the transparent ice can be further optimized by changing the heat generation amount by changing the duty ratio. The duty ratio control refers to, for example, setting a cycle time of one cycle to 10 s and dividing the interval into ten intervals of 1 s to set the energization time. For example, as shown in FIG. 7D, the heater is a 5 W heater when the duty ratio of the 10 W heater is controlled to 50%.
[0036]
For example, as shown in FIG. 7E, as an example of the optimization control, the input of the heating element may be increased or decreased according to the value of a temperature sensor fixed at the lower part of the ice tray. This makes it possible to cope with sudden temperature fluctuations in the ice making chamber. When optimizing the heater input, the heater rating is determined from the required amount of heat generated by the heater, and when a small input is required, the duty ratio is controlled.
[0037]
The largest heater input is required to melt the ice in the lower part of the formation of the transparent ice, but in order to promote the melting, not only the heater input but also the water supply is performed at the same time to promote the melting and the required capacity of the heating element Can be reduced.
[0038]
Also, as shown in FIG. 7 (f), by turning on this heating element before the ice-releasing operation after the ice-making is completed, the ice particles are slightly separated from the surface of the ice-making tray, so that the ice is easily separated and the shape of the ice is improved. For example, it is possible to remove ice without cracking, chipping or the like of ice made of a design such as rock ice.
[0039]
Further, in the operation panel 22 for adjusting the temperature of the refrigerator compartment installed on the surface of the refrigerator door and the like shown in FIG. Alternatively, by controlling the energization of the heater by selecting normal ice, it is also possible to turn off the heater when normal ice is generated to achieve compatibility with fast ice.
[0040]
Next, a method of cleaning the ice tray will be described with reference to the flowchart of FIG. On the operation panel 22, the ice tray cleaning mode SW may be set. As shown in FIG. 2, in the automatic ice maker, the microcomputer 24 in the control board 23 is connected to the operation panel 22, and the number of times of ice making is stored in a storage device such as the microcomputer 24. When a certain number of times is reached, a command is sent from the microcomputer 24 to the operation unit to turn on the LED 25. The end user operates the cleaning SW in the operation panel 22 to forcibly turn on the heating element below the ice tray to melt the ice, and then rotate the ice tray to drain the water. Is provided. As a result, even if impurities and the like remain in the lower portion of the two layers of the ice tray, it can be cleaned and kept clean forever.
[0041]
Further, by adding an antibacterial agent to components such as an ice tray, the propagation of various germs can be prevented.
[0042]
Embodiment 5 FIG.
FIG. 9 shows the fifth embodiment, and is a perspective view of an ice tray. In the first to fourth embodiments, the white turbid portion separated by the separator shape 16 is melted and mixed with the supplied water to eliminate the wastewater treatment. In the fifth embodiment, the ice tray is It has both a two-layer grain-shaped part and a one-layer grain-shaped part, and can produce both transparent ice and ordinary ice at the same time.
[0043]
Also, in this case, by connecting the two-layer grain-shaped part and the one-layer grain-shaped part at the bottom of the ice tray, the ice in the cloudy part can be concentrated on a part of the ice tray, and drainage is unnecessary. System is realized.
[0044]
For example, in 10 ice trays, the separator shape 16 described in the first to fourth embodiments is provided for eight particles, and the separator shape 16 is not provided for the remaining two particles. The first water supply produces 8 clear ice cubes and 2 regular ice cubes. Then, at the same time as the water supply, the turbid portion is melted by a heater installed below the eight grains. Then, the lower surface of the ice tray is tilted at least 7 degrees toward the remaining two grains, and the melted water is flown and concentrated, and then water is supplied to produce eight transparent ice grains and two normal ice grains again. .
[0045]
By concentrating the cloudy components, the transparency of the other eight grains can be increased stably, and the ionic components that tend to accumulate below are concentrated to produce mineral-rich ice at the same time as clear ice. can do.
[0046]
At this time, if a partition shape is provided at the boundary between the position of the transparent ice and the position of the normal ice in the case where the ice falls and stores the ice, the ice is automatically separated and the usability is good.
[0047]
【The invention's effect】
The refrigerator according to the present invention is provided with a separate shape for dividing ice particles into upper and lower portions while leaving a connecting portion in each grain shape of the ice tray, and moving the cloudy portion to the lower portion of the ice tray by cooling from above. After clear ice is generated, the connection is cut off in the ice release process after the ice making is completed, the clear ice is released, the remaining cloudy ice is melted and mixed with the water supplied to the ice tray, and then mixed again. By providing an ice making device for making ice, a mechanism for removing the remaining ice into a drain or the like is not required, and it can be realized at low cost with components that generate less highly transparent ice.
[Brief description of the drawings]
FIG. 1 is a view showing a first embodiment and is an explanatory view of a configuration of a refrigerator.
FIG. 2 shows the first embodiment and is an explanatory diagram of an ice making system.
FIG. 3 shows the first embodiment and is an explanatory diagram of an ice tray structure.
FIG. 4 is a view showing the second embodiment and is a view showing a method of forming an ice tray integrated with a separator by a gas injection method.
FIG. 5 is a view showing the second embodiment, and is a view showing a method of forming an ice tray by a die slide method.
FIG. 6 shows the third embodiment and is a view showing the configuration of an ice tray.
FIG. 7 is a diagram illustrating a heating element control according to the fourth embodiment.
FIG. 8 is a flowchart showing a method for cleaning an ice tray according to the fourth embodiment.
FIG. 9 shows the fifth embodiment and is a perspective view of an ice tray.
[Explanation of symbols]
1 Refrigerator body, 2 fans, 3 coolers, 4 cool air ventilation duct, 5 return duct, 6 temperature sensor, 7 air volume controller, 8 water tank, 9 water pump, 10 water pipe, 11 ice tray, 12 ice making device, 13 frame body, 14 ice making thermistor, 15 ice detecting lever, 16 separator shape, 17 transparent ice portion, 18 white muddy ice portion, 19 hole shape, 20 code heater, 21 aluminum foil, 22 operation panel, 23 control board, 24 microcomputer, 25 LED, 100 refrigeration room, 200 freezer room, 300 vegetable room, 400 switching room, 500 ice making room.

Claims (35)

Within each grain shape of the ice tray, a separate shape is provided to divide the ice grains up and down leaving the connecting part, and the cloudy part is moved to the lower part of the ice tray by cooling from above to generate transparent ice at the top, An ice making device that cuts the connecting portion in the ice removing process after completion of ice making, separates the clear ice, melts and mixes the remaining cloudy ice with water supplied to a new ice tray, and then makes ice again. A refrigerator comprising: 2. The refrigerator according to claim 1, wherein the separate opening that forms the connection part of the ice particles has a hole shape corresponding to a circle having a diameter of 2 to 5 mm. 3. 2. The refrigerator according to claim 1, wherein a plurality of the separate openings that form the connection part of the ice particles are symmetrically arranged at a constant pitch. 3. The refrigerator according to claim 1, wherein the separate shape has a depth from the bottom of the ice tray that secures a volume of 5 to 30% of the volume of ice particles. 2. The refrigerator according to claim 1, wherein an ice particle-shaped portion of the ice tray is divided into two layers. 2. The refrigerator according to claim 1, wherein an opening area of the cold air duct above and below the ice tray is made larger than below the ice tray, and cooling is performed from above. 3. 2. The refrigerator according to claim 1, wherein cooling is performed from above the ice tray by adjusting an opening angle of an air volume adjuster provided in the cool air duct to change a wind direction. 3. The refrigerator according to claim 5, wherein the two-layer structure of the ice tray is constituted by one part. The above-mentioned ice tray is a gas injection method in which a resin is filled in a mold ice tray shape, and a gas is injected from a gas filling nozzle provided in each grain shape into a semi-closed space under the ice tray to form a hollow shape. The refrigerator according to claim 8, wherein the refrigerator is formed by: The ice tray is formed by dividing an unmoldable shape by undercut into a plurality of parts, dividing the plurality of parts into a resin at the same time by primary molding, and then sliding the movable mold in the same mold. 9. The refrigerator according to claim 8, wherein after the shapes of the plurality of parts are combined, a secondary molding is performed on the connecting part and the parts are connected by a die slide method. The refrigerator according to claim 10, wherein a polypropylene resin is used as the resin. The refrigerator according to claim 1, wherein a lower temperature of the ice tray is higher than an upper temperature. The refrigerator according to claim 12, wherein a heating element is provided below the ice tray. The refrigerator according to claim 13, wherein a heating element is provided on a bottom surface or a lower portion of a side surface of the ice tray. 14. The refrigerator according to claim 13, wherein the heating element is a flexible heater wire that withstands the twisting operation of the ice tray. The refrigerator according to claim 15, wherein the heating element has a structure in which a nichrome wire is wound around a core wire and covered with an insulating coating. 17. The refrigerator according to claim 16, wherein the insulating coating is made of vinyl chloride, fluorine resin, or silicon resin. The refrigerator according to claim 15, wherein the heating element has a configuration in which a cord heater coated with PVC is covered with aluminum foil. The refrigerator according to claim 15, wherein the heater wire is formed in a sheet shape in which a heating wire is embedded. 16. The refrigerator according to claim 15, wherein a small heating element in which a resistor is embedded is individually installed below each ice particle of the ice tray. 16. The heating element according to claim 15, wherein the heating element is attached to an ice tray with an aluminum tape or the like having an adhesive material, and the heating element is fixed to the ice tray using a fall prevention cover for preventing peeling or the like. refrigerator. The refrigerator according to claim 15, wherein an insulator that secures an insulation distance is interposed between the heating element and the ice tray. The refrigerator according to claim 15, wherein the amount of heat of the heating element is controlled at the time of ice making or at the time of ice separation. 24. The refrigerator according to claim 23, wherein electricity is supplied to the ice tray only for a set time after water is supplied, and the heating element is turned off halfway. 25. The refrigerator according to claim 24, wherein the temperature of the lower portion of the ice tray is measured by a temperature sensor attached to a lower portion of the ice tray, and when the temperature reaches a set temperature, the power supply to the heating element is stopped. The heating element is turned on during the ice making of the transparent ice part which is the upper part of the ice tray, and the heating element is turned off when making the cloudy part which is the lower part of the ice tray. A refrigerator according to claim 24. 25. The refrigerator according to claim 23, wherein the heat generation amount is changed by changing a duty ratio of the heating element to perform optimization control. The refrigerator according to claim 27, wherein a heating element input is increased or decreased according to a value of a temperature sensor fixed to a lower portion of the ice tray. 14. The refrigerator according to claim 13, wherein, when melting the cloudy ice in the lower layer, the heating element is turned on and water is supplied at the same time. 14. The refrigerator according to claim 13, wherein the heating element is turned on before the ice releasing operation after the ice making is completed. An operation panel for adjusting the temperature of the refrigerator compartment installed on the surface of the refrigerator door or the like is provided, and a user selects transparent ice or normal ice by a changeover switch provided on the operation panel. 14. The refrigerator according to claim 13, wherein the refrigerator is controlled. An operation panel for adjusting the temperature of the refrigerator compartment installed on the surface of the refrigerator door or the like is provided, and a cleaning mode switch for an ice tray is set on the operation panel, and when the number of times of ice making reaches a predetermined value, it is displayed on the operation panel. The user operates the cleaning switch to forcibly turn on the heating element below the ice tray to melt the ice, and then rotate the ice tray to drain water. Refrigerator. 6. The refrigerator according to claim 5, wherein the ice tray has at least one ice-particle-shaped portion that is not partitioned into two layers, and generates transparent ice and normal ice simultaneously. 34. The refrigerator according to claim 33, wherein the two-layered ice particle-shaped portion and the one-layered ice particle-shaped portion are connected at the bottom of the ice tray. 35. The refrigerator according to claim 34, wherein the lower surface of the ice tray is inclined at least 7 degrees or more toward the one-layer ice particle-shaped portion.

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