JP2892202B2 - Ice storage device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ice heat storage device used for an air conditioner or the like.

[0002]

2. Description of the Related Art An air conditioning system having an ice heat storage device is used to reduce the power demand for cooling which is concentrated in the daytime.
Since inexpensive late-night power can be used and contract power can be reduced by halving the capacity of heat source equipment, application to relatively large-capacity air conditioning systems such as building air conditioning and district cooling and heating systems is expected. Ice heat storage devices are roughly classified into an indirect heat exchange method and a direct heat exchange method in the method of producing ice.In the indirect heat exchange method, a heat transfer tube for ice making is used. A refrigerant (Freon, etc.) or antifreeze (brine) is allowed to flow to generate ice on the wall opposite to the heat transfer tube, and to accumulate ice.
Refrigerant gas is blown directly into the water.

In the direct heat exchange system, a low-temperature refrigerant blown out of an expansion valve in a refrigerator is blown into water in a water tank, and the latent heat generated when the refrigerant evaporates turns the water into ice. The temperature of the cooling liquid (refrigerant) can be increased in comparison with the temperature coefficient of the refrigerating machine, and the heat transfer by direct contact between the refrigerant and the water in the water tank results in a heat transfer tube. It is not necessary to arrange ice filling rate (I
PF) is also known to be good. However, in the direct heat exchange method, the water mixed in the refrigerant vapor freezes at the expansion valve and causes a malfunction of the expansion valve. Therefore, it is necessary to attach a water separator to the vapor passage. Of lubricating oil may be mixed into water and adversely affect heat storage.

[0004] In order to solve such problems, for example, the 24th Japan Heat Transfer Symposium Proceedings (19)
May, 1987) “Research on Ice Thermal Storage System Using Direct Contact Heat Transfer of Refrigerant”, ice thermal storage is generated in a closed container isolated from the cold heat transfer system to store heat. Although there is a technical means to do this, this method requires that the heat storage tank be a closed structure, and that the generation and storage of ice must be performed in one tank, and the ice filling rate in the tank is limited. Therefore, the tank must be enlarged and the tank must be designed as a pressure vessel.

As means for solving the above problems, there are known technical means disclosed in JP-A-1-244225 and JP-A-2-97845. As shown in FIG. 12, the above technical means separates the ice maker 1 and the heat storage tank 2, stores the water-insoluble high-density antifreeze 3 in the ice maker 1, stores the water 4 in the heat storage tank 2, The portion above the liquid surface 3a of the water-insoluble high specific gravity antifreeze 3 and the portion above the water surface 4a of the heat storage tank 2 are connected by a pipe 5, and the portion above the liquid surface 3a of the ice maker 1 and the heat storage tank 2 And a branch pipe 8 branched from the water circulating pump 7 on the downstream side of the pipe 6.
Is connected to the bottom of the ice maker 1 and the antifreeze 3
Is cooled by a refrigeration cycle 12 including a refrigerator 9, an antifreeze circulating pump 10, and a heat exchanger 11, and water in the heat storage tank 2 is jetted into the cooled antifreeze of the ice maker 1 via the branch pipe 8. Then, water is brought into direct contact with the cooling antifreeze to precipitate ice, ice lighter than the antifreeze is floated to the water 4 above the antifreeze, and the precipitated ice 13 is passed through the pipe 5 from the water surface 4a of the heat storage tank 2 through the pipe 5. The ice layer 14 is stored at an upper position.

[0006]

In the technical means of the above type, there is a temperature difference between the water-insoluble high-density antifreeze and the water located thereabove, and the interface between the water-insoluble high-density antifreeze and the water is reduced. The ice formed in the water-insoluble high-density antifreeze does not rise in water, and when ice containing the water-insoluble high-density antifreeze is generated in the ice, the water-insoluble high-density antifreeze is generated. Ice that does not float on water accumulates at the interface between the antifreeze and water, preventing continuous ice making.In addition, in order to efficiently exchange heat between the water-insoluble high-density antifreeze and water, the water-insoluble high-density antifreeze storage is required. It is necessary to increase the height of the section, and there is a problem that a large amount of the non-water-soluble high-density antifreeze contained in the ice maker is required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has a miniaturized ice maker by minimizing the amount of a water-insoluble high-density antifreeze, and heat exchange between the water-insoluble high-density antifreeze and water. It is an object of the present invention to provide an ice heat storage device that performs the operation efficiently.

[0008]

The ice heat storage device of the present invention comprises:
An ice maker containing water and a non-water-soluble refrigerant having a specific gravity greater than water, a heat storage water tank connected to the ice maker via a communication portion, and water above the liquid level of the non-water-soluble refrigerant inside the ice maker. A jet nozzle which is disposed in the nozzle and injects the water-insoluble refrigerant upward, and a water-insoluble refrigerant which is cooled by cooling the water-insoluble refrigerant accommodated in the ice maker to a temperature of 0 ° C. or less and directs upward from the jet nozzle. A refrigeration cycle for spraying ice to deposit ice, a pipe connecting a portion of the side wall of the ice maker above the refrigerant level and a lower part of the side wall of the heat storage water tank, and a water pump disposed on the pipe, and the ice maker has a A water circulating device that forms a flow of water toward the heat storage water tank and sends ice precipitated by the cooled water-insoluble refrigerant and floating upward to the heat storage water tank through the communication portion.

The ice heat storage device of the present invention also includes an ice maker containing water and a water-insoluble refrigerant having a specific gravity higher than that of water, a heat storage water tank disposed adjacent to the ice maker, and a heat storage water tank of the ice maker. A water flow drop tank provided at a position higher than the heat storage water tank on the opposite side, an inclined flow path portion connecting the water flow fall tank and the heat storage water tank and guiding the water of the water flow fall tank to the heat storage water tank as a layer, and formed in the inclined flow path section Refrigerant outlet and the refrigerant provided in the ice maker
And a refrigeration cycle in which ice is deposited by directly injecting the cooled refrigerant cooled to a temperature of not more than ° C from the refrigerant outlet into the water flowing in a layered manner in the inclined flow path portion.

[0010]

[0011]

In the ice heat storage device of the present invention, a water-insoluble refrigerant having a higher specific gravity than water provided in an ice maker is cooled to 0 ° C. by a refrigeration cycle.
Cooled to the temperature below, the cooled refrigerant is injected into the water contained in the ice maker from the ejection nozzle arranged inside the ice maker, the cooling refrigerant is brought into direct contact with the water, and the ice precipitated from the water is removed. Float the water and store the floating ice in a thermal storage tank.

Further, in the ice heat storage device of the present invention, a water-insoluble refrigerant having a higher specific gravity than water provided in the ice maker is cooled to a temperature of 0 ° C. or less by a refrigeration cycle, and the cooled refrigerant is supplied to the inclined flow path. Ice is deposited from the formed refrigerant outlet, and ice is precipitated by directly injecting the cooling refrigerant from the refrigerant outlet into the water flowing in a layered manner in the inclined flow path part, and the precipitated ice is passed through the inclined flow path part. Guided to the thermal storage tank with flowing water,
Store ice in a thermal storage tank.

[0013]

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
FIG. 1 shows an entire configuration of an ice heat storage device according to the present invention. A refrigerant storage portion 23 for containing a non-water-soluble refrigerant 22 having a higher specific gravity than water is formed at a bottom portion 21 of an ice maker 20 of the ice heat storage device. I have. The refrigerant reservoir 23 is connected to the lower end of the side wall 24 of the ice maker 20 by an inclined surface 25 inclined upward,
The water-insoluble refrigerant 22 spouted into the water of the ice maker 20 and descending in the water is dropped on the inclined surface 25, and the dropped refrigerant 22
Is guided to the refrigerant reservoir 23 along the inclined surface 25. The jet nozzle 26 disposed at a position higher than the refrigerant liquid level 22a inside the ice maker 20 is shown in FIGS.
As shown in FIG. 2, the ice maker 20 is arranged so as to extend in the horizontal direction adjacent to the side wall 24. Nozzle part 26a
Are arranged at intervals in the longitudinal direction of the ejection nozzle 26 as shown in FIG. The jet nozzle 26 is
The refrigerant 22 cooled to a temperature of 0 ° C. or lower is discharged from the ejection nozzle 26 by a refrigerator 29 and a circulating pump 30 which are connected to a refrigerant reservoir 23 by a refrigerant pipe 28 and constitute a refrigeration cycle arranged in the refrigerant pipe 28. Injects obliquely upward from the nozzle portion 26a.

On the other hand, a heat storage water tank 31 arranged adjacent to the ice maker 20 is connected to the ice maker 20 via a communication part 32 also serving as a water flow guide part. The lower part of the side wall 33 of the heat storage water tank 31 and a portion above the ejection nozzle 26 of the ice maker 20 are connected by a pipe 34, and the water 36 stored in the heat storage water tank 31 is made by the water circulating pump 35 provided in the pipe 34. To the vessel 20.

The water-insoluble refrigerant 22, which has a higher specific gravity than water, has a specific weight of 1.7 to 1.8 times that of water and a freezing point of-
A florinate solution of about 50 ° C. is selected. The florinate liquid is a colorless, transparent, odorless, and inert liquid, has a completely fluorinated structure, and is a bond of only carbon atoms C and fluorine atoms F. The boiling point and the freezing point (the same as the pour point) of the Fluorinert liquid 12 differ depending on the number of bonds between the carbon atoms C and the fluorine atoms F, but most of them have a freezing point of −20 ° C. or less. Also, the specific weight is 1.7 to 1.8 kg / l at about 0 ° C., which is about twice that of ice, and the solubility of water in fluorinert is as low as 7.2 ppm at a temperature of 10 ° C. When there is no problem, when water and florinate are put together in the water tank, they are completely separated from each other, florinate is settled to the bottom, and the water floats on it.

The water 3 stored in the heat storage water tank 31
6 forms a circulation path which is sent to the ice maker 20 through the pipe 34 and returns from the ice maker 20 to the heat storage water tank 31 through the communication part 32, and the refrigerant storage part 2 provided at the bottom 21 of the ice maker 20.
The refrigerant 22 of No. 3 passes through a refrigerant pipe 28 and is cooled to 0 ° C. by a refrigerator 29 constituting a refrigeration cycle arranged in the refrigerant pipe 28.
The cooled refrigerant 22 cooled to the following temperature is sent to the ejection nozzle 26 as a forced flow by the circulation pump 30,
It is jetted obliquely upward from the nozzle portion 26 of the jet nozzle 26. Cooling refrigerant 2 injected from nozzle part 26
2 is in direct contact with the water contained in the ice maker 20 to exchange heat, and the water 36 in contact with the cooling refrigerant 22 becomes ice particles 37 and rises in the water. The water is returned to the heat storage water tank 31 via the communicating portion 32 together with the water, and is stored in a layered form on the water surface of the heat storage water tank 31. In this case, the generated ice particles 37 are immediately conveyed to the heat storage water tank 31, so that the ejection nozzle 26 prevents the ice particles 37 from re-adhering around the nozzle portion 26 a of the ejection nozzle 26, and the ejection port of the nozzle portion 26 a Will not freeze and close.
Further, since the refrigerant 22 that has been heat-exchanged with water has water-insolubility having a specific gravity greater than that of water, it is separated from the water, descends in the water of the ice maker 20, and falls on the bottom inclined surface 25. It flows down along the inclined surface 25 and is returned to the refrigerant reservoir 23.

FIG. 5 shows a modification of the present invention. In this modification, the bottom of the heat storage water tank 31 and the ejection nozzle 2 of the ice maker 20 are shown.
6 and a part downstream thereof is connected by a pipe 40, and this pipe 4
With the water pump provided at 0, the ice blocks 37 stagnating in the vicinity of the ejection nozzle 26 are melted, and the ice blocks 37 are returned to the heat storage water tank 31 through the communication section 32 together with the water of the ice maker 20. In addition to preventing the coolant from being hindered, the returned temperature of the coolant is increased by bringing the poured water into contact with the coolant 22, so that heat exchange is performed more efficiently.

The ice heat storage device shown in FIG. 6 includes an ice maker 50 containing a water-insoluble refrigerant 22 having a specific gravity greater than that of water in a refrigerant storage portion 23, and a heat storage water tank 51 disposed adjacent to the ice maker 50. The partition wall 52 provided at one end of the heat storage water tank 5
1 is located above the side wall. The water flow drop tank 53 provided on the other end side of the ice making device 50 is located at a position considerably higher than the partition wall 52, and the water 54 of the water flow drop tank 51 is layered between the water flow drop tank 53 and the partition wall 52. An inclined channel portion 54 to be dropped is provided. The inclined flow passage 54 has a plurality of refrigerant outlets 5 at intervals in the water flow direction.
5 are formed. A refrigerant flow-down tank 56 is disposed upstream of the refrigerant outlet 55 located at the end of the plurality of refrigerant outlets 55, and a refrigerant recovery tank 57 is disposed downstream of the refrigerant outlet 55. The refrigerant outlet 55 and the refrigerant reservoir 23 are connected by a refrigerant pipe 58. The refrigerant pipe 58 includes a refrigerator 29 and a circulation pump 60 that constitute a refrigeration cycle.
Is arranged. The refrigerator 29 cools the refrigerant guided from the refrigerant reservoir 23 to the refrigerant pipe 58 to a temperature of 0 ° C. or less. On the other hand, on the bottom surface of the heat storage water tank 51, a refrigerant recovery unit 61 is provided.
Are formed. The refrigerant recovery unit 61 is located at the lowest position on the bottom surface, and the inclined surface 62 extends from the side wall to the refrigerant recovery unit 61.
It is connected by. The refrigerant recovery section 61 is connected to the refrigerant storage section 23 via a pipe 63 and a pump 64. An opening 65 is formed at the highest portion of the bottom surface of the heat storage water tank 51. This opening 65 is connected to the water flow falling tank 53 via a pipe 66 and a pump 67.

The water stored in the heat storage water tank 51 is supplied to the pipe 66 through the opening 65 provided on the bottom surface of the heat storage water tank 51.
, And is guided to the water flow fall tank 53, and falls from the water flow fall tank 53 with the inclined flow path 54 as a layer. At the same time, the refrigerant 22 in the refrigerant reservoir 23 is cooled to a temperature of 0 ° C. or lower by the refrigerator 29 provided in the refrigerant pipe 58 through the refrigerant pipe 58, and the cooled refrigerant 22 is forcedly flowed by the circulation pump 60. As a result, the water 54 that comes into direct contact with the water flow falling as a layer from the refrigerant outlet 55 and exchanges heat with the water, contacts the cooling refrigerant 22, becomes ice blocks (particles) 57 and hits the partition 52 together with the water flow that falls as a layer, Ice blocks 57 lighter than water are stored in the heat storage water tank 51 together with the water that passes through the partition walls 52. The refrigerant that is heavier than water flows below the water flow that falls as a layer, hits the partition wall 52, flows backward, and is collected in a refrigerant recovery tank 57 provided near the partition wall 52,
The refrigerant is returned from the refrigerant recovery tank 57 to the refrigerant storage section 23 of the ice maker 50. Also, the refrigerant guided to the heat storage water tank 51 over the partition wall 52 is heavier than water, so descends in the water, reaches the bottom surface, reaches the refrigerant recovery unit 61 along the inclined surface 62 of the bottom surface,
From here, it is returned to the refrigerant reservoir 23 via the pipe 63.
When the inclined surface 62 formed on the bottom surface of the heat storage water tank 51 is coated with a Teflon film, the recovery of the refrigerant is ensured.

FIG. 7 shows a modification of the embodiment shown in FIG. 6. In this modification, the inclination angle of the inclined flow passage 54 is made variable by an actuator (not shown) in accordance with the speed of the water flow.
Further, a semicircular convex portion or a rectangular shape 68 is provided between the refrigerant outlets 55 on the upper surface of the inclined flow passage portion 54 so as to have a corrugated or stepped shape, and the heat exchange area is increased by increasing the contact area between water and the refrigerant. Improving efficiency. In addition, by arranging the heater 69 in the inclined flow passage 54, it is possible to control the temperature of the refrigerant. With this configuration, the precipitated ice is
Since it flows down at the generation stage, there is no icing near the nozzle, and ice can be efficiently filled.

The ice heat storage device shown in FIG. 8 includes an ice making tank 71 containing a water-insoluble refrigerant 22 having a specific gravity greater than that of water in a refrigerant storage section 70, and a heat storage water tank 72 arranged adjacent to the ice making tank 71. The lower surface of the storage unit 70 is connected by an inclined surface 73 that is inclined upward to the lower end of the side wall of the ice making tank 71,
The first water-insoluble refrigerant 22 descending in the water is guided to the refrigerant reservoir 70 along the inclined surface 73. In the water of the ice making tank 71, ejection nozzles 74, 74 are arranged so as to extend in the horizontal direction. As shown in FIG. 9, these two ejection nozzles 74 are arranged in parallel so that the nozzle portions 74a face each other along the side wall of the ice making tank 71.
Further, as shown in FIG. 9, an ice collecting device 75 is arranged at the upper central portion of the ice making tank 71 so as to extend in the direction of the heat storage water tank 72. The ice collecting device 75 sends the ice crystals 76 generated in the water of the ice making tank 71 together with the water to the heat storage water tank 72 disposed adjacently. If an ice collecting flow-down groove is provided on the upper surface of the ice collecting device 75 in a direction perpendicular to the flow direction, the ice collecting efficiency increases and the pump output can be set low.

On the other hand, the jet nozzle 74 is connected to the refrigerant pipe 7.
The refrigerator 29 is connected to the bottom of the refrigerant storage section 70 by a pipe 7 and constitutes a refrigeration cycle disposed in the refrigerant pipe 77.
The circulating pump 30 cools the refrigerant in the refrigerant storage 70 to a temperature of 0 ° C. or lower, and the cooled refrigerant 22 is jetted horizontally from the nozzle 74 a of the jet nozzle 74. The refrigerant recovery portion 78 formed on the bottom surface of the heat storage water tank 72 is located at the lowest position on the bottom surface, and is continuous from the side wall to the refrigerant recovery portion 78 on an inclined surface 79. The refrigerant recovery unit 78 is connected to the refrigerant storage unit 70 via a pipe 80 and a pump 81. An opening 82 formed at the highest portion of the bottom surface of the heat storage water tank 51 is connected to a circulating water supply port 85 via a pipe 83 and a pump 84. In FIG. 8, reference numeral 86 denotes a refrigerant return pipe, and 87 denotes a weir for efficiently transmitting the generated ice crystals 76 to the heat storage water tank 72.

The refrigerant 22 in the refrigerant reservoir 70 provided in the ice making tank 71 passes through the refrigerant pipe 77 and passes through the refrigerant pipe 77.
0 by the refrigerator 29 constituting the refrigeration cycle
The cooled refrigerant 22 cooled to a temperature of not more than ° C. is sent to the ejection nozzle 74 as a forced flow by the circulation pump 30, and is ejected horizontally from the nozzle portion 74 a of the ejection nozzle 74. Cooling refrigerant 2 injected from nozzle part 74a
2 is in direct contact with the water in the ice-making tank 71 and exchanges heat, and the water in contact with the cooling refrigerant 22 becomes ice blocks (particles) 76. Since the ice blocks (grains) 76 are lighter than water, they rise in the water as shown in FIG. 9, and the ice blocks 37 that have risen in the water are collected in the ice collecting device 75 and sent to the heat storage water tank 72 arranged adjacently with the water. .

On the other hand, the cooling refrigerant 22 jetted from the jet nozzle 74 has a non-water solubility which is heavier than water.
Separate from the water and descend in the water, fall on the bottom slope 73,
It flows down along the bottom inclined surface 25 and is returned to the refrigerant reservoir 70. The refrigerant 22 guided to the ice collecting device 75 is supplied to the weir 8
7 and is returned to the refrigerant reservoir 70 via the refrigerant return pipe 86 and the bottom inclined surface 73.

In a modified example of the present invention shown in FIG. 10, a heater 91 is provided at a refrigerant outlet 90 provided on the outer wall of an ice making tank 71 to prevent the inside of the ice making tank 71 from freezing and to provide a circulating water supply port. The convection of water is increased by making the supply angle of 92 a diagonally upward direction so that the coolant and the water are brought into contact with each other. The channel 94 of the ice collecting device 93 has a semicircular or V-shaped cross section. Thus, icing of the floating ice blocks (grains) 76 is prevented.

In a modification of the present invention shown in FIG. 11, ice is collected by connecting an ice collecting device 75 provided in an ice making tank 71 and a heat storage water tank 72 by a transfer duct 100 having an inclination angle of 5 to 20 degrees. The ice blocks 76 are sent to the heat storage water tank 72 together with water by the action of gravity without using power means.

[0028]

According to the invention of claim 1 of the present application, ice is precipitated by injecting a cooling refrigerant upward from a jet nozzle disposed inside the ice maker into water contained in the ice maker, By adopting a configuration in which ice that precipitates and floats is immediately transported together with water to the heat storage tank, the occurrence of icing at the interface between ice and water can be prevented, and the structure of the icemaker can be reduced in size. The invention according to claim 2 of the present application is directed to depositing ice by directly injecting the cooling refrigerant from the refrigerant outlet into the water flowing in a layered manner in the inclined flow path portion, and separating the deposited ice into water flowing through the inclined flow path portion. In addition, by adopting a configuration in which the ice is guided to the heat storage water tank, ice does not stay inside the ice maker, the ice filling rate is improved, and the structure of the ice maker can be downsized.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of an ice heat storage device according to the present invention.

FIG. 2 is a sectional view of an ice maker of the ice heat storage device.

FIG. 3 is a cross-sectional view of a jet nozzle portion provided in the ice maker.

FIG. 4 is a sectional view taken along line 4-4 in FIG. 3;

FIG. 5 is a diagram showing a modification of the first embodiment of the ice heat storage device according to the present invention.

FIG. 6 is a view showing a second embodiment of the ice heat storage device according to the present invention.

FIG. 7 is a diagram showing a modification of the first embodiment of the ice heat storage device according to the present invention.

FIG. 8 is a diagram showing a third embodiment of the ice heat storage device according to the present invention.

FIG. 9 is a sectional view of an ice making tank of the ice heat storage device.

FIG. 10 is a view showing a modification of the third embodiment of the ice heat storage device according to the present invention.

FIG. 11 is a view showing a modification of the third embodiment of the ice heat storage device according to the present invention.

FIG. 12 is a diagram showing a conventional ice heat storage device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 Ice maker 22 Refrigerant 22a Refrigerant liquid level 26 Injection nozzle 29 Refrigerator 31 Heat storage water tank 32 Communication part 34 Pipe 35 Water pump 50 Ice maker 51 Heat storage water tank 53 Water flow fall tank 54 Inclined flow path part 55 Refrigerant outlet 70 Ice maker 72 Heat storage Water tank 74 Spout nozzle 75 Ice collector

────────────────────────────────────────────────── (5) References JP-A-3-140767 (JP, A) JP-A-64-38578 (JP, A) JP-A-48-47158 (JP, A) (58) Survey Field (Int.Cl. ⁶ , DB name) F24C 1/00 F24F 1/00 102

Claims (2)

(57) [Claims] An ice maker containing water and a water-insoluble refrigerant having a specific gravity higher than that of water, a heat storage water tank connected to the ice maker via a communicating portion, and a liquid of the water-insoluble refrigerant inside the ice maker. A jet nozzle that is disposed in water above the surface and jets the water-insoluble refrigerant upward, and jets the cooled water-insoluble refrigerant by cooling the water-insoluble refrigerant contained in the ice maker to a temperature of 0 ° C or less. A refrigeration cycle in which ice is deposited by spraying upward from the nozzle, a pipe connecting a portion of the side wall of the ice maker above the coolant level and a lower part of the side wall of the heat storage water tank, and a water pump arranged in this pipe. An ice heat storage device comprising: a water circulating device that forms a flow of water from an ice maker to a heat storage water tank, and sends ice that is precipitated by a cooled non-water-soluble refrigerant and floats upward to a heat storage water tank through a communication portion. 2. An ice maker containing water and a water-insoluble refrigerant having a higher specific gravity than water, a heat storage water tank disposed adjacent to the ice maker, and a position higher than the heat storage water tank on the opposite side of the heat storage water tank of the ice maker. A water flow drop tank provided in the inclined flow path portion that connects the water flow fall tank and the heat storage water tank and guides the water in the water flow fall tank to the heat storage water tank in a layered manner, a refrigerant outlet formed in the inclined flow path section,
An ice heat storage device having a refrigeration cycle that cools a refrigerant provided in an ice maker to a temperature of 0 ° C. or less and directly injects the cooled refrigerant from a refrigerant outlet to water flowing in a layered manner in a slanted flow path to deposit ice.